CN209881856U - Support frame - Google Patents

Abstract

An embodiment of the present disclosure discloses a bracket, including: a box body; an opening is arranged on the shell at one side of the box body; a strip-shaped sealing gasket is arranged around the opening, and a microswitch triggered by external pressure is arranged in the strip-shaped sealing gasket; the inside air extractor that triggers to bleed based on micro-gap switch that is equipped with of box, the extraction opening of air extractor locate the box inside with the opening adjacent sealed intracavity and with sealed chamber wall sealing connection, the gas vent of air extractor locate the box outside and with the shell sealing connection of box. This embodiment adopts the negative pressure principle to adsorb cell phone case, has avoided the easy problem of vibration of two support arms in the common cell phone stand, and the while preparation structure is simpler. In some embodiments, a mechanically controllable air inlet is used, and air can be introduced to eliminate the negative pressure in the sealed cavity by applying external force to the negative pressure maintaining/releasing assembly, so that the mobile phone is easy to take down, and the problem that the mobile phone is not easy to take out when power is interrupted in the prior art is solved.

Description

Support frame

Technical Field

The application relates to the field of mobile digital equipment accessories, in particular to a support.

Background

Along with the development of fixed bolster technique, relevant mainstream support mainly has two kinds of gravity support and the rack structure support that takes motor control to open and shut, and the two is fundamentally all to use two support arms to hold the cell-phone tightly in order to realize fixedly, and wherein gravity support structure is fairly simple, but two support arms vibrate easily, and rack formula support that takes the motor can press from both sides tight cell-phone at the during operation, also can not vibrate, but difficult separation after the outage, and the cell-phone is inconvenient to take out.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a support which is simple in structure and convenient to operate.

Embodiments of the present disclosure provide a stent, comprising: the box body is provided with a plurality of air inlets,

an opening is arranged on the shell at one side of the box body; a strip-shaped sealing gasket is arranged around the opening, a microswitch triggered by external pressure is arranged in the strip-shaped sealing gasket, and a transmission element of the microswitch protrudes out of the outer surface of the sealing gasket around the opening; an air extractor which adopts a microswitch to trigger air extraction is arranged in the box body; the mouth of pipe of the exhaust tube of the air pump is arranged in the sealed cavity, the mouth of pipe of the exhaust tube is in sealed connection with the wall of the sealed cavity, the sealed cavity is arranged in the box and is communicated with the opening, and the mouth of pipe of the exhaust tube of the air pump is arranged outside the box and is in sealed connection with the outer shell of the box.

In some embodiments, the interior of the sealed cavity is provided with a pressure sensor for measuring a pressure value within the sealed cavity.

In some embodiments, the stent further comprises: and the main control board is connected with the pressure sensor, and sends an air exhaust stopping instruction to the air exhauster when the acquired pressure value acquired by the pressure sensor is greater than or equal to a preset pressure threshold value.

In some embodiments, the main control board is disposed inside the box body and outside the sealed cavity.

In some embodiments, a valve and a negative pressure holding/releasing assembly are disposed on one side wall of the sealed cavity, the negative pressure holding/releasing assembly covers the valve, and the negative pressure holding/releasing assembly moves and exposes the valve to communicate the inside of the sealed cavity with the outside of the sealed cavity when receiving an external force greater than a resistance threshold.

In some embodiments, the negative pressure holding/releasing assembly includes: the valve plate is connected to the side wall of the sealing cavity by a rotating shaft, covers the valve and is used for rotating around the rotating shaft and exposing the valve when the received external force is greater than a resistance threshold value; the top of the key is arranged in the shell of the side wall of the box body, and the bottom of the key is in contact with the movable end of the valve plate and used for transmitting the external force received by the top of the key to the movable end of the valve plate.

In some embodiments, the valve plate is provided with a door closer.

In some embodiments, a door closer comprises: and the elastic piece is connected with the plate body of the valve plate and the inner wall of the side wall of the sealing cavity and is used for enabling the valve plate to cover the valve when the valve plate does not receive external force.

In some embodiments, a cross beam is disposed within the opening, and a pressure sensor and/or a micro switch is disposed on the cross beam.

In some embodiments, the strip gasket has a hollow structure.

The support comprises a box body, wherein an opening is formed in the surface of one side of the box body; a strip-shaped sealing gasket is arranged around the opening, and a microswitch triggered by external pressure is arranged in the strip-shaped sealing gasket; an air extractor which adopts a microswitch to trigger air extraction is arranged in the box body; the mouth of pipe of the exhaust tube of the air pump is arranged in the sealed cavity, the mouth of pipe of the exhaust tube is in sealed connection with the wall of the sealed cavity, the sealed cavity is arranged in the box and is communicated with the opening, and the mouth of pipe of the exhaust tube of the air pump is arranged outside the box and is in sealed connection with the outer shell of the box. This support compares in prior art, has cancelled two arms of holding tightly, adopts the negative pressure principle to adsorb cell phone case, has avoided two easy vibrating problems of support arm in the common cell phone stand.

In some embodiments, a mechanically controllable air inlet is used, and air can be introduced to eliminate the negative pressure in the sealed cavity by applying external force to the negative pressure maintaining/releasing assembly, so that the mobile phone is easy to take down, and the problem that the mobile phone is not easy to take out when power is interrupted in the prior art is solved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 shows a schematic structural view of a first embodiment of the inventive stand;

fig. 2 shows a schematic structural view of a second embodiment of the inventive stand;

fig. 3 shows a schematic structural view of a third embodiment of the inventive stand;

fig. 4 shows a schematic structural view of another angle of the third embodiment of the bracket of the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the relevant portions of the related inventions are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, there is shown a structural diagram of a first embodiment of a stand according to the present invention.

As shown in fig. 1, the stand includes a case 101. The box 101 may have various structures, such as a square, a cylinder, a polygon, and so on. An opening 102 is provided in one side housing of the case 101, the opening 102 generally facing the user. One or more openings 102 may be provided. The openings 102 may be configured in various shapes according to design requirements or user requirements, such as a heart shape, a circle shape, a square shape, a diamond shape, etc., and the housing with the plurality of openings may also form a net structure, which is not limited in this application.

Around the opening 102, a strip-shaped gasket 103 is provided. A strip gasket 103 is provided on the surface of the housing surrounding the opening for sealing a gap between the housing at the periphery of the opening and the surface of the article to be placed on the side facing the opening. When the number of the openings 102 is plural, a strip-shaped packing 103 may be provided around each of the openings 102, or a plurality of the openings 102 may be surrounded so as to provide annular strip-shaped packing 103 connected end to end. The shape of the strip gasket 103 formed around the opening 102 may be any shape, and the present application is not limited thereto.

A micro switch 104 is provided in the opening 102 to be activated by an external pressure. The actuator element of the microswitch 104 projects beyond the outer surface of the strip gasket around the opening.

The micro-switches 104 may be disposed on various structures within the openings 102 or between the openings 102, such as beams, posts, brackets, and the like.

The microswitch 104, also called a sensitive switch, is mainly composed of a transmission element and an action reed, wherein the transmission element can be a button, a push pin, a roller and the like. External mechanical force acts on the action spring piece through a transmission element, so that the movable contact of the action spring piece is rapidly connected with or disconnected from the fixed contact, and the microswitch is switched on or switched off. The microswitch 104 has the characteristics of small contact distance, short action stroke, small pressing power and quick on-off.

An air extractor 106 which adopts a microswitch 104 to trigger air extraction is arranged inside the box body 101.

The air pump 106 is electrically connected with the micro switch 104, when the driving element of the micro switch 104 receives an external force and applies the external force to the action reed, and the action reed moves to a critical point to generate an instantaneous action, the micro switch 104 is closed, and a circuit where the micro switch 104 is located is conducted to trigger the air pump 106 to start air pumping.

When the acting force on the transmission element of the microswitch 104 is removed, the action reed generates a reverse action force, when the reverse stroke of the transmission element reaches the action critical point of the reed, the transmission element instantly finishes the reverse action, the microswitch is switched off, the control current of the air pump 106 disappears, and the air pump 106 stops pumping air.

The mouth 107 of the exhaust pipe of the air pump 106 is arranged in the sealed cavity 105, the mouth 107 of the exhaust pipe is connected with the wall of the sealed cavity 105 in a sealing manner, the sealed cavity 105 is located inside the box body and is communicated with the opening, the mouth 108 of the exhaust pipe of the air pump 106 is arranged outside the box body 101, and the mouth of the exhaust pipe is connected with the shell of the box body 101 in a sealing manner. Wherein the seal cavity 105 is a closed chamber formed when an external device presses the transmission element of the microswitch 104 and contacts the strip-shaped seal gasket 103 surrounding the opening.

When the external device presses the transmission element of the microswitch 104 and contacts the strip-shaped sealing gasket 103, the microswitch 104 is closed, and the air extractor 106 starts to extract air under the action of control current, the air in the sealing cavity 105 sequentially passes through the pipe orifice 107 of the air extraction pipe of the air extractor 106, the air extractor 106 and the pipe orifice 108 of the exhaust pipe of the air extractor, so that the pressure value of the air in the sealing cavity 105 is continuously reduced, and negative pressure is formed.

The bracket in the above embodiment can be used for placing an external device to be fixed. These external devices to be fixed are devices comprising a surface at least one side of which is flat. For example, an electronic product such as a mobile phone or a tablet computer or other device with at least one flat surface on which a user wishes to place. The following describes a cradle in the present application by taking a mobile phone as an example.

When the mobile phone is close to the opening 102 and contacts the strip-shaped sealing gasket 103 surrounding the opening and presses the transmission element of the microswitch 104, the transmission element drives the reed of the microswitch 104 to act, the microswitch is closed, the control current passes through the air pump, and the air pump starts to pump air under the action of the control current.

The air in the sealed cavity 105 passes through the air pumping port 107 of the air pump 106, the air pump 106 and the air exhaust port 108 of the air pump in sequence under the action of the air pump 106, meanwhile, the pipe orifice 107 of the air pumping pipe of the air pump is hermetically connected with the wall of the sealed cavity 105, and the pipe orifice of the exhaust pipe of the air pump is hermetically connected with the shell of the box body 101, so that negative pressure can be effectively kept in the sealed cavity 105 to adsorb and fix the mobile phone.

When the mobile phone needs to be taken down, the external force is applied to the mobile phone to overcome the adsorption force of the negative pressure of the sealing cavity on the mobile phone, so that the mobile phone can be taken down.

In summary, in the cradle provided in the above embodiments of the present disclosure, the opening 102 is disposed on the casing on one side of the case 101, the strip-shaped sealing gasket 103 is disposed around the opening 102, the micro switch 104 is disposed in the opening 102 and responds to the pressing of the external device, and the micro switch 104 triggers the air extractor 106 inside the case 101 to extract air, so as to form a negative pressure to adsorb and fix the mobile phone, and meanwhile, the mobile phone is taken down by applying an external force when the mobile phone needs to be taken down. Therefore, the embodiment adopts the negative pressure principle to adsorb the mobile phone shell, and the mobile phone is taken down by applying external force artificially, so that the problem that two support arms in a common mobile phone support vibrate easily is avoided, and the manufacturing structure is simpler.

In some alternative implementations of the above embodiment, the strip-shaped sealing gasket 103 surrounding the opening 102 may be of a hollow structure.

In this implementation manner, by using the sealing pad 103 with a hollow structure, when the mobile phone presses the transmission element of the micro switch 104 and contacts the sealing pad 103, the transmission element drives the reed of the micro switch 104 to act, the micro switch 104 is closed, and the circuit where the micro switch 104 is located is turned on to trigger the air extractor 106 to start extracting air. Therefore, negative pressure is formed in the sealing cavity 105 and continuously increases, the adsorption mobile phone is in close contact with the sealing gasket 103, the sealing gasket 103 deforms at the moment, the contact area between the mobile phone and the sealing gasket 103 is increased, and the mobile phone is favorably and firmly adsorbed.

With further reference to fig. 2, fig. 2 shows a second embodiment of the inventive stand.

As shown in fig. 2, unlike the embodiment of fig. 1, the bracket in this embodiment may further include a pressure sensor 201 and a main control board 202.

In this embodiment, a pressure sensor 201 is disposed inside the sealed cavity 105 for measuring the pressure value inside the sealed cavity 105. The pressure sensor 201 may be disposed in the capsule 105 by a bracket, or may be disposed on any one of the sidewalls of the capsule 105. The pressure sensor 201 is a device or apparatus that can sense the pressure signal and can convert the pressure signal into a usable output electrical signal according to a certain rule.

The pressure sensor 201 is generally composed of a pressure sensitive element and a signal processing unit. The pressure-sensitive element refers to a portion of the pressure sensor 201 capable of directly sensing or responding to a measured quantity, and may include various types, such as a piezoresistive element, a pressure-volume element, and the like.

The signal processing unit refers to a part of the pressure sensor 201 that converts the measured strain sensed or responded by the pressure sensitive element into an electrical signal suitable for transmission or measurement.

Pressure sensor 201 may include various forms of sensors for measuring pressure, such as diffused silicon piezoresistive pressure sensors, semiconductor strain gage pressure sensors, piezoresistive pressure sensors, inductive pressure sensors, and the like.

In a specific embodiment, the pressure sensor may be a piezoresistive pressure sensor, which has a very low price and a high accuracy and a good linearity.

The main control board 202 may be disposed inside the case 101, and may be disposed inside or outside the sealed cavity. In one particular example, the main control board 202 may be located outside the sealed cavity.

The main control board 202 may be an integrated circuit board in the prior art or in the future development, which is not limited in this application. For example, the main control board 202 may be implemented using an integrated circuit board integrated with a CPU processor, an FPGA processor, a DSP processor, an ARM processor, or other control chips.

In one particular example, the master control board 202 may be implemented using a RK3399 development board. The main control board 202 may invoke an algorithm based on preset content, process the received information, and send a processing instruction based on the processing result.

The main control board is connected with the pressure sensor, and when the acquired pressure value acquired by the pressure sensor is greater than or equal to a preset pressure threshold value, an air exhaust stopping instruction is sent to the air exhauster. The pressure sensor is connected through the main control board, the main control board realizes analysis and judgment of data collected by the pressure sensor, and controls the air extractor to stop air extraction according to a judgment result, so that automatic control of the air extractor is realized, and the service efficiency of the air extractor is improved.

An application scenario of the cradle in this embodiment is described below with a fixed mobile phone as an example.

In the application scenario, when the mobile phone presses the transmission element of the micro switch 104 and contacts the strip-shaped sealing gasket 103 surrounding the opening 102, the transmission element drives the reed of the micro switch 104 to act, the micro switch 104 is closed, and the circuit where the micro switch 104 is located is turned on to trigger the air extractor 106 to start air extraction.

Meanwhile, the pumping port 107 and the exhaust port 108 of the air pump are respectively connected with the wall of the sealed cavity 105 and the outer shell of the box 101 in a sealing manner, so that when the air pump 106 starts pumping air, the pressure value in the sealed cavity 105 is continuously reduced, and negative pressure is formed.

The pressure sensing element of the pressure sensor 201 responds to the pressure change in the sealed cavity 105 in real time, and the signal processing unit of the pressure sensor 201 converts the pressure value acquired by the pressure sensing element in real time into an electric signal suitable for transmission or measurement and transmits the electric signal to the main control board 202.

The main control board 202 determines whether the pressure value reaches a preset pressure threshold value based on the pressure value collected by the pressure sensor 201.

When the acquired pressure value is greater than or equal to the preset pressure threshold value, the main control board 202 sends an air exhaust stopping instruction to the air exhauster 106, the air exhauster 106 stops air exhaust, and the sealed cavity 105 effectively maintains the negative pressure.

In the embodiment shown in fig. 2 of the present disclosure, the main control board 202 is adopted to control whether the air extractor 106 stops extracting air according to whether the pressure value acquired by the pressure sensor 201 reaches the threshold value, so that the automatic control of the air extractor 106 is realized, the service efficiency of the air extractor 106 is improved, and the electric energy is saved.

In some alternative implementations of the above-described embodiments, a cross beam may be disposed inside the opening 102. The cross beam may be provided with a pressure sensor 201. Alternatively or additionally, a microswitch 104 may be provided on the cross beam. In a particular embodiment, the pressure sensor 201 may be disposed on an inner surface of the beam and the micro-switch 104 may be disposed on an outer surface of the beam. The crossbeam is arranged in the opening 102 to place the pressure sensor and/or the microswitch, and meanwhile, the crossbeam is simple in structural design, stable and reliable and low in die sinking cost, so that the design of the support can be simplified, the stability of the support is improved, and the cost of the support is reduced.

It should be understood by those skilled in the art that the bracket in the embodiment corresponding to fig. 2 of the present application, which uses the pressure sensor 201 to collect the pressure value and transmit the pressure value to the main control board 202, and the main control board 202 controls whether the air extractor 106 stops extracting air according to whether the pressure value is greater than or equal to the preset threshold, is merely an exemplary description of the present application and does not represent a limitation of the present application. For example, only the pressure sensor 201 may be provided as required, and at this time, the pressure sensor 201 may provide a pressure value displayed by monitoring, and one may manually control the air extractor to stop air extraction according to the pressure value displayed by monitoring.

With further reference to fig. 3 and 4, fig. 3 and 4 illustrate a third particular embodiment of the stent of the present disclosure, respectively.

Unlike the embodiment of fig. 1 and 2, a gas gate 301 and a negative pressure maintaining/releasing member 302 may be further provided on one side wall of the sealing chamber 105.

The damper 301 is provided on one side wall of the capsule 105, and preferably, the damper may be provided on the side wall of one capsule adjacent to the opening. The air gate may be provided in various shapes such as a circle, a square, a diamond, etc., which is not limited in this application.

The negative pressure hold/release assembly 302 covers the air gate and moves and exposes the air gate 301 when receiving an external force greater than a threshold resistance to communicate between the inside of the capsule 105 and the outside of the capsule 105 to allow external air to enter the capsule 105.

The negative pressure maintaining/releasing assembly 302 may include various types of negative pressure maintaining/releasing assemblies for covering or exposing the valve, among others. For example, the negative pressure holding/releasing member 302 may be an electric negative pressure holding/releasing member including an electric button, a door opening/closing driving member, and a door body. The electric button can be arranged on the surface of the door body. The door body opening and closing driving assembly can be arranged in the door body and electrically connected with the electric button. When a user presses the electric button, the electric button is closed to trigger the door body opening and closing driving assembly to move, so that the door body opening and closing driving assembly drives the door body to be opened or closed.

The negative pressure holding/releasing assembly 302 may also be a manual negative pressure holding/releasing assembly including a door body provided with a handle. The user can open the door body or close the door body by holding the handle.

The opening and closing manner of the door body for covering or exposing the valve in the negative pressure maintaining/releasing assembly 302 may be the opening and closing manner of the door body in the prior art or the future developed technology, and the application does not limit this. For example, the door body may be opened or closed in a sliding manner, or may be opened or closed in a rotating manner.

The negative pressure maintaining/releasing assembly 302 can ensure the negative pressure state and the sealing property of the sealing cavity 105 when covering the air valve 301, so that the adsorption of the equipment is stable and reliable; when the received external force is larger than the resistance threshold value, the valve is moved and exposed, the valve is communicated with the inside of the sealed cavity 105 and the outside of the sealed cavity 105, and the negative pressure state of the sealed cavity 105 is relieved, so that the equipment is convenient to take down.

An application scenario of the cradle in this embodiment is described below with a fixed mobile phone as an example.

In the application scenario, when the mobile phone presses the transmission element of the micro switch 104 and contacts the strip-shaped sealing gasket 103 surrounding the opening 102, the transmission element drives the reed of the micro switch 104 to act, the micro switch 104 is closed, and the circuit where the micro switch 104 is located is turned on to trigger the air extractor 106 to start air extraction.

Meanwhile, the air suction port 107 and the air exhaust port 108 of the air suction machine are respectively connected with the wall of the sealed cavity 105 and the shell of the box body 101 in a sealing mode, and the negative pressure maintaining/releasing assembly 302 covers the air valve, so that when the air suction machine 106 starts to suck air, the pressure value in the sealed cavity 105 is continuously reduced to form negative pressure, and the mobile phone is tightly adsorbed on the support.

When the mobile phone needs to be taken down, a user can apply external force to the negative pressure maintaining/removing assembly 302, when the external force is larger than the resistance threshold value of the negative pressure maintaining/removing assembly 302, the negative pressure maintaining/removing assembly 302 exposes the air valve 301, external air enters the inside of the sealed cavity 105 through the air valve, the sealed cavity eliminates the negative pressure state, and the mobile phone is taken down.

This support in the application scene keeps/removes the subassembly through adopting the negative pressure for the absorption safe and reliable of equipment need not to use and embraces the arm tightly, and the structure is simpler, and it is more convenient to operate, keeps/removes the subassembly through adopting the negative pressure simultaneously, and the negative pressure state of lightening the sealed intracavity that can be swift, thereby fixed and the equipment of being fixed of taking that can convenient and fast.

In some alternative implementations of the embodiments described above in fig. 3 and 4, the negative pressure hold/release assembly 302 may include a valve plate and a button.

And the valve plate is used for covering the door plate of the valve. The plate body of the valve plate can be provided with various shapes, such as square, diamond, circle and the like, according to the shape of the valve, and the application does not limit the invention.

The valve plate is connected to the side wall of the sealed cavity 105 by a rotating shaft, covers the valve 301, and rotates around the rotating shaft and exposes the valve 301 when receiving an external force greater than a resistance threshold value.

And the top of the key is arranged in the shell on the side wall of the box body. Preferably, the tops of the keys may protrude from the surface of the housing of the side wall of the case to facilitate pressing or actuation by a user. The shape of the key top can be set into various shapes according to the requirements of users and design requirements, and the shape is not limited in the application. The bottom of the key contacts with the movable end of the valve board for transferring the external force received by the top to the movable end of the valve board. The bottom of the key may take a variety of configurations, such as a cylinder, cone, cuboid, etc.

In this optional implementation, through adopting valve board and button, can be easily keep the negative pressure state in the sealed intracavity in order to adsorb the equipment that the support is fixed to alleviate or remove the negative pressure state in the sealed intracavity when the equipment that adsorbs on the support that needs to take, thereby can convenient and fast fix and take by fixed equipment.

In some alternative implementations of the embodiments described above in fig. 3 and 4, the valve 301 plate is provided with a door closer. The door closer is used for automatically closing the door. The door closer can also protect the door frame and the door body (smooth closing). In some examples, the door closer may be a spring-like hydraulic device on the door head that can be released by compression when the door is opened, and automatically closes the door, acting like a spring door. The door closer is arranged on the valve 301 plate, so that the valve 301 can be accurately and timely closed to an initial position after being opened, and meanwhile, the door frame and the door body are effectively protected.

Alternatively, the door closer may include: and the elastic piece is connected with the plate body of the valve plate and the cavity wall of the sealing cavity and is used for enabling the valve plate to cover the valve when the valve plate does not receive external force. The elastic member accumulates elastic potential energy when the valve plate receives an external force to expose the valve 301, and releases the elastic potential energy when the external force disappears. The elastic piece can ensure that the valve plate body can be automatically closed to the initial position covering the valve 301 timely and accurately under the action of the elastic piece.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. A stent, comprising: a box body;

an opening is formed in the shell on one side of the box body;

a strip-shaped sealing gasket is arranged around the opening, a micro switch triggered by external pressure is arranged in the strip-shaped sealing gasket, and a transmission element of the micro switch protrudes out of the outer surface of the strip-shaped sealing gasket around the opening;

an air extractor which adopts the microswitch to trigger air extraction is arranged in the box body;

the mouth of pipe of the exhaust pipe of air extractor locate sealed intracavity just the mouth of pipe of exhaust pipe with sealed chamber wall sealing connection, sealed chamber is located inside and the UNICOM of box the opening, the mouth of pipe of the blast pipe of air extractor is located outside the box just the mouth of pipe of blast pipe with the shell sealing connection of box.

2. The holder according to claim 1, wherein the interior of the sealed cavity is provided with a pressure sensor for measuring a pressure value within the sealed cavity.

3. The bracket of claim 2, further comprising: and the main control board is connected with the pressure sensor, and sends an air exhaust stopping instruction to the air exhauster when the acquired pressure value acquired by the pressure sensor is greater than or equal to a preset pressure threshold value.

4. The rack of claim 3, wherein the main control board is disposed inside the box and outside the sealed cavity.

5. The holder according to any one of claims 1 or 3, wherein a gas gate and a negative pressure holding/releasing member are provided on one side wall of the sealed chamber, the negative pressure holding/releasing member covers the gas gate, and the negative pressure holding/releasing member moves and exposes the gas gate to communicate between inside and outside of the sealed chamber when receiving an external force greater than a resistance threshold.

6. The bracket of claim 5, wherein the negative pressure holding/releasing assembly comprises:

the valve plate is connected to the side wall of the sealing cavity by adopting a rotating shaft, covers the valve and is used for rotating around the rotating shaft and exposing the valve when the received external force is greater than a resistance threshold value;

the top of the key is arranged in the shell of the side wall of the box body, and the bottom of the key is in contact with the movable end of the valve plate and used for transmitting the external force received by the top of the key to the movable end of the valve plate.

7. A bracket according to claim 6, wherein the valve plate is provided with a door closer.

8. The bracket of claim 7, the door closer comprising: the elastic piece is connected with the plate body of the valve plate and the inner wall of the side wall of the sealing cavity and used for enabling the valve plate to cover the valve when the valve plate does not receive external force.

9. The bracket according to claim 2, characterized in that a cross beam is arranged in the opening, and the pressure sensor and/or the microswitch are arranged on the cross beam.

10. The bracket of claim 1, wherein the strip gasket has a hollow structure.