A tension test method, system, terminal and storage medium of a pulley assembly

Abstract

The application relates to a tension test method and system of a pulley assembly, a terminal and a storage medium, and relates to the technical field of pulley testing. The method comprises the following steps: obtaining a test item of a pulley assembly; the tension test device comprises a horizontally arranged base, an oil cylinder and a transmission assembly; the oil cylinder is arranged at a first end of the base; a first end of the transmission assembly is fixed to a push rod of the oil cylinder; a second end of the transmission assembly is connected to a first end of the pulley assembly through a first connecting piece; a second end of the pulley assembly is connected to a second connecting piece fixed to a second end of the base; the push-out direction of the push rod is away from the pulley assembly; according to the test item, an operation scheme and a completion condition of the oil cylinder are set; the oil cylinder is controlled to work according to the operation scheme; a stress curve on the transmission assembly is generated; and according to the stress curve, a test result of the pulley assembly is obtained under the condition that the completion condition is met. The application has the effect of improving the test of the pulley assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulley testing, in particular to a tension test method and system for a pulley assembly, a terminal and a storage medium. BACKGROUND

[0002] The pulley is an indispensable simple machine in modern engineering machinery, which can be applied in various engineering equipment and has high safety requirements. Therefore, tension test for the pulley or pulley assembly is an essential link.

[0003] The related technology uses a tension testing machine to perform tension test, which needs to fix the pulley assembly on the tension testing machine. The tension testing machine is started to pull one end of the pulley assembly, while the other end of the pulley assembly is fixed. The applied tension of the tension testing machine is gradually increased until the pulley assembly fails or the applied tension reaches a preset safety limit, and the applied tension of the tension testing machine at this time is recorded as the tension test result.

[0004] For the related technology in the above, the tension testing machine can provide relatively limited tension, and the test effect is poor for high-strength pulley assemblies. SUMMARY

[0005] In order to improve the test effect of the pulley assembly, the present application provides a tension test method, system, terminal and storage medium for a pulley assembly.

[0006] In a first aspect, the present application provides a tension test method for a pulley assembly, which adopts the following technical solution:

[0007] A tension test method for a pulley assembly, comprising:

[0008] In response to detecting that the pulley assembly is set on a tension test device, obtaining a test item of the pulley assembly, the tension test device comprising a horizontally arranged base, an oil cylinder and a transmission assembly, the oil cylinder being arranged at a first end of the base, a first end of the transmission assembly being fixed to a push rod of the oil cylinder, a second end of the transmission assembly being connected to a first end of the pulley assembly through a first connecting piece, a second end of the pulley assembly being connected to a second connecting piece fixed to a second end of the base, and a pushing direction of the push rod being away from the pulley assembly;

[0009] According to the test item, setting an operation scheme and a completion condition of the oil cylinder;

[0010] Controlling the oil cylinder to work according to the operation scheme;

[0011] Generating a stress curve on the transmission assembly;

[0012] When the completion condition is met, a test result of the pulley assembly is obtained according to the force curve.

[0013] By adopting the technical scheme, the tension test device is used to test the tension of the pulley assembly, and the test result is obtained. Since the pushing direction of the oil cylinder push rod in the tension test device is away from the pulley assembly, the oil cylinder can provide more thrust, which can adapt to the tension test requirements in various scenes, thereby improving the test effect of the pulley assembly.

[0014] Optionally, during the working of the oil cylinder according to the operation scheme, a current force value on the transmission assembly is obtained, the operation scheme is that the output power of the oil cylinder is uniformly increased, and the current force value corresponds to a current timestamp;

[0015] According to a previous timestamp of the current timestamp, a historical force value is obtained;

[0016] A difference between the current force value and the historical force value is calculated to obtain a force value difference;

[0017] It is judged whether the force value difference is greater than a preset difference threshold;

[0018] If yes, the current force value is recorded, and the oil cylinder is controlled to stop working;

[0019] If no, the step of controlling the oil cylinder to work according to the operation scheme is executed.

[0020] By adopting the technical scheme, the force value on the rotating assembly can be recorded in real time during the working of the oil cylinder according to the operation scheme, and whether the oil cylinder works or not is determined according to the difference between the current force value and the historical force value, and then whether the tension test device matches the completion condition is determined according to the current force value.

[0021] Optionally, a pressure value on the base is monitored;

[0022] According to the weight of the pulley assembly, a gravity value of the pulley assembly is obtained;

[0023] A difference between the pressure value and the gravity value is calculated to obtain a pressure difference value;

[0024] A ratio between the pressure difference value and the current force value is calculated to obtain a first conversion coefficient;

[0025] A second conversion coefficient is generated according to the first conversion coefficient;

[0026] A product of the second conversion coefficient and the current force value is used to update the current force value.

[0027] By adopting the technical scheme, the first conversion coefficient can be calculated by using the ratio of the pressure difference value and the current stress value, the second conversion coefficient can be calculated by using the first conversion coefficient, and the current stress value can be updated by using the product of the second conversion coefficient and the current stress value. The technical scheme makes the current stress value more accurate, and is beneficial to obtaining more accurate test results.

[0028] Optionally, in a case where the pressure value is greater than the preset upper limit of pressure and the direction of the pressure value is vertically downward, the attitude information of the pulley assembly is acquired;

[0029] In a case where the attitude information corresponds to a first attitude, the step of controlling the oil cylinder to work according to the operation scheme is stopped, and the first attitude indicates that the contact area of the pulley assembly and the base is greater than a preset area threshold;

[0030] In a case where the attitude information corresponds to a second attitude, the contact position of the pulley assembly and the base is determined according to the attitude information, and the second attitude indicates that the contact area of the pulley assembly is less than the preset area threshold;

[0031] The attitude of the pulley assembly is adjusted according to the contact position.

[0032] By adopting the technical scheme, in a case where the pressure value is greater than the preset upper limit of pressure and the direction of the pressure value is vertically downward, different schemes are executed according to different attitude information of the pulley assembly to ensure the accuracy of the test results.

[0033] Optionally, the current power of the oil cylinder is acquired;

[0034] The sum of the current power and a preset difference power is calculated to obtain a target power;

[0035] The output power of the oil cylinder is increased at a preset rate until the output power is increased to the target power;

[0036] The area change value of the contact position is monitored;

[0037] If the area change value is greater than a preset change threshold, the step of controlling the oil cylinder to work according to the operation scheme is executed;

[0038] If the area change value is less than the preset change threshold, the oil cylinder is controlled to stop working;

[0039] The height of the pulley assembly is adjusted to release the contact between the pulley assembly and the base.

[0040] By adopting the technical scheme, the area change value of the contact position is detected, the working mode of the oil cylinder is adjusted according to the area change value, the oil cylinder can adjust the posture of the sheave assembly, the sheave assembly is ensured to be tested in a normal state, and the accuracy of the test result is improved.

[0041] Optionally, a force value difference set in a historical period is obtained.

[0042] A peak-to-average ratio of each force value difference in the force value difference set is calculated to obtain a difference peak-to-average ratio.

[0043] It is judged whether the difference peak-to-average ratio is greater than a preset peak-to-average ratio threshold.

[0044] If not, a subsequent step is performed.

[0045] If yes, the position of the sheave assembly is adjusted.

[0046] By adopting the technical scheme, after the force value difference set is obtained, it is judged whether the sheave assembly abnormally shakes by using the difference peak-to-average ratio, and corresponding steps are performed to overcome the abnormal shaking of the sheave assembly, so that the normal operation of the tension test is ensured.

[0047] Optionally, a current position of the sheave assembly is obtained.

[0048] According to the current position, the sheave assembly is controlled to move in a first direction by a first preset distance.

[0049] The force value difference is updated.

[0050] It is judged whether the change amount of the force value difference is greater than a preset change amount threshold.

[0051] If yes, the first direction is updated to a second direction, and the above three steps are repeated.

[0052] If not, the sheave assembly is controlled to move in the first direction by a second preset distance, and the force value difference is recorded to obtain a force value difference set.

[0053] The minimum value in the force value difference set is determined.

[0054] The sheave assembly is arranged at a position corresponding to the minimum value.

[0055] By adopting the technical scheme, the position of the sheave assembly is adjusted, the force value difference set is recorded in the movement process of the sheave assembly, the sheave assembly is arranged at a position corresponding to the minimum value in the force value difference set, the abnormal shaking of the sheave assembly is reduced, and the accuracy of the test result is ensured.

[0056] In a second aspect, the application provides a tension test system for a pulley assembly, which adopts the following technical scheme:

[0057] A tension test system for a pulley assembly comprises:

[0058] An acquisition module is configured to acquire a test item and a stress curve.

[0059] A memory is configured to store a program of a tension test method for the pulley assembly.

[0060] A processor, and the program in the memory can be loaded and executed by the processor to implement the tension test method for the pulley assembly.

[0061] By adopting the above technical scheme, the tension test device is used to test the tension of the pulley assembly, and a test result is obtained. Since the pushing direction of the oil cylinder push rod in the tension test device is away from the pulley assembly, the oil cylinder can provide more pushing force, can adapt to the tension test requirements in various scenarios, and thus improves the test effect of the pulley assembly.

[0062] In a third aspect, the application provides an intelligent terminal, which adopts the following technical scheme:

[0063] An intelligent terminal comprises a memory and a processor, and the memory stores a computer program of the tension test method for the pulley assembly according to any one of the above, which can be loaded and executed by the processor.

[0064] In a fourth aspect, the application provides a computer storage medium, which can store a corresponding program, has the characteristics of facilitating the improvement of the test effect of the pulley assembly, and adopts the following technical scheme:

[0065] A computer readable storage medium stores a computer program of the tension test method for the pulley assembly, which can be loaded and executed by the processor.

[0066] In summary, the application has at least one of the following beneficial technical effects:

[0067] The tension test device is used to test the tension of the pulley assembly, and a test result is obtained. Since the pushing direction of the oil cylinder push rod in the tension test device is away from the pulley assembly, the oil cylinder can provide more pushing force, can adapt to the tension test requirements in various scenarios, and thus improves the test effect of the pulley assembly.

[0068] The force value on the rotating assembly can be recorded in real time during the operation of the oil cylinder according to the operation scheme, and the working of the oil cylinder is determined according to the difference between the current force value and the historical force value, and then the tension test device is determined whether to match the completion condition according to the current force value.

[0069] The first conversion coefficient can be calculated using the ratio of the pressure difference value and the current force value, the second conversion coefficient can be calculated through the first conversion coefficient, and the current force value can be updated using the product of the second conversion coefficient and the current force value. The current force value is more accurate, and a more accurate test result can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0070] Figure 1 is a structural schematic diagram of a tension test device of a pulley assembly provided by an embodiment of the present application.

[0071] Figure 2 is a flowchart of a tension test method of a pulley assembly provided by an embodiment of the present application.

[0072] Figure 3 is a flowchart of an oil cylinder operation control method provided by an embodiment of the present application.

[0073] Figure 4 is a flowchart of a force value updating method provided by an embodiment of the present application.

[0074] Figure 5 is a flowchart of a posture updating method one of a pulley assembly provided by an embodiment of the present application.

[0075] Figure 6 is a flowchart of a posture updating method two of a pulley assembly provided by an embodiment of the present application.

[0076] Figure 7 is a flowchart of a position adjustment method one of a pulley assembly provided by an embodiment of the present application.

[0077] Figure 8 is a flowchart of a position adjustment method two of a pulley assembly provided by an embodiment of the present application.

[0078] Figure 9 is a structural schematic diagram of a tension test system of a pulley assembly provided by an embodiment of the present application. DETAILED DESCRIPTION

[0079] To make the objectives, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments, and it should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. Figure 1 to Figure 9 and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0080] An embodiment of the present application discloses a tension test device of a pulley assembly. Referring to Figure 1The device comprises a transversely arranged base 11, an oil cylinder 12 and a transmission assembly 13. The oil cylinder 12 is arranged at a first end of the base 11. A first end of the transmission assembly 13 is fixed to a push rod 121 of the oil cylinder 12. A second end of the transmission assembly 13 is connected to a first end of a pulley assembly 14 through a first connecting piece 15. A second end of the pulley assembly 14 is connected to a second connecting piece 16 fixed to a second end of the base 11. A pushing direction of the push rod 121 is away from the pulley assembly 14.

[0081] Optionally, the transmission assembly 13 comprises a transmission chain 131 and a transmission shaft 132. One end of the transmission chain 131 is fixed to the push rod 121. The other end of the transmission chain 131 is fixed to the transmission shaft 132. The transmission shaft 132 is further connected to the first connecting piece 15. Figure 1 When the push rod 121 is pushed out along the arrow shown, the pushing force of the push rod 121 is converted into a pulling force on the pulley assembly 14 through the transmission chain 131 and the transmission shaft 132.

[0082] Optionally, a support frame 17 is further arranged at the first end of the base 11. The support frame 17 is located below the oil cylinder 12.

[0083] The embodiment of the present application discloses a pulling force test method of a pulley assembly. Referring to Figure 2 The method comprises the following steps.

[0084] In step S201, in response to detecting that the pulley assembly is arranged on the pulling force test device, a test item of the pulley assembly is acquired. The pulling force test device comprises a transversely arranged base, an oil cylinder and a transmission assembly. The oil cylinder is arranged at a first end of the base. A first end of the transmission assembly is fixed to a push rod of the oil cylinder. A second end of the transmission assembly is connected to a first end of the pulley assembly through a first connecting piece. A second end of the pulley assembly is connected to a second connecting piece fixed to a second end of the base. A pushing direction of the push rod is away from the pulley assembly.

[0085] The pulley assembly refers to a mechanical structure provided with a pulley. Exemplarily, the pulley assembly comprises at least one of a hook group, a movable pulley group, a fixed pulley group, a balance beam and a guide pulley.

[0086] Optionally, in response to receiving a starting operation, it is determined that the pulley assembly is arranged on the pulling force test device. The starting operation is input by a technician.

[0087] Optionally, a camera is installed on the pulling force test device. The camera continuously acquires a region image of an installation region of the pulling force test device. The installation region is a region of the pulling force test device for arranging the pulley assembly. When the pulley assembly is detected in the region image and no employee is detected in the installation region within a preset detection time length, it is determined that the pulley assembly is arranged on the pulling force test device.

[0088] Optionally, the test item includes at least one of rated working tension test, limit breaking tension test, continuous cycle fatigue tension test, impact load tension test, and eccentric load tension test. The test item can be manually input by a technician or automatically generated by the tension test device.

[0089] For example, the tension test device tests the sheave assembly in a certain order, such as rated working tension test-limit breaking tension test-continuous cycle fatigue tension test. When the last test is the limit breaking tension test, the current test is the continuous cycle fatigue tension test. Further, the test result of the last test is obtained, and if the test result is that the test fails, the current test needs to repeat the last test.

[0090] On the other hand, in the tension test device, the oil cylinder applies its own pushing force to the sheave assembly. Due to the structural design of the oil cylinder, it can provide a pushing force significantly greater than the pulling force. Therefore, the tension test device of the present application can provide a larger pulling force to the sheave assembly for testing. The related art is that the oil cylinder directly applies its own pulling force to the sheave assembly. Under the same conditions, the tension test device of the present application can provide a larger range of pulling force and improve the effect of tension test.

[0091] Step S202: According to the test item, set the operation scheme and completion condition of the oil cylinder.

[0092] The operation scheme refers to the operation steps for completing the test item.

[0093] The completion condition refers to the condition or requirement for completing the test item.

[0094] The test item, the operation scheme, and the completion condition are one-to-one corresponding. For example, the test item, the operation scheme, and the completion condition and the mapping relationship therebetween are stored in the database. When the test item is determined, the operation scheme and the completion condition can be retrieved in the database.

[0095] Step S203: Control the oil cylinder to work according to the operation scheme.

[0096] For example, the operation scheme is to increase the output tension of the oil cylinder from 20% of the rated tension of the sheave assembly to 120% of the rated tension of the sheave assembly.

[0097] Step S204: Generate the force curve on the transmission assembly.

[0098] The force curve is used to describe the change of the force value of the transmission assembly with time.

[0099] A force sensor is arranged on the transmission assembly, which can monitor the force value of the transmission assembly. The reading output by the force sensor and the time stamp corresponding to the reading are recorded. A force curve is generated based on the foregoing reading and time stamp.

[0100] Step S205: When the completion condition is met, the test result of the sheave assembly is obtained according to the force curve.

[0101] Optionally, the completion condition refers to that the cylinder does not conform to the preset standard force curve according to the operation scheme or the force curve.

[0102] In some embodiments, the tension testing device is in communication connection with a terminal, and the tension testing device can transmit the related data of the force curve to the terminal, and display the force curve on the display screen of the terminal.

[0103] By adopting the technical scheme, the tension testing device is used to test the tension of the sheave assembly, and the test result is obtained. Since the pushing direction of the oil cylinder push rod in the tension testing device is away from the sheave assembly, the oil cylinder can provide more thrust, which can adapt to the tension testing requirements in various scenes, thereby improving the test effect of the sheave assembly.

[0104] In the following embodiments, during the operation of the cylinder according to the operation scheme, the force value on the transmission assembly needs to be paid attention to, so as to determine whether the sheave assembly reaches the limit. Therefore, the present application discloses a cylinder operation control method. Referring to Figure 3 , the method comprises:

[0105] Step S301: During the operation of the cylinder according to the operation scheme, the current force value on the transmission assembly is obtained, the operation scheme is that the output power of the cylinder is uniformly increased, and the current force value corresponds to a current time stamp.

[0106] The current time stamp represents the generation time of the current force value.

[0107] For example, a force sensor is arranged on the transmission assembly, and the reading of the force sensor is the current force value.

[0108] Step S302: The historical force value is obtained according to the last time stamp of the current time stamp.

[0109] Optionally, the tension testing device stores the generated current force value in the order of the corresponding current time stamp. After the current time stamp is determined, the last continuous time stamp of the current time stamp is taken to obtain the historical force value.

[0110] For example, if the current time stamp does not have the last continuous time stamp, a preset force value is taken as the historical force value, and the value of the preset force value can be set by the technician according to the actual demand.

[0111] Step S303: calculating the difference between the current force value and the historical force value to obtain a force value difference.

[0112] The force value difference is the absolute value of the difference between the current force value and the historical force value.

[0113] Step S304: determining whether the force value difference is greater than a preset difference threshold.

[0114] The preset difference threshold is a preset empirical value, and a technician can adjust the specific value of the preset difference threshold according to actual needs.

[0115] If the force value difference is greater than the preset difference threshold, step S305 is performed.

[0116] If the force value difference is not greater than the preset difference threshold, step S306 is performed.

[0117] Step S305: if yes, recording the current force value and controlling the cylinder to stop working.

[0118] When the force value difference is greater than the preset difference threshold, since the operation scheme is to uniformly increase the output power of the cylinder, the change in the current force value should also be uniform, so the force value difference should be constantly less than the preset difference threshold. In the case of the present step, it is indicated that the pulling force output by the cylinder has exceeded the bearing range of the pulley assembly, and the current force value at this time can be considered as the ultimate breaking pulling force of the pulley assembly.

[0119] Step S306: if no, performing a step of controlling the cylinder to work according to the operation scheme.

[0120] When the force value difference is not greater than the preset difference threshold, it is indicated that the pulling force output by the cylinder has not exceeded the bearing range of the pulley assembly, and is still within the normal range, so the cylinder can continue to work according to the operation scheme.

[0121] By adopting the above technical scheme, the force value on the rotating assembly can be recorded in real time during the working process of the cylinder according to the operation scheme, and the working of the cylinder is determined according to the difference between the current force value and the historical force value, and then whether the pulling force testing device matches the completion condition is determined through the current force value.

[0122] In the following embodiments, because the transmission assembly and the pulley assembly are also communicated through the first connecting member, and the first connecting member usually uses a plurality of steel cables, at this time, the force value read on the transmission assembly cannot well reflect the actual force on the pulley assembly when the plurality of steel cables pull the pulley assembly. Therefore, the present application discloses a force value updating method. Referring to Figure 4 The method comprises:

[0123] Step S401: Monitor the pressure value on the base.

[0124] When performing the tension test, the pulley assembly needs to be placed on the base and the pulley assembly is in contact with the base as much as possible, so that after the pulley assembly is lifted, the pulley assembly is no longer in contact with the base, causing the gravity of the pulley assembly to affect the measurement of the force value.

[0125] Optionally, a pressure sensor is arranged on the base, and the reading of the pressure sensor is taken as the pressure value.

[0126] Step S402: Obtain the gravity value of the pulley assembly according to the weight of the pulley assembly.

[0127] Optionally, the gravity value can be manually input by a technician.

[0128] Optionally, when the pulley assembly is placed on the base, the gravity value of the pulley assembly is obtained based on the reading of the pressure sensor.

[0129] Step S403: Calculate the difference between the pressure value and the gravity value to obtain the pressure difference value.

[0130] The pressure difference value refers to the difference between the pressure value and the gravity value.

[0131] Step S404: Calculate the ratio of the pressure difference value to the current force value to obtain the first conversion coefficient.

[0132] When the pressure difference value appears, it indicates that a part of the force applied by the first connecting member to the pulley assembly is decomposed to the vertical upward direction or the vertical downward direction, resulting in the appearance of the pressure difference value. The pressure difference value is the component force of the force applied by the first connecting member to the pulley assembly in the vertical direction (including the vertical upward direction and the vertical downward direction).

[0133] Step S405: Generate a second conversion coefficient according to the first conversion coefficient.

[0134] For example, let the first conversion coefficient be a and the second conversion coefficient be b, then .

[0135] Step S406: Update the current force value using the product of the second conversion coefficient and the current force value.

[0136] For example, calculate the product of the second conversion coefficient and the current force value, and take the product as the updated current force value.

[0137] By adopting the technical scheme, the first conversion coefficient can be calculated using the ratio of the pressure difference value and the current stress value, the second conversion coefficient can be calculated through the first conversion coefficient, and the current stress value is updated using the product of the second conversion coefficient and the current stress value. The technical scheme makes the current stress value more accurate, which is beneficial to obtaining more accurate test results.

[0138] In the following embodiments, the application discloses a method for updating the posture of a pulley assembly. Referring to Figure 5 , the method comprises:

[0139] Step S501: In a case where the pressure value is greater than a preset upper limit of pressure and the direction of the pressure value is vertically downward, acquiring posture information of the pulley assembly.

[0140] The posture information is used to describe the position and pose of the pulley assembly. Optionally, a camera is arranged on the tension test device, and the real-time image of the pulley assembly can be acquired through the camera. The posture information of the pulley assembly is acquired according to the real-time image.

[0141] The preset upper limit of pressure is a preset empirical value, and a technical person can adjust the specific value of the preset upper limit of pressure according to actual requirements. Optionally, the preset upper limit of pressure is the upper limit of pressure that can be borne by the base, or the preset upper limit of pressure is the upper limit of pressure that can be borne by the pressure sensor.

[0142] In a case where the pressure value is greater than the preset upper limit of pressure and the direction of the pressure value is vertically downward, it is indicated that the pressure applied by the pulley assembly to the base is too large, which can cause damage to the base.

[0143] Step S502: In a case where the posture information corresponds to a first posture, stopping the step of controlling the oil cylinder to work according to the operation scheme, the first posture indicating that the contact area of the pulley assembly with the base is greater than a preset area threshold.

[0144] In a case where the pulley assembly is in the first posture, it is indicated that the pulley assembly is in large-area contact with the base, and the tension applied by the first connecting piece to the pulley assembly presses the pulley assembly on the base, resulting in that the pressure value is greater than the preset upper limit of pressure. At this time, the pressure of the pulley assembly on the base can damage the base or the pressure sensor, and therefore, the step of controlling the oil cylinder to work according to the operation scheme needs to be stopped, so as to stop the pressure applied by the pulley assembly to the base.

[0145] Step S503: In a case where the posture information corresponds to a second posture, determining the contact position of the pulley assembly with the base according to the posture information, the second posture indicating that the contact area of the pulley assembly is less than the preset area threshold.

[0146] In the case that the pulley assembly is in the second posture, it is illustrated that the pulley assembly has a small amount of contact with the base, and the pulling force exerted by the first connecting piece on the pulley assembly does not press the pulley assembly on the base, but a part of the pulley assembly is pressed on the base. There are two cases that lead to this phenomenon, one is that the first connecting piece itself twists, causing the pulling force exerted by the first connecting piece on the pulley assembly to generate a shear force that allows the pulley assembly to rotate. Two, due to the shape of the pulley assembly itself, only a part of the pulley assembly is in contact with the base.

[0147] For example, after obtaining the real-time image captured by the camera, the contact position of the pulley assembly and the base is determined from the real-time image.

[0148] Step S504: Adjust the posture of the pulley assembly according to the contact position.

[0149] The method of adjusting the posture of the pulley assembly can be referred to the subsequent Figure 6 embodiments, which will not be described here.

[0150] By adopting the above technical solution, in the case that the pressure value is greater than the preset upper limit of the pressure and the direction of the pressure value is vertically downward, different schemes are executed according to the posture information of the pulley assembly to ensure the accuracy of the test result.

[0151] Therefore, the embodiment of the application discloses a second posture updating method of a pulley assembly. Referring to Figure 6 , the method comprises:

[0152] Step S601: Obtain the current power of the oil cylinder.

[0153] The current power refers to the output power of the oil cylinder at the current time.

[0154] Step S602: Calculate the sum of the current power and the preset difference power to obtain the target power.

[0155] The preset difference power is a preset empirical value, and the technical personnel can adjust the specific value of the preset difference power according to the actual demand.

[0156] Step S603: Increase the output power of the oil cylinder at a preset rate until the output power increases to the target power.

[0157] The preset rate represents the change amount of the output power of the oil cylinder per unit time, and the preset rate is a preset empirical value, which can be adjusted by the technical personnel according to the actual demand. For example, the preset rate is 20kW / s.

[0158] Step S604: Monitor the area change value of the contact position.

[0159] The real-time image of the pulley assembly is acquired by the camera on the tensile testing device, and the area value of the contact position is acquired from the real-time image. The area change value is obtained according to the change of the area value with time.

[0160] In step S605, if the area change value is greater than the preset change threshold, the step of controlling the oil cylinder to work according to the operation scheme is performed.

[0161] The change threshold is a preset empirical value, and the specific value of the change threshold can be adjusted according to actual needs by the technician.

[0162] When the area change value is greater than the preset change threshold, it is indicated that only a part of the pulley assembly is in contact with the base due to the shape of the pulley assembly itself, so the step of controlling the oil cylinder to work according to the operation scheme can be continued.

[0163] In step S606, if the area change value is less than the preset change threshold, the oil cylinder is controlled to stop working.

[0164] When the area change value is less than the preset change threshold, it is indicated that the first connecting piece is twisted itself, resulting in that the tensile force applied by the first connecting piece on the pulley assembly generates a shear force to make the pulley assembly rotate, and then a pressure value greater than the preset upper limit of the pressure value is generated, and the direction of the pressure value is vertically downward. At this time, the oil cylinder needs to be controlled to stop working to prevent the first connecting piece from continuing to affect the pulley assembly.

[0165] In step S607, the height of the pulley assembly is adjusted to make the pulley assembly and the base out of contact.

[0166] For example, the height of the pulley assembly is increased to increase the distance between the pulley assembly and the base. The real-time image captured by the camera is acquired in real time, and whether the pulley assembly and the base are out of contact is judged according to the real-time image. In the case that the pulley assembly and the base are out of contact, the height of the pulley assembly is stopped increasing.

[0167] Further, after the pulley assembly and the base are out of contact, the oil cylinder continues to work. In the case that the pulley assembly stops rotating is detected, the oil cylinder stops working. At this time, the twist of the first connecting piece itself has been eliminated, and the tensile test can be performed again.

[0168] By adopting the above technical scheme, the area change value of the contact position is detected, and the working mode of the oil cylinder is adjusted according to the area change value, so that the oil cylinder can adjust the posture of the pulley assembly, and ensure that the pulley assembly is tested in a normal state, thereby improving the accuracy of the test result.

[0169] In the following embodiments, when the pulley assembly is subjected to the tension test, it is necessary to ensure that the pulley assembly does not have abnormal jitter to ensure the accuracy of the tension test. Therefore, the present application embodiment discloses a pulley assembly position adjustment method I. Referring to Figure 7 The method comprises:

[0170] Step S701: Obtain a force value difference set in a historical period.

[0171] For example, the historical period is the past 5 hours.

[0172] The force difference set is a set formed by the force difference whose timestamp is located in the historical period.

[0173] Step S702: Calculate the peak-to-average ratio of each force value difference in the force value difference set to obtain a difference peak-to-average ratio.

[0174] The peak-to-average ratio is the ratio of the peak value to the average value in the force value difference set. For example, the average value of each force value difference in the force value difference set is obtained. The peak value in the force value difference set is obtained. The ratio of the peak value to the average value is calculated to obtain the difference peak-to-average ratio.

[0175] Step S703: Determine whether the difference peak-to-average ratio is greater than a preset peak-to-average ratio threshold.

[0176] If the difference peak-to-average ratio is greater than the preset peak-to-average ratio threshold, step S705 is performed;

[0177] If the difference peak-to-average ratio is not greater than the preset peak-to-average ratio threshold, step S704 is performed.

[0178] Step S704: If not, perform the subsequent steps.

[0179] If the difference peak-to-average ratio is not greater than the preset peak-to-average ratio threshold, it indicates that the state of the pulley assembly is normal, and the subsequent steps can be continued.

[0180] Step S705: If yes, adjust the position of the pulley assembly.

[0181] If the difference peak-to-average ratio is greater than the preset peak-to-average ratio threshold, the position of the pulley assembly needs to be adjusted to ensure that the pulley assembly can maintain a normal state when being tested.

[0182] By using the above technical solution, after obtaining the force value difference set, the difference peak-to-average ratio is used to determine whether the pulley assembly has abnormal jitter, and the corresponding steps are performed to overcome the abnormal jitter of the pulley assembly to ensure the normal operation of the tension test.

[0183] Therefore, the present application embodiment discloses a pulley assembly position adjustment method II. Referring to Figure 8 The method comprises:

[0184] Step S801: Obtain a current position of the pulley assembly.

[0185] The current position is used to describe the distance between the pulley assembly and the base. For example, after obtaining a real-time image captured by the camera, the current position is obtained according to the real-time image.

[0186] Step S802: Control the pulley assembly to move in a first direction by a first preset distance according to the current position.

[0187] The first direction is a preset horizontal direction, and the first preset distance is a preset empirical value. The technical personnel can adjust the specific value of the first preset distance according to the actual demand.

[0188] Step S803: Update the force value difference.

[0189] In this step, the force value difference is updated in real time during the process that the pulley assembly moves in the first direction by the first preset distance, and the position corresponding to the force value difference is recorded.

[0190] Step S804: Determine whether the change amount of the force value difference is greater than a preset change amount threshold.

[0191] If the change amount of the force value difference is greater than the preset change amount threshold, step S805 is performed.

[0192] If the change amount of the force value difference is not greater than the preset change amount threshold, steps S806 to S808 are performed.

[0193] Step S805: If yes, the first direction is updated to a second direction, and the above three steps are repeated.

[0194] In the case that the change amount of the force value difference is greater than the preset change amount threshold, it indicates that the movement of the pulley assembly in the first direction will cause the shaking of the pulley assembly to be intensified, and therefore it is necessary to adjust the moving direction of the pulley assembly.

[0195] The second direction is different from the first direction. For example, the second direction is opposite to the first direction.

[0196] Step S806: If no, control the pulley assembly to move in the first direction by a second preset distance, and record the force value difference to obtain a force value difference set.

[0197] The second preset distance is greater than the first preset distance, and the starting points of the first preset distance and the second preset distance are the same.

[0198] In a case where the variation of the force value difference is not greater than a preset variation threshold, it is indicated that the movement of the pulley assembly in the first direction causes the pulley assembly to slow down the shaking, and thus it is not necessary to adjust the moving direction of the pulley assembly.

[0199] The force value difference set refers to a set formed by the force value differences recorded in the process of moving the pulley assembly in the first direction by a second preset distance.

[0200] Step S807: determining the minimum value in the force value difference set.

[0201] Step S808: setting the pulley assembly at a position corresponding to the minimum value.

[0202] The position corresponding to the minimum value in the force value difference set is a position at which the pulley assembly has the least shaking, and thus setting the pulley assembly at the position can obtain more accurate test results.

[0203] By adopting the above technical solutions, the position of the pulley assembly is adjusted, the force value difference set is recorded in the movement process of the pulley assembly, and the pulley assembly is set at a position corresponding to the minimum value in the force value difference set, so as to reduce the abnormal shaking of the pulley assembly and ensure the accuracy of the test results.

[0204] Based on the same inventive concept, an embodiment of the present application provides a tension test system of a pulley assembly, which is described with reference to Figure 9 The system comprises:

[0205] The acquisition module 901 is configured to acquire a test item and a force curve.

[0206] The memory 902 is configured to store a program of the tension test method of the pulley assembly.

[0207] The processor 903 is configured to load and execute the program in the memory, and implement the tension test method of the pulley assembly.

[0208] By adopting the above technical solutions, the tension test device is used to perform tension test on the pulley assembly, and test results are obtained. Since the pushing direction of the oil cylinder push rod in the tension test device is away from the pulley assembly, the oil cylinder can provide more pushing force, which can adapt to the tension test requirements in various scenarios, and thus improve the test effect of the pulley assembly.

[0209] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0210] The embodiment of the present application provides a computer readable storage medium, which stores a computer program capable of being loaded by a processor and executing the tension test method of the pulley assembly.

[0211] The computer storage medium includes, for example, a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program codes can be stored in the medium.

[0212] Based on the same inventive concept, the embodiment of the present application provides an intelligent terminal, which comprises a memory and a processor, and the memory stores a computer program capable of being loaded by the processor and executing the tension test method of the pulley assembly.

[0213] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0214] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in the specification (including the abstract and drawings) can be replaced by other equivalent or similar features unless specifically described. That is, each feature is only an example of a series of equivalent or similar features unless specifically described.

Claims

1. A method of testing a pulling force of a pulley assembly, characterized by, The method comprises: in response to detecting that the pulley assembly is arranged on the tensile testing device, obtaining a test item of the pulley assembly, the tensile testing device comprising a horizontally arranged base, an oil cylinder and a transmission assembly, the oil cylinder being arranged at a first end of the base, a first end of the transmission assembly being fixed to a push rod of the oil cylinder, a second end of the transmission assembly being connected to a first end of the pulley assembly through a first connecting piece, a second end of the pulley assembly being connected to a second connecting piece fixed to a second end of the base, the push-out direction of the push rod being away from the pulley assembly; according to the test item, setting an operation scheme and a completion condition of the oil cylinder; controlling the oil cylinder to work according to the operation scheme; generating a force curve on the transmission assembly; if the completion condition is met, obtaining a test result of the pulley assembly according to the force curve; in the process of the oil cylinder working according to the operation scheme, obtaining a current force value on the transmission assembly, the operation scheme being that the output power of the oil cylinder is uniformly increased, the current force value corresponding to a current timestamp; obtaining a historical force value according to a last timestamp of the current timestamp; calculating a difference value between the current force value and the historical force value to obtain a force value difference; determining whether the force value difference is greater than a preset difference threshold; if yes, recording the current force value and controlling the oil cylinder to stop working; if no, executing the step of controlling the oil cylinder to work according to the operation scheme; monitoring a pressure value on the base; obtaining a gravity value of the pulley assembly according to the weight of the pulley assembly; calculating a difference value between the pressure value and the gravity value to obtain a pressure difference value; calculating a ratio of the pressure difference value to the current force value to obtain a first conversion coefficient; generating a second conversion coefficient according to the first conversion coefficient; updating the current force value by using the product of the second conversion coefficient and the current force value.

2. The method of testing the pull force of a pulley assembly of claim 1, wherein, The method further comprises: in the case that the pressure value is greater than a preset upper pressure limit and the direction of the pressure value is vertically downward, obtaining attitude information of the pulley assembly; in the case that the attitude information corresponds to a first attitude, stopping the step of controlling the oil cylinder to work according to the operation scheme, the first attitude indicating that the contact area between the pulley assembly and the base is greater than a preset area threshold; in the case that the attitude information corresponds to a second attitude, determining a contact position between the pulley assembly and the base according to the attitude information, the second attitude indicating that the contact area of the pulley assembly is less than the preset area threshold; adjusting the attitude of the pulley assembly according to the contact position.

3. The method of claim 2, wherein, The adjusting the attitude of the pulley assembly according to the contact position comprises: obtaining a current power of the oil cylinder; calculating a sum value of the current power and a preset difference power to obtain a target power; increasing the output power of the oil cylinder at a preset rate until the output power is increased to the target power; monitoring an area change value of the contact position; If the area change value is greater than a preset change threshold, the step of controlling the oil cylinder to work according to the operation scheme is performed. If the area change value is less than a preset change threshold, the oil cylinder is controlled to stop working. The height of the pulley assembly is adjusted to remove the contact between the pulley assembly and the base.

4. The method of testing the pull force of a pulley assembly of claim 1, wherein, The method further comprises: obtaining a set of force value difference values in a historical period; calculating a peak-to-average ratio of each force value difference value in the set of force value difference values to obtain a difference peak-to-average ratio; determining whether the difference peak-to-average ratio is greater than a preset peak-to-average ratio threshold; if not, performing a subsequent step; if yes, adjusting the position of the pulley assembly.

5. The method of testing the pull force of a pulley assembly of claim 4, wherein, The adjustment of the position of the pulley assembly comprises: obtaining a current position of the pulley assembly; controlling the pulley assembly to move in a first direction by a first preset distance according to the current position; updating the force value difference; determining whether the change amount of the force value difference is greater than a preset change amount threshold; if yes, updating the first direction to a second direction and repeating the above three steps; if not, controlling the pulley assembly to move in the first direction by a second preset distance and recording the force value difference to obtain a set of force value difference values; determining a minimum value in the set of force value difference values; setting the pulley assembly at a position corresponding to the minimum value.

6. A pull test system for a pulley assembly, comprising: The system is used to perform the pulley assembly tension test method according to any one of claims 1 to 5, comprising: an acquisition module for acquiring a test item and a force curve; a memory for storing a program of the pulley assembly tension test method; a processor, the program in the memory can be loaded and executed by the processor and implement the pulley assembly tension test method.

7. A smart terminal, characterized by comprising a memory and a processor, the memory has stored a computer program capable of being loaded and executed by the processor to perform the pulley assembly tension test method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, a computer program capable of being loaded and executed by the processor to perform the pulley assembly tension test method according to any one of claims 1 to 5.

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