Sand throwing fire extinguishing vehicle and sand throwing device thereof

Abstract

The sand throwing device comprises a sand throwing machine, a sand conveying pipe and a sand throwing arm, a sand outlet of the sand throwing machine is communicated with a sand inlet of the sand conveying pipe, the sand throwing arm comprises a base, a first-stage arm, a second-stage arm, a first driving mechanism and a second driving mechanism, the base is arranged on the sand throwing machine, the first-stage arm is arranged on the first-stage arm, and the second-stage arm is arranged on the second-stage arm. The sand conveying pipe is arranged on the first-stage arm and the second-stage arm, the first-stage arm is rotatably arranged on the base, the first driving mechanism is used for driving the first-stage arm to rotate up and down relative to the base, the second-stage arm is rotatably arranged at the end, away from the base, of the first-stage arm, and the second-stage arm is used for driving the second-stage arm to rotate up and down relative to the base. And the second driving mechanism is used for driving the second-stage arm to rotate up and down relative to the first-stage arm, the sand throwing direction and angle can be adjusted, precise sand throwing operation is achieved, the sand throwing distance can be increased to a certain degree, and different working environments and requirements are met.

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, in the face of special fire situations where it is not suitable to use traditional fire extinguishing media such as water, foam or carbon dioxide, large sand-throwing fire trucks are generally adopted as a response strategy in the fire protection field. Such innovative vehicles directly intervene in the fire source by efficiently throwing sand, not only greatly enhancing the fire extinguishing efficiency, but also significantly reducing the direct risk exposure of firefighters in high-risk environments, thus building a solid defense line for protecting people's lives and property and maintaining social stability.

[0003] The throwing distance of the existing sand-throwing fire truck is fixed and cannot be adjusted in real time according to the on-site requirements, resulting in poor applicability. Content of the Utility Model

[0004] Therefore, it is necessary to provide a sand-throwing fire truck and a sand-throwing device thereof to solve the problem that the throwing distance of the existing sand-throwing fire truck is fixed and cannot be adjusted in real time according to the on-site requirements.

[0005] To achieve the above object, the present embodiment provides a sand-throwing device, including a sand-throwing machine, a sand conveying pipe and a sand-throwing arm. The sand-throwing machine is used to throw sand grains. The sand outlet of the sand-throwing machine is communicated with the sand inlet of the sand conveying pipe. The sand-throwing arm includes a base, a first-stage arm, a second-stage arm, a first driving mechanism and a second driving mechanism. The base is arranged on the sand-throwing machine. The sand conveying pipe is arranged on the first-stage arm and the second-stage arm. The first-stage arm is rotatably arranged on the base. The first driving mechanism is arranged on the base and the first-stage arm. The first driving mechanism is used to drive the first-stage arm to rotate up and down relative to the base. The second-stage arm is rotatably arranged at one end of the first-stage arm away from the base. The second driving mechanism is arranged on the first-stage arm and the second-stage arm. The second driving mechanism is used to drive the second-stage arm to rotate up and down relative to the first-stage arm.

[0006] Further, the first driving mechanism includes a first link assembly and a first linear motion member. The first link assembly is respectively hinged to the base and the first-stage arm. The first link assembly is also connected to one end of the first linear motion member. The other end of the first linear motion member is hinged to the base or the first-stage arm; and / or:

[0007] The second driving mechanism includes a second link assembly and a second linear motion member. The second link assembly is respectively hinged to the first-stage arm and the second-stage arm. The first link assembly is also connected to one end of the second linear motion member. The other end of the second linear motion member is hinged to the first-stage arm or the second-stage arm.

[0008] Further, the first link assembly includes a first link and a second link. One end of the first link is hinged to the primary arm, the other end of the first link is hinged to one end of the second link, and the other end of the second link is hinged to the base.

[0009] Further, one end of the first link away from the primary arm, one end of the second link away from the base, and one end of the first linear motion member are hinged together by a first pin.

[0010] Further, the first link has a Y-shaped structure. The wider end of the Y-shaped structure is hinged to the primary arm, and the narrower end of the Y-shaped structure is hinged to the second link; and / or:

[0011] The second link has a Y-shaped structure. The wider end of the Y-shaped structure is hinged to the base, and the narrower end of the Y-shaped structure is hinged to the first link.

[0012] Further, the Y-shaped first link includes a first connecting member, a second connecting member, a third connecting member, a fourth connecting member, and a fifth connecting member. The first connecting member and the second connecting member are symmetrically arranged on the third connecting member and are located on the side of the third connecting member close to the primary arm. The first connecting member and the second connecting member are the wider ends of the Y-shaped structure. The fourth connecting member and the fifth connecting member are symmetrically arranged on the third connecting member and are located on the side of the third connecting member away from the primary arm. The fourth connecting member and the fifth connecting member are the narrower ends of the Y-shaped structure; and / or:

[0013] The Y-shaped second link includes a sixth connecting member, a seventh connecting member, an eighth connecting member, a ninth connecting member, and a tenth connecting member. The sixth connecting member and the seventh connecting member are symmetrically arranged on the eighth connecting member and are located on the side of the eighth connecting member close to the base. The sixth connecting member and the seventh connecting member are the wider ends of the Y-shaped structure. The ninth connecting member and the tenth connecting member are symmetrically arranged on the eighth connecting member and are located on the side of the eighth connecting member away from the base. The ninth connecting member and the tenth connecting member are the narrower ends of the Y-shaped structure.

[0014] Further, the second link assembly includes a third link and a fourth link. One end of the third link is hinged to the secondary arm, the other end of the third link is hinged to one end of the fourth link, and the other end of the fourth link is hinged to the primary arm.

[0015] Further, one end of the third link away from the secondary arm, one end of the fourth link away from the primary arm, and one end of the second linear motion member are hinged together by a second pin.

[0016] Further, the third connecting rod is in a Y-shaped structure, and the end with a larger width thereof is hinged to the secondary arm, and the end with a smaller width thereof is hinged to the fourth connecting rod; and / or:

[0017] The fourth connecting rod is in a Y-shaped structure, and the end with a larger width thereof is hinged to the primary arm, and the end with a smaller width thereof is hinged to the third connecting rod.

[0018] Further, the third connecting rod of the Y-shaped structure includes an eleventh connecting member, a twelfth connecting member, a thirteenth connecting member, a fourteenth connecting member and a fifteenth connecting member. The eleventh connecting member and the twelfth connecting member are symmetrically arranged on the thirteenth connecting member and are located on one side of the thirteenth connecting member close to the secondary arm. The eleventh connecting member and the twelfth connecting member are the ends with a larger width of the Y-shaped structure. The fourteenth connecting member and the fifteenth connecting member are symmetrically arranged on the thirteenth connecting member and are located on one side of the thirteenth connecting member away from the secondary arm. The fourteenth connecting member and the fifteenth connecting member are the ends with a smaller width of the Y-shaped structure; and / or:

[0019] The fourth connecting rod of the Y-shaped structure includes a sixteenth connecting member, a seventeenth connecting member, an eighteenth connecting member, a nineteenth connecting member and a twentieth connecting member. The sixteenth connecting member and the seventeenth connecting member are symmetrically arranged on the eighteenth connecting member and are located on one side of the eighteenth connecting member close to the primary arm. The sixteenth connecting member and the seventeenth connecting member are the ends with a larger width of the Y-shaped structure. The nineteenth connecting member and the twentieth connecting member are symmetrically arranged on the eighteenth connecting member and are located on one side of the eighteenth connecting member away from the primary arm. The nineteenth connecting member and the twentieth connecting member are the ends with a smaller width of the Y-shaped structure.

[0020] To achieve the above object, the present embodiment further provides a sand-throwing fire truck, including a chassis and a sand-throwing device. The sand-throwing device is provided on the chassis, and the sand-throwing device is the sand-throwing device described in any one of the above embodiments.

[0021] Different from the prior art, the above technical solution has the following beneficial effects:

[0022] The first driving mechanism rotates the primary arm up and down around the rotation point with the base, and the second driving mechanism rotates the secondary arm up and down around the rotation point with the primary arm. This rotation can not only help adjust the direction and angle of sand throwing to achieve precise sand-throwing operation, but also improve the sand-throwing distance to a certain extent to adapt to different working environments and requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view of the sand-throwing fire truck in this embodiment;

[0024] Figure 2 Side view of the sand throwing arm in this embodiment;

[0025] Figure 3 One of the three-dimensional views of the sand throwing arm in this embodiment;

[0026] Figure 4 Another three-dimensional view of the sand throwing arm in this embodiment;

[0027] Figure 5 Schematic diagram of the operation of the sand throwing device in this embodiment.

[0028] Explanation of reference numerals:

[0029] 1. Sand thrower;

[0030] 2. Sand conveying pipe;

[0031] 3. Sand throwing arm;

[0032] 31. Base; 32. First-level arm; 33. Second-level arm;

[0033] 34. First driving mechanism;

[0034] 341. First linear motion member;

[0035] 342. First connecting rod; 3421. First connecting member; 3422. Second connecting member; 3423. Third connecting member; 3424. Fourth connecting member; 3425. Fifth connecting member;

[0036] 343. Second connecting rod; 3431. Sixth connecting member; 3432. Seventh connecting member; 3433. Eighth connecting member; 3434. Ninth connecting member; 3435. Tenth connecting member;

[0037] 344. First pin;

[0038] 35. Second driving mechanism;

[0039] 351. Second linear motion member;

[0040] 352. Third connecting rod; 3521. Eleventh connecting member; 3522. Twelfth connecting member; 3523. Thirteenth connecting member; 3524. Fourteenth connecting member; 3525. Fifteenth connecting member;

[0041] 353. Fourth connecting rod; 3531. Sixteenth connecting member; 3532. Seventeenth connecting member; 3533. Eighteenth connecting member; 3534. Nineteenth connecting member; 3535. Twentieth connecting member;

[0042] 354. Second pin;

[0043] 4. Chassis;

[0044] 5. Engine Detailed Implementation Modes

[0045] To illustrate in detail the possible application scenarios, technical principles, specific implementable solutions, achievable objectives and effects of this application, etc., the following will be described in detail in combination with the listed specific embodiments and with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application, so they are only examples and cannot be used to limit the protection scope of this application.

[0046] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The term "embodiment" appearing in various positions 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 technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0047] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of relevant terms herein is only to describe specific embodiments and is not intended to limit this application.

[0048] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this article generally represents an "or" logical relationship between the associated objects before and after.

[0049] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary or secondary, or order relationship between these entities or operations.

[0050] Without more limitations, in this application, the expressions such as "including", "comprising", "having" or other similar expressions used in the statements are intended to cover non-exclusive inclusion. These expressions do not exclude that there may be other elements in the process, method or product including the said elements, so that the process, method or product including a series of elements may not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to this process, method or product.

[0051] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding" are understood as not including the number itself; expressions such as "above", "below", "within" are understood as including the number itself. In addition, in the description of the embodiments of this application, the meaning of "multiple" is two or more (including two), and similar expressions related to "many" are understood in the same way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically defined.

[0052] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the specific embodiment or the drawings. It is only for the convenience of describing the specific embodiments of this application or for the reader to understand, rather than indicating or implying 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 construed as a limitation on the embodiments of this application.

[0053] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, the terms "installed", "connected", "connected", "fixed", "set", etc. should be understood in a broad sense. For example, the "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 directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two components or the interaction relationship between two components. For those skilled in the art to which this application belongs, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0054] Please refer to Figures 1 to 5 , this embodiment provides a sand throwing device, including a sand thrower 1, a sand conveying pipe 2 and a sand throwing arm 3. The sand thrower 1 is used to throw sand grains. The sand outlet of the sand thrower 1 is communicated with the sand inlet of the sand conveying pipe 2. The sand throwing arm 3 includes a base 31, a first-level arm 32, a second-level arm 33, a first driving mechanism 34 and a second driving mechanism 35. The base 31 is arranged on the sand thrower 1. The sand conveying pipe 2 is arranged on the first-level arm 32 and the second-level arm 33. The first-level arm 32 is rotatably arranged on the base 31. The first driving mechanism 34 is arranged on the base 31 and the first-level arm 32. The first driving mechanism 34 is used to drive the first-level arm 32 to rotate up and down relative to the base 31. The second-level arm 33 is rotatably arranged at one end of the first-level arm 32 away from the base 31. The second driving mechanism 35 is arranged on the first-level arm 32 and the second-level arm 33. The second driving mechanism 35 is used to drive the second-level arm 33 to rotate up and down relative to the first-level arm 32.

[0055] The first driving mechanism 34 causes the primary arm 32 to rotate up and down around the rotation point with the base 31, and the second driving mechanism 35 causes the secondary arm 33 to rotate up and down around the rotation point with the primary arm 32. This kind of rotation can not only help adjust the direction and angle of sand throwing to achieve precise sand throwing operation, but also improve the distance of sand throwing to a certain extent to adapt to different working environments and requirements.

[0056] Please refer to Figure 2 、 Figure 3 and Figure 4 In this embodiment, the first driving mechanism 34 includes a first link assembly and a first linear motion member 341. The first link assembly is respectively hinged to the base 31 and the primary arm 32, and the first link assembly is also connected to one end of the first linear motion member 341. The other end of the first linear motion member 341 is hinged to the base 31 or the primary arm 32. For example Figure 2 shows that the other end of the first linear motion member 341 is hinged to the base 31. And / or:

[0057] The second driving mechanism 35 includes a second link assembly and a second linear motion member 351. The second link assembly is respectively hinged to the primary arm 32 and the secondary arm 33, and the first link assembly is also connected to one end of the second linear motion member 351. The other end of the second linear motion member 351 is hinged to the primary arm 32 or the secondary arm 33. For example Figure 2 shows that the other end of the second linear motion member 351 is hinged to the primary arm 32.

[0058] The first linear motion member 341 and the second linear motion member 351 can be components such as hydraulic cylinders, air cylinders, and electric push rods that can be telescoped in a straight line direction. When the first linear motion member 341 moves, through the transmission of the first link assembly, the primary arm 32 can smoothly rotate up and down relative to the base 31. When the second linear motion member 351 moves, through the transmission of the second link assembly, the secondary arm 33 can smoothly rotate up and down relative to the primary arm 32. By combining the use of linear motion members and link assemblies, the device can achieve more delicate and precise angle adjustment, and can easily handle both large-range changes and small-range fine-tuning.

[0059] Please refer to Figure 2 、 Figure 3 and Figure 4, in this embodiment, the first link assembly includes link one 342 and link two 343. One end of link one 342 is hinged to the primary arm 32, the other end of link one 342 is hinged to one end of link two 343, and the other end of link two 343 is hinged to the base 31. Among them, the base 31, the primary arm 32, link one 342, and link two 343 form a four-bar linkage structure. When the first linear motion member 341 extends or contracts, it acts on link one 342 or link two 343, causing the first link assembly to perform amplitude variation. Due to the geometric relationship of the four-bar linkage structure, this length change will be converted into the rotational motion of the primary arm 32 relative to the base 31. The special geometric configuration of the four-bar linkage structure ensures the smoothness of the motion. At the same time, at different telescopic lengths, it can maintain the stability and predictability of the motion trajectory of the primary arm 32, thereby precisely controlling the direction and distance of sand throwing.

[0060] Please refer to Figure 2 , Figure 3 and Figure 4 , in this embodiment, the other end of link one 342 (away from the primary arm 32), one end of link two 343 (away from the base 31), and one end of the first linear motion member 341 are hinged together through the first pin 344. Figure 4 It is shown that the first pin 344 passes through the fourth connecting member 3424, the fifth connecting member 3425, the ninth connecting member 3434, and the tenth connecting member 3435. Such a way makes the structure more compact and reduces the redundant hinge points.

[0061] Please refer to Figure 2 , Figure 3 and Figure 4 , in this embodiment, link one 342 is a Y-shaped structure, and its wider end is hinged to the primary arm 32, and its narrower end is hinged to link two 343; and / or:

[0062] Link two 343 is a Y-shaped structure, and its wider end is hinged to the base 31, and its narrower end is hinged to link one 342.

[0063] The Y-shaped link provides a larger contact area and stronger support through its broad end, avoiding the overload problem of a single stress point and extending the service life of the link assembly and the entire sand throwing device. The Y-shaped structure of link one 342 increases the stability at the connection with the primary arm 32, while the Y-shaped structure of link two 343 enhances the connection effect with the base 31, ensuring the reliability and safety when the sand throwing arm 3 performs large-amplitude movements or bears large loads.

[0064] Please refer to Figure 2 , Figure 3 and Figure 4, in this embodiment, the connecting rod 342 of the Y-shaped structure includes a first connecting member 3421, a second connecting member 3422, a third connecting member 3423, a fourth connecting member 3424, and a fifth connecting member 3425. The first connecting member 3421 and the second connecting member 3422 are symmetrically arranged on the third connecting member 3423 and are located on the side of the third connecting member 3423 close to the first-stage arm 32. The first connecting member 3421 and the second connecting member 3422 are the wider ends of the Y-shaped structure. The fourth connecting member 3424 and the fifth connecting member 3425 are symmetrically arranged on the third connecting member 3423 and are located on the side of the third connecting member 3423 away from the first-stage arm 32. The fourth connecting member 3424 and the fifth connecting member 3425 are the narrower ends of the Y-shaped structure, that is, the distance between the fourth connecting member 3424 and the fifth connecting member 3425 is less than the distance between the first connecting member 3421 and the second connecting member 3422. And / or:

[0065] The structure of the connecting rod 343 is the same as that of the connecting rod 342, except that its position and function correspond to the base 31. The connecting rod 343 of the Y-shaped structure includes a sixth connecting member 3431, a seventh connecting member 3432, an eighth connecting member 3433, a ninth connecting member 3434, and a tenth connecting member 3435. The sixth connecting member 3431 and the seventh connecting member 3432 are symmetrically arranged on the eighth connecting member 3433 and are located on the side of the eighth connecting member 3433 close to the base 31. The sixth connecting member 3431 and the seventh connecting member 3432 are the wider ends of the Y-shaped structure. The ninth connecting member 3434 and the tenth connecting member 3435 are symmetrically arranged on the eighth connecting member 3433 and are located on the side of the eighth connecting member 3433 away from the base 31. The ninth connecting member 3434 and the tenth connecting member 3435 are the narrower ends of the Y-shaped structure, that is, the distance between the ninth connecting member 3434 and the tenth connecting member 3435 is less than the distance between the sixth connecting member 3431 and the seventh connecting member 3432.

[0066] The structure and dimensions of the first connecting member 3421 are the same as those of the second connecting member 3422, and the structure and dimensions of the fourth connecting member 3424 are the same as those of the fifth connecting member 3425. Figure 3 、 Figure 4 As shown, the third connecting member 3423 is rod-shaped, and the first connecting member 3421 and the second connecting member 3422 are plate-shaped. They are respectively sleeved on the left and right ends of the third connecting member 3423. The first connecting member 3421 and the second connecting member 3422 are also hinged to the two inner side walls of the first-stage arm 32. The fourth connecting member 3424 and the fifth connecting member 3425 are plate-shaped, and they are welded to the position near the middle of the third connecting member 3423.

[0067] The structure and dimensions of the sixth connecting member 3431 are the same as those of the seventh connecting member 3432, and the structure and dimensions of the ninth connecting member 3434 are the same as those of the tenth connecting member 3435. Figure 3 , Figure 4 As shown in Figure 4 , the eighth connecting member 3433 is rod-shaped, and the sixth connecting member 3431 and the seventh connecting member 3432 are plate-shaped. The sixth connecting member 3431 and the seventh connecting member 3432 are respectively sleeved on the left and right ends of the eighth connecting member 3433. The sixth connecting member 3431 and the seventh connecting member 3432 are also hinged to the two outer side walls of the base 31. The ninth connecting member 3434 and the tenth connecting member 3435 are plate-shaped, and the two are welded to the position near the middle of the eighth connecting member 3433.

[0068] The layout of the five connecting members forms a symmetric and stable Y-shaped structure. Taking the first connecting rod 342 as an example, the third connecting member 3423 serves as the central support point, which not only bears the important task of connecting other components, but also ensures the stability of the entire Y-shaped structure through its own strength and rigidity. The first connecting member 3421 and the second connecting member 3422 serve as the wide ends, increasing the contact area with the first-level arm 32 and improving the reliability of the connection. The fourth and fifth connecting members 3425 serve as the narrow ends, and through precise hinging, they cooperate efficiently with the second connecting rod 343 to achieve smooth transmission of force, and can also avoid stress concentration, thereby improving the overall motion stability and durability.

[0069] Please refer to Figure 2 , Figure 3 and Figure 4 , in this embodiment, the second connecting rod assembly includes a third connecting rod 352 and a fourth connecting rod 353. One end of the third connecting rod 352 is hinged to the second-level arm 33, the other end of the third connecting rod 352 is hinged to one end of the fourth connecting rod 353, and the other end of the fourth connecting rod 353 is hinged to the first-level arm 32. Among them, the first-level arm 32, the second-level arm 33, the third connecting rod 352, and the fourth connecting rod 353 form a four-bar linkage structure. When the second linear moving member 351 extends or contracts, it acts on the third connecting rod 352 or the fourth connecting rod 353, causing the second connecting rod assembly to perform amplitude variation. Due to the geometric relationship of the four-bar linkage structure, this length change will be converted into the rotational movement of the second-level arm 33 relative to the first-level arm 32. The special geometric configuration of the four-bar linkage structure ensures the smoothness of the movement, and at the same time, it can maintain the stability and predictability of the movement trajectory of the second-level arm 33 at different telescopic lengths, so as to accurately control the direction and distance of sand throwing.

[0070] In this embodiment, the other end of the third connecting rod 352 (away from the second-level arm 33), one end of the fourth connecting rod 353 (away from the first-level arm 32), and one end of the second linear moving member 351 are hinged together through a second pin 354. Figure 4It is shown that the second pin 354 passes through the fourteenth connecting member 3524, the fifteenth connecting member 3525, the nineteenth connecting member 3534, and the twentieth connecting member 3535. Such a form makes the structure more compact and reduces redundant hinge points.

[0071] Please refer to Figure 2 , Figure 3 and Figure 4 , in this embodiment, the link three 352 is a Y-shaped structure, and the wider end thereof is hinged to the secondary arm 33, and the narrower end thereof is hinged to the link four 353. And / or:

[0072] The link four 353 is a Y-shaped structure, and the wider end thereof is hinged to the primary arm 32, and the narrower end thereof is hinged to the link three 352.

[0073] The Y-shaped link provides a larger contact area and stronger support through its broad end, avoiding the overload problem of a single stress point and extending the service life of the link assembly and the entire sand throwing device. The Y-shaped structure of the link three 352 increases the stability at the connection with the secondary arm 33, while the Y-shaped structure of the link four 353 enhances the connection effect with the primary arm 32, ensuring the reliability and safety when the sand throwing arm 3 performs large-amplitude movements or bears large loads.

[0074] In this embodiment, the link three 352 with a Y-shaped structure includes an eleventh connecting member 3521, a twelfth connecting member 3522, a thirteenth connecting member 3523, a fourteenth connecting member 3524, and a fifteenth connecting member 3525. The eleventh connecting member 3521 and the twelfth connecting member 3522 are symmetrically arranged on the thirteenth connecting member 3523 and are located on the side of the thirteenth connecting member 3523 close to the secondary arm 33. The eleventh connecting member 3521 and the twelfth connecting member 3522 are the wider ends of the Y-shaped structure. The fourteenth connecting member 3524 and the fifteenth connecting member 3525 are symmetrically arranged on the thirteenth connecting member 3523 and are located on the side of the thirteenth connecting member 3523 away from the secondary arm 33. The fourteenth connecting member 3524 and the fifteenth connecting member 3525 are the narrower ends of the Y-shaped structure. And / or:

[0075] The structure of the fourth connecting rod 353 is the same as that of the third connecting rod 352, except that its position and function correspond to the base 31. The fourth connecting rod 353 with a Y-shaped structure includes a sixteenth connecting member 3531, a seventeenth connecting member 3532, an eighteenth connecting member 3533, a nineteenth connecting member 3534 and a twentieth connecting member 3535. The sixteenth connecting member 3531 and the seventeenth connecting member 3532 are symmetrically arranged on the eighteenth connecting member 3533 and are located on the side of the eighteenth connecting member 3533 close to the first-level arm 32. The sixteenth connecting member 3531 and the seventeenth connecting member 3532 are the wider ends of the Y-shaped structure. The nineteenth connecting member 3534 and the twentieth connecting member 3535 are symmetrically arranged on the eighteenth connecting member 3533 and are located on the side of the eighteenth connecting member 3533 away from the first-level arm 32. The nineteenth connecting member 3534 and the twentieth connecting member 3535 are the narrower ends of the Y-shaped structure.

[0076] The structure and dimensions of the eleventh connecting member 3521 are the same as those of the twelfth connecting member 3522, and the structure and dimensions of the fourteenth connecting member 3524 are the same as those of the fifteenth connecting member 3525. Figure 3 、 Figure 4 As shown, the thirteenth connecting member 3523 is rod-shaped, and the eleventh connecting member 3521 and the twelfth connecting member 3522 are plate-shaped. They are respectively sleeved on the left and right ends of the third connecting member 3423. The first connecting member 3421 and the second connecting member 3422 are also hinged to the two inner side walls of the second-level arm 33. The fourteenth connecting member 3524 and the fifteenth connecting member 3525 are plate-shaped, and they are welded to the position near the middle of the thirteenth connecting member 3523.

[0077] The structure and dimensions of the sixteenth connecting member 3531 are the same as those of the seventeenth connecting member 3532, and the structure and dimensions of the nineteenth connecting member 3534 are the same as those of the twentieth connecting member 3535. Figure 3 、 Figure 4 As shown, the eighteenth connecting member 3533 is rod-shaped, and the sixteenth connecting member 3531 and the seventeenth connecting member 3532 are plate-shaped. They are respectively sleeved on the left and right ends of the eighteenth connecting member 3533. The sixteenth connecting member 3531 and the seventeenth connecting member 3532 are also hinged to the two inner side walls of the first-level arm 32. The nineteenth connecting member 3534 and the twentieth connecting member 3535 are plate-shaped, and they are welded to the position near the middle of the eighteenth connecting member 3533.

[0078] Taking the connecting rod three 352 as an example, where the thirteenth connecting piece 3523 serves as the central support point, not only bearing the heavy responsibility of connecting other components, but also ensuring the stability of the entire Y-shaped structure through its own strength and rigidity. The eleventh connecting piece 3521 and the twelfth connecting piece 3522 serve as the wide ends, increasing the contact area with the secondary arm 33 and enhancing the reliability of the connection. While the fourteenth and fifteenth connecting pieces 3525 serve as the narrow ends, they cooperate efficiently with the connecting rod four 353 through precise articulation to achieve smooth force transmission and avoid stress concentration, thereby enhancing the overall motion stability and durability.

[0079] Please refer to Figure 1 , in this embodiment, the sand conveying pipe 2 is located inside the primary arm 32 and the secondary arm 33, and the first driving mechanism 34 is located outside the base 31 and the primary arm 32, preferably above. The second driving mechanism 35 is located outside the primary arm 32 and the secondary arm 33, preferably above, leaving the inner space for the sand conveying pipe 2. Optionally, the length of the primary arm 32 is similar to that of the secondary arm 33, and the primary arm 32 and the secondary arm 33 are inclined, such that the sand conveying pipe 2 is curved. The articulation point of the primary arm 32 and the secondary arm 33 corresponds to the middle region of the sand conveying pipe 2, and the structure is better.

[0080] Please refer to Figure 5 , Figure 5 shows the luffing trajectory of the sand throwing arm. The primary arm 32 can be deployed on the base 31, and the secondary arm 33 can be deployed on the primary arm 32, thereby adjusting the position of the sand outlet of the sand conveying pipe 2. The sand outlet of the sand conveying pipe 2 is located above, and the sand inlet is located below the sand outlet and is connected to the sand thrower 1.

[0081] Please refer to Figures 1 to 5 , this embodiment also provides a sand throwing fire truck, including a chassis 4 and a sand throwing device. The sand throwing device is provided on the chassis 4, and the sand throwing device is the sand throwing device described in any one of the above embodiments.

[0082] Please refer to Figure 1 , in this embodiment, the chassis 4 can be a wheeled chassis 4 or a tracked chassis 4. The wheeled chassis 4 provides fast and flexible road mobility and is suitable for quickly reaching the fire site on a straight line. While the tracked chassis 4 is good at off-road, especially when driving on soft ground, muddy ground, and irregular terrain, it can maintain stability.

[0083] Please refer to Figure 1 , in this embodiment, the sand throwing fire truck further includes a power device. The power device includes an engine 5 and a hydraulic system. The engine 5 is connected to the hydraulic oil pump of the hydraulic system through a transmission shaft. The hydraulic oil pump pumps the hydraulic oil in the hydraulic oil tank into the hydraulic circuit, enabling the hydraulic motor to drive the traveling mechanism of the chassis 4 to operate, and enabling the first linear motion member 341 / second linear motion member 351 in the form of an oil cylinder to operate.

[0084] It should be noted that although the above embodiments have been described in this text, the patent protection scope of the present utility model is not limited thereby. Therefore, based on the innovative concept of the present utility model, any changes and modifications made to the embodiments described in this text, or equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, and directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present utility model.

Claims

1. A sand throwing device, characterized in that, It includes a sand throwing machine, a sand conveying pipe and a sand throwing arm. The sand throwing machine is used to throw sand grains. The sand outlet of the sand throwing machine is communicated with the sand inlet of the sand conveying pipe. The sand throwing arm includes a base, a first-stage arm, a second-stage arm, a first driving mechanism and a second driving mechanism. The base is arranged on the sand throwing machine. The sand conveying pipe is arranged on the first-stage arm and the second-stage arm. The first-stage arm is rotatably arranged on the base. The first driving mechanism is arranged on the base and the first-stage arm. The first driving mechanism is used to drive the first-stage arm to rotate up and down relative to the base. The second-stage arm is rotatably arranged at one end of the first-stage arm away from the base. The second driving mechanism is arranged on the first-stage arm and the second-stage arm. The second driving mechanism is used to drive the second-stage arm to rotate up and down relative to the first-stage arm.

2. The sand throwing device according to claim 1, characterized in that The first driving mechanism includes a first connecting rod assembly and a first linear motion member. The first connecting rod assembly is respectively hinged to the base and the first-stage arm. The first connecting rod assembly is also connected to one end of the first linear motion member. The other end of the first linear motion member is hinged to the base or the first-stage arm; and / or: The second driving mechanism includes a second connecting rod assembly and a second linear motion member. The second connecting rod assembly is respectively hinged to the first-stage arm and the second-stage arm. The first connecting rod assembly is also connected to one end of the second linear motion member. The other end of the second linear motion member is hinged to the first-stage arm or the second-stage arm.

3. The sand throwing device according to claim 2, characterized in that, The first connecting rod assembly includes a first connecting rod and a second connecting rod. One end of the first connecting rod is hinged to the first-stage arm. The other end of the first connecting rod is hinged to one end of the second connecting rod. The other end of the second connecting rod is hinged to the base.

4. The sand throwing device according to claim 3, characterized in that, One end of the first connecting rod away from the first-stage arm, one end of the second connecting rod away from the base and one end of the first linear motion member are hinged together by a first pin.

5. The sand casting device according to claim 3 or 4, characterized in that, The first connecting rod is of a Y-shaped structure. The end with a larger width is hinged to the first-stage arm. The end with a smaller width is hinged to the second connecting rod; and / or: The second connecting rod is of a Y-shaped structure. The end with a larger width is hinged to the base. The end with a smaller width is hinged to the first connecting rod.

6. The sand throwing device according to claim 5, characterized in that, The Y-shaped first connecting rod includes a first connecting piece, a second connecting piece, a third connecting piece, a fourth connecting piece and a fifth connecting piece. The first connecting piece and the second connecting piece are symmetrically arranged on the third connecting piece and are located on the side of the third connecting piece close to the first-stage arm. The first connecting piece and the second connecting piece are the ends with a larger width of the Y-shaped structure. The fourth connecting piece and the fifth connecting piece are symmetrically arranged on the third connecting piece and are located on the side of the third connecting piece away from the first-stage arm. The fourth connecting piece and the fifth connecting piece are the ends with a smaller width of the Y-shaped structure; and / or: The second link of the Y-shaped structure includes a sixth connecting member, a seventh connecting member, an eighth connecting member, a ninth connecting member, and a tenth connecting member. The sixth connecting member and the seventh connecting member are symmetrically arranged on the eighth connecting member and are located on the side of the eighth connecting member close to the base. The sixth connecting member and the seventh connecting member are the wider ends of the Y-shaped structure. The ninth connecting member and the tenth connecting member are symmetrically arranged on the eighth connecting member and are located on the side of the eighth connecting member away from the base. The ninth connecting member and the tenth connecting member are the narrower ends of the Y-shaped structure.

7. The sand throwing device according to claim 2, wherein, The second link assembly includes a link three and a link four. One end of the link three is hinged to the secondary arm, the other end of the link three is hinged to one end of the link four, and the other end of the link four is hinged to the primary arm.

8. The sand throwing device according to claim 7, characterized in that, One end of the link three away from the secondary arm, one end of the link four away from the primary arm, and one end of the second linear motion member are hinged together by a second pin.

9. The sand throwing device according to claim 8, characterized in that, The link three is of a Y-shaped structure, with its wider end hinged to the secondary arm and its narrower end hinged to the link four; and / or: The link four is of a Y-shaped structure, with its wider end hinged to the primary arm and its narrower end hinged to the link three.

10. The sand throwing device according to claim 9, characterized in that, The link three of the Y-shaped structure includes an eleventh connecting member, a twelfth connecting member, a thirteenth connecting member, a fourteenth connecting member, and a fifteenth connecting member. The eleventh connecting member and the twelfth connecting member are symmetrically arranged on the thirteenth connecting member and are located on the side of the thirteenth connecting member close to the secondary arm. The eleventh connecting member and the twelfth connecting member are the wider ends of the Y-shaped structure. The fourteenth connecting member and the fifteenth connecting member are symmetrically arranged on the thirteenth connecting member and are located on the side of the thirteenth connecting member away from the secondary arm. The fourteenth connecting member and the fifteenth connecting member are the narrower ends of the Y-shaped structure; and / or: The link four of the Y-shaped structure includes a sixteenth connecting member, a seventeenth connecting member, an eighteenth connecting member, a nineteenth connecting member, and a twentieth connecting member. The sixteenth connecting member and the seventeenth connecting member are symmetrically arranged on the eighteenth connecting member and are located on the side of the eighteenth connecting member close to the primary arm. The sixteenth connecting member and the seventeenth connecting member are the wider ends of the Y-shaped structure. The nineteenth connecting member and the twentieth connecting member are symmetrically arranged on the eighteenth connecting member and are located on the side of the eighteenth connecting member away from the primary arm. The nineteenth connecting member and the twentieth connecting member are the narrower ends of the Y-shaped structure.

11. A sand-throwing fire extinguishing vehicle, characterized in that, It includes a chassis and a sand throwing device. The sand throwing device is provided on the chassis, and the sand throwing device is the sand throwing device according to any one of claims 1 to 10.

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