A sand throwing fire fighting vehicle

Abstract

The application discloses a sand throwing fire extinguishing vehicle, which comprises a chassis and a sand throwing device, wherein the sand throwing device is arranged on the chassis, the sand throwing device comprises a sand throwing machine for throwing sand, the sand throwing device further comprises a sand conveying machine, the sand conveying machine is provided with a sand outlet pipe, a sand outlet of the sand outlet pipe is detachably connected with a sand inlet of the sand throwing machine, the sand throwing fire extinguishing vehicle further comprises a power device, the power device is arranged on the chassis and connected with the sand throwing machine, the sand conveying machine and the chassis respectively, and is used for providing power for the sand throwing machine, the sand conveying machine and the chassis. The sand conveying machine can take sand from any available sand source, and is no longer limited to vehicle-mounted storage, which means that the device can be more flexibly deployed at any place with external sand source, the flexibility and maneuverability of fire extinguishing operation are improved, and the fire extinguishing response time is shortened. The chassis does not need to carry a large amount of sand to travel, the load of the chassis is reduced, fuel is saved, and the operation cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of emergency rescue technology, and in particular to a sand-throwing method for extinguishing fires. Background Technology

[0002] Currently, in special fire situations where traditional extinguishing agents such as water, foam, or carbon dioxide are unsuitable, the firefighting field has widely adopted large sand-throwing fire trucks as a response strategy. These innovative vehicles directly intervene in the fire source by efficiently throwing sand, which not only greatly enhances firefighting efficiency but also significantly reduces the direct risks faced by firefighters in high-risk environments, building a solid line of defense to protect people's lives and property and maintain social stability.

[0003] Chinese patent application publication number CN109806528A discloses an independently powered sand-throwing fire extinguishing device, including a sand box assembly and a throwing system; the sand box assembly includes a cargo box for storing sand, a feeding bottom plate set at the bottom of the cargo box for conveying sand to a feeding auger, and a feeding auger for auging sand into the throwing system; the throwing system includes a rotatable throwing impeller for throwing sand outward.

[0004] The aforementioned patent has the following technical problem: although this large cargo box can store a lot of sand, it also occupies a large storage space, resulting in the entire sand-throwing fire extinguishing device becoming very large. Summary of the Invention

[0005] Therefore, there is a need to provide a sand-throwing fire extinguisher to solve the problem that although the cargo box of the existing sand-throwing fire extinguishing device can store a lot of sand, it also occupies a lot of storage space, resulting in the large size of the entire sand-throwing fire extinguisher.

[0006] To achieve the above objectives, this embodiment provides a sand-throwing fire extinguisher, including a chassis and a sand-throwing device. The sand-throwing device is mounted on the chassis and includes a sand-throwing machine for throwing sand particles. The sand-throwing device also includes a sand conveyor with a sand outlet pipe. The sand outlet of the sand outlet pipe is detachably connected to the sand inlet of the sand-throwing machine. The sand-throwing fire extinguisher also includes a power unit mounted on the chassis and connected to the sand-throwing machine, the sand conveyor, and the chassis, respectively, for providing power to the sand-throwing machine, the sand conveyor, and the chassis.

[0007] Furthermore, the power unit includes an engine, a hydraulic system, and a generator. The engine is connected to the hydraulic system, which includes a hydraulic pump, a hydraulic circuit, a first hydraulic motor, and a second hydraulic motor. The engine is connected to the hydraulic pump, which is connected to the first hydraulic motor and the second hydraulic motor via the hydraulic circuit. The first hydraulic motor is connected to the impeller shaft of the sand-throwing machine, and the second hydraulic motor is connected to the generator. The generator is connected to the electrically driven sand-carrying motor of the sand-carrying machine.

[0008] Furthermore, the sand conveying machine includes a fixed base, a sand inlet pipe, a sand conveying motor, a first spiral blade, and a second spiral blade. The fixed base has a cavity, and the inlet and outlet of the cavity are respectively connected to the sand outlet pipe and the sand inlet pipe. The first spiral blade and the second spiral blade are respectively mounted in the cavity through bearing seats. The first spiral blade extends into the sand inlet pipe, and the second spiral blade extends into the sand outlet pipe. The sand conveying motor is mounted on the fixed base and is used to drive the first spiral blade and the second spiral blade to rotate.

[0009] Furthermore, it also includes a first sand conveying pipe and a second sand conveying pipe. The sand outlet of the sand throwing machine is connected to the sand inlet of the first sand conveying pipe. The first sand conveying pipe is located below the second sand conveying pipe. The sand outlet of the first sand conveying pipe extends into the sand inlet of the second sand conveying pipe. The outer diameter of the sand outlet of the first sand conveying pipe is smaller than the inner diameter of the sand inlet of the second sand conveying pipe, so that a channel for gas flow is formed between the outer wall of the sand outlet of the first sand conveying pipe and the inner wall of the sand inlet of the second sand conveying pipe.

[0010] Furthermore, the outer wall of the sand outlet of the first sand conveying pipe is spaced 10-20mm from the inner wall of the sand inlet of the second sand conveying pipe.

[0011] Furthermore, the first sand conveying pipe extends 20-60mm into the sand inlet of the second sand conveying pipe.

[0012] Furthermore, the second sand conveying pipe is foldable, and the sand-throwing fire truck also includes a foldable sand-throwing arm, which is mounted on the sand-throwing machine or the chassis. The sand-throwing arm is connected to the second sand conveying pipe and is used to adjust the height of the sand outlet of the second sand conveying pipe.

[0013] Furthermore, the foldable sand-throwing arm includes a base, a primary arm, and a secondary arm. The base is mounted on the sand-throwing machine or the chassis. The primary arm is mounted on the base and can rotate up and down relative to the base. The secondary arm is rotatably mounted on the end of the primary arm away from the base and can rotate up and down relative to the primary arm. The second sand-transporting pipe is mounted on the primary arm and the secondary arm.

[0014] Furthermore, the second sand conveying pipe includes a first hose connector, a hose, and a second hose connector. The two ends of the hose are respectively sleeved on the first hose connector and the second hose connector. The first-stage arm is connected to the first hose connector through the first connector. The end of the second-stage arm away from the first-stage arm is connected to the second hose connector through the second connector. The sand inlet of the first hose connector is the sand inlet of the second sand conveying pipe, and the sand outlet of the second hose connector is the sand outlet of the second sand conveying pipe.

[0015] Furthermore, the foldable sand-throwing arm also includes a first drive mechanism and a second drive mechanism. The first drive mechanism is disposed on the base and the first-stage arm and is used to drive the first-stage arm to rotate up and down relative to the base. The second drive mechanism is disposed on the first-stage arm and the second-stage arm and is used to drive the second-stage arm to rotate up and down relative to the first-stage arm.

[0016] Unlike existing technologies, the above technical solution has the following beneficial effects:

[0017] The sand conveyor can extract sand from any available sand source, no longer limited to vehicle-mounted storage. This means the equipment can be deployed more flexibly wherever there is an external sand source, improving the flexibility and mobility of firefighting operations and shortening firefighting response time. The chassis does not need to carry large amounts of sand, reducing the load on chassis 2, thereby saving fuel and lowering operating costs.

[0018] The power unit supplies energy to the sand-throwing machine according to the equipment's operational needs, enabling the machine to generate sufficient airflow to propel sand particles at high speed. The machine's mobility is also supplied by this unit, ensuring the overall maneuverability of the equipment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of the sand-throwing method used to extinguish the fire in this embodiment;

[0020] Figure 2 This is a cross-sectional view of the sand conveyor in this embodiment;

[0021] Figure 3 This is a cross-sectional view showing the connection between the sand outlet pipe and the sand inlet of the sand throwing machine via a snap-fit ​​mechanism in this embodiment.

[0022] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0023] Figure 5 This is a perspective view of the sand-throwing machine in this embodiment;

[0024] Figure 6 This is a cross-sectional view of the sand-throwing device in this embodiment;

[0025] Figure 7 for Figure 6 Enlarged view of part B in the middle;

[0026] Figure 8 This is a perspective view of the sand-throwing device in this embodiment;

[0027] Figure 9 This is a diagram of the sand-throwing arm in this embodiment.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Sand throwing device; 11. Sand throwing machine; 111. Housing; 112. Sand guide trough; 113. Sand inlet; 12. First sand conveying pipe; 121. Sand outlet; 13. Second sand conveying pipe; 131. First hose connector; 132. Hose; 133. Second hose connector; 134. Sand inlet;

[0030] 2. Chassis;

[0031] 3. Sand conveyor; 31. Sand inlet pipe; 32. Sand outlet pipe; 321. Sand outlet; 322. U-shaped structure; 33. Fixed base; 34. First helical blade; 35. Second helical blade; 36. Dual-shaft motor; 361. Output shaft;

[0032] 4. Snap-fit ​​mechanism; 41. Snap-fit ​​slot; 411. First snap-fit ​​plate; 412. Second snap-fit ​​plate;

[0033] 5. Power unit; 51. Engine; 52. Generator; 53. First hydraulic motor; 54. Second hydraulic motor;

[0034] 6. Sand-throwing arm; 61. Base; 62. Primary arm; 63. Secondary arm; 64. First drive mechanism; 641. First linear motion component; 642. First linkage assembly; 65. Second drive mechanism; 651. Second linear motion component; 652. Second linkage assembly;

[0035] 7. Passageway;

[0036] 8. Rotary mechanism. Detailed Implementation

[0037] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0038] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0039] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0040] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0041] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0042] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0043] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0044] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] Please see Figures 1 to 9 This embodiment provides a sand-throwing fire extinguisher, including a chassis 2 and a sand-throwing device 1. The sand-throwing device 1 is provided on the chassis 2. The sand-throwing device 1 includes a sand-throwing machine 11 for throwing sand particles. The sand-throwing device 1 also includes a sand conveyor 3. The sand conveyor 3 is provided with a sand outlet pipe 32. The sand outlet 321 of the sand outlet pipe 32 is detachably connected to the sand inlet 113 of the sand-throwing machine 11. The sand-throwing fire extinguisher also includes a power unit 5. The power unit 5 is provided on the chassis 2 and is connected to the sand-throwing machine 11, the sand conveyor 3, and the chassis 2 respectively, for providing power to the sand-throwing machine 11, the sand conveyor 3, and the chassis 2.

[0047] The sand thrower 11 is used to generate airflow to drive the movement of sand particles. The sand thrower 11 can be a blade-type sand thrower 11, including a housing 111 and an impeller. The housing 111 is the main supporting structure of the sand thrower 11 and is usually made of high-strength metal materials such as cast iron, steel plate, or aluminum alloy to ensure its strength and durability. The shape and design of the housing 111 vary depending on the type of sand thrower 11 and its application. The housing 111 has a cavity that communicates with the outside through a sand outlet and a sand inlet, allowing air or sand particles to smoothly enter and exit the sand thrower 11. An impeller is located within the cavity, and the impeller shaft is connected to a motor. The impeller can rotate at high speed. Sand particles and other materials enter through the sand inlet and are gradually accelerated to a higher speed by the propulsion of the blades, then thrown out at high speed under the action of high-speed centrifugal force.

[0048] Sand particles are loaded by an external sand conveyor 3, which has the ability to draw sand particles from external sand sources (such as sandbags or sand piles on one side of the chassis 2). The sand conveyor 3 is equipped with a sand discharge pipe 32 that can be detachably connected to the sand inlet 113 of the sand throwing machine 11 for easy assembly and maintenance.

[0049] The sand conveyor 3 can extract sand from any available sand source, no longer limited to vehicle-mounted storage. This means the equipment can be deployed more flexibly wherever there is an external sand source, improving the flexibility and mobility of firefighting operations and shortening firefighting response time. The chassis 2 does not need to carry a large amount of sand, reducing the load on the chassis 2, thereby saving fuel and reducing operating costs.

[0050] The power unit 5 supplies power to the sand thrower 11 according to the equipment's operational needs, enabling the sand thrower 11 to generate sufficient airflow to propel sand particles out at high speed. The chassis 2 is also powered by this unit, ensuring the mobility of the entire equipment.

[0051] Power unit 5 starts, first providing power to chassis 2, enabling the sand-throwing fire truck to quickly reach the fire scene. Then, power unit 5 activates sand conveyor 3 and sand thrower 11. Sand conveyor 3 begins to draw sand from the external sand pile and transports it through sand outlet pipe 32 to sand inlet 113 of sand thrower 11. Sand thrower 11 then uses the generated high-speed airflow to accelerate and accurately throw the sand into the flame area, effectively suppressing the fire through the covering and suffocating effect of the sand until it is extinguished.

[0052] Please see Figure 1In this embodiment, the power unit 5 includes an engine 51, a hydraulic system, and a generator 52. The engine 51 is connected to the hydraulic system, which includes a hydraulic oil pump, a hydraulic oil circuit, a first hydraulic motor 53, and a second hydraulic motor 54. The engine 51 is connected to the hydraulic oil pump, which is connected to the first hydraulic motor 53 and the second hydraulic motor 54 via the hydraulic oil circuit. The first hydraulic motor 53 is connected to the impeller shaft of the sand throwing machine 11, and the second hydraulic motor 54 is connected to the generator 52. The generator 52 is connected to the electrically driven sand conveying motor (also called an electric motor) of the sand conveying machine 3.

[0053] Engine 51 serves as the primary power source, driving the hydraulic pump. The hydraulic pump delivers pressurized hydraulic fluid to the first hydraulic motor 53 and the second hydraulic motor 54 via hydraulic circuits. These two motors drive the impeller of the sand-throwing machine 11 and the generator 52, respectively. The first hydraulic motor 53 is connected to the impeller shaft of the sand-throwing machine 11, converting hydraulic power into rotational power for the blades of the sand-throwing machine 11, generating a high-pressure airflow for throwing sand particles. The second hydraulic motor 54 drives the generator 52 via the hydraulic system, supplying electricity to the electrically driven motors of the sand conveyor 3. These two electrically driven motors drive the spiral blades of the sand conveyor 3, achieving efficient sand particle transport.

[0054] The generator 52 supplies electricity to the electrically driven sand conveying motor of the sand conveyor 3, ensuring precise operation when low speed or fine control is required, while the engine 51 and hydraulic system provide ample energy when high speed or high power is required. The two complement each other, improving the system's energy efficiency and flexibility.

[0055] Please see Figure 1 In this embodiment, the chassis 2 is a hydraulic tracked chassis 2, and the power unit 5 provides power to the hydraulic tracked chassis 2. Specifically, the hydraulic system also includes a third hydraulic motor and a fourth hydraulic motor. The hydraulic oil pump is connected to the third hydraulic motor and the fourth hydraulic motor respectively through hydraulic oil circuits. The third hydraulic motor and the fourth hydraulic motor drive the two tracks of the tracked chassis 2. The hydraulic tracked chassis 2 can significantly improve the ability of sand-throwing fire trucks to pass through harsh terrains, including wetlands, sandy areas, muddy areas, and uneven roads, expanding its applicable range, and is especially suitable for field firefighting needs. The hydraulic system also provides the hydraulic power required for the operation of the tracked chassis 2, and the hydraulic oil pump is connected to the third hydraulic motor of the tracked chassis 2 through hydraulic oil circuits.

[0056] Please see Figure 3 In this embodiment, the sand outlet pipe 32 is connected to the sand inlet 113 of the sand throwing machine 11 via a snap-fit ​​mechanism 4. The snap-fit ​​mechanism 4 provides a fast, reliable, and easy-to-operate connection method, allowing the sand outlet pipe 32 to be easily installed on or removed from the sand throwing machine 11, facilitating maintenance and replacement.

[0057] Please see Figure 4 In this embodiment, the locking mechanism 4 includes a locking groove 41 provided on the outer wall of the sand outlet pipe 32. The sand throwing machine 11 includes a housing 111 and a sand guide groove 112. The housing 111 is provided with a sand guide groove 112, which surrounds the sand inlet of the housing 111. The upper part of the sand guide groove 112 is open. The sand guide groove 112 and the sand inlet of the housing 111 together form the sand inlet 113 of the sand throwing machine 11. The locking groove 41 is locked on the open edge of the sand guide groove 112. The sand guide groove 112 is used to receive the sand particles sent out by the sand outlet 321 of the sand conveyor 3 and guide them into the sand inlet of the housing 111.

[0058] By aligning the slot 41 of the sand outlet pipe 32 with the opening of the sand guide groove 112 on the housing 111 of the sand thrower 11, and through a simple pushing operation, the side wall of the opening is inserted into the slot of the slot 41, achieving a tight fit and physical locking of the two components. At this time, the sand outlet 321 of the sand outlet pipe 32 of the sand conveyor 3 is aligned with or extends into the opening of the sand guide groove 112, allowing the conveyed sand particles to enter the sand guide groove 112. The sand inlet of the housing 111 is located on the side of the sand guide groove 112. The sand particles enter from the upper opening of the sand guide groove 112, move downwards to the bottom, and then turn into the sand inlet of the housing 111 for projection by the sand thrower 11. To remove the sand outlet pipe 32, simply push the slot 41 upwards to separate it from the sand guide groove 112. This design makes the installation and removal of the sand outlet pipe 32 extremely simple, reducing the difficulty of operation, especially in emergency firefighting situations, enabling rapid response and reducing preparation time.

[0059] Please see Figure 3 In this embodiment, the end of the sand outlet pipe 32 is a U-shaped structure 322, and the sand outlet 321 of the sand outlet pipe 32 faces downward and is aligned with the sand guide groove 112 below, which reduces the deviation of sand particles during the falling process. The slot 41 is located diagonally below the sand outlet 321 of the sand outlet pipe 32, avoiding the path of the falling sand particles.

[0060] Please see Figure 4 In this embodiment, the slot component 41 includes a first slotting plate 411 and a second slotting plate 412 spaced apart, forming a slot between the first slotting plate 411 and the second slotting plate 412. The second slotting plate 412 is located in the direction of the first slotting plate 411 toward the center of the sand outlet 321 of the sand outlet pipe 32. The opposite sidewalls of the first slotting plate 411 and the second slotting plate 412 contact the sidewall of the sand guide groove 112 to achieve locking. The lower end of the second slotting plate 412 is bent toward the center of the sand outlet 321 of the sand outlet pipe 32, or the lower end of the first slotting plate 411 is bent away from the center of the sand outlet 321 of the sand outlet pipe 32. The bending design provides a wider mating surface. Figure 4As shown, the first clamping plate 411 is vertical, and the lower end of the second clamping plate 412 is bent towards the center of the sand outlet 321 of the sand outlet pipe 32. The large width between the lower ends of the first clamping plate 411 and the second clamping plate 412 allows the operator to intuitively align the position during installation and quickly complete the clamping, thus improving assembly efficiency and ease of operation.

[0061] In some embodiments, the sand outlet 321 of the sand outlet pipe 32 and the sand inlet 113 of the sand throwing machine 11 are connected by various detachable fittings such as flanges and fire-fighting connectors.

[0062] Please see Figure 2 In this embodiment, the sand conveyor 3 includes a fixed base 33, a sand inlet pipe 31, a sand conveying motor, a first spiral blade 34, and a second spiral blade 35. The fixed base 33 has a cavity, and the inlet and outlet of the cavity are respectively connected to the sand outlet pipe 32 and the sand inlet pipe 31. The first spiral blade 34 and the second spiral blade 35 are respectively mounted in the cavity through bearing seats. The first spiral blade 34 extends into the sand inlet pipe 31, and the second spiral blade 35 extends into the sand outlet pipe 32. The sand conveying motor is mounted on the fixed base 33 and is used to drive the first spiral blade 34 and the second spiral blade 35 to rotate.

[0063] Please see Figure 2 In this embodiment, the sand conveying motor is a dual-shaft motor 36 with two output shafts 361. The two output shafts 361 are respectively connected to the first spiral blade 34 and the second spiral blade 35, thereby driving the first spiral blade 34 and the second spiral blade 35 to rotate to transport sand particles.

[0064] In some embodiments, the sand conveying motor includes a first motor and a second motor, both of which are mounted on a fixed base 33. The first motor is connected to a first spiral blade 34, and the second motor is connected to a second spiral blade 35. That is, the first motor drives the first spiral blade 34 to rotate, and the second motor drives the second spiral blade 35 to rotate.

[0065] The fixed base 33 has an internal cavity with an inlet connected to a sand inlet pipe 31 to receive external sand particles, and an outlet connected to a sand outlet pipe 32 to output sand particles to the sand inlet 113 of the sand thrower 11. This layout forms a continuous sand particle conveying channel. A first motor and a second motor drive a first spiral blade 34 and a second spiral blade 35, respectively. These two motors work synchronously, ensuring continuous and efficient sand particle transmission from the inlet to the outlet within the cavity. The first and second motors can be electrically driven (motors) or hydraulically driven. Electrical drive is preferred. The first spiral blade 34 is installed inside the sand inlet pipe 31, pushing sand particles into the cavity through rotation. The second spiral blade 35 is located inside the sand outlet pipe 32, pushing sand particles out of the cavity, ensuring a continuous sand particle flow. The first helical blade 34 and the second helical blade 35 are fixed in the cavity by bearing housings, which ensures their stability and durability during high-speed rotation. The ingenious extension design of the two sets of blades ensures that the flow of sand particles in the cavity is both smooth and efficient, reducing the possibility of blockage.

[0066] In this embodiment, the sand inlet pipe 31 and the sand outlet pipe 32 are flexible hoses, and the first spiral blade 34 and the second spiral blade 35 are flexible shaftless spiral blades.

[0067] The flexible hose design allows the pipe to be easily bent and folded, facilitating its laying in complex terrain and bypassing obstacles. The hose's flexibility also helps absorb vibrations during sand transport, reducing mechanical wear. The shaftless helical blades refer to a design without a central shaft, simplifying the structure, reducing wear due to the shaft, and minimizing sand residue on the blades. In this case, the roots of the helical blades (first helical blade 34, second helical blade 35) are located on the bearing housing and are connected to the sand transport motor (first motor / second motor / dual-shaft motor). The flexible design means the helical blades can be bent according to their operating conditions; the blades can be made of spring steel.

[0068] During operation, the sand outlet pipe 32 and sand inlet pipe 31 are extended and aligned with their respective work targets. When not in operation, the originally extended sand outlet pipe 32 and sand inlet pipe 31 are bent and retracted, significantly reducing the space occupied by the entire device. It can be transported via sand-throwing equipment or other vehicles.

[0069] In some embodiments, the sand inlet pipe 31 and the sand outlet pipe 32 are rigid pipes, and the first spiral blade 34 and the second spiral blade 35 are shaftless spiral blades or shafted spiral blades.

[0070] In this embodiment, the first motor and the second motor are located outside the cavity and are connected to the first helical blade 34 and the second helical blade 35 respectively through a speed-changing transmission structure such as a belt, chain, gear or chain.

[0071] Please see Figure 6 In this embodiment, the sand-throwing fire engine also includes a first sand-transporting pipe 12 and a second sand-transporting pipe 13. The sand outlet of the sand-throwing machine 11 is connected to the sand inlet of the first sand-transporting pipe 12. The first sand-transporting pipe 12 is located below the second sand-transporting pipe 13. The sand outlet 121 of the first sand-transporting pipe 12 extends into the sand inlet 134 of the second sand-transporting pipe 13. The outer diameter of the sand outlet 121 of the first sand-transporting pipe 12 is smaller than the inner diameter of the sand inlet 134 of the second sand-transporting pipe 13, so that a channel 7 for gas flow is formed between the outer wall of the sand outlet 121 of the first sand-transporting pipe 12 and the inner wall of the sand inlet 134 of the second sand-transporting pipe 13.

[0072] The sand outlet 121 of the sand throwing machine 11 is tightly connected to the sand inlet of the first sand conveying pipe 12, which receives the sand particles and other materials thrown out at high speed. The outer diameter of the sand outlet 121 of the first sand conveying pipe 12 is smaller than the inner diameter of the sand inlet 134 of the second sand conveying pipe 13, so that the first sand conveying pipe 12 can extend into the second sand conveying pipe 13, forming an annular gap between the outer wall of the sand outlet 121 of the first sand conveying pipe 12 and the inner wall of the sand inlet 134 of the second sand conveying pipe 13. This gap is the channel 7 for gas flow.

[0073] When sand particles move at high speed, they are affected by pressure and a certain amount of air is adsorbed near channel 7. This adsorbed air works together with the airflow generated by the original sand throwing machine 11, which makes the sand particles achieve a greater jet speed when moving at high speed, which can significantly increase the throwing distance of the sand particles and has strong adaptability.

[0074] Please see Figure 7 In this embodiment, the outer wall of the sand outlet 121 of the first sand conveying pipe 12 is spaced 10-20mm from the inner wall of the sand inlet 134 of the second sand conveying pipe 13. (See also...) Figure 7 The mark D in the diagram. Optionally, the distance between the outer wall of the sand outlet 121 of the first sand conveying pipe 12 and the inner wall of the sand inlet 134 of the second sand conveying pipe 13 can be 10mm, 11mm, 12mm, 15mm, 18mm, or 20mm. An excessively large distance will increase air resistance, while an excessively small distance will affect gas flow. In some embodiments, the distance between the outer wall of the sand outlet 121 of the first sand conveying pipe 12 and the inner wall of the sand inlet 134 of the second sand conveying pipe 13 can be less than 10mm or greater than 20mm, but the jet velocity of the sand particles will be lower than the 10-20mm range.

[0075] Please see Figure 7 In this embodiment, the first sand conveying pipe 12 extends 20-60mm into the sand inlet 134 of the second sand conveying pipe 13, as shown in the reference. Figure 7The mark L in the design. The reasonable insertion length reduces the ineffective loss of airflow during the conveying process, avoids airflow turbulence or poor sand particle transmission caused by excessive or insufficient length, and improves the stability and reliability of the device.

[0076] Please see Figure 1 and Figure 6 In this embodiment, the sand outlet 121 of the sand throwing machine 11 is located on the top of the sand throwing machine 11, and the first sand conveying pipe 12 extends upward from the sand outlet 121 of the sand throwing machine 11.

[0077] The sand-throwing machine 11 discharges sand-containing airflow directly upward through the sand outlet 121 at its top. This airflow then immediately enters the first sand conveying pipe 12. Direct upward throwing reduces the change in airflow direction and reduces the loss of kinetic energy of the airflow, allowing the sand particles to obtain a higher initial velocity at the beginning of the conveying process, which helps to obtain a greater throwing distance.

[0078] Please see Figure 1 , Figure 6 and Figure 8 In this embodiment, the sand throwing device 1 also includes a sand throwing arm 6, which is connected to the second sand conveying pipe 13. The sand throwing arm 6 is mounted on the sand throwing machine 11 or is mounted on one side of the sand throwing machine 11.

[0079] The sand-throwing arms 6 all support the second sand conveying pipe 13. Depending on the specific design and application scenario, the sand-throwing arms 6 can be installed on the sand-throwing machine 11 or on one side of the sand-throwing machine 11. When the sand-throwing arms 6 are directly integrated with the sand-throwing machine 11, the housing 111 of the sand-throwing machine 11 is used as a support, and the sand-throwing arms 6 can be more firmly fixed to the housing 111, reducing the number of external connecting parts. Figure 1 , Figure 6 and Figure 8 As shown, the sand-throwing arm 6 is fixed to the top of the housing 111. When the sand-throwing arm 6 is set next to the sand-throwing machine 11, for example, when the sand-throwing arm 6 and the sand-throwing machine 11 are respectively set on the chassis 2 of the sand-throwing fire truck, this layout gives the sand-throwing arm 6 more installation space and can provide better support for the large-span second sand conveying pipe 13.

[0080] Please see Figure 1 , Figure 6 , Figure 8 and Figure 9 In this embodiment, the second sand conveying pipe 13 is foldable, and the sand throwing arm 6 is foldable. The foldable sand throwing arm 6 is used to adjust the height of the sand outlet of the second sand conveying pipe 13.

[0081] Please see Figure 1 , Figure 6 , Figure 8 and Figure 9In this embodiment, the foldable sand-throwing arm 6 includes a base 61, a primary arm 62, and a secondary arm 63. The base 61 is mounted on the sand-throwing machine 11 or the chassis 2. The primary arm 62 is mounted on the base 61 and can rotate up and down relative to the base 61. The secondary arm 63 is rotatably mounted on the end of the primary arm 62 away from the base 61 and can rotate up and down relative to the primary arm 62. A second sand conveying pipe 13 is mounted on the primary arm 62 and the secondary arm 63.

[0082] When the operator needs to adjust the sand-throwing angle, the secondary arm 63 can be rotated up and down around the rotation point of the primary arm 62, and the primary arm 62 can be rotated up and down around the rotation point of the base 61, either manually or via a drive mechanism (such as an electric motor, hydraulic cylinder, or electric actuator). This rotation not only helps adjust the direction and angle of sand throwing but also increases the throwing distance to some extent, adapting to different working environments and needs. The secondary arm 63 can rotate downwards on the primary arm 62, causing the second sand-carrying pipe 13 to bend accordingly and its outlet to descend. Conversely, the secondary arm 63 can rotate upwards on the primary arm 62, causing the second sand-carrying pipe 13 to bend accordingly and its outlet to rise. The primary arm 62 can rotate downwards on the base 61, causing the second sand-carrying pipe 13 to bend accordingly and its outlet to descend. Conversely, the primary arm 62 can rotate upwards on the base 61, causing the second sand-carrying pipe 13 to bend accordingly and its outlet to rise.

[0083] Please see Figure 6 , Figure 8 and Figure 9 In this embodiment, the foldable sand-throwing arm 6 also includes a first driving mechanism 64 and a second driving mechanism 65. The first driving mechanism 64 is disposed on the base 61 and the first-stage arm 62 and is used to drive the first-stage arm 62 to rotate up and down relative to the base 61. The second driving mechanism 65 is disposed on the first-stage arm 62 and the second-stage arm 63 and is used to drive the second-stage arm 63 to rotate up and down relative to the first-stage arm 62.

[0084] Please see Figure 6 , Figure 8 and Figure 9 In this embodiment, the first drive mechanism 64 includes a first linear motion component 641 and a first linkage assembly 642. The first linear motion component 641 can be a component that can extend and retract in a straight line, such as a hydraulic cylinder, a pneumatic cylinder, or an electric actuator. The first linkage assembly 642 can be arranged on the outside of the base 61 and the first-stage arm 62, connecting the base 61 and the first-stage arm 62. The first linear motion component 641 connects the first linkage assembly 642 and the base 61. Preferably, the first linear motion component 641 is placed on the outside of the base 61 and the first-stage arm 62 to make room for the second sand conveying pipe 13 and the first sand conveying pipe 12 to be placed on the inside.

[0085] In some embodiments, the first drive mechanism 64 can be hinged to the base 61 and the first-stage arm 62 via the first linear motion member 641, and the first linear motion member 641 can push the first-stage arm 62 to rotate relative to the base 61.

[0086] In some other embodiments, the first drive mechanism 64 can drive the first-stage arm 62 to rotate around a point of rotation relative to the base 61 via a motor, without employing linear motion components and linkage assemblies.

[0087] Please see Figure 6 , Figure 8 and Figure 9 In this embodiment, the second drive mechanism 65 includes a second linear motion component 651 and a second linkage assembly 652. The second linear motion component can be a component that can extend and retract in a straight line, such as a hydraulic cylinder, a pneumatic cylinder, or an electric actuator. The second linkage assembly 652 can be arranged on the outside of the first-stage arm 62 and the second-stage arm 63, connecting the first-stage arm 62 and the second-stage arm 63. The second linear motion component 651 connects the second linkage assembly 652 to the first-stage arm 62. Preferably, the second linear motion component 651 is placed on the outside of the first-stage arm 62 and the second-stage arm 63 to make room for the second sand conveying pipe 13 to be placed on the inside.

[0088] In some embodiments, the second drive mechanism 65 can be hinged to the primary arm 62 and the secondary arm 63 via the second linear motion member 651, and the second linear motion member 651 can be used to drive the secondary arm 63 to rotate relative to the primary arm 62.

[0089] In some other embodiments, the second drive mechanism 65 can drive the secondary arm 63 to rotate around the rotation point of the primary arm 62 via a motor, without using linear motion components and linkage assemblies.

[0090] Please see Figure 6 , Figure 8 and Figure 9 In this embodiment, the second sand conveying pipe 13 includes a first hose connector 131, a hose 132, and a second hose connector 133. The two ends of the hose 132 are respectively sleeved on the first hose connector 131 and the second hose connector 133. The first-stage arm 62 is connected to the first hose connector 131 through a first connector. The end of the second-stage arm 63 away from the first-stage arm 62 is connected to the second hose connector 133 through a second connector. The sand inlet 134 of the first hose connector 131 is the sand inlet 134 of the second sand conveying pipe 13, and the sand outlet of the second hose connector 133 is the sand outlet of the second sand conveying pipe 13.

[0091] The first and second connectors can be pipe clamps, used to fix the first hose connector 131 and the second hose connector 133. The pipe clamps are removable, making the maintenance and upkeep of the device more convenient and quick. The first hose connector 131 and the second hose connector 133 are located at the two ends of the hose 132 and are used to assemble the hose 132. The connection is made tight, for example, by welding the hose connector to the hose 132. The first hose connector 131 has a sand inlet 134 for the second sand conveying pipe 13, and the second hose connector 133 has a sand outlet for the second sand conveying pipe 13. At this time, the first sand conveying pipe 12 extends into the first hose connector 131.

[0092] The design of hose 132 reduces wear on rigid connections, maintenance frequency, and replacement costs. Because the sand-throwing arm 6 is designed as a foldable structure, operators can manually or mechanically adjust its vertical angle to change the direction and height of sand projection, making firefighting operations more precise and efficient, depending on the specific needs of the fire scene. As the angle of the sand-throwing arm 6 changes, the vertical angle of hose 132 also changes accordingly, thus altering the direction of sand projection.

[0093] In this embodiment, the base 61 itself can be connected to the sand-throwing machine 11, with the structure as follows: Figure 1 As shown, the base 61 itself is mounted on the chassis 2 on one side of the sand-throwing machine 11, ensuring that the entire sand-throwing device 1 is stably installed. The design of the primary arm 62, secondary wall, first drive mechanism 64, base 61, and second drive mechanism 65 enables the sand-throwing arm 6 to move within a range of 0-60°, which can significantly reduce the wear between sand particles and the arm tube, increase the throwing distance, and thus adapt to more diverse working environments and throwing requirements.

[0094] Please see Figure 6 , Figure 8 and Figure 9 In this embodiment, the sand-throwing device 1 further includes a rotating mechanism 8, which has a slot through which the first sand-carrying pipe 12 passes. The rotating mechanism 8 can rotate the carried object left and right (when the rotating mechanism 8 is laid flat). In particular, when the sand-throwing arm 6 is mounted on the sand-throwing machine 11, the sand-throwing arm 6 is mounted on the sand-throwing machine 11 via the rotating mechanism 8, which is used to rotate the sand-throwing arm 6. Figure 5 As shown, a rotary mechanism 8 is provided between the base 61 of the sand-throwing arm 6 and the top of the housing 111 of the sand-throwing machine 11, and the first sand-transporting pipe 12 passes through the rotary mechanism 8 through a slot.

[0095] The first sand conveying pipe 12 and the second sand conveying pipe 13 are designed separately, which ensures that the second sand conveying pipe 13 will not be restricted by the fixed position of the first sand conveying pipe 12 when the sand throwing arm rotates. This ensures the freedom and flexibility of the sand throwing arm 6 when rotating and adjusting the angle, and reduces the risk of sand conveying pipe wear, twisting or even breakage that may be caused by frequent rotation.

[0096] In this embodiment, the slewing mechanism 8 includes a slewing bearing and a power source. The power source can be a hydraulic motor or an electric motor, which drives the slewing bearing to rotate, and the sand-throwing arm 6 and the second sand-transporting pipe 13 mounted on the slewing bearing rotate accordingly. The power source can be provided by a power device 5. If the power source is a hydraulic motor, the hydraulic system can provide hydraulic power to the power source; if the power source is an electric motor, the generator can provide electrical energy to the power source.

[0097] The structure of the rotary mechanism can be found in the patent document with patent number 202121129694.0.

[0098] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of the present invention, or equivalent structural or procedural transformations made using the content of the present invention's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of patent protection of the present invention.

Claims

1. A sand-throwing method for extinguishing fires, characterized in that, The vehicle includes a chassis and a sand-throwing device. The sand-throwing device is mounted on the chassis and includes a sand-throwing machine for throwing sand particles. The sand-throwing device further includes a sand conveyor with a sand outlet pipe. The sand outlet of the sand outlet pipe is detachably connected to the sand inlet of the sand-throwing machine. The sand-throwing fire truck also includes a power unit mounted on the chassis and connected to the sand-throwing machine, the sand conveyor, and the chassis, respectively, for providing power to the sand-throwing machine, the sand conveyor, and the chassis. It also includes a first sand conveying pipe and a second sand conveying pipe. The sand outlet of the sand throwing machine is connected to the sand inlet of the first sand conveying pipe. The first sand conveying pipe is located below the second sand conveying pipe. The sand outlet of the first sand conveying pipe extends into the sand inlet of the second sand conveying pipe. The outer diameter of the sand outlet of the first sand conveying pipe is smaller than the inner diameter of the sand inlet of the second sand conveying pipe, so that a channel for gas flow is formed between the outer wall of the sand outlet of the first sand conveying pipe and the inner wall of the sand inlet of the second sand conveying pipe. It also includes a rotary mechanism, which has a slot through which the first sand conveying pipe passes. The first sand conveying pipe passes through the slot and passes through the rotary mechanism. The sand throwing arm on the rotary mechanism and the second sand conveying pipe rotate as the rotary mechanism rotates.

2. The sand-throwing fire engine according to claim 1, characterized in that, The power unit includes an engine, a hydraulic system, and a generator. The engine is connected to the hydraulic system. The hydraulic system includes a hydraulic oil pump, a hydraulic oil circuit, a first hydraulic motor, and a second hydraulic motor. The engine is connected to the hydraulic oil pump. The hydraulic oil pump is connected to the first hydraulic motor and the second hydraulic motor respectively through the hydraulic oil circuit. The first hydraulic motor is connected to the impeller shaft of the sand throwing machine. The second hydraulic motor is connected to the generator. The generator is connected to the electrically driven sand conveying motor of the sand conveying machine.

3. The sand-throwing fire engine according to claim 1 or 2, characterized in that, The sand conveying machine includes a fixed base, a sand inlet pipe, a sand conveying motor, a first spiral blade, and a second spiral blade. The fixed base has a cavity, and the inlet and outlet of the cavity are respectively connected to the sand outlet pipe and the sand inlet pipe. The first spiral blade and the second spiral blade are respectively mounted in the cavity through bearing seats. The first spiral blade extends into the sand inlet pipe, and the second spiral blade extends into the sand outlet pipe. The sand conveying motor is mounted on the fixed base and is used to drive the first spiral blade and the second spiral blade to rotate.

4. The sand-throwing fire engine according to claim 1, characterized in that, The outer wall of the sand outlet of the first sand conveying pipe is spaced 10-20mm from the inner wall of the sand inlet of the second sand conveying pipe.

5. The sand-throwing fire engine according to claim 1, characterized in that, The first sand conveying pipe extends 20-60mm into the sand inlet of the second sand conveying pipe.

6. The sand-throwing fire engine according to claim 1, characterized in that, The second sand conveying pipe is foldable, and the sand-throwing fire truck also includes a foldable sand-throwing arm. The sand-throwing arm is mounted on the sand-throwing machine or the chassis and is connected to the second sand conveying pipe to adjust the height of the sand outlet of the second sand conveying pipe.

7. The sand-throwing fire engine according to claim 6, characterized in that, The foldable sand-throwing arm includes a base, a primary arm, and a secondary arm. The base is mounted on the sand-throwing machine or the chassis. The primary arm is mounted on the base and can rotate up and down relative to the base. The secondary arm is rotatably mounted on the end of the primary arm away from the base and can rotate up and down relative to the primary arm. The primary arm and the secondary arm are equipped with a second sand-transporting pipe.

8. The sand-throwing fire engine according to claim 7, characterized in that, The second sand conveying pipe includes a first hose connector, a hose, and a second hose connector. The two ends of the hose are respectively sleeved on the first hose connector and the second hose connector. The first-stage arm is connected to the first hose connector through a first connector. The end of the second-stage arm away from the first-stage arm is connected to the second hose connector through a second connector. The sand inlet of the first hose connector is the sand inlet of the second sand conveying pipe, and the sand outlet of the second hose connector is the sand outlet of the second sand conveying pipe.

9. The sand-throwing fire engine according to claim 7, characterized in that, The foldable sand-throwing arm also includes a first drive mechanism and a second drive mechanism. The first drive mechanism is disposed on the base and the first-stage arm and is used to drive the first-stage arm to rotate up and down relative to the base. The second drive mechanism is disposed on the first-stage arm and the second-stage arm and is used to drive the second-stage arm to rotate up and down relative to the first-stage arm.

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