Method and device for preventing overloading of a work platform of a bridge inspection vehicle

Abstract

Control procedures for preventing overloading of a work platform of a bridge inspection vehicle are available, comprising the following steps: Determining (610) a force F a at a first detection point a in an axial direction of an expansion and contraction cylinder, wherein the first detection point a is a joint between the expansion and contraction cylinder and a lifting tower; Determining (620) a force F b at a second investigation point b in a vertical direction, wherein the second investigation point b is a joint between the work platform and the lifting tower; Determining the degree of inclination of the lifting tower; Determine (630) the current load on the work platform according to - Inclination degree of the lifting tower, - Fa and - Fb; (640) compare the current load on the work platform with a permissible load on the work platform; Sending (650) an alarm according to the result of the comparison.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of the safety of a technical-mechanical work process at a great height, in particular to a control method for avoiding overloading of a working platform of a bridge inspection vehicle and a device therefor. TECHNOLOGICAL BACKGROUND

[0002] With the development of transportation technology, an increasing number of bridges are being built. Regular bridge inspections are necessary, which represents a significant workload. A bridge inspection vehicle is a valuable tool during these inspections, providing a flexible, mobile crew platform and allowing workers to easily carry out inspections and repairs in all directions. However, in practice, bridge inspection vehicles are commonly overloaded, leading to serious accidents such as rollovers and workers falling from the platform. There is an urgent need for a robust device or measure to prevent bridge inspection vehicles from being overloaded, thus protecting both personnel and equipment.

[0003] CN 1 01 624 810 A describes a bridge inspection vehicle with one or more cameras that are used to record the condition of a bridge.

[0004] DE 197 17 541 A1 describes a device for measuring the load on access machines, in particular on aerial work platforms with two masts arranged parallel to each other and a working platform extending between them.

[0005] The principle of a working platform of a bridge inspection vehicle is in Fig. Figure 1 shows a work platform and a lifting tower connected to each other by a hinge at point b. An expansion and contraction cylinder is connected to the lifting tower and the work platform by hinges at points a and c, respectively. The work platform can perform the following movements: folding out / folding in relative to the lifting tower about point b, rotating relative to the lifting tower about an axis d, and extending or contracting in a horizontal direction.

[0006] In the prior art, weighing sensors are typically mounted on two parallel stiffening elements of a work platform. The weighing sensors transmit a collective signal to a central processing unit, which performs data processing to derive the load on the platform. This load is then compared with preset full load and overload values ​​to trigger an alarm or to switch off the power supply to the work platform via a relay.

[0007] However, the state of the art has the following disadvantages: The positions of the sensor determination are defined in an unsuitable way; and according to the load-bearing properties of the force measuring points, the determined signal cannot accurately reflect the load on the platform. SUMMARY OF THE INVENTION

[0008] With regard to the aforementioned technical problems, one objective of the present application is to provide a control method and a control device for preventing overloading of a work platform of a bridge inspection vehicle, which can accurately monitor the load on the work platform and strictly prevent it from being overloaded.

[0009] The problem is solved by a control method according to claim 1 and a control device according to claim 6. Further developments of the invention are specified in the dependent claims.

[0010] According to one aspect of this disclosure, the present application provides a control method for preventing overloading of a work platform of a bridge inspection vehicle, which comprises the following steps: Determining a force F aat a first measurement point a in an axial direction of an expansion and contraction cylinder, wherein the first measurement point a is a joint between the expansion and contraction cylinder and a lifting tower; determining a force F b at a second investigation point b in a vertical direction, wherein the second investigation point b is a joint between the work platform and the lifting tower; determining a current load on the work platform according to F a and F b ; Comparing the current load on the work platform with a permissible load on the work platform; sending an alarm according to the result of the comparison.

[0011] In one embodiment of the present application, determining the degree of inclination of the lifting tower before determining the current load on the work platform according to F is also possible. a and F bincludes; whereby determining the current load on the work platform according to F a and F b Determining the current load on the work platform according to the degree of inclination of the lifting tower as well as F a and F b includes.

[0012] In one embodiment of the present application, the following steps are further included before sending an alarm according to the result of the comparison: Determining a current torque of the work platform according to F a ; Comparing the current torque of the work platform with a permissible torque of the work platform; wherein the result of the comparison includes the result of comparing the current load of the work platform with the permissible load of the work platform and the result of comparing the current torque of the work platform with the permissible torque of the work platform.

[0013] In one embodiment of the present application, the following is further included: displaying the current load on the work platform and the current torque of the work platform in real time.

[0014] In one embodiment of the present application, sending an alarm according to the result of the comparison comprises sending an alarm according to the result of the comparison and restricting the movements of the work platform.

[0015] In one embodiment of the present application, a first alarm signal is sent when the current load on the work platform exceeds 90% of the permissible load on the work platform, and a second alarm signal is sent and movement of the work platform in the form of rotation towards the outside of the bridge plate is restricted when the current load on the work platform reaches the permissible load on the work platform, until the current load on the work platform is less than 90% of the permissible load on the work platform;A first alarm signal is sent when the current torque of the work platform exceeds 90% of the permissible torque of the work platform, and a second alarm signal is sent and movement of the work platform in the form of rotation towards the outside of the bridge plate is restricted when the current torque of the work platform reaches the permissible torque of the work platform, until the current torque of the work platform is less than 90% of the permissible torque of the work platform.

[0016] According to another aspect of this disclosure, the present application provides a control device for preventing overloading of a working platform of a bridge inspection vehicle, comprising: a first bolt axis sensor for determining a force F aat a first detection point a in an axial direction of an expansion-contraction cylinder, wherein the first detection point a is a joint between the expansion-contraction cylinder and a lifting tower; a second bolt axis sensor for determining a force F b at a second detection point b in a vertical direction, wherein the second detection point b is a joint between the work platform and the lifting tower; an overload prevention control unit for determining a current load on the work platform according to F a and F b as well as for comparing the current load on the work platform with a permissible load on the work platform; and an alarm device for sending an alarm according to the result of a comparison by the overload prevention control unit.

[0017] In one embodiment of the present application, a two-axis tilt sensor for determining the degree of inclination of the lifting tower is further included, wherein the overload prevention control unit determines the current load on the work platform according to the degree of inclination of the lifting tower, F a and F b determined.

[0018] In one embodiment of the present application, the overload prevention control unit also determines a current torque of the work platform according to F. a and compares the current torque of the work platform with a permissible torque of the work platform; wherein the result of the comparison includes the result of comparing the current load of the work platform with the permissible load of the work platform and the result of comparing the current torque of the work platform with the permissible torque of the work platform.

[0019] In one embodiment of the present application, a display for showing the current load on the work platform and the current torque of the work platform in real time is also included.

[0020] In one embodiment of the present application, an actuating element for limiting movements of the work platform according to the result of the comparison of the overload prevention control unit is further included.

[0021] In one embodiment of the present application, the alarm device sends a first alarm signal when the current load on the work platform exceeds 90% of the permissible load on the work platform or the current torque on the work platform exceeds 90% of the permissible torque on the work platform, and a second alarm signal when the current load on the work platform reaches the permissible load on the work platform or the current torque on the work platform reaches the permissible torque on the work platform; the actuating element restricts rotational movement of the work platform towards the outside of the bridge plate when the current load on the work platform reaches the permissible load on the work platform, until the current load on the work platform is less than 90% of the permissible load on the work platform;and it restricts rotational movement of the work platform towards the outside of the bridge plate when the current torque of the work platform reaches the permissible torque of the work platform, until the current torque of the work platform is less than 90% of the permissible torque of the work platform.

[0022] The present application enables precise monitoring of the load on the work platform, so that overloading of the work platform can be strictly avoided and the occurrence of phenomena such as vehicle rollover and platform breakage, etc., can be prevented in order to guarantee the safety of persons and the safety of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To describe the technical solutions in the embodiments of the present application or in the prior art more clearly, the following section will provide a brief introduction to the figures used to describe the embodiments or the prior art. It is understood that the figures to be described in the following section merely illustrate some embodiments of the present application and that a person skilled in the art can derive other figures from these figures without incurring any creative effort. Fig. Figure 1 is a schematic representation of the principle of the mechanism of an embodiment of a working platform of the bridge inspection vehicle. Fig. Figure 2 is a schematic representation of a first embodiment of a control device for preventing overloading of a working platform of a bridge inspection vehicle. Fig. Figure 3 is a schematic representation of determining the weight and torque of a work platform in an embodiment according to the present application. Fig. Figure 4 is a schematic representation of a second embodiment of a control device for preventing overloading of a working platform of a bridge inspection vehicle according to the present application. Fig. Figure 5 is a schematic representation of a third embodiment of a control device for preventing overloading of a working platform of a bridge inspection vehicle according to the present application. Fig. Figure 6 is a schematic representation of a first embodiment of a control method for avoiding overloading of a working platform of a bridge inspection vehicle according to the present application. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0024] The following section, with reference to the figures illustrating the embodiments of the present application, will provide a clear and comprehensive description of the technical solution in the embodiments of the present application. It is understood that what is described corresponds only to some, and not all, embodiments of the present application. The following description of at least one exemplary embodiment is for illustrative purposes only and does not constitute a limitation of the present application, its application, or its use. Based on the embodiments of the present application, all other embodiments that could be obtained by a person skilled in the art without any creative effort are within the scope of protection of the present application.

[0025] Unless specifically stated otherwise, relative arrangements, numerical expressions and values ​​in the elements and steps described in these embodiments are not limited to the scope of the present application.

[0026] However, it should be understood that, for the sake of simplicity of description, the size of each element shown in the figures is not drawn according to an actual scale relationship.

[0027] Techniques, methods and devices known to a person skilled in the art need not be discussed in detail, but should, where appropriate, be considered as part of the description for which a patent right is to be granted.

[0028] In all the examples shown and discussed here, each specific value should be understood merely as an example, rather than a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0029] It should be noted that similar reference symbols and letters in the following figures denote similar elements. Therefore, once a particular element has been defined in one figure, it will not be discussed in subsequent figures.

[0030] Fig. Figure 2 is a schematic representation of a first embodiment of a control device for preventing overloading of a work platform of a bridge inspection vehicle. As shown by Fig. As shown in Figure 2, the device includes a first bolt axis sensor 1, a second bolt axis sensor 2, an overload prevention control unit 3 and an alarm device 4.

[0031] The first bolt axis sensor 1 is arranged at a first detection point a, which is a joint between an expansion and contraction cylinder and a lifting tower; the second bolt axis sensor 2 is arranged at a second detection point b, which is a joint between the work platform and the lifting tower; the overload prevention control unit 3 is connected to the first bolt axis sensor 1 and the second bolt axis sensor 2, respectively, and the alarm device 4 is connected to the overload prevention control unit 3.

[0032] In one embodiment of the present application, the device can include two symmetrically distributed first bolt axis sensors 1 and two symmetrically distributed second bolt axis sensors 2.

[0033] The first bolt axis sensor 1 is used to determine a force F aused at the investigation point a in an axial direction of an expansion and contraction cylinder.

[0034] The second bolt axis sensor 2 is used to determine a force F b used at the second investigation point b in a vertical direction.

[0035] The overload prevention control unit 3 is used to determine a current load M on the work platform according to F. a and F b and to compare the current load M of the work platform with a permissible load M e used on the work platform.

[0036] In one embodiment of the present application, the overload prevention control unit 3 is specifically used to obtain the current load M of the work platform according to equation (1): M=Fb−Fa sin θabg−Mk

[0037] This is how it is, as in Fig. 3 shown, θ aban angle between F ab and in one direction, M k a sum of the empty weight of the platform and the weight of the expansion and contraction cylinder, and g the gravitational acceleration.

[0038] The alarm device 4 is used to send an alarm according to the result of the comparison of the overload prevention control unit 3.

[0039] In one embodiment of the present application, the alarm device 4 includes at least one of such alarm devices as a buzzer, an alarm lamp, etc.

[0040] In this embodiment of the present application, the bolt axis sensor in the control device for preventing overloading of a work platform of a bridge inspection vehicle is strategically positioned according to the load-bearing properties of the force measuring points, which enables accurate monitoring of the load on the work platform, so that overloading of the work platform can be strictly avoided and the occurrence of phenomena such as vehicle rollover and platform breakage, etc., can be prevented in order to ensure the safety of persons and the safety of the equipment.

[0041] The applicant has discovered that the prior art suffers from the following technical problem: The influence of the lifting tower's inclination on the force measurement is not taken into account, and the measured weight will therefore exhibit a measurement deviation, which can cause the vehicle to roll over. Therefore, in the embodiment of the Fig. 2. A two-axis tilt sensor was added to this application to solve this technical problem.

[0042] Fig. Figure 4 is a schematic representation of a second embodiment of a control device for preventing overloading of a work platform of a bridge inspection vehicle of the present application. Compared with the embodiment of Fig. 2 contains the device in the embodiment of the Fig. 4. Furthermore, a two-axis tilt sensor. 5.

[0043] The two-axis tilt sensor 5 is used to determine the tilt angle of the lifting tower.

[0044] The overload prevention control unit 3 is used to determine the current load on the work platform according to the tilt angle of the lifting tower as well as F. a and F b used.

[0045] In one embodiment of the present application, the overload prevention control unit 3 is specifically used to determine the current load M of the work platform according to equation (2): M=Fb−Fa sin θabg cosθxcosθy−Mk

[0046] This includes, as in Fig. Figure 3 shows x, y and z coordinate axes, where z is a vertical direction; θ x and θ y Inclination angle of the lifting tower relative to the directions of the x-axis and y-axis; θ ab an angle between F a and in one direction, M k a sum of the empty weight of the platform and the weight of the expansion and contraction cylinder, and g the gravitational acceleration.

[0047] This embodiment of the present application fully takes into account the influence of the lifting tower's inclination, corrects the determined data, and thus further increases the accuracy of determining the work platform's load. Therefore, it is possible to avoid overloading the work platform even more rigorously and to additionally prevent phenomena such as vehicle rollovers and platform breakage, etc., thereby ensuring the safety of personnel and equipment.

[0048] The applicant also discovered that the prior art is afflicted with a further technical problem: only the weight of the work platform can be measured; the torque of the work platform remains unknown. Thus, even if the weight does not exceed a limit, the torque may already have exceeded a limit, potentially causing the work platform to break. Therefore, the embodiment of Fig. 2 or the Fig. 4 of the present application, a torque determination function has been added to solve this technical problem.

[0049] In the embodiment of the Fig. 2 or the Fig. 4. The overload prevention control unit 3 is also used to measure the current torque of the work platform according to F. a to determine and compare the current torque of the work platform with a permissible torque of the work platform. Thus, the result of the comparison of the overload prevention control unit 3 in the Fig. 2 or in the Fig. 4 in the illustrated embodiment, the result of comparing the current load of the work platform with the permissible load of the work platform and the result of comparing the current torque of the work platform with the permissible torque of the work platform.

[0050] In one embodiment of the present application, the overload prevention control unit 3 is specifically used to control the current torque T. b to determine the working platform according to equation (3): Tb=FaLab

[0051] This is how it is, as in Fig. 3 shown, L ab a force arm of force F a to the second investigation office b.

[0052] In one embodiment of the present application, the alarm device 4 is used to emit a first alarm signal when the current load on the work platform exceeds 90% of the permissible load on the work platform or the current torque on the work platform exceeds 90% of the permissible torque on the work platform, and to emit a second alarm signal when the current load on the work platform reaches the permissible load on the work platform or the current torque on the work platform reaches the permissible torque on the work platform; the second alarm signal has a higher alarm level than the first alarm signal. For example, the second alarm signal can be distinguished from the first alarm signal by a light or a sound signal of a faster frequency.

[0053] The embodiment of the present application mentioned above can not only measure the weight of the work platform, but also determine the magnitude of its torque, thus ensuring that neither the weight nor the torque of the work platform exceeds a limit during the operation of the bridge inspection vehicle. This further prevents phenomena such as vehicle rollover and platform breakage, etc., and thus guarantees the safety of personnel and equipment.

[0054] The applicant also discovered that the prior art is afflicted with the following problem: the platform's hazardous operation is not limited in a state of overload, which can lead to a worsening overload situation. Therefore, in the embodiment of the Fig. 2 or the Fig. 4. An actuating element was added to limit movements of the work platform in an overload condition.

[0055] Fig. Figure 5 is a schematic representation of a third embodiment of a control device for preventing overloading of a work platform of a bridge inspection vehicle according to the present application. Compared with the embodiment of Fig. 4 contains the device in the embodiment of the Fig. 5 additionally an actuating element 6.

[0056] The actuating element 6 is connected to the overload prevention control unit 3 and also to the work platform.

[0057] The actuating element 6 is used to limit movements of the work platform according to the result of the comparison of the overload prevention control unit 3.

[0058] In one embodiment of the present application, the alarm device 4 is used to send a first alarm signal when the current load on the work platform exceeds 90% of the permissible load on the work platform or the current torque on the work platform exceeds 90% of the permissible torque on the work platform, and to send a second alarm signal when the current load on the work platform reaches the permissible load on the work platform or the current torque on the work platform reaches the permissible torque on the work platform.

[0059] In one embodiment of the present application, the actuating element 6 is used to restrict a rotational movement of the work platform towards the outside of the bridge plate when the current load on the work platform reaches the permissible load on the work platform, until the current load on the work platform is less than 90% of the permissible load on the work platform; and to restrict a rotational movement of the work platform towards the outside of the bridge plate when the current torque on the work platform reaches the permissible torque on the work platform, until the current torque on the work platform is less than 90% of the permissible torque on the work platform.

[0060] The embodiments described above in the present application limit dangerous movement of the work platform in an overload condition and therefore effectively prevent the overload situation from worsening, thus preventing phenomena such as vehicle rollover and platform breakage, etc., and thereby ensuring the safety of persons and the safety of equipment.

[0061] In one embodiment of the present application, the device further includes a display 7, as shown in Fig. 5 is shown.

[0062] The display 7 is connected to the overload prevention control unit 3 to display the current load on the work platform and the current torque of the work platform in real time.

[0063] This embodiment of the present application makes it easy for the user to monitor the current load on the work platform and the current torque of the work platform and to make appropriate adjustments in order to further ensure the safety of persons and the safety of the equipment.

[0064] In one embodiment of the present application, the alarm device 4 can be integrated into the display 7.

[0065] In a specific embodiment of the present application, the buzzer, which serves as an alarm device 4, can be integrated into the display 7.

[0066] In this specific embodiment, the display emits a buzzing alarm when the current load M on the work platform exceeds 90% of the permissible load M. ethe work platform, and the frequency of the buzzer also increases gradually as the load increases. When the current load M of the work platform is 100% of the permissible load M e When the work platform is reached, the display emits a buzzing alarm, the frequency of the buzzing is increased threefold, and movement of the work platform in the form of rotation towards the outside of the bridge plate is restricted until M<90%M e .

[0067] In this specific embodiment, the display emits a buzzing alarm when the current torque T b the work platform more than 90% of the permissible torque T e the work platform, and the frequency of the buzzer also increases gradually as the load increases. If the current torque T b the work platform 100% of the permissible torque T eWhen the work platform is reached, the display emits a buzzing alarm, the frequency of the buzzing is tripled, and movement of the work platform in the form of rotation towards the outside of the bridge plate is restricted until T e <90%T e .

[0068] The embodiment described above in the present application fully considers the characteristics of the working platform of a cantilever bridge inspection vehicle, examines the force state of key components of the working platform and the inclination of the lifting tower, and determines the load and torque of the working platform by calculating it using an algorithm that performs real-time monitoring of the working platform's load state and triggers an alarm regarding its load state. This effectively prevents phenomena such as vehicle rollover and platform breakage, etc., and thus ensures the safety of personnel and equipment during operation.

[0069] Fig. Figure 6 is a schematic diagram of a first embodiment of a control method for preventing overloading of a work platform of a bridge inspection vehicle within the scope of the present application. Preferably, the present embodiment is carried out by the control device for preventing overloading of a work platform of a bridge inspection vehicle of the present application. The method comprises the following steps:

[0070] Step 610, in which the first bolt axis sensor 1 measures the force F a at the first investigation point a in an axial direction of the expansion and contraction cylinder, wherein the first investigation point a is a joint between the expansion and contraction cylinder and the lifting tower;

[0071] Step 620, in which the second bolt axis sensor 2 measures the force F bat the second investigation point b in a vertical direction, wherein the second investigation point b is a joint between the work platform and the lifting tower;

[0072] Step 630, in which the overload prevention control unit 3 determines the current load on the work platform according to F a and F b determined;

[0073] In one embodiment of the present application, step 630 may include the overload prevention control unit 3 determining the current load on the work platform according to equation (1);

[0074] Step 640, in which the overload prevention control unit 3 compares the current load on the work platform with the permissible load on the work platform;

[0075] Step 650, in which the alarm device 4 sends out an alarm according to the result of the comparison.

[0076] In one embodiment of the present application, the alarm device 4 includes at least one of such alarm devices as a buzzer or an alarm lamp, etc.

[0077] In one embodiment of the present application, step 650 comprises: sending a first alarm signal when the current load on the work platform exceeds 90% of the permissible load on the work platform, and sending a second alarm signal when the current load on the work platform reaches the permissible load on the work platform, wherein the second alarm signal has a higher alarm level than the first alarm signal. For example, the second alarm signal can be distinguished from the first alarm signal by a light or a sound signal of a faster frequency.

[0078] In the control method for preventing overloading of a work platform of a bridge inspection vehicle according to this embodiment of the present application, the position of the bolt axis sensor is strategically arranged according to the load-bearing properties of the force measuring points, which enables accurate monitoring of the load on the work platform, strictly avoids overloading of the work platform and prevents the occurrence of phenomena such as vehicle rollover and platform breakage, etc., thus ensuring the safety of persons and the safety of the equipment.

[0079] A second embodiment of a control method for preventing overloading of a work platform of a bridge inspection vehicle according to the present application differs from the embodiment of the Fig. 6 in the following points.

[0080] Before step 630 of the embodiment of Fig. 6. The method of the second embodiment can also include a step 625 in which the two-axis tilt sensor 5 determines a degree of tilt of the lifting tower. In the second embodiment, step 630 can be in Fig. 6 specifically include the following: The overload prevention control unit 3 determines the current load on the work platform according to the inclination degree of the lifting tower, F a and F b .

[0081] In a specific embodiment of the present application, step 630 of the embodiment of Fig. 6 specifically includes the following: The overload prevention control unit 3 determines the current load on the work platform according to equation (2).

[0082] This embodiment of the present application fully takes into account the influence of the lifting tower's inclination, corrects the determined data, and thus further increases the accuracy of determining the work platform's load. Therefore, it is possible to avoid overloading the work platform even more rigorously and to additionally prevent phenomena such as vehicle rollovers and platform breakage, etc., thereby ensuring the safety of personnel and equipment.

[0083] A third embodiment of a control method for preventing overloading of a work platform of a bridge inspection vehicle according to the present application differs from the embodiment of the Fig. 6 and the method of the second embodiment in the following points.

[0084] Before step 650 of the embodiment of Fig. 6 The method of the third embodiment further includes: a step 641 in which the overload prevention control unit 3 determines the current torque of the work platform according to F a determined;

[0085] In one embodiment of the present application, step 641 may specifically include the following: The overload prevention control unit 3 determines the current torque of the work platform according to equation (3); a step 642 in which the overload prevention control unit 3 compares the current torque of the work platform with a permissible torque of the work platform;

[0086] In the third embodiment, the result of the comparison from step 650 of the embodiment of Fig. 6. The result of comparing the current load on the work platform with the permissible load on the work platform and the result of comparing the current torque on the work platform with the permissible torque on the work platform;

[0087] In the third embodiment, step 650 may include the following: the alarm device 4 sends a first alarm signal when the current load on the work platform exceeds 90% of the permissible load on the work platform or the current torque on the work platform exceeds 90% of the permissible torque on the work platform; and the alarm device 4 sends a second alarm signal when the current load on the work platform reaches the permissible load on the work platform or the current torque on the work platform reaches the permissible torque on the work platform.

[0088] This embodiment of the present application fully takes into account the influence of the lifting tower's inclination, corrects the determined data, and thus further increases the accuracy of determining the work platform's load. Therefore, it is possible to avoid overloading the work platform even more rigorously and to additionally prevent phenomena such as vehicle rollovers and platform breakage, etc., thereby ensuring the safety of personnel and equipment.

[0089] In one embodiment of the present application, the method may further include the following: The display 7 shows the current load on the work platform and the current torque of the work platform in real time.

[0090] This embodiment of the present application makes it easy for the user to monitor the current load on the work platform and the current torque of the work platform and to make appropriate adjustments in order to further ensure the safety of persons and the safety of the equipment.

[0091] A fourth embodiment of the control method for preventing overloading of a work platform of a bridge inspection vehicle according to the present application differs from the embodiment of the Fig. 6, the method of the second embodiment and the method of the third embodiment in the following points.

[0092] Step 650 may include the alarm device 4 sending an alarm according to the result of the comparison and the actuating element 6 restricting movements of the work platform.

[0093] In one embodiment of the present application, step 650 may specifically include: If the current load on the work platform exceeds 90% of the permissible load on the work platform, the alarm device 4 sends a first alarm signal; if the current load on the work platform reaches the permissible load on the work platform, the alarm device 4 sends a second alarm signal and the actuating element 6 restricts movement of the work platform in the form of rotation towards the outside of the bridge plate until the current load on the work platform is less than 90% of the permissible load on the work platform; If the current torque of the work platform is more than 90% of the permissible torque of the work platform, the alarm device 4 sends a first alarm signal; if the current torque of the work platform reaches the permissible torque of the work platform, the alarm device 4 sends a second alarm signal and the actuating element 6 restricts movement of the work platform in the form of rotation to the outside of the bridge plate until the current torque of the work platform is less than 90% of the permissible torque of the work platform.

[0094] The embodiments described above in the present application limit dangerous movement of the work platform in an overload condition and therefore effectively prevent the overload situation from worsening, thus preventing phenomena such as vehicle rollover and platform breakage, etc., and thereby ensuring the safety of persons and the safety of equipment.

[0095] In the above embodiment of the present application, the positions of the sensors are strategically arranged according to the load-bearing properties of the force measurement points of the work platform, so that the load on the work platform can be measured more accurately. This embodiment of the present application can not only measure the weight of the work platform but also obtain the value of the torque of the work platform, thereby ensuring that neither the weight nor the torque of the work platform exceeds a limit during the operation of the bridge inspection vehicle. The above embodiment of the present application fully takes into account the influence of the inclination of the lifting tower and corrects the determined data.This embodiment of the present application can therefore limit dangerous movement of the work platform in an overload condition and thus effectively prevent the overload situation from worsening.

[0096] The overload prevention control unit 3 described above can be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable logic gate array (FPGA), another programmable logic circuit, a discrete logic gate, transistor logic, discrete hardware components, or a suitable combination thereof.

[0097] The present application has been described in detail to this extent. To avoid obscuring the idea of ​​the present application, some details that are generally known in the prior art have not been described. A person skilled in the art can fully understand, based on the above description, how to implement the technical solution disclosed herein.

[0098] The person skilled in the art will understand that all or some of the steps of the foregoing embodiments can be performed by hardware or by issuing instructions to associated hardware from a program stored in a computer-readable storage medium, which may be a read-only memory, a floppy disk, a CD, etc.

[0099] The description of this application is intended to provide examples and explanations, and not to be exhaustive or to limit this application to the disclosed forms. Many modifications and variations are obvious to the person skilled in the art. The selection and description of these embodiments serve the purpose of better explaining the principle and practical implementation of this application and enable the person skilled in the art to understand this application in such a way as to envisage different embodiments with different modifications for the respective applications.

Claims

[1] Control procedure to avoid overloading of a work platform of a bridge inspection vehicle, comprising the steps: Determining (610) a force F a at a first detection point a in an axial direction of an expansion and contraction cylinder, wherein the first detection point a is a joint between the expansion and contraction cylinder and a lifting tower; Determining (620) a force F b at a second investigation point b in a vertical direction, wherein the second investigation point b is a joint between the work platform and the lifting tower; Determining the degree of inclination of the lifting tower; Determine (630) the current load on the work platform according to - Inclination degree of the lifting tower, - Fa and - Fb; (640) compare the current load on the work platform with a permissible load on the work platform; Sending (650) an alarm according to the result of the comparison. [2] The method according to claim 1, further comprising the following steps prior to sending an alarm according to the result of the comparison: Determining the current torque of the work platform according to F a ; Comparing the current torque of the work platform with a permissible torque of the work platform; where the result of the comparison includes the result of comparing the current load on the work platform with the permissible load on the work platform and the result of comparing the current torque on the work platform with the permissible torque on the work platform. [3] The method according to claim 2, further comprising: Display of the current load on the work platform and the current torque of the work platform in real time. [4] The method according to claim 2, wherein sending (650) an alarm according to the result of the comparison comprises sending an alarm according to the result of the comparison and restricting the movements of the work platform. [5] The method according to claim 4, comprising sending (650) an alarm and restricting movements of the work platform according to the result of the comparison: Emitting a first alarm signal when the current load on the work platform exceeds 90% of the permissible load on the work platform, and emitting a second alarm signal and restricting movement of the work platform in the form of rotation to the outside of the bridge plate when the current load on the work platform reaches the permissible load on the work platform, until the current load on the work platform is less than 90% of the permissible load on the work platform; Emitting a first alarm signal when the current torque of the work platform is more than 90% of the permissible torque of the work platform, and emitting a second alarm signal and restricting movement of the work platform in the form of rotation to the outside of the bridge plate when the current torque of the work platform reaches the permissible torque of the work platform, until the current torque of the work platform is less than 90% of the permissible torque of the work platform. [6] Control device for preventing overloading of a work platform of a bridge inspection vehicle, comprising: a first bolt axis sensor (1) for determining a force F aat a first detection point a in an axial direction of an expansion and contraction cylinder, wherein the first detection point a is a joint between the expansion and contraction cylinder and a lifting tower; a second bolt axis sensor (2) for determining a force F b at a first investigation point b in a vertical direction, wherein the second investigation point b is a joint between the work platform and the lifting tower; a two-axis tilt sensor (5) for determining the degree of tilt of the lifting tower; an overload prevention control unit (3) for determining the current load on the work platform according to - Inclination degree of the lifting tower, - F a and - F b and to compare the current load on the work platform with a permissible load on the work platform; and an alarm device (4) for sending an alarm according to the result of the comparison of the overload prevention control unit (3). [7] The device according to claim 6, wherein the overload prevention control unit (3) also provides a current torque of the work platform according to F a determines and compares the current torque of the work platform with a permissible torque of the work platform; wherein the result of the comparison includes the result of comparing the current load of the work platform with the permissible load of the work platform and the result of comparing the current torque of the work platform with the permissible torque of the work platform. [8] The device according to claim 7, further comprising a display (7) for displaying the current load on the work platform and the current torque of the work platform in real time. [9] The device according to claim 7, further comprising a drive element (6) for limiting movements of the work platform according to the result of the comparison of the overload prevention control unit. [10] The device according to claim 9, wherein the alarm device (4) emits a first alarm signal when the current load on the work platform exceeds 90% of the permissible load on the work platform or the current torque on the work platform exceeds 90% of the permissible torque on the work platform, and a second alarm signal when the current load on the work platform reaches the permissible load on the work platform or the current torque on the work platform reaches the permissible torque on the work platform; and wherein the drive element (6) restricts movement of the work platform in the form of rotation to the outside of the bridge plate when the current load on the work platform reaches the permissible load on the work platform, until the current load on the work platform is less than 90% of the permissible load on the work platform;and it restricts movement of the work platform in the form of rotation towards the outside of the bridge plate when the current torque of the work platform reaches the permissible torque of the work platform, until the current torque of the work platform is less than 90% of the permissible torque of the work platform.

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