Sand throwing fire extinguishing vehicle and sand throwing device thereof

Abstract

The sand throwing device comprises a sand throwing machine, a first sand conveying pipe and a second sand conveying pipe, a sand outlet of the sand throwing machine is communicated with a sand inlet of the first sand conveying pipe, the first sand conveying pipe is located below the second sand conveying pipe, and the second sand conveying pipe is located below the first sand conveying pipe. The sand outlet of the first sand conveying pipe extends into the sand inlet of the second sand conveying pipe, and 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. And a channel for air circulation 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. When the sand grains move at a high speed, certain air is adsorbed at the position near the channel under the influence of pressure, and the adsorbed air and the airflow generated by the original sand thrower act together, so that the sand grains obtain a higher spraying speed when moving at a high speed, the throwing distance of the sand grains can be remarkably increased, and the sand thrower has relatively strong adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency rescue, in particular to a sand-throwing fire truck and a sand-throwing device thereof. Background Art

[0002] Currently, large sand-throwing fire trucks are widely used in the firefighting industry to address specific fire situations where traditional extinguishing media such as water, foam, or carbon dioxide are unsuitable. These innovative vehicles efficiently disperse sand directly at the source of a fire, significantly enhancing firefighting effectiveness and significantly reducing direct exposure to firefighters in high-risk environments. This provides a solid defense against potential fires, protecting lives and property, and maintaining social stability.

[0003] Chinese patent application publication number CN109529235A discloses a fire extinguishing device and a fire extinguishing vehicle, comprising: a first conveying section for conveying fire extinguishing material; a second conveying section for conveying fire extinguishing material and arranged above the first conveying section; and a first drive mechanism for causing the first conveying section and the second conveying section to move relative to each other, so as to achieve a high-throw mode through the first conveying section and the second conveying section when the first conveying section and the second conveying section are connected, and to achieve a long-throw mode through the first conveying section when the first conveying section and the second conveying section are separated.

[0004] The above patent has the following technical problems: after the first conveying section and the second conveying section are connected, they have a certain length. After the sand and other materials are thrown out by the blades, they move along the first conveying section and the second conveying section. During this period, energy consumption due to collision and friction will be generated, and the distance of the sand being thrown will be affected. Utility Model Content

[0005] To this end, it is necessary to provide a sand-throwing fire truck and its sand-throwing device to solve the problem that the existing first conveying section and the second conveying section have a certain length, and sand and other materials are thrown out by the blades and move along the first conveying section and the second conveying section, during which energy consumption due to collision and friction is generated, and the distance of sand throwing is affected.

[0006] To achieve the above-mentioned purpose, the present embodiment provides a sand slinging device, comprising a sand slinger, a first sand conveying pipe and a second sand conveying pipe, the sand outlet of the sand slinger being connected to the sand inlet of the first sand conveying pipe, the first sand conveying pipe being located below the second sand conveying pipe, the sand outlet of the first sand conveying pipe extending into the sand inlet of the second sand conveying pipe, the outer diameter of the sand outlet of the first sand conveying pipe being smaller than the inner diameter of the sand inlet of the second sand conveying pipe, so that a channel for gas circulation 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.

[0007] Furthermore, the outer wall of the sand outlet of the first sand transport pipe and the inner wall of the sand inlet of the second sand transport pipe are spaced 10-20 mm apart.

[0008] Furthermore, the first sand conveying pipe extends into the sand inlet of the second sand conveying pipe by 20-60 mm.

[0009] Furthermore, an impeller is provided in the sand throwing machine, and the number of blades of the impeller is 4.

[0010] Furthermore, it also includes a rotating mechanism, the sand outlet of the sand slinger is located on the top of the sand slinger, the first sand conveying pipe extends upward from the sand outlet of the sand slinger, and the rotating mechanism is provided with a slot for the first sand conveying pipe to pass through.

[0011] Furthermore, it also includes a sand throwing arm, which is arranged on the sand throwing machine, or the sand throwing arm is arranged beside the sand throwing machine, and the sand throwing arm is provided with the second sand conveying pipe.

[0012] Furthermore, the sand throwing arm is foldable, the second sand conveying pipe is foldable, and the sand throwing arm is connected to the second sand conveying pipe 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 first-level arm and a second-level arm. The base is arranged on the sand slinger or on one side of the sand slinger. The first-level arm is rotatably arranged on the base, and the first-level arm can rotate up and down relative to the base. The second-level arm is rotatably arranged on the end of the first-level arm away from the base, and the second-level arm can rotate up and down relative to the first-level arm. The second sand conveying pipe is provided on the first-level arm and the second-level arm.

[0014] Furthermore, the second sand transport 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-level arm is connected to the first hose connector through the first connecting piece, and the end of the second arm away from the first arm is connected to the second hose connector through the second connecting piece. The sand inlet of the first hose connector is the sand inlet of the second sand transport pipe, and the sand outlet of the second hose connector is the sand outlet of the second sand transport pipe.

[0015] Furthermore, it also includes a rotating mechanism. When the sand throwing arm is provided on the sand throwing machine, the sand throwing arm is provided on the sand throwing machine through the rotating mechanism. The rotating mechanism is used to rotate the sand throwing arm. The rotating mechanism is provided with a slot hole for the first sand conveying pipe to pass through.

[0016] To achieve the above-mentioned purpose, the present embodiment further provides a sand-throwing fire truck, comprising a chassis and a sand-throwing device, wherein the chassis is provided with the sand-throwing device, and the sand-throwing device is the sand-throwing device described in any one of the above-mentioned embodiments.

[0017] Different from the existing technology, the above technical solution has the following beneficial effects:

[0018] The first sand delivery pipe extends into the second sand delivery pipe, creating an annular gap between the outer wall of the first sand delivery pipe's sand outlet and the inner wall of the second sand delivery pipe's sand inlet. This gap serves as a channel for air circulation. As sand particles move at high speeds, they are affected by pressure and absorb a certain amount of air near the channel. This absorbed air, combined with the airflow generated by the original sand slinger, increases the velocity of the sand particles during high-speed propulsion, significantly increasing the distance they can be slinged, and demonstrating their strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional diagram of the sand throwing device in this embodiment;

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

[0021] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0022] Figure 4 This is a working diagram of the sand throwing arm in this embodiment;

[0023] Figure 5 It is a three-dimensional diagram of the sand-throwing fire truck in this embodiment.

[0024] Description of reference numerals:

[0025] 1. Sand throwing device; 11. Sand throwing machine; 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; 14. Base;

[0026] 2. Chassis;

[0027] 3. Sand throwing arm; 31. Base; 32. Primary arm; 33. Secondary arm; 34. First driving mechanism; 341. First linear motion member; 342. First connecting rod assembly; 35. Second driving mechanism; 351. Second linear motion member; 352. Second connecting rod assembly;

[0028] 4. Channel;

[0029] 5. Rotating mechanism. DETAILED DESCRIPTION

[0030] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0031] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0032] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0033] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0034] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0035] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0036] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0037] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating 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, it should not be understood as a limitation on the embodiments of the present application.

[0038] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated 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 elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] See also Figures 1 to 5 This embodiment provides a sand slinging device, including a sand slinger 11, a first sand conveying pipe 12 and a second sand conveying pipe 13. The sand outlet of the sand slinger 11 is connected to the sand inlet of the first sand conveying pipe 12. The first sand conveying pipe 12 is located below the second sand conveying pipe 13. The sand outlet 121 of the first sand conveying pipe 12 extends into the sand inlet 134 of the second sand conveying pipe 13. 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 a channel 4 for gas circulation is formed 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.

[0040] The sand slinger 11 is used to generate airflow to drive the movement of sand particles, and the first sand conveying pipe 12 and the second sand conveying pipe 13 are used to form a conveying channel 4 for sand particles. The sand slinger 11 can be a blade-type sand slinger 11, including a shell and an impeller. The shell is the main supporting structure of the sand slinger 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 shell will vary depending on the type and application scenario of the sand slinger 11. A cavity is provided in the shell, and the cavity is connected to the outside world through a sand outlet and a sand inlet so that air or sand particles can smoothly enter and leave the sand slinger 11. An impeller is provided in the cavity, and the shaft of the impeller is connected to the motor. The impeller can rotate at high speed, and sand and other materials enter through the sand inlet. Under the push of the blades, they are gradually accelerated to a higher speed and thrown out at high speed under the action of high-speed centrifugal force.

[0041] The sand outlet of the sand slinger 11 is tightly connected to the sand inlet of the first sand conveying pipe 12. The first sand conveying pipe 12 receives sand 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. This allows the first sand conveying pipe 12 to 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 serves as the gas flow channel 4.

[0042] When the sand moves at high speed, it is affected by pressure and absorbs a certain amount of air near the channel 4. This part of the absorbed air works together with the airflow generated by the original sand throwing machine 11, so that the sand obtains a greater ejection speed when moving at high speed, which can significantly increase the throwing distance of the sand and has strong adaptability.

[0043] See also Figure 2 and Figure 3 In this embodiment, 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 are spaced 10-20 mm apart. Figure 3 Mark D in . 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. Too large a distance will increase air resistance, while too small a distance will affect the circulation of gas. In some embodiments, the distance 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 can be less than 10mm, or greater than 20mm, but the injection velocity of the sand particles is inferior to the range of 10-20mm.

[0044] See also Figure 2 and Figure 3In this embodiment, the first sand conveying pipe 12 extends into the sand inlet 134 of the second sand conveying pipe 13 by 20-60 mm, as shown in FIG. Figure 3 The mark L in the middle. Reasonable extension length design reduces the ineffective loss of airflow during the transportation process, avoids the airflow turbulence or poor sand transmission caused by too long or too short, and improves the stability and reliability of the device.

[0045] In this embodiment, an impeller is provided in the sand throwing machine 11. The number of blades of the impeller is 4. The impeller has high efficiency and a long average throwing distance.

[0046] The impeller, the core component of the sand slinger 11, is driven by a motor to rotate and generate airflow. Each impeller is equipped with four blades. This number of blades ensures sufficient airflow generation while maintaining low manufacturing complexity and maintenance costs.

[0047] See also Figure 1 and Figure 2 In this embodiment, the sand outlet of the sand slinger 11 is located on the top of the sand slinger 11 , and the first sand conveying pipe 12 extends upward from the sand outlet of the sand slinger 11 .

[0048] The sand throwing machine 11 discharges the sand-laden airflow directly upward through the sand outlet at its top, and the airflow then immediately enters the first sand conveying pipe 12 upward. The direct upward projection reduces the change in the direction of the airflow and reduces the kinetic energy loss of the airflow, so that the sand particles can obtain a higher initial velocity at the beginning of the conveying process, which helps to obtain a longer projection distance.

[0049] See also Figure 1 、 Figure 2 and Figure 5 In this embodiment, the shell of the sand slinger 11 is arranged on the chassis 2 through the base 14. The connection between the base 14 and the chassis 2 can be a threaded connection to maintain the stability of the sand slinger 11.

[0050] See also Figure 1 and Figure 2 In this embodiment, the sand throwing device 1 further includes a sand throwing arm 3, which is connected to the second sand conveying pipe 13. The sand throwing arm 3 is provided on the sand throwing machine 11, and the structure is as follows: Figure 5 Shown, or sand throwing arm 3 is located beside the sand throwing machine 11.

[0051] The sand throwing arm 3 supports the second sand conveying pipe 13. Depending on the specific design and application scenario, the sand throwing arm 3 can be installed on the sand throwing machine 11 or on the side of the sand throwing machine 11. When the sand throwing arm 3 is directly integrated with the sand throwing machine 11, the sand throwing arm 3 uses the shell of the sand throwing machine 11 as support, and the sand throwing arm 3 can be fixed to the shell more firmly, reducing the number of external connectors. Figure 5As shown, the sand throwing arm 3 is fixed to the top of the housing. When the sand throwing arm 3 is arranged beside the sand throwing machine 11, for example, the sand throwing arm 3 and the sand throwing machine 11 are respectively arranged on the chassis 2 of the sand throwing fire truck, such a layout provides a larger installation space for the sand throwing arm 3, which can better support the second sand conveying pipe 13 with a large span.

[0052] See also Figure 1 、 Figure 2 and Figure 4 In this embodiment, the second sand conveying pipe 13 is foldable, and the sand throwing arm 3 is a foldable sand throwing arm 3 . The foldable sand throwing arm 3 is used to adjust the height of the sand outlet of the second sand conveying pipe 13 .

[0053] See also Figure 1 、 Figure 2 and Figure 4 In this embodiment, the foldable sand throwing arm 3 includes a base 31, a first-level arm 32 and a second-level arm 33. The base 31 is arranged on the sand throwing machine 11 or the chassis 2. The first-level arm 32 is provided on the base 31. The first-level arm 32 can rotate up and down relative to the base 31. The second-level arm 33 is rotatably provided on the end of the first-level arm 32 away from the base 31. The second-level arm 33 can rotate up and down relative to the first-level arm 32. The first-level arm 32 and the second-level arm 33 are provided with a second sand conveying pipe 13.

[0054] When the operator needs to adjust the sand throwing angle, the secondary arm 33 can be manually rotated about its pivot point with the primary arm 32, or the primary arm 32 can be rotated about its pivot point with the base 31, either manually or through a drive mechanism (such as an electric motor, hydraulic cylinder, or electric push rod). This rotation not only helps adjust the direction and angle of sand throwing but also increases the distance of sand throwing to a certain extent, adapting to different working environments and needs. The secondary arm 33 can be rotated downward on the primary arm 32, causing the second sand conveying pipe 13 to bend accordingly, lowering the sand outlet of the second sand conveying pipe 13. Conversely, the secondary arm 33 can be rotated upward on the primary arm 32, causing the second sand conveying pipe 13 to bend accordingly, raising the sand outlet of the second sand conveying pipe 13. The primary arm 32 can be rotated downward on the base 31, causing the second sand conveying pipe 13 to bend accordingly, lowering the sand outlet of the second sand conveying pipe 13. Conversely, the primary arm 32 can be rotated upward on the base 31, causing the second sand conveying pipe 13 to bend accordingly, raising the sand outlet of the second sand conveying pipe 13.

[0055] See also Figure 1 、 Figure 2 and Figure 4In this embodiment, the foldable sand throwing arm 3 also includes a first driving mechanism 34 and a second driving mechanism 35. The first driving mechanism 34 is provided on the base 31 and the first arm 32, and is used to drive the first arm 32 to rotate up and down relative to the base 31. The second driving mechanism 35 is provided on the first arm 32 and the second arm 33, and is used to drive the second arm 33 to rotate up and down relative to the first arm 32.

[0056] In this embodiment, the first drive mechanism 34 includes a first linear motion member 341 and a first connecting rod assembly 342. The first linear motion member 341 can be a component that can be extended and retracted in a linear direction, such as a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. The first connecting rod assembly 342 can be disposed outside the base 31 and the primary arm 32, connecting the base 31 and the primary arm 32 via the first connecting rod assembly 342, and the first linear motion member 341 connects the first connecting rod assembly 342 and the base 31. Preferably, the first linear motion member 341 is placed outside the base 31 and the primary arm 32 to free up space inside for the second and first sand conveying pipes 13 and 12.

[0057] In some embodiments, the first driving mechanism 34 may be hinged to the base 31 and the primary arm 32 via a first linear motion member 341 , and the first linear motion member 341 may drive the primary arm 32 to rotate relative to the base 31 .

[0058] In some other embodiments, the first driving mechanism 34 may drive the primary arm 32 to rotate around the rotation point with the base 31 via a motor, without using a linear motion part and a connecting rod assembly.

[0059] See also Figure 1 、 Figure 2 and Figure 4 In this embodiment, the second drive mechanism 35 includes a second linear motion member 351 and a second connecting rod assembly 352. The second linear motion member 351 can be a linearly extendable component such as a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. The second connecting rod assembly 352 can be disposed outside the primary arm 32 and the secondary arm 33, connecting the primary arm 32 and the secondary arm 33 via the second connecting rod assembly 352. The second linear motion member 351 connects the second connecting rod assembly 352 and the primary arm 32. Preferably, the second linear motion member 351 is placed outside the primary arm 32 and the secondary arm 33 to free up space for the second sand conveying pipe 13 inside.

[0060] In some embodiments, the second driving mechanism 35 may be hinged to the primary arm 32 and the secondary arm 33 via a second linear motion member 351 , and the second linear motion member 351 may drive the secondary arm 33 to rotate relative to the primary arm 32 .

[0061] In some other embodiments, the second driving mechanism 35 may drive the secondary arm 33 to rotate around the rotation point with the primary arm 32 via a motor, without using a linear motion part and a connecting rod assembly.

[0062] See also Figure 1 、 Figure 2 and Figure 4 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 arm 32 is connected to the first hose connector 131 via a first connector. The end of the second arm 33 away from the first arm 32 is connected to the second hose connector 133 via a second connector. The sand inlet 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.

[0063] The first and second connectors can be detachable pipe clamps, securing the first and second hose connectors 131, 133. These clamps are removable, making maintenance and servicing of the device more convenient and quicker. The first and second hose connectors 131, 133 are located at the ends of the hose 132 and are used to assemble the hose 132. The connections are tightly secured, such as by welding the hose connectors to the hose 132. The first hose connector 131 defines a sand inlet 134 for the second sand transport pipe 13, while the second hose connector 133 defines a sand outlet for the second sand transport pipe 13. The first sand transport pipe 12 extends into the first hose connector 131.

[0064] The design of hose 132 reduces wear, maintenance, and replacement costs associated with hard connections. Because the sand throwing arm 3 is foldable, operators can manually or mechanically adjust the vertical angle of the arm 3 to suit the specific needs of the firefighting scene, thereby changing the direction and height of the sand, making firefighting more precise and efficient. As the angle of the sand throwing arm 3 changes, the vertical angle of hose 132 also changes, thereby changing the direction of sand throwing.

[0065] In this embodiment, the base 31 itself can be connected to the sand throwing machine 11, and the structure is as follows: Figure 5 As shown, the base 31 itself is mounted on the chassis 2 on one side of the sand slinger 11. This ensures that the entire sand slinging device 1 is securely mounted. The design of the primary arm 32, secondary wall, first drive mechanism 34, base 31, and second drive mechanism 35 enables the sand slinging arm 3 to move within a range of 0-60°, significantly reducing wear between sand particles and the arm tube and increasing the slinging distance, thus adapting to a wider range of working environments and slinging requirements.

[0066] See also Figure 1 and Figure 2In this embodiment, the sand slinging device 1 further includes a swivel mechanism 5 having a slot for the first sand conveying pipe 12 to pass through. The swivel mechanism 5 can rotate the carried object left and right (when the swivel mechanism 5 is laid flat). In particular, when the sand slinging arm 3 is mounted on the sand slinger 11, the sand slinging arm 3 is mounted on the sand slinger 11 via the swivel mechanism 5, and the swivel mechanism 5 is used to rotate the sand slinging arm 3. Figure 5 As shown, a rotating mechanism 5 is provided between the base 31 of the sand slinging arm 3 and the top of the shell of the sand slinger 11 , and the first sand conveying pipe 12 passes through the rotating mechanism 5 through a slot.

[0067] The first sand conveying pipe 12 and the second sand conveying pipe 13 are designed to be separated, ensuring that the second sand conveying pipe 13 will not be restricted by the fixed position of the first sand conveying pipe 12 when rotating with the sand throwing arm, ensuring the freedom and flexibility of the sand throwing arm 3 when rotating and adjusting the angle, and reducing the risk of wear, distortion or even breakage of the sand conveying pipe caused by frequent rotation.

[0068] In this embodiment, the slewing mechanism 5 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 3 and the second sand conveying pipe 13 mounted on the slewing bearing rotate accordingly. The structure of the slewing mechanism can be referenced in patent document No. 202121129694.0.

[0069] See also Figures 1 to 5 This embodiment also provides a sand-throwing fire truck, including a chassis 2 and a sand-throwing device 1. The chassis 2 is provided with the sand-throwing device 1, and the sand-throwing device 1 is the sand-throwing device 1 described in any one of the above embodiments.

[0070] In this embodiment, the chassis 2 can be a wheeled chassis 2 or a tracked chassis 2. The wheeled chassis 2 provides fast and flexible road mobility, suitable for quickly reaching the fire scene on a straight and level road. The tracked chassis 2 is good at off-roading, especially in soft, muddy, and irregular terrains, maintaining stability. Figure 5 shown.

[0071] In this embodiment, the chassis 2 is provided with a power source for operating the sand slinger 11 and the folding arm.

[0072] 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 utility model. Therefore, based on the innovative concept of the present utility model, changes and modifications to the embodiments described herein, or equivalent structural or process transformations made using the contents of the present utility model specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields are all included in the scope of protection of the present utility model patent.

Claims

1. A sand throwing device, characterized in that: It includes a sand slinger, a first sand conveying pipe and a second sand conveying pipe. The sand outlet of the sand slinger 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 circulation 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.

2. The sand throwing device according to claim 1, characterized in that: The outer wall of the sand outlet of the first sand transport pipe and the inner wall of the sand inlet of the second sand transport pipe are spaced 10-20 mm apart.

3. The sand throwing device according to claim 1, characterized in that: The first sand transport pipe extends into the sand inlet of the second sand transport pipe by 20-60 mm.

4. The sand throwing device according to claim 1, characterized in that: An impeller is provided in the sand throwing machine, and the number of blades of the impeller is 4.

5. The sand throwing device according to any one of claims 1 to 4, characterized in that: It also includes a rotating mechanism, the sand outlet of the sand slinger is located on the top of the sand slinger, the first sand conveying pipe extends upward from the sand outlet of the sand slinger, and the rotating mechanism is provided with a slot for the first sand conveying pipe to pass through.

6. The sand throwing device according to any one of claims 1 to 4, characterized in that: It also includes a sand throwing arm, which is arranged on the sand throwing machine, or the sand throwing arm is arranged beside the sand throwing machine, and the sand throwing arm is provided with the second sand conveying pipe.

7. The sand throwing device according to claim 6, characterized in that: The sand throwing arm is foldable, the second sand conveying pipe is foldable, and 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.

8. The sand throwing device according to claim 7, characterized in that: The foldable sand-throwing arm includes a base, a first-level arm and a second-level arm. The base is arranged on the sand slinger or on one side of the sand slinger. The first-level arm is rotatably arranged on the base, and the first-level arm can rotate up and down relative to the base. The second-level arm is rotatably arranged on the end of the first-level arm away from the base, and the second-level arm can rotate up and down relative to the first-level arm. The second sand conveying pipe is provided on the first-level arm and the second-level arm.

9. The sand throwing device according to claim 8, characterized in that: The second sand transport pipe includes a first hose connector, a hose and a second hose connector. Both ends of the hose are respectively sleeved on the first hose connector and the second hose connector. The first-level arm is connected to the first hose connector through a first connecting piece. The end of the second-level arm away from the first-level arm is connected to the second hose connector through a second connecting piece. The sand inlet of the first hose connector is the sand inlet of the second sand transport pipe, and the sand outlet of the second hose connector is the sand outlet of the second sand transport pipe.

10. The sand throwing device according to any one of claims 7 to 9, characterized in that: It also includes a rotating mechanism. When the sand throwing arm is arranged on the sand throwing machine, the sand throwing arm is arranged on the sand throwing machine through the rotating mechanism. The rotating mechanism is used to rotate the sand throwing arm. The rotating mechanism is provided with a slot hole for the first sand conveying pipe to pass through.

11. The sand throwing device according to claim 6, characterized in that: It also includes a rotating mechanism. When the sand throwing arm is arranged on the sand throwing machine, the sand throwing arm is arranged on the sand throwing machine through the rotating mechanism. The rotating mechanism is used to rotate the sand throwing arm. The rotating mechanism is provided with a slot hole for the first sand conveying pipe to pass through.

12. A sand throwing fire truck, characterized in that: It comprises a chassis and a sand throwing device, wherein the chassis is provided with the sand throwing device, and the sand throwing device is the sand throwing device according to any one of claims 1 to 11.

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