Fire fighting truck and its slewing device

Abstract

The utility model discloses a fire engine and rotary device thereof, wherein the rotary device comprises: rotary bearing, support cylinder, base and first sealing assembly, the rotary bearing has rotary part, the support cylinder is established on the rotary part through support platform, and the rotary cylinder is rotated along with the rotation of the rotary part, and the bottom of support cylinder is equipped with water inlet, the base is equipped with water delivery cavity, the lateral wall of base is equipped with the water inlet that communicates with water delivery cavity, the top of base is equipped with the water outlet that communicates with water delivery cavity, and the water outlet of base communicates with the water inlet of support cylinder, and the top of base supports rotary bearing, the first sealing assembly comprises first rotary seal ring, and first rotary seal ring is arranged between the water outlet of base and the water inlet of support cylinder, and is used for sealing the gap between the water outlet of base and the water inlet of support cylinder. First rotary seal ring allows relative rotation while keeping sealing, and ensures that water flow does not leak in the continuous rotation process. Such structure makes the overall pressure resistance, durability stronger.

Description

Technical Field

[0001] This utility model relates to the field of emergency rescue, and in particular to a fire truck and its rotating device. Background Technology

[0002] A fire truck is a specialized vehicle designed for firefighting, rescue, and emergency response. In existing technology, fire trucks are typically equipped with a slewing mechanism and a fire boom mounted on it. This fire boom has a pitching function, and the slewing mechanism drives the boom to rotate horizontally on the vehicle chassis to expand the operational coverage area. To ensure a continuous water supply during firefighting operations, the fire boom's inlet is usually connected to the outlet of the vehicle's water tank or pump via a flexible hose, thereby delivering high-pressure water to the spray device at the end of the boom. This solution is simple in structure and maintains the continuity of the water supply path during boom rotation, pitching, and extension movements, possessing a certain degree of adaptability. However, in actual use, the hose is subjected to complex dynamic loads over a long period, including repeated bending, torsion, and vibration impacts, which can easily lead to fatigue damage and leakage.

[0003] Therefore, there is a need for an alternative structure that can improve the reliability of water supply by avoiding reliance on easily damaged flexible hoses for direct connection while ensuring continuous fluid delivery. Utility Model Content

[0004] Therefore, there is a need to provide a fire truck and its rotating device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the inventors provide a rotary device, comprising: a rotary bearing, a support cylinder, a base, and a first sealing assembly;

[0006] The slewing bearing has a slewing portion;

[0007] The support cylinder is mounted on the rotating part via a support platform and rotates along with the rotating part. The bottom of the support cylinder is provided with a water inlet.

[0008] The base has a water supply chamber inside, and the side wall of the base has a water inlet communicating with the water supply chamber. The top of the base has a water outlet communicating with the water supply chamber. The water outlet of the base is connected to the water inlet of the support cylinder. The top of the base supports the slewing bearing.

[0009] The first sealing assembly includes a first rotating sealing ring, which is disposed between the water outlet of the base and the water inlet of the support cylinder, for sealing the gap between the water outlet of the base and the water inlet of the support cylinder.

[0010] Furthermore: the first rotary sealing ring is a Glyd ring, which includes a wear ring and an O-ring, with the O-ring disposed on the outer circumferential surface of the wear ring;

[0011] The inlet of the support cylinder extends into the outlet of the base; the wear-resistant ring contacts the inner wall of the inlet of the support cylinder; and the O-ring contacts the outer wall of the outlet of the base; or...

[0012] The water inlet of the support cylinder is located outside the water outlet of the base, the wear-resistant ring contacts the outer wall of the water outlet of the base, and the O-ring contacts the inner wall of the water inlet of the support cylinder.

[0013] Further: The base includes a seat body and a mounting ring. The seat body is located below the mounting ring. The mounting ring is detachably disposed on the upper edge of the opening at the top of the seat body. The top opening of the seat body and the mounting ring form the water outlet of the base. The inner circumferential surface of the mounting ring is provided with a mounting groove. The O-ring is installed in the mounting groove. The wear-resistant ring is interference-fitted with the outer wall of the water inlet of the support cylinder.

[0014] Furthermore, the first sealing assembly also includes a second rotating sealing ring located below the first rotating sealing ring. The outer peripheral surface of the second rotating sealing ring is stepped. The inner sidewall of the outlet of the base is provided with a stepped groove adapted to the stepped shape. The inner peripheral surface of the second rotating sealing ring contacts the outer sidewall of the inlet of the support cylinder. The outer peripheral surface of the second rotating sealing ring contacts the stepped groove. The upper end surface of the second rotating sealing ring contacts the lower sidewall of the mounting ring to seal the gap between the lower sidewall of the mounting ring, the stepped groove, and the outer sidewall of the inlet of the support cylinder.

[0015] Furthermore: the second rotary seal ring is a plug seal.

[0016] Furthermore, the first sealing assembly also includes a second rotating sealing ring, which is disposed between the water outlet of the base and the water inlet of the support cylinder, and located above or below the first rotating sealing ring, for sealing the gap between the water outlet of the base and the water inlet of the support cylinder.

[0017] Furthermore, it also includes a second sealing assembly disposed between the top of the support platform and the bottom of the support cylinder, for sealing the gap between the top of the support platform and the bottom of the support cylinder.

[0018] Furthermore, the second sealing assembly includes a third rotary sealing ring and a fourth rotary sealing ring, both of which are disposed between the top of the support platform and the bottom of the support cylinder, with the third rotary sealing ring located inside the fourth rotary sealing ring.

[0019] Furthermore, it also includes a central rotary joint and a connector. The central rotary joint is located on the bottom of the base and extends through the base. The central rotary joint has a channel for external pipes to pass through. One end of the connector is located on the rotating part of the central rotary joint, and the other end of the connector passes through the water inlet of the support cylinder and is located inside the support cylinder. The side wall of the support cylinder has an opening for external pipes to pass through.

[0020] To achieve the above objectives, the inventors also provide a fire truck, comprising: a slewing device, a chassis, an upper water supply pipe, a fire monitor, a left water supply pipe, a right water supply pipe, and a lifting mechanism;

[0021] The rotary device is the rotary device described in any of the above embodiments, and the base of the rotary device is disposed on the chassis;

[0022] The support cylinder of the rotary device is located below the upper water supply pipe. The left outlet of the support cylinder of the rotary device is connected to the inlet of the left water supply pipe, the outlet of the left water supply pipe is connected to the left inlet of the upper water supply pipe, the right outlet of the support cylinder is connected to the inlet of the right water supply pipe, and the outlet of the right water supply pipe is connected to the right inlet of the upper water supply pipe.

[0023] The left inlet of the upper water pipe can rotate relative to the outlet of the left water pipe, and the right inlet of the upper water pipe can rotate relative to the outlet of the right water pipe; or, the inlet of the left water pipe can rotate relative to the left outlet of the support cylinder, and the inlet of the right water pipe can rotate relative to the right outlet of the support cylinder.

[0024] The fire monitor is connected to the outlet of the upper water supply pipe;

[0025] The lifting mechanism is located on the support platform of the rotary device, supports the upper water pipe, and is used to adjust the pitch of the upper water pipe.

[0026] Unlike existing technologies, the above technical solution has the following beneficial effects:

[0027] External water enters the water supply chamber inside the base through the inlet on the side wall of the base and is then conveyed upwards through the outlet at the top of the base. The water flows through the sealed area between the base outlet and the support cylinder inlet, enters the support cylinder, and is finally delivered to the fire boom connected to it. When the rotating part of the slewing bearing drives the support cylinder and the boom above it to rotate horizontally, the support cylinder rotates relative to the stationary base. At this time, the first rotary seal ring located between the fluid interfaces of the two allows relative rotation while maintaining a seal, ensuring that no leakage occurs during continuous rotation. This structure enhances overall pressure resistance and durability.

[0028] The above description of the utility model is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0029] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this utility model and other related contents, and should not be considered as limitations on this application.

[0030] Figure 1 A schematic diagram of the rotary device, upper water supply pipe, and lifting mechanism in the application;

[0031] Figure 2 This is a schematic diagram showing the positions of the water outlet of the base and the water inlet of the support cylinder for the rotary device in this application;

[0032] Figure 3 for Figure 2 Enlarged schematic diagram of part A in the middle;

[0033] Figure 4 for Figure 2 Enlarged diagram of part B in the middle;

[0034] Figure 5 This is a schematic diagram of the slewing bearing in this application;

[0035] Figure 6 This is a schematic diagram of the rotary device, upper water supply pipe, fire monitor, and lifting mechanism in this application from a first-view perspective;

[0036] Figure 7 The schematic diagram of the rotary device, upper water supply pipe, fire monitor, left water supply pipe, right water supply pipe and lifting mechanism in this application is a schematic diagram of a part of the second view.

[0037] Figure 8The schematic diagram of the rotating device, upper water supply pipe, fire monitor, left water supply pipe, right water supply pipe and lifting mechanism in this application is a schematic diagram of another part from a second perspective.

[0038] Figure 9 for Figure 7 Enlarged schematic diagram of part C in the middle;

[0039] Figure 10 for Figure 7 Enlarged schematic diagram of part D in the middle;

[0040] Figure 11 This is a schematic diagram of the fire truck in this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Support cylinder; 11. Left outlet; 12. Right outlet; 13. Opening; 14. Inlet; 15. Slot;

[0043] 2. Left water supply pipe;

[0044] 3. Right water supply pipe;

[0045] 4. Upper water supply pipe; 41. Outer pipe; 42. Inner pipe; 43. Left water inlet; 44. Right water inlet;

[0046] 5. Fire monitor;

[0047] 6. Lifting mechanism;

[0048] 7. Slewing bearing; 71. Rotating part; 72. Fixed part; 73. Support platform; 74. Slewing drive mechanism; 75. Bolt;

[0049] 8. First sealing assembly; 81. First rotary sealing ring; 811. Wear-resistant ring; 812. O-ring; 82. Second rotary sealing ring; 821. Stepped shape;

[0050] 9. Second sealing assembly; 91. Third rotary sealing ring; 92. Fourth rotary sealing ring;

[0051] 100. Base; 101. Seat body; 102. Mounting ring; 103. Stepped groove; 104. Mounting groove; 105. Water inlet; 106. Water outlet;

[0052] 110. Central rotary joint;

[0053] 120. Connecting parts;

[0054] 130. Chassis. Detailed Implementation

[0055] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0056] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0057] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0058] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0059] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0060] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0061] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0062] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0063] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0064] Please see Figures 1 to 11 This embodiment provides a rotary device, including: a rotary bearing 7, a support cylinder 1, a base 100, and a first sealing assembly 8;

[0065] The slewing bearing 7 has a rotating part 71;

[0066] The support cylinder 1 is mounted on the rotating part 71 via the support platform 73 and rotates along with the rotating part 71. The bottom of the support cylinder 1 is provided with a water inlet.

[0067] The base 100 has a water supply chamber inside, and the side wall of the base 100 has a water inlet 105 that communicates with the water supply chamber. The top of the base 100 has a water outlet 106 that communicates with the water supply chamber. The water outlet 106 of the base 100 is connected to the water inlet 14 of the support cylinder 1. The top of the base 100 supports the slewing bearing 7.

[0068] The first sealing assembly 8 includes a first rotating sealing ring 81, which is disposed between the water outlet 106 of the base 100 and the water inlet 14 of the support cylinder 1, and is used to seal the gap between the water outlet 106 of the base 100 and the water inlet 14 of the support cylinder 1.

[0069] It should be noted that the slewing bearing 7 can be a rolling element type slewing bearing, including a fixed part 72 and a rotating part 71 that can rotate relative to the fixed part 72. The fixed part 72 is supported on the base, and the rotating part 71 can be driven by a slewing drive mechanism 74 (such as a geared motor, hydraulic motor, etc.) to make the rotating part 71 rotate relative to the fixed part 72. In one embodiment, the fixed part 72 is the inner ring of the slewing bearing 7, the rotating part 71 is the outer ring of the slewing bearing 7 and the rolling element (such as a steel ball) disposed between the inner and outer rings, and the outer ring rotates together with the support cylinder 1. In another embodiment, the inner ring can also be used as the rotating part 71, that is, the inner ring rotates while the outer ring is fixed on the base 100 as the fixed part 72. The specific structure can be flexibly selected according to the actual installation requirements and transmission layout. This application does not limit the specific structural form of the slewing bearing 7, as long as it can realize the rotational movement of the support cylinder 1 relative to the base 100 and meet the functions of bearing and rotation.

[0070] It should be noted that the rotary sealing ring is a sealing element installed on the contact surface between the outlet 106 of the base 100 and the inlet of the support cylinder 1, which can maintain good sealing performance even when the two rotate relative to each other.

[0071] External water enters the water supply chamber inside the base 100 through the inlet 105 on the side wall of the base 100, and is then conveyed upwards through the outlet at the top of the base 100. The water flows through the sealed area between the outlet of the base 100 and the inlet of the support cylinder 1, enters the support cylinder 1, and is finally delivered to the fire boom connected to it. When the rotating part 71 of the slewing bearing 7 drives the support cylinder 1 and the boom above it to rotate horizontally, the support cylinder 1 rotates relative to the stationary base 100. At this time, the first rotary sealing ring 81, located between the fluid interfaces of the two, allows relative rotation while maintaining a seal, ensuring that no leakage occurs during continuous rotation. This structure enhances overall pressure resistance and durability.

[0072] Please see Figure 2 , Figure 3 , Figure 7 and Figure 9In some embodiments, the first rotary sealing ring 81 is a Glyd ring, which includes a wear ring 811 and an O-ring 812. The O-ring 812 is disposed on the outer circumferential surface of the wear ring 811. Generally speaking, the O-ring 812 is a rubber O-ring, which acts as an elastic support and applies radial preload to the wear ring 811. The wear ring 811 is a polytetrafluoroethylene ring, which can be disposed on the corresponding port by interference fit to withstand fluid pressure and relative rotational motion, that is, to achieve stable operation without leakage under high pressure water flow environment.

[0073] The Gladius ring is installed in the gap between the water outlet of the base 100 and the water inlet of the support cylinder 1. The installation can be done using one of the following two structures:

[0074] Please see Figure 3 and Figure 9 The first installation method is as follows: the outer diameter of the inlet 14 of the support cylinder 1 is smaller than the inner diameter of the outlet 106 of the base 100. The inlet 14 of the support cylinder 1 extends into the outlet 106 of the base 100. The wear-resistant ring 811 contacts the outer wall of the inlet 14 of the support cylinder 1, and the O-ring 812 contacts the inner wall of the outlet 106 of the base 100.

[0075] The second installation method: the inlet 14 of the support cylinder 1 is located outside the outlet 106 of the base 100, the outlet 106 of the base 100 extends into the inlet 14 of the support cylinder 1, the wear-resistant ring 811 contacts the outer wall of the outlet 106 of the base 100, and the O-ring 812 contacts the inner wall of the inlet 14 of the support cylinder 1.

[0076] In the second installation method, since the inlet 14 of the support cylinder 1 is fitted around the outlet of the base 100, water remaining inside the support cylinder 1 or above the interface will flow downwards under gravity and accumulate above the first sealing ring, exerting a downward pressure on the sealing ring. Preferably, the first installation method is adopted, that is, the inlet 14 of the support cylinder 1 extends downwards into the outlet 106 of the base 100, forming an internal insertion sealing fit structure, as shown in the figure. Figure 4 and Figure 9 As shown.

[0077] Please see Figure 2 , Figure 3 , Figure 7 and Figure 9Building upon the first installation method, the base 100 further includes a seat body 101 and a mounting ring 102. The seat body 101 is located below the mounting ring 102. The mounting ring 102 is detachably mounted on the upper edge of the opening at the top of the seat body 101. The top opening of the seat body 101 and the mounting ring 102 form the outlet 106 of the base 100. An mounting groove 104 is provided on the inner circumferential surface of the mounting ring 102. An O-ring 812 is installed in the mounting groove 104. A wear-resistant ring 811 is interference-fitted with the outer wall of the inlet 14 of the support cylinder 1. By placing the glyph on the detachable mounting ring 102, maintenance efficiency is greatly improved and maintenance costs are reduced.

[0078] It should be noted that the base 101 is the main body of the base 100, with an internal water supply chamber and an open structure at the top, meaning this end is open and not closed. The mounting ring 102 is a ring-shaped part that is detachably installed on the upper edge of the open top of the base 101. When the mounting ring 102 is assembled to the top of the base 101, it together with the open top of the base 101 encloses, connects, and extends a complete channel for fluid output. This channel, formed by the two, is the final defined outlet—the interface through which water flows from the water supply chamber of the base 100 into the upper support cylinder 1. In some embodiments, when the mounting ring 102 is not provided, the outlet 106 of the base 100 is directly formed by the open top of the base 101, and the inlet 14 of the support cylinder 1 connects to this opening to achieve fluid communication.

[0079] Please see Figure 2 , Figure 3 , Figure 7 and Figure 9 In some embodiments, the first sealing assembly 8 further includes a second rotary sealing ring 82. The second rotary sealing ring 82 is disposed between the water outlet 106 of the base 100 and the water inlet 14 of the support cylinder 1, and is located above or below the first rotary sealing ring 81, for sealing the gap between the water outlet 106 of the base 100 and the water inlet 14 of the support cylinder 1. The first rotary sealing ring 81 and the second rotary sealing ring 82 achieve a double seal, improving the reliability of the seal.

[0080] Please see Figure 3 and Figure 9Based on the first installation method, the outer circumferential surface of the second rotary sealing ring 82 is further shaped as a stepped shape 821. The inner sidewall of the outlet 106 of the base 100 is provided with a stepped groove 103 adapted to the stepped shape 821. The inner circumferential surface of the second rotary sealing ring 82 contacts the outer sidewall of the inlet 14 of the support cylinder 1, the outer circumferential surface of the second rotary sealing ring 82 contacts the stepped groove 103, and the upper end face of the second rotary sealing ring 82 contacts the lower sidewall of the mounting ring 102 to seal the gap between the lower sidewall of the mounting ring 102, the stepped groove 103, and the outer sidewall of the inlet 14 of the support cylinder 1. Through the limiting effect of the stepped groove 103 and the lower sidewall of the mounting ring 102, the second rotary sealing ring 82 is kept in a stable position. Although the second rotary sealing ring 82 is added, its installation position is still located in the area below the detachable mounting ring 102. When replacement is required, only the mounting ring 102 needs to be removed to inspect both sealing structures at the same time.

[0081] Please see Figure 3 and Figure 9 In some embodiments, the second rotary seal 82 is a plug seal. A plug seal includes a sealing body and a built-in elastic element (typically a helical spring or U-shaped spring). The sealing body is generally made of high-performance engineering plastics, possessing properties such as low friction, wear resistance, and corrosion resistance. The elastic element is embedded in the inner groove of the sealing body, providing continuous elastic restoring force.

[0082] In some other embodiments, the first rotary sealing ring 81 and the second rotary sealing ring 82 may be O-rings. However, compared with the solution of using Glyd rings or Pan-lock seals, the sealing performance of O-rings is relatively weak under high pressure and dynamic rotation conditions.

[0083] Please see Figure 2 and Figure 4 In some embodiments, the slewing device further includes a second sealing assembly 9, which is disposed between the top of the support platform 73 and the bottom of the support cylinder 1, for sealing the gap between the top of the support platform 73 and the bottom of the support cylinder 1. There is a certain assembly gap between the area where the top of the support platform 73 and the bottom of the support cylinder 1 meet. To prevent dust, rainwater, wash water, mud, or corrosive media from the external environment from entering the fluid sealing area below the slewing bearing 7 (such as the first sealing assembly 8) through this gap, the second sealing assembly 9 is provided to effectively seal this gap.

[0084] Please see Figure 4In some embodiments, the second sealing assembly 9 includes a third rotary sealing ring 91 and a fourth rotary sealing ring 92. Both the third rotary sealing ring 91 and the fourth rotary sealing ring 92 are disposed between the top of the support platform 73 and the bottom of the support cylinder 1, with the third rotary sealing ring 91 located inside the fourth rotary sealing ring 92. The third rotary sealing ring 91 and the fourth rotary sealing ring 92 are radially distributed, forming an inner and outer double-layer sealing barrier that jointly seals the gap between the support platform 73 and the support cylinder 1.

[0085] Please see Figure 1 and Figure 7 In some embodiments, the slewing device further includes a central slewing joint 110 and a connector 120. The central slewing joint 110 is located on the bottom of the base 100 and extends through the base 100. The central slewing joint 110 has a channel for external pipelines to pass through. One end of the connector 120 is located on the rotating part of the central slewing joint 110, and the other end of the connector 120 passes through the water inlet 14 of the support cylinder 1 and is located inside the support cylinder 1. The side wall of the support cylinder 1 has an opening 13 for external pipelines to pass through. These external pipelines pass through the channel of the central slewing joint 110 from below the base 100 and then extend to the outside through the opening 13 in the side wall of the support cylinder 1. These external pipelines may include hydraulic oil pipes, pneumatic pipes, cables, optical fibers, control harnesses, etc., for supplying power, air, or transmitting signals to the actuators on the slewing boom. The support cylinder 1 rotates horizontally relative to the base 100 along with the rotating part 71 of the slewing bearing 7, causing the connecting piece 120 to rotate synchronously, thereby driving the rotating part of the central slewing joint 110 to rotate, so that the external pipeline passing through it can rotate synchronously with the support cylinder 1.

[0086] Please see Figure 10 Preferably, the connector 120 is snapped into the support cylinder 1, and a slot 15 may be provided inside the support cylinder 1, through which the connector 120 passes from bottom to top and is snapped into place. Furthermore, there are multiple connectors 120, arranged in a ring.

[0087] Please see Figure 2 In some embodiments, the fixing part 72 is fixed to the top of the base 100 by bolts 75. This connection method has a simple structure, is easy to assemble and disassemble, and has good connection strength and reliability.

[0088] Please see Figures 1 to 11 This embodiment also provides a fire truck, including: a slewing device, a chassis 130, an upper water supply pipe 4, a fire monitor 5, a left water supply pipe 2, a right water supply pipe 3, and a lifting mechanism 6;

[0089] The rotary device is the rotary device of any of the above embodiments, and the base 100 of the rotary device is provided on the chassis 130;

[0090] The support cylinder 1 of the rotary device is located below the upper water supply pipe 4. The left outlet 11 of the support cylinder 1 of the rotary device is connected to the inlet of the left water supply pipe 2. The outlet of the left water supply pipe 2 is connected to the left inlet 43 of the upper water supply pipe 4. The right outlet 12 of the support cylinder 1 is connected to the inlet of the right water supply pipe 3. The outlet of the right water supply pipe 3 is connected to the right inlet 44 of the upper water supply pipe 4.

[0091] The left inlet 43 of the upper water pipe 4 can rotate relative to the outlet of the left water pipe 2, and the right inlet 44 of the upper water pipe 4 can rotate relative to the outlet of the right water pipe 3; or, the inlet of the left water pipe 2 can rotate relative to the left outlet 11 of the support cylinder 1, and the inlet of the right water pipe 3 can rotate relative to the right outlet 12 of the support cylinder 1.

[0092] The fire monitor 5 is connected to the outlet of the upper water supply pipe 4;

[0093] The lifting mechanism 6 is mounted on the support platform 73 of the slewing device, supports the upper water pipe 4, and is used to adjust the pitch of the upper water pipe 4.

[0094] The upper water supply pipe 4, fire monitor 5, left water supply pipe 2, right water supply pipe 3, and lifting mechanism 6 can form the fire boom described above. Figure 6 , Figure 7 , Figure 8 and Figure 11 .

[0095] The upper water supply pipe 4 is located at the top, while the left water supply pipe 2 and the right water supply pipe 3 are located in the middle, arranged symmetrically. The support cylinder 1 is located at the bottom. Water flows from an external water source into the inlet 14 of the support cylinder 1. Since the support cylinder 1 has two outlets, one flows out from the left outlet 11 of the support cylinder 1 and into the inlet of the left water supply pipe 2, and the other flows out from the right outlet 12 of the support cylinder 1 and into the inlet of the right water supply pipe 3. The water flows through the left water supply pipe 2 and the right water supply pipe 3 to the left inlet 43 and the right inlet 44 of the upper water supply pipe 4, respectively, and then merges into the interior of the upper water supply pipe 4. Finally, the water flows through the upper water supply pipe 4 to the fire monitor 5 at its far end for fire extinguishing operations.

[0096] The left water pipe 2 and the right water pipe 3 are symmetrically arranged on both sides (left and right sides) of the upper water pipe 4. This symmetrical double pipe structure evenly distributes the support force that might have been concentrated on one side to the left and right sides of the boom, resulting in higher support strength and reducing the probability of structural deformation.

[0097] It should be noted that, in one embodiment, the left inlet 43 of the upper water pipe 4 and the outlet of the left water pipe 2 are rotatably connected, allowing the upper water pipe 4 to rotate relative to the left water pipe 2 within a certain angle range; similarly, the right inlet 44 of the upper water pipe 4 and the outlet of the right water pipe 3 are also rotatably connected. The lifting mechanism 6 pushes the upper water pipe 4 to swing up and down around the axis of rotation formed by its rotatable connection with the left and right water pipes 3, thereby adjusting the spray angle of the fire monitor 5. In another embodiment, the inlet of the left water pipe 2 and the left outlet 11 of the support cylinder 1, and the inlet of the right water pipe 3 and the right outlet 12 of the support cylinder 1 are rotatably connected.

[0098] Please see Figure 6 , Figure 7 , Figure 8 and Figure 11 In some embodiments, the upper water supply pipe 4 is a multi-stage telescopic pipe. A multi-stage telescopic pipe is a component composed of multiple nested pipes, typically including an outer pipe 41 and an inner pipe 42. The aforementioned left inlet 43 and right inlet 44 are located at the end of the outer pipe 41 furthest from the inner pipe 42. Each pipe can slide and extend layer by layer to adapt to different operating height or distance requirements. For ease of description, this document only uses a two-stage structure including the outer pipe 41 and inner pipe 42 as an example, but this does not mean that the multi-stage telescopic pipe is limited to two stages. In fact, depending on the actual application scenario and performance requirements, this structure can be expanded into a three-stage, four-stage, five-stage, or even more-stage telescopic pipe, all of which fall within the protection scope and technical concept of this application.

[0099] Please see Figure 6 , Figure 7 and Figure 11 In some embodiments, the lifting mechanism 6 is typically a lifting telescopic rod, one end of which can be connected to the upper water supply pipe 4 (such as the outer pipe 41), and the other end is connected to the support platform 73, for adjusting the pitch of the upper water supply pipe 4 (such as the outer pipe 41).

[0100] Please see Figure 5 In some embodiments, the slewing part 71 (such as the outer ring) of the slewing bearing 7 is driven by a slewing drive mechanism 74 (such as a geared motor, hydraulic motor, etc.), which can drive the boom to rotate in the horizontal plane and achieve multi-directional operation coverage.

[0101] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A rotary device, characterized in that, include: Slewing bearing, support cylinder, base, and first sealing assembly; The slewing bearing has a slewing portion; The support cylinder is mounted on the rotating part via a support platform and rotates along with the rotating part. The bottom of the support cylinder is provided with a water inlet. The base has a water supply chamber inside, and the side wall of the base has a water inlet communicating with the water supply chamber. The top of the base has a water outlet communicating with the water supply chamber. The water outlet of the base is connected to the water inlet of the support cylinder. The top of the base supports the slewing bearing. The first sealing assembly includes a first rotating sealing ring, which is disposed between the water outlet of the base and the water inlet of the support cylinder, for sealing the gap between the water outlet of the base and the water inlet of the support cylinder.

2. The rotary device according to claim 1, characterized in that: The first rotary sealing ring is a Glyd ring, which includes a wear ring and an O-ring, with the O-ring disposed on the outer circumferential surface of the wear ring; The inlet of the support cylinder extends into the outlet of the base; the wear-resistant ring contacts the inner wall of the inlet of the support cylinder; and the O-ring contacts the outer wall of the outlet of the base; or... The water inlet of the support cylinder is located outside the water outlet of the base, the wear-resistant ring contacts the outer wall of the water outlet of the base, and the O-ring contacts the inner wall of the water inlet of the support cylinder.

3. The rotary device according to claim 2, characterized in that: The base includes a seat body and a mounting ring. The seat body is located below the mounting ring. The mounting ring is detachably mounted on the upper edge of the opening at the top of the seat body. The top opening of the seat body and the mounting ring form the water outlet of the base. The inner circumferential surface of the mounting ring is provided with a mounting groove. The O-ring is installed in the mounting groove. The wear-resistant ring is interference-fitted with the outer wall of the water inlet of the support cylinder.

4. The rotary device according to claim 3, characterized in that: The first sealing assembly further includes a second rotating sealing ring located below the first rotating sealing ring. The outer peripheral surface of the second rotating sealing ring is stepped. The inner sidewall of the outlet of the base is provided with a stepped groove adapted to the stepped shape. The inner peripheral surface of the second rotating sealing ring contacts the outer sidewall of the inlet of the support cylinder. The outer peripheral surface of the second rotating sealing ring contacts the stepped groove. The upper end surface of the second rotating sealing ring contacts the lower sidewall of the mounting ring to seal the gap between the lower sidewall of the mounting ring, the stepped groove, and the outer sidewall of the inlet of the support cylinder.

5. The rotary device according to claim 4, characterized in that: The second rotary sealing ring is a plug seal.

6. The rotary device according to claim 1 or 2, characterized in that: The first sealing assembly further includes a second rotating sealing ring, which is disposed between the water outlet of the base and the water inlet of the support cylinder, and is located above or below the first rotating sealing ring, for sealing the gap between the water outlet of the base and the water inlet of the support cylinder.

7. The rotary device according to claim 1, characterized in that: It also includes a second sealing assembly disposed between the top of the support platform and the bottom of the support cylinder, for sealing the gap between the top of the support platform and the bottom of the support cylinder.

8. The rotary device according to claim 7, characterized in that: The second sealing assembly includes a third rotary sealing ring and a fourth rotary sealing ring, both of which are disposed between the top of the support platform and the bottom of the support cylinder, with the third rotary sealing ring located inside the fourth rotary sealing ring.

9. The rotary device according to claim 1, characterized in that: It also includes a central rotary joint and a connector. The central rotary joint is located on the bottom of the base and extends through the base. The central rotary joint has a channel for external pipes to pass through. One end of the connector is located on the rotating part of the central rotary joint, and the other end of the connector passes through the water inlet of the support cylinder and is located inside the support cylinder. The side wall of the support cylinder has an opening for external pipes to pass through.

10. A fire truck, characterized in that, include: Rotary device, chassis, upper water supply pipe, fire monitor, left water supply pipe, right water supply pipe, and lifting mechanism; The rotary device is the rotary device according to any one of claims 1 to 9, and the base of the rotary device is disposed on the chassis; The support cylinder of the rotary device is located below the upper water supply pipe. The left outlet of the support cylinder of the rotary device is connected to the inlet of the left water supply pipe, the outlet of the left water supply pipe is connected to the left inlet of the upper water supply pipe, the right outlet of the support cylinder is connected to the inlet of the right water supply pipe, and the outlet of the right water supply pipe is connected to the right inlet of the upper water supply pipe. The left inlet of the upper water pipe can rotate relative to the outlet of the left water pipe, and the right inlet of the upper water pipe can rotate relative to the outlet of the right water pipe; or, the inlet of the left water pipe can rotate relative to the left outlet of the support cylinder, and the inlet of the right water pipe can rotate relative to the right outlet of the support cylinder. The fire monitor is connected to the outlet of the upper water supply pipe; The lifting mechanism is located on the support platform of the rotary device, supports the upper water pipe, and is used to adjust the pitch of the upper water pipe.

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