Loading truck crane

Abstract

To provide a loading type truck crane adopting a high versatile structure which can bring out the most of capacity of a crane device while securing the safety of work without excessively restricting working capacity in a forward region and can be adopted to various types of loading type truck cranes.SOLUTION: A loading type truck crane 10 includes an inclination angle detector 13 for measuring an inclination angle of a vehicle body of the loading type truck crane 10, a control device 12, and a warning device 14. When a boom 32 constituting a crane device 21 is positioned in a forward region, the control device 12 activates at least any one of a function for regulating the movement of the crane device 21 and a function of operating the warning device 14 based on an inclination signal. This constitution can prevent excessive restriction on the working capacity in the forward region. Accordingly, the capacity of the crane device can be maximized while securing the safety of the work.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a loaded truck crane. More specifically, it relates to a loaded truck crane in which the rating of the crane apparatus is determined by the swing position of the boom. In this specification, unless otherwise specified, the front, rear, left, and right directions are based on the front, rear, left, and right of the operator of the loaded truck crane when the operator is seated in the driver's cab of the vehicle body. [Background technology]

[0002] A loaded truck crane is a vehicle with a crane device mounted on a truck with a loading platform. The crane device is installed between the driver's cab and the loading platform. The crane device is operated by drawing power from a driving motor. When using a loaded truck crane, the crane device's boom rotates around the base of the crane device, and the boom is raised and lowered, while the winch raises and lowers the hook. This action lifts and transports cargo.

[0003] Load-mounted truck cranes are equipped with outrigger devices to ensure stability during crane operations. In most cases, when performing crane operations, users of loaded truck cranes extend the outriggers that make up the outrigger device from the vehicle body and perform the work with the outriggers in a grounded position.

[0004] The rated load of a loaded truck crane is calculated from the capacity (empty stability) of the crane when there is no load on the platform and at the least stable swing position within the side area, and the capacity (crane strength performance) determined from the strength of the crane's structure. The graph in Figure 3 of Patent Document 1 is an example of a rated load calculated in this way, and Patent Document 1 discloses a configuration in which an alarm is sounded or operation is stopped depending on the ratio of the lifting load to the rated load. In the front area of ​​the loaded truck crane described in Patent Document 1, the rated load is set to 25% of the rated load of the crane device, taking into account its structure.

[0005] The reason why the rated load in the front area is set to 25% of the rated load of the crane device as mentioned above is that, due to the structure of a loaded truck crane, the loading platform is installed at the rear of the crane device, and the above rated load is based on the assumption that no load is placed on this platform.

[0006] In response to this, Patent Document 2 discloses a loaded truck crane equipped with rear outrigger units, in which a function for restricting the operation of the crane unit is activated using a ground reaction force signal from the rear jack. This is based on the idea that when there is a load on the loading platform, the load is located behind the front outrigger units, so that the stability of the loaded truck crane is increased and restrictions in the front area should be relaxed to approach the crane's strength performance. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 9-86873 [Patent Document 2] Japanese Patent Application Publication No. 2019-156579 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the rated load in the graph of Figure 3 of Patent Document 1 is calculated in advance taking into account the capacity at the swing position with the worst stability in the side area, so there is a very large margin of safety. Furthermore, in the front area of ​​the loaded truck crane, the rated load is set to 25% of the crane device's rated load, taking into account its structure. Therefore, the loaded truck crane The problem is that the load ratings of the are excessively limited, especially in the front area.

[0009] Furthermore, Patent Document 2 uses the ground reaction force signal of the rear jack of the rear outrigger device, but this configuration can only be adopted in models that use rear outrigger devices, and has the problem of being less versatile.

[0010] In view of the above circumstances, the present invention has an object to provide a loaded truck crane that maximizes the capacity of the crane apparatus while ensuring work safety and does not excessively limit the work capacity in the forward area, and that employs a highly versatile configuration that can be used with various types of loaded truck cranes. [Means for solving the problem]

[0011] The loaded truck crane of the first invention is a loaded truck crane equipped with a loading platform and a crane apparatus, and is further equipped with a tilt angle detector that measures the tilt angle of the body of the loaded truck crane, a control device that receives a tilt signal from the tilt angle detector, and an alarm connected to the control device, wherein the control device performs at least one of a function to restrict the operation of the crane apparatus or a function to activate the alarm based on the tilt signal when a boom that constitutes the crane apparatus is located in a forward area. The loaded truck crane of a second invention is the same as that of the first invention, characterized in that the tilt angle detector is provided in the crane device. The loaded truck crane of a third invention is the same as that of the first invention, characterized in that the tilt angle detector is provided inside a housing of the control device. The loaded truck crane of the fourth invention is characterized in that, in any of the first to third inventions, the control device calculates, from the tilt signal, the reaction force applied to the rear wheels of the loaded truck crane when the boom of the crane device of the loaded truck crane is located in a forward area, and when the reaction force becomes equal to or less than a predetermined value, activates at least one of the function of restricting the operation of the crane device or the function of activating the alarm. The loaded truck crane of the fifth invention is the fourth invention, and is characterized in that the control device calculates the reaction force as F1+k×L×sin((θ3-θ2)-θ1)) (F1: reaction force of the rear wheels in a working state with the crane device in the stored position, k: spring constant of the chassis of the rear wheels, L: distance in a plan view between the front-to-rear center of the outrigger device provided on the loaded truck crane and the front-to-rear center of the rear wheels, θ1: tilt angle in a working state with the crane device in the stored position, θ2: tilt angle in a drivable state of the loaded truck crane, θ3: tilt angle in a working state in the front area). [Effects of the Invention]

[0012] According to the first aspect of the present invention, the tilt signal from the tilt angle detector causes the control device to activate a function to restrict the operation of the crane when the boom of the crane is positioned in the forward area, thereby preventing excessive restrictions on the work capacity in the forward area. This makes it possible to maximize the capacity of the crane while ensuring work safety. Furthermore, because the tilt angle detector is used, the mechanism of the loaded truck crane is not limited to cases where it has a rear jack, etc. According to the second aspect of the present invention, since the tilt angle detector is provided on the crane device, there is no need to install the tilt angle detector on the general-purpose truck side, and the number of assembly steps at the final assembly manufacturer of the loaded truck crane can be reduced. According to the third invention, since the inclination angle detector is provided inside the housing of the control device, the housing of the control device has high environmental resistance, such as being waterproof, so there is no need to increase the environmental resistance of the inclination angle detector alone, thereby reducing costs. According to the fourth aspect of the present invention, the reaction force of the rear wheels when the boom of the crane device is located in the forward area is calculated from the tilt signal, so that the value of the reaction force applied to the rear wheels can be obtained with high accuracy. According to the fifth aspect of the present invention, the reaction force is calculated using a predetermined formula, so that the value of the reaction force applied to the rear wheels can be obtained with higher accuracy. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a control circuit diagram of a loaded truck crane according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the loading truck crane of FIG. 1. [Figure 3] FIG. 2 is a hydraulic circuit diagram of the loading truck crane of FIG. 1. [Figure 4] FIG. 2 is an explanatory diagram of a working area of ​​the loading truck crane of FIG. 1. [Figure 5] 2 is an explanatory diagram of a control method for the loaded truck crane of Fig. 1. (A) is an explanatory side view of the working state of the crane device 21 in the stored position, (B) is an explanatory side view of the loaded truck crane in the travelable state, and (C) is an explanatory side view of the working state in the front area. [Figure 6] FIG. 2 is an operation flow diagram of the loading truck crane of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Next, an embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below is an example of a loaded truck crane for embodying the technical concept of the present invention, and the present invention does not limit the loaded truck crane to the following. Note that the size or positional relationship of the components shown in each drawing may be exaggerated for clarity of explanation.

[0015] First Embodiment (Loading truck crane 10) FIG. 2 shows a side view of the loaded truck crane 10 according to the first embodiment of the present invention. As shown in FIG. 2, the loaded truck crane 10 has a crane device 21 mounted on a vehicle frame 29 between a driver's cab 27 and a loading platform 28 of a general-purpose truck 20. The general-purpose truck 20 has front wheels 22 symmetrically provided on the left and right. Furthermore, the general-purpose truck 20 has rear wheels 23 symmetrically provided on the left and right. The "vehicle body" of the loaded truck crane 10 refers to the general-purpose truck 20.

[0016] As shown in Fig. 2, the crane apparatus 21 includes a base 30 fixed on a vehicle frame 29, a post 31 rotatably mounted on the base 30, a boom 32 mounted on the upper end of the post 31 so as to be able to be raised and lowered, and outrigger units 33 mounted on the base 30 and extending outward to the left and right from the base 30. That is, the outrigger units 33 are located between the operator's cab 27 and the loading platform 28 when viewed from the side. Hydraulic jacks 38 are mounted on the left and right ends of the outrigger units 33, respectively (see Fig. 4).

[0017] A winch is built into the post 31. A wire rope is led from this winch to the tip of the boom 32 and passed through a pulley at the tip of the boom 32 to a hook 34, which is then hung from the tip of the boom 32.

[0018] The crane apparatus 21 is hydraulically driven by a hydraulic circuit 40. A group of levers 35 for operating this hydraulic circuit 40 is provided on both the left and right sides of the base 30. In addition, a control device 12 is provided on the base 30 to electrically control the hydraulic circuit 40 and control the work vehicle.

[0019] (Hydraulic circuit 40) 3 shows a hydraulic circuit diagram of the loaded truck crane 10 according to this embodiment. As shown in FIG. 3, the hydraulic circuit 40 of the crane apparatus 21 mainly includes a hydraulic valve unit 41, a hydraulic pump 43 that supplies hydraulic oil from a tank 42 to the hydraulic valve unit 41, a main oil passage 44 that connects the hydraulic pump 43 and the hydraulic valve unit 41, a return oil passage 45 that connects the hydraulic valve unit 41 and the tank 42, a plurality of crane actuators 46 for raising and lowering the crane apparatus 21, extending and retracting the boom 32, rotating the boom 32, and lifting and lowering the winch, and two jacks 38. The crane actuator 46 and the jacks 38 are connected to the hydraulic valve unit 41.

[0020] The hydraulic pump 43 is connected to the engine 36 of the utility truck 20 via a PTO (power take-off) device and is driven by the engine 36 .

[0021] The hydraulic valve unit 41 is provided with a boom extension / retraction control valve 47a, a winch control valve 47b, a boom hoist control valve 47c, a boom rotation control valve 47d, a right jack control valve 48a, and a left jack control valve 48b. The boom extension / retraction control valve 47a is connected to the boom extension / retraction actuator 46a, the winch control valve 47b is connected to the winch hydraulic motor 46b, the boom hoist control valve 47c is connected to the boom hoist actuator 46c, and the boom rotation control valve 47d is connected to the boom rotation actuator 46d. The right jack control valve 48a is connected to the right jack 38a located on the right side, and the left jack control valve 48b is connected to the left jack 38b located on the left side.

[0022] These switching control valves are each equipped with a lever, and by manually operating the lever, it is possible to switch the direction and flow rate of the hydraulic oil supplied from the hydraulic pump 43. The levers attached to the control valves are provided on both the left and right sides of the base 30 as a lever group 35 (see FIG. 2).

[0023] The control device 12 is also connected to the ECU (engine control unit) of the engine 36, and is configured to be able to control at least the rotation speed of the engine 36. By controlling the rotation speed of the engine 36, the control device 12 can control the rotation speed of the hydraulic pump 43, and can adjust the discharge amount of the hydraulic pump 43.

[0024] (Control circuit) 1 shows a control circuit diagram of a loaded truck crane 10 according to this embodiment. The input side of the control device 12 is electrically connected to a tilt angle detector 13, a boom length detector 15, a boom rotation angle detector 16, a boom hoist angle detector 17, and a hoisting support force detector 18. The output side of the control device 12 is electrically connected to an alarm 14, a boom extension / retraction control valve 47a, a winch control valve 47b, a boom hoist control valve 47c, a boom rotation control valve 47d, a right jack control valve 48a, and a left jack control valve 48b.

[0025] The inclination angle detector 13 is a single- or double-axis inclination sensor for detecting the inclination angle of the loaded truck crane 10. In this embodiment, the inclination angle detector 13 is fixed to the base 30 of the crane apparatus 21. The inclination angle detector 13 may be a mechanical type using a bubble or a pendulum, or may be a potentiometer or magnetic type. It is preferable to use an inclination sensor (ACS) using MEMS technology or an inclination sensor (AGS) using an electrolyte tilt, particularly for ease of digital processing. When a single-axis inclination angle detector 13 is used, it is oriented to measure the inclination angle in the longitudinal direction of the vehicle. When a double-axis inclination angle detector 13 is used, only one detector is required, and it is oriented to measure the inclination angle in the longitudinal direction and the lateral direction of the vehicle.

[0026] The inclination angle detector 13 is preferably fixed to the base 30 of the crane apparatus 21, but may be fixed to another part. For example, the inclination angle detector 13 may be fixed inside the housing of the control device 12 or fixed to the vehicle frame 29.

[0027] By providing the inclination angle detector 13 on the crane device 21, there is no need to install the inclination angle detector 13 on the general-purpose truck 20 side, and the final assembly work process of the loaded truck crane 10 at the assembly manufacturer can be reduced.

[0028] Furthermore, when the inclination angle detector 13 is installed inside the housing of the control device 12, the housing of the control device 12 has high environmental resistance, such as being waterproof, so there is no need to increase the environmental resistance of the inclination angle detector 13 alone, thereby reducing costs.

[0029] The boom length detector 15 is for detecting the length of the boom 32, and is, for example, a cord payout length detector. The cord payout length detector detects the payout length of the measuring cord by detecting the amount of rotational displacement of the cord winder.

[0030] The boom rotation angle detector 16 is used to detect the rotation angle of the boom 32 and is disposed on the base side of the post 31. For example, the boom rotation angle detector 16 is a potentiometer. A rotary encoder may be used instead of this potentiometer.

[0031] The boom hoist angle detector 17 detects the hoisting angle of the boom 32 and is located at the base of the boom 32. For example, the boom hoist angle detector 17 is a potentiometer. A rotary encoder may be used instead of the potentiometer.

[0032] The alarm 14 is provided to notify the user of the loading truck crane 10 of a predetermined condition, such as when the lifting load exceeds the rated load. In this embodiment, the alarm 14 is provided in the crane device 21.

[0033] The boom hoisting support force detector 18 is provided to detect the load suspended from the hook 34. In this embodiment, the boom hoisting support force detector 18 is a differential pressure gauge provided on the boom hoisting cylinder. The differential pressure detected by the boom hoisting support force detector 18 is output to the control device 12.

[0034] (work area) Figure 4 is an explanatory diagram of the working area of ​​the loaded truck crane 10 according to this embodiment. Figure 4 shows a plan view of the loaded truck crane 10. In this embodiment, the loaded truck crane 10 is provided with an outrigger unit 33 near the crane unit 21, i.e., between the driver's cab 27 and the loading platform 28. The user of the loaded truck crane 10 lifts or lowers a load with the outrigger unit 33 fully extended outward.

[0035] The weight of the load that the loaded truck crane 10 can safely load and unload varies depending on the angle in the horizontal plane of the boom 32 that constitutes the crane device 21, i.e., the rotation angle. Generally, the rated load of the loaded truck crane 10 is set for each of the following three areas: the rear area, the side area, and the front area. In a plan view, the rear area is the area (the side with the smaller angle formed by the two line segments) between the center of rotation of the boom 32 and the center of each of the two rear wheels 23 on the left and right (hereinafter sometimes referred to as the "right rear wheel center CR" and the "left rear wheel center CL").

[0036] The lateral area is the area between the line segment connecting the rotation center of the boom 32 and the right rear wheel center CR and the line segment connecting the rotation center of the boom 32 and the right jack 38a (the side where the angle formed by the two line segments is smaller), or the area between the line segment connecting the rotation center of the boom 32 and the left rear wheel center CL and the line segment connecting the rotation center of the boom 32 and the left jack 38b (the side where the angle formed by the two line segments is smaller).

[0037] The forward region is the region between the line segment connecting the center of rotation of the boom 32 and the right jack 38a and the line segment connecting the center of rotation of the boom 32 and the left jack 38b (the region where the angle formed by the two line segments is smaller). In this embodiment, the three regions are defined as above, but the definitions of these regions may differ depending on the configuration of the loaded truck crane 10. Furthermore, since the boundaries of each region are determined by a signal from the boom rotation angle detector 16, the positions may differ strictly from those defined above.

[0038] (Control method when using tilt angle detector 13) Fig. 5 shows an explanatory diagram illustrating an example of a control method when the tilt angle detector 13 is used. Figs. 5(A) to 5(C) are views of the loaded truck crane 10 as seen from the side, Fig. 5(A) is an explanatory diagram showing a state in which the loaded truck crane 10 has stopped traveling, the outrigger units 33 have been extended in the left and right directions, and the boom 32 of the crane unit 21 has been positioned in a stored position in the rear area (an explanatory diagram of the working state of the crane unit 21 in the stored position), Fig. 5(B) is an explanatory diagram showing a state in which the loaded truck crane 10 has retracted the outrigger units 33 and is ready to travel (an explanatory diagram of the loaded truck crane 10 in the state ready to travel), and Fig. 5(C) is an explanatory diagram showing a state in which the loaded truck crane 10 has stopped traveling, the outrigger units 33 have been extended outward in the left and right directions, and the boom of the crane unit 21 is positioned in the front area (an explanatory diagram of the working state in the front area).

[0039] In the loaded truck crane 10, a tilt angle detector 13 is used to register several parameters in advance in the control device 12 in order to, for example, regulate the operation of the crane device 21 in the forward area. The registered parameters include the distance L, in a plan view, between the front-to-rear center of the outrigger device 33 and the center of the rear wheels 23, and the spring constant k of the chassis used in the rear wheels 23. The distance L and the spring constant k can be registered in advance depending on the vehicle type of the general-purpose truck 20.

[0040] Next, the rear wheel reaction force F1 and first tilt angle θ1 in the state shown in FIG. 5(A) are registered. These parameters are registered as detected values ​​when all planned equipment, such as the crane apparatus 21, is mounted on the general-purpose truck 20. These parameters are measured after the outrigger apparatus 33 is extended outward to the left and right and it is confirmed that the crane apparatus 21 is ready for use. The first tilt angle θ1 is measured by the tilt angle detector 13 installed on the loaded truck crane 10. The rear wheel reaction force F1 is measured by placing the rear wheels 23 on a load measuring device. If a load detector or the like is installed on the axle of the rear wheels 23, the detected value from the load detector can also be used for the rear wheel reaction force F1.

[0041] As shown in FIG. 5, the first tilt angle θ1 is defined such that, when the loaded truck crane 10 is viewed from the left, the horizontal axis passing through the intersection of the top surface of the vehicle frame 29 and the center of the front-to-rear direction of the base 30 is 0°, and the direction in which the top surface of the vehicle frame 29 rotates clockwise from there is a positive value.

[0042] Next, the second tilt angle θ2 in the state shown in Figure 5(B) is registered. Like the first tilt angle θ1, the second tilt angle θ2 is also registered as a detected value when all planned equipment, such as the crane unit 21, is attached to the general-purpose truck 20. This second tilt angle θ2 is measured when the outrigger unit 33 is retracted and the loaded-type truck crane 10 is ready to travel. Like the first tilt angle θ1, the second tilt angle θ2 is measured by the tilt angle detector 13 installed on the loaded-type truck crane 10, and is defined so that a positive value is obtained when the top surface of the vehicle frame 29 rotates clockwise when viewed from the left of the loaded-type truck crane 10.

[0043] Next, the reaction force F2 applied to the rear wheels 23 of the loaded truck crane 10 when the boom 32 of the crane apparatus 21 is located in the forward region as shown in FIG. 5(C) is calculated using the inclination angle of the inclination angle detector 13. Specifically, in the state shown in FIG. 5(C), the third inclination angle θ3 of the inclination angle detector 13 is detected, and the reaction force F2 in the working state in the forward region is calculated using the following equation 1. Note that while FIG. 5(C) shows a state where no load is on the loading platform 28, the third inclination angle θ3 may be detected when a load is present. In particular, while the present specification describes the case where the boom 32 is located in the forward region, when a load is present on the loading platform 28, the third inclination angle θ becomes larger, which can increase the working capacity in the forward region, so it is important to use the third inclination angle θ3 when a load is present. Like the first tilt angle θ1 and the second tilt angle θ2, the third tilt angle θ3 is defined so that the direction in which the top surface of the vehicle frame 29 rotates clockwise when viewed from the left of the loaded truck crane 10 is a positive value.

[0044] (Number 1) F2=F1+k×L×sin((θ3-θ2)-θ1))

[0045] k: Spring constant of the chassis for the rear wheels 23. L: The distance in a plan view between the front-to-rear center of the outrigger device 33 provided on the loading truck crane 10 and the front-to-rear center of the rear wheel 23. θ1: First tilt angle: The tilt angle of the crane device 21 in the working state at the stored position. θ2: Second tilt angle. The tilt angle when the loading truck crane 10 is in a travelable state. θ3: Third tilt angle. The tilt angle in the front area when working.

[0046] When the reaction force F2 calculated by this formula becomes smaller than a predetermined threshold value Ft, the control device 12 activates at least one of the functions of restricting the operation of the crane device 21 and activating the alarm 14.

[0047] Since the reaction force F2 of the rear wheel 23 when the boom 32 of the crane device 21 is located in the forward region is calculated from the tilt signal, the value of the reaction force F2 applied to the rear wheel 23 can be obtained with high accuracy.

[0048] Since the reaction force F2 is calculated using a predetermined formula, the value of the reaction force F2 applied to the rear wheel 23 can be obtained with higher accuracy.

[0049] (Operation flow) 6 shows an operation flow diagram of the loaded truck crane 10 according to this embodiment. First, in step 01 (hereinafter referred to as S01), the control device 12 of the loaded truck crane 10 acquires information on the rotation angle of the boom 32 from the boom rotation angle detector 16.

[0050] In S02, the control device 12 determines whether the boom 32 is located in the front area. If the control device 12 determines that the boom 32 is not located in the front area, the boom 32 is located in the side area or the rear area, and the control device 12 performs normal operation in the side area or the rear area.

[0051] If the control device 12 determines in S02 that it is located in the forward area, the boom 32 is located in the forward area, and therefore the control device 12 proceeds to S03.

[0052] In S03, the control device 12 acquires the value of the third tilt angle θ3 from the tilt angle detector 13. In S04, the control device 12 calculates the reaction force F2 of the rear wheel 23 using the third tilt angle θ3, and if it determines that the value of this reaction force F2 is equal to or less than the threshold value Ft, the control device 12 proceeds to S05.

[0053] In S05, the control device 12 restricts the operation of the crane apparatus 21 in the forward area using the boom hoist control valve 47c or the like. Specifically, the control device 12 stops the hoisting operation of the boom 32 or stops the swinging operation of the boom 32. The control device 12 may also restrict the operation by slowing down the speed of these operations. In addition to this operation restriction, the control device 12 activates the alarm 14 to notify the user of the loaded truck crane 10 that operation restriction has been applied in the forward area. Alternatively, the control device 12 may activate only the alarm 14.

[0054] If the control device 12 determines in S04 that the numerical value of the reaction force F2 is greater than the threshold value Ft, the control device 12 does not restrict the operation of the crane device 21 in the front area in S05.

[0055] In response to the tilt signal from the tilt angle detector 13, the control device 12 activates a function to restrict the operation of the crane apparatus 21 when the boom 32 of the crane apparatus 21 is in the forward area, thereby preventing excessive restrictions on the work capacity in the forward area. This ensures work safety while maximizing the capacity of the crane apparatus 21. Furthermore, because the tilt angle detector 13 is used, the mechanism of the loaded truck crane 10 is not limited to cases where it has a rear jack, etc.

[0056] (Other embodiments) In the first embodiment, the reaction force F2 is calculated from the third tilt angle θ3 of the tilt angle detector 13, but the control method using the third tilt angle θ3 of the tilt angle detector 13 is not limited to this. For example, it is also possible to make the control device 12 activate a predetermined function when the value of the third tilt angle θ3 becomes smaller than a predetermined value.

[0057] Furthermore, the concept of the present invention can be applied not only to a loaded truck crane 10 in which the crane apparatus 21 is provided between the driver's cab 27 and the loading platform 28 of the general-purpose truck 20, but also to a loaded truck crane 10 in which the crane apparatus 21 is provided on the rear side of the loading platform 28. In this case, when the boom constituting the crane apparatus 21 is in the rear area, at least one of the functions of restricting the operation of the crane apparatus 21 or activating an alarm is activated based on the tilt signal. [Explanation of symbols]

[0058] 10 Loading truck crane 12 Control device 13 Tilt angle detector 14 Alarm 21 Crane equipment 23 rear wheel 27 Driver's cab 28 Cargo bed 32 Boom 33 Outrigger device

Claims

1. A loading truck crane equipped with a loading platform and a crane device, a tilt angle detector for measuring the tilt angle of the vehicle body of the loading truck crane; a control device that receives a tilt signal from the tilt angle detector; an alarm connected to the control device; is provided, the control device, when a boom constituting the crane apparatus is located in a forward area, activates at least one of a function to restrict the operation of the crane apparatus or a function to activate the alarm, based on the tilt signal; A loaded truck crane characterized by:

2. The tilt angle detector provided on the crane apparatus, 2. The loading truck crane according to claim 1.

3. The tilt angle detector The control device is provided inside a housing thereof.

2. The loading truck crane according to claim 1.

4. The control device calculating, from the tilt signal, a reaction force applied to a rear wheel of the loaded truck crane when the boom of the crane device of the loaded truck crane is located in a forward region; When the reaction force becomes equal to or less than a predetermined value, at least one of a function of restricting the operation of the crane apparatus and a function of activating the alarm is activated.

4. The loading truck crane according to claim 1, wherein the loader is a hoist.

5. The control device The reaction force is expressed as F1 + k × L × sin((θ3 - θ2) - θ1)) (F1: reaction force of the rear wheel in a working state at the storage position of the crane device, k: spring constant of the chassis of the rear wheels, L: the distance in a plan view between the front-rear center of the outrigger device provided on the loading truck crane and the front-rear center of the rear wheel, θ1: tilt angle in a working state at the storage position of the crane device, θ2: the tilt angle of the loading truck crane in a travelable state, θ3: tilt angle in the working state in the front area), 5. The loading truck crane according to claim 4.

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