Slewing device and fire fighting truck

Abstract

The utility model relates to the technical field of fire fighting equipment, and provides a slewer and a fire fighting truck, the slewer comprises a rotary valve body and a fixed sleeve, the rotary valve body comprises a first cavity, a first opening and a second opening, the first opening and the second opening are respectively communicated with the first cavity, the first opening is arranged on the side wall of the rotary valve body, and the second opening is arranged on the side wall of the fixed sleeve. The second opening is formed in at least one end of the rotary valve body; the rotary valve body is sleeved with the fixing sleeve, the fixing sleeve is in running fit with the rotary valve body, at least one of the fixing sleeve and the rotary valve body is provided with an annular groove, the annular groove is formed between the fixing sleeve and the rotary valve body and communicated with the first opening, and the side, away from the rotary valve body, of the fixing sleeve is provided with a third opening communicated with the annular groove. According to the rotating device, the fixing sleeve is sleeved outside the rotating valve body, and the annular groove is formed between the fixing sleeve and the rotating valve body, so that the problem of motion interference between an existing transmission pipeline and a rotating body can be solved when the rotating device rotates.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting equipment, in particular to a rotary device and a fire fighting truck. Background Art

[0002] With the development of fire truck technology, fire trucks need to be able to transmit various fire extinguishing agents, which poses a great challenge to the layout of the transmission pipeline between the vehicle body and the fire cannon. As an important connecting component between the fire cannon and the fire body, the slewing device plays an important role in the layout of the transmission pipeline. The existing slewing device generally includes a transmission pipeline and a slewing body sleeved on the outside of the transmission pipeline. However, since the slewing body needs to perform a slewing motion, in order to avoid motion interference between the transmission pipeline and the slewing body, the transmission pipeline can only pass through both ends of the slewing body, which greatly limits the design of the slewing device, requiring a larger installation space for the slewing device, which is not convenient for the assembly and use of the slewing device. Utility Model Content

[0003] The first aspect of the utility model provides a rotary device to solve the defect of motion interference between the transmission pipeline and the rotating body in the prior art. By arranging a fixed sleeve on the outside of the rotary valve body and opening an annular groove between the two, the problem of motion interference between the existing transmission pipeline and the rotating body can be solved.

[0004] A second aspect of the utility model provides a fire truck.

[0005] The first aspect of the utility model provides a rotary device, comprising:

[0006] A rotary valve body, comprising a first cavity, a first opening and a second opening, wherein the first opening and the second opening are respectively connected to the first cavity, the first opening is arranged on a side wall of the rotary valve body, and the second opening is arranged on at least one end of the rotary valve body;

[0007] A fixed sleeve is sleeved on the rotary valve body and rotatably cooperates with the rotary valve body. An annular groove is provided on at least one of the fixed sleeve and the rotary valve body. The annular groove is provided between the fixed sleeve and the rotary valve body. The annular groove is communicated with the first opening. A third opening communicated with the annular groove is provided on the side of the fixed sleeve facing away from the rotary valve body.

[0008] According to the rotary device provided by the utility model, the rotary valve body further includes a second cavity, the second cavity and the first cavity are arranged in parallel with each other along the width direction of the rotary valve body, and the second cavity runs through both ends of the rotary valve body.

[0009] According to the rotary device provided by the utility model, at least two first cavities are provided, and the first cavities are arranged at intervals around the axis of the second cavity.

[0010] The rotary device provided by the utility model further includes an inner delivery pipe, which is arranged in the second cavity and fixedly connected to the rotary valve body.

[0011] According to the rotary device provided by the utility model, it also includes a clamping ring and a flange. The clamping ring is arranged at the lower end of the inner conveying pipe, and the flange is connected to the clamping ring. The clamping ring and the flange are used to limit the axial movement of the inner conveying pipe.

[0012] According to the rotary device provided by the utility model, it also includes an external input pipe and an external output pipe, the external input pipe is communicated with the third opening, and the external output pipe is communicated with the second opening.

[0013] According to the rotary device provided by the utility model, when the second opening is provided at the upper end of the rotary valve body, the rotary device further comprises a fixing member fixed to the upper end of the rotary valve body;

[0014] The fixing member includes a first pipe interface and a second pipe interface, the external output pipe is connected to the second opening through the first pipe interface and is fixedly connected to the fixing member; the internal delivery pipe passes through the second cavity and the second pipe interface in sequence from bottom to top and is fixedly connected to the fixing member.

[0015] According to the rotary device provided by the utility model, the fixing sleeve comprises a body and an extension portion, the extension portion is arranged above the body, and the annular groove is arranged on a side of the body facing the rotary valve body.

[0016] According to the rotary device provided by the utility model, the rotary valve body further includes a connecting portion, and the connecting portion is arranged at the upper end of the rotary valve body.

[0017] A second aspect of the utility model provides a fire truck, comprising a vehicle body and a slewing device as described in any one of the aforementioned embodiments, wherein the slewing device is arranged on the vehicle body.

[0018] The rotary device provided by the embodiment of the utility model is provided with an annular groove on at least one of the fixed sleeve and the rotary valve body, so that the first opening on the rotary valve body and the third opening on the fixed sleeve can be connected through the annular groove, thereby realizing the connection between the second opening on the rotary valve body and the third opening on the fixed sleeve; when the rotary valve body rotates relative to the fixed sleeve, the annular groove can continuously maintain the connection between the second opening and the third opening, thereby solving the interference problem between the design position of the third opening and the rotary motion of the rotary valve body.

[0019] Compared with the prior art, the rotary device provided in the embodiment of the utility model can make the third opening connected to the external delivery pipe relatively arranged on the side of the rotary device by arranging a fixed sleeve on the outside of the rotary valve body and opening an annular groove between the two. This can solve the problem of motion interference between the existing transmission pipeline and the rotating body when the rotary device performs a rotational motion, break the design limitation that the transmission pipeline can only pass through the two ends of the rotating body, reduce the installation space of the rotary device, and facilitate the assembly and use of the rotary device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the shaft side structure of the rotary device provided in an embodiment of the utility model;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of a rotary device provided in an embodiment of the utility model;

[0023] Figure 3 is a schematic cross-sectional structure diagram of the rotary device provided by the embodiment of the utility model at another viewing angle;

[0024] Figure 4 It is a schematic cross-sectional structure diagram of the rotary device provided by an embodiment of the utility model at another viewing angle.

[0025] Reference numerals:

[0026] 100: rotary valve body; 110: first cavity; 120: first opening; 130: second opening; 140: second cavity; 150: connecting portion; 200: fixing sleeve; 210: main body; 211: annular groove; 212: third opening; 220: extension portion; 300: clamping ring; 400: inner delivery pipe; 500: outer input pipe; 600: outer output pipe; 700: fixing member. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] Figure 1 It is a schematic diagram of the shaft side structure of the rotary device provided in an embodiment of the utility model; Figure 2 It is a schematic diagram of the cross-sectional structure of the rotary device provided in an embodiment of the utility model.

[0032] The first aspect of the utility model provides a rotary device, referring to Figure 1 The rotary device includes a rotary valve body 100 and a fixed sleeve 200. The fixed sleeve 200 is sleeved on the outer side of the rotary valve body 100. The rotary valve body 100 can rotate relative to the fixed sleeve 200.

[0033] The rotary valve body 100 is provided with a first cavity 110 inside, and the first cavity 110 extends along the length direction of the rotary valve body 100. The side wall of the rotary valve body 100 is provided with a first opening 120, and the first opening 120 is communicated with the first cavity 110. The upper end of the rotary valve body 100 is provided with a second opening 130 corresponding to the first opening 120, and the second opening 130 is also communicated with the first cavity 110. In other words, the first opening 120 and the second opening 130 are respectively provided at both ends of the first cavity 110. In an optional embodiment of the utility model, the number of the first cavity 110 can be set to one or more, and the participation Figure 1 and Figure 2 In the embodiment of the utility model, two first cavities 110 and two first openings 120 and two second openings 130 corresponding to the two first cavities 110 are taken as examples for illustration and description.

[0034] Specifically, the first cavity 110 is L-shaped, with the horizontal side facing the outside of the rotary valve body 100. Figure 2 As shown in the figure, the two first cavities 110 are symmetrically distributed along the axis of the rotary valve body 100. In some optional examples, the two first cavities 110 may not be symmetrically distributed along the axis of the rotary valve body 100. For example, the two first cavities 110 are arranged on the same side of the rotary valve body 100. In the case of providing multiple first cavities 110, the first cavities 110 may be arranged around the axis of the rotary valve body 100, and may be arranged at uniform intervals or at uneven intervals. Specifically, it can be adaptively selected according to actual conditions.

[0035] In an optional embodiment of the present invention, different from the above-mentioned embodiment, the second opening 130 can also be arranged at the lower end of the rotary valve body 100, see Figure 2 , that is, the long side of the "L"-shaped first cavity 110 shown in this embodiment is turned downward. In this case, the external pipe can be connected to the rotary valve body 100 from bottom to top, which can be adaptively set according to actual conditions. In other embodiments of the utility model, the upper and lower ends of the rotary valve body 100 can be provided with a second opening 130. In this case, the first cavity 110 is a "T" shape rotated 90° clockwise, that is, one first opening 120 corresponds to two second openings 130, which can be adaptively selected according to actual conditions.

[0036] Figure 3 is a schematic cross-sectional structure diagram of the rotary device provided by the embodiment of the utility model at another viewing angle; Figure 4 It is a schematic cross-sectional structure diagram of the rotary device provided by an embodiment of the utility model at another viewing angle.

[0037] See also Figure 2 , Figure 3 and Figure 4In an optional embodiment of the utility model, an annular groove 211 is provided on the side of the fixing sleeve 200 facing the rotary valve body 100, and the annular groove 211 is formed by a depression on the inner wall surface of the fixing sleeve 200. The annular groove 211 is communicated with the first opening 120. A third opening 212 is provided on the side of the fixing sleeve 200 facing away from the rotary valve body 100, and the third opening 212 is also communicated with the annular groove 211, that is, the first opening 120 can be communicated with the third opening 212 through the annular groove 211.

[0038] In an optional embodiment of the utility model, different from the above-mentioned embodiment, an annular groove 211 is provided on the side of the rotary valve body 100 facing the fixed sleeve 200, that is, an annular groove 211 is provided on the outer wall of the rotary valve body 100, and the annular groove 211 is formed by a depression on the outer wall surface of the rotary valve body 100. Similar to the above-mentioned embodiment, the annular groove 211 is connected to the first opening 120, and a third opening 212 is provided on the side of the fixed sleeve 200 facing away from the rotary valve body 100, and the third opening 212 is also connected to the annular groove 211, that is, the first opening 120 can be connected to the third opening 212 through the annular groove 211.

[0039] In some other optional embodiments of the utility model, different from the aforementioned embodiments, an annular groove 211 can be provided on the rotary valve body 100 and the fixed sleeve 200 at the same time, that is, an annular groove 211 is provided on the side of the rotary valve body 100 facing the fixed sleeve 200, and an annular groove 211 is also provided on the side of the fixed sleeve 200 facing the rotary valve body 100. The annular groove 211 on the rotary valve body 100 corresponds to the position of the annular groove 211 on the fixed sleeve 200. In other words, the annular groove 211 on the rotary valve body 100 and the annular groove 211 on the fixed sleeve 200 are connected to each other, and the two can jointly enclose an annular rotary chamber, which is connected to the first opening 120. At the same time, a third opening 212 connected to the annular rotary chamber is provided on the side of the fixed sleeve 200 facing away from the rotary valve body 100.

[0040] It should be noted that the annular groove 211 on the rotary valve body 100 and the annular groove 211 on the fixed sleeve 200 can have different widths. For example, the annular groove 211 on the rotary valve body 100 is set wider, or the annular groove 211 on the fixed sleeve 200 is set wider. Specifically, it can be adaptively set according to actual needs.

[0041] See also Figures 2 to 4It can be understood that the rotary device provided by the embodiment of the utility model is provided with an annular groove 211 on at least one of the fixed sleeve 200 and the rotary valve body 100. In this way, the first opening 120 on the rotary valve body 100 and the third opening 212 on the fixed sleeve 200 can be connected through the annular groove 211, thereby realizing the connection between the second opening 130 on the rotary valve body 100 and the third opening 212 on the fixed sleeve 200. When the rotary valve body 100 rotates relative to the fixed sleeve 200, the annular groove 211 can continuously maintain the connection between the second opening 130 and the third opening 212, thereby solving the interference problem between the design position of the third opening 212 and the rotary motion of the rotary valve body 100.

[0042] Compared with the prior art, the rotary device provided in the embodiment of the utility model can make the third opening 212 connected to the external delivery pipe relatively arranged on the side of the rotary device by sleeve-mounting the fixing sleeve 200 on the outside of the rotary valve body 100 and opening the annular groove 211 between the two. This can solve the problem of motion interference between the existing transmission pipeline and the rotating body when the rotary device performs a rotational motion, break the design limitation that the transmission pipeline can only pass through the two ends of the rotating body, reduce the installation space of the rotary device, and facilitate the assembly and use of the rotary device.

[0043] Continue reading Figures 2 to 4 In an optional embodiment of the utility model, the rotary valve body 100 further includes a second cavity 140. The second cavity 140 and the first cavity 110 are arranged in parallel with each other along the length direction of the rotary valve body 100. The second cavity 140 runs through the rotary valve body 100. In other words, openings communicating with the second cavity 140 are arranged on the upper and lower end surfaces of the rotary valve body 100. The number of the second cavities 140 can be one or more. Specifically, it can be adaptively selected according to actual conditions.

[0044] It can be understood that a second cavity 140 is provided which is separated from the first cavity 110, so that different media can be transmitted through the first cavity 110 and the second cavity 140 respectively. In the process of firefighting and disaster relief, the fire truck can transport a variety of different fire extinguishing agents at the same time, so that the rotary device can have the function of supplying multiple fire extinguishing agents. The multiple fire extinguishing agent supply function refers to the function of simultaneously supplying liquid (foam) and powder for firefighting, so as to improve the efficiency of firefighting and expand the use scenarios. For example, a foam-water mixture is transported through the first cavity 110, and dry powder is transported through the second cavity 140. Or dry powder is transported through the first cavity 110, and a foam-water mixture is transported through the second cavity 140. Of course, the medium that can be transmitted by the first cavity 110 and the second cavity 140 is not limited to this, and can also be water, carbon dioxide or halogenated hydrocarbons, etc. The selection of the specific fire extinguishing medium can be adaptively matched according to the actual situation, and the embodiment of the utility model does not limit this. It can be understood that the rotating device provided in the embodiment of the utility model, after solving the problem of motion interference between the existing transmission pipeline and the rotating body, enables the rotating device to have the function of supplying multiple fire-fighting agents, which can further improve the functionality and versatility of the rotating device and enable it to be used in more different working environments.

[0045] Continue reading Figure 2 In an optional embodiment of the utility model, when a plurality of first cavities 110 are provided, the first cavities 110 are spaced apart around the axis of the second cavity 140, that is, the second cavity 140 is coaxially arranged with the rotary valve body 100. It can be understood that by arranging the first cavity 110 around the second cavity 140, it is possible to avoid positional interference between the first cavity 110 and the second cavity 140 while ensuring that the first cavity 110 is connected to the annular groove 211, thereby ensuring a reasonable layout of the first cavity 110 and the second cavity 140; in addition, by providing a plurality of first cavities 110, it is possible to improve the ability of the first cavity 110 to transport the medium, thereby improving the versatility and practicality of the overall rotary device.

[0046] Continue reading Figures 1 to 4 In an optional embodiment of the utility model, the rotary device also includes an inner delivery pipe 400, which is arranged in the second cavity 140 and fixedly connected to the rotary valve body 100. In other words, the second cavity 140 is a mounting portion of the inner delivery pipe 400, which is used for the rotary valve body 100 to install the inner delivery pipe 400. The upper and lower ends of the inner delivery pipe 400 respectively pass through the second cavity 140 to facilitate connection with an external delivery pipeline. It can be understood that by providing the inner delivery pipe 400, the connection of the external delivery pipeline can be facilitated, and the maintenance and assembly of the rotary valve body 100 and the inner delivery pipe 400 can be facilitated.

[0047] In an optional embodiment of the utility model, different from the aforementioned embodiment, pipe joints can be provided at both ends of the second cavity 140, and the second cavity 140 and the pipe joints at its upper and lower ends can be spliced ​​into the aforementioned "inner conveying pipe 400" to achieve the purpose of conveying the medium. Specifically, it can be adaptively arranged according to actual conditions.

[0048] Continue reading Figures 1 to 4 In an optional embodiment of the utility model, the rotating device also includes a clamping ring 300 and a flange. The clamping ring 300 is arranged at the lower end of the inner delivery pipe 400, the flange is connected to the clamping ring 300, and the flange is rotatably connected to the vehicle body. The flange and the clamping ring 300 can rotate with the inner delivery pipe 400. It can be understood that the clamping ring 300 and the flange can limit the axial movement of the inner delivery pipe 400 to ensure its stability.

[0049] Continue reading Figures 1 to 4 In an optional embodiment of the present invention, the rotary device further comprises an external input pipe 500 and an external output pipe 600. The external input pipe 500 is disposed at the third opening 212 and communicates with the third opening 212. The external output pipe 600 is disposed at the second opening 130 and communicates with the second opening 130. The external input pipe 500 and the external output pipe 600 can be easily connected to the external pipeline. In an optional embodiment of the present invention, refer to Figure 2 In the case of setting at least two first cavities 110, a plurality of external output pipes 600 corresponding to the first cavities 110 can be connected to a general pipeline to facilitate connection with the external pipeline. Specifically, it can be adaptively set according to actual conditions. It should be noted that in this case, by limiting the axial movement of the inner delivery pipe 400 through the aforementioned flange and the clamping ring 300, the positional interference between the inner delivery pipe 400 and the external output pipe 600 can be avoided, and the overall structure of the rotary device can be made more reasonable.

[0050] Continue reading Figures 1 to 4 In an optional embodiment of the utility model, when the second opening 130 is provided at the upper end of the rotary valve body 100, the rotary device further comprises a fixing member 700, which is fixed to the upper end of the rotary valve body 100; the fixing member 700 comprises a first pipe interface and a second pipe interface, the external output pipe 600 is communicated with the second opening 130 through the first pipe interface, and is fixedly connected to the fixing member 700; the internal delivery pipe 400 passes through the second cavity 140 and the second pipe interface in sequence from bottom to top, and is fixedly connected to the fixing member 700. It can be understood that by providing the fixing member 700, the fixed connection between the internal delivery pipe 400 and the external output pipe 600 and the rotary valve body 100 can be facilitated, so as to realize the synchronous rotation between the internal delivery pipe 400 and the external output pipe 600 and the rotary valve body 100, and the production and overall assembly of the rotary device can be facilitated.

[0051] Continue reading Figures 1 to 4 In an optional embodiment of the utility model, the fixing sleeve 200 includes a body 210 and an extension portion 220, the extension portion 220 is arranged above the body 210, and the annular groove 211 is arranged on the side of the body 210 facing the rotary valve body 100. It can be understood that the extension portion 220 can increase the contact area between the rotary valve body 100 and the fixing sleeve 200, so that the stress between the rotary valve body 100 and the fixing sleeve 200 is dispersed, and when the rotary valve body 100 rotates relative to the fixing sleeve 200, the overall stability of the rotary device can be improved.

[0052] Continue reading Figures 1 to 4 In an optional embodiment of the present invention, the rotary valve body 100 further includes a connecting portion 150, which is disposed at the upper end of the rotary valve body 100. The connecting portion 150 can expand the upper end surface of the rotary valve body 100, facilitating the connection between the rotary valve body 100 and other devices. In addition, in an optional embodiment of the present invention, a sealing ring is further included, which is disposed at the connection between each pipeline and the rotary device, and between the rotary valve body 100 and the fixed sleeve 200. By providing the sealing rings, the sealing performance of the rotary device as a whole can be improved to avoid leakage.

[0053] The second aspect of the utility model provides a fire truck, which includes a vehicle body and a slewing device of any one of the aforementioned embodiments, and the slewing device is arranged on the vehicle body. Specifically, a turntable fixing frame is arranged on the vehicle body, and a fixing sleeve 200 is fixedly connected to the turntable fixing frame. The driving member on the vehicle body can be connected to the rotary valve body through a connecting portion 150 to drive the rotary valve body to rotate relative to the fixing sleeve 200. A powder spray cabin, a tank body and a fire monitor are also arranged on the vehicle body. In a specific embodiment, the external input pipe 500 can be connected to the tank body, and the external output pipe 600 can be connected to the fire monitor. The internal delivery pipe 400 can be used to connect the powder spray cabin and the fire monitor. In this way, the foam water mixture can be supplied to the fire monitor through the tank body, and the dry powder can be supplied to the fire monitor through the powder spray cabin, so that the required fire extinguishing agent is provided to the fire monitor with a multi-fire fighting agent supply function at the same time, so as to achieve rapid fire extinguishing.

[0054] It should be noted that the technical solutions in various embodiments of the present utility model can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present utility model.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A rotary device, characterized in that: include: A rotary valve body, comprising a first cavity, a first opening and a second opening, wherein the first opening and the second opening are respectively connected to the first cavity, the first opening is arranged on a side wall of the rotary valve body, and the second opening is arranged on at least one end of the rotary valve body; A fixed sleeve is sleeved on the rotary valve body and rotatably cooperates with the rotary valve body. An annular groove is provided on at least one of the fixed sleeve and the rotary valve body. The annular groove is provided between the fixed sleeve and the rotary valve body. The annular groove is communicated with the first opening. A third opening communicated with the annular groove is provided on the side of the fixed sleeve facing away from the rotary valve body.

2. The rotary device according to claim 1, characterized in that: The rotary valve body further includes a second cavity, which is arranged in parallel with the first cavity at an interval along the width direction of the rotary valve body, and the second cavity runs through both ends of the rotary valve body.

3. The rotary device according to claim 2, characterized in that: There are at least two first cavities, and the first cavities are arranged at intervals around the axis of the second cavity.

4. The rotary device according to claim 2, characterized in that: It also includes an inner delivery pipe, which is arranged in the second cavity and fixedly connected to the rotary valve body.

5. The rotary device according to claim 4, characterized in that: It also includes a clamping ring and a flange. The clamping ring is arranged at the lower end of the inner delivery pipe. The flange is connected to the clamping ring. The clamping ring and the flange are used to limit the axial movement of the inner delivery pipe.

6. The rotary device according to claim 4, characterized in that: It also includes an external input pipe and an external output pipe, wherein the external input pipe is communicated with the third opening, and the external output pipe is communicated with the second opening.

7. The rotary device according to claim 6, characterized in that: In the case where the second opening is provided at the upper end of the rotary valve body, the rotary device further comprises a fixing member fixed to the upper end of the rotary valve body; The fixing member includes a first pipe interface and a second pipe interface, the external output pipe is connected to the second opening through the first pipe interface and is fixedly connected to the fixing member; the internal delivery pipe passes through the second cavity and the second pipe interface in sequence from bottom to top and is fixedly connected to the fixing member.

8. The rotary device according to any one of claims 1 to 7, characterized in that: The fixing sleeve comprises a main body and an extension portion, wherein the extension portion is arranged above the main body, and the annular groove is arranged on a side of the main body facing the rotary valve body.

9. The rotary device according to any one of claims 1 to 7, characterized in that: The rotary valve body further includes a connecting portion, and the connecting portion is arranged at the upper end of the rotary valve body.

10. A fire truck, characterized in that: It comprises a vehicle body and a slewing device as claimed in any one of claims 1 to 9, wherein the slewing device is arranged on the vehicle body.

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