Arm locking device, locking method, unlocking method and fire truck

Abstract

The present invention relates to an arm locking device, a locking method, an unlocking method and a fire truck, and belongs to the technical field of fire trucks. The present invention provides an arm locking device, comprising a folding arm and a locking device, wherein the folding arm comprises a first folding arm and a second folding arm, wherein one end of the first folding arm is mounted on a turntable and the other end is hinged to the second folding arm; the locking device comprises a detection mechanism, a hydraulic control system and a locking mechanism, wherein the detection mechanism is used to detect the unfolding angle of the first folding arm, and the hydraulic control system is used to control the locking / unlocking of the locking mechanism according to the unfolding angle of the first folding arm detected by the detection mechanism, and the locking mechanism is used to lock / unlock the first folding arm and the second folding arm. The present invention can realize that when the No. 2 folding arm is in a heavy-load non-working area, the locking mechanism is automatically locked; when the No. 2 folding arm enters a light-load working area from the heavy-load non-working area, the locking mechanism is automatically unlocked.

Description

Technical Field

[0001] The present invention relates to an arm locking device, a locking method, an unlocking method and a fire truck, belonging to the technical field of fire trucks. Background Art

[0002] Most fire trucks in the prior art adopt a folding arm structure. When not raised, the folding arms overlap together, and when raised, the folding arms will unfold one by one.

[0003] like Figure 1 As shown, the folding arm frame includes a first folding arm and a second folding arm. One end of the first folding arm is mounted on a turntable, and the other end is hinged to the second folding arm. An extension and retraction cylinder is connected between the front ends of the first folding arm and the second folding arm.

[0004] The folding arm unfolding process is as follows Figure 2 and Figure 3 As shown, when the first folding arm is unfolding, the second folding arm is in a suspended state, and under the action of gravity G, a torque relative to the connection hinge is generated.

[0005] When the second folding arm is subjected to a large gravitational torque, it typically remains in the area where the first folding arm's deployment angle α is relatively small. During this time, the second folding arm is in a non-operating state and cannot be deployed, otherwise it would collide with the vehicle body. This area is defined as the heavy-load non-operating zone. Only after the α angle is expanded beyond a certain value does the second folding arm enter the operating zone and begin deploying. At this point, the gravitational torque has been significantly reduced, and the extension and retraction cylinder only requires a very small pulling force F to balance the gravitational torque. This area is defined as the light-load operating zone.

[0006] When the deployment angle α of the first folding arm is small, the gravitational moment of the second folding arm is relatively large. At this time, the deployment cylinder will be subjected to a large pulling force F, which will pull the second folding arm to ensure that the second folding arm is in a retracted state and prevent it from being deployed under the action of gravity; as the angle α increases, the gravitational moment of the second folding arm becomes smaller and smaller, and the cylinder pulling force F will also become smaller and smaller.

[0007] The existing solution is to increase the diameter of the extension and retraction cylinder and increase the tension F of the extension and retraction cylinder so that the gravity moment is balanced during the folding arm expansion process.

[0008] The existing solutions have the following disadvantages:

[0009] (1) When the extension and retraction cylinder is thickened, the weight of the vehicle increases, which will cause the vehicle to be overweight and affect the vehicle's driving performance.

[0010] (2) After the extension and retraction cylinder is thickened, the required layout space is larger, and the connection hinge needs to be raised too high to leave enough installation space, which will cause the vehicle to be too high and affect the vehicle's driving performance.

[0011] (3) The extension and retraction cylinder can only exert force at the root of the folding arm. The deflection of the folding arm itself and the hinge gap will cause its head to still droop, affecting the vehicle's deployment performance.

[0012] The above shortcomings are more obvious when the height of the fire truck is higher and the folding arms are longer or more numerous.

[0013] The information disclosed in this background section is only intended to enhance understanding of the overall background of the invention and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to a person of ordinary skill in the art. Summary of the Invention

[0014] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an arm locking device, a locking method, an unlocking method and a fire truck, so as to realize automatic locking of the fire truck arm in a heavy-load non-working area and automatic unlocking in a light-load working area.

[0015] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0016] In one aspect, the present invention provides an arm locking device, comprising a folding arm and a locking device, wherein the folding arm comprises a first folding arm and a second folding arm, wherein one end of the first folding arm is mounted on a turntable and the other end is hinged to the second folding arm;

[0017] The locking device includes a detection mechanism, a hydraulic control system and a locking mechanism. The detection mechanism is used to detect the unfolding angle of the first folding arm. The hydraulic control system is used to control the locking / unlocking of the locking mechanism according to the unfolding angle of the first folding arm detected by the detection mechanism. The locking mechanism is used to lock / unlock the first folding arm and the second folding arm.

[0018] Furthermore, the detection mechanism includes a detection rod and a guide rail, the detection rod is mounted on the first folding arm, and the guide rail is mounted on the turntable. When the unfolding angle of the first folding arm is less than α, the detection rod abuts against the guide rail.

[0019] Furthermore, the detection mechanism includes a detection rod and a guide rail, the detection rod is mounted on the turntable, and the guide rail is mounted on the first folding arm. When the unfolding angle of the first folding arm is less than α, the detection rod abuts against the guide rail.

[0020] Furthermore, the hydraulic control system includes a stroke valve, a balancing valve, a locking cylinder and a pipeline. The stroke valve is connected to the balancing valve through a pipeline, and the balancing valve is connected to the locking cylinder through a pipeline. The stroke valve has P, A, B, and T ports, and the locking cylinder has a rod chamber and a rodless chamber.

[0021] Furthermore, the locking mechanism includes a limiting device and a locking pin, the limiting device is installed on the second folding arm, and the locking pin is installed on the first folding arm.

[0022] In another aspect, the present invention provides a locking method for an automatic arm locking device, comprising:

[0023] When the unfolding angle of the first folding arm is less than α, the detection rod presses the guide rail, the stroke valve is connected to the oil circuit in the left position, and the high-pressure oil flows from port P to port A and then passes through the balancing valve into the rodless chamber of the locking cylinder. The locking cylinder pushes the locking pin, and the locking pin is inserted into the limit device to achieve locking.

[0024] In another aspect, the present invention provides a method for unlocking an automatic locking device of an arm support, comprising:

[0025] When the unfolding angle of the first folding arm is greater than α, the detection rod leaves the guide rail, the travel valve is connected to the oil circuit in the right position, and the high-pressure oil flows from port P to port B and then passes through the balancing valve into the rod chamber of the locking cylinder. The locking cylinder retracts the locking pin, and the locking pin is pulled out from the inside of the limit device to release the lock.

[0026] On the other hand, the present invention provides a fire truck, which adopts the above-mentioned automatic locking device for the arm.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention detects the unfolding angle of the first folding arm through a detection mechanism. When the detection mechanism detects that the unfolding angle of the first folding arm is less than α, that is, the second folding arm is in the heavy-load non-working area, the hydraulic control system automatically controls the locking mechanism to lock the first folding arm and the second folding arm. When the second folding arm enters the light-load working area from the heavy-load non-working area, the hydraulic control system automatically controls the locking mechanism to unlock the first folding arm and the second folding arm. The locking mechanism provided by the present invention can support the suspended second folding arm, offset the effect of the gravity torque, and avoid the excessive diameter of the expansion and contraction cylinder affecting the vehicle's driving performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the arm structure of a fire truck provided by an embodiment of the present invention;

[0030] Figure 2 1 is a schematic diagram of the deployment of the arm of a fire truck provided by an embodiment of the present invention;

[0031] Figure 3 1 is a schematic diagram of the deployment of the arm of a fire truck provided by an embodiment of the present invention;

[0032] Figure 4 is a structural schematic diagram of an automatic locking device provided by an embodiment of the present invention;

[0033] Figure 5 is a schematic structural diagram of a detection mechanism provided by an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of a hydraulic control system provided by an embodiment of the present invention;

[0035] Figure 7 is a structural schematic diagram of a locking mechanism provided by an embodiment of the present invention;

[0036] In the figure: 1: first folding arm; 2: second folding arm; 3: extension and retraction cylinder; 4: detection mechanism; 41: detection rod; 42: guide rail; 5: hydraulic control system; 51: stroke valve; 52: balancing valve; 53: locking cylinder; 6: locking mechanism; 61: limit device; 62: locking pin. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] Example 1:

[0041] like Figure 1-7As shown, this embodiment provides an arm locking device, including a folding arm and a locking device, wherein the folding arm includes a first folding arm 1 and a second folding arm 2, wherein one end of the first folding arm 1 is mounted on a turntable, and the other end is hinged to the second folding arm 2.

[0042] In this embodiment, the locking device includes a detection mechanism 4 , a hydraulic control system 5 and a locking mechanism 6 . The detection mechanism 4 is used to detect the unfolding angle of the first folding arm 1 .

[0043] Specifically, the detection mechanism 4 includes a detection rod 41 and a guide rail 42. The detection rod 41 is installed on the first folding arm 1, and the guide rail 42 is installed on the turntable. In the initial state, that is, when the folding arm frame is not lifted, the detection rod 41 abuts against the guide rail 42.

[0044] When the folding arm frame starts to lift, the first folding arm 1 rotates around the turntable, and the detection rod 41 installed on the first folding arm 1 moves accordingly. When the unfolding angle of the first folding arm 1 is less than α, the detection rod 41 presses the guide rail 42 and slides on the guide rail 42;

[0045] When the unfolding angle of the first folding arm 1 is greater than α, the detection rod 41 leaves the guide rail 42. At this time, the detection mechanism 4 detects that the unfolding angle of the first folding arm 1 is greater than α.

[0046] In this embodiment, the hydraulic control system 5 is used to control the locking mechanism 6 to lock / unlock according to the unfolding angle of the first folding arm 1 detected by the detection mechanism 4 .

[0047] Specifically, the hydraulic control system 5 includes a stroke valve 51, a balancing valve 52, a locking cylinder 53 and a pipeline. The stroke valve 51 is connected to the balancing valve 52 through a pipeline, and the balancing valve 52 is connected to the locking cylinder 53 through a pipeline. The stroke valve 51 has P, A, B, and T ports, and the locking cylinder 53 has a rod chamber and a rodless chamber.

[0048] In this embodiment, the locking mechanism 6 is used to lock / unlock the first folding arm 1 and the second folding arm 2 .

[0049] Specifically, the locking mechanism 6 includes a limiting device 61 and a locking pin 62 . The limiting device 61 is installed on the second folding arm 2 , and the locking pin 62 is installed on the first folding arm 1 .

[0050] When the locking pin 62 is inserted into the limiting device 61 , the first folding arm 1 and the second folding arm 2 are locked; when the locking pin 62 leaves the limiting device 61 , the first folding arm 1 and the second folding arm 2 are unlocked.

[0051] Example 2:

[0052] The difference between this embodiment and the first embodiment is that:

[0053] In this embodiment, the detection mechanism 4 includes a detection rod 41 and a guide rail 42. The detection rod 41 is installed on the turntable, and the guide rail 42 is installed on the first folding arm 1. When the unfolding angle of the first folding arm 1 is less than α, the detection rod 41 abuts against the guide rail 42.

[0054] Specifically, when the folding arm frame starts to lift, the first folding arm 1 rotates around the turntable, and the guide rail 42 installed on the first folding arm 1 moves accordingly. When the unfolding angle of the first folding arm 1 is less than α, the detection rod 41 is slidably connected to the guide rail 42. When the unfolding angle of the first folding arm 1 is greater than α, the guide rail 42 leaves the detection rod 41. At this time, the detection mechanism 4 detects that the unfolding angle of the first folding arm is greater than α.

[0055] Example 3:

[0056] This embodiment provides a locking method, including:

[0057] When the unfolding angle of the first folding arm 1 is less than α, the detection rod 41 installed on the first folding arm 1 presses the guide rail 42 installed on the turntable or the guide rail 42 installed on the first folding arm 1 is slidably connected to the detection rod 41 installed on the turntable. At this time, it means that the second folding arm 2 is in the heavy-load non-working area, and the hydraulic control system 5 needs to control the locking mechanism 6 to lock the first folding arm 1 and the second folding arm 2.

[0058] Specifically, when the unfolding angle of the first folding arm 1 is less than α, the stroke valve 51 of the hydraulic control system 5 is connected to the oil circuit in the left position, and the high-pressure oil flows from the P port to the A port and then passes through the balancing valve 52 into the rodless chamber of the locking cylinder 53. At this time, the locking cylinder 53 of the hydraulic control system 5 pushes the locking pin 62 of the locking mechanism 6, and the locking pin 62 installed on the first folding arm 1 is inserted into the limit device 61 installed on the second folding arm 2 to achieve locking.

[0059] Example 4:

[0060] This embodiment provides an unlocking method, including:

[0061] When the unfolding angle of the first folding arm 1 is greater than α, the detection rod 41 installed on the first folding arm 1 leaves the guide rail 42 installed on the turntable, or the guide rail 42 installed on the first folding arm 1 leaves the detection rod 41 installed on the turntable. This means that the second folding arm 2 enters the light load working area from the heavy load non-working area, and the hydraulic control system 5 needs to control the locking mechanism 6 to unlock the first folding arm 1 and the second folding arm 2.

[0062] Specifically, when the unfolding angle of the first folding arm 1 is greater than α, the stroke valve 51 of the hydraulic control system 5 is connected to the oil circuit in the right position, and the high-pressure oil flows from the P port to the B port and then passes through the balancing valve 52 into the rod chamber of the locking cylinder 53. At this time, the locking cylinder 53 of the hydraulic control system 5 controls the locking pin 62 to retract, and the locking pin 62 installed on the first folding arm 1 is pulled out from the inside of the limit device 61 installed on the second folding arm 2 to release the lock.

[0063] Embodiment 5:

[0064] This embodiment provides a fire truck that adopts the automatic arm locking device described in Example 1 or Example 2.

[0065] This embodiment can support the suspended second folding arm 2 when the second folding arm 2 is in the heavy-load non-working area, offset the effect of gravity torque, and avoid the excessive diameter of the extension and retraction cylinder affecting the vehicle's driving performance.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An arm locking device, characterized in that: It comprises a folding arm frame and a locking device, wherein the folding arm frame comprises a first folding arm (1) and a second folding arm (2), one end of the first folding arm (1) is mounted on a turntable, and the other end is hinged to the second folding arm (2); The locking device comprises a detection mechanism (4), a hydraulic control system (5) and a locking mechanism (6), wherein the detection mechanism (4) is used to detect the unfolding angle of the first folding arm (1), the hydraulic control system (5) is used to control the locking mechanism (6) to lock or unlock according to the unfolding angle of the first folding arm (1) detected by the detection mechanism (4), and the locking mechanism (6) is used to lock or unlock the first folding arm (1) and the second folding arm (2); When the first folding arm (1) is unfolded at an angle less than α, the detection rod (41) presses the guide rail (42), the travel valve (51) is connected to the oil circuit in the left position, and the high-pressure oil flows from the P port to the A port and then passes through the balance valve (52) into the rodless chamber of the locking cylinder (53), the locking cylinder (53) pushes the locking pin (62), and the locking pin (62) is inserted into the interior of the limit device (61), thereby achieving locking; When the first folding arm (1) is unfolded at an angle greater than α, the detection rod (41) leaves the guide rail (42), the travel valve (51) is connected to the oil circuit in the right position, and the high-pressure oil flows from the P port to the B port and then passes through the balance valve (52) into the rod chamber of the locking cylinder (53). The locking cylinder (53) retracts the locking pin (62), and the locking pin (62) is pulled out from the inside of the limit device (61), thereby releasing the lock.

2. The arm locking device according to claim 1, characterized in that: The detection mechanism (4) comprises a detection rod (41) and a guide rail (42); the detection rod (41) is mounted on the first folding arm (1); and the guide rail (42) is mounted on the turntable; when the first folding arm (1) is unfolded at an angle less than α, the detection rod (41) abuts against the guide rail (42).

3. The arm locking device according to claim 1, characterized in that: The detection mechanism (4) comprises a detection rod (41) and a guide rail (42); the detection rod (41) is mounted on a turntable; the guide rail (42) is mounted on a first folding arm (1); when the first folding arm (1) is unfolded at an angle less than α, the detection rod (41) abuts against the guide rail (42).

4. The arm locking device according to claim 1, characterized in that: The hydraulic control system (5) comprises a stroke valve (51), a balancing valve (52), a locking oil cylinder (53) and a pipeline. The stroke valve (51) is connected to the balancing valve (52) via a pipeline, and the balancing valve (52) is connected to the locking oil cylinder (53) via a pipeline. The stroke valve (51) has P, A, B, and T ports, and the locking oil cylinder (53) has a rod chamber and a rodless chamber.

5. The arm locking device according to claim 1, characterized in that: The locking mechanism (6) comprises a limiting device (61) and a locking pin (62), wherein the limiting device (61) is mounted on the second folding arm (2), and the locking pin (62) is mounted on the first folding arm (1).

6. A fire truck, characterized in that: The invention comprises the arm locking device according to any one of claims 1 to 5.

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