CN215961926U - Boom structure of fluid conveying device - Google Patents

Abstract

The utility model discloses an arm support structure of a fluid conveying device, wherein a first pipe body and a second pipe body are nested in a sliding mode, and a driving mechanism is arranged on the first pipe body; the control unit is electrically connected with the driving mechanism, the first in-place detection mechanism and the second in-place detection mechanism; the signal input end of the first in-place detection mechanism is connected with a rotating shaft in the driving mechanism, and the number of rotating turns of the rotating shaft in the driving mechanism of the first in-place detection mechanism is converted into an electric signal; the signal detection end of the second in-place detection mechanism is arranged on the first pipe body, the sensing induction unit of the second in-place detection mechanism is arranged on the second pipe body, and the signal detection end of the second in-place detection mechanism is used for detecting the sensing induction unit of the second in-place detection mechanism. The first in-place detection mechanism and the second in-place detection mechanism are used for monitoring the real-time position of the second pipe body; when the first in-place detection mechanism or the second in-place detection mechanism sends a signal, the driving mechanism stops driving the second pipe body to prevent the second pipe body from falling off from the first pipe body.

Description

Boom structure of fluid conveying device

Technical Field

The utility model relates to the technical field of fire fighting, in particular to a boom structure of a fluid conveying device.

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 defects exist:

1) the process of extending the inner tube is cumbersome.

2) When the inner pipe extends out, the inner pipe is easy to be separated from the end part of the outer pipe.

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

SUMMERY OF THE UTILITY MODEL

Therefore, it is desirable to provide a boom structure of a fluid conveying device, which prevents the second pipe from falling off from the first pipe.

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 pipe body, a second pipe body, a driving mechanism, a control unit, a first in-place detection mechanism and a second in-place detection mechanism;

the first pipe body and the second pipe body are mutually nested in a sliding 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 and retract on the first pipe body; the control unit is electrically connected with the driving mechanism, the first in-place detection mechanism and the second in-place detection mechanism;

the signal input end of the first in-place detection mechanism is connected with the driving mechanism, and the first in-place detection mechanism is used for converting the number of turns of the driving mechanism into an electric signal and sending the electric signal to the control unit; when the counted number of the rotation turns corresponding to the distance of the second pipe body extending out of the first pipe body is equal to the preset stop rotation turns, the second pipe body is located at a preset position;

the sensor of the second in-place detection mechanism is arranged on the first pipe body, the sensing unit of the second in-place detection mechanism is arranged on the second pipe body, the sensor of the second in-place detection mechanism is used for sensing the sensing unit, and when the sensor of the second in-place detection mechanism senses the sensing unit, the second pipe body is located at a preset position.

Further, the drive mechanism includes: the rotary body, the connecting assembly and the power source;

the rotator is provided with threads, the second pipe is provided with threads relative to the wall of the first pipe body, the threads of the second pipe body are matched with the threads of the rotator, the connecting assembly is used for fixing the rotator and the first pipe body in an axial direction, the rotator can rotate around the rotation center of the rotator, and the power source is used for driving the rotator to rotate around the rotation center of the rotator.

Further, the power supply is rotatory worm wheel and worm, the worm sets up one side of rotatory worm wheel, rotatory worm wheel with rotator fixed connection, the worm with rotatory worm wheel meshes mutually.

Further, the first in-place detection mechanism is a rotation angle acquisition sensor;

the driving mechanism comprises a rotating body and a power source, the second pipe body is provided with threads relative to the wall of the first pipe body, the rotating body is provided with threads, the threads of the second pipe body are matched with the threads of the rotating body, and the rotating body can rotate around the rotation center of the rotating body; the power source drives the rotating body to rotate, so that the second pipe body generates axial relative motion relative to the first pipe body;

the rotation angle acquisition sensor is arranged on the power source or the rotating body, and the signal input end of the rotation angle acquisition sensor is connected with the rotating shaft or the rotating body in the power source.

Furthermore, the power source is a rotary worm wheel and a worm, and a rotating shaft in the driving mechanism is a worm; the worm is arranged on one side of the rotating worm wheel, the rotating worm wheel is fixedly connected with the rotating body, and the worm is meshed with the rotating worm wheel; and the signal input end of the rotation angle acquisition sensor is connected with the worm.

Furthermore, the second pipe body is arranged at one end of the first pipe body in a telescopic mode, a guide groove is formed in the wall, opposite to the first pipe body, of the second pipe body, a guide block is fixedly arranged on the wall, opposite to the second pipe body, of the first pipe body, the guide block is arranged in the guide groove, and the guide groove slides on the guide block.

Further, the second in-place detecting mechanism includes: a sensing unit and a sensor;

the sensor is arranged on the first pipe body; the sensing induction units are positioned at two ends of the second pipe body; the sensor is used for sensing the sensing unit.

Further, the sensor is an infrared sensor, a proximity sensor or an in-place detection sensor.

Further, the sensing induction unit is a limiting groove.

Further, the device also comprises a braking unit; the braking units are arranged at two end parts of the guide groove and used for blocking the guide block to prevent the guide block from sliding out of the guide groove;

when the braking unit touches the guide block, the control unit acquires the increase of the torque force through the torque sensor, and the second pipe body is located at a preset position.

Different from the prior art, in the above technical scheme, the first in-place detection mechanism and the second in-place detection mechanism are used for monitoring the real-time position of the second pipe body; when the first in-place detection mechanism or the second in-place detection mechanism sends a signal, the driving mechanism stops driving the second pipe body to prevent the second pipe body from falling off from the first pipe body.

Drawings

Fig. 1 is a first section of a structure diagram of a boom structure of the fluid conveying device;

FIG. 2 is a second section of the structure of the boom of the fluid transportation device;

FIG. 3 is an enlarged view of FIG. 1 at A;

FIG. 4 is an enlarged view of FIG. 2 at B;

FIG. 5 is a cross-sectional view of the first and second tubes;

FIG. 6 is an enlarged view of FIG. 5 at C;

FIG. 7 is a view showing the structure of the guide groove and the brake unit;

FIG. 8 is a schematic block diagram of the drive mechanism;

FIG. 9 is a schematic block diagram of the power source;

fig. 10 is a structural view of the fire fighting truck.

Description of reference numerals:

1. a first pipe body;

10. a guide block;

2. a second tube body;

20. a guide groove;

3. a drive mechanism;

30. a rotating body;

31. a power source;

311. rotating the worm gear;

312. a worm;

313. a bearing;

4. a second in-place detection mechanism;

40. a sensing unit;

41. a sensor;

42. a through hole;

5. and a brake unit.

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 10, the present application provides a boom structure of a fluid conveying device, including: the device comprises a first pipe body 1, a second pipe body 2, a driving mechanism 3, a control unit, a first in-place detection mechanism and a second in-place detection mechanism 4; the first pipe body 1 and the second pipe body 2 are nested in a sliding mode, the driving mechanism 3 is arranged on the first pipe body 1, and the driving mechanism 3 is used for driving the second pipe body 2 to stretch and retract on the first pipe body 1; the control unit is electrically connected with the driving mechanism 3, the first in-place detection mechanism and the second in-place detection mechanism 4; the signal input end of the first in-place detection mechanism is connected with a rotating shaft in the driving mechanism 3, and the first in-place detection mechanism is used for converting the number of rotating turns of the rotating shaft in the driving mechanism 3 into an electric signal and sending the electric signal to the control unit; the sensor of the second in-place detection mechanism 4 is arranged on the first pipe body 1, the sensing unit of the second in-place detection mechanism 4 is arranged on the second pipe body 2, and the sensor of the second in-place detection mechanism 4 is used for detecting the sensing unit of the second in-place detection mechanism 4.

Furthermore, a signal input end of the first in-place detection mechanism is connected with the driving mechanism, and the first in-place detection mechanism is used for converting the number of rotation turns of the driving mechanism into an electric signal and sending the electric signal to the control unit; when the counted number of the rotation turns corresponding to the distance of the second pipe body extending out of the first pipe body is equal to the preset stop rotation turns, the second pipe body is located at a preset position;

the sensor of the second in-place detection mechanism is arranged on the first pipe body, the sensing unit of the second in-place detection mechanism is arranged on the second pipe body, the sensor of the second in-place detection mechanism is used for sensing the sensing unit, and when the sensor of the second in-place detection mechanism senses the sensing unit, the second pipe body is located at a preset position;

when the first in-place detection mechanism and the second in-place detection mechanism detect that the second pipe body is located at a preset position at any one or at the same time, the control unit controls the driving mechanism to stop driving the second pipe body continuously. The preset position is the maximum length that the second pipe body can extend out, or the preset position is the maximum length that the second pipe body can retract into the first pipe body.

It should be noted that the first in-place detection mechanism and the second in-place detection mechanism 4 are both used for preventing the second pipe body 2 from falling off from the first pipe body 1 when being stretched;

specifically, the first in-position detecting mechanism is connected to the rotating shaft in the driving mechanism 3, but may be disposed on the rotating body in some embodiments; when the driving mechanism 3 drives the second pipe body 2 to stretch, a rotating shaft in the driving mechanism 3 rotates, and a signal input shaft of the first in-place detection mechanism is driven by the rotating shaft in the driving mechanism 3 to transmit together; first detection mechanism that targets in place sends pivot forward rotation number of turns and the number of turns of counter rotation to the control unit, the control unit records and calculates the forward rotation number of turns and the number of turns of counter rotation, the control unit is arranged in when obtaining that the count value of the number of turns of rotation that the distance that stretches out when the second body stretches out from first body equals to predetermine the number of turns of counter rotation, the control unit control actuating mechanism stops to continue the drive the second body.

It should be noted that the corresponding count value of the number of turns of rotation is two, one is the count value of the number of turns of rotation of the rotating shaft in the power source, and the other is the count value of the number of turns of rotation of the rotating body; and respectively correspond to two preset stop rotation turns.

The preset number of rotation stopping turns is the number of turns of rotation of the rotating shaft of the rotating body or the power source when the second pipe body extends to the maximum length, and when the rotating shaft of the rotating body or the power source rotates to the number of turns, the second pipe body stops extending; that is, when the rotating shaft rotates to the preset stop rotation number of turns, if the second pipe body 2 stretches out again, the second pipe body has the risk of being separated from the first pipe body 1.

When the count value of the number of rotation turns corresponding to the extension distance of the second pipe body extending from the first pipe body is equal to the preset number of rotation stop turns, the driving mechanism 3 stops driving the second pipe body 2 to continue to extend, and similarly, when the count value is equal to 0, the driving mechanism 3 stops driving the second pipe body 2 to continue to retract; in this application, one rotation of the shaft in the forward direction means "+ 1" and one rotation in the reverse direction means "-1". Specifically, the count value begins the count when first body bottommost is arranged in from the second body, and when the second body stretches out, the count increases, and when the second body contracts, the count reduces, the count value is with the distance positive correlation that the second body stretches out first body, and different distances correspond the count value of the different number of turns of rotation.

Two sensing induction units in the second in-place detection mechanism 4 are respectively arranged at two ends of the second pipe body 2, one sensing end is arranged at the telescopic end of the first pipe body 1, when the sensing induction units are detected by the sensing ends, the second in-place detection mechanism 4 sends a signal to the control unit, and the driving mechanism 3 stops driving the second pipe body 2 to continue to extend or retract; the flexible end of first body 1 is first body 1 supplies the flexible one end of second body 2.

It should be further noted that, when the control unit receives a signal sent by the first in-place detection mechanism or the second in-place detection mechanism 4, the control unit drives the driving mechanism 3 to stop driving the second pipe 2.

In the above technical solution, the first in-place detection mechanism and the second in-place detection mechanism 4 are used for monitoring the real-time position of the second pipe body 2; when the first in-place detection mechanism or the second in-place detection mechanism 4 sends a signal, the driving mechanism 3 stops driving the second pipe body 2, and the second pipe body 2 is prevented from falling off from the first pipe body 1.

Referring to fig. 1, 5 and 7, in the present embodiment, the driving mechanism 3 includes a rotating body 30 and a connecting assembly, the rotating body 30 is provided with a thread, the thread of the rotating body 30 is a force transmission screw, the thread of the second tube 2 is matched with the thread of the rotating body 30, the connecting assembly is used for axially fixing the rotating body 30 and the first tube 1 relatively, and the rotating body 30 can rotate around its own rotation center; wherein the rotating body 30 is configured such that when the rotating body 30 rotates around its own rotation center, the thread of the rotating body 30 and the thread of the second pipe 2 perform an engagement motion, and an axial driving force is applied to the second pipe 2 by the engagement motion of the threads with each other, so that the second pipe 2 performs an axial relative motion with respect to the first pipe 1. The drive mechanism 3 further includes: a power source 31, the power source 31 being for driving the rotating body 30 to rotate about its own rotation center. The power source 31 is a rotary worm wheel 311 and a worm 312, the worm 312 is disposed at one side of the rotary worm wheel 311, the rotary worm wheel 311 is fixedly connected with the rotary body 30, and the worm 312 is engaged with the rotary worm wheel 311.

The rotating body 30 is a rotating nut, and an internal thread is provided on the rotating nut, and the rotating nut is provided on the second pipe 2 by matching the internal thread with the external thread of the second pipe 2. The swivel nut is sleeved on the second pipe body 2 through the matching of the swivel nut internal thread and the second pipe body 2 external thread, and the second pipe body 2 can be controlled to stretch in the first pipe body 1 as long as the swivel nut can be driven to rotate.

Referring to fig. 8 and 9, it should be further noted that the power source 31 is disposed on one side of the rotating body 30, and the power source 31 is used for driving the rotating body 30 to rotate. The power source 31 comprises a rotary worm wheel 311 and a worm 312, the worm 312 is arranged on one side of the rotary worm wheel 311, the rotary worm wheel 311 is fixedly connected with a rotary nut, and the worm 312 is meshed with the rotary worm wheel 311; the rotating shaft in the driving mechanism 3 is a worm 312. At this time, by the cooperation of the worm wheel and the worm 312, 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 worm 312 speed reducer, and a large torque is obtained, so that the rotation of the rotary nut is conveniently driven. In other embodiments, the rotating worm wheel 311 and worm 312 can be replaced by a rotating toothed disk and a gear, the gear is disposed on one side of the rotating toothed disk, the rotating toothed disk is fixedly connected with the rotating nut, and the gear is meshed with the rotating 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 rotating worm wheel 311 and the worm 312 may be replaced by a rotating friction disc and a friction wheel, the friction wheel is arranged at one side of the rotating friction disc, the rotating friction disc is fixedly connected with the rotating nut, and the friction wheel is in contact with the rotating friction disc. 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 also be noted that the worm 312, gears or friction wheels are powered by any one of a hydraulic motor, a pneumatic motor, and an electric motor. In some embodiments, the driving mechanism 3 further comprises a cover for covering the driving mechanism 3. At this time, the cover is used for dust-proof and water-proof of the drive mechanism 3.

The connecting assembly comprises a bearing 313, one side of the bearing 313 is fixedly connected with the axial position of the first pipe body 1, and the other side of the bearing 313 movably supports the rotating body 30.

In practical use, the driving mechanism 3 is used as follows: the power source 31 is started, the power source 31 drives the worm 312 to rotate, the worm 312 drives the rotary worm wheel 311 to rotate, the rotary worm wheel 311 drives the rotary body 30 to rotate, and therefore the second pipe body 2 stretches in the first pipe body 1, and then the liquid is conveyed in the first pipe body 1, and therefore fire extinguishing is conducted on fire points. After the fire extinguishing is finished, the worm 312 is driven to rotate by the power source 31, the second pipe body 2 is retracted, and the operation is finished.

Referring to fig. 1 to 2, it should be noted that the second tube 2 extends from the first tube 1 to a certain length and reaches a maximum length, and if the second tube 2 continues to extend, the second tube 2 is at risk of being separated from the first tube 1; meanwhile, the second tube 2 is controlled by the rotating body 30 to extend and retract. Therefore, when the second pipe body 2 reaches the maximum length, the counted number of the rotation turns of the worm 312 reaches the preset rotation stop number or the rotation body reaches the preset rotation stop number, that is, the counted number of the rotation turns of the worm 312 corresponding to the extending distance when the second pipe body 2 extends from the first pipe body 1 is equal to the preset rotation stop number.

It should be noted that the rotation angle obtaining sensor is used for recording the number of rotation turns of the rotating shaft of the power source 31, and when the rotating shaft in the driving mechanism 3 rotates for a first preset number of turns, the rotating body 30 rotates for a turn; the control unit presets preset rotation stop turns of the shaft, and when the counted number of the rotation turns of the worm is equal to the preset rotation stop turns, the driving mechanism stops driving the second pipe body 2. The rotation angle acquisition sensor is a rotary encoder or a turn number counter.

It should be further noted that the rotation angle obtaining sensor can also directly calculate the number of rotation turns of the rotating body, and when the number of rotation turns of the rotating body is equal to the preset number of rotation stop turns of the rotating body, the second pipe body 2 reaches the maximum extension length and stops extending.

It should be further explained that the rotating shaft of the power source 31 is the rotating shaft of the driving mechanism 3, and the rotating shaft of the power source 31 is a worm; the worm 312 is in transmission connection with the rotating body 30 through a rotating worm wheel 311 and is used for driving the rotating body 30 to rotate, one end of the worm 312 is connected with the rotation angle acquisition sensor, and the worm 312 is connected with a hydraulic motor, a pneumatic motor or a motor. When the count value of the number of turns of the worm 312 corresponding to the extension distance of the second pipe 2 extending from the first pipe 1 is equal to the preset number of turns of the stop of the worm 312, the second pipe 2 reaches the maximum extension length, and the driving mechanism 3 stops driving the second pipe 2. Of course, in some embodiments, the number of turns of the shaft of the power source 31 may not be an integer.

It should be further noted that the first preset number of turns is 99 turns, that is, the rotating shaft of the power source 31 rotates ninety-nine turns, and the rotating body 30 rotates one turn. A complete extension of the second tubular body 2 requires N rotations of the rotary body 30, i.e. a total number of rotations of 99 × N. When the rotation angle acquisition sensor monitors that the rotating shaft of the power source 31 rotates N × 99 circles, the second pipe body 2 stops extending. Similarly, when the second pipe 2 retracts into the first pipe 1, the rotation angle acquisition sensor records the number of turns of the output end of the power source 31, and calculates the remaining number of turns by subtracting the number of turns of the rotating shaft of the power source 31 from N × 99, and when the remaining number of turns is zero, the second pipe 2 stops retracting; when the second pipe body 2 does not extend out of the first pipe body 1, the second pipe body is a zero position, and the corresponding rotating angle acquisition sensor has a value of 0.

It should be further noted that the rotation angle acquisition sensor is a device for compiling and converting signals or data into signal forms for communication, transmission and storage. In the present application, the rotation angle acquisition sensor converts an angular displacement into an electrical signal, and at this time, a code wheel is provided in the rotation angle acquisition sensor. The rotation angle acquisition sensor sends the converted electric signal to the control unit, and the control unit records and calculates. Through the arrangement of the rotation angle acquisition sensor and the control unit, when the second pipe body 2 extends to the maximum distance, the second pipe body 2 stops extending operation, so that the second pipe body 2 is ensured to be always arranged in the first pipe body 1; meanwhile, the failure rate of the boom structure of the fluid conveying device is reduced.

Referring to fig. 5, in the embodiment, the second pipe bodies 2 are slidably nested with each other, the second pipe body 2 is telescopically disposed at one end of the first pipe body 1, the second pipe body 2 is provided with a guide groove 20 relative to the wall of the first pipe body 1, a guide block 10 is fixedly disposed on the wall of the first pipe body 1 relative to the second pipe body 2, the guide block 10 is disposed in the guide groove 20, and the guide groove 20 slides on the guide block 10.

A through hole 42 penetrating through the wall is formed in the first pipe body 1, the through hole 42 is arranged above the guide groove 20, and the through hole 42 is used for accommodating the sensor 41; the sensing units 40 are located in the guide groove 20, the sensing units 40 are located at two ends of the guide groove 20, and the sensor 41 is used for sensing the sensing units 40; when the sensor 41 faces one of the sensing units 40, the driving mechanism 3 stops driving the second tube 2.

It should be noted that the sensing units 40 are disposed at the bottom of the guide slot 20, and the sensing units 40 are disposed at two ends of the guide slot 20, so that when the guide slot 20 slides along the guide block 10, the sensing units 40 do not contact the guide block 10. The first pipe body 1 and the second pipe body 2 are coaxially arranged, and the guide groove 20 is parallel to the axis of the first pipe body 1. The through hole 42 is used for accommodating the sensor 41.

It should be further noted that, when the second tube 2 extends out of the first tube 1, the through hole 42 is always located above the guide groove 20; at this time, the sensor 41 continuously senses the change of the guide groove 20, and when any one of the sensing units 40 is sensed, the sensor 41 sends a signal to the control unit, and the control unit drives the driving mechanism to stop driving the second tube 2, so as to prevent the second tube 2 from being extended or retracted continuously.

When the second pipe 2 extends from the first pipe 1 for a certain length and reaches a maximum length, if the second pipe 2 continues to extend, the second pipe 2 has a risk of being separated from the first pipe 1; therefore, when the second pipe 2 extends from the first pipe 1 and the second pipe 2 reaches the maximum length, the control unit drives the driving mechanism 3 to stop working, and prevents the second pipe 2 from extending continuously.

Further, when the second tube 2 is retracted and the end of the second tube 2 is disposed at the end of the first tube 1, the control unit drives the driving mechanism 3 to stop driving the second tube 2, so as to prevent the second tube 2 from being retracted continuously. The telescopic end of the first pipe body 1 is the front end of the first pipe body 1, and the other end of the first pipe body 1 is the tail end of the first pipe body 1; when the second pipe 2 extends to the maximum length, the tail end of the second pipe 2 is arranged at the front end of the first pipe 1.

Therefore, in the present application, when the second tube 2 is extended to the maximum length and stops being extended, the second tube 2 is placed at the first predetermined position, that is, the sensing unit 40 of the guide groove 20 near the end of the second tube 2 is placed below the through hole 42; the sensor 41 in the through hole 42 senses the sensing unit 40 and sends a signal to the control unit, and the control unit drives the driving mechanism 3 to stop working, so that the second pipe body 2 stops extending. Similarly, when the end of the second tube 2 is placed at the end of the first tube 1, the sensing unit 40 of the guide groove 20 near the front end of the second tube 2 is placed below the through hole 42; the sensor 41 in the through hole 42 senses the sensing unit 40 and sends a signal to the control unit, and the control unit drives the driving mechanism 3 to stop working, so that the second pipe body 2 stops being recovered.

Specifically, the second preset position is a preset position before the second pipe 2 does not extend out of the first pipe 1, that is, the second preset position is a position where the second pipe 2 is placed in the first pipe 1, and at this time, one of the sensing units 40 is placed at the front end of the second pipe 2 and corresponds to the through hole 42; the first preset position is set to prevent the second pipe 2 from coming off the first pipe 1, that is, the first preset position is a position where the second pipe 2 is located when the second pipe 2 is at the maximum extension length, and at this time, the other sensing unit 40 is disposed at the end of the second pipe 2 and corresponds to the through hole 42.

In the above technical solution, the through hole 42, the sensor 41, the guide block 10, the guide groove 20 and the plurality of sensing units 40 are arranged to prevent the second pipe body 2 from being over-positioned when being extended or retracted; further, the second pipe 2 is prevented from falling off from the first pipe 1, or the first pipe 1 is prevented from being damaged.

It should be further noted that the sensor 41 is an infrared sensor 41, a proximity sensor 41 or a position detection sensor 41. The sensing unit 40 is a limit groove, that is, a groove for the sensor 41 to detect is formed at the bottom of the guide groove 20. The through hole 42 is disposed at one side of the guide block 10.

One end of the first pipe body 1, which is used for the second pipe body 2 to enter and exit, is the front end of the first pipe body 1, and the other end of the first pipe body 1 is the tail end of the first pipe body 1; when the second pipe 2 extends to the maximum length, the tail end of the second pipe 2 is arranged at the front end of the first pipe 1.

Referring to fig. 7, in the present embodiment, the worm is driven by a hydraulic motor; also includes a brake unit 5; the braking units 5 are disposed at two ends of the guide groove 20, the braking units 5 are used for blocking the guide block 10, and the driving mechanism is powered by a hydraulic motor. It should be noted that the braking unit 5 is disposed at the end of the second tube 2, that is, when the second tube 2 is extended to the maximum length, the braking unit 5 contacts the guide block 10; at this time, the brake unit 5 blocks the guide groove 20 from further moving, and the hydraulic motor will further drive the second pipe body 2; preferably, the braking unit is disposed at the end of the second tube 2 and is located in the guide groove 20. Similarly, when the second tube body contracts inwards, the brake unit at the other end can block the guide groove from moving continuously.

Specifically, when the end of the second tube 2 moves to the front end of the first tube 1, the guide block 10 at the front end of the first tube 1 is blocked by the braking unit 5, and at this time, the second tube 2 cannot move forward any more. Meanwhile, as the second pipe 2 is stuck and the driving mechanism 3 continues to operate, the torque value of the driving mechanism 3 (collected by a torque sensor or a torque sensor, which may be implemented by a pressure sensor of a hydraulic hose in some embodiments) will be too large, and the pressure in a hydraulic pipeline connected to the driving mechanism 3 will become large, and the control unit detects the change of the torque value or the pressure value and drives the driving mechanism 3 to stop operating. In the present application, please refer to fig. 3 and 4, in order to prevent the second pipe 2 from coming out of the first pipe 1, three sets of anti-falling systems are provided: a first in-position detection mechanism, a second in-position detection mechanism 4 and a brake unit 5. In practical operation, the three sets of anti-over-position systems can simultaneously and uninterruptedly detect respective over-position signals. When the second pipe body 2 is stretched out from the first pipe body 1, if the three sets of over-position prevention systems do not detect over-position signals at the same time, any one set of system in the three sets of over-position prevention systems detects over-position signals first, and the second pipe body 2 stops stretching out. Preferably, the three sets of anti-over-position systems simultaneously detect over-position signals.

It should be noted that, although the above embodiments have been described herein, the utility model 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 pipe body, a second pipe body, a driving mechanism, a control unit, a first in-place detection mechanism and a second in-place detection mechanism;

the first pipe body and the second pipe body are mutually nested in a sliding 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 and retract on the first pipe body; the control unit is electrically connected with the driving mechanism, the first in-place detection mechanism and the second in-place detection mechanism;

the signal input end of the first in-place detection mechanism is connected with the driving mechanism, and the first in-place detection mechanism is used for converting the number of turns of the driving mechanism into an electric signal and sending the electric signal to the control unit; when the counted number of the rotation turns corresponding to the distance of the second pipe body extending out of the first pipe body is equal to the preset stop rotation turns, the second pipe body is located at a preset position;

the sensor of the second in-place detection mechanism is arranged on the first pipe body, the sensing unit of the second in-place detection mechanism is arranged on the second pipe body, the sensor of the second in-place detection mechanism is used for sensing the sensing unit, and when the sensor of the second in-place detection mechanism senses the sensing unit, the second pipe body is located at a preset position.

2. The boom structure of a fluid delivery device of claim 1, wherein the drive mechanism comprises: the rotary body, the connecting assembly and the power source;

the rotator is provided with threads, the second pipe is provided with threads relative to the wall of the first pipe body, the threads of the second pipe body are matched with the threads of the rotator, the connecting assembly is used for fixing the rotator and the first pipe body in an axial direction, the rotator can rotate around the rotation center of the rotator, and the power source is used for driving the rotator to rotate around the rotation center of the rotator.

3. The boom structure of a fluid conveying device according to claim 2, wherein the power source is a rotating worm wheel and a worm, the worm is disposed on one side of the rotating worm wheel, the rotating worm wheel is fixedly connected to the rotating body, and the worm is engaged with the rotating worm wheel.

4. The boom structure of a fluid conveying device according to claim 1, wherein the first in-place detection mechanism is a rotation angle acquisition sensor;

the driving mechanism comprises a rotating body and a power source, the second pipe body is provided with threads relative to the wall of the first pipe body, the rotating body is provided with threads, the threads of the second pipe body are matched with the threads of the rotating body, and the rotating body can rotate around the rotation center of the rotating body; the power source drives the rotating body to rotate, so that the second pipe body generates axial relative motion relative to the first pipe body;

the rotation angle acquisition sensor is arranged on the power source or the rotating body, and the signal input end of the rotation angle acquisition sensor is connected with the rotating shaft or the rotating body in the power source.

5. The boom structure of the fluid conveying device according to claim 4, wherein the power sources are a rotary worm gear and a worm, and a rotating shaft in the driving mechanism is a worm; the worm is arranged on one side of the rotating worm wheel, the rotating worm wheel is fixedly connected with the rotating body, and the worm is meshed with the rotating worm wheel; and the signal input end of the rotation angle acquisition sensor is connected with the worm.

6. The boom structure of a fluid conveying device according to claim 1, wherein the second tube is telescopically disposed at one end of the first tube, the second tube is provided with a guide groove relative to a wall of the first tube, a guide block is fixedly disposed on a wall of the first tube relative to the second tube, the guide block is disposed in the guide groove, and the guide groove slides on the guide block.

7. The boom structure of a fluid conveying device according to claim 6,

the first pipe body is provided with a through hole penetrating through the wall, the through hole is arranged above the guide groove, and the through hole is used for accommodating the sensor; the sensing induction units are located in the guide grooves, and the sensing induction units are located at two ends of the guide grooves.

8. The boom structure of a fluid delivery device of claim 7, wherein the sensor is an infrared sensor.

9. The boom structure of a fluid conveying device according to claim 7, wherein the sensing unit is a limiting groove.

10. The boom structure of a fluid conveying device according to claim 6, further comprising a brake unit; the braking units are arranged at two end parts of the guide groove and used for blocking the guide block to prevent the guide block from sliding out of the guide groove;

when the braking unit touches the guide block, the control unit acquires the increase of the torque force through the torque sensor, and the second pipe body is located at a preset position.

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