CN113877120B - Fluid conveying device's cantilever crane structure and fire engine - Google Patents

Abstract

The invention discloses an arm support structure of a fluid conveying device, wherein one end of a multi-stage telescopic arm is movably connected with a slewing mechanism; the first angle sensor and the second angle sensor are respectively arranged at two ends of the multi-stage telescopic arm; the winch is arranged at one end of the multi-stage telescopic arm close to the swing mechanism, and one end of the multi-stage telescopic arm far away from the swing mechanism is connected with the winch through a steel wire rope; when the multi-stage telescopic arm is extended, the first angle sensor and the second angle sensor detect the angle values of two ends of the multi-stage telescopic arm; the control unit calculates the difference between the two angle values and judges whether the difference between the two angle values is larger than a first preset angle value or not; if the difference between the two angle values is larger than the first preset angle value, the control unit drives the winch to tighten the steel wire rope. Through the arrangement of the steel wire winch structure, the control unit, the first angle sensor and the second angle sensor, one end of the multi-stage telescopic arm, which is far away from the swing mechanism, is prevented from bending downwards when the multi-stage telescopic arm extends outwards; and simultaneously, the lifting height of the multi-stage telescopic arm is improved.

Description

Fluid conveying device's cantilever crane structure and fire engine

Technical Field

The invention relates to the technical field of fire fighting, in particular to a boom structure of a fluid conveying device and a fire fighting truck.

Background

In the prior art, a folding fire extinguishing vehicle is adopted under the fire extinguishing condition of a high-rise building, and the folding fire extinguishing vehicle needs a larger high-altitude operation space. When the foldable fire extinguishing vehicle is used, the four fixing supports at the bottom need to be extended out, and after the fixing supports are fixed, the folding and the expansion are started; when folding, need earlier to fold the arm and expand, will put out a fire the mechanism and reach appointed position of putting out a fire again, begin the infusion and put out a fire.

In the prior art, the following disadvantages exist:

1) When the inner pipe extends out, one end of the multi-stage telescopic arm far away from the slewing mechanism is bent downwards, so that the multi-stage telescopic arm is deformed;

2) The mechanism is complicated, and the failure rate is high.

Disclosure of Invention

Therefore, it is necessary to provide a boom structure of a fluid conveying device and a fire fighting truck

In order to achieve the above object, the present application provides a boom structure of a fluid conveying device, including: the device comprises a first angle sensor, a second angle sensor, a control unit, a multi-stage telescopic arm and a steel wire winch structure;

the multi-stage telescopic arm extends or contracts along the self-axis direction; the first angle sensor and the second angle sensor are respectively arranged on different stages of telescopic arms in the multi-stage telescopic arms;

the steel wire winch structure comprises a winch, a support arm, a pulley and a steel wire rope; the winch is arranged at one end of the multistage telescopic arm, the other end of the multistage telescopic arm is connected with the winch through the steel wire rope, the support arm is arranged on the multistage telescopic arm, the pulley is arranged at one end, away from the multistage telescopic arm, of the support arm, the steel wire rope bypasses the pulley, and the winch is used for winding and unwinding the steel wire rope; the control unit is electrically connected with the first angle sensor, the second angle sensor and the winch;

the first angle sensor and the second angle sensor are respectively used for detecting the angle values of different stages of telescopic arms in the multi-stage telescopic arms; the control unit is used for calculating the difference between the two angle values and judging whether the difference between the two angle values is larger than a first preset angle value or not; if the difference between the two angle values is larger than the first preset angle value, the control unit drives the winch to tighten the steel wire rope so that the difference between the two angle values is smaller than the second preset angle value.

The multi-stage telescopic arm is arranged on the slewing mechanism, and one end of the multi-stage telescopic arm is hinged with the slewing mechanism.

Further, the wire reel structure further includes: a plurality of pulleys; a pulley is arranged at one end of the multi-stage telescopic arm far away from the slewing mechanism;

and one end of the steel wire rope is fixed on the winch, and the other end of the steel wire rope sequentially bypasses the pulley at the end part of the support arm, the pulley at the end part of the multi-stage telescopic arm and the pulley at the end part of the support arm and is fixed on the multi-stage telescopic arm.

Further, the support arm is rotatably arranged on the multistage telescopic arm.

Furthermore, a hydraulic rod is further arranged on the support arm, one end of the hydraulic rod is rotatably connected with the support arm, and the other end of the hydraulic rod is rotatably connected with the multi-stage telescopic arm.

Furthermore, the size of each stage of telescopic arm in the multistage telescopic arm becomes little in proper order, and the capstan winch sets up on the biggest one-level telescopic arm.

Further, the multi-stage telescopic arm includes: the device comprises a first pipe body, a second pipe body and a driving mechanism; the first pipe body and the second pipe body are mutually nested in a sliding manner; the second pipe body is arranged at one end of the first pipe body in a telescopic mode, the driving mechanism is arranged on the first pipe body, and the driving mechanism is used for driving the second pipe body to stretch in the first pipe body.

Further, the second pipe body is provided with threads relative to the wall of the first pipe body, a driving mechanism is arranged on the first pipe body, the driving mechanism comprises a rotating body and a connecting component, the rotating body is provided with threads, the threads of the rotating body are force transmission screws, the threads of the second pipe body are matched with the threads of the rotating body, the connecting component is used for fixing the rotating body and the first pipe body in an axial direction, and the rotating body can rotate around the rotation center of the rotating body;

wherein the rotary body is configured such that, when the rotary body rotates about its own rotation center, the thread of the rotary body and the thread of the second pipe body perform an engagement motion, and an axial driving force is applied to the second pipe body by the thread engagement motion with each other, so that the second pipe body performs an axial relative motion with respect to the first pipe body.

Further, the driving mechanism further includes: a power source for driving the rotating body to rotate about its own rotation center.

In order to achieve the above object, the present application provides a fire fighting truck, which includes a vehicle chassis, a truck body, and a boom structure of the fluid conveying device in any one of the above embodiments;

the vehicle body is arranged on the vehicle chassis, and the vehicle chassis is used for providing power for the fire fighting truck;

the rotating structure of the fluid conveying device is arranged on the vehicle body.

Different from the prior art, according to the technical scheme, the steel wire winch structure, the control unit, the first angle sensor and the second angle sensor are arranged, so that when the multi-stage telescopic arm extends outwards, one end, far away from the slewing mechanism, of the multi-stage telescopic arm is prevented from bending downwards and deforming; and simultaneously, the lifting height of the multistage telescopic arm is increased.

Drawings

FIG. 1 is a first section structure diagram of a boom of a fire fighting truck;

FIG. 2 is a second section of the structure of the arm support of the fire fighting truck;

FIG. 3 is a cross-sectional view of the first and second tubes;

FIG. 4 is a structural view of a fire fighting truck;

FIG. 5 is an enlarged view of FIG. 4 at A;

fig. 6 is an enlarged view of fig. 4 at B.

Description of reference numerals:

1. a swing mechanism;

2. a first angle sensor;

3. a second angle sensor;

4. a multi-stage telescopic arm;

40. a first pipe body;

41. a second tube;

42. a drive mechanism;

420. a rotating body;

421. a power source;

4210. a rotating turbine;

4211. a scroll bar;

422. a bearing;

5. a wire winch structure;

50. a winch;

51. a wire rope;

52. a support arm;

53. a pulley;

54. a hydraulic rod.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1 to 6, the present invention discloses a boom structure of a fluid transportation device, including: the device comprises a first angle sensor 2, a second angle sensor 3, a control unit, a multi-stage telescopic arm 4 and a steel wire winch structure 5;

the multi-stage telescopic arm 4 extends or contracts along the self-axis direction; the first angle sensor 2 and the second angle sensor 3 are respectively arranged on different stages of telescopic arms in the multi-stage telescopic arms;

the steel wire winch structure 5 comprises a winch 50, a support arm 52, a pulley 53 and a steel wire rope 51; the winch 50 is arranged at one end of the multi-stage telescopic boom 4, the other end of the multi-stage telescopic boom 4 is connected with the winch 50 through the steel wire rope 51, the support arm 52 is arranged on the multi-stage telescopic boom 4, the pulley 53 is arranged at one end of the support arm 52 far away from the multi-stage telescopic boom 4, the steel wire rope bypasses the pulley 53, and the winch 50 is used for winding and unwinding the steel wire rope 51; the control unit is electrically connected with the first angle sensor 2, the second angle sensor 3 and the winch 50;

the first angle sensor 2 and the second angle sensor 3 are respectively used for detecting the angle values of different stages of telescopic arms in the multi-stage telescopic arms 4; the control unit is used for calculating the difference between the two angle values and judging whether the difference between the two angle values is larger than a first preset angle value or not; if the difference between the two angle values is greater than the first preset angle value, the control unit drives the winch 50 to tighten the steel wire rope 51 so that the difference between the two angle values is smaller than the second preset angle value.

In some embodiments, the swing mechanism 1 is further included, the multi-stage telescopic arm 4 is disposed on the swing mechanism 1, and one end of the multi-stage telescopic arm 4 is hinged to the swing mechanism 1.

It should be noted that, the swing mechanism 1 is arranged on a fire fighting truck, the swing mechanism 1 can horizontally rotate to any direction, and the multi-stage telescopic boom 4 rotates along with the swing mechanism 1; one end of the multi-stage telescopic arm 4 is rotatably connected with the slewing mechanism 1, so that the multi-stage telescopic arm 4 can rotate around the slewing connection part. The multi-stage telescopic boom 4 is provided with a plurality of pipe bodies through sliding sleeves, so that the telescopic function of the multi-stage telescopic boom 4 is realized. When the multi-stage telescopic boom 4 is extended, the wire rope 51 on the winch 50 will be pulled out by the end of the multi-stage telescopic boom 4 away from the swing mechanism 1. Preferably, the first angle sensor and the second angle sensor are respectively disposed at two end portions of the multi-stage telescopic arm 4.

Wherein, multistage flexible arm 4 can arrange more than two bodys according to the flexible demand of reality, and the mutual nested connection of more than two fluid delivery bodys to the length of multistage flexible arm 4 is prolonged. The fluid conveying pipe body is provided with a channel for allowing fluid to pass through. Preferably, the pulley on the support arm is disposed above the multi-stage telescopic arm (with respect to gravity, i.e., above in a vertical direction of gravity), so that the multi-stage telescopic arm can be driven to move upward when the wire rope is tightened.

Please refer to fig. 5 to 6, the first angle sensor 2 and the second angle sensor 3 measure the angle values at two ends of the multi-stage telescopic arm 4 through a built-in gyroscope; specifically, the first angle sensor 2 and the second angle sensor 3 both use a horizontal plane as a reference plane, and the first angle sensor 2 and the second angle sensor 3 respectively measure included angles (which may be an inclination angle sensor, an acceleration sensor, and the like) between two stages (which may be a first stage and a last stage) of the multi-stage telescopic arm 4 and the horizontal plane; preferably, the first angle sensor 2 is disposed at one end of the multi-stage telescopic arm 4 close to the swing mechanism 1, and the second angle sensor 3 is disposed at one end of the multi-stage telescopic arm 4 far from the swing mechanism 1.

The wire rope 51 connects one end of the multi-stage telescopic boom 4 away from the slewing mechanism 1 with the winch 50 from above the multi-stage telescopic boom 4; the steel wire rope 51 is wound on the winch 50, and the winch 50 is used for winding and unwinding the steel wire rope 51; under the action of the winch 50, the wire rope 51 can adjust the angle of the end of the multi-stage telescopic boom 4 away from the swing mechanism 1 after the multi-stage telescopic boom 4 extends. Specifically, when the winch 50 tightens the wire rope 51, the wire rope 51 will lift the multi-stage telescopic boom 4 upward away from one end of the swing mechanism 1; when the winch 50 discharges the wire rope 51, the end of the multi-stage telescopic arm 4 away from the swing mechanism 1 moves downward under the action of gravity.

It should be further noted that, after the angle information of the positions of the first angle sensor 2 and the second angle sensor 3 is measured, the two angle information are sent to the control unit, the control unit calculates an angle difference through the two angles, and judges and drives the winch 50 to tighten or release the steel wire rope 51 according to the angle difference.

In actual use, the multi-stage telescopic arm 4 rotates around the rotating part and stops after reaching a required angle, the multi-stage telescopic arm 4 extends outwards, and under the action of factors such as gravity, one end, far away from the slewing mechanism 1, of the multi-stage telescopic arm 4 bends downwards, so that the multi-stage telescopic arm 4 deforms; the overall height of the multi-stage telescopic arm 4 is now low and damage to the multi-stage telescopic arm is also caused. In order to prevent deformation, the extension length of the multistage telescopic arm 4 is increased; this application passes through wire rope 51's traction reduces multistage flexible arm 4 is kept away from rotation mechanism 1's deformation volume reduces simultaneously multistage flexible arm 4's amount of deflection.

Specifically, when the multi-stage telescopic boom 4 extends outwards, the first angle sensor 2 and the second angle sensor 3 measure angles at two ends of the multi-stage telescopic boom 4 through a built-in gyroscope, and simultaneously send angle information to the control unit; the control unit calculates an angle difference between two ends of the multi-stage telescopic boom 4 through two angles, and when the angle difference is greater than a first preset angle value (in the present application, the first preset angle value is preferably 5 °), the winch 50 is driven to operate to tighten the steel wire rope 51, and when the steel wire rope 51 is tightened, the steel wire rope 51 pulls one end of the multi-stage telescopic boom 4, which is far away from the swing mechanism 1, to move upwards. And when the angle difference is smaller than the second preset angle value, the reel stops tightening the steel wire rope. Of course, in some embodiments, the first predetermined angle value may be equal to the second predetermined angle value.

According to the technical scheme, through the arrangement of the steel wire winch 50 structure 5, the control unit, the first angle sensor 2 and the second angle sensor 3, when the multi-stage telescopic arm 4 extends outwards, one end, far away from the slewing mechanism 1, of the multi-stage telescopic arm 4 is prevented from bending downwards, so that the multi-stage telescopic arm 4 deforms; and simultaneously, the lifting height of the multi-stage telescopic arm 4 is increased.

Referring to fig. 1 to 2, in the present embodiment, the wire winch 50 structure 5 further includes: a support arm 52 and a plurality of pulleys 53; rotatable setting of support arm 52 is in on the flexible arm 4 of multistage, the one end that the rotation end was kept away from to support arm 52 is provided with pulley 53, the flexible arm 4 of multistage is kept away from swing mechanism 1 is served and is set up pulley 53, wire rope 51 one end is fixed in on the wire winch 50, the wire rope 51 other end is walked around in proper order the support arm 52 tip pulley 53 the flexible arm 4 tip of multistage pulley 53 and the support arm 52 tip pulley 53, and be fixed in on the outer wall of flexible arm 4 of multistage. The pulley on the support arm is a fixed pulley, and the pulley on the multistage telescopic arm is a movable pulley.

It should be noted that the arrangement of arm 52 provides an upward pulling force on cable 51, thereby reducing the pulling force exerted by cable winch 50 on cable 51. The number of the pulleys 53 on the support arm 52 is two, and one of the steel wire ropes 51 is respectively arranged on each of the two pulleys 53.

In some embodiments, the size of each stage of telescopic arm in the multi-stage telescopic arm is reduced from outside to inside, and the winch is arranged on the largest stage of telescopic arm.

It should be further noted that, because both ends of the steel wire rope 51 are connected to the largest telescopic boom of the multi-stage telescopic boom 4, one end of the multi-stage telescopic boom 4 away from the swing mechanism 1 is pulled by two steel wire ropes 51, and the gravity borne by the end of the multi-stage telescopic boom 4 is transmitted to the largest telescopic boom of the multi-stage telescopic boom 4 through the support arm 52 by the steel wire rope 51, so that the largest telescopic boom of the multi-stage telescopic boom 4 becomes a stressed body.

Of course, in other embodiments, the wire winch 50 structure 5 may not be provided with the support arm 52, that is, the wire rope 51 is directly connected to the winch 50 and the end of the multi-stage telescopic arm 4 away from the slewing mechanism 1; one end of the wire rope 51 is wound around the winch 50, and the other end is wound around a pulley 53 on the multi-stage telescopic arm 4 and fixed on the multi-stage telescopic arm 4. When the difference between the two angles is greater than a first preset angle value, the winch 50 is started to pull the steel wire rope 51, and under the action of a larger pulling force, one end of the multi-stage telescopic boom 4, which is far away from the slewing mechanism 1, is lifted up under stress, so that the deformation of the multi-stage telescopic boom 4 is reduced. In this embodiment, a movable pulley may be disposed on the wire rope 51 to reduce the tension of the winch 50.

Referring to fig. 4, in the present embodiment, a hydraulic rod 54 is further disposed on the supporting arm 52, one end of the hydraulic rod 54 is rotatably connected to the supporting arm 52, and the other end of the hydraulic rod 54 is rotatably connected to the multi-stage telescopic arm 4. It should be noted that the hydraulic rod 54 drives the support arm 522 to extend, so that the support arm 52 and the second telescopic arm 4 form a non-zero included angle; preferably, the support arm 52 is perpendicular to the multi-stage telescopic arm 4 when extended.

Referring to fig. 3, in the present embodiment, the multi-stage telescopic arm 4 includes: a first pipe 40, a second pipe 41, and a driving mechanism 42; the first tube 40 and the second tube 41 are nested in a sliding manner; the second tube 41 is telescopically disposed at one end of the first tube 40, the driving mechanism 42 is disposed on the first tube 40, and the driving mechanism 42 is configured to drive the second tube 41 to be telescopically disposed in the first tube 40. It should be noted that, in the fire fighting truck, a plurality of pipe bodies are provided in the multi-stage telescopic boom 4, and are nested in a sliding manner, and the application takes two of the pipe bodies as an example, the first pipe body 40 is the largest telescopic boom, and the second pipe body 41 is the telescopic boom in the largest telescopic boom. Thus, at the end of the second body 41 there is also a drive means 42, and the outer wall of the first body 40 can also have a guide groove and a thread.

Referring to fig. 3, in this embodiment, the driving mechanism 42 includes a rotating body 420 and a connecting assembly, the rotating body 420 is provided with a thread, the thread of the rotating body 420 is a force-transmitting screw, the thread of the second tube 41 is matched with the thread of the rotating body 420, the connecting assembly is used for axially fixing the rotating body 420 and the first tube 40 relatively, and the rotating body 420 can rotate around its own rotation center; wherein the rotating body 420 is configured such that when the rotating body 420 rotates around its own rotation center, the thread of the rotating body 420 and the thread of the second tube 41 perform an engagement motion, and an axial driving force is applied to the second tube 41 through the engagement motion of the threads with each other, so that the second tube 41 performs an axial relative motion with respect to the first tube 40. The drive mechanism 42 further includes: a power source 421 for driving the rotating body 420 to rotate about its own rotation center by the power source 421. The power source 421 includes a rotary turbine 4210 and a worm 4211, the worm 4211 is disposed at one side of the rotary turbine 4210, the rotary turbine 4210 is fixedly connected to the rotary body 420, and the worm 4211 is engaged with the rotary turbine 4210.

The rotating body 420 is a swivel nut having an internal thread, and is disposed on the second pipe 41 by the engagement of the swivel nut internal thread and the external thread of the second pipe 41. The swivel nut is sleeved on the second tube 41 through the matching of the internal thread of the swivel nut and the external thread of the second tube 41, and the extension and retraction of the second tube 41 in the first tube 40 can be controlled as long as the swivel nut can be driven to rotate.

The power source 421 is provided at one side of the rotating body 420, and the power source 421 is used for driving the rotating body 420 to rotate. The power source 421 includes a rotary turbine 4210 and a worm 4211, the worm 4211 is disposed at one side of the rotary turbine 4210, the rotary turbine 4210 is fixedly connected with a rotary nut, and the worm 4211 is engaged with the rotary turbine 4210. At this time, by the cooperation of the worm wheel and the worm 4211, the rotation number of the motor or the motor can be reduced to a desired rotation number by the speed conversion of the gear by using the principle of the worm wheel and the worm 4211 speed reducer, and a large torque is obtained, so that the rotation of the rotary nut can be conveniently driven. In other embodiments, the rotary turbine 4210 and the worm 4211 can be replaced by a rotary toothed disk and a gear, the gear is disposed on one side of the rotary toothed disk, the rotary toothed disk is fixedly connected with the rotary nut, and the gear is engaged with the rotary toothed disk. In this case, it is within the scope of the present embodiment that the rotation of the swivel nut can be driven by only the rotation of the drive gear.

In other embodiments, the rotary turbine 4210 and the scroll 4211 may be replaced with a rotary friction disk and a friction wheel, the friction wheel is disposed at one side of the rotary friction disk, the rotary friction disk is fixedly connected with the rotary nut, and the friction wheel is in contact with the rotary friction disk. In this case, it is within the scope of the present embodiment that the rotation of the swivel nut can be driven by driving the rotation of the friction wheel.

It should be noted that the worm 4211, the gear or the friction wheel are powered by any one of a hydraulic motor, a pneumatic motor and an electric motor. In some embodiments, the drive mechanism 42 further includes a cover for covering the drive mechanism 42. In this case, the cover is used for dust-proof and water-proof of the drive mechanism 42.

The connecting assembly includes a bearing 422, one side of the bearing 422 is fixedly connected to the axial position of the first pipe 40, and the other side of the bearing 422 movably supports the rotating body 420.

In practical use, the driving mechanism 42 is used as follows: the power source 421 is started, the power source 421 drives the worm 4211 to rotate, the worm 4211 drives the rotary turbine 4210 to rotate, and the rotary turbine 4210 drives the rotary body 420 to rotate, so that the second pipe body 41 stretches in the first pipe body 40, and then the infusion fluid is infused into the first pipe body 40, so that fire is extinguished. After the fire extinguishing is finished, the power source 421 drives the worm 4211 to rotate, and the second pipe 41 is retracted to complete the operation.

In some embodiments, the driving mechanism 42 includes a connecting assembly for axially fixing the rotating body 420 and the first pipe body 40 relative to each other. The connecting assembly includes a bearing 422, one side of the bearing 422 is fixedly connected to the axial position of the first pipe 40, and the other side of the bearing 422 movably supports the rotating body 420.

It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.

Claims (10)

1. A boom structure of a fluid conveying device is characterized by comprising: the device comprises a first angle sensor, a second angle sensor, a control unit, a multi-stage telescopic arm and a steel wire winch structure;

the multi-stage telescopic arm extends or contracts along the self-axis direction; the first angle sensor and the second angle sensor are respectively arranged on different stages of telescopic arms in the multi-stage telescopic arms;

the steel wire winch structure comprises a winch, a support arm, a pulley and a steel wire rope; the winch is arranged at one end of the multistage telescopic arm, the other end of the multistage telescopic arm is connected with the winch through the steel wire rope, the support arm is arranged on the multistage telescopic arm, the pulley is arranged at one end, far away from the multistage telescopic arm, of the support arm, the steel wire rope bypasses the pulley, and the winch is used for winding and unwinding the steel wire rope; the control unit is electrically connected with the first angle sensor, the second angle sensor and the winch;

the first angle sensor and the second angle sensor are respectively used for detecting the angle values of different stages of telescopic arms in the multi-stage telescopic arms; the control unit is used for calculating the difference between the two angle values and judging whether the difference between the two angle values is larger than a first preset angle value or not; if the difference between the two angle values is larger than the first preset angle value, the control unit drives the winch to tighten the steel wire rope so that the difference between the two angle values is smaller than the second preset angle value, and the end, far away from the winch, of the multi-stage telescopic arm is lifted upwards, so that the multi-stage telescopic arm is prevented from being bent.

2. The boom structure of a fluid conveying device as claimed in claim 1, further comprising a swing mechanism, wherein the multi-stage telescopic arm is disposed on the swing mechanism, and one end of the multi-stage telescopic arm is hinged to the swing mechanism.

3. The boom structure of the fluid conveying device according to claim 2, wherein the wire winch structure further comprises: a plurality of pulleys; a pulley is arranged at one end of the multi-stage telescopic arm far away from the slewing mechanism;

and one end of the steel wire rope is fixed on the winch, and the other end of the steel wire rope sequentially bypasses the pulley at the end part of the support arm, the pulley at the end part of the multi-stage telescopic arm and the pulley at the end part of the support arm and is fixed on the multi-stage telescopic arm.

4. The boom structure of fluid conveying device according to claim 1, wherein the support arm is rotatably disposed on the multi-stage telescopic arm.

5. The boom structure of the fluid conveying device according to claim 4, wherein a hydraulic rod is further disposed on the supporting arm, one end of the hydraulic rod is rotatably connected to the supporting arm, and the other end of the hydraulic rod is rotatably connected to the multi-stage telescopic arm.

6. The boom structure of a fluid conveying device according to claim 1, wherein each stage of the multi-stage telescopic boom is sequentially smaller in size, and the winch is disposed on the largest stage of the telescopic boom.

7. The boom structure of a fluid transfer device of claim 1, wherein the multi-stage telescopic boom comprises: the device comprises a first pipe body, a second pipe body and a driving mechanism; the first pipe body and the second pipe body are mutually nested in a sliding manner; the second pipe body is arranged at one end of the first pipe body in a telescopic mode, the driving mechanism is arranged on the first pipe body, and the driving mechanism is used for driving the second pipe body to stretch in the first pipe body.

8. The boom structure of a fluid conveying device according to claim 7, wherein the second pipe is provided with a thread with respect to a wall of the first pipe, the first pipe is provided with a driving mechanism, the driving mechanism comprises a rotating body provided with a thread, the thread of the rotating body is a force transmission screw, the thread of the second pipe is matched with the thread of the rotating body, and a connecting component is used for fixing the rotating body and the first pipe in an axial direction, and the rotating body can rotate around a rotation center of the rotating body;

wherein the rotary body is configured such that, when the rotary body rotates about its own rotation center, the thread of the rotary body and the thread of the second pipe body perform an engagement motion, and an axial driving force is applied to the second pipe body by the thread engagement motion with each other, so that the second pipe body performs an axial relative motion with respect to the first pipe body.

9. The boom structure of a fluid delivery device of claim 8, wherein the drive mechanism further comprises: a power source for driving the rotating body to rotate about its own rotation center.

10. A fire fighting truck is characterized by comprising a truck chassis, a truck body and

a boom structure for a fluid transfer device as claimed in any one of claims 1 to 9;

the vehicle body is arranged on the vehicle chassis, and the vehicle chassis is used for providing power for the fire fighting truck;

the boom structure of the fluid conveying device is arranged on the vehicle body.

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