Lifting capacity measuring device, measuring method and lifting equipment

Abstract

This application discloses a lifting capacity measuring device, measuring method, and lifting equipment. The lifting capacity measuring device includes a measuring component and a controller. The measuring component includes a tension ring sensor, a mounting bracket, and a lifting pulley. The upper end of the tension ring sensor and the first end of the mounting bracket are sequentially hinged to the lifting arm along the length of the lifting arm, and the lower end of the tension ring sensor is hinged to the second end of the mounting bracket. The lifting pulley is mounted on the mounting bracket and can be wound around the lifting rope. The controller is communicatively connected to the tension ring sensor and configured to calculate the lifting capacity based on the detection value of the tension ring sensor, the tilt angle of the lifting arm, and the lowering height of the lifting rope, incorporating the tilt angle of the lifting arm into the lifting capacity calculation to improve the accuracy of the lifting capacity measurement.

Description

Technical Field

[0001] This application belongs to the field of hoisting equipment technology, specifically relating to a lifting capacity measuring device, measuring method, and hoisting equipment. Background Technology

[0002] Lifting equipment is a type of mechanical equipment used to raise, move, and lower heavy objects. It is widely used in construction sites, ports, factories, warehouses, and other locations, primarily for handling and loading / unloading heavy items such as steel, precast concrete components, and machinery.

[0003] In construction, changes in lifting capacity directly affect the stability and safety of lifting equipment. Overloading can lead to equipment overturning, equipment damage, and even personal injury. Therefore, real-time access to lifting capacity information helps ensure that lifting equipment operates within safe load limits and avoids potential accidents.

[0004] Currently, tension ring lifting capacity measurement devices are widely used in luffing jib tower cranes. The tension of a single hoisting rope indirectly acts on the tension ring sensor, generating tension. The sensor identifies the deformation of its internal structure, reflecting the weight change of the lifted cargo. However, the luffing motion of a luffing jib tower crane is accompanied by changes in the jib's tilt angle. This causes a change in the tension value on the tension ring sensor, which in turn affects the measurement data and introduces errors in lifting capacity accuracy. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies, this application provides a lifting capacity measuring device, measuring method and lifting equipment, which aims to solve the technical problem that changes in the boom tilt angle will affect the measurement data and cause errors in lifting capacity accuracy.

[0006] To achieve the above objectives, this application provides a lifting capacity measuring device, which includes a measuring component and a controller. The measuring component includes a tension ring sensor, a mounting bracket, and a lifting pulley. The upper end of the tension ring sensor and the first end of the mounting bracket are sequentially hinged to the lifting arm at intervals along the length of the lifting arm, and the lower end of the tension ring sensor is hinged to the second end of the mounting bracket. The lifting pulley is mounted on the mounting bracket and can be wound around the lifting rope. The controller is communicatively connected to the tension ring sensor and configured to calculate the lifting capacity based on the detection value of the tension ring sensor, the tilt angle of the lifting arm, and the lowering height of the lifting rope.

[0007] In this embodiment of the application, calculating the lifting capacity based on the detection value of the tension ring sensor, the tilt angle of the lifting arm, and the lowering height of the lifting rope includes:

[0008] The single rope tension of the lifting rope is determined based on the detection value of the tension ring sensor and the tilt angle of the lifting arm.

[0009] The lifting capacity is determined based on the tension of a single hoisting rope and the height to which the hoisting rope is lowered.

[0010] In this embodiment of the application, determining the single-rope tension of the hoisting rope based on the detection value of the tension ring sensor and the tilt angle of the lifting boom includes:

[0011] The detection value of the tension ring sensor and the tilt angle of the lifting arm are substituted into the first calculation formula to calculate the single rope tension of the lifting rope. The first calculation formula is as follows:

[0012]

[0013] In the formula, F is the tension of a single hoisting rope, N is the detected value of the tension ring sensor, and M... c Let L be the weight of the mounting bracket. c Let L be the distance between the center of gravity of the mounting bracket and the hinge point of the lifting boom. b Let L be the lever arm of the tension ring sensor, γ be the angle between the mounting bracket and the lifting arm, θ be the tilt angle of the lifting arm, and L be the angle between the lifting arm and the lever arm. a Let α be the lever arm of the resultant force of the lifting pulley, and let α be the included angle of the lifting rope.

[0014] In the first embodiment of this application, the lifting rope is used to lift the heavy object, and determining the lifting capacity based on the single rope tension and the lowering height of the lifting rope includes:

[0015] The lifting capacity is calculated by substituting the tension of the single hoisting rope and the lowering height of the hoisting rope into the second calculation formula, whereby the second calculation formula is:

[0016] G = F - g0 × H

[0017] In the formula, G is the lifting weight, F is the single rope tension of the hoisting rope, g0 is the unit weight of the hoisting rope, and H is the lowering height of the hoisting rope.

[0018] In the second embodiment of this application, the lifting capacity measuring device is configured for single-rate lifting, and the lifting capacity measuring device further includes a first hook, which is connected to the lifting rope and used to lift the heavy object;

[0019] The lifting capacity is determined based on the tension of a single hoisting rope and the height to which the hoisting rope is lowered, including:

[0020] The lifting capacity is calculated by substituting the tension of the single hoisting rope and the lowering height of the hoisting rope into the third calculation formula, where the third calculation formula is:

[0021] G = F - g0 × H - g1

[0022] In the formula, G is the lifting capacity, F is the single rope tension of the lifting rope, g0 is the unit weight of the lifting rope, H is the lowering height of the lifting rope, and g1 is the weight of the first hook.

[0023] In the third embodiment of this application, the lifting capacity measuring device is configured for multi-rate lifting, and the lifting capacity measuring device further includes a second hook, the second hook including a hook head and a lifting pulley block, the lifting rope being wound around the lifting pulley block, the hook head being connected to the lifting pulley block and used to lift the heavy object;

[0024] The lifting capacity is determined based on the tension of a single hoisting rope and the height to which the hoisting rope is lowered, including:

[0025] The lifting capacity is calculated by substituting the tension of the single hoisting rope and the lowering height of the hoisting rope into the fourth calculation formula, where the fourth calculation formula is:

[0026] G = F × m - g0 × H × m - g2

[0027] In the formula, G is the lifting capacity, F is the single rope tension of the lifting rope, g0 is the unit weight of the lifting rope, H is the lowering height of the lifting rope, g2 is the weight of the second hook, and m is the ratio of the lifting pulley block.

[0028] In this embodiment, the lifting pulley includes a wheel body, a rotating shaft, a rope guide rod, and two mounting lugs. The wheel body is rotatably connected to the mounting bracket via the rotating shaft. The two mounting lugs are sleeved outside the rotating shaft. The wheel body and the rope guide rod are both located between the two mounting lugs. A limiting channel is formed between the rope guide rod and the wheel body, and the lifting rope is located within the limiting channel.

[0029] Secondly, this application also provides a lifting capacity measurement method, which is applied to the lifting capacity measurement device described above, and includes:

[0030] The lifting capacity is calculated based on the detection value of the tension ring sensor, the tilt angle of the lifting arm, and the lowering height of the lifting rope, and the lifting equipment is stopped if the lifting capacity exceeds the limit.

[0031] In this embodiment of the application, the lifting capacity is calculated based on the detection value of the tension ring sensor, the tilt angle of the lifting arm, and the lowering height of the lifting rope, and the lifting equipment is stopped if the lifting capacity exceeds the limit, including:

[0032] Obtain the initial values ​​of the lowering height of the hoisting rope and the initial values ​​of the tilt angle of the crane boom, respectively.

[0033] When it is determined that the hoisting rope is in an unloaded state, the initial value of the detection value of the tension ring sensor is obtained, and the initial value of the lifting capacity is calculated based on the initial value of the lowering height of the hoisting rope, the initial value of the tilt angle of the crane arm, and the initial value of the detection value of the tension ring sensor.

[0034] When it is determined that the hoisting rope is under load, the real-time value of the detection value of the tension ring sensor is obtained, and the real-time value of the lifting weight is calculated based on the real-time value of the lowering height of the hoisting rope, the real-time value of the tilt angle of the crane arm, and the real-time value of the detection value of the tension ring sensor.

[0035] The actual lifting capacity is calculated based on the initial and real-time lifting capacity values.

[0036] If the actual lifting weight exceeds the preset value, the lifting equipment will be stopped.

[0037] In addition, this application also provides a lifting device, which includes the lifting capacity measuring device as described above.

[0038] Through the above technical solution, the lifting capacity measuring device provided in this application embodiment has the following beneficial effects:

[0039] In the technical solution of this application, the upper end of the tension ring sensor is hinged to the lifting arm, and the lower end of the tension ring sensor is hinged to the second end of the mounting bracket. Both ends of the tension ring sensor are hinged, ensuring uniform force distribution at both ends. The first end of the mounting bracket is hinged to the lifting arm, and the tension ring sensor and the mounting bracket are distributed along the length of the lifting arm. A lifting pulley is mounted on the mounting bracket, and a lifting rope is wound around the lifting pulley. The lifting rope is used to connect to the load. Rotation of the lifting pulley causes the lifting rope to move the load, changing the vertical position of the load to achieve lifting and lowering. Rotation of the lifting arm changes the horizontal position of the load, thus moving the load. A lever structure is formed between the tension ring sensor and the lifting pulley. The tension of the single rope of the lifting rope is transformed through the lever structure and applied to the tension ring sensor.

[0040] The controller communicates with the tension ring sensor, transmitting the sensor's readings to the controller. The controller calculates the lifting capacity based on the sensor's readings, the boom's tilt angle, and the lowering height of the hoisting rope. Incorporating the boom's tilt angle into the calculation significantly improves the accuracy of the lifting capacity measurement. This is because the boom angle directly affects the force distribution applied to the hoisting rope and the lifting capacity measuring device, thus influencing the hoisting equipment's operating status and lifting capacity. Furthermore, this lifting capacity measurement method is applicable to luffing boom hoisting equipment and flat boom hoisting equipment, expanding the device's applicability and making it highly practical for various hoisting applications.

[0041] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0042] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0043] Figure 1 This is a schematic diagram of the lifting weight measuring device according to an embodiment of this application;

[0044] Figure 2 This is a force analysis diagram of the lifting arm in the lifting capacity measuring device according to an embodiment of the present application when it is at the first tilt angle;

[0045] Figure 3 This is a force analysis diagram of the lifting arm in the lifting capacity measuring device according to an embodiment of the present application when it is at the second tilt angle;

[0046] Figure 4 This is a schematic diagram of the connection structure between the lifting rope and the first hook in a lifting weight measuring device according to an embodiment of this application;

[0047] Figure 5 This is a schematic diagram of the connection structure between the lifting rope and the lifting pulley block in a lifting weight measuring device according to an embodiment of this application;

[0048] Figure 6 This is a schematic diagram of the lifting weight measuring device according to another embodiment of this application;

[0049] Figure 7 This is a schematic diagram of the lifting weight measuring device according to another embodiment of this application;

[0050] Figure 8 This is a schematic diagram of the lifting weight measuring device according to another embodiment of this application;

[0051] Figure 9 This is a schematic diagram of the steps of a lifting weight measurement method according to an embodiment of this application.

[0052] Explanation of reference numerals in the attached figures

[0053] 100 Lifting weight measuring device 22 Lifting pulley block

[0054] 11 Tension ring sensor 221 Moving wheel

[0055] 12 Mounting brackets 222 Mounting plates

[0056] 121 First end 31 First fixed wheel

[0057] 122 Second end 32 Second fixed wheel

[0058] 13 Lifting pulley 40 First hook

[0059] 131 wheel body 50 lifting boom

[0060] 132 Rotating shaft 51 First ear plate

[0061] 133 Rope guide bar 52 Second ear plate

[0062] 134 Install ear plate 53 Upper chord

[0063] 20 Second hook 54 Lower chord

[0064] 21 Hook 60 Lifting Rope Detailed Implementation

[0065] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0066] The lifting capacity measuring device, measuring method, and lifting equipment of this application are described below with reference to the accompanying drawings.

[0067] like Figures 1 to 8 As shown, this application provides a lifting capacity measuring device 100, which includes a measuring component and a controller. The measuring component includes a tension ring sensor 11, a mounting bracket 12, and a lifting pulley 13. The upper end of the tension ring sensor 11 and the first end 121 of the mounting bracket 12 are sequentially hinged to the lifting arm 50 at intervals along the length direction of the lifting arm 50, and the lower end of the tension ring sensor 11 is hinged to the second end 122 of the mounting bracket 12. The lifting pulley 13 is disposed on the mounting bracket 12 and can be wound around the lifting rope 60. The controller is communicatively connected to the tension ring sensor 11 and configured to calculate the lifting capacity based on the detection value of the tension ring sensor 11, the tilt angle of the lifting arm 50, and the lowering height of the lifting rope 60.

[0068] The upper end of the tension ring sensor 11 is hinged to the lifting arm 50, and the lower end of the tension ring sensor 11 is hinged to the second end 122 of the mounting bracket 12. Both ends of the tension ring sensor 11 are hinged, ensuring uniform force distribution. The first end 121 of the mounting bracket 12 is hinged to the lifting arm 50, and the tension ring sensor 11 and the mounting bracket 12 are distributed along the length of the lifting arm 50. A lifting pulley 13 is mounted on the mounting bracket 12, and a lifting rope 60 is wound around the lifting pulley 13. The lifting rope 60 is used to connect to the load. Rotation of the lifting pulley 13 causes the lifting rope 60 to move the load, changing the vertical position of the load to achieve lifting and lowering. Rotation of the lifting arm 50 changes the horizontal position of the load, thus moving the load. The tension ring sensor 11 and the lifting pulley 13 form a lever structure. The tension of the single rope 60 is transformed by the lever structure and applied to the tension ring sensor 11.

[0069] The controller communicates with the tension ring sensor 11, and the detection value of the tension ring sensor 11 is transmitted to the controller. The controller calculates the lifting capacity based on the detection value of the tension ring sensor 11, the tilt angle of the lifting boom 50, and the lowering height of the lifting rope 60. Incorporating the tilt angle of the lifting boom 50 into the lifting capacity calculation significantly improves the accuracy of the lifting capacity measurement. This is because the angle of the lifting boom 50 directly affects the force distribution applied to the lifting rope 60 and the lifting capacity measuring device 100, thereby affecting the working state and lifting capacity of the lifting equipment. Furthermore, the lifting capacity measurement method is applicable to boom lifting equipment and flat boom lifting equipment, expanding the applicability of the lifting capacity measuring device 100 and making it highly practical in various types of lifting equipment.

[0070] The hoisting rope 60 can be a steel wire rope. Steel wire ropes have high tensile strength and can withstand large loads, making them suitable for lifting and moving heavy objects. The outer layer of the steel wire rope is usually specially treated to resist wear and corrosion, extending its service life. Depending on the specific circumstances, the hoisting rope 60 can also be other types of rope.

[0071] In this embodiment, calculating the lifting capacity based on the detection value of the tension ring sensor 11, the tilt angle of the lifting arm 50, and the lowering height of the lifting rope 60 includes:

[0072] The single rope tension of the lifting rope 60 is determined based on the detection value of the tension ring sensor 11 and the tilt angle of the lifting arm 50.

[0073] Force analysis of the lifting capacity measuring device 100 is performed. According to the torque balance formula, the torque of the tension ring sensor 11 is equal to the torque of the lifting pulley 13 plus the torque of the mounting bracket 12. The torque of the lifting pulley 13 is the resultant force of the lifting pulley 13 multiplied by the lever arm of the lifting pulley 13. The resultant force of the lifting pulley 13 is related to the force exerted by the lifting rope 60 on the lifting pulley 13. Therefore, the single-rope tension of the lifting rope 60 can be calculated based on the torque balance formula and the formula for the resultant force of the lifting pulley 13.

[0074] The lifting capacity is determined based on the single rope tension of the hoisting rope 60 and the lowering height of the hoisting rope 60.

[0075] The lifting capacity can be obtained by subtracting the weight of the hoisting rope 60 from its lifting force. The lifting force of the hoisting rope 60 can be determined from the tension of a single rope. The weight of the hoisting rope 60 is equal to the lowering height of the hoisting rope 60 multiplied by its unit weight.

[0076] In this embodiment, determining the single-rope tension of the lifting rope 60 based on the detection value of the tension ring sensor 11 and the tilt angle of the lifting boom 50 includes:

[0077] The detection value of the tension ring sensor 11 and the tilt angle of the lifting boom 50 are substituted into the first calculation formula to calculate the single rope tension of the lifting rope 60. The first calculation formula is as follows:

[0078]

[0079] In the formula, F is the single rope tension of the hoisting rope 60, N is the detection value of the tension ring sensor 11, and M... c Let L be the weight of the mounting bracket 12. c Let L be the distance between the center of gravity of the mounting bracket 12 and the hinge point of the lifting boom 50. b Let γ be the lever arm of the tension ring sensor 11, γ be the angle between the mounting bracket 12 and the lifting arm 50, θ be the tilt angle of the lifting arm 50, and L be the angle between the mounting bracket 12 and the lifting arm 50. a Let α be the lever arm of the resultant force of the lifting pulley 13, and let α be the included angle of the lifting rope 60.

[0080] Please see Figure 2 and Figure 3 , Figure 2 The middle crane boom 50 is at the first tilt angle, which is 0°. Figure 3 The middle crane boom 50 is at the second tilt angle, which is 60°.

[0081] Force analysis is performed on the lifting capacity measuring device 100.

[0082] According to the torque balance formula: N×L b=F 合力 ×L a +M c ×L c ×cos(γ+θ)

[0083] Wherein, torque = force acting on the object × lever arm, and lever arm refers to the perpendicular distance between the line of action of the force and the axis of rotation 132 (or the fulcrum). F 合力 Let the resultant force of the lifting pulley 13 be the resultant force.

[0084] (N×L b ) represents the torque of the tension ring sensor 11, which is the product of the detected value of the tension ring sensor 11 and the lever arm of the tension ring sensor 11. (F) 合力 ×L a The torque of the lifting pulley 13 is F, which is the resultant force F of the lifting pulley 13. 合力 The product of the lever arm of the resultant force with the lifting pulley 13. (M) c ×L c ×cos(γ+θ)) is the torque of the mounting bracket 12, where (L c ×cos(γ+θ)) is the lever arm of the mounting bracket 12, that is, the weight M of the mounting bracket 12. c The product of the lever arm of the mounting bracket 12. The tilt angle θ of the lifting boom 50, i.e., the angle between the lifting boom 50 and the horizontal plane, is obtained using a tilt sensor or angle sensor.

[0085] Formula for calculating the resultant force of lifting pulley 13: F 合力 = 2 × F × cos(α / 2)

[0086] Where F is the tension of a single rope of the hoisting rope 60, and α is the included angle of the hoisting rope 60. (F×cos(α / 2)) is the force exerted by the tension of the single rope of the hoisting rope 60 on the hoisting pulley 13, and the resultant force of the hoisting pulley 13 is equal to twice the force exerted by the single rope tension on the hoisting pulley 13.

[0087] Combining the torque balance formula with the resultant force calculation formula of the lifting pulley 13, we can obtain:

[0088]

[0089] Therefore, the first calculation formula can be derived:

[0090] According to the first calculation formula, the single-rope tension of the hoisting rope 60 can be calculated. The single-rope tension of the hoisting rope 60 is generated when the hoisting equipment lifts a heavy object, applied through an engine, winch, or other hoisting device. Furthermore, the tilt angle of the lifting boom 50 is taken into account during the calculation of the single-rope tension of the hoisting rope 60, making the calculation result more accurate and thus improving the reliability of the lifting capacity measuring device 100. The tilt angle θ of the lifting boom 50 can be measured by an angle sensor.

[0091] L a L b L c The unit is millimeters (mm), and the units for γ, θ, and α are angles (°). The unit for the single rope tension F is tons (t), and the weight M of the mounting bracket 12 is... c The unit is tons (t). To facilitate subsequent calculations of lifting capacity, the unit of the single rope tension F is set to tons, and gravitational acceleration is omitted.

[0092] In the first embodiment of this application, the lifting rope 60 is used to lift heavy objects. The lifting rope 60 can be directly tied to the heavy objects to lift them. The lifting rope 60 can also be equipped with a hook at its end, which hooks the heavy objects to lift them. The hook can include a pulley block to achieve multiple lifting ratios.

[0093] The lifting capacity is determined based on the single-rope tension of the hoisting rope 60 and the lowering height of the hoisting rope 60, including:

[0094] Substitute the single-rope tension of the hoisting rope 60 and the lowering height of the hoisting rope 60 into the second calculation formula to obtain the lifting capacity. The second calculation formula is as follows:

[0095] G = F - g0 × H

[0096] In the formula, G is the lifting weight, F is the single rope tension of the hoisting rope 60, g0 is the unit weight of the hoisting rope 60, and H is the lowering height of the hoisting rope 60.

[0097] g0 is set as the unit weight of the hoisting rope 60, that is, g0 is the weight of a unit length of the hoisting rope 60. H is set as the lowering height of the hoisting rope 60. The lowering height of the hoisting rope 60 can be measured by a height sensor. It can also be obtained by measuring the number of rotations of the pulley and multiplying the number of rotations by the circumference of the pulley.

[0098] (g0×H) represents the weight of the lowered hoisting rope 60, which is the product of the unit weight of the hoisting rope 60 and the lowering height of the hoisting rope 60. The single-rope tension of the hoisting rope 60 minus its weight equals the lifting capacity, allowing for the calculation of the lifting capacity. The single-rope tension of the hoisting rope 60 is the total force borne by the hoisting rope 60 in the hoisting equipment. Subtracting the weight of the hoisting rope 60 itself yields the actual lifting capacity acting on the object being lifted. In actual operation, the hoisting rope 60 is not a lightweight object; its weight constitutes a certain proportion of the overall tension. Therefore, subtracting the weight of the hoisting rope 60 from the single-rope tension is necessary to ensure that the result we obtain is the effective force truly applied to the heavy object. Ignoring the weight of the hoisting rope 60 may lead to errors in judging the lifting capacity, resulting in safety hazards in actual operation. Therefore, deducting the weight of the hoisting rope 60 from its single-rope tension yields a precise lifting capacity value, which not only provides an important basis for safe operation but also helps optimize the design and operational efficiency of the hoisting equipment. Through scientific calculations and reasonable load management, operational efficiency can be maximized, equipment failure rates reduced, and the safety of operators ensured.

[0099] In the second embodiment of this application, please refer to Figure 4 The lifting capacity measuring device 100 is configured for single-rate lifting, and also includes a first hook 40, which is connected to the lifting rope 60 and used to lift the heavy object. By setting the first hook 40 to connect with and support the heavy object, the heavy object is prevented from falling off, making the movement of the heavy object more stable and reliable, and improving the safety of the heavy object handling process.

[0100] The lifting capacity is determined based on the single-rope tension of the hoisting rope 60 and the lowering height of the hoisting rope 60, including:

[0101] Substituting the single-rope tension of the hoisting rope 60 and the lowering height of the hoisting rope 60 into the third calculation formula, the lifting capacity is calculated and obtained. The third calculation formula is as follows:

[0102] G = F - g0 × H - g1

[0103] In the formula, G is the lifting capacity, F is the single rope tension of the lifting rope 60, g0 is the unit weight of the lifting rope 60, H is the lowering height of the lifting rope 60, and g1 is the weight of the first hook 40.

[0104] (g0×H) represents the weight of the lowered hoisting rope 60, which is the product of the unit weight of the hoisting rope 60 and the lowering height of the hoisting rope 60. g1 represents the weight of the first hook 40. The lifting capacity can be calculated by subtracting the weight of the hoisting rope 60 from the single-rope tension of the hoisting rope 60, and then subtracting the weight of the first hook 40. The single-rope tension of the hoisting rope 60 is the total force borne by the hoisting rope 60 in the hoisting equipment. Subtracting the weight of the hoisting rope 60 itself and the weight of the first hook 40 gives the actual lifting capacity acting on the object being lifted. Although the hook may be relatively small compared to the heavy object, its weight is still significant in high-intensity lifting operations. Deducting the weight of the first hook 40 from the tension improves the accuracy of the obtained lifting capacity value.

[0105] In the third embodiment of this application, please refer to Figure 5 The lifting capacity measuring device 100 is configured for multi-rate lifting, and also includes a second hook 20. The second hook 20 includes a hook head 21 and a lifting pulley block 22. The lifting rope 60 is wound around the lifting pulley block 22. The hook head 21 is connected to the lifting pulley block 22 and used to lift the heavy object. By setting up the lifting pulley block 22, lifting efficiency can be significantly improved and labor intensity during operation can be reduced. By using the lifting pulley block 22, the force applied to the heavy object is distributed, thereby amplifying the force. For example, in a pulley block connected by two ropes, only half the force is actually required to lift the heavy object. This is because the moving pulley and the fixed pulley work together to distribute the weight of the heavy object to multiple ropes. Therefore, the required force is significantly reduced, making the operation more labor-saving. When the force is distributed, the overall stability and safety of the lifting equipment are enhanced. The lifting pulley block 22 reduces the risk of rope slippage or breakage caused by excessive force applied in a single rope, helping to prevent accidents.

[0106] The lifting capacity is determined based on the single-rope tension of the hoisting rope 60 and the lowering height of the hoisting rope 60, including:

[0107] Substituting the single-rope tension of the hoisting rope 60 and the lowering height of the hoisting rope 60 into the fourth calculation formula, the lifting capacity is calculated and obtained. The fourth calculation formula is:

[0108] G = F × m - g0 × H × m - g2

[0109] In the formula, G is the lifting capacity, F is the single rope tension of the lifting rope 60, g0 is the unit weight of the lifting rope 60, H is the lowering height of the lifting rope 60, g2 is the weight of the second hook 20, and m is the ratio of the lifting pulley block 22.

[0110] like Figure 5As shown, the second hook 20 includes a hook head 21 and a lifting pulley assembly 22. The lifting pulley assembly 22 is connected to the hook head 21, and the lifting pulley assembly 22 and the hook head 21 move together. The lifting pulley assembly 22 may include three movable pulleys 221 and a mounting plate 222. The three movable pulleys 221 are rotatably mounted on the mounting plate 222. In addition, the lifting capacity measuring device 100 also includes a first fixed pulley 31 and a second fixed pulley 32, which are used to change the direction of the lifting rope 60. The lifting rope 60 is wound sequentially around the first fixed pulley 31, two movable pulleys 221 in the lifting pulley assembly 22, the second fixed pulley 32, and another movable pulley 221 in the lifting pulley assembly 22. Figure 5 The lifting pulley block 22 has a ratio of 4. The ratio of a pulley block refers to the ratio between the applied force and the weight of the load when using the pulley block. Ideally, the ratio of the pulley block equals the number of effective ropes supporting the load. For example... Figure 5 As shown, the lifting pulley block 22 has four lifting ropes 60 supporting a hook 21. The lifting pulley block 22 has a multiplier of 4, which means that the applied force is one-quarter of the weight of the object.

[0111] (F×m) represents the total lifting force of the hoisting rope 60, which is the product of the single rope tension of the hoisting rope 60 and the ratio of the hoisting pulley block 22. (g0×H×m) represents the total weight of the lowered hoisting rope 60, which is the product of the unit weight of the hoisting rope 60, the lowering height of the hoisting rope 60, and the ratio of the hoisting pulley block 22. Here, the lowering height H of the hoisting rope 60 is the lowering height of a single section of the hoisting rope 60, (g0×H) represents the weight of the lowered single section of the hoisting rope 60, and (g0×H×m) represents the total weight of the lowered hoisting rope 60. g2 is the weight of the second hook 20, which consists of the weight of the hook head 21 and the hoisting pulley block 22. Subtracting the weight of the hoisting pulley block 22 from the tension can further improve the accuracy of the obtained lifting capacity value.

[0112] Substituting the first calculation formula into the fourth calculation formula yields:

[0113]

[0114] Therefore, the lifting capacity can be calculated based on the detection value of the tension ring sensor 11, the tilt angle of the lifting arm 50, and the lowering height of the lifting rope 60. The lifting capacity G has a multivariate functional relationship with the detection value N of the tension ring sensor 11, the tilt angle θ of the lifting arm 50, and the lowering height H of the lifting rope 60, thus establishing a nonlinear relationship between the lifting capacity G and the detection value N of the tension ring sensor 11.

[0115] It is understandable that the third calculation formula mentioned above can also be regarded as the case where the ratio m of the lifting pulley block 22 in the second hook 20 in the fourth calculation formula is 1. That is to say, the first hook 40 can also include the hook head 21 and the lifting pulley block 22. The lifting pulley block 22 does not have the lifting rope 60 wrapped around it, and the lifting rope 60 is directly fixedly connected to the first hook 40.

[0116] In this embodiment, the lifting pulley 13 includes a wheel body 131, a rotating shaft 132, a rope guide bar 133, and two mounting lugs 134. The wheel body 131 is rotatably connected to the mounting bracket 12 via the rotating shaft 132. The two mounting lugs 134 are sleeved outside the rotating shaft 132. The wheel body 131 and the rope guide bar 133 are both located between the two mounting lugs 134. A limiting channel is formed between the rope guide bar 133 and the wheel body 131, and the lifting rope 60 is located within the limiting channel.

[0117] The wheel 131 is rotatably connected to the mounting bracket 12 via a rotating shaft 132, allowing the wheel 131 to rotate relative to the mounting bracket 12 around the rotating shaft 132. Two mounting lugs 134 are fitted over the rotating shaft 132, and are located on opposite sides of the wheel 131. The wheel 131 and the rope guide 133 are both located between the two mounting lugs 134. The rope guide 133 is spaced apart from the wheel 131, forming a limiting channel between them. The lifting rope 60 is located within this limiting channel, thus preventing the lifting rope 60 from falling off and improving reliability during the lifting process.

[0118] The number of rope-stopping rods 133 can be two or more, which makes the safety and reliability of the hoisting rope 60 higher during use.

[0119] Specifically, the boom 50 includes an upper chord 53, a lower chord 54, a first lug 51, and a second lug 52. The first lug 51 and the second lug 52 can be installed on either the upper chord 53 or the lower chord 54. Figure 1 As shown, the first ear plate 51 and the second ear plate 52 are mounted on the upper chord 53. The upper end of the tension ring sensor 11 is hinged to the first ear plate 51, and the first end 121 of the mounting bracket 12 is hinged to the second ear plate 52. Figure 6 As shown, the upper end of the tension ring sensor 11 can also be hinged to the second ear plate 52, and the first end 121 of the mounting bracket 12 is hinged to the first ear plate 51.

[0120] like Figure 7 As shown, the first ear plate 51 and the second ear plate 52 can also be installed on the lower chord 54. The upper end of the tension ring sensor 11 is hinged to the first ear plate 51, and the first end 121 of the mounting bracket 12 is hinged to the second ear plate 52.

[0121] like Figure 8 As shown, the first ear plate 51 and the second ear plate 52 are mounted on the lower chord 54, the upper end of the tension ring sensor 11 is hinged to the second ear plate 52, and the first end 121 of the mounting bracket 12 is hinged to the first ear plate 51.

[0122] As described above, the lifting capacity measuring device 100 in this application has a flexible and varied structure depending on the design of the hoisting equipment sheave system. This flexible and varied design enables the measuring device to adapt to various working environments and operational requirements, thus allowing it to be widely used in multiple fields.

[0123] Secondly, this application also provides a lifting capacity measurement method, which is applied to the lifting capacity measuring device 100 as described above, and includes:

[0124] The lifting capacity is calculated based on the detection value of the tension ring sensor 11, the tilt angle of the lifting arm 50, and the lowering height of the lifting rope 60, and the lifting equipment is stopped if the lifting capacity exceeds the limit.

[0125] Taking the tilt angle of the boom 50 into account can significantly improve the accuracy of lifting capacity measurement. This is because the angle of the boom 50 directly affects the force distribution applied to the lifting rope 60 and the lifting capacity measuring device 100, thereby affecting the working condition and lifting capacity of the lifting equipment.

[0126] A preset value (e.g., maximum permissible lifting capacity) is set based on the rated load and safety standards of the lifting equipment. The controller continuously monitors whether the calculated lifting capacity exceeds the preset value. If the detected lifting capacity exceeds the preset value, corresponding control measures are immediately triggered, automatically stopping the lifting equipment to prevent damage or safety accidents caused by overload. Simultaneously, an alarm system can be triggered to notify operators for manual inspection and safety assessment. Through these methods, the safety of lifting equipment operation can be effectively improved, the risk of overload reduced, and the smooth progress of operations ensured.

[0127] In the embodiments of this application, please refer to Figure 9 The lifting capacity is calculated based on the detection value of the tension ring sensor 11, the tilt angle of the lifting arm 50, and the lowering height of the lifting rope 60. If the lifting capacity exceeds the limit, the lifting equipment is stopped.

[0128] Step S10: Obtain the initial value of the lowering height of the hoisting rope 60 and the initial value of the tilt angle of the lifting boom 50, respectively.

[0129] The initial value of the lowering height of the hoisting rope 60 is obtained by the height sensor, and the initial value of the tilt angle of the boom 50 is obtained by the angle sensor. The tilt angle of the boom 50 refers to the angle between the boom 50 and the horizontal plane.

[0130] Step S20: When it is determined that the lifting rope is in an unloaded state, the initial value of the detection value of the tension ring sensor is obtained, and the initial value of the lifting weight is calculated based on the initial value of the lowering height of the lifting rope, the initial value of the tilt angle of the lifting arm, and the initial value of the detection value of the tension ring sensor.

[0131] It is confirmed that the hoisting rope is in an unloaded state, meaning it is not carrying any weight. With the hoisting rope in an unloaded state, the initial value N1 of the tension ring sensor is obtained. Based on the initial value H1 of the hoisting rope's lowering height, the initial value θ1 of the boom's tilt angle, and the initial value N1 of the tension ring sensor, the initial value G1 of the lifting capacity is calculated. The specific calculation method and related formulas for the lifting capacity are described in detail above and will not be repeated here.

[0132] Step S30: When it is determined that the lifting rope is under load, the real-time value of the detection value of the tension ring sensor is obtained in real time, and the real-time value of the lifting weight is calculated based on the real-time value of the lowering height of the lifting rope, the real-time value of the tilt angle of the lifting arm and the real-time value of the detection value of the tension ring sensor.

[0133] The load is connected to the lifting rope, and the real-time value N2 of the tension ring sensor is acquired while the lifting rope is under load. Furthermore, the real-time value G2 of the lifting weight is calculated based on the real-time value H2 of the lifting rope's lowering height, the real-time value θ2 of the crane boom's tilt angle, and the real-time value N2 of the tension ring sensor.

[0134] Step S40: Calculate the actual lifting weight based on the initial lifting weight and the real-time lifting weight.

[0135] The difference between the initial lifting weight G1 and the real-time lifting weight G2 is the actual lifting weight G.

[0136] In other words, G = G2 - G1.

[0137] In step S50, if the actual lifting weight is greater than the preset value, the lifting equipment is stopped.

[0138] If the actual lifting weight detected exceeds the preset value, the corresponding control measures will be triggered immediately to automatically stop the lifting equipment, preventing damage to the lifting equipment or safety accidents caused by overload. This improves the safety of the lifting equipment, effectively reduces the risk of overload, and ensures the smooth progress of the operation.

[0139] The lifting capacity measuring device 100 and lifting capacity measuring method in this application can produce the following effects:

[0140] 1. The tension of the single hoisting rope 60 is transformed by the lever structure and applied to the tension ring sensor 11. By changing the structure, the lever value changes, ensuring that the force on the lifting capacity measuring device 100 is within the measuring range. The lifting capacity measuring device 100 is highly versatile, capable of meeting the operational needs of tower cranes with different lifting capacities, and has a short product procurement cycle.

[0141] 2. By constructing a lifting capacity calculation model and collaboratively calling the initial data of tension ring sensor 11, tilt sensor, and height sensor, the initial value of the lifting capacity is determined, and the lifting capacity of the hoisting equipment is quickly calibrated, resulting in high weight accuracy after calibration.

[0142] 3. The entire lifting weight measurement method can be completed quickly by just one person, the lifting equipment operator, without the need for additional weights. It can complete the measurement quickly and in a short time.

[0143] 4. The complete set of lifting capacity measurement methods is applicable to luffing jib tower cranes and flat-top luffing jib tower cranes, and can also meet the needs of flat-top tower cranes. The method has a wide range of applications.

[0144] In addition, this application also provides a lifting device, which includes the lifting capacity measuring device 100 as described above. Since the lifting device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0145] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0146] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0147] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0148] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A lifting capacity measuring device, characterized in that, The lifting capacity measuring device includes: The measuring assembly includes a tension ring sensor (11), a mounting bracket (12), and a lifting pulley (13). The upper end of the tension ring sensor (11) and the first end (121) of the mounting bracket (12) are sequentially hinged to the lifting arm (50) at intervals along the length direction of the lifting arm (50), and the lower end of the tension ring sensor (11) is hinged to the second end (122) of the mounting bracket (12). The lifting pulley (13) is provided on the mounting bracket (12) and can be wound around the lifting rope (60). The controller is communicatively connected to the tension ring sensor (11) and configured to: The lifting capacity is calculated based on the detection value of the tension ring sensor (11), the tilt angle of the lifting arm (50), and the lowering height of the lifting rope (60); The calculation of the lifting capacity based on the detection value of the tension ring sensor (11), the tilt angle of the lifting arm (50), and the lowering height of the lifting rope (60) includes: The single rope tension of the lifting rope (60) is determined based on the detection value of the tension ring sensor (11) and the tilt angle of the lifting arm (50); The determination of the single-rope tension of the lifting rope (60) based on the detection value of the tension ring sensor (11) and the tilt angle of the lifting arm (50) includes: The detection value of the tension ring sensor (11) and the tilt angle of the lifting arm (50) are substituted into the first calculation formula to calculate the single rope tension of the lifting rope (60), wherein the first calculation formula is: In the formula, F is set as the tension of a single hoisting rope (60). Let the detected value of the tension ring sensor (11) be set. Let the weight of the mounting bracket (12) be the weight. Let the distance be the distance between the center of gravity of the mounting bracket (12) and the hinge point of the lifting arm (50). Let the lever arm of the tension ring sensor (11) be defined. Let the angle between the mounting bracket (12) and the lifting boom (50) be defined. Let the tilt angle of the boom (50) be defined. Let the resultant force of the lifting pulley (13) be the lever arm. Let it be the included angle of the hoisting rope (60).

2. The lifting capacity measuring device according to claim 1, characterized in that, The calculation of the lifting capacity based on the detection value of the tension ring sensor (11), the tilt angle of the lifting arm (50), and the lowering height of the lifting rope (60) includes: The lifting capacity is determined based on the single rope tension of the hoisting rope (60) and the lowering height of the hoisting rope (60).

3. The lifting capacity measuring device according to claim 2, characterized in that, The lifting rope (60) is used to lift heavy objects. Determining the lifting capacity based on the single rope tension of the lifting rope (60) and the lowering height of the lifting rope (60) includes: The lifting capacity is calculated by substituting the single rope tension of the hoisting rope (60) and the lowering height of the hoisting rope (60) into the second calculation formula, whereby the second calculation formula is: G=F-g0×H In the formula, G is the lifting weight, F is the single rope tension of the lifting rope (60), g0 is the unit weight of the lifting rope (60), and H is the lowering height of the lifting rope (60).

4. The lifting capacity measuring device according to claim 2, characterized in that, The lifting capacity measuring device (100) is configured for single-rate lifting, and the lifting capacity measuring device (100) further includes a first hook (40), which is connected to the lifting rope (60) and used to lift heavy objects; The determination of the lifting capacity based on the single rope tension of the hoisting rope (60) and the lowering height of the hoisting rope (60) includes: The lifting capacity is calculated by substituting the single rope tension of the hoisting rope (60) and the lowering height of the hoisting rope (60) into the third calculation formula. The third calculation formula is as follows: G = F - g0 × H - g1 In the formula, G is the lifting weight, F is the single rope tension of the lifting rope (60), g0 is the unit weight of the lifting rope (60), H is the lowering height of the lifting rope (60), and g1 is the weight of the first hook (40).

5. The lifting capacity measuring device according to claim 2, characterized in that, The lifting capacity measuring device (100) is configured for multi-rate lifting, and the lifting capacity measuring device (100) also includes a second hook (20), the second hook (20) includes a hook head (21) and a lifting pulley block (22), the lifting rope (60) is wound around the lifting pulley block (22), the hook head (21) is connected to the lifting pulley block (22) and used to lift heavy objects; The determination of the lifting capacity based on the single rope tension of the hoisting rope (60) and the lowering height of the hoisting rope (60) includes: The lifting capacity is calculated by substituting the single rope tension of the hoisting rope (60) and the lowering height of the hoisting rope (60) into the fourth calculation formula. The fourth calculation formula is as follows: G = F × m - g0 × H × m - g2 In the formula, G is the lifting weight, F is the single rope tension of the lifting rope (60), g0 is the unit weight of the lifting rope (60), H is the lowering height of the lifting rope (60), g2 is the weight of the second hook (20), and m is the ratio of the lifting pulley block (22).

6. The lifting capacity measuring device according to any one of claims 1 to 5, characterized in that, The lifting pulley (13) includes a wheel body (131), a rotating shaft (132), a rope guide rod (133), and two mounting lugs (134). The wheel body (131) is rotatably connected to the mounting bracket (12) through the rotating shaft (132). The two mounting lugs (134) are sleeved on the rotating shaft (132). The wheel body (131) and the rope guide rod (133) are both located between the two mounting lugs (134). A limiting channel is formed between the rope guide rod (133) and the wheel body (131). The lifting rope (60) is located within the limiting channel.

7. A method for measuring lifting capacity, characterized in that, The lifting capacity measurement method is applied to the lifting capacity measuring device according to any one of claims 1 to 6, and includes: The lifting capacity is calculated based on the detection value of the tension ring sensor (11), the tilt angle of the lifting arm (50) and the lowering height of the lifting rope (60), and the lifting equipment is stopped if the lifting capacity exceeds the limit.

8. The lifting capacity measurement method according to claim 7, characterized in that, The method of calculating the lifting capacity based on the detection value of the tension ring sensor (11), the tilt angle of the lifting arm (50), and the lowering height of the lifting rope (60), and controlling the stopping of the lifting equipment when the lifting capacity exceeds the limit, includes: The initial values ​​of the lowering height of the hoisting rope (60) and the initial values ​​of the tilt angle of the boom (50) are obtained respectively. When it is determined that the hoisting rope (60) is in an unloaded state, the initial value of the detection value of the tension ring sensor (11) is obtained, and the initial value of the lifting weight is calculated based on the initial value of the lowering height of the hoisting rope (60), the initial value of the tilt angle of the lifting arm (50) and the initial value of the detection value of the tension ring sensor (11). When it is determined that the lifting rope (60) is under load, the real-time value of the detection value of the tension ring sensor (11) is obtained in real time, and the real-time value of the lifting weight is calculated based on the real-time value of the lowering height of the lifting rope (60), the real-time value of the tilt angle of the lifting arm (50) and the real-time value of the detection value of the tension ring sensor (11). The actual lifting capacity is calculated based on the initial and real-time lifting capacity values. If the actual lifting weight exceeds the preset value, the lifting equipment will be stopped.

9. A lifting device, characterized in that, The lifting equipment includes the lifting capacity measuring device as described in any one of claims 1 to 6.

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