CN113022823A

CN113022823A - Underwater multipurpose walking stick

Info

Publication number: CN113022823A
Application number: CN202110326706.7A
Authority: CN
Inventors: 吕明朋; 毛冠煜; 段立超; 黄河
Original assignee: Diamond Energy Technology Shanghai Co ltd
Current assignee: Diamond Energy Technology Shanghai Co ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-06-25
Anticipated expiration: 2041-03-26
Also published as: CN113022823B

Abstract

The invention relates to the technical field of underwater equipment, and particularly discloses an underwater multipurpose crutch which comprises a crutch body, a sonar component, an earphone component and a battery, wherein the crutch body comprises a supporting part and a holding handle, and the holding handle is arranged at one end of the supporting part; the sonar component is arranged between the supporting part and the holding handle and used for sending sound wave signals and receiving back sound signals; the earphone component is arranged on the armrest handle, and the echo signal received by the sonar component is converted into a voice signal through the conversion device and then transmitted to a diver through the earphone component; the inside of supporting part is located to the battery, and the battery is used for supplying power for sonar subassembly and earphone subassembly. The underwater multipurpose crutch helps a diver to explore a path underwater by arranging the sonar component, and signals are transmitted to the diver through the earphone component after being converted, so that the problem that the diver collides with an obstacle or falls into an ocean gully due to poor sight is avoided, and the safety of the diver is improved.

Description

Underwater multipurpose walking stick

Technical Field

The invention relates to the technical field of underwater equipment, in particular to an underwater multipurpose crutch.

Background

At present, a mud line Christmas tree installed by an offshore oil production enterprise is frequently used in a shallow sea within 30 meters, in order to enable the enterprise to effectively maintain the Christmas tree, a diver needs to slightly dive to maintain the Christmas tree, and the diving process may encounter the condition of poor sight line and easily hit obstacles or fall into an ocean gully.

Disclosure of Invention

The invention aims to: the underwater multipurpose crutch is provided to solve the problem that the sight line is poor in the diving process, so that the crutch can collide with obstacles or fall into an ocean gully.

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

the invention provides an underwater multipurpose crutch, which comprises:

the crutch comprises a crutch body, a supporting part and a handle, wherein the handle is arranged at one end of the supporting part;

the sonar component is arranged between the supporting part and the armrest handle and used for sending sound wave signals and receiving back sound signals;

the earphone component is arranged on the armrest handle, and echo signals received by the sonar component are converted into digital signals through a conversion device and then transmitted to a diver through the earphone component;

the battery, the battery is located the inside cavity of supporting part, the battery can be for the sonar subassembly power supply.

As a preferred scheme of the underwater multipurpose crutch, the underwater multipurpose crutch further comprises a recorder, and the recorder is arranged on the supporting part; the recorder is used for recording underwater activity; the recording of the recorder can be heard through the earphone assembly.

As an optimal scheme of the underwater multipurpose crutch, the underwater multipurpose crutch further comprises an illuminating lamp, the illuminating lamp is arranged between the armrest and the sonar component, and the illuminating lamp is used for underwater illumination.

As a preferred scheme of the underwater multipurpose crutch, the sonar component comprises a sonar emitter and a signal receiver; the sonar transmitter is used for sending out sound wave signals, and the signal receiver is used for receiving echo signals.

As a preferable scheme of the underwater multipurpose crutch, the underwater multipurpose crutch further comprises a depth meter, wherein the depth meter is arranged on the supporting part and is used for detecting the diving depth of the diver.

As a preferable scheme of the underwater multipurpose crutch, the underwater multipurpose crutch further comprises an alarm, and when the diving depth measured by the depth meter reaches or exceeds the preset depth, the alarm gives an alarm.

As an optimal selection scheme of the underwater multipurpose crutch, the underwater multipurpose crutch further comprises a display screen, the display screen is arranged at the front end of the armrest handle, and the display screen can display the electric quantity of the battery and the information detected by the sonar component.

As a preferable scheme of the underwater multipurpose crutch, the underwater multipurpose crutch further comprises a rubber rod and a telescopic knife, wherein the rubber rod and the telescopic knife can be selectively detachably connected to one end, far away from the armrest handle, of the supporting part.

As a preferable scheme of the underwater multipurpose crutch, the rubber rod or the telescopic knife can be in threaded connection with the supporting part.

As a preferable scheme of the underwater multipurpose crutch, the telescopic knife comprises a knife shell, a knife blade and a control assembly, wherein a stud is arranged at one end of the knife shell, and the telescopic knife is in threaded connection with the supporting part through the stud; the blade is connected with the knife shell in a sliding mode, and the control assembly can control the blade to be switched between a first position and a second position, wherein the first position is located in the knife shell completely, and the second position partially extends out of the knife shell.

The invention has the beneficial effects that:

the invention provides an underwater multipurpose crutch, which is provided with a sonar component to help a diver to explore a path in the diving process, wherein an echo signal received by the sonar component is converted into a digital signal through a conversion device and transmitted to the diver through an earphone component. The arrangement avoids the condition that the diver collides with an obstacle or falls into an ocean gully in the diving process due to poor sight, and improves the diving safety of the diver.

Drawings

FIG. 1 is a schematic view of an embodiment of an underwater multipurpose crutch;

FIG. 2 is a schematic view of a telescopic knife (with the blade in a first position) according to an embodiment of the present invention;

FIG. 3 is a schematic view of a telescopic knife (with the blade in a second position) according to an embodiment of the present invention;

fig. 4 is a cross-sectional view taken along a-a in fig. 3.

In the figure:

101. a support portion; 102. a handle bar;

21. a sonar component; 22. a pod;

3. a recorder; 4. an earphone assembly; 5. a battery; 6. an illuminating lamp; 7. a switch assembly; 8. a depth gauge; 9. an alarm; 10. a rubber rod; 11. a telescopic knife; 111. a knife housing; 1111. a chute; 1112. a first hole; 1113. a second hole; 112. a blade; 113. a pressing part; 114. a protrusion; 115. a spring; 116. a column; 12. a display screen.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

At present, sonar technology is the most commonly used for underwater communication, navigation and distance measurement can be achieved, and underwater detection and communication are achieved through electroacoustic conversion and information processing. The sonar technology is the most widely used device in water acoustics, and comprises an active type and a passive type, wherein the active sonar technology is that sonar actively emits sound waves to 'irradiate' a target, then echoes reflected by the target in water are received, and parameters of the target are determined according to echo time and echo parameters. A sonar that purposefully actively emits sound waves from the system is called an active sonar. The passive sonar technology is used for passively receiving radiation noise generated by underwater targets such as ships and warships and signals emitted by underwater acoustic equipment so as to determine the azimuth and distance of the targets. The device is developed from a simple hydrophone, listens to noise emitted by a target, judges the position and certain characteristics of the target, and is particularly suitable for devices which cannot emit sound and expose the device and need to detect the position and distance of the opposite side. At present, due to continuous progress of science and technology, sonar instruments are highly miniaturized, modularized and computerized, and the shape and the size can be changed according to the power.

Example one

As shown in fig. 1 to 4, the present embodiment provides an underwater multipurpose crutch, which includes a crutch body, a sonar component 21, a recorder 3, an earphone component 4 and a battery 5, wherein the crutch body includes a supporting portion 101 and an armrest handle 102, and the armrest handle 102 is disposed at one end of the supporting portion 101; the sonar component 21 is arranged between the supporting part 101 and the holding handle 102, and the sonar component 21 is used for sending out sound wave signals and receiving back sound signals; the recorder 3 is provided on the support portion 101; the recorder 3 is used for recording underwater activities; the recorder 3 can play back the sound generated in the whole diving process, has the function of a black box, is beneficial to analyzing the problem and solves disputes. The earphone component 4 is arranged on the armrest handle 102, the earphone component 4 can convert the echo signal received by the sonar component 21 into a voice signal through a conversion device and then transmit the voice signal to a diver, and the voice signal can be selected as the voice signal, preferably the voice signal; the earphone component 4 can listen to the recording of the recorder 3; in addition, the earphone assembly 4 can also listen to instructions from the operator on the water, illustratively, the diver listens to a short sound left, two short sounds right, three short sounds back, one long sound forward, and a continuous short sound out. Specifically, the jack of the earphone module 4 is a waterproof screw socket, and the earphone of the earphone module 4 can be placed at the ear of the diver. The battery 5 is arranged in the inner cavity of the support part 101, and the battery 5 is used for supplying power to the sonar component 21, the recorder 3 and the receiving end of the earphone component 4 with wires. Wherein, the electric quantity of battery 5 produces the alarm information of suggestion electric quantity when reducing 20%, produces the alarm information that the compulsory requirement goes out water when reducing 10%, and alarm information can be transmitted out through earphone subassembly 4 after the language information conversion. Optionally, all parts are subjected to waterproof treatment. Of course, in other embodiments, the components of the underwater multipurpose crutch may also be powered by a cable connected to a power source above the water surface and extending to the water bottom, where the cable may be powered on the one hand and may also act as a safety line to pull the diver on the other hand.

Optionally, an internal cavity in which the battery 5 is placed is sealed by a screw opening, and two grooves for distinguishing electrodes are provided in the cavity, wherein the cross-sectional area of one groove is larger than that of the other groove, the larger groove corresponds to the positive electrode of the battery 5, and the smaller groove corresponds to the negative electrode of the battery 5.

According to the embodiment, the sonar component 21 is arranged, a diver uses the sonar component 21 to explore the path in the diving process, echo signals received by the sonar component 21 are converted into voice signals through the conversion device and transmitted to the diver through the earphone component 4, the arrangement reduces or avoids the situation that the diver collides with obstacles or falls into an ocean gully due to poor underwater sight, and the safety of the diver walking in water is improved.

Further, sonar module 21 is provided between support portion 101 and armrest 102, and is convenient for sensitively controlling the direction of sound emission.

The embodiment can be used for maintenance work of the Christmas tree, and when the maintenance process is that a diver dives underwater lightly, the embodiment helps the diver to conveniently find the location of the Christmas tree and can safely return to the base.

This embodiment still is applicable to the work of searching for and rescuing under water, finds the equipment that needs the positioning device after under water when the diver, can fix the equipment that needs the location with the multipurpose walking stick under water, presses and fixed initiative sonar button, sonar subassembly 21 alright with continuous transmission, the diver can leave the positioning device. Subsequent divers can start the passive sonar to easily search for the located equipment.

The embodiment can also be used for diving projects and diving certificate qualification examinations, can play a role in safety and underwater guidance for travelers who dive for beginners, and land personnel can know the position of a diver and conduct audio commands so that a diving coach can launch to guide or rescue when necessary.

In this embodiment, optionally, the underwater multipurpose crutch further includes an illuminating lamp 6, the illuminating lamp 6 is disposed on the armrest handle 102, the illuminating lamp 6 is used for underwater illumination, and the illuminating lamp 6 is powered by the battery 5. Specifically, the illumination lamp 6 is a high-intensity lamp. On one hand, the arrangement enables a diver to view underwater beautiful scenery in a short distance when the water quality definition is high; in the second aspect, the lamp light can be used for mutual contact and partner to move forwards; in a third aspect, light may be provided for a diver to repair underwater equipment or perform search and rescue tasks.

As for sonar module 21, in the present embodiment, sonar module 21 specifically includes a sonar transmitter and a signal receiver; the sonar transmitter is used for sending out sound wave signal, and signal receiver is used for receiving the echo signal. By pressing the launch button, the sonar transmitter can emit a sound wave signal. When the sonar emitter faces the front of the travelling direction, the sound wave signals can detect the obstacle in front of the diver and the distance between the diver and the obstacle, and when the sonar emitter faces the front lower part of the travelling direction, the sound wave signals can detect whether the ground in front of the diver has a seabed gully. Alternatively, the sonar module 21 may detect a distance between the diver and an obstacle and a type of the obstacle, wherein the type of the obstacle is mainly identified by compactness of the obstacle, and the determining device is a microcomputer, and the microcomputer may determine whether the obstacle is metal, whether there is a ravine in front, and the like. In addition, the microcomputer can also complete the processing and conversion of signals, for example, converting sound wave signals into voice signals.

Optionally, sonar component 21 still includes kuppe 22, and kuppe 22 is the toper, and the parcel is located the sonar transmitter and the signal receiver outside, and the cladding is in the outside of sonar transmitter and signal receiver promptly. The air guide sleeve 22 is arranged, and is used for guiding the traveling process of the underwater multipurpose crutch in the first aspect; the second aspect can also be used for sealing of sonar transmitters and signal receivers; a third aspect for reducing noise; in the fourth aspect, sonar module 21 can be protected to emit sound waves of different powers and different frequencies clearly.

During diving, the diving depth is an important index, influenced by diving suits or other diving equipment. In order to prevent the diver from diving too deeply, in the present embodiment, the underwater multipurpose crutch preferably further comprises a depth meter 8, the depth meter 8 is disposed at an end of the support 101 away from the handle bar 102, and the depth meter 8 is used for detecting the diving depth of the diver. The device can detect the diving depth at any time, can give a prompt to a diver, and improves the diving safety of the diver. Specifically, the alarm sound is provided when the diver is diving for more than 20 meters. Wherein the depth gauge 8 may be powered by the battery 5. In addition, as a high risk work, the deeper the diving depth, the greater the risk, therefore, in this embodiment, the depth meter 8 is disposed at the end of the support portion 101 away from the armrest handle 102, so that the measured diving depth is at the position of the leg of the diver, and further the depth measured by the depth meter 8 is the position of the leg of the diver, thereby reducing the influence on the breathing system of the diver to the maximum extent.

Regarding the prompting mode, in this embodiment, optionally, the underwater multipurpose crutch further includes an alarm 9, and when the diving depth measured by the depth meter 8 reaches a preset depth, the alarm 9 gives an alarm. In this embodiment, specifically, the alarm 9 may be an alarm lamp, and the alarm lamp may transmit information through different on/off frequencies and times according to the danger level. Meanwhile, when the alarm 9 gives an alarm, the danger signal can be converted into language information through a microcomputer and then transmitted to the ears of the diver through the earphone component 4. Wherein the alarm 9 can be powered by the battery 5.

In this embodiment, the underwater multipurpose crutch further optionally includes a rubber rod 10 and a telescopic knife 11, and the rubber rod 10 and the telescopic knife 11 can be alternatively detachably connected to one end of the supporting portion 101 away from the handle 102. In a safer occasion, such as a tourism industry, the rubber rod 10 can be arranged at the front end of the supporting part 101, the depth of the underwater muddy seabed can be detected, and a support is provided for a diver to walk conveniently. When the diver is in a dangerous environment, such as the maintenance of submarine equipment, the telescopic blade 11 can be installed at the front end of the support 101 to resist the risk of water grass entanglement and biological attack.

Regarding the connection manner, in the present embodiment, the rubber rod 10 or the telescopic blade 11 can be screwed with the support portion 101. The arrangement is simple in structure, and replacement of the rubber rod 10 and the telescopic knife 11 can be conveniently completed according to different use environments.

When the telescopic knife 11 is used, the blade is exposed all the time, which threatens the user. In order that the telescopic knife 11 does not threaten the user when no danger is encountered, in this embodiment, optionally, the telescopic knife 11 includes a knife housing 111, a blade 112 and a control assembly, a stud is disposed at one end of the knife housing 111, and the telescopic knife 11 is screwed with the support portion 101 through the stud; the blades 112 are slidably connected to the housing 111, and the control assembly can control the blades 112 to switch between a first position and a second position, wherein when the blades 112 are in the first position, all the blades 112 are located in the housing 111, and when the blades 112 are in the second position, part of the blades 112 extend out of the housing 111.

Regarding the structure of the telescopic knife 11, in the embodiment, specifically, the control component includes a pressing portion 113, a spring 115 and a pillar 116, one end of the pillar 116 is fixedly disposed at one end of the blade 112 away from the knife tip, the pressing portion 113 has a blind hole, the blind hole is sleeved at the other end of the pillar 116, the spring 115 abuts between the pillar 116 and the blind hole, the spring 115 makes the pressing portion 113 away from the blade 112, a sliding slot 1111 is disposed on one side surface of the knife housing 111 along a sliding direction of the blade 112 from the first position to the second position, the pressing portion 113 can slide in the sliding slot 1111, and a first hole 1112 and a second hole 1113 penetrating through the knife housing 111 are disposed at one side of the sliding slot 1111. The pressing portion 113 includes a protrusion 114, when the blade 112 is located at the first position, the protrusion 114 is disposed through the first hole 1112, and when the blade 112 is located at the second position, the protrusion 114 is disposed through the second hole 1113.

Further, the front end of the cutting edge of the blade 112 is of an arc-shaped structure, the back of the blade 112 is of a sawtooth shape, the blade 112 is provided with a blood groove, and the blood groove enables air to be introduced into the blood groove when the blade 112 is pulled out after being inserted into a living body, so that the blade 112 can be rapidly pulled out.

When the blade 112 is used, in the process of converting the first position of the blade 112 into the second position, the pressing part 113 is pressed down to drive the protrusion 114 to move towards the direction close to the blade 112, the spring 115 is stressed to contract, when the protrusion 114 is separated from the first hole 1112, the pressing part 113 is pushed towards the direction far away from the armrest handle 102, the pressing part 113 pushes the blade 112 towards the direction far away from the armrest handle 102 through the upright post 116, when the blade 112 is located at the second position, the pressing part 113 is loosened, under the action of the spring 115, the pressing part 113 moves towards the direction far away from the blade 112, the protrusion 114 on the pressing part 113 enters the second hole 1113 to lock the blade 112 and the knife shell 111, and the blade 112 and the knife shell 111 can resist the attack of organisms such as sharks and the like, cut off fishing nets or waterweeds wound on the body, or cut off fishing nets and other windings. Of course, the method can also be applied to the task process executed in a battle state and used as an auxiliary tool for underwater operation and land assault.

The process of converting the second position of the blade 112 into the first position is similar to the process of converting the first position of the blade 112 into the second position, and is not described herein again.

In this embodiment, the depth gauge 8 is provided between the supporting portion 101 of the telescopic blade 11 and the rubber rod 10. This arrangement allows the depth gauge 8 to be used without interfering with the use of the telescopic knife 11 or the rubber rod 10. Of course, the depth gauge 8 may also be mounted at the end of the rubber rod 10 remote from the armrest handle 102. The arrangement enables the position of the depth meter 8 to be at the foot position of a diver, so that the diver can obtain an alarm signal when the foot of the diver reaches the preset diving alarm depth, and the safety of the diver is improved.

Alternatively, the charge of the battery 5 can be used for 5-10 hours, preferably 10 hours.

The underwater multipurpose crutch further comprises a switch component 7, wherein the switch component 7 comprises a main switch and a branch switch, the main switch can control the power on and off between the battery 5 and all the components, and after the main switch is turned on, the earphone component 4, the recorder 3 and the depth meter 8 are all turned on. The branch switch comprises a switch of the sonar component 21 and a switch of the illuminating lamp 6, wherein the switch of the sonar component 21 can be pressed for a long time or pressed for a long time to control the length of the sound wave. Further, the main switch and the branch switch are preferably button switches, and the waterproof structure is convenient to arrange.

The whole equipment is manufactured safely, the used water depth is within 30 meters, the equipment is suitable for various water qualities, and the manufacturing and testing water pressure is 5 kg/cm²。

Example two

This embodiment still provides a multipurpose walking stick under water, it is the same basically with embodiment one, the difference lies in, this multipurpose walking stick under water still includes display screen 12, lighting assembly is located to this display screen 12, and is located the handrail 102 front end, display screen 12 can show the electric quantity of battery 5, the information that sonar subassembly 21 surveyed, barrier information and the depth information that the degree of depth appearance 8 surveyed, install the front end at handrail 102, can not sheltered from, be convenient for observe, display screen 12 is controlled by master switch. This arrangement enables more effective delivery of various information of the present embodiment and various detected information to the diver. In this embodiment, the display 12 may be powered by the battery 5 or by a cable connected to a power source on the water surface. When the display 12 is powered by a cable connected to a power supply on the surface of the water, the battery 5 can serve as a backup power supply to prevent the cable from failing to supply power, ensuring the safety of divers.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An underwater multipurpose crutch, comprising:

the walking stick comprises a walking stick body, wherein the walking stick body comprises a supporting part (101) and a handle (102), and the handle (102) is arranged at one end of the supporting part (101);

the sonar component (21) is arranged between the supporting part (101) and the armrest handle (102), and the sonar component (21) is used for sending out sound wave signals and receiving back sound signals;

the earphone component (4), the earphone component (4) is arranged on the armrest handle (102), and echo signals received by the sonar component (21) are converted into digital signals through a conversion device and then transmitted to divers through the earphone component (4);

battery (5), battery (5) are located the internal cavity of supporting part (101), battery (5) can be for sonar subassembly (21) power supply.

2. The underwater multipurpose crutch of claim 1 further comprising a recorder (3), said recorder (3) being provided to said support (101); the recorder (3) is used for recording underwater activity; the recording of the recorder (3) can be heard through the earphone component (4).

3. The underwater multipurpose crutch of claim 1 further comprising a lighting lamp (6), wherein said lighting lamp (6) is disposed between said armrest handle (102) and said sonar module (21), and wherein said lighting lamp (6) is used for underwater lighting.

4. The underwater multi-purpose crutch of claim 1 wherein said sonar assembly (21) comprises a sonar transmitter and a signal receiver; the sonar transmitter is used for sending out sound wave signals, and the signal receiver is used for receiving echo signals.

5. The underwater multipurpose crutch of claim 1 further comprising a depth gauge (8), said depth gauge (8) being provided to said support (101), said depth gauge (8) being used to detect the diving depth of a diver.

6. The underwater multipurpose crutch of claim 5 further comprising an alarm (9), wherein the alarm (9) alarms when the diving depth measured by the depth gauge (8) reaches or exceeds a preset depth.

7. The underwater multipurpose crutch according to claim 1 further comprising a display screen (12), wherein the display screen (12) is provided at the front end of the armrest handle (102), and the display screen (12) can display the electric quantity of the battery (5) and the information detected by the sonar module (21).

8. The underwater multipurpose crutch of claim 1 further comprising a rubber stick (10) and a telescopic knife (11), wherein the rubber stick (10) and the telescopic knife (11) are alternatively detachably connected to an end of the support (101) remote from the armrest handle (102).

9. The underwater multipurpose crutch of claim 8 wherein said rubber stick (10) or said telescopic blade (11) can be screwed with said support (101).

10. The underwater multipurpose crutch of claim 9 wherein said telescopic knife (11) comprises a knife housing (111), a knife blade (112) and a control assembly, wherein one end of said knife housing (111) is provided with a stud through which said telescopic knife (11) is screwed with said support (101); the blade (112) is connected with the knife shell (111) in a sliding mode, and the control assembly can control the blade (112) to be switched between a first position and a second position, wherein the first position is located in the knife shell (111) in whole, and the second position partially extends out of the knife shell (111).