CN114808625A

CN114808625A - Pavement paving quality monitoring device

Info

Publication number: CN114808625A
Application number: CN202210555783.4A
Authority: CN
Inventors: 刘廷杰; 张韬; 陈琴琴; 邓合一; 方飞
Original assignee: Kunshan Traffic Engineering Development Center
Current assignee: Kunshan Traffic Engineering Development Center
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-07-29

Abstract

The invention relates to the technical field of pavement monitoring, and discloses a pavement paving quality monitoring device which comprises a shell, wherein a first driving shaft and a second driving shaft are respectively and rotatably arranged on two sides in the shell, driving wheels are fixedly arranged at two ends of the first driving shaft and the second driving shaft, a flatness detection mechanism is arranged on the inner wall of the bottom of the shell, a hammering mechanism and a needle insertion detection mechanism are respectively arranged in the shell and positioned on two sides of the flatness detection mechanism, the hammering mechanism is connected with the shaft wall of the first driving shaft, and the needle insertion detection mechanism is connected with the shaft wall of the second driving shaft. This road surface quality monitoring devices that paves can not only be to the roughness monitoring on road surface, can carry out quick monitoring to the structural strength and the degree of depth on road surface moreover, has improved the monitoring efficiency on road surface.

Description

Pavement paving quality monitoring device

Technical Field

The invention relates to the technical field of pavement monitoring, in particular to a pavement paving quality monitoring device.

Background

The road surface is one or more layers of road structure layers which are paved on the top surface of a roadbed by using road building materials and used for vehicles to directly run on the surface of the roadbed. A layered structure is laid on a road bed with road building materials for a vehicle to travel. Has the functions of bearing the weight of the vehicle, resisting the abrasion of wheels and keeping the road surface smooth. For this reason, the road surface is required to have sufficient strength, high stability and a certain flatness in order to reduce damage to the road surface and vehicle parts, maintain a good visual range and reduce environmental pollution. Therefore, after paving, the pavement needs to monitor the strength, the flatness and the depth of the pavement, and the index parameters of each pavement are observed, so that the pavement meets the use standard, and the pavement paving quality monitoring device can be used at the moment.

The public number is CN211346719U, and discloses a pavement quality monitoring device based on a grating sensing technology, which comprises a box body, wherein the front of the box body is provided with a first placing groove and a second placing groove, sleeves are fixedly connected inside the first placing groove and the second placing groove, supporting rods are movably connected inside the two sleeves, connecting blocks are fixedly connected at the bottom ends of the two supporting rods, one opposite sides of the two connecting blocks are rotatably connected with a rotating shaft, a roller is rotatably connected between the opposite ends of the two rotating shafts, a groove is formed in the bottom of the box body and is positioned right above the roller, a sliding plate is movably connected inside the groove, a placing transverse plate is fixedly connected inside the box body, a connecting rod is fixedly connected at the top of the sliding plate, the top end of the connecting rod penetrates through the groove and the placing transverse plate and extends to the position above the placing transverse plate, the top fixedly connected with of connecting rod places the board, the top fixedly connected with displacement sensor receiver of placing the diaphragm, the top fixedly connected with infrared emitter of placing the board.

In the scheme, the flatness of the road surface can be monitored only, the structural strength performance of the road surface cannot be monitored, and the monitoring information is fed back quickly, so that the efficiency of road surface monitoring is reduced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the pavement paving quality monitoring device, which not only can monitor the flatness of the pavement, but also can quickly monitor the structural strength of the pavement, thereby improving the monitoring efficiency of the pavement and solving the problems that the flatness of the pavement can only be monitored and the depth of the pavement and the structural strength performance of the pavement cannot be monitored in the conventional scheme.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a road surface quality monitoring devices that paves, includes the casing, the inside both sides of casing are rotated respectively and are equipped with first drive shaft and second drive shaft, the both ends of first drive shaft and second drive shaft are all fixed and are equipped with the drive wheel, the bottom inner wall of casing is equipped with roughness detection mechanism, the inside of casing just is located roughness detection mechanism's both sides are equipped with hammering mechanism and needle respectively and insert detection mechanism, hammering mechanism with the axle wall connection of first drive shaft, needle insert detection mechanism with the axle wall connection of second drive shaft.

The flatness detection mechanism comprises a storage battery, an alarm, a first electrode plate, a second electrode plate, a third electrode plate and a fourth electrode plate, a support frame is fixedly arranged on the inner wall of the bottom of the shell, a moving rod is vertically and slidably arranged in the support frame, a first fixing ring and a second fixing ring are respectively fixedly arranged on the upper side and the lower side of the rod wall of the moving rod, a spring is sleeved on the rod wall of the moving rod, and the two ends of the spring are respectively and fixedly connected with the support frame and the second fixed ring, the first electrode plate is fixedly arranged at the top of the first fixed ring, the second electrode plate is fixedly arranged on the inner side wall of the shell, the first electrode plate and the second electrode plate are arranged in an aligned position, the third electrode plate is fixedly arranged at the bottom of the second fixing ring, the fourth electrode plate is fixedly arranged on the inner side wall of the shell, and the third electrode plate and the fourth electrode plate are arranged in an aligned mode.

Preferably, a closed loop is formed among the first electrode plate, the second electrode plate, the storage battery and the alarm through first conducting wires, and a closed loop is formed among the third electrode plate, the fourth electrode plate, the storage battery and the alarm through second conducting wires.

Preferably, the lower end of the moving rod extends to the bottom of the shell, and the lower end of the moving rod is rotatably provided with a roller.

Preferably, the hammering mechanism comprises a first belt pulley, a second belt pulley, a first belt, a rotating cylinder, a first connecting rod, a pushing rod and a hammer ball, the first belt pulley is fixedly arranged on the shaft wall of the first driving shaft, a first rotating shaft is fixedly arranged on the inner wall of the second belt pulley, the second belt pulley is rotatably arranged on the inner side wall of the shell through the first rotating shaft, the first belt pulley and the second belt pulley are in transmission connection through the first belt, the rotating cylinder is fixedly arranged on the shaft wall of the first rotating shaft, a first sleeve is fixedly arranged on the inner side wall of the shell and below the rotating cylinder, the pushing rod is vertically and slidably arranged in the first sleeve, the first connecting rod is rotatably arranged at the upper end of the pushing rod, and a clamping rod is fixedly arranged at one end of the first connecting rod, which is far away from the pushing rod, the fixed fixture block that is equipped with multiunit evenly distributed of inside wall of rotatory section of thick bamboo, but the joint of the one end of kelly sets up in every group between the fixture block, the fixed fixing base that is equipped with of lower extreme of catch bar, the hammer ball be evenly distributed fixed set up in the bottom of fixing base, and the hammer ball extends to the bottom of casing.

Preferably, the number of the clamping blocks in each group is two, the distance between the two clamping blocks is matched with the diameter of the clamping rod, and one side, far away from the clamping rod, of each clamping block is provided with an arc-shaped surface.

Preferably, the pincushion detection mechanism includes a third belt pulley, a fourth belt pulley, a second belt, a rotary disk, a second connecting rod and an inserted link, the third belt pulley is fixedly arranged on the shaft wall of the second driving shaft, a second rotating shaft is fixedly arranged on the inner side wall of the fourth belt pulley, the fourth belt pulley is rotatably arranged in the casing through the second rotating shaft, the third belt pulley and the fourth belt pulley are connected through the second belt in a transmission manner, the rotary disk is fixedly arranged on the shaft wall of the second rotating shaft, a second sleeve is fixedly arranged on the inner side wall of the casing and below the rotary disk, the inserted link is inserted in the second sleeve, the second connecting rod is rotatably arranged at the upper end of the inserted link, the other end of the second connecting rod is rotatably connected with the side edge of the rotary disk, and the lower end of the inserted link extends to the bottom of the casing, the inside wall of casing is installed controller and wireless signal module.

(III) advantageous effects

Compared with the prior art, the invention provides a pavement paving quality monitoring device, which has the following beneficial effects:

1. the pavement paving quality monitoring device is characterized in that a shell is driven by a driven driving wheel, and the roller at the lower end of a movable rod moves on a pavement at the moment; when the road surface is flat, the first electrode plate and the second electrode plate on the movable rod cannot be in contact with the second electrode plate and the fourth electrode plate; when the road surface is uneven, the corresponding first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate are in contact with each other and enable the storage battery to be connected with a power supply of the alarm, and therefore the rapid alarming action is achieved.

2. The pavement paving quality monitoring device comprises a first belt pulley, a second belt pulley, a first belt, a rotary cylinder, a first connecting rod, a push rod, a hammer ball, a first rotating shaft, a first sleeve, a clamping rod, a clamping block and a fixed seat, wherein when a shell is driven by a driving wheel, a first driving shaft can also rotate, the first driving shaft drives the first belt pulley to rotate, the first belt pulley drives the second belt pulley to rotate through the first belt, the rotary cylinder can rotate, the end part of the clamping rod can be clamped through one group of clamping blocks when the rotary cylinder rotates, so that one end of the first connecting rod can be driven to move upwards, the push rod is lifted upwards, the clamping block is moved to a certain height, the clamping rod can automatically separate from the inside of the clamping block, the hammer ball on the fixed seat can automatically fall on the pavement and hammer, the deformation degree of the pavement can be observed, and the rotary cylinder can continuously rotate, and the clamping rod can be lifted upwards by a plurality of groups of clamping blocks inside the rotary cylinder without stopping, so that the reciprocating circulation hammering road surface can be realized, and the strength detection can be carried out on the long-distance road surface.

3. This road surface quality monitoring devices that paves, third belt pulley through being equipped with, the fourth belt pulley, the second belt, the second connecting rod, the inserted bar, the second pivot, the rotary disk, the second sleeve pipe, displacement sensor, controller and wireless signal module, the casing is when being driven by the drive wheel, the rotation also can take place for the second drive shaft, the second drive shaft drives the third belt pulley and rotates, the third belt pulley drives the fourth belt pulley through the second belt and rotates, can make the rotary disk rotate, the rotary disk can stimulate the one end swing of second connecting rod, thereby can make the inserted bar reciprocating motion from top to bottom, make the inserted bar contact with the road surface repeatedly, thereby can detect the structural strength on road surface.

Drawings

Fig. 1 is a schematic structural diagram of a pavement paving quality monitoring device provided by the invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is an enlarged view of a portion B of FIG. 1;

fig. 4 is a schematic structural view of the hammer ball in fig. 1.

In the figure: the automatic alarm device comprises a shell 1, a first driving shaft 2, a second driving shaft 3, a driving wheel 4, a storage battery 5, an alarm 6, a first electrode plate 7, a second electrode plate 8, a third electrode plate 9, a fourth electrode plate 10, a supporting frame 11, a movable rod 12, a first fixing ring 13, a second fixing ring 14, a spring 15, a roller 16, a first belt pulley 17, a second belt pulley 18, a first belt 19, a rotating cylinder 20, a first connecting rod 21, a push rod 22, a hammer ball 23, a first rotating shaft 24, a first sleeve 25, a clamping rod 26, a clamping block 27, a fixed seat 28, a third belt pulley 29, a fourth belt pulley 30, a second belt 31, a second connecting rod 32, an insertion rod 33, a second rotating shaft 34, a rotating disk 35, a second sleeve 36, a wireless signal module 37 and a controller 38.

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.

Referring to fig. 1-2, a pavement paving quality monitoring device comprises a housing 1, wherein a first driving shaft 2 and a second driving shaft 3 are respectively rotatably arranged on two sides of the interior of the housing 1, driving wheels 4 are fixedly arranged at two ends of the first driving shaft 2 and the second driving shaft 3, a flatness detection mechanism is arranged on the inner wall of the bottom of the housing 1, the flatness detection mechanism comprises a storage battery 5, an alarm 6, a first electrode plate 7, a second electrode plate 8, a third electrode plate 9 and a fourth electrode plate 10, a support frame 11 is fixedly arranged on the inner wall of the bottom of the housing 1, a movable rod 12 is vertically slidably arranged in the support frame 11, the lower end of the movable rod 12 extends to the bottom of the housing 1, and a roller 16 is rotatably arranged at the lower end of the movable rod 12, so that the friction resistance of the movable rod 12 contacting with a pavement can be reduced; a first fixing ring 13 and a second fixing ring 14 are respectively fixed on the upper and lower sides of the rod wall of the movable rod 12, a spring 15 is sleeved on the rod wall of the movable rod 12, and spring 15's both ends respectively with support frame 11 and the solid fixed ring 14 fixed connection of second, first electrode piece 7 is fixed to be set up in the top of first solid fixed ring 13, second electrode piece 8 is fixed to be set up on casing 1's inside wall, first electrode piece 7 and second electrode piece 8 are the position and align the setting, third electrode piece 9 is fixed to be set up in the solid fixed ring 14's of second bottom, fourth electrode piece 10 is fixed to be set up on casing 1's inside wall, third electrode piece 9 and fourth electrode piece 10 are the position and align the setting, first electrode piece 7, second electrode piece 8, constitute closed circuit through first wire between battery 5 and the alarm 6, third electrode piece 9, fourth electrode piece 10, constitute closed circuit through the second wire between battery 5 and the alarm 6.

Referring to fig. 1 and 3-4, a hammering mechanism is disposed inside the housing 1 and on one side of the flatness detection mechanism, the hammering mechanism is connected to the shaft wall of the first driving shaft 2, the hammering mechanism includes a first belt pulley 17, a second belt pulley 18, a first belt 19, a rotating cylinder 20, a first connecting rod 21, a pushing rod 22 and a hammer ball 23, the first belt pulley 17 is fixedly disposed on the shaft wall of the first driving shaft 2, the inner wall of the second belt pulley 18 is fixedly provided with a first rotating shaft 24, the second belt pulley 18 is rotatably disposed on the inner side wall of the housing 1 through the first rotating shaft 24, the first belt pulley 17 and the second belt pulley 18 are in transmission connection through the first belt 19, the rotating cylinder 20 is fixedly disposed on the shaft wall of the first rotating shaft 24, a first sleeve 25 is fixedly disposed on the inner side wall of the housing 1 and below the rotating cylinder 20, the pushing rod 22 is vertically slidably disposed inside the first sleeve 25, rotation of first connecting rod 21 sets up in the upper end of catch bar 22, the fixed kelly 26 that is equipped with of one end that catch bar 22 was kept away from to first connecting rod 21, the fixed fixture block 27 that is equipped with multiunit evenly distributed of inside wall of rotatory section of thick bamboo 20, but the one end joint of kelly 26 sets up between every group fixture block 27, every group fixture block 27 figure is two, the interval of two fixture blocks 27 cooperatees with the diameter of kelly 26, the arcwall face setting is adopted to one side that the kelly 26 was kept away from to fixture block 27, the fixed fixing base 28 that is equipped with of lower extreme of catch bar 22, hammer ball 23 is evenly distributed's fixed the setting in the bottom of fixing base 28, and hammer ball 23 extends to the bottom of casing 1.

Referring to fig. 1, a pin insertion detection mechanism is disposed inside the housing 1 and at one side of the flatness detection mechanism, the pin insertion detection mechanism includes a third belt pulley 29, a fourth belt pulley 30, a second belt 31, a rotating disc 35, a second connecting rod 32 and an insertion rod 33, the third belt pulley 29 is fixedly disposed on the shaft wall of the second driving shaft 3, a second rotating shaft 34 is fixedly disposed on the inner side wall of the fourth belt pulley 30, the fourth belt pulley 30 is rotatably disposed inside the housing 1 via the second rotating shaft 34, the third belt pulley 29 and the fourth belt pulley 30 are in transmission connection via the second belt 31, the rotating disc 35 is fixedly disposed on the shaft wall of the second rotating shaft 34, a second sleeve 36 is fixedly disposed on the inner side wall of the housing 1 and below the rotating disc 35, the insertion rod 33 is inserted inside the second sleeve 36, the second connecting rod 32 is rotatably disposed at the upper end of the insertion rod 33, and the other end of the second connecting rod 32 is rotatably connected with the side edge of the rotating disc 35, the lower end of the insertion rod 33 extends to the bottom of the housing 1, and the controller 38 and the wireless signal module 37 are installed on the inner side wall of the housing 1.

In summary, in the pavement paving quality monitoring device, when the housing 1 is driven by the driven wheel 4, the roller 16 at the lower end of the movable rod 12 moves on the pavement; when the road surface is flat, the first electrode plate 7 and the second electrode plate 9 on the movable rod 12 cannot be in contact with the second electrode plate 8 and the fourth electrode plate 10; when the road surface protrudes upwards, the moving rod 12 is jacked by the protruding part of the road surface, so that the first electrode plate 7 is contacted with the second electrode plate 8, the power supply of the storage battery 5 and the alarm 6 is connected, and the rapid alarming action is realized; when the road surface is concave, the external force applied to the moving rod 12 by the spring 15 makes the third electrode plate 9 and the fourth electrode plate 10 contact, so that the power supply of the storage battery 5 and the alarm 6 is switched on, and the rapid alarm action is realized. When the shell 1 is driven by the driving wheel 4, the first driving shaft 2 will also rotate, the first driving shaft 2 drives the first belt pulley 17 to rotate, the first belt pulley 17 drives the second belt pulley 18 to rotate through the first belt 19, so as to enable the rotary drum 20 to rotate, when the rotary drum 20 rotates, the end of the clamping rod 26 will be clamped by one of the clamping blocks 27, so as to drive one end of the first connecting rod 21 to move upwards, and simultaneously lift the push rod 22 upwards, when the block 27 moves to a certain height, the block rod 26 will automatically break away from the block 27, at this time, the hammer ball 23 on the fixing seat 28 will automatically fall and hammer on the road surface, observe the deformation degree of the road surface at this time, because the rotary cylinder 20 is continuously rotated, and the plurality of groups of clamping blocks 27 in the rotary cylinder 20 continuously lift the clamping rods 26 upwards, thereby can realize reciprocating cycle's hammering road surface, can carry out intensity detection to long distance road surface. When the housing 1 is driven by the driving wheel 4, the second driving shaft 3 can also rotate, the second driving shaft 3 drives the third belt pulley 29 to rotate, the third belt pulley 29 drives the fourth belt pulley 30 to rotate through the second belt 31, the rotating disc 35 can rotate, the rotating disc 35 can pull one end of the second connecting rod 32 to swing, the inserting rod 33 can move up and down in a reciprocating mode, the inserting rod 33 can repeatedly contact with the road surface, and therefore the structural strength of the road surface can be detected.

It should be noted that the term "comprises/comprising" or any other variation thereof is 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

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 utility model provides a road surface paves quality monitoring device, includes casing (1), its characterized in that: the inside both sides of casing (1) are rotated respectively and are equipped with first drive shaft (2) and second drive shaft (3), the both ends of first drive shaft (2) and second drive shaft (3) are all fixed and are equipped with drive wheel (4), the bottom inner wall of casing (1) is equipped with roughness detection mechanism, the inside of casing (1) just is located roughness detection mechanism's both sides are equipped with hammering mechanism and needle respectively and insert detection mechanism, hammering mechanism with the axle wall connection of first drive shaft (2), needle insert detection mechanism with the axle wall connection of second drive shaft (3).

2. The road paving quality monitoring device of claim 1, characterized in that: the flatness detection mechanism comprises a storage battery (5), an alarm (6), a first electrode plate (7), a second electrode plate (8), a third electrode plate (9) and a fourth electrode plate (10), a support frame (11) is fixedly arranged on the inner wall of the bottom of the shell (1), a moving rod (12) is vertically arranged in the support frame (11) in a sliding mode, a first fixing ring (13) and a second fixing ring (14) are fixedly arranged on the upper side and the lower side of the rod wall of the moving rod (12) respectively, a spring (15) is sleeved on the rod wall of the moving rod (12), two ends of the spring (15) are fixedly connected with the support frame (11) and the second fixing ring (14) respectively, the first electrode plate (7) is fixedly arranged at the top of the first fixing ring (13), the second electrode plate (8) is fixedly arranged on the inner side wall of the shell (1), and the first electrode plate (7) and the second electrode plate (8) are arranged in an aligned mode, the third electrode piece (9) is fixedly arranged at the bottom of the second fixing ring (14), the fourth electrode piece (10) is fixedly arranged on the inner side wall of the shell (1), and the third electrode piece (9) and the fourth electrode piece (10) are arranged in an aligned mode.

3. The road paving quality monitoring device of claim 2, characterized in that: constitute closed circuit through first wire between first electrode piece (7), second electrode piece (8), battery (5) and alarm (6), constitute closed circuit through the second wire between third electrode piece (9), fourth electrode piece (10), battery (5) and alarm (6).

4. The road paving quality monitoring device of claim 2, characterized in that: the lower end of the moving rod (12) extends to the bottom of the shell (1), and a roller (16) is rotatably arranged at the lower end of the moving rod (12).

5. The road paving quality monitoring device of claim 1, characterized in that: the hammering mechanism comprises a first belt pulley (17), a second belt pulley (18), a first belt (19), a rotating cylinder (20), a first connecting rod (21), a push rod (22) and a hammer ball (23), wherein the first belt pulley (17) is fixedly arranged on the shaft wall of the first driving shaft (2), a first rotating shaft (24) is fixedly arranged on the inner wall of the second belt pulley (18), the second belt pulley (18) is rotatably arranged on the inner side wall of the shell (1) through the first rotating shaft (24), the first belt pulley (17) is in transmission connection with the second belt pulley (18) through the first belt (19), the rotating cylinder (20) is fixedly arranged on the shaft wall of the first rotating shaft (24), the inner side wall of the shell (1) is positioned below the rotating cylinder (20) and is fixedly provided with a first sleeve (25), the push rod (22) is vertically slidably arranged in the first sleeve (25), the rotation of first connecting rod (21) set up in the upper end of catch bar (22), keep away from first connecting rod (21) the fixed kelly (26) that is equipped with of one end of catch bar (22), the fixed fixture block (27) that are equipped with multiunit evenly distributed of the inside wall of rotatory section of thick bamboo (20), but the one end joint of kelly (26) sets up in every group between fixture block (27), the fixed fixing base (28) that is equipped with of lower extreme of catch bar (22), hammer ball (23) be evenly distributed fixed set up in the bottom of fixing base (28), and hammer ball (23) extend to the bottom of casing (1).

6. The road paving quality monitoring device of claim 5, wherein: the number of each group of the clamping blocks (27) is two, the distance between the two clamping blocks (27) is matched with the diameter of the clamping rod (26), and one side, far away from the clamping rod (26), of each clamping block (27) is provided with an arc-shaped surface.

7. The road paving quality monitoring device of claim 1, characterized in that: the needle insertion detection mechanism comprises a third belt pulley (29), a fourth belt pulley (30), a second belt (31), a rotating disc (35), a second connecting rod (32) and an insertion rod (33), wherein the third belt pulley (29) is fixedly arranged on the shaft wall of the second driving shaft (3), a second rotating shaft (34) is fixedly arranged on the inner side wall of the fourth belt pulley (30), the fourth belt pulley (30) is rotatably arranged inside the shell (1) through the second rotating shaft (34), the third belt pulley (29) and the fourth belt pulley (30) are in transmission connection through the second belt (31), the rotating disc (35) is fixedly arranged on the shaft wall of the second rotating shaft (34), a second sleeve (36) is fixedly arranged on the inner side wall of the shell (1) and below the rotating disc (35), and the insertion rod (33) is inserted into the second sleeve (36), second connecting rod (32) rotate set up in the upper end of inserted bar (33), and the other end of second connecting rod (32) with the side edge of rotary disk (35) rotates and is connected, the lower extreme of inserted bar (33) extends to the bottom of casing (1), controller (38) and wireless signal module (37) are installed to the inside wall of casing (1).