A lifting machinery rated load test device

Abstract

The present invention relates to a rated load test device for lifting machinery, comprising a base, wherein the left side of the front and rear sides of the upper end of the base are connected to legs through a connecting shaft, the right side of the legs are threadedly plugged with a first horizontal adjustment knob, and the middle part of the right side of the base is threadedly plugged with a second horizontal adjustment knob; an adjustment slot is opened in the middle part of the upper side of the base, and a compensation device guide rail is fixedly plugged in the front and rear sides of the adjustment slot, and the compensation device guide rail is inserted through the front and rear sides of a connecting plate, and the middle part of the upper end of the connecting plate is connected to a rotary adjustment plate through a bearing. Through the overall structure of the equipment, the overall structure can be stored together, so that after the equipment is used, it can be stored to reduce the volume of the overall structure, making the overall structure more convenient to carry, and at the same time, it can realize horizontal adjustment, tilt angle adjustment, rotation angle adjustment and position adjustment, which can make the detection of the test device more accurate and convenient.

Description

Technical Field

[0001] The invention relates to the field of hoisting machinery measurement, and in particular to a hoisting machinery rated load testing device. Background Art

[0002] According to relevant standards and specifications, it is used to provide support for deflection detection and camber detection during rated load tests and static load tests in the processes of supervisory inspection, periodic inspection and self-inspection of lifting machinery. Its data is used to determine whether the rigidity of the metal structure of the tested lifting machinery meets the relevant standards and specifications and whether it meets the use requirements, so as to decide whether to use, stop using, repair or scrap it;

[0003] At present, the theodolite and laser rangefinder are commonly used for testing the rated load of lifting machinery. Both of these devices and the supporting detection methods have measurement errors that cannot be ignored, which affects the accuracy of actual detection, and there are insurmountable inapplicability in use sites and operations. Therefore, we propose a rated load test device for lifting machinery. Summary of the invention

[0004] The embodiment of the present invention provides a lifting machinery rated load test device to solve the problem that the rated load test of lifting machinery currently generally uses theodolite and laser rangefinder for detection. These two devices and the supporting detection methods have measurement errors that cannot be ignored, which affects the accuracy of actual detection, and there are insurmountable problems of inapplicability in use site and operation.

[0005] or,

[0006] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a lifting machinery rated load test device, including a base, the left side of the front and rear sides of the upper end of the base are connected to the legs through a connecting shaft, the right side of the legs are threadedly plugged with a first horizontal adjustment knob, and the middle part of the right side of the base is threadedly plugged with a second horizontal adjustment knob;

[0007] An adjustment groove is opened in the middle of the upper side of the base, and the front and rear sides of the adjustment groove are fixedly plugged with compensation device guide rails, and the inside of the adjustment groove is movably plugged with a connecting plate, and the compensation device guide rails penetrate and are plugged into the front and rear sides of the connecting plate, and the middle part of the upper end of the connecting plate is connected with a rotary adjustment plate through a bearing, and the front and rear sides of the upper end of the rotary adjustment plate are fixedly connected with connecting blocks, and the connecting blocks are connected with a test unit through a connecting shaft, and the upper end of the rotary adjustment plate is fixedly embedded with a horizontal steam drum on the left side of the test unit.

[0008] Preferably, a spring positioning pin is movably inserted at the upper end of each of the connection blocks.

[0009] Preferably, a compensation adjustment knob is connected to the inner side of the upper end of the base, a gear is fixedly sleeved on the lower end of the compensation adjustment knob, and the gear is meshed and connected with the front rack of the connecting plate.

[0010] Preferably, a compensating vernier scale is provided on the rear side of the upper end of the base.

[0011] Preferably, storage grooves are provided on the front and rear sides of the right end of the base.

[0012] Preferably, a positioning ring is fixedly sleeved on the outer upper part of the compensation adjustment knob, an elastic rubber ring is fixedly connected to the lower end of the positioning ring, and the lower end of the elastic rubber ring is pressed and fitted with the upper end surface of the base.

[0013] A method for measuring the height of a lifting machinery rated load test device comprises the following steps:

[0014] Determining a reference point and a reference horizontal plane coplanar with the reference point;

[0015] The reference point is located on one side directly below the main beam of the lifting machinery;

[0016] Measuring the distance between the reference point and the point to be measured of the object to be measured, obtaining a measured distance, and obtaining a measuring straight line collinear with the measured distance;

[0017] Measuring the angle between the measuring straight line and the reference horizontal plane to obtain a deviation angle;

[0018] According to the measured distance and the offset angle, a trigonometric function is used to calculate the distance between the point to be measured and the reference horizontal plane to obtain a height to be measured.

[0019] A method for measuring the camber of a main beam of a lifting machinery of a lifting machinery rated load test device comprises the following steps:

[0020] Determining a reference point and a reference horizontal plane coplanar with the reference point;

[0021] Measuring the distance between the reference point and the first fulcrum of the main beam to obtain a first measured distance, and obtaining a first measured straight line collinear with the first measured distance;

[0022] Measuring the angle between the first measuring straight line and the reference horizontal plane to obtain a first offset angle;

[0023] According to the first measurement distance and the first offset angle, a distance between the first support point and the reference horizontal plane is calculated by using a trigonometric function to obtain a first height to be measured;

[0024] Measuring the distance between the reference point and the second supporting point of the main beam to obtain a second measured distance, and obtaining a second measured straight line collinear with the second measured distance;

[0025] Measuring the angle between the second measuring straight line and the reference horizontal plane to obtain a second offset angle;

[0026] According to the second measurement distance and the second offset angle, a distance between the second support point and the reference horizontal plane is calculated by using a trigonometric function to obtain a second height to be measured;

[0027] Measuring the distance between the reference point and the apses of the main beam to obtain an upper apses measurement distance, and obtaining an upper apses measurement line collinear with the upper apses measurement distance;

[0028] Measuring the angle between the apsidal point measurement line and the reference horizontal plane to obtain the apsidal point offset angle;

[0029] According to the epicenter measurement distance and the epicenter offset angle, a distance between the epicenter and the reference horizontal plane is calculated using trigonometric functions to obtain a height of the epicenter to be measured;

[0030] The camber of the main beam is calculated based on the first height to be measured, the second height to be measured and the camber point height to be measured.

[0031] A method for measuring the upward tilt of a crane cantilever of a crane rated load test device comprises the following steps:

[0032] Determining a reference point and a reference horizontal plane coplanar with the reference point;

[0033] Measuring the distance between the reference point and the first fulcrum of the main beam to obtain a first measured distance, and obtaining a first measured straight line collinear with the first measured distance;

[0034] Measuring the angle between the first measuring straight line and the reference horizontal plane to obtain a first offset angle;

[0035] According to the first measurement distance and the first offset angle, a distance between the first support point and the reference horizontal plane is calculated by using a trigonometric function to obtain a first height to be measured;

[0036] Measuring the distance between the reference point and the second supporting point of the main beam to obtain a second measured distance, and obtaining a second measured straight line collinear with the second measured distance;

[0037] Measuring the angle between the second measuring straight line and the reference horizontal plane to obtain a second offset angle;

[0038] According to the second measurement distance and the second offset angle, a distance between the second support point and the reference horizontal plane is calculated by using a trigonometric function to obtain a second height to be measured;

[0039] Measuring the distance between the reference point and the end point of the effective cantilever to obtain an upturned point measurement distance, and obtaining an upturned point measurement straight line collinear with the upturned point measurement distance;

[0040] Measuring the angle between the upward point measurement straight line and the reference horizontal plane to obtain the upward point offset angle;

[0041] According to the measured distance of the upturned point and the offset angle of the upturned point, a distance between the end point of the effective cantilever and the reference horizontal plane is calculated by using trigonometric functions to obtain the height of the upturned point to be measured;

[0042] Obtaining the projected length of the main beam on the reference horizontal plane;

[0043] Obtaining the projection length of the effective cantilever on the reference horizontal plane;

[0044] The cantilever upturn degree is calculated according to the first height to be measured, the second height to be measured, the upturned point height to be measured, the projection length of the main beam on the reference horizontal plane and the projection length of the effective cantilever on the reference horizontal plane.

[0045] A method for compensating and measuring the vertical static deflection at the mid-span and the cantilever end of a crane main beam of a crane rated load test device when torsion occurs at the mid-span and the cantilever end, comprising the following steps:

[0046] Determining a reference point and a reference horizontal plane coplanar with the reference point;

[0047] When no load:

[0048] Measuring the distance between the reference point and the point to be measured (the upper supply point or the effective cantilever end point) of the main beam to be measured, obtaining the no-load measurement distance, and obtaining the no-load measurement straight line collinear with the no-load measurement distance;

[0049] Measuring the angle between the no-load measurement straight line and the reference horizontal plane to obtain a no-load deviation angle;

[0050] Rated load:

[0051] The no-load measurement straight line is maintained unchanged, and the distance between the reference point and the main beam to be measured is measured to obtain the rated load measurement distance;

[0052] According to the no-load measurement distance, the no-load deviation angle and the rated load measurement distance, a compensation distance is calculated by using trigonometric functions, and a compensation straight line that is parallel to the compensation distance and has the same length as the compensation distance is obtained;

[0053] Determining a compensation reference point according to the compensation distance and the reference point;

[0054] The compensation reference point, the reference point and the reference horizontal plane are coplanar;

[0055] The compensation reference point and the reference point are respectively two end points of the compensation straight line;

[0056] The compensation straight line is coplanar with the reference horizontal plane, and the compensation straight line coincides with a projection line of the no-load measurement straight line on the reference horizontal plane;

[0057] Rated load:

[0058] Measuring the distance between the compensation reference point and the measured main beam to obtain a rated load compensation measurement distance, and obtaining a rated load compensation measurement straight line collinear with the rated load compensation measurement distance, wherein the rated load compensation measurement straight line is parallel to the no-load measurement straight line;

[0059] Measuring the angle between the rated load compensation measurement line and the reference horizontal plane to obtain a rated load compensation offset angle, wherein the rated load compensation offset angle is equal to the no-load offset angle;

[0060] According to the rated load compensation measurement distance and the rated load compensation offset angle, a trigonometric function is used to calculate the upper supply point compensation height to be measured (or the upper warping point compensation height to be measured) when the mid-span (or cantilever end) of the crane main beam is twisted;

[0061] When no load:

[0062] According to the method for measuring the camber of a main beam of a lifting machinery according to a rated load test device of a lifting machinery as claimed in claim 8, the camber of the main beam without load is obtained;

[0063] Rated load:

[0064] According to the method for measuring the camber of a main beam of a crane for a rated load test device of a crane according to claim 8, a first height to be measured under rated load and a second height to be measured under rated load are obtained;

[0065] The rated load main beam compensation upper supply degree is calculated according to the rated load first height to be measured, the rated load second height to be measured and the upper supply point compensation height to be measured;

[0066] The vertical static deflection at the mid-span when the main beam is twisted is calculated based on the camber of the unloaded main beam and the compensatory camber of the rated-load main beam.

[0067] When no load:

[0068] According to the method for measuring the upward tilt of a crane cantilever arm of a crane rated load test device according to claim 9, the upward tilt of the unloaded cantilever arm is obtained;

[0069] Rated load:

[0070] According to the method for measuring the upward tilt of a crane cantilever of a crane rated load test device of claim 9, a first height to be measured under rated load and a second height to be measured under rated load are obtained;

[0071] The rated load cantilever compensation upwarping degree is calculated according to the rated load first height to be measured, the rated load second height to be measured, the main beam span and the effective cantilever length and the upwarping point compensation height to be measured;

[0072] The vertical static deflection of the cantilever end when the cantilever end is twisted is calculated according to the unloaded cantilever upwarp and the rated load cantilever compensated upwarp.

[0073] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0074] 1. The method provided by the embodiment of the present invention can be stored together through the overall structure of the device. After the device is used, the volume of the overall structure can be reduced, making the overall structure more convenient to carry. At the same time, it can realize horizontal adjustment, tilt angle adjustment, rotation angle adjustment and position adjustment, so that the detection of the test device can be more accurate and convenient.

[0075] 2. An embodiment of the present invention provides a method for measuring the overall structure. By converting the method of directly measuring the vertical height of the object to be measured into the method of measuring the oblique length and the offset angle, and then using trigonometric functions to calculate the vertical height, on the one hand, the measuring distance is extended (the hypotenuse is larger than the right-angled side), thereby reducing the error laterally. On the other hand, since it is generally impossible to accurately find the vertical bottom of the object to be measured during actual measurement, the verticality of the measured vertical height cannot be guaranteed. This method can avoid searching for the vertical bottom of the object to be measured, thereby eliminating the human error of this part. In summary, the above two points can effectively improve the accuracy of detection.

[0076] 3. The embodiment of the present invention provides a method for measuring the overall structure. By converting the method of directly measuring the vertical height of the object to be measured into measuring the oblique length and the offset angle, and then using trigonometric functions to calculate the vertical height, on the one hand, it reduces the links of manual adjustment and observation in the traditional measurement method, eliminating the human error in this part, and on the other hand, it changes the measurement position, solves the disadvantage that it is not possible to measure directly below the object to be measured in actual measurement, and improves the accuracy of measurement from the side. In summary, the above two points can improve the accuracy and operability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0078] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0079] Figure 1 An overall structural diagram of a lifting machinery rated load test device provided in an embodiment of the present application;

[0080] Figure 2 An overall structural diagram of a lifting machinery rated load test device provided in an embodiment of the present application during operation;

[0081] Figure 3 A structural diagram of a front rack of a connecting plate of a lifting machinery rated load test device provided in an embodiment of the present application;

[0082] Figure 4 A cross-sectional view of a compensation adjustment knob of a lifting machinery rated load test device provided in an embodiment of the present application;

[0083] Figure 5 A schematic diagram of the principle of a method for measuring the height of a lifting machinery in a lifting machinery rated load test device provided in an embodiment of the present application;

[0084] Figure 6 A schematic diagram of the principle of a method for measuring the camber of a main beam of a crane and a method for measuring the upwarp of a cantilever of a crane rated load test device provided in an embodiment of the present application;

[0085] Figure 7 A schematic diagram of the principle of a method for compensating for the vertical static deflection at the mid-span and cantilever end of a crane main beam of a crane rated load test device provided in an embodiment of the present application when twisting occurs at the mid-span and cantilever end.

[0086] In the figure: 1 base, 2 legs, 3 first horizontal adjustment knob, 4 second horizontal adjustment knob, 5 connecting plate, 6 connecting block, 7 test unit, 8 storage groove, 9 compensation adjustment knob, 91 positioning ring, 92 elastic rubber ring, 10 adjustment groove, 11 spring positioning pin, 12 compensation device guide rail, 13 rotary adjustment plate, 14 horizontal drum, 15 rack, 16 gear. DETAILED DESCRIPTION

[0087] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0088] like Figure 1-7 As shown, an embodiment of the present invention provides a lifting machinery rated load test device, comprising a base 1, the upper end of the base 1 is connected to a support leg 2 on the front and rear sides thereof through a connecting shaft, the right side of each support leg 2 is threadedly plugged with a first level adjustment knob 3, and the middle part of the right side of the base 1 is threadedly plugged with a second level adjustment knob 4;

[0089] An adjustment groove 10 is opened in the middle of the upper side of the base 1, and a compensation device guide rail 12 is fixedly inserted at the front and rear sides of the adjustment groove 10, and a connecting plate 5 is movably inserted inside the adjustment groove 10, and the compensation device guide rail 12 penetrates and is inserted at the front and rear sides of the connecting plate 5. A rotary adjustment plate 13 is connected to the middle of the upper end of the connecting plate 5 through a bearing, and the rotary adjustment plate 13 can rotate 360 ​​degrees. The front and rear sides of the upper end of the rotary adjustment plate 13 are fixedly connected with connecting blocks 6, and the connecting blocks 6 are connected with test units 7 through connecting shafts. The test unit 7 has basic functions such as angle measurement function, distance measurement function and data calculation and processing involved in this specification. A horizontal steam drum 14 is fixedly embedded on the upper end of the rotary adjustment plate 13 on the left side of the test unit 7. The horizontal steam drum 14 can detect whether the base 1 is in a horizontal state.

[0090] like Figure 1 and Figure 2 As shown, the upper end of the connecting block 6 is movably connected with a spring positioning pin 11. When the test unit 7 rotates, the elastic positioning pin 11 will always squeeze the outer side of the rotating shaft connecting the test unit 7 and the connecting block 6, so as to position the angle of the test unit 7 after rotation.

[0091] like Figure 2 and Figure 4 As shown, a compensation adjustment knob 9 is connected to the inner side of the upper end of the base 1, and a gear 16 is fixedly sleeved on the lower end of the compensation adjustment knob 9, and the gear 16 is meshed with the front side rack 15 of the connecting plate 5. When the compensation adjustment knob 9 is manually rotated, the gear 16 at the lower end can be driven to rotate, thereby driving the rack 15 to move, and the connecting plate 11 to move, thereby adjusting the position of the upper test unit 7.

[0092] like Figure 2As shown, a compensating vernier ruler is provided on the rear side of the upper end of the base 1 , and the compensating vernier ruler can measure the displacement distance of the connecting plate 5 .

[0093] like Figure 1 and Figure 2 As shown, the front and rear sides of the right end of the base 1 are both provided with storage grooves 8, and the left side of the upper end of the base 1 is connected with a cover plate through a hinge. The storage groove 8 can be inserted into the first horizontal adjustment knob 3 when the leg 2 is stored.

[0094] like Figure 4 As shown, a positioning ring 91 is fixedly sleeved on the upper outer side of the compensation adjustment knob 9, and an elastic rubber ring 92 is fixedly connected to the lower end of the positioning ring 91. The lower end of the elastic rubber ring 92 and the upper end surface of the base 1 are pressed and fitted against each other, so that after the compensation adjustment knob 9 is rotated and adjusted, the elastic rubber ring 92 and the upper end surface of the base 1 are pressed and fitted to increase the friction force, so that the compensation adjustment knob 9 will not be easily rotated due to external force.

[0095] Embodiment 1

[0096] The present invention provides a method for measuring the height of a lifting machine, comprising the following steps:

[0097] S1. Determine a reference point and a reference horizontal plane coplanar with the reference point; the reference point is located on one side directly below the main beam of the lifting machinery;

[0098] S2, measuring the distance between the reference point and the point to be measured of the object to obtain a measured distance, and obtaining a measuring straight line collinear with the measured distance;

[0099] S3, measuring the angle between the measuring straight line and the reference horizontal plane to obtain a deviation angle;

[0100] S4. Calculate the distance between the point to be measured and the reference horizontal plane using trigonometric functions according to the measured distance and the offset angle to obtain a height to be measured.

[0101] Embodiment 2

[0102] The present invention provides a method for measuring the camber of a main beam of a lifting machinery, comprising the following steps:

[0103] S1. Determine a reference point and a reference horizontal plane coplanar with the reference point;

[0104] S2, measuring the distance between the reference point and the first fulcrum of the main beam to obtain a first measured distance, and obtaining a first measured straight line collinear with the first measured distance;

[0105] S3, measuring the angle between the first measuring straight line and the reference horizontal plane to obtain a first offset angle;

[0106] S4. Calculate the distance between the first support point and the reference horizontal plane using trigonometric functions according to the first measurement distance and the first offset angle to obtain a first height to be measured;

[0107] S5, measuring the distance between the reference point and the second supporting point of the main beam to obtain a second measured distance, and obtaining a second measuring straight line collinear with the second measured distance;

[0108] S6, measuring the angle between the second measurement straight line and the reference horizontal plane to obtain a second offset angle;

[0109] S7, calculating the distance between the second support point and the reference horizontal plane using a trigonometric function according to the second measurement distance and the second offset angle to obtain a second height to be measured;

[0110] S8, measuring the distance between the reference point and the upper abutment of the main beam (the upper abutment is located within the range of S / 10 in the middle of the span of the main beam, where S is the span), obtaining the upper abutment measurement distance, and obtaining the upper abutment measurement line collinear with the upper abutment measurement distance;

[0111] S9, measuring the angle between the apsidal point measurement line and the reference horizontal plane to obtain an apsidal point offset angle;

[0112] S10, calculating the distance between the epicenter and the reference horizontal plane using trigonometric functions according to the epicenter measurement distance and the epicenter offset angle, to obtain the epicenter height to be measured;

[0113] S11. Calculate the camber of the main beam according to the first height to be measured, the second height to be measured and the height to be measured of the camber point.

[0114] Embodiment 3

[0115] The present invention provides a method for measuring the upward tilt of a crane cantilever, comprising the following steps:

[0116] S1. Determine a reference point and a reference horizontal plane coplanar with the reference point;

[0117] S2, measuring the distance between the reference point and the first fulcrum of the main beam to obtain a first measured distance, and obtaining a first measured straight line collinear with the first measured distance;

[0118] S3, measuring the angle between the first measuring straight line and the reference horizontal plane to obtain a first offset angle;

[0119] S4. Calculate the distance between the first support point and the reference horizontal plane using trigonometric functions according to the first measurement distance and the first offset angle to obtain a first height to be measured;

[0120] S5, measuring the distance between the reference point and the second supporting point of the main beam to obtain a second measured distance, and obtaining a second measuring straight line collinear with the second measured distance;

[0121] S6, measuring the angle between the second measurement straight line and the reference horizontal plane to obtain a second offset angle;

[0122] S7, calculating the distance between the second support point and the reference horizontal plane using a trigonometric function according to the second measurement distance and the second offset angle to obtain a second height to be measured;

[0123] S8, measuring the distance between the reference point and the end point of the effective cantilever to obtain an upturned point measurement distance, and obtaining an upturned point measurement straight line collinear with the upturned point measurement distance;

[0124] S9, measuring the angle between the upward point measurement line and the reference horizontal plane to obtain the upward point offset angle;

[0125] S10, calculating the distance between the end point of the effective cantilever and the reference horizontal plane using trigonometric functions according to the measured distance of the upturned point and the offset angle of the upturned point, to obtain the height of the upturned point to be measured;

[0126] S11, obtain the main beam span;

[0127] S12, obtain the effective cantilever length;

[0128] S13. Calculate the cantilever upturn according to the first height to be measured, the second height to be measured, the height to be measured of the upturned point, the main beam span and the effective cantilever length.

[0129] Embodiment 4:

[0130] The present invention provides a method for compensating and measuring the vertical static deflection at the mid-span and the cantilever end of a crane main beam when torsion occurs at the mid-span and the cantilever end, comprising the following steps:

[0131] S1. Determine a reference point and a reference horizontal plane coplanar with the reference point;

[0132] S2, no-load:

[0133] Measuring the distance between the reference point and the point to be measured (the upper supply point or the effective cantilever end point) of the main beam to be measured, obtaining the no-load measurement distance, and obtaining the no-load measurement straight line collinear with the no-load measurement distance;

[0134] Measuring the angle between the no-load measurement straight line and the reference horizontal plane to obtain a no-load deviation angle;

[0135] S3, rated load:

[0136] The no-load measurement straight line is maintained unchanged, and the distance between the reference point and the main beam to be measured is measured to obtain the rated load measurement distance;

[0137] S4. According to the no-load measurement distance, the no-load deviation angle and the rated load measurement distance, a compensation distance is calculated by using trigonometric functions, and a compensation straight line that is parallel to the compensation distance and has the same length as the compensation distance is obtained;

[0138] S5. Determine a compensation reference point according to the compensation distance and the reference point;

[0139] The compensation reference point, the reference point and the reference horizontal plane are coplanar;

[0140] The compensation reference point and the reference point are respectively two end points of the compensation straight line;

[0141] The compensation straight line is coplanar with the reference horizontal plane, and the compensation straight line coincides with a projection line of the no-load measurement straight line on the reference horizontal plane;

[0142] S6, rated load:

[0143] Measuring the distance between the compensation reference point and the measured main beam to obtain a rated load compensation measurement distance, and obtaining a rated load compensation measurement straight line collinear with the rated load compensation measurement distance, wherein the rated load compensation measurement straight line is parallel to the no-load measurement straight line;

[0144] Measuring the angle between the rated load compensation measurement line and the reference horizontal plane to obtain a rated load compensation offset angle, wherein the rated load compensation offset angle is equal to the no-load offset angle;

[0145] S7, according to the rated load compensation measurement distance and the rated load compensation offset angle, using trigonometric functions, calculate the upper supply point compensation height to be measured (or the upward point compensation height to be measured) when the mid-span (or cantilever end) of the crane main beam is twisted;

[0146] S8, no-load:

[0147] According to the method for measuring the camber of the main beam of a crane according to claim 8, the camber of the unloaded main beam is obtained;

[0148] S9, rated load:

[0149] According to the method for measuring the camber of the main beam of a lifting machinery according to claim 8, the first height to be measured under rated load and the second height to be measured under rated load are obtained;

[0150] The rated load main beam compensation upper supply degree is calculated according to the rated load first height to be measured, the rated load second height to be measured and the upper supply point compensation height to be measured;

[0151] S10. Calculate the mid-span vertical static deflection of the main beam when torsion occurs according to the camber of the unloaded main beam and the compensatory camber of the rated-load main beam.

[0152] S11, no-load:

[0153] According to the method for measuring the upward tilt of the crane cantilever according to claim 9, the upward tilt of the unloaded cantilever is obtained;

[0154] S12, rated load:

[0155] According to the method for measuring the upward tilt of the crane cantilever according to claim 9, the first height to be measured under rated load and the second height to be measured under rated load are obtained;

[0156] The rated load cantilever compensation upwarping degree is calculated according to the rated load first height to be measured, the rated load second height to be measured, the main beam span and the effective cantilever length and the upwarping point compensation height to be measured;

[0157] S13. Calculate the vertical static deflection of the cantilever end when the cantilever end is twisted according to the no-load cantilever upwarp and the rated-load cantilever compensation upwarp.

[0158] When the equipment is in use, first open the cover plate on the upper end of the equipment, and rotate the two legs 2 so that the first horizontal adjustment knob 3 and the second horizontal adjustment knob 4 are located at the three points of the triangle, and then manually rotate the first horizontal adjustment knob 3 and the second horizontal adjustment knob 4 to level the base 1, and then manually rotate the test unit 7 so that the test unit is at a certain angle, and when the test unit 7 rotates, the elastic positioning pin 11 will always squeeze the outside of the rotating shaft connecting the test unit 7 and the connecting block 6, so that the angle of the test unit 7 after rotation can be positioned. After the adjustment is completed, check again whether the bubble in the horizontal drum 14 is in the middle. If it is in the middle, no leveling is required, otherwise leveling is performed again. When the main beam is twisted during the rated load test and compensation measurement is required, by rotating the compensation adjustment knob 9, the lower end of the compensation adjustment knob 9 is meshed with the front rack of the connecting plate 11 through the gear, which can drive the connecting plate 5 to move left and right, thereby adjusting the position of the test unit 7 and performing compensation measurement according to the required compensation distance. After the measurement is completed, the overall structure can be stored together. After the equipment is used, the volume of the overall structure can be reduced, making the overall structure more convenient to carry. The principle of overall structure measurement is as follows:

[0159] A method for measuring the height of a lifting machine comprises the following steps: Figure 5

[0160] S1. The hoisting machinery rated load test device provided in Example 1 (Example 1 is not mentioned before) is placed on the ground, leveled, and the test unit 7 is adjusted to aim at the test point C of the hoisting machinery to be tested, thereby determining the reference point A, i.e., the starting point of the laser of the test unit 7, and the reference horizontal plane coplanar with the reference point;

[0161] S2, measuring the distance between the reference point A and the to-be-measured point C of the object by the test unit 7, obtaining the measured distance AC, and obtaining a measuring straight line collinear with the measured distance AC, i.e., the straight line where the laser is located;

[0162] S3, measuring the angle between the measuring straight line and the reference horizontal plane to obtain the deviation angle α;

[0163] S4, according to the measured distance AC and the offset angle α, using trigonometric functions, calculate the distance between the point to be measured and the reference horizontal plane to obtain the height CE to be measured;

[0164] The formula is: CE=AC×sinα.

[0165] Based on a method for measuring the height of lifting machinery Figure 6 This embodiment provides a method for measuring the camber of a main beam of a lifting machinery, comprising the following steps:

[0166] S1. Place the lifting machinery rated load test device provided in Example 1 (Example 1 is not mentioned before) on the ground, level it, adjust the test unit 7, determine the reference point O, and the reference horizontal plane OAC coplanar with the reference point;

[0167] S2, adjust the test unit 7 to point to the first fulcrum A' of the main beam, measure the distance between the reference point O and the first fulcrum A', obtain a first measured distance OA', and obtain a first measuring straight line that is collinear with the first measured distance OA';

[0168] S3, measuring the angle between the first measuring straight line and the reference horizontal plane to obtain a first offset angle ∠AOA';

[0169] S4, according to the first measurement distance OA' and the first offset angle ∠AOA', using trigonometric functions, calculate the distance between the first fulcrum A' and the reference horizontal plane to obtain a first height to be measured AA';

[0170] The formula is: AA' = OA' × sin ∠ AOA';

[0171] S5, adjust the test unit 7 to point to the second fulcrum C' of the main beam, measure the distance between the reference point O and the second fulcrum C', obtain a second measured distance OC', and obtain a second measurement line that is collinear with the second measured distance OC';

[0172] S6, measuring the angle between the second measuring straight line and the reference horizontal plane to obtain a second offset angle ∠COC';

[0173] S7, according to the second measured distance OC' and the second offset angle ∠COC', using trigonometric functions, calculate the distance between the second fulcrum C' and the reference horizontal plane to obtain a second height CC' to be measured;

[0174] The formula is: CC' = OC' × sin ∠ COC';

[0175] S8, adjust the test unit 7 to point to the upper apsidal point B' of the main beam, measure the distance between the reference point O and the upper apsidal point B', obtain the upper apsidal point measurement distance OB', and obtain the upper apsidal point measurement line collinear with the upper apsidal point measurement distance OB';

[0176] S9, measuring the angle between the upper apsidal point measuring line and the reference horizontal plane to obtain the upper apsidal point offset angle ∠BOB';

[0177] S10, according to the epicenter measurement distance OB' and the epicenter offset angle ∠BOB', using trigonometric functions, calculate the distance between the epicenter B' and the reference horizontal plane to obtain the epicenter height BB' to be measured;

[0178] The formula is: BB' = OB' × sin∠BOB';

[0179] S11, according to the first height to be measured AA', the second height to be measured CC' and the height to be measured BB' of the upper camber point, calculate the actual upper camber H1 of the main beam, that is, the upper camber in the no-load state, at which time the crane trolley is at position ①;

[0180] The formula is: H1 = BB'-(AA'+CC') / 2-ΔT;

[0181] Where: ΔT is the correction value for sunlight impact specified in Appendix B.0.1 of GB 50278-2010.

[0182] S11.1. The same method can be used to obtain the camber H3 of the main beam with rated load. At this time, the rated load hoisting trolley is located at position ③;

[0183] The formula is: H3 = BB”-(AA”+CC”) / 2-ΔT;

[0184] Where: B”, A”, C” are the positions of B’, A’, C’ respectively after lifting the rated load, ΔT is the correction value for the sunlight effect specified in Appendix B.0.1 of GB 50278-2010;

[0185] S12. Based on the above values, the mid-span vertical static deflection △H can also be calculated;

[0186] The formula is: △H=H1-H3=BB'-(AA'+CC') / 2-BB"+(AA"+CC") / 2;

[0187] Based on a method for measuring the camber of the main beam of a lifting machinery Figure 7 This embodiment provides a method for measuring the upward tilt of a crane cantilever, comprising the following steps:

[0188] S1. Place the hoisting machinery rated load test device provided in Example 1 on the ground, level it, adjust the test unit 7, determine the reference point O, and the reference horizontal plane OAD coplanar with the reference point O;

[0189] S2, adjust the test unit 7 to point to the first fulcrum A' of the main beam, measure the distance between the reference point O and the first fulcrum A', obtain a first measured distance OA', and obtain a first measuring straight line that is collinear with the first measured distance OA';

[0190] S3, measuring the angle between the first measuring straight line and the reference horizontal plane to obtain a first offset angle ∠AOA';

[0191] S4, according to the first measurement distance OA' and the first offset angle ∠AOA', using trigonometric functions, calculate the distance between the first fulcrum A' and the reference horizontal plane to obtain a first height to be measured AA';

[0192] The formula is: AA' = OA' × sin ∠ AOA';

[0193] S5, adjust the test unit 7 to point to the second fulcrum C' of the main beam, measure the distance between the reference point O and the second fulcrum C', obtain a second measured distance OC', and obtain a second measurement line that is collinear with the second measured distance OC';

[0194] S6, measuring the angle between the second measuring straight line and the reference horizontal plane to obtain a second offset angle ∠COC';

[0195] S7, according to the second measured distance OC' and the second offset angle ∠COC', using trigonometric functions, calculate the distance between the second fulcrum C' and the reference horizontal plane to obtain a second height CC' to be measured;

[0196] The formula is: CC' = OC' × sin ∠ COC';

[0197] S8, adjusting the test unit 7 so that the end point of the cantilever is the end point D' of the effective cantilever, that is, the upturned point D', measuring the distance between the reference point O and the upturned point D', obtaining the upturned point measurement distance OD', and obtaining the upturned point measurement straight line collinear with the upturned point measurement distance OD';

[0198] S9, measuring the angle between the upturned point measuring line and the reference horizontal plane to obtain the upturned point offset angle ∠DOD';

[0199] S10, according to the upturned point measurement distance OD' and the upturned point offset angle ∠DOD', using trigonometric functions, calculate the distance between the upturned point D' and the reference horizontal plane to obtain the upturned point height DD' to be measured;

[0200] The formula is: DD' = OD' × sin∠DOD';

[0201] S11, get the main beam span AC:

[0202] S12, get the effective cantilever length CD:

[0203] S13, according to the first height to be measured AA', the second height to be measured CC', the height to be measured DD' of the upturned point, the main beam span AC and the effective cantilever length CD, calculate the actual upturn H2 of the cantilever, that is, the upturn of the cantilever end in the unloaded state, when the trolley is at position ①;

[0204] The formula is: H2 = DD'-CC'-CD × (CC'-AA') / AC-ΔT;

[0205] Where: ΔT is the correction value for sunlight impact specified in Appendix B.0.1 of GB 50278-2010.

[0206] S13.1. The same method can be used to obtain the rated load upward tilt H4 of the cantilever. At this time, the rated load lifting trolley is at position ④;

[0207] The formula is: H4 = DD”-CC”-CD×(CC”-AA”) / AC-ΔT;

[0208] Where: D”, A”, C” are the positions of D’, A’, C’ after loading, respectively; ΔT is the correction value for the sunlight effect specified in Appendix B.0.1 of GB 50278-2010;

[0209] S14. Based on the above values, the vertical static deflection △H suspension of the cantilever end can also be calculated:

[0210] The formula is: △H 悬 =H2-H4=DD'-CC'-CD×(CC'-AA') / AC-DD”+CC”+CD×(CC”-AA”) / AC

[0211] Please refer to Figure 7 , position ① is the position of the lower cover plate of the main beam when the hoisting machinery under test is in the no-load state, and position ② is the position of the lower cover plate after the main beam is twisted when the hoisting machinery under test is in the rated load state;

[0212] This embodiment provides a method for compensating and measuring the vertical static deflection at the mid-span and the cantilever end of a crane main beam when torsion occurs at the mid-span and the cantilever end, comprising the following steps:

[0213] S1. Determine a reference point O and a reference horizontal plane coplanar with the reference point;

[0214] S2, no-load:

[0215] Measure the distance between the reference point O and the supply point or the effective cantilever end point of the measured point A of the main beam to be measured, obtain the no-load measurement distance OA, and obtain the no-load measurement straight line collinear with the no-load measurement distance;

[0216] Measuring the angle between the no-load measurement straight line and the reference horizontal plane to obtain a no-load offset angle ∠AOF;

[0217] S3, rated load:

[0218] The no-load measurement straight line is maintained unchanged, and the distance between the reference point and the main beam to be measured is measured to obtain the rated load measurement distance OB;

[0219] S4, according to the no-load measurement distance OA, the no-load offset angle ∠AOF and the rated load measurement distance OB, the compensation distance BC is calculated by using trigonometric functions, and a compensation straight line OO' which is parallel to the compensation distance and has the same length as the compensation distance is obtained;

[0220] S5. Determine a compensation reference point O' according to the compensation distance BC;

[0221] The compensation reference point O', the reference point O and the reference horizontal plane are coplanar;

[0222] The compensation reference point O' and the reference point O are respectively two end points of the compensation straight line;

[0223] The compensation straight line is coplanar with the reference horizontal plane, and the compensation straight line coincides with a projection line of the no-load measurement straight line on the reference horizontal plane;

[0224] S6, rated load:

[0225] The distance between the compensation reference point O' and the measured main beam is measured to obtain a rated load compensation measurement distance O'B', and a rated load compensation measurement straight line collinear with the rated load compensation measurement distance is obtained, and the rated load compensation measurement straight line is parallel to the no-load measurement straight line;

[0226] Measuring the angle between the rated load compensation measurement line and the reference horizontal plane to obtain a rated load compensation offset angle ∠DOF', wherein the rated load compensation offset angle ∠DOF' is equal to the no-load offset angle ∠AOF;

[0227] S7, according to the rated load compensation measurement distance O'B' and the rated load compensation offset angle ∠DOF', using trigonometric functions, calculate the upper supply point compensation height FB' or the upper warping point compensation height FB' to be measured when the crane main beam mid-span or cantilever end is twisted;

[0228] S8, no-load:

[0229] According to the method for measuring the camber of the main beam of a lifting machinery as claimed in claim 8, the camber H1 of the unloaded main beam is obtained;

[0230] S9, rated load:

[0231] Please refer to Figure 6

[0232] According to the method for measuring the camber of the main beam of a lifting machinery as claimed in claim 8, the first height AA" to be measured under rated load and the second height CC" to be measured under rated load are obtained;

[0233] The rated load main beam compensation upper supply height H3 is calculated based on the rated load first measured height AA", the rated load second measured height CC" and the upper supply point compensation measured height FB';

[0234] S10. According to the camber H1 of the unloaded main beam and the compensatory camber H3 of the rated-load main beam, the vertical static deflection △H at the mid-span when the main beam is twisted is calculated, △H=H1-H3.

[0235] After measurement, it is assumed that when the main beam is twisted by 2°, the vertical static deflection DE measured by this method is 20mm, which is 0.01mm different from the actual vertical static deflection AA' of the side point A. It is basically believed that AA'=DE, which meets the use requirements and has high applicability.

[0236] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0237] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for compensating for the vertical static deflection at the mid-span and the cantilever end of a crane main beam of a crane rated load test device when torsion occurs at the mid-span and the cantilever end, characterized in that: The measuring method is carried out using a lifting machinery rated load test device, the lifting machinery rated load test device comprising a base (1), the upper end of the base (1) is connected to a support leg (2) at the front and rear left sides via a connecting shaft, the right side of the support leg (2) is threadedly plugged with a first level adjustment knob (3), and the middle part of the right side of the base (1) is threadedly plugged with a second level adjustment knob (4); An adjustment groove (10) is provided in the middle of the upper side of the base (1), and a compensation device guide rail (12) is fixedly inserted at the front and rear sides of the adjustment groove (10), and a connecting plate (5) is movably inserted inside the adjustment groove (10), and a rack (15) is provided at the lower front end of the connecting plate (5), and the compensation device guide rail (12) penetrates and is inserted at the front and rear sides of the connecting plate (5), and a rotary adjustment plate (13) is connected to the middle of the upper end of the connecting plate (5) through a bearing, and a connecting block (6) is fixedly connected to the front and rear sides of the upper end of the rotary adjustment plate (13), and a test unit (7) is connected between the connecting blocks (6) through a connecting shaft; the upper end of the rotary adjustment plate (13) is fixedly inlaid with a horizontal drum (14) on the left side of the test unit (7); the test unit (7) has an angle measurement function and a distance measurement function; The upper end of the connecting block (6) is movably connected with a spring positioning pin (11). When the test unit (7) rotates, the elastic positioning pin (11) will always press the outer side of the rotating shaft connecting the test unit (7) and the connecting block (6), so as to position the angle of the test unit (7) after rotation; The inner side of the upper end of the base (1) is connected to a compensation adjustment knob (9), the lower end of the compensation adjustment knob (9) is fixedly sleeved with a gear (16), and the gear (16) and the front side rack (15) of the connecting plate (5) are meshed and connected with each other; A positioning ring (91) is fixedly sleeved on the upper outer portion of the compensation adjustment knob (9), and an elastic rubber ring (92) is fixedly connected to the lower end of the positioning ring (91). The lower end of the elastic rubber ring (92) is pressed and fitted with the upper end surface of the base (1). The method comprises the following steps: Determining a reference point and a reference horizontal plane coplanar with the reference point; When no load: Measuring the distance between the reference point and the point to be measured of the main beam to be measured, obtaining a no-load measurement distance, and obtaining a no-load measurement straight line collinear with the no-load measurement distance; Measuring the angle between the no-load measurement straight line and the reference horizontal plane to obtain a no-load deviation angle; Rated load: The no-load measurement straight line is maintained unchanged, and the distance between the reference point and the main beam to be measured is measured to obtain the rated load measurement distance; According to the no-load measurement distance, the no-load deviation angle and the rated load measurement distance, a compensation distance is calculated by using trigonometric functions, and a compensation straight line that is parallel to the compensation distance and has the same length as the compensation distance is obtained; Determining a compensation reference point according to the compensation distance and the reference point; The compensation reference point, the reference point and the reference horizontal plane are coplanar; The compensation reference point and the reference point are respectively two end points of the compensation straight line; The compensation straight line is coplanar with the reference horizontal plane, and the compensation straight line coincides with a projection line of the no-load measurement straight line on the reference horizontal plane; Rated load: Measuring the distance between the compensation reference point and the measured main beam to obtain a rated load compensation measurement distance, and obtaining a rated load compensation measurement straight line collinear with the rated load compensation measurement distance, wherein the rated load compensation measurement straight line is parallel to the no-load measurement straight line; Measuring the angle between the rated load compensation measurement line and the reference horizontal plane to obtain a rated load compensation offset angle, wherein the rated load compensation offset angle is equal to the no-load offset angle; According to the rated load compensation measurement distance and the rated load compensation offset angle, trigonometric functions are used to calculate the upper supply point compensation height to be measured when the mid-span (or cantilever end) of the crane main beam is twisted; When no load: Get the camber of the unloaded main beam; Rated load: Obtaining a first to-be-measured height of the rated load and a second to-be-measured height of the rated load; The rated load main beam compensation upper supply degree is calculated according to the rated load first height to be measured, the rated load second height to be measured and the upper supply point compensation height to be measured; The vertical static deflection at the mid-span when the main beam is twisted is calculated based on the camber of the unloaded main beam and the compensatory camber of the rated-load main beam; When no load: Get the tilting degree of the unloaded cantilever; Rated load: Obtaining a first to-be-measured height of the rated load and a second to-be-measured height of the rated load; The rated load cantilever compensation upwarping degree is calculated according to the rated load first height to be measured, the rated load second height to be measured, the main beam span and the effective cantilever length and the upwarping point compensation height to be measured; The vertical static deflection of the cantilever end when the cantilever end is twisted is calculated according to the unloaded cantilever upwarp and the rated load cantilever compensated upwarp.

2. The method according to claim 1, characterized in that The upper ends of the connection blocks (6) are movably plugged with spring positioning pins (11).

3. The method according to claim 1, characterized in that: A compensating vernier scale is provided on the rear side of the upper end of the base (1).

4. The method according to claim 1, characterized in that: The right end and the front and rear sides of the base (1) are both provided with storage grooves (8).

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