Boom device and fire truck

Abstract

The present application relates to the technical field of firefighting, and provides a boom device and a fire truck. The boom device comprises a main boom, a first driving mechanism, an offset boom and a second driving mechanism, wherein the main boom is a telescopic boom; the first driving mechanism is adapted to drive the pitch motion of the main boom; the offset boom comprises at least three boom sections; the first boom section of the offset boom is rotatably connected to the last boom section of the main boom, and the first boom section of the offset boom is a telescopic boom or a folding boom; the second driving mechanism is adapted to drive the offset boom to switch between a folded state and an unfolded state; and in the folded state, the offset boom is located on the side of the main boom, and the offset boom is stacked in at least three layers. In this way, the offset boom is wholly or partially configured in the structural form of a folding boom, so that a variable cross-section design of the offset boom is achieved, and the boom sections of the folding boom portion of the offset boom do not overlap in the unfolded state, which is beneficial to the lightweight design of the offset boom, reduces lateral bending of the main boom, and facilitates the stable operation of the fire truck.

Description

boom assembly and fire truck

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application No. 202421434568.X, filed on June 21, 2024, entitled “Boom Device and Fire Truck”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of fire protection technology, and in particular to a boom device and a fire truck. Background Technology

[0004] In various high-altitude operations and fire rescue operations, work machinery with foldable and extendable booms is used. Taking fire trucks as an example, the boom is one of the key components determining the overall operational performance of a fire truck. To ensure the rescue height of a fire truck, the extended length of its boom needs to be ensured. Therefore, fire truck booms are gradually developing towards ultra-long booms.

[0005] In related technologies, ultra-long boom devices are configured as a main boom plus offset boom structure. The main boom is a telescopic boom, and some offset booms are entirely designed as telescopic booms. Because telescopic booms have certain requirements on the overlap length of each boom section in the deployed state, and the cross-sectional dimensions of each boom section change relatively little, lightweight design is not feasible, resulting in a relatively large weight for the offset booms. After the ultra-long boom device is deployed, the main boom exhibits severe lateral bending, which is detrimental to stable operation.

[0006] Therefore, the problem of severe lateral bending of the main boom after deployment in ultra-long boom devices in related technologies urgently needs to be solved.

[0007] Summary of the Invention

[0008] This application provides a boom device and a fire truck to solve the above-mentioned technical problems.

[0009] This application provides a boom device, including:

[0010] Main arm, wherein the main arm is a telescopic arm;

[0011] The first drive mechanism is adapted to drive the pitching motion of the main arm;

[0012] An offset arm, comprising at least three arm sections, wherein the first arm section of the offset arm is rotatably connected to the last arm section of the main arm, and the first arm section of the offset arm is a telescopic arm or a folding arm.

[0013] The second drive mechanism is adapted to drive the bias arm to switch between a folded state and an unfolded state.

[0014] In the folded state, the bias arm is located to the side of the main arm, and the bias arms are stacked in at least three layers.

[0015] According to the boom device provided in this application, along the distribution direction of the offset boom and the main boom, the projection area of ​​the offset boom is located inside the projection area of ​​the main boom or the projection area of ​​the offset boom coincides with the projection area of ​​the main boom.

[0016] According to a boom device provided in this application, the offset boom includes:

[0017] The first arm segment, the second arm segment, and the third arm segment are arranged sequentially, and adjacent pairs are rotatably connected.

[0018] The second drive mechanism includes:

[0019] The second drive unit is connected to the first arm segment and the end arm segment of the main arm, respectively;

[0020] The third drive unit is connected to the head ends of the first arm section and the second arm section respectively;

[0021] The fourth drive unit is connected to the head end of the second arm section and the third arm section respectively.

[0022] According to the boom device provided in this application, in the folded state, the third boom section is located between the first boom section and the second boom section;

[0023] Alternatively, when the bias arm is folded, the third arm segment is located on the side of the second arm segment away from the first arm segment.

[0024] According to the boom device provided in this application, it further includes:

[0025] The end cap has a first end connected to the end of the end segment of the main arm, and a second end extending along the distribution direction of the offset arm and the main arm.

[0026] The first end segment of the bias arm is connected to the lower edge of the second end of the end head. In the folded state, the second end segment of the bias arm is located above the first end segment; or, the first end segment of the bias arm is connected to the upper edge of the second end of the end head. In the folded state, the second end segment of the bias arm is located below the first end segment.

[0027] According to a boom device provided in this application, the second boom section includes a front end connecting part, a rear end connecting part, and a transition part disposed between the front end connecting part and the rear end connecting part, wherein the front end connecting part, the transition part, and the rear end connecting part are formed into an integral structure;

[0028] The axis of the head end connector and the axis of the tail end connector are both parallel to the axis of the main arm. The distance between the axis of the head end connector and the axis of the main arm is a first distance, and the distance between the axis of the tail end connector and the axis of the main arm is a second distance. The first distance is greater than the second distance.

[0029] According to the boom device provided in this application, the length of the end section of the offset boom can be telescopically adjusted.

[0030] According to a boom device provided in this application, the end section of the offset boom includes:

[0031] The first and second sections are connected by a rotation;

[0032] A fifth driving member is connected to the first segment and the second segment respectively, and the fifth driving member is adapted to drive the second segment to rotate relative to the first segment.

[0033] According to the boom device provided in this application, the length of the second section is telescopically adjustable.

[0034] This application also provides a fire truck including the aforementioned boom assembly.

[0035] The boom device provided in this application includes a main boom, a first drive mechanism, an offset boom, and a second drive mechanism. The main boom is a telescopic boom, and the first drive mechanism is used to drive the pitching motion of the main boom. The offset boom includes at least three boom sections, and the leading boom section of the offset boom is rotatably connected to the trailing boom section of the main boom. The leading boom section of the offset boom is either a telescopic boom or a folding boom. The second drive mechanism is used to drive the offset boom to switch between a folded state and an extended state. In the folded state, the offset boom is located to the side of the main boom, and the offset booms are stacked in at least three layers. This configuration, by setting the offset boom entirely or partially as a folding boom structure, achieves a variable cross-section design for the offset boom. Furthermore, there are no requirements on the overlap length of the boom sections in the extended state, and there is virtually no overlap, which is beneficial for the lightweight design of the offset boom, reduces the lateral bending of the main boom, and facilitates the stable operation of the fire truck.

[0036] Furthermore, the fire truck provided in this application also possesses the various advantages described above due to the boom device described above. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 is a structural schematic diagram of the boom device provided in this application in the deployed state;

[0039] Figure 2 is a structural schematic diagram of the first type of boom device provided in this application in the folded state;

[0040] Figure 3 is a structural schematic diagram of the second type of boom device provided in this application in the folded state;

[0041] Figure 4 is a structural schematic diagram of the third type of boom device provided in this application in the folded state;

[0042] Figure 5 is a structural schematic diagram of the fourth type of boom device provided in this application in the folded state;

[0043] Figure 6 is a structural schematic diagram of the fifth type of boom device provided in this application in the folded state;

[0044] Figure 7 is a structural schematic diagram of the sixth type of boom device provided in this application in the folded state;

[0045] Figure 8 is a top view of the boom device provided in this application in the folded state;

[0046] Figure 9 is a schematic diagram of the structure of the first type of end arm segment of the bias arm provided in this application;

[0047] Figure 10 is a schematic diagram of the structure of the second type of end arm segment of the bias arm provided in this application;

[0048] Figure 11 is a structural schematic diagram of the third type of end arm segment of the bias arm provided in this application;

[0049] Figure 12 is a structural schematic diagram of the fourth type of end arm segment of the bias arm provided in this application; and

[0050] Figure 13 is a structural schematic diagram of the boom device provided in this application in the deployed state (wherein, the third boom section is a segmented structure).

[0051] Figure label:

[0052] 1. Main boom; 2. First drive mechanism; 3. First boom section; 4. Second boom section; 5. Third boom section; 6. End; 7. First segment; 8. Second segment; 9. Fifth drive component; 10. End segment of offset boom; 11. Vehicle body; 12. Water supply pipeline; 13. Head end connection; 14. Transition section; 15. Tail end connection; x, first distance; y, second distance. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] The boom assembly of this application is described below with reference to Figures 1 to 13.

[0055] As shown in Figures 1 to 13, the boom device provided in the embodiments of this application includes a main boom 1, a first drive mechanism 2, an offset boom, and a second drive mechanism.

[0056] Specifically, the main boom 1 is a telescopic boom, and the first drive mechanism 2 is used to drive the pitching motion of the main boom 1. The main boom 1 is generally mounted on a slewing platform, specifically allowing the leading end of the main boom 1 to be rotatably connected to the slewing platform. The first drive mechanism 2 can be, but is not limited to, a hydraulic cylinder.

[0057] The main boom 1 can be, but is not limited to, a six-stage telescopic boom. For ultra-long booms, a six-stage telescopic boom is preferred.

[0058] In practice, the main boom 1 is mounted on the vehicle body 11 via a slewing platform. Specifically, it can be mounted at the rear, middle, or front of the vehicle body 11. Referring to Figure 1, the main boom 1 is mounted at the rear of the vehicle body 11. When the boom is folded, the main boom 1 extends towards the front of the vehicle body 11, allowing it to rest on the top of the cab of the vehicle body 11. This increases the length of a single boom segment and ensures sufficient extension length even when the number of boom segments is small.

[0059] The offset arm is a folding arm, comprising at least three arm sections. The first arm section of the offset arm is rotatably connected to the last arm section of the main arm 1. The first arm section of the offset arm can be a telescopic arm or a folding arm. The second drive mechanism is used to drive the offset arm to switch between a folded state and an unfolded state.

[0060] In the folded state, the offset arm is located to the side of the main arm 1, and the offset arms are stacked in at least three layers.

[0061] This configuration, by setting the offset boom as a whole or part of a folding boom structure, achieves a variable cross-section design for the offset boom. Furthermore, there are no requirements for the overlap length of each section of the folding boom in the unfolded state, and there is basically no overlap. This is beneficial for the lightweight design of the offset boom, reduces the lateral bending of the main boom 1, and is conducive to the stable operation of the fire truck.

[0062] Furthermore, by configuring the main boom 1 as a telescopic boom structure, the extended main boom 1 can provide a greater height for the offset boom. The offset boom is partially configured as a folding boom structure, giving the boom assembly a larger span. The boom assembly in this embodiment has a strong ability to cross obstacles.

[0063] It should be noted that the rotation axis of the main boom 1 relative to the slewing platform, the rotation axis of the offset boom relative to the main boom 1, and the rotation axes of the offset boom sections relative to each other are parallel to each other and all parallel to the bearing surface of the vehicle body 11. Under normal circumstances, when the vehicle body 11 is located on a horizontal plane, the bearing surface of the vehicle body 11 is set in the horizontal direction.

[0064] In this embodiment, along the distribution direction of the offset arm and the main arm 1, the projection area of ​​the offset arm is located inside the projection area of ​​the main arm 1 or overlaps with the main arm 1. The setting of the offset arm does not affect the height of the boom device in the folded state, which is beneficial for realizing an ultra-long boom structure.

[0065] In this embodiment, the height of the upper edge of the offset arm is less than the height of the upper edge of the main boom 1, while the height of the lower edge of the offset arm is greater than the height of the lower edge of the main boom 1. That is, the offset arm does not affect the overall height of the boom assembly, nor does it occupy the space below the horizontal plane where the lower edge of the main boom 1 is located. Specifically, when the boom assembly is in a folded state, each section of the offset arm extends substantially horizontally.

[0066] There is ample space above the vehicle body 11 and below the main boom 1 and the offset boom, which can be used to install water tanks and ensure that the water tanks have sufficient capacity. When applied to high-pressure water jet fire trucks, this can greatly improve the fire extinguishing efficiency and fire extinguishing capability of the high-pressure water jet fire trucks.

[0067] In this embodiment, the offset arm includes three segments: a first segment 3, a second segment 4, and a third segment 5. These segments are arranged sequentially, with adjacent segments rotatably connected. The folding and unfolding of the offset arm can be achieved by rotating the first segment 3 relative to the main arm 1 and by rotating adjacent segments of the three segments.

[0068] When the offset arm is folded, it is stacked in three layers, which can meet the requirements of a full extension length of 30 to 40 meters for the offset arm and the requirement that the overall vehicle height is less than 4 meters.

[0069] The second drive mechanism includes a second drive component, a third drive component, and a fourth drive component.

[0070] The second drive unit is connected to the first arm section 3 and the end arm section of the main arm 1. The second drive unit can drive the first arm section 3 to rotate relative to the end arm section of the main arm 1.

[0071] The third drive unit is connected to the head end of the first arm section 3 and the second arm section 4. The second arm section 4 can be driven to rotate relative to the first arm section 3 by the third drive unit.

[0072] The fourth drive unit is connected to the head end of the second arm section 4 and the third arm section 5. The third arm section 5 can be driven to rotate relative to the second arm section 4 by the fourth drive unit.

[0073] The second, third, and fourth drive components mentioned above may be, but are not limited to, hydraulic cylinders or rotary motors.

[0074] To minimize the height of the offset arm in its folded state, it is necessary to maximize the range of relative rotation angles between adjacent arm sections. This ensures that when the offset arm is folded, adjacent arm sections are parallel to each other, and the arm sections of the offset arm are parallel to the axis of the main arm 1. The following explanation uses the second drive unit as an example.

[0075] When a telescopic hydraulic cylinder is selected as the second driving component, the cylinder barrel of the telescopic hydraulic cylinder is located in the first boom section 3, and the piston rod of the telescopic hydraulic cylinder is connected to the end section of the main boom 1 via a connecting rod assembly. The connecting rod assembly can increase the rotation angle range of the first boom section 3 under the driving action of the second driving component, which helps to reduce the stroke requirement of the second driving component. The second driving component can drive the first boom section 3 to rotate within a 180-degree range relative to the main boom 1.

[0076] It should be noted that the cylinder and piston rod of the telescopic hydraulic cylinder are two parts that can slide relative to each other. It is sufficient to connect one to the first boom section 3 and the other to the end boom section of the main boom 1; no specific limitation is made here. Furthermore, whether the connecting rod assembly is located in the cylinder or the piston rod of the telescopic hydraulic cylinder is not specifically limited.

[0077] When a rotary motor is selected as the second drive component, it can be positioned at the rotational connection point between the first boom section 3 and the end boom section of the main boom 1. The rotary motor can drive the first boom section 3 to rotate over a wide range relative to the end boom section of the main boom 1.

[0078] In some embodiments, when the bias arm is in the folded state, the third arm segment 5 is located between the first arm segment 3 and the second arm segment 4, as shown in Figures 2 and 3. When switching the bias arm to the folded state, it is necessary to first control the rotation of the third arm segment 5 relative to the second arm segment 4, and then control the rotation of the second arm segment 4 relative to the first arm segment 3. When switching the bias arm to the unfolded state, it is necessary to first control the rotation of the second arm segment 4 relative to the first arm segment 3, and then control the rotation of the third arm segment 5 equivalent to that of the second arm segment 4.

[0079] In other embodiments, when the bias arm is in the folded state, the third arm segment 5 is located on the side of the second arm segment 4 away from the first arm segment 3, as shown in Figures 4 to 7. The order in which the third arm segment 5 rotates relative to the second arm segment 4 and the second arm segment 4 rotates relative to the first arm segment 3 is not restricted when the bias arm switches to the folded state and to the unfolded state.

[0080] In some embodiments, when the bias arm is in the extended state, the second, third, and fourth drive members, as well as each linkage assembly, are located below the bias arm. With this configuration, the second, third, and fourth drive members are under pressure when the bias arm is in the extended state. When telescopic hydraulic cylinders are used for the second, third, and fourth drive members, the rodless chamber of the telescopic hydraulic cylinder bears the pressure, resulting in better force distribution and improved stability of the boom assembly.

[0081] In other embodiments, the second, third, and fourth drive members, as well as each link assembly, may be positioned above the bias arm when it is in the extended state.

[0082] In this embodiment of the application, the boom device further includes an end head 6. The first end of the end head 6 is connected to the end of the end segment of the main boom 1. The second end of the end head 6 extends along the distribution direction of the offset arm and the main boom 1. Specifically, the extension direction of the end head 6 is perpendicular to the axis of the main boom 1.

[0083] In some embodiments, the first end segment of the offset arm is connected to the lower edge of the second end of the end 6. Referring to Figures 2, 4, and 6, in the folded state, the second end segment 4 is located above the first end segment 3. With this configuration, during the deployment of the boom assembly, the offset arm is located in front of the main boom 1, the overall center of gravity of the boom assembly is relatively forward, and the stability of the vehicle body 11 is stronger.

[0084] In other embodiments, the first segment of the offset arm is connected to the upper edge of the second end of the end 6. Referring to Figures 3, 5, and 7, in the folded state, the second segment 4 is located below the first segment 3. With this configuration, during the deployment of the boom assembly, the main boom 1 can be controlled to move first, or the offset arm can be controlled to deploy first, making the control of the boom assembly more flexible.

[0085] In this embodiment, the second arm segment 4 includes a head end connecting portion 13, a tail end connecting portion 15, and a transition portion 14 disposed between the head end connecting portion 13 and the tail end connecting portion 15. The head end connecting portion 13, the transition portion 14, and the tail end connecting portion 15 are formed into an integral structure.

[0086] The axis of the head end connecting part 13 and the axis of the tail end connecting part 15 are both parallel to the axis of the main arm 1. The distance between the axis of the head end connecting part 13 and the axis of the main arm 1 is the first distance x, and the distance between the axis of the tail end connecting part 15 and the axis of the main arm 1 is the second distance y. The first distance x is greater than the second distance y, as shown in Figure 8.

[0087] Understandably, the axis of the transition section 14 forms an angle with the axis of the main arm 1, and the axis of the transition section 14 is inclined relative to the axis of the main arm 1. Along the direction from the beginning to the end of the main arm 1, the distance between the axis of the transition section 14 and the axis of the main arm 1 gradually decreases, and the second arm segment 4 gradually approaches the main arm 1.

[0088] This configuration, with space reserved on the side of the second boom 4 furthest from the main boom 1, allows for the installation of the water supply pipe 12, which helps reduce the overall width of the boom assembly. Furthermore, it facilitates the use of rigid pipe connections for the water supply pipe 12, reducing pressure loss.

[0089] The overall width of the boom assembly is the dimension of the boom assembly along the horizontal direction perpendicular to the axis of the main boom 1.

[0090] In some embodiments of this application, the length of the end section 10 of the offset boom is telescopically adjustable, as shown in FIG10. By telescopically adjusting the end section 10 of the offset boom, the flexibility of the boom assembly can be improved. Installing a fire monitor at the end of the end section 10 of the offset boom can increase the fire extinguishing range.

[0091] In other embodiments of this application, the end segment 10 of the bias arm is configured as a segmented structure, including a first segment 7, a second segment 8, and a fifth driving member 9. The first segment 7 and the second segment 8 are arranged sequentially along the direction from the beginning to the end of the bias arm, and the second segment 8 is rotatably connected to the first segment 7, as shown in Figures 11 and 12. The fifth driving member 9 is connected to the first segment 7 and the second segment 8, and the fifth driving member 9 is used to drive the second segment 8 to rotate relative to the first segment 7.

[0092] The flexibility of the boom assembly can also be improved by rotating the second section 8 relative to the first section 7. Installing a fire monitor on the second section 8 can increase the fire suppression range.

[0093] Similar to the second driving component mentioned above, the fifth driving component 9 may be, but is not limited to, a telescopic hydraulic cylinder, a rotary motor, etc.

[0094] In a further embodiment, the second segment 8 can be configured as a structure with an adjustable length, as shown in Figure 12, which can further improve the flexibility of the boom device and the fire extinguishing range.

[0095] It should be noted that the boom device in this embodiment is not limited to fire trucks, but can also be applied to cranes, aerial work platforms, etc.

[0096] On the other hand, this application also provides a fire truck, including the boom device provided in any of the above embodiments. The boom device provided in any of the above embodiments is advantageous for achieving lightweight design, and the lateral bending of the main boom 1 is small. Therefore, the fire truck in this embodiment has strong stability. The derivation process of the beneficial effects of the fire truck in this application embodiment is largely similar to the derivation process of the beneficial effects of the boom device described above, so it will not be repeated here.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A boom assembly, comprising: Main arm, wherein the main arm is a telescopic arm; The first drive mechanism is adapted to drive the pitching motion of the main arm; An offset arm, comprising at least three arm sections, wherein the first arm section of the offset arm is rotatably connected to the last arm section of the main arm, and the first arm section of the offset arm is a telescopic arm or a folding arm. The second drive mechanism is adapted to drive the bias arm to switch between a folded state and an unfolded state. In the folded state, the bias arm is located to the side of the main arm, and the bias arms are stacked in at least three layers.

2. The boom assembly according to claim 1, wherein, Along the distribution direction of the bias arm and the main arm, the projection area of ​​the bias arm is located inside the projection area of ​​the main arm or the projection area of ​​the bias arm coincides with the projection area of ​​the main arm.

3. The boom assembly according to claim 1, wherein, The bias arm includes: The first arm segment, the second arm segment, and the third arm segment are arranged sequentially, and adjacent pairs are rotatably connected. The second drive mechanism includes: The second drive unit is connected to the first arm segment and the end arm segment of the main arm, respectively; The third drive unit is connected to the head ends of the first arm section and the second arm section respectively; The fourth drive unit is connected to the head end of the second arm section and the third arm section respectively.

4. The boom assembly according to claim 3, wherein, When the bias arm is folded, the third arm segment is located between the first arm segment and the second arm segment; Alternatively, when the bias arm is folded, the third arm segment is located on the side of the second arm segment away from the first arm segment.

5. The boom assembly according to claim 3, further comprising: The end cap has a first end connected to the end of the end segment of the main arm, and a second end extending along the distribution direction of the offset arm and the main arm. The first segment of the bias arm is connected to the lower edge of the second end of the end cap. In the folded state, the second segment of the bias arm is positioned above the first segment; or... The first end segment of the bias arm is connected to the upper edge of the second end of the end, and in the folded state, the second end segment is located below the first end segment.

6. The boom assembly according to claim 3, wherein, The second arm segment includes a head end connecting portion, a tail end connecting portion, and a transition portion disposed between the head end connecting portion and the tail end connecting portion, wherein the head end connecting portion, the transition portion, and the tail end connecting portion are formed as an integral structure; The axis of the head end connector and the axis of the tail end connector are both parallel to the axis of the main arm. The distance between the axis of the head end connector and the axis of the main arm is a first distance, and the distance between the axis of the tail end connector and the axis of the main arm is a second distance. The first distance is greater than the second distance.

7. The boom assembly according to claim 1, wherein, The length of the end segment of the bias arm can be adjusted by telescoping.

8. The boom assembly according to claim 1, wherein, The end arm segment of the bias arm includes: The first and second sections are connected by a rotation; A fifth driving member is connected to the first segment and the second segment respectively, and the fifth driving member is adapted to drive the second segment to rotate relative to the first segment.

9. The boom assembly according to claim 8, wherein, The length of the second segment can be adjusted.

10. A fire truck comprising a boom assembly as described in any one of claims 1 to 9.

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