CN112315812A

CN112315812A - Nutrition feeding pump

Info

Publication number: CN112315812A
Application number: CN202011231524.3A
Authority: CN
Inventors: 俞群; 林吒吒; 朱君明
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-02-05
Anticipated expiration: 2040-11-06
Also published as: CN112315812B

Abstract

The invention discloses a nutrition feeding pump, and relates to the technical field of nasal feeding devices; the device comprises a cylinder body for containing food, a piston connected in the cylinder body in a sliding manner, a power mechanism for driving the piston to move, an end cover detachably connected at one end of the cylinder body, a discharge hole positioned on the end cover, an insertion pipe connected with the discharge hole, and a pressure sensor for monitoring the pressure of the food in the cylinder body; the pressure sensor is connected with the power mechanism. The invention provides a nutrition feeding pump, which can automatically stop injection when the esophagus pressure rises, thereby improving the safety.

Description

Nutrition feeding pump

Technical Field

The invention belongs to the technical field of nasal feeding devices, and particularly relates to a nutrition feeding pump.

Background

The nasal feeding is needed for some patients clinically, the current method is that meal is put in an injector and then injected into the stomach through the nose, and medical care personnel continue to inject the meal due to the fact that the injection is carried out in a manual pushing mode when the patient has cough, hiccup, vomit and other events which can cause the pressure of the esophagus to rise, and safety accidents are caused.

Disclosure of Invention

The object of the present invention is to overcome the above mentioned drawbacks of the prior art by providing a feeding pump which automatically stops the injection when the esophageal pressure rise event occurs, thereby improving safety.

In order to achieve the purpose, the invention adopts the following technical scheme:

a nutrition feeding pump comprises a cylinder body for containing food, a piston connected in the cylinder body in a sliding manner, a power mechanism for driving the piston to move, an end cover detachably connected to one end of the cylinder body, a discharge hole positioned on the end cover, an insertion pipe connected with the discharge hole, and a pressure sensor for monitoring the pressure of the food in the cylinder body; the pressure sensor is connected with the power mechanism.

Preferably, the piston is connected with a piston rod; the power mechanism comprises an electric cylinder for pushing the piston rod and a plurality of connecting rods which are connected with the electric cylinder and used for connecting the cylinder body; one end of the cylinder body, which is far away from the end cover, is provided with a flange which is turned outwards; the connecting rod is used for supporting a bending section of the flanging, and the bending section is abutted against one side of the flanging, which is close to the end cover.

As preferred, the electricity jar outside is equipped with a plurality of guide ways, connecting rod sliding connection is in the guide way, the guide way inboard is equipped with spacing spout, sliding connection has the stopper in the spacing spout, stopper and corresponding connecting rod rigid coupling.

Preferably, the discharge hole is provided with an electromagnetic valve; the end cover is provided with a turntable and a first motor used for rotating the turntable, and the turntable is provided with a crushing blade.

Preferably, a rotating shaft is arranged between the rotating disc and the first motor, a one-way bearing is sleeved on the rotating shaft, a cavity is arranged in the end cover, the one-way bearing is located in the cavity and comprises an inner ring and an outer ring, the inner ring is fixedly connected with the rotating shaft, a reset spring used for resetting the outer ring is arranged in the cavity, one end of the reset spring is connected to the outer ring, the other end of the reset spring is connected to the inner wall of the cavity, a pull wire which is used for driving the rotating shaft to rotate after being pulled is wound on the outer ring, and one end, away from the outer ring, of the.

Preferably, a second rotating shaft is arranged on the rotating disc, a second one-way bearing is arranged between the second rotating shaft and the output shaft of the first motor, a plurality of blades are fixedly connected to the second rotating shaft, a rotating cavity is arranged in the end cover, the blades are located in the rotating cavity, an air inlet channel for driving the blades to rotate is arranged in the end cover, an air outlet channel for discharging airflow in the rotating cavity out of the end cover is arranged in the end cover, a plurality of cylinder wall air channels are arranged in the side wall of the cylinder body, the end cover is in threaded connection with the cylinder body, the end cover abuts against one end of the cylinder wall air channel, a connecting air channel is arranged in the end cover, the cross section of the connecting air channel is arc-shaped, one end of the connecting air channel; the cylinder body comprises a side plate and an end plate, the end cover and the end plate are positioned at two opposite ends of the side plate, and the end plate, the side plate and the piston enclose a high-pressure cavity; the power mechanism comprises a winding wheel which is rotatably connected in an end plate, a speed reducing wheel which is coaxial with the winding wheel, a driving gear which is meshed with the speed reducing wheel, a second motor which is used for rotating the driving gear, a switching rotating shaft which is fixedly connected with the driving gear, a switching wheel which is rotatably connected with the switching rotating shaft, a second rotating cavity which is positioned in the end plate and is used for accommodating the switching wheel, a second return spring which is positioned in the second rotating cavity and is used for returning the switching wheel, a damping oil layer which is positioned between the switching wheel and the switching rotating shaft, a first pressurizing air channel and a second pressurizing air channel which are positioned in the cylinder, a driving air channel which is positioned in the cylinder and is communicated with the high-pressure cavity, an annular air channel which is positioned in the cylinder, a crushing air channel which is positioned in the cylinder, an air pump which is used for pressurizing the first pressurizing air channel and; one end of the power line, which is far away from the winding wheel, is connected with the piston; one end, far away from the connecting air passage, of the cylinder wall air passage is connected with the annular air passage, one end of the crushing air passage is connected with the annular air passage, the crushing air passage and the second pressurizing air passage are separated by the switching wheel, and the driving air passage and the first pressurizing air passage are separated by the switching wheel; the switching wheel is provided with a communication hole for communicating the first pressurizing air passage with the driving air passage or the second pressurizing air passage with the crushing air passage; the outer edge of the switching wheel is provided with a limiting groove, a second limiting block used for limiting the switching wheel is arranged in the limiting groove, and the second limiting block is fixedly connected with the second rotating cavity; the pressure sensor is connected with the second motor.

The invention has the beneficial effects that: 1. the patient automatically stops injection when cough occurs; 2. can smash solid matters such as fruits and the like; 3. the meal can be stirred after the injection is stopped to prevent the meal from separating and precipitating.

Drawings

FIG. 1 is a schematic view of example 1;

FIG. 2 is a schematic view of example 2;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a schematic view of example 3;

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

FIG. 6 is a partial cross-sectional view B-B of FIG. 5;

FIG. 7 is a cross-sectional view C-C of FIG. 4;

FIG. 8 is a cross-sectional view taken along line D-D of FIG. 4;

FIG. 9 is a schematic view of the crushing blade stirring the meal after the second motor stops rotating;

FIG. 10 is an enlarged view at F of FIG. 9;

fig. 11 is a schematic view of the switching rotary shaft after being rotated by the second return spring.

In the figure: the device comprises a cylinder body 1, a piston 2, an end cover 3, a discharge hole 4, an insertion pipe 5, a pressure sensor 6, a temperature sensor 7, a piston rod 8, an electric cylinder 9, a guide groove 10, a connecting rod 11, a flange 12, a bending section 13, a limiting sliding groove 14, a limiting block 15, an electromagnetic valve 16, a rotary table 17, a crushing blade 18, a first motor 19, a rotary shaft 20, a one-way bearing 21, a cavity 22, a return spring 23, a pull wire 24, a second rotary shaft 27, a second one-way bearing 28, a blade 29, a rotary cavity 30, an air inlet channel 31, an air outlet channel 32, a cylinder wall air channel 33, a connecting air channel 34, a side plate 35, an end plate 36, a high-pressure cavity 37, a winding wheel 38, a speed reducing wheel 39, a driving gear 40, a second motor 41, a switching rotary shaft 42, a switching wheel 43, a second rotary cavity 44, a second return spring 45, a damping oil, The device comprises an annular air passage 50, a crushing air passage 51, an air pump 52, a power line 53, a limiting groove 54, a second limiting block 55 and a communication hole 56.

Detailed Description

The invention is explained in further detail below with reference to the figures and the detailed description:

example 1:

referring to fig. 1, a nutrition feeding pump comprises a cylinder 1 for containing meal, a piston 2 connected in the cylinder 1 in a sliding manner, a power mechanism for driving the piston 2 to move, an end cover 3 detachably connected at one end of the cylinder 1, a discharge port 4 positioned on the end cover 3, an insertion pipe 5 connected with the discharge port 4, a pressure sensor 6 for monitoring the pressure of the meal in the cylinder 1, and a temperature sensor 7 for monitoring the temperature of the meal in the cylinder 1; the pressure sensor 6 is connected with a power mechanism. The piston 2 is connected with a piston rod 8; the power mechanism comprises an electric cylinder 9 for pushing the piston rod 8 and a plurality of connecting rods 11 which are connected with the electric cylinder 9 and used for connecting the cylinder body 1; one end of the cylinder body 1, which is far away from the end cover 3, is provided with a flanging 12 which is turned outwards; the connecting rod 11 is used for supporting a bent section 13 of the flange 12, and the bent section 13 is abutted against one side of the flange 12 close to the end cover 3.

The electric cylinder 9 outside is equipped with a plurality of guide ways 10, connecting rod 11 sliding connection is in guide way 10, guide way 10 inboard is equipped with spacing spout 14, sliding connection has stopper 15 in the spacing spout 14, stopper 15 and the 11 rigid couplings of corresponding connecting rod.

Principle of embodiment:

the end cover 3 is taken down from the cylinder body 1, the meal is placed in the cylinder body 1, the end cover 3 is installed, the connecting rod 11 is pulled out, the bending section 13 abuts against the flanging 12, the electric cylinder 9 operates, the output shaft of the electric cylinder 9 abuts against the piston rod 8, referring to figure 1, the insertion tube 5 is inserted into the nose, then the electric cylinder 9 is pushed at a constant speed, the meal is injected into the stomach at a constant speed, when a patient coughs and the like, the pressure in the cylinder body 1 suddenly rises greatly, the pressure sensor 6 transmits a signal to the electric cylinder 9, and the electric cylinder 9 stops operating.

Example 2:

referring to fig. 2 and 3, a nutrition feeding pump comprises a barrel 1 for containing meal, a piston 2 slidably connected in the barrel 1, a power mechanism for driving the piston 2 to move, an end cover 3 detachably connected at one end of the barrel 1, a discharge port 4 positioned on the end cover 3, an insertion pipe 5 connected with the discharge port 4, a pressure sensor 6 for monitoring the pressure of the meal in the barrel 1, and a temperature sensor 7 for monitoring the temperature of the meal in the barrel 1; the pressure sensor 6 is connected with a power mechanism. The piston 2 is connected with a piston rod 8; the power mechanism comprises an electric cylinder 9 for pushing the piston rod 8 and a plurality of connecting rods 11 which are connected with the electric cylinder 9 and used for connecting the cylinder body 1; one end of the cylinder body 1, which is far away from the end cover 3, is provided with a flanging 12 which is turned outwards; the connecting rod 11 is used for supporting a bent section 13 of the flange 12, and the bent section 13 is abutted against one side of the flange 12 close to the end cover 3.

The electric cylinder 9 outside is equipped with a plurality of guide ways 10, connecting rod 11 sliding connection is in guide way 10, guide way 10 inboard is equipped with spacing spout 14, sliding connection has stopper 15 in the spacing spout 14, stopper 15 and the 11 rigid couplings of corresponding connecting rod. The discharge port 4 is provided with an electromagnetic valve 16; the end cover 3 is provided with a turntable 17 and a first motor 19 for rotating the turntable 17, and the turntable 17 is provided with a crushing blade 18.

Be equipped with pivot 20 between carousel 17 and the first motor 19, the cover is equipped with one-way bearing 21 in the pivot 20, be equipped with cavity 22 in the end cover 3, one-way bearing 21 is located cavity 22, one-way bearing 21 includes inner circle and outer lane, inner circle and the 20 rigid couplings of pivot, be equipped with the reset spring 23 that is used for reseing for the outer lane in the cavity 22, reset spring 23 one end is connected on the outer lane, the reset spring 23 other end is connected on cavity 22 inner wall, the winding has the pulling wire 24 that drives pivot 20 pivoted after the pulling on the outer lane, the one end that the outer lane was kept away from to the pulling wire 24 exposes outside end cover 3.

Principle of embodiment:

sometimes, the fruits and other solids need to be smashed and then injected into the stomach through the nose, the end cover 3 is removed, the fruits are placed into the barrel body 1, the upper end cover is installed, the electromagnetic valve 16 is closed, the rotary disc 17 rotates, the smashing blade 18 rotates to smash the fruits, the electromagnetic valve 16 is opened, and the electric cylinder 9 operates, so that the smashed fruits can be injected.

Under the action of the one-way bearing 21, the first motor 19 drives the rotating shaft 20 to rotate, and the one-way bearing 21 cannot rotate.

When no electricity is available, the first motor 19 cannot operate, the pull wire 24 is pulled, the pull wire 24 drives the one-way bearing 21 to rotate and drives the rotating shaft 20 to rotate, the return spring 23 can be twisted and loosened after being pulled, and the pull wire 24 can be wound on the outer ring again under the action of the return spring 23 for pulling next time.

Example 3:

referring to fig. 4 to 11, a nutrition feeding pump comprises a barrel 1 for containing meal, a piston 2 slidably connected in the barrel 1, a power mechanism for driving the piston 2 to move, an end cover 3 detachably connected at one end of the barrel 1, a discharge port 4 positioned on the end cover 3, an insertion pipe 5 connected with the discharge port 4, a pressure sensor 6 for monitoring the pressure of the meal in the barrel 1, and a temperature sensor 7 for monitoring the temperature of the meal in the barrel 1; the pressure sensor 6 is connected with a power mechanism. The discharge port 4 is provided with an electromagnetic valve 16; the end cover 3 is provided with a turntable 17 and a first motor 19 for rotating the turntable 17, and the turntable 17 is provided with a crushing blade 18.

A second rotating shaft 27 is arranged on the turntable 17, a second one-way bearing 28 is arranged between the second rotating shaft 27 and the output shaft of the first motor 19, a plurality of blades 29 are fixedly connected on the second rotating shaft 27, a rotating cavity 30 is arranged in the end cover 3, the blade 29 is positioned in the rotating cavity 30, an air inlet channel 31 for driving the blade 29 to rotate is arranged in the end cover 3, an air outlet channel 32 for discharging the air flow in the rotating cavity 30 out of the end cover 3 is arranged in the end cover 3, a plurality of cylinder wall air passages 33 are arranged in the side wall of the cylinder body 1, the end cover 3 is in threaded connection with the cylinder body 1, the end cover 3 is abutted against one end of the cylinder wall air passage 33, a connecting air passage 34 is arranged in the end cover 3, the cross section of the connecting air passage 34 is arc-shaped, one end of the connecting air passage 34 is communicated with the air inlet passage 31, and the other end of the connecting air passage 34 is communicated with at least one cylinder wall air passage 33; the cylinder 1 comprises a side plate 35 and an end plate 36, the end cover 3 and the end plate 36 are positioned at two opposite ends of the side plate 35, and the end plate 36, the side plate 35 and the piston 2 enclose a high-pressure cavity 37; the power mechanism comprises a winding wheel 38 rotatably connected in an end plate 36, a speed reducing wheel 39 coaxial with the winding wheel 38, a driving gear 40 meshed with the speed reducing wheel 39, a second motor 41 used for rotating the driving gear 40, a switching rotating shaft 42 fixedly connected with the driving gear 40, a switching wheel 43 rotatably connected with the switching rotating shaft 42, a second rotating cavity 44 positioned in the end plate 36 and used for accommodating the switching wheel 43, a second return spring 45 positioned in the second rotating cavity 44 and used for returning the switching wheel 43, a damping oil layer 46 positioned between the switching wheel 43 and the switching rotating shaft 42, a first pressurizing air channel 47 and a second pressurizing air channel 48 positioned in the barrel body 1, a driving air channel 49 positioned in the barrel body 1 and communicated with the high-pressure cavity 37, an annular air channel 50 positioned in the barrel body 1, a crushing air channel 51 positioned in the barrel body 1, an air pump 52 used for pressurizing the first pressurizing air channel 47 and the second pressurizing air channel 48, a pressure pump, A power wire 53 having one end wound around the winding wheel 38; the end of the power line 53 remote from the winding wheel 38 is connected to the piston 2; one end of the cylinder wall air passage 33, which is far away from the connecting air passage 34, is connected with an annular air passage 50, one end of the crushing air passage 51 is connected with the annular air passage 50, the crushing air passage 51 and the second pressurizing air passage 48 are separated by the switching wheel 43, and the driving air passage 49 and the first pressurizing air passage 47 are separated by the switching wheel 43; the switching wheel 43 is provided with a communication hole 56 for communicating the first pressurizing air channel 47 with the driving air channel 49 or the second pressurizing air channel 48 with the crushing air channel 51; a limiting groove 54 is formed in the outer edge of the switching wheel 43, a second limiting block 55 for limiting the switching wheel 43 is arranged in the limiting groove 54, and the second limiting block 55 is fixedly connected with the second rotating cavity 44; the pressure sensor 6 is connected to the second motor 41.

Principle of embodiment:

the end cover is taken down, fruits are placed into the barrel body 1, the end cover is installed, the end cover is in threaded connection with the barrel body 1, the first motor 19 drives the second rotating shaft 27 to rotate through the second one-way bearing 28, the crushing blades 18 crush the fruits, after the fruits are crushed, the electromagnetic valve 16 is opened, injection is started, when the injection is performed, the second motor 41 runs, the switching rotating shaft 42 and the driving gear 40 rotate, under the action of the damping oil layer 46, the second limiting block 55 abuts against one end of the limiting groove 54, then the switching wheel 43 stops rotating, and the switching rotating shaft 42 continues rotating, which is shown in fig. 6. At this time, the driving air passage 49 and the first pressurizing air passage 47 are communicated through the communicating hole 56, the second pressurizing air passage 48 and the crushing air passage 51 are blocked by the switching wheel 43, the air pressure in the high-pressure chamber 37 rises, the power wire 53 is tightened, the driving gear 40 drives the winding wheel 38 to rotate through the speed reducing wheel 39, the power wire 53 is slowly released, the piston 2 is slowly pushed, and the meal is slowly injected. See fig. 4 and 5.

When the pressure in the cylinder 1 suddenly rises due to coughing of a patient and the like, the pressure sensor 6 sends a signal to the second motor 41, the second motor 41 stops rotating, the power line 53 stops releasing, the piston 2 stops moving, the switching rotating shaft 42 stops rotating, the switching wheel 43 rotates by a certain angle under the action of the second return spring 45, the second limiting block 55 abuts against the other end of the limiting groove 54, as shown in fig. 11, at the moment, the second pressurizing air passage 48 is communicated with the crushing air passage 51 through the communicating hole 56, and the air flow output by the air pump 52 enters the rotating cavity 30 after passing through the cylinder wall air passage 33, the connecting air passage 34 and the air inlet passage 31, and then leaves the rotating cavity 30 from the air outlet passage 32, as shown in fig. 9. The air inlet channel 31 and the air outlet channel 32 are in a straight line which does not intersect the second rotation axis 27, and the wind from the air inlet channel 31 blows the blades 29, see fig. 7. Drive the rotation of second pivot 27, under the effect of second one-way bearing 28, the output shaft of first motor 19 can not rotate, has reduced second pivot 27 pivoted resistance greatly, and second pivot 27 drives carousel 17 and crushing blade 18 and rotates, and this just can make the meal when stopping injecting into, can slowly be stirred, lets the meal can not isolate the sediment to meal blocks up discharge gate 4 when preventing next injection.

A speed reducing wheel 39 is arranged, the radius of the speed reducing wheel 39 is larger than that of a driving gear 40, the radius of the speed reducing wheel 39 is larger than that of a winding wheel 38, and during injection, a switching rotating shaft 42 rotates fast, the winding wheel 38 rotates slowly, and the piston 2 moves slowly. When the switching rotating shaft 42 rotates at a high speed, the damping between the switching wheel 43 and the switching rotating shaft 42 is large, and the damping oil layer 46 can be made of substances with large viscosity such as silicon oil.

Claims

1. A nutrition feeding pump is characterized by comprising a cylinder body for containing food, a piston connected in the cylinder body in a sliding manner, a power mechanism for driving the piston to move, an end cover detachably connected to one end of the cylinder body, a discharge hole positioned on the end cover, an insertion pipe connected with the discharge hole, and a pressure sensor for monitoring the pressure of the food in the cylinder body; the pressure sensor is connected with the power mechanism.

2. A nutrient feeding pump as defined in claim 1 wherein a piston rod is connected to the piston; the power mechanism comprises an electric cylinder for pushing the piston rod and a plurality of connecting rods which are connected with the electric cylinder and used for connecting the cylinder body; one end of the cylinder body, which is far away from the end cover, is provided with a flange which is turned outwards; the connecting rod is used for supporting a bending section of the flanging, and the bending section is abutted against one side of the flanging, which is close to the end cover.

3. A nutrition feeding pump as claimed in claim 2, wherein a plurality of guide grooves are provided on the outer side of the electric cylinder, the connecting rods are slidably connected in the guide grooves, a limiting sliding groove is provided on the inner side of the guide grooves, a limiting block is slidably connected in the limiting sliding groove, and the limiting block is fixedly connected with the corresponding connecting rod.

4. A nutrient feeding pump as claimed in claim 1, wherein the discharge port is provided with a solenoid valve; the end cover is provided with a turntable and a first motor used for rotating the turntable, and the turntable is provided with a crushing blade.

5. A nutrition feeding pump according to claim 4, wherein a rotating shaft is arranged between the rotary plate and the first motor, a one-way bearing is sleeved on the rotating shaft, a cavity is arranged in the end cover, the one-way bearing is positioned in the cavity, the one-way bearing comprises an inner ring and an outer ring, the inner ring is fixedly connected with the rotating shaft, a return spring for returning the outer ring is arranged in the cavity, one end of the return spring is connected to the outer ring, the other end of the return spring is connected to the inner wall of the cavity, a pull wire for driving the rotating shaft to rotate after being pulled is wound on the outer ring, and one end of the pull wire, which is far away from the outer ring.

6. A nutrition feeding pump as claimed in claim 4, wherein the rotary plate is provided with a second rotary shaft, a second one-way bearing is arranged between the second rotating shaft and the output shaft of the first motor, a plurality of blades are fixedly connected to the second rotating shaft, a rotating cavity is arranged in the end cover, the blades are positioned in the rotating cavity, an air inlet channel for driving the blades to rotate is arranged in the end cover, an air outlet channel for discharging the air flow in the rotating cavity out of the end cover is arranged in the end cover, a plurality of cylinder wall air passages are arranged in the side wall of the cylinder body, the end cover is in threaded connection with the cylinder body, the end cover is abutted against one end of the cylinder wall air passage, a connecting air passage is arranged in the end cover, the cross section of the connecting air passage is arc-shaped, one end of the connecting air passage is communicated with the air inlet channel, and the other end of the connecting air passage is communicated with at least one cylinder wall air passage; the cylinder body comprises a side plate and an end plate, the end cover and the end plate are positioned at two opposite ends of the side plate, and the end plate, the side plate and the piston enclose a high-pressure cavity; the power mechanism comprises a winding wheel which is rotatably connected in an end plate, a speed reducing wheel which is coaxial with the winding wheel, a driving gear which is meshed with the speed reducing wheel, a second motor which is used for rotating the driving gear, a switching rotating shaft which is fixedly connected with the driving gear, a switching wheel which is rotatably connected with the switching rotating shaft, a second rotating cavity which is positioned in the end plate and is used for accommodating the switching wheel, a second return spring which is positioned in the second rotating cavity and is used for returning the switching wheel, a damping oil layer which is positioned between the switching wheel and the switching rotating shaft, a first pressurizing air channel and a second pressurizing air channel which are positioned in the cylinder, a driving air channel which is positioned in the cylinder and is communicated with the high-pressure cavity, an annular air channel which is positioned in the cylinder, a crushing air channel which is positioned in the cylinder, an air pump which is used for pressurizing the first pressurizing air channel and; one end of the power line, which is far away from the winding wheel, is connected with the piston; one end, far away from the connecting air passage, of the cylinder wall air passage is connected with the annular air passage, one end of the crushing air passage is connected with the annular air passage, the crushing air passage and the second pressurizing air passage are separated by the switching wheel, and the driving air passage and the first pressurizing air passage are separated by the switching wheel; the switching wheel is provided with a communication hole for communicating the first pressurizing air passage with the driving air passage or the second pressurizing air passage with the crushing air passage; the outer edge of the switching wheel is provided with a limiting groove, a second limiting block used for limiting the switching wheel is arranged in the limiting groove, and the second limiting block is fixedly connected with the second rotating cavity; the pressure sensor is connected with the second motor.