Work bucket weighing device, method, system, engineering machinery and readable storage medium

Abstract

This invention relates to weighing equipment for engineering machinery, and provides a working bucket weighing device, including a swing mechanism mounting base, a swing mechanism, a weighing sensor, and a working bucket mounting base for connecting the working bucket. The swing mechanism mounting base is connected to the swing mechanism, and the weighing sensor is mounted on one end of the output shaft of the swing mechanism. The working bucket mounting base is rotatably connected to the weighing sensor, and the axis of rotation between the two is perpendicular to the central axis of the output shaft. The swing mechanism mounting base is provided with a radial bearing structure for bearing the radial load of the working bucket mounting base. Furthermore, this invention also provides a working bucket weighing method, a weighing system, engineering machinery, and a readable storage medium. The working bucket weighing device of this invention can effectively eliminate the influence of off-center loading of the working bucket for weighing, ensuring the accuracy of the weighing results.

Description

Technical Field

[0001] This invention relates to weighing equipment for construction machinery, specifically to a weighing device for a work hopper. It also relates to a weighing method for a work hopper, a weighing system, construction machinery, and a readable storage medium. Background Technology

[0002] Work buckets are widely used in engineering machinery, such as aerial work platforms and emergency firefighting equipment. Taking aerial work platforms as an example, the main function of the work bucket is to provide a working space and place tools for workers at height. As a personnel-carrying device, the work bucket needs to have a specified rated load capacity during design and manufacturing. When the platform is overloaded, various emergencies can easily occur, creating safety hazards. At the same time, load constraints also limit the maximum working range of the aerial work platform. When the work bucket's own weight and load are large, in order to prevent the entire vehicle from tipping over, it is necessary to increase the counterweight or reduce the extension distance of the boom, which greatly limits the working efficiency of the aerial work platform.

[0003] The following are some existing methods for weighing the work bucket of aerial work platforms:

[0004] 1. Referring to Chinese Patent Publication (CN112723268A), the working bucket is lifted by the extension and retraction of the actuating cylinder. The pressure in the rodless chamber of the actuating cylinder changes with the load of the working bucket and the angle of the actuating arm. This change can be calculated by a reasonable mathematical formula. The load of the working bucket can be calculated by simply detecting the pressure in the rodless chamber of the actuating cylinder and the angle of the actuating arm.

[0005] However, starting and stopping the actuator boom will cause large fluctuations in the pressure of the rodless chamber of the hydraulic cylinder. The pressure of the rodless chamber will fluctuate greatly due to the actual operating conditions of the equipment, resulting in low accuracy of the measurement results and the inability to eliminate the influence of off-center loading. That is, the same weight placed in different positions in the working bucket will yield different measurement results.

[0006] 2. Referring to Chinese Patent Publication (CN201983846U), the working bucket is connected to the upper part of the support shaft, receiving the entire weight from the working bucket. The pressure plate in the middle of the support shaft presses against the sensor through a thrust bearing. The lower end of the support shaft is installed in the bushing of the platform bracket. A pair of rolling ball bearings are installed between the shaft and the bushing. When the heavy object in the working bucket causes an off-center load, the upper and lower rolling ball bearings will bear radial forces of equal magnitude and opposite direction. The torque formed by this pair of forces will cancel out the bending moment caused by the off-center load. In the vertical direction, the bearings do not bear any axial force. Therefore, all forces in the vertical direction are borne by the load cell, which can accurately detect the load in the working bucket.

[0007] However, in this design, the load within the working platform is first transferred to the load cell via a thrust bearing. Below the thrust bearing are a pair of rolling ball bearings used to counteract the off-center load. When the working bucket deforms due to the load, the off-center load will affect the weighing mechanism, causing uneven force on the left and right sides of the thrust bearing. This results in the load cell still bearing a portion of the off-center load, leading to inaccurate measurements. In extreme cases, even without the bearings, the working bucket can maintain structural stability. Therefore, this design cannot strictly guarantee that the load cell is unaffected by off-center loads. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a working bucket weighing device that can effectively eliminate the influence of uneven loading of the working bucket on the weighing and ensure the accuracy of the weighing results.

[0009] The technical problem that this invention also aims to solve is to provide a method for weighing a working bucket, which can accurately measure the actual load of the working bucket and effectively prevent overloading.

[0010] Correspondingly, the present invention provides a working bucket weighing system that can accurately measure the actual load of the working bucket and effectively prevent overloading.

[0011] The technical problem to be further solved by the present invention is to provide an engineering machine whose weighing system can accurately monitor the actual load of the working bucket, thereby improving safety during operation.

[0012] Furthermore, the present invention provides a readable storage medium that can be machine-executed to accurately measure the actual load of the work bucket during application, effectively preventing overloading and providing operational safety.

[0013] To solve the above-mentioned technical problems, the present invention provides a working bucket weighing device, including a swing mechanism mounting base, a swing mechanism, a weighing sensor, and a working bucket mounting base for connecting the working bucket. The swing mechanism mounting base is connected to the swing mechanism, the weighing sensor is mounted on one end of the output shaft of the swing mechanism, the working bucket mounting base is rotatably connected to the weighing sensor, and the axis of rotation between the two is perpendicular to the central axis of the output shaft. The swing mechanism mounting base is provided with a radial bearing structure for bearing the radial load of the working bucket mounting base.

[0014] In a preferred embodiment, the radial bearing structure includes a rolling bearing and a bearing mounting base for mounting the rolling bearing. The bearing mounting base is connected to the swing mechanism mounting base. The working bucket mounting base is provided with a guide portion fitted inside the rolling bearing. The rolling bearing is coaxially arranged with the output shaft to bear the radial load of the working bucket mounting base.

[0015] Specifically, the rolling bearing includes a first rolling bearing and a second rolling bearing located at the upper and lower ends of the swing mechanism mounting base, respectively. The bearing mounting base is provided with a first bearing mounting base for mounting the first rolling bearing and a second bearing mounting base for mounting the second rolling bearing. The guide portion includes an upwardly protruding first boss and a downwardly protruding second boss. The first boss is fitted inside the first rolling bearing, and the second boss is fitted inside the second rolling bearing.

[0016] Preferably, in the assembled state, the lower end face of the first rolling bearing is in contact with the stepped surface of the first boss, and a runout gap is formed between the upper end face of the second rolling bearing and the stepped surface of the second boss.

[0017] As a specific structural form, the working bucket mounting base is pivotally connected to the weighing sensor via a pin, and the central axis of the pin is perpendicular to the central axis of the output shaft.

[0018] Typically, the load cell is a pressure load cell mounted on the upper end of the output shaft of the swing mechanism, and the working bucket mounting base is connected to the upper end face of the load cell; or the load cell is a tension load cell mounted on the lower end of the output shaft of the swing mechanism, and the working bucket mounting base is connected to the lower end face of the load cell.

[0019] Preferably, a buffer pad is provided between the weighing sensor and the upper or lower end of the output shaft of the swing mechanism.

[0020] Specifically, the weighing sensor and the buffer pad are connected together to the output shaft of the swing mechanism by bolts.

[0021] Corresponding to the aforementioned working bucket weighing device, the present invention provides a weighing method, comprising the following steps: real-time acquisition of the load value of the working bucket in the weighing direction, acquisition of the angle value between the weighing direction of the working bucket and the vertical line, and calculation of the actual load of the working bucket based on the load value and the angle value.

[0022] Specifically, the actual load G2 of the working bucket is calculated according to the following formula:

[0023]

[0024] Wherein, N is the load value. G1 is the angle value, and G1 is the load value of the working bucket when it is unloaded.

[0025] Preferably, after obtaining the actual load of the working bucket, the method further includes the following step: if the actual load exceeds the weight limit, an alarm signal is issued.

[0026] Furthermore, the present invention provides a working bucket weighing system, including a weighing device, an angle sensor, and a controller. The weighing device is the working bucket weighing device described in any of the above technical solutions. The angle sensor is disposed on the working bucket to detect the angle value between the working bucket and the vertical line in real time. The controller is electrically connected to the weighing sensor and the angle sensor, and the controller is capable of executing the working bucket weighing method according to any of the above technical solutions.

[0027] Preferably, the controller is equipped with a filter capable of filtering the output signals of the weighing sensor and the angle sensor.

[0028] Furthermore, the present invention provides an engineering machinery comprising the working bucket weighing system described in any one of the above technical solutions.

[0029] Typically, the construction machinery is an aerial work platform, including a chassis, a boom, the weighing device, and the work bucket.

[0030] Furthermore, the present invention also provides a readable storage medium storing executable instructions, which, when executed by a machine, implement the working bucket weighing method according to any one of the above technical solutions.

[0031] The beneficial effects of the present invention through the above solution are as follows:

[0032] The present invention relates to a working bucket weighing device that directly connects the working bucket mounting base, which is used to connect the working bucket, to the output shaft of the swing mechanism via a weighing sensor. The weighing sensor can directly detect the load on the working bucket, and the working bucket mounting base is rotatably connected to the weighing sensor. The axis of rotation between the two is perpendicular to the central axis of the output shaft, giving the working bucket mounting base the freedom to rotate up and down. Under the action of bending moment, the working bucket mounting base can rotate freely up and down, ensuring that the bending moment borne by the working bucket mounting base does not affect the weighing sensor. The swing mechanism mounting base is provided with a radial bearing structure for bearing the radial load of the working bucket mounting base, which can constrain the rotational freedom of the working bucket mounting base. The radial reaction force of the radial bearing structure on the working bucket mounting base can offset the influence of the bending moment on the weighing sensor. At the same time, the radial bearing structure only bears radial force and not axial force, so that all the axial force of the working bucket mounting base is transferred to the weighing sensor. The force of the working bucket mounting base on the weighing sensor coincides with the force axis of the weighing sensor, ensuring the accuracy of the weighing result.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a structural schematic diagram of a specific embodiment of the engineering machinery of the present invention, which is an aerial work platform vehicle;

[0036] Figure 2 This is a schematic diagram of a specific embodiment of the working bucket weighing device of the present invention;

[0037] Figure 3 This is an exploded structural diagram of a specific embodiment of the working bucket weighing device of the present invention;

[0038] Figure 4 This is a schematic diagram of the bearing positioning boss of the working bucket weighing device of the present invention;

[0039] Figure 5 This is a schematic diagram of the rolling bearing assembly relationship of the working bucket weighing device of the present invention;

[0040] Figure 6 This is a force analysis diagram of the working bucket weighing device of the present invention in a vertical state;

[0041] Figure 7 This is a force analysis diagram of the working bucket weighing device of the present invention in an inclined state;

[0042] Figure 8 This is a schematic diagram of the control logic of the working bucket weighing system of the present invention.

[0043] Explanation of reference numerals in the attached figures

[0044] Detailed Implementation

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention, and the scope of protection of the present invention is not limited to the specific embodiments described below.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "forming," "having," "setting," and "connecting," etc., should be interpreted broadly. For example, a connection can be a direct connection or an indirect connection through an intermediate medium; it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate connector; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In this invention, unless otherwise specified, the directional terms "up," "down," "left," "right," "counterclockwise," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The directional terms of this invention should be understood in conjunction with the actual installation state.

[0048] It should be noted that, unless otherwise specified, “radial” refers to the radial direction of the output shaft 321 of the swing mechanism 32, and “axial” refers to the axial direction of the output shaft 321 of the swing mechanism 32.

[0049] See Figure 2 and Figure 3As a specific embodiment of the working bucket weighing device of the present invention, it includes a swing mechanism mounting base 31, a swing mechanism 32, a weighing sensor 33, and a working bucket mounting base 36 for connecting the working bucket 4. The swing mechanism mounting base 31 is connected to the swing mechanism 32. The swing mechanism 32 is preferably a swing cylinder, which can realize the rotation adjustment of the working bucket 4. The weighing sensor 33 is installed at one end of the output shaft 321 of the swing mechanism 32. The working bucket mounting base 36 is rotatably connected to the weighing sensor 33, and the rotation axis between the two is perpendicular to the central axis of the output shaft 321, so that the working bucket mounting base 36 has the freedom to rotate up and down along the central axis. Therefore, the working bucket mounting base can rotate freely under the action of bending moment, and the bending moment borne by the working bucket mounting base 36 will not act on the weighing sensor 33, thus avoiding affecting the measurement accuracy of the weighing sensor 33. Furthermore, the swing mechanism mounting base 31 is provided with a radial bearing structure for bearing the radial load of the working bucket mounting base 36. This structure can constrain the rotational freedom of the working bucket mounting base 36, and the radial reaction force of this radial bearing structure on the working bucket mounting base 36 can offset the influence of the bending moment on the weighing sensor 33. At the same time, this radial bearing structure does not bear axial force. Combined with the rotational connection between the working bucket mounting base 36 and the weighing sensor 33, the load of the working bucket mounting base 36 can be fully applied to the weighing sensor 33 along the axial direction of the output shaft 321. The force axis of the weighing sensor 33 is aligned with the central axis of the output shaft 321, thereby ensuring that the line of action of the loading force of the working bucket mounting base 36 on the weighing sensor 33 coincides with the force axis of the weighing sensor 33. This effectively eliminates the influence of the off-center loading of the working bucket 4 on the weighing result and ensures the accuracy of the weighing result.

[0050] As a specific embodiment of the working bucket weighing device of the present invention, see [link to relevant documentation]. Figure 2-5The radial bearing structure includes a rolling bearing 34 and a bearing mounting seat 35 for mounting the rolling bearing 34. The bearing mounting seat 35 is fixedly connected to the swing mechanism mounting seat 31 to position the rolling bearing. The working bucket mounting seat 36 is provided with a guide portion fitted inside the rolling bearing 34. The rolling bearing 34 is coaxially arranged with the output shaft 321, that is, the central axis of the rolling bearing 34 coincides with the central axis of the output shaft 321. When the output shaft 321 outputs torque, the guide portion can rotate synchronously with the output shaft 321 inside the rolling bearing 34, which facilitates the transmission of torque by the output shaft 321 through the working bucket mounting seat 36 to drive the working bucket 4 to rotate. At the same time, the rolling bearing 34 only bears radial force and is used to bear the radial load of the working bucket mounting seat 36. The radial reaction force of the rolling bearing 34 on the working bucket mounting seat 36 can completely offset the off-center load effect of the working bucket 4. It should be noted that the connection between the bearing mounting base 35 and the swing mechanism mounting base 31 can be varied. For example, it can be detachably connected to the swing mechanism mounting base 31 by bolts, which is convenient for manufacturing and subsequent maintenance. Alternatively, it can be integrally connected to the swing mechanism mounting base 31, such as welding the bearing mounting base 35 to the swing mechanism mounting base 31, or the two can be manufactured as a single piece.

[0051] Considering structural stability, as a preferred embodiment, see [reference needed]. Figure 2-5 The rolling bearing 34 includes a first rolling bearing 341 and a second rolling bearing 342 located at the upper and lower ends of the swing mechanism mounting base 31, respectively. Correspondingly, the bearing mounting base 35 is provided with a first bearing mounting base 351 for mounting the first rolling bearing 341 and a second bearing mounting base 352 for mounting the second rolling bearing 342. The guide portion includes an upwardly protruding first boss 361 and a downwardly protruding second boss 362. The first boss 361 is fitted inside the first rolling bearing 341, and the second boss 362 is fitted inside the second rolling bearing 342. The first rolling bearing 341 and the second rolling bearing 342 at the upper and lower ends jointly restrict the rotational freedom between the working bucket mounting base 36 and the weighing sensor 33, and counteract the influence of the off-center load on the weighing sensor 33.

[0052] Specifically, a stepped surface is formed on the first boss 361 to prevent the first rolling bearing 341 from axially disengaging, and a stepped surface is formed on the second boss 362 to prevent the second rolling bearing 342 from axially disengaging. In actual use, due to gravity, the working bucket 4 will cause the working bucket mounting base 36 to undergo downward deformation. To avoid this deformation causing the working bucket mounting base 36 to exert axial pressure on the second rolling bearing 342 and affecting the actual measurement results of the weighing sensor 33, preferably, see [reference needed]. Figure 4-5In the assembled state, the lower end face of the first rolling bearing 341 is in contact with the stepped surface of the first boss 361, meaning that the working bucket mounting seat 36 can only jump downward in the axial direction, but cannot jump upward in the axial direction. A jump gap T is formed between the upper end face of the second rolling bearing 342 and the stepped surface of the second boss 362, allowing the second rolling bearing 342 to jump upward relative to the working bucket mounting seat 36. However, the jump gap T is large enough to ensure that the stepped surface of the second boss 362 will not apply axial pressure to the second rolling bearing 342 when the working bucket 4 is in a fully loaded state. Therefore, when the working bucket 4 is under load, the working bucket mounting base 36 will move downward and deform. The first boss 361 at the upper end can move freely downward along the axial direction. The second boss 362 at the lower end will not squeeze the upper end face of the second rolling bearing 342 even under full load. This means that under any condition, the rolling bearing 34 does not bear any axial force, but only bears radial force under the action of off-center load in the working bucket mounting base 36. All the axial force is transmitted to the weighing sensor 33.

[0053] Furthermore, since the central axes of the first rolling bearing 341, the second rolling bearing 342, the first boss 361, the second boss 362, and the swing mechanism 32 are all on the same straight line, the working bucket mounting base 36, the swing mechanism 32, and the weighing sensor 33 can be integrated into the same vertical plane, which can greatly reduce the space occupied by the working bucket weighing device of the present invention and reduce the overall weight of the device. The structure is reasonable, convenient for subsequent maintenance and assembly, and improves the working efficiency of the aerial work platform.

[0054] As a specific embodiment of the rotating connection structure between the working bucket mounting base 36 and the weighing sensor 33 of the working bucket weighing device of the present invention, see [link to specific embodiment]. Figure 2 and Figure 3 The working bucket mounting base 36 is pivotally connected to the load cell 33 via a pin 37. The central axis of the pin 37 is perpendicular to the central axis of the output shaft 321, giving the working bucket mounting base 36 the freedom to rotate up and down. This ensures that the off-center load will not affect the load cell 33. With the radial constraint of the rolling bearing 34, the axial force of the working bucket mounting base 36 can be transmitted to the load cell 33 through the pin 37. Furthermore, the structure of the connection via the pin 37 avoids large-plane contact between the force-applying component and the load cell 33, completely eliminating the influence of bending moment on the load cell measurement results.

[0055] See Figure 2 and Figure 3 The upper and lower ends of the working bucket mounting base 36 are respectively formed with flanges for connecting the working bucket 4, and the load cell 33 is rotatably connected to the flanges. Specifically, the load cell 33 is divided into pressure type and tension type according to the weighing principle. When the load cell 33 is a pressure type load cell, see [link to relevant documentation]. Figure 2 and Figure 3 The load cell 33 is mounted on the upper end face of the output shaft 321 of the swing mechanism 32. The lower end face of the flange located at the upper end of the working bucket mounting base 36 is rotatably connected to the upper end face of the load cell 33 via a pin 37, so that the working bucket mounting base 36 generates axial pressure on the load cell 33. In addition, there is a gap between the flange located at the lower end of the working bucket mounting base 36 and the lower end face of the swing mechanism 32, and there is no connection between the two, so as to prevent the load of the working bucket 4 from being transmitted to the swing mechanism 32 through the lower part of the working bucket mounting base 36; when the load cell 33 is... In the case of a tension-type load cell, the load cell 33 is mounted on the lower end face of the output shaft 321 of the swing mechanism 32. The upper end face of the flange located at the lower end of the working bucket mounting base 36 is rotatably connected to the lower end face of the load cell 33 via a pin 37, so that the working bucket mounting base 36 generates a tension force along the axis on the load cell 33. In addition, there is a gap between the flange located at the upper end of the working bucket mounting base 36 and the upper end face of the swing mechanism 32, and the two are not connected, so as to prevent the load of the working bucket 4 from being transmitted to the swing mechanism 32 through the upper part of the working bucket mounting base 36. It should be noted that the load cell 33 is preferably a disc-type load cell, which can be better mounted on the output shaft 321. By setting the disc-type load cell and the output shaft 321 coaxially, the load of the working bucket 4 is transmitted to the disc-type load cell through the pin along its central axis, resulting in uniform force distribution and ensuring the accuracy of the measurement results of the load cell 33.

[0056] It should be noted that the working bucket weighing device of the present invention transmits the load of the working bucket 4 to the weighing sensor 33 through the pin 37. The working bucket mounting base 36 and the weighing sensor 33 are rigidly connected. External impact will not cause the pressure-applying component (working bucket mounting base 36) and the weighing sensor 33 to separate and then make contact again. Instead, they float together along the axial direction, thereby effectively protecting the weighing sensor 33.

[0057] However, during the weighing process, ground ripples and crevices can cause vibrations and impacts inside the weighing device of this invention. To further protect the weighing sensor 33 and reduce fluctuations in the measurement results, preferably, a buffer pad 38 is provided between the weighing sensor 33 and the output shaft 321 of the swing mechanism 32. When the weighing sensor 33 is a pressure type weighing sensor, the buffer pad 38 is located between the weighing sensor 33 and the upper end of the output shaft 321; when the weighing sensor 33 is a tension type weighing sensor, the buffer pad 38 is located between the weighing sensor 33 and the lower end of the output shaft 321. Further, see... Figure 2 The load cell 33 and the buffer pad 38 are connected together to the output shaft 321 of the swing mechanism 32 by bolts 39.

[0058] The specific and preferred embodiments of the working bucket weighing device of the present invention have been described above. In order to better understand the technical solution of the working bucket weighing device of the present invention, the following will be carried out according to... Figure 2-3 The specific embodiments shown illustrate the working principle of the working bucket weighing device of the present invention:

[0059] The force conditions of the working bucket weighing device of the present invention are as follows: Figure 6 As shown, the pin 37, the working bucket mounting base 36, the working bucket 4, and the load inside the working bucket 4 can be considered as a whole as an external load G, which can be equivalent to a force F along the axial direction of the output shaft 321 of the swing mechanism 32 and a bending moment M with the pin 7 axis as the point of application. Let the sum of the weights of the pin 37, the working bucket mounting base 36, and the working bucket 4 be G1, and the actual load of the working bucket 4 be G2, then... .

[0060] Taking the working bucket mounting base 36 as the analysis object, it bears a total of four loads: external load G (equivalent to axial force F and bending moment M), radial tensile force F1 of the first rolling bearing 341, radial thrust F2 of the second rolling bearing 342, and reaction force N of the pin 37. Figure 6 As shown, a pivot pin 37 is used to connect the work bucket mounting base 36 and the weighing sensor 33, thus preventing the work bucket mounting base 36 from rotating clockwise. Figure 6 The degrees of freedom (as shown in the orientation) are such that when the working bucket mounting base 36 is subjected to an external load G, the working bucket mounting base 36 can rotate freely around the axis O of the pin shaft 37 under the action of bending moment M. Under the action of bending moment M, the first rolling bearing 341 generates a tensile force F1 on the first boss 361 of the working bucket mounting base 36 radially, with a lever arm of d1. The second rolling bearing 342 generates a thrust force F2 on the second boss 362 of the working bucket mounting base 36 radially, with a lever arm of d2. The moments of the tensile force F1 and the thrust force F2 can balance the bending moment M, satisfying: This allows the bending moment M to counteract the influence of the weighing sensor 33. The external load G can be applied axially to the weighing sensor 33 via the pin 37, along with the equivalent force F borne by the working bucket mounting base 36 and the reaction force N of the pin 37. The two forces satisfy: F = N. The reaction force of the pin 37 is also the load detected by the weighing sensor 33. Subtracting irrelevant mass, the actual load G2 of the working bucket 4 can be accurately obtained. .

[0061] The above force analysis is based on the force analysis of the working bucket weighing device of the present invention in a vertical state, that is, the direction of the central axis of the output shaft 321 is the vertical direction. Under special circumstances, due to factors such as uneven ground, device shaking, and elastic deformation of the overall structure, the central axis of the output shaft 321 of the swing mechanism 32 of the working bucket weighing device of the present invention may not be in the vertical direction, but rather at a certain angle to the vertical. That is, there exists an angle between the equivalent force F and the external load G. ,satisfy: See Figure 7 At this point, the load measured by the load cell 33 is still N, so the actual load of the working bucket 4 is: .

[0062] The present invention also provides a method for weighing a working bucket, which is based on the working bucket weighing device or other equipment provided by the present invention. The weighing method includes the following steps: real-time acquisition of the load value of the working bucket 4 in the weighing direction, and calculation of the actual load of the working bucket 4 based on the load value and the angle value.

[0063] Specifically, based on the above force analysis, the actual load G2 of the working bucket 4 can be calculated using the following formula:

[0064]

[0065] Wherein, N is the load value. G1 is the angle value, and G1 is the load value of the working bucket 4 when it is unloaded. G1 can be obtained by placing the working bucket weighing device of the present invention in a vertical state, with the working bucket 4 unloaded, and reading the measured value of the weighing sensor 33. This measured value is G1.

[0066] Furthermore, in order to promptly alert workers in the event of overloading of the working bucket 4, the working bucket weighing method of the present invention, after obtaining the actual load of the working bucket 4, also includes the following steps: if the actual load is greater than the limit value, an alarm signal is issued; if the actual load is not greater than the limit value, monitoring continues.

[0067] Based on the specific embodiments of the above-described working bucket weighing device and method, the present invention provides a working bucket weighing system, see [link to relevant documentation]. Figure 1The system includes a weighing device 3, an angle sensor 41, and a controller 11. The weighing device 3 is the working bucket weighing device provided by this invention. The angle sensor 41 is installed on the working bucket 4 to detect the angle between the working bucket 4 and the plumb line. The controller 11 is electrically connected to the weighing sensor 33 and the angle sensor 41, and the controller 11 can execute the working bucket weighing method provided by this invention. In order to promptly issue an alarm to remind workers when the working bucket 4 is overloaded, the working bucket weighing system of this invention is also equipped with an alarm 42. After obtaining the actual load of the working bucket 4, the controller 11 judges the actual load. If the actual load is less than the limit value, it continues to monitor; if the actual load is greater than or equal to the limit value, the controller 11 controls the alarm 42 to issue an alarm signal until the load of the working bucket 4 is reduced to less than the limit value.

[0068] Preferably, the controller 11 is provided with a filter 12 that can filter the output signals of the weighing sensor 33 and the angle sensor 41, so as to avoid the reduction of the fluctuation coefficient of the output signals of the weighing sensor 33 and the angle sensor 41, and to avoid the fluctuation affecting the weighing result and the controller 11 malfunctioning.

[0069] Specifically, the principle of the control logic of the working bucket weighing system of the present invention is as follows: Figure 8 As shown, when the working bucket is loaded, the load sensor 33 detects the load value N in real time, and the angle sensor 41 detects the angle value in real time. Filter 12 receives the load value N and the angle value. The system performs filtering. Controller 11 receives the filtered value and calculates whether the calculated value (actual load of the working bucket 4) exceeds the weight limit. If it does, controller 11 activates alarm 42. If it does not exceed the weight limit, it continues to monitor the load value N of weighing sensor 33 and the angle value of angle sensor 41. To ensure the safe operation of workbench 4.

[0070] The present invention also provides an engineering machinery, which includes the working bucket weighing system provided by the present invention, through which the load of the working bucket can be accurately measured.

[0071] Typically, see Figure 1This construction machinery is an aerial work platform, comprising a chassis 1, an actuator 2, a weighing device 3, and a work bucket 4. The chassis 1 is the foundation of the aerial work platform, enabling it to move and change positions. The controller 1 and filter 12 are both mounted on the chassis 1. The actuator 2 is driven by a hydraulic rod and can extend to a specific spatial position, allowing the work bucket 4 to complete the predetermined aerial work. The weighing device 3 can detect the load in the work bucket 4 in real time, helping to determine whether the actual load exceeds the limit, thereby constraining the maximum extension distance of the actuator 2 and preventing the vehicle from overturning due to overextension of the actuator 2. The work bucket 4 is the operator's work platform and can also hold necessary tools. An angle sensor 41 is mounted on the work bucket 4 to detect the angle between the work bucket 4 and the horizontal plane in real time, facilitating load correction by the controller. An alarm 42 is also mounted on the work bucket 4, which can remind the operator on the work bucket 4 to make timely adjustments when the work bucket 4 is overloaded, thus preventing safety accidents. The swing mechanism mounting base 31 is installed at the end of the actuator arm 2 (near the end of the work bucket 4), and the work bucket mounting base 36 is used to install the work bucket 4. It should be noted that the work bucket weighing system of the present invention is not limited to use on aerial work platforms, but can also be used on engineering machinery equipment that requires load measurement, such as emergency vehicles and fire rescue vehicles.

[0072] In addition, the present invention provides a readable storage medium storing executable instructions, which, when executed by a machine, implement the working bucket weighing method described in any of the above technical solutions.

[0073] As can be seen from the above description of the various technical solutions of the present invention, the present invention mainly connects the working bucket mounting base 36 to the weighing sensor 33 through the pin 37, so that the working bucket mounting base 36 has the freedom to rotate up and down. The bending moment borne by the working bucket mounting base 36 will not act on the weighing sensor 33. At the same time, by setting the first rolling bearing 341 and the second rolling bearing 342 at the upper and lower ends of the swing mechanism mounting base 31 respectively, the first boss 361 and the second boss 362 at the upper and lower ends of the working bucket mounting base 36 are respectively fitted onto the first rolling bearing 341 and the second rolling bearing 342. Taking advantage of the characteristic that the rolling bearing only bears radial force and not axial force, the torque of the first rolling bearing 341 on the first boss 361 and the torque of the second rolling bearing 342 on the second boss 362 cancel out the bending moment borne by the working bucket mounting base 36, ensuring that the load of the working bucket 4 can be fully applied to the weighing sensor 33 axially through the pin 37, eliminating the influence of off-center load on the weighing result and ensuring the accuracy of the measurement result of the weighing sensor 33.

[0074] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0075] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0076] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A weighing device for a working bucket, characterized in that, The device includes a swing mechanism mounting base (31), a swing mechanism (32), a weighing sensor (33), and a working bucket mounting base (36) for connecting the working bucket (4). The swing mechanism mounting base (31) is connected to the swing mechanism (32). The weighing sensor (33) is mounted on one end of the output shaft (321) of the swing mechanism (32). The working bucket mounting base (36) is rotatably connected to the weighing sensor (33), and the axis of rotation between the two is perpendicular to the central axis of the output shaft (321), so that the working bucket mounting base (36) has the freedom to rotate up and down along the central axis. The swing mechanism mounting base (31) is provided with a radial bearing structure for bearing the radial load of the working bucket mounting base (36) so as to constrain the rotational freedom of the working bucket mounting base (36).

2. The working bucket weighing device according to claim 1, characterized in that, The radial bearing structure includes a rolling bearing (34) and a bearing mounting seat (35) for mounting the rolling bearing (34). The bearing mounting seat (35) is connected to the swing mechanism mounting seat (31). The working bucket mounting seat (36) is provided with a guide portion fitted inside the rolling bearing (34). The rolling bearing (34) is coaxially arranged with the output shaft (321) to bear the radial load of the working bucket mounting seat (36).

3. The working bucket weighing device according to claim 2, characterized in that, The rolling bearing (34) includes a first rolling bearing (341) and a second rolling bearing (342) located at the upper and lower ends of the swing mechanism mounting base (31), respectively. The bearing mounting base (35) is provided with a first bearing mounting base (351) for mounting the first rolling bearing (341) and a second bearing mounting base (352) for mounting the second rolling bearing (342). The guide portion includes an upwardly protruding first boss (361) and a downwardly protruding second boss (362). The first boss (361) is fitted inside the first rolling bearing (341), and the second boss (362) is fitted inside the second rolling bearing (342).

4. The working bucket weighing device according to claim 3, characterized in that, When assembled, the lower end face of the first rolling bearing (341) is in contact with the stepped surface of the first boss (361), and a runout gap (T) is formed between the upper end face of the second rolling bearing (342) and the stepped surface of the second boss (362).

5. The working bucket weighing device according to any one of claims 1-4, characterized in that, The working bucket mounting base (36) is pivotally connected to the weighing sensor (33) via a pin (37), the central axis of which is perpendicular to the central axis of the output shaft (321).

6. The working bucket weighing device according to any one of claims 1-4, characterized in that, The weighing sensor (33) is a pressure-type weighing sensor installed on the upper end of the output shaft (321) of the swing mechanism (32), and the working bucket mounting base (36) is connected to the upper end face of the weighing sensor (33); or The weighing sensor (33) is a tension-type weighing sensor installed at the lower end of the output shaft (321) of the swing mechanism (32), and the working bucket mounting base (36) is connected to the lower end face of the weighing sensor (33).

7. The working bucket weighing device according to any one of claims 1-4, characterized in that, A buffer pad (38) is provided between the upper or lower end of the output shaft (321) of the weighing sensor (33) and the swing mechanism (32).

8. The working bucket weighing device according to any one of claims 7, characterized in that, The weighing sensor (33) and the buffer pad (38) are connected together to the output shaft (321) of the swing mechanism (32) by bolts (39).

9. A method for weighing a working bucket, characterized in that, The weighing method using the working bucket weighing device according to any one of claims 1-8 includes the following steps: The load value of the working bucket (4) in the weighing direction is collected in real time, and the angle value between the weighing direction of the working bucket (4) and the vertical line is collected. Based on the load value and the angle value, the actual load of the working bucket (4) is calculated.

10. The weighing method for the working bucket according to claim 9, characterized in that, The actual load G2 of the working bucket (4) is calculated according to the following formula: Wherein, N is the load value. G1 is the angle value, and G1 is the load value of the working bucket (4) when it is unloaded.

11. The weighing method for the working bucket according to claim 9, characterized in that, After obtaining the actual load of the working bucket (4), the following steps are also included: if the actual load is greater than the limit value, an alarm signal is issued.

12. A working bucket weighing system, characterized in that, The device includes a weighing device (3), an angle sensor (41), and a controller (11). The weighing device (3) is the working bucket weighing device according to any one of claims 1-8. The angle sensor (41) is disposed on the working bucket (4) for real-time detection of the angle between the working bucket (4) and the vertical line. The controller (11) is electrically connected to the weighing sensor (33) and the angle sensor (41). The controller (11) is capable of performing the working bucket weighing method according to any one of claims 9-11.

13. The working bucket weighing system according to claim 12, characterized in that, The controller (11) is equipped with a filter (12) that can filter the output signals of the weighing sensor (33) and the angle sensor (41).

14. An engineering machinery, characterized in that, The working bucket weighing system included in any one of claims 12-13.

15. The engineering machinery according to claim 14, characterized in that, The engineering machinery is an aerial work platform vehicle, including a chassis (1), an actuator (2), the weighing device (3), and the work bucket (4).

16. A readable storage medium having executable instructions stored thereon, characterized in that, The executable instructions are used, when executed by a machine, to implement the working bucket weighing method according to any one of claims 9-11.

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