CN114374076A

CN114374076A - Indoor antenna angle adjustment mechanism

Info

Publication number: CN114374076A
Application number: CN202210065750.1A
Authority: CN
Inventors: 李云策; 袁惠清
Original assignee: Xi'an Ruilin Electronic Technology Co ltd
Current assignee: Xi'an Ruilin Electronic Technology Co ltd
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-04-19

Abstract

The invention provides an indoor antenna angle adjusting mechanism, which comprises a base and a cavity plate arranged on the base, wherein an antenna circuit board is fixed on the inner bottom surface of the base, a circuit touch plate electrically connected with the antenna circuit board is also fixed in the base, a moving rod is movably connected in the base, one end of the moving rod is fixed with a first thread cylinder, a first screw rod is rotatably connected in the base, the first thread cylinder is in threaded connection outside the first screw rod, the other end of the moving rod is fixed with a sleeve, the sleeve is in sliding connection outside a limiting rod, the middle of the moving rod is provided with an arc-shaped section, the arc-shaped section is movably connected with an antenna rod, the bottom end of the antenna rod is movably connected with a contact, and the contact is electrically connected with the circuit touch plate. Then finely adjust once more can, convenient and practical.

Description

Indoor antenna angle adjustment mechanism

Technical Field

The invention belongs to the technical field of indoor antenna adjusting devices, and particularly relates to an indoor antenna angle adjusting mechanism.

Background

An antenna is a transducer that converts a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium, usually free space, or vice versa. A component for transmitting or receiving electromagnetic waves in a radio device. Engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasure, remote sensing, radio astronomy and the like all use electromagnetic waves to transmit information and work by depending on antennas. In addition, in transferring energy with electromagnetic waves, non-signal energy radiation also requires antennas.

With the continuous progress of wireless communication technology, wireless communication devices are also increasingly applied to various aspects of people's lives, so the requirements on wireless communication signals are also increasingly high, but because of blocking objects such as wall surfaces, the weakening range of the wireless communication signals of a base station is large indoors, the communication effect is poor, and in order to meet the use requirements of people on the wireless communication devices indoors, antennas are usually arranged indoors to improve the strength of the indoor wireless signals.

The orientation and the angle of the existing indoor antenna can directly influence the strength of signals due to the size limitation of the existing indoor antenna, but the existing indoor antenna adjusting mechanism is relatively simple, the adjusting range and the adjusting angle are small, the normal use of the indoor antenna is influenced, the antenna angle can be adjusted through frequently moving the antenna installation position, and the popularization and the use of the indoor antenna are influenced.

Disclosure of Invention

The present invention is directed to an indoor antenna angle adjustment mechanism, which solves the above problems in the prior art.

In order to solve the technical problems, the invention adopts the technical scheme that: an indoor antenna angle adjusting mechanism comprises a base and a cavity plate arranged on the base, wherein an antenna circuit board is fixed on the inner bottom surface of the base, and a circuit touch plate electrically connected with the antenna circuit board is also fixed in the base;

a moving rod is movably connected in the base, a first threaded cylinder is fixed at one end of the moving rod, a first lead screw is rotatably connected in the base, the first threaded cylinder is in threaded connection with the outside of the first lead screw, a sleeve is fixed at the other end of the moving rod, a limiting rod is fixed in the base, and the sleeve is in sliding connection with the outside of the limiting rod;

the middle of the moving rod is provided with an arc-shaped section, an antenna rod is movably connected outside the arc-shaped section, the bottom end of the antenna rod is movably connected with a contact, and the contact is electrically connected with the circuit touch panel;

the antenna comprises a base, a cavity plate, a spherical seat, a first electric push rod, a limiting barrel, a connecting cavity, a cavity plate, a second electric push rod, a spherical seat and an antenna rod, wherein the connecting cavity is formed in the top surface of the base, the cavity plate is arranged outside the connecting cavity of the base, the first electric push rod is movably connected in the cavity plate, the other end of the first electric push rod is movably connected with the limiting barrel through the spherical seat, and the middle upper section of the antenna rod is sleeved in the limiting barrel.

Furthermore, a communicating groove is formed in the antenna rod, the arc-shaped section penetrates through the communicating groove and is movably connected with the antenna rod, an elastic rod is fixed at the bottom end of the antenna rod, the contact is fixed at the bottom end of the elastic rod, and a section of telescopic rod is fixed above the communicating groove of the antenna rod.

Furthermore, two positioning columns are fixed on the bottom sides of the moving rods, two positioning grooves are fixed on the inner ground of the base, and each positioning column is connected in the corresponding positioning groove in a sliding mode.

Furthermore, two bottom ends of one side of the cavity plate are respectively fixed with a sliding block, one side of the base corresponding to the sliding block is provided with a sliding groove, and the sliding block is connected in the sliding groove in a sliding manner.

Furthermore, a driving plate is fixed on one side of the base corresponding to the sliding groove, a second electric push rod is fixed in the driving plate, a telescopic rod of the first electric push rod is fixed at the side end of the cavity plate through a T-shaped rod, and the second electric push rod pushes the cavity plate to move and adjust on the base.

Furthermore, a cavity is formed in one side of the cavity plate, a second screw rod is connected to the cavity in a rotating mode, a second threaded cylinder is connected to the second screw rod through external threads, the first electric push rod is connected to the cavity in a sliding mode, and the outer side end of the first electric push rod is fixed to the outer side of the second threaded cylinder.

Furthermore, the straight line where the second screw rod is located is parallel to the straight line where the first screw rod is located.

Furthermore, the outer side of the second screw rod extends out of the cavity plate, a second screw rod driving mechanism is fixed on the outer side of the cavity plate, the first screw rod extends out of the base, and a first screw rod driving mechanism is fixed on the outer side of the base.

Furthermore, an opening is formed in the middle of the cavity plate, and flexible dustproof brushes are respectively stuck and fixed on two sides of the opening.

Furthermore, a limiting plate is fixed on the base on the opposite side of the driving plate, the cavity plate is connected between the driving plate and the limiting plate in a sliding mode, and heat dissipation holes are formed in two vertical sides, perpendicular to the driving plate, of the base respectively.

Compared with the prior art, the invention has the following advantages:

1. the invention is movably connected with a movable rod in a base, one end of the movable rod is fixed with a first thread cylinder, a first screw rod is rotationally connected in the base and extends to the outer side of the base, a first screw rod driving mechanism is fixed on the outer side of the base, the first screw rod can be driven to rotate through the first screw rod driving mechanism, so that the first screw rod can be driven to move, due to the action of the limiting rod and the sleeve, the movable rod can be driven by the first screw rod to move along the axial direction of the first screw rod, thereby can accomplish the activity adjustment effect of carriage release lever, the centre of carriage release lever sets up to the segmental arc, and the outer swing joint of segmental arc has the antenna mast, has seted up the intercommunication groove on the antenna mast, and the segmental arc passes swing joint between intercommunication groove and the antenna mast, and the internal diameter in intercommunication groove is greater than the external diameter of segmental arc to can satisfy the activity adjustment effect of antenna mast on the carriage release lever.

2. According to the invention, the elastic rod is fixed at the bottom end of the antenna rod, the contact is fixed at the bottom end of the elastic rod, and the contact is electrically connected with the circuit touch pad, so that the contact at the bottom end of the antenna rod can be ensured to be pressed against the circuit touch pad in the angle adjusting process under the action of the elastic rod, thereby ensuring the normal electrical connection of the antenna rod and ensuring the normal use of the telegraph pole.

3. According to the invention, the top surface of the base is provided with the communicating cavity, the cavity plate is arranged outside the communicating cavity of the base, the two bottom ends of one side of the cavity plate are respectively fixed with the sliding blocks, the sliding groove is arranged on one side of the base corresponding to the sliding block, the sliding blocks are connected in the sliding grooves in a sliding manner, the position of the cavity plate on the base can be adjusted under the action of the sliding grooves, the adjusting direction is vertical to the direction of the first screw rod, so that the antenna rod can be driven to be adjusted towards different directions in a plane, and the angle adjusting range of the antenna rod can be widened.

4. The invention is characterized in that a cavity is arranged in one side of a cavity plate, a second screw rod is rotationally connected in the cavity, a second screw thread cylinder is connected with the second screw rod through an external thread, a first electric push rod is connected in the cavity in a sliding way, the outer side end of the first electric push rod is fixed on the outer side of the second screw thread cylinder, the outer side of the second screw rod extends out of the cavity plate, a second screw rod driving mechanism is fixed on the outer side of the cavity plate, the second screw rod driving mechanism can drive the second screw rod to rotate, the second screw rod can drive the second screw thread cylinder to move in the cavity of the cavity plate through rotation, so that the first electric push rod can be driven to move in the cavity plate, a first electric push rod is movably connected in the cavity plate, the other end of the first electric push rod is movably connected with a limiting cylinder through a spherical seat, so as to drive the position adjustment of the limiting cylinder, the middle upper section of an antenna rod is sleeved in the limiting cylinder, the position adjustment of the limiting cylinder can drive the adjustment of the angle of the upper part of the antenna rod, and the limiting cylinder is matched with the moving rod at the bottom to complete the angle adjustment of the antenna rod.

5. When the antenna is used, the first lead screw driving mechanism and the second lead screw driving mechanism are used for driving the first lead screw and the second lead screw to rotate respectively, the moving rod and the first electric push rod are moved to the middle of the base respectively, the first electric push rod extends out of the telescopic rod, the limiting cylinder is ensured to be arranged at the center of the cavity plate, the antenna rod is arranged at the center of the cavity plate at the moment, and the angle of the antenna rod is vertically upward; when the inclination angle of the antenna rod needs to be adjusted along the long axis direction of the base, the second lead screw driving mechanism is started, so that the second lead screw driving mechanism drives the second lead screw to rotate, the first electric push rod is driven to move in the cavity plate, the first electric push rod deviates from the middle of the cavity plate at the moment, so that deviation can be formed between the first electric push rod and the moving rod at the bottom, the antenna rod is inclined under the self-adjusting function of the connecting spherical seat of the limiting cylinder, so that the adjustment of partial inclination angle is completed, and the specific angle of the adjustment is used according to the strength of a signal; when the inclination angle of the antenna rod needs to be adjusted along the minor axis direction of the base, the first electric push rod is started, and when the adjustment in a large range is needed, the second electric push rod can be synchronously started to adjust the position of the cavity plate, so that the adjustment in the minor axis direction of the antenna rod is completed; when the position of the antenna mast needs to be adjusted within a small range, the first lead screw driving mechanism and the second lead screw driving mechanism are started again to drive the first lead screw and the second lead screw to rotate respectively, the movable rod and the first electric push rod are moved to the position needed on the base respectively, and then fine adjustment is performed again, so that the antenna mast is convenient and practical.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an enlarged view of a structure a in fig. 1.

Fig. 3 is a top view of the internal structure of the base of the present invention.

FIG. 4 is a top view of a cavity plate structure of the present invention.

1-a base; 11-an antenna circuit board; 12-a circuit contact pad; 13-a first screw rod; 14-a limiting rod; 15-positioning grooves; 16-a chute; 17-an active plate; 2-cavity plate; 21-a slide block; 22-a second lead screw; 23-a second threaded cylinder; 24-a first electric push rod; 25-a spherical seat; 26-a dust brush; 3-moving the rod; 31-a first threaded cylinder; 32-a sleeve; 33-arc segment; 34-a positioning column; 4-an antenna mast; 41-contact; 42-a communication groove; 43-a resilient lever; and 5, a limiting cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

As shown in fig. 1 to 4, the present invention provides a technical solution: the utility model provides an indoor antenna angle adjustment mechanism, includes base 1 and the chamber board 2 of setting on base 1, be fixed with antenna circuit board 11 in the base 1 on the bottom surface, antenna circuit board 11 is current general type indoor antenna circuit structure, and for prior art, its detailed structure and principle are no longer repeated here.

The base 1 is internally and electrically connected with the antenna circuit board 11, the circuit touch panel 12 is used for providing an external touch panel for the antenna circuit board 11, and the circuit touch panel 12 is used for completing signal connection between the antenna mast 4 and the antenna circuit board 11, so that the normal use of the antenna mast 4 is completed.

Swing joint has the carriage release lever 3 in the base 1, the one end of carriage release lever 3 is fixed with a screw thread section of thick bamboo 31, the 1 internal rotation of base is connected with first lead screw 13, a screw thread section of thick bamboo 31 is outside first lead screw 13, the other end of carriage release lever 3 is fixed with sleeve 32, base 1 internal fixation has gag lever post 14, sleeve 32 sliding connection is outside gag lever post 14, first lead screw 13 extends to the 1 outside of base the base outside is fixed with a lead screw actuating mechanism, can drive first lead screw 13 through a lead screw actuating mechanism and rotate to can drive the removal of a screw thread section of thick bamboo 31 in the first lead screw 13 outside, because gag lever post 14 and sleeve 32's effect, can drive carriage release lever 3 along first lead screw 13 axial displacement through first lead screw 13, thereby can accomplish the activity adjustment effect of carriage release lever 3.

Two positioning columns 34 are fixed on the bottom sides of the moving rods 3, two positioning grooves 15 are fixed on the inner ground of the base 1, each positioning column 34 is connected in the corresponding positioning groove 15 in a sliding mode, the whole position of the moving rods 3 in the adjusting process can be stable under the action of the positioning columns 34 and the positioning grooves 15, the influence of large fluctuation on normal electric connection of the telegraph poles 4 is avoided, and the service life of the telegraph poles 4 can be prolonged.

The middle of mobile rod 3 sets up to arc section 33, arc section 33 outer swing joint has antenna mast 4, antenna mast 4 is last to have seted up intercommunication groove 42, arc section 33 passes swing joint between intercommunication groove 42 and the antenna mast 4, and the internal diameter of intercommunication groove 42 is greater than the external diameter of arc section 33 to can satisfy the activity adjustment effect of antenna mast 4 on mobile rod 3.

The bottom end of the antenna rod 4 is fixed with the elastic rod 43, the contact 41 is fixed at the bottom end of the elastic rod 43, the contact 41 is electrically connected with the circuit contact plate 12, and the contact 41 at the bottom end of the antenna rod 4 can be supported on the circuit contact plate 12 in the angle adjusting process under the action of the elastic rod 43, so that the normal electrical connection of the antenna rod 4 is ensured, and the normal use of the telegraph pole 4 is ensured.

The antenna rod 4 is fixed with a section of telescopic rod 44 above the communicating groove 42, and the telescopic rod 44 can be passively stretched, so that in the relative adjustment process of the cavity plate 2 and the base, the stability of the linear structure of the antenna rod 4 is ensured through the telescopic rod 44, and the service life of the antenna rod 4 can be prolonged.

The top surface of the base 1 is provided with a communicating cavity, the cavity plate 2 is arranged outside the communicating cavity of the base 1, and the communicating cavity is used for communicating the antenna rod 4, so that the heat dissipation effect inside the base 1 can be improved, the heat in the base can be dissipated timely, and the stable use of signals is ensured.

The two bottom ends of one side of the cavity plate 2 are respectively fixed with a sliding block 21, a sliding groove 16 is formed in one side of the base 1 corresponding to the sliding block 21, the sliding block 21 is connected in the sliding groove 16 in a sliding mode, the cavity plate 2 can be adjusted on the base 1 under the action of the sliding groove 16, the adjusting direction is perpendicular to the direction of the first screw rod 13, the antenna rod 4 can be driven to be adjusted towards different directions in a plane, and the angle adjusting range of the antenna rod 4 can be widened.

One side that corresponds with spout 16 on base 1 is fixed with driving plate 17, driving plate 17 internal fixation has second electric push rod 171, the telescopic link of second electric push rod 171 passes through the T type pole to be fixed at the side of chamber board 2, promotes the effect that chamber board 2 moved the adjustment on base 1 through second electric push rod 171.

The utility model discloses a cavity of a motor vehicle, including cavity board 2, first electric push rod 24, first lead screw 22, second lead screw 22, first electric push rod 24 sliding connection has a second screw section of thick bamboo 23, just outside end of first electric push rod 24 is fixed in the cavity, outside extension to cavity board 2 of second lead screw 22 outside, and be fixed with second lead screw actuating mechanism in the cavity board 2 outside, can drive second lead screw 22 through second lead screw actuating mechanism and rotate, and second lead screw 22 rotates and can drive second screw section of thick bamboo 23 and remove in the cavity of cavity board 2 to can drive first electric push rod 24 and remove in cavity board 2.

The utility model discloses an antenna device, including chamber board 2, first electric push rod 24, spherical seat 25 swing joint, spacing section of thick bamboo 5 is connected with in chamber board 2, and first electric push rod 24 moves in chamber board 2, the other end of first electric push rod 24 has spacing section of thick bamboo 5 through spherical seat 25 swing joint to can drive the adjustment of the position of spacing section of thick bamboo 5, the well upper segment of antenna mast 4 cup joints in spacing section of thick bamboo 5, and the adjustment of spacing section of thick bamboo 5 position can drive the adjustment of antenna mast 4 upper portion angle, mutually supports with the carriage release lever 3 of bottom and accomplishes the dog-ear angle adjustment of antenna mast 4.

In order to facilitate the multi-angle adjustment of the antenna rod 4, the straight line of the second lead screw 22 is parallel to the straight line of the first lead screw 13.

In order to avoid impurities from falling into the base 1 through the cavity plate 2, an opening is formed in the middle of the cavity plate 2, and flexible dustproof brushes 26 are respectively stuck and fixed on two sides of the opening.

In order to enable the cavity plate 2 to be used stably, a limiting plate is fixed on the base 1 on the opposite side of the driving plate 17, the cavity plate 2 is connected between the driving plate 17 and the limiting plate in a sliding mode, and heat dissipation holes are formed in two vertical sides of the base 1 perpendicular to the driving plate 17 respectively.

In summary, when in use, the first lead screw driving mechanism and the second lead screw driving mechanism are used for respectively driving the first lead screw 13 and the second lead screw 22 to rotate, the moving rod 3 and the first electric push rod 24 are respectively moved to the middle of the base 1, and the first electric push rod 24 extends out of the telescopic rod, so that the limiting cylinder 5 is ensured to be positioned at the center of the cavity plate 2, the antenna rod 4 is positioned at the center of the cavity plate 2, and the angle of the antenna rod 4 is vertically upward;

when the inclination angle of the antenna rod 4 needs to be adjusted along the long axis direction of the base 1, the second lead screw driving mechanism is started, so that the second lead screw driving mechanism drives the second lead screw 22 to rotate, the first electric push rod 24 is driven to move in the cavity plate 2, the first electric push rod 24 deviates from the middle of the cavity plate 2 at the moment, so that deviation can be formed between the first electric push rod and the moving rod 3 at the bottom, the antenna rod 4 is inclined under the self-adjusting action of the connecting spherical seat 25 of the limiting cylinder 5, and thus, the adjustment of partial inclination angle is completed, and the specific angle of the adjustment is used according to the strength of a signal;

when the inclination angle of the antenna rod 4 needs to be adjusted along the minor axis direction of the base 1, the first electric push rod 24 is started, and when the adjustment in a large range is needed, the second electric push rod 171 can be synchronously started to adjust the position of the cavity plate 2, so that the adjustment in the minor axis direction of the antenna rod 4 is completed;

when the position of the antenna rod 4 needs to be adjusted within a small range, the first lead screw driving mechanism and the second lead screw driving mechanism are started again to drive the first lead screw 13 and the second lead screw 22 to rotate respectively, the moving rod 3 and the first electric push rod 24 are moved to the position on the base 1 respectively, and then fine adjustment is performed again.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The indoor antenna angle adjusting mechanism is characterized by comprising a base (1) and a cavity plate (2) arranged on the base (1), wherein an antenna circuit board (11) is fixed on the inner bottom surface of the base (1), and a circuit touch plate (12) electrically connected with the antenna circuit board (11) is also fixed in the base (1);

a moving rod (3) is movably connected in the base (1), a first threaded cylinder (31) is fixed at one end of the moving rod (3), a first screw rod (13) is rotatably connected in the base (1), the first threaded cylinder (31) is in threaded connection with the outside of the first screw rod (13), a sleeve (32) is fixed at the other end of the moving rod (3), a limiting rod (14) is fixed in the base (1), and the sleeve (32) is in sliding connection with the outside of the limiting rod (14);

the middle of the moving rod (3) is provided with an arc-shaped section (33), the outside of the arc-shaped section (33) is movably connected with an antenna rod (4), the bottom end of the antenna rod (4) is movably connected with a contact (41), and the contact (41) is electrically connected with the circuit touch panel (12);

the antenna is characterized in that a communicating cavity is formed in the top surface of the base (1), the cavity plate (2) is arranged outside the communicating cavity of the base (1), a first electric push rod (24) is movably connected into the cavity plate (2), the other end of the first electric push rod (24) is movably connected with a limiting barrel (5) through a spherical seat (25), and the middle upper section of the antenna rod (4) is sleeved in the limiting barrel (5).

2. The indoor antenna angle adjusting mechanism of claim 1, wherein the antenna rod (4) is provided with a communicating groove (42), the arc-shaped section (33) passes through the communicating groove (42) and is movably connected with the antenna rod (4), an elastic rod (43) is fixed at the bottom end of the antenna rod (4), the contact (41) is fixed at the bottom end of the elastic rod (43), and a section of telescopic rod (44) is fixed above the communicating groove (42) of the antenna rod (4).

3. The indoor antenna angle adjusting mechanism of claim 1, wherein two positioning posts (34) are fixed on the bottom side of the moving rod (3), two positioning slots (15) are fixed on the inner ground of the base (1), and each positioning post (34) is slidably connected in the corresponding positioning slot (15).

4. The indoor antenna angle adjusting mechanism of claim 1, wherein two bottom ends of one side of the cavity plate (2) are respectively fixed with a sliding block (21), a sliding slot (16) is formed on one side of the base (1) corresponding to the sliding block (21), and the sliding block (21) is slidably connected in the sliding slot (16).

5. The indoor antenna angle adjusting mechanism of claim 4, wherein a driving plate (17) is fixed on one side of the base (1) corresponding to the sliding groove (16), a second electric push rod (171) is fixed in the driving plate (17), a telescopic rod of the second electric push rod (171) is fixed on a side end of the cavity plate (2) through a T-shaped rod, and the second electric push rod (171) pushes the cavity plate (2) to move and adjust on the base (1).

6. The indoor antenna angle adjusting mechanism of claim 1, wherein a cavity is formed in one side of the cavity plate (2), a second lead screw (22) is rotatably connected in the cavity, a second threaded barrel (23) is connected to the second lead screw (22) through an external thread, the first electric push rod (24) is slidably connected in the cavity, and an outer end of the first electric push rod (24) is fixed to the outer side of the second threaded barrel (23).

7. An indoor antenna angle adjusting mechanism according to claim 6, characterized in that the straight line of the second lead screw (22) is parallel to the straight line of the first lead screw (13).

8. The indoor antenna angle adjusting mechanism of claim 7, wherein the outside of the second lead screw (22) extends to the outside of the cavity plate (2), and a second lead screw driving mechanism is fixed on the outside of the cavity plate (2), the first lead screw (13) extends to the outside of the base (1), and a first lead screw driving mechanism is fixed on the outside of the base.

9. The indoor antenna angle adjusting mechanism of claim 1, wherein an opening is opened in the middle of the cavity plate (2), and flexible dustproof brushes (26) are respectively stuck and fixed on two sides of the opening.

10. The indoor antenna angle adjusting mechanism of claim 5, wherein a limiting plate is fixed on the base (1) at the opposite side of the active plate (17), the cavity plate (2) is slidably connected between the active plate (17) and the limiting plate, and the base (1) is respectively provided with heat dissipation holes at two vertical sides perpendicular to the active plate (17).