CN218444102U - Piezoelectric type vehicle weight detection device - Google Patents

Abstract

A piezoelectric vehicle weight detection device comprises a moving column, a base, a piezoelectric sheet, a resettable trigger mechanism and a pressure sensor, wherein the pressure sensor is used for weight detection and is electrically connected with the piezoelectric sheet; the movable column is movably assembled in the mounting hole at the top of the base, can extend into the base and can reciprocate along the vertical direction; the base is provided with a piezoelectric fixing groove for inserting a piezoelectric sheet; the piezoelectric fixing groove is arranged between the top and the bottom of the base; one end of the piezoelectric sheet is inserted into the piezoelectric fixing groove, and the other end of the piezoelectric sheet is abutted against the bottom of the trigger mechanism; the trigger mechanism is assembled on the top of the base and can reciprocate along the vertical direction; the pressure sensor is arranged between the movable column and the trigger mechanism, and the top and the bottom of the pressure sensor are respectively abutted against the movable column and the trigger mechanism. Similar to the springboard when the piezoelectricity fixed slot of base is pegged graft to the piezoelectric patches, after trigger mechanism butt piezoelectric patches and reset, the piezoelectric patches can produce the vibration deformation, through deformation production electric quantity many times, improves the generating efficiency.

Description

Piezoelectric type vehicle weight detection device

Technical Field

The utility model relates to a road engineering technical field, more specifically relates to a piezoelectric type vehicle weight detection device.

Background

The existing road weighing equipment works depending on the traditional electric energy supply, and an external power supply is needed to be unfavorable for the arrangement of the weighing equipment; although the weighing equipment with a built-in power supply improves the convenience of equipment arrangement, the replacement process is more complicated after the energy of the power supply in the weighing equipment is exhausted, and the workload is larger; there is therefore a need for a weighing apparatus with built-in self-powered means. Piezoelectric power generation utilizes the positive piezoelectric effect of the piezoelectric sheet, when the piezoelectric sheet generates vibration deformation, the piezoelectric sheet can generate electric quantity to form an electrified state, the generated electric quantity can be conveyed to weighing equipment to work, and the problems encountered by a traditional power supply and a built-in portable power supply are solved.

The self-powered detection device comprises a control unit, a bearing substrate and a panel arranged at the top of the bearing substrate, wherein a displacement device, a piezoelectric module and a displacement detection device are arranged between the bearing substrate and the panel; the displacement devices are arranged at two ends of the bearing base body respectively and are arranged along the running direction of the vehicle, and the displacement devices are elastic components and used for resetting the panel after being pressed; the piezoelectric module comprises a shell arranged on the bearing base body and a piezoelectric conversion structure filled in the shell, wherein the top of the piezoelectric conversion structure is provided with a stress protection cushion block, and the piezoelectric conversion structure is used for converting the pressure of the panel into electric power for storage and output; the displacement detection device comprises a distance sensor, an elastic component and a trigger component; the distance sensor is connected with the elastic component, the compression direction of the elastic component is arranged along the direction of the lane line, and the trigger component is arranged at the bottom of the panel and used for triggering the elastic component to compress when the panel moves; the control unit is used for receiving the acceleration and the displacement of the panel and piezoelectric waveform signals output by the piezoelectric module, determining the total axle weight of the vehicle according to received parameters and outputting a judgment result of whether the vehicle jumps or not. However, the piezoelectric ceramic in the piezoelectric module of the device can deform only once every time force is transmitted, and the efficiency of generating electric quantity is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome above-mentioned prior art the defect, provide this embodiment and provide a piezoelectric type vehicle weight detection device, through the piezoelectricity fixed slot that is used for installing the piezoelectric patches in the base bottom setting, make it form the springboard, can produce the vibration deformation after the piezoelectric patches receives the conduction of primary force, produce many times and warp and then improved the efficiency that the electric quantity produced.

In order to solve the technical problem, the utility model discloses a technical scheme is:

a piezoelectric vehicle weight detection device comprises a moving column, a base, a piezoelectric patch, a resettable trigger mechanism and a pressure sensor, wherein the pressure sensor is used for weight detection and is electrically connected with the piezoelectric patch; the movable column is movably assembled in an installation hole in the top of the base, can extend into the base and can reciprocate in the vertical direction; the base is provided with a piezoelectric fixing groove for inserting the piezoelectric sheet; the piezoelectric fixing groove is arranged between the top and the bottom of the base; one end of the piezoelectric sheet is inserted into the piezoelectric fixing groove, and the other end of the piezoelectric sheet is abutted against the bottom of the trigger mechanism; the trigger mechanism is assembled at the top of the base and can reciprocate along the vertical direction; the pressure sensor is arranged between the movable column and the trigger mechanism, and the top and the bottom of the pressure sensor are respectively abutted to the movable column and the trigger mechanism.

The middle position of the top of the base is provided with a mounting hole for movably assembling the upper movable baffle, the trigger mechanism is positioned in the base, the top of the trigger mechanism can be abutted against the movable column, and pressure generated when a vehicle passes through the trigger mechanism is transmitted to the movable column through the movable column to move downwards so that the piezoelectric sheet is deformed and electrified; the trigger mechanism can reset automatically after being pressed down by the vehicle, and waits for the vehicle to pass next time. A pressure sensor is installed between the trigger mechanism and the movable column, pressure is transmitted to the pressure sensor after the movable column is pressed down by a vehicle, and the pressure sensor continues to press down the trigger mechanism to generate electric quantity which is transmitted to the pressure sensor to carry out weight detection. Similar to the springboard during piezoelectricity fixed slot of base is pegged graft to the piezoelectric patches, after trigger mechanism butt piezoelectric patches resets, the piezoelectric patches can produce the vibration deformation, through deformation production electric quantity many times, improves the generating efficiency.

As one preferable scheme, the piezoelectric sheet comprises an elastic substrate and piezoelectric ceramics; the piezoelectric ceramic is stacked on the top of the substrate; the base plate is provided with a plug connector which is matched with the piezoelectric fixing groove.

The piezoelectric ceramic is a functional ceramic material capable of mutually converting mechanical energy and electric energy, has dielectricity, elasticity and the like besides piezoelectricity, and is manufactured by utilizing the piezoelectric effect that the material causes the relative displacement of the centers of positive and negative charges in the material under the action of mechanical stress to generate polarization, so that bound charges with opposite signs appear on the surfaces of two ends of the material. The piezoelectric piece comprises a substrate and piezoelectric ceramics, the piezoelectric ceramics are stacked on the substrate, a part of space reserved on the substrate is not covered with the piezoelectric ceramics, the part of substrate is inserted into a piezoelectric fixing groove as a plug connector, the piezoelectric piece is of a structure similar to a diving board, when the piezoelectric piece is subjected to external force and is cancelled, the piezoelectric piece can vibrate up and down, the piezoelectric ceramics can deform for multiple times to generate power for multiple times, and the power generation efficiency of the piezoelectric piece is effectively improved.

As a preferred scheme, the triggering mechanism comprises a piezoelectric trigger and an elastic piece for resetting the piezoelectric trigger; the piezoelectric trigger is movably assembled in the base, and the elastic piece is located between the piezoelectric trigger and the base. Trigger mechanism

Install the elastic component between piezoelectric trigger and the base, can restore the normal position after piezoelectric trigger is pushed down, will move the post and push down when the vehicle passes through, piezoelectric trigger at this moment also follows and moves the compression elastic component that the post moves down, and after the vehicle left, the in-process of elastic component reconversion produced the elasticity opposite with pressure direction, made piezoelectric trigger reset, and then promoted to move the post and reset.

As a preferable scheme, the base is provided with a supporting seat for assembling the piezoelectric trigger; the piezoelectric trigger comprises a plurality of supporting columns, and the supporting seat is provided with a first through hole matched with the supporting columns; the support column is inserted and assembled in the first through hole; the piezoelectric trigger further comprises a supporting frame which is connected with the top of the strut and is abutted with the moving column; the elastic piece is arranged between the supporting frame of the piezoelectric trigger and the supporting seat of the base.

Piezoelectric trigger includes braced frame and pillar, pillar evenly distributed in braced frame's bottom and with the piezoelectric patches butt, braced frame's top with remove the post butt, remove the post and make the piezoelectric patches produce deformation through piezoelectric trigger when pushing down. The supporting seat is used for installing pillar and elastic component, be equipped with the first through-hole that corresponds with the pillar position on the supporting seat, pass first through-hole with the pillar, and install the elastic component between braced frame and supporting seat, because the supporting seat is fixed for the base, when piezoelectric trigger takes place decurrent relative motion, braced frame compresses tightly the elastic component downwards, the pillar pushes down and then produces the electric quantity with the piezoelectric patches of its butt, after the power of applying in piezoelectric trigger is withdrawn, the elastic component reconversion resets piezoelectric trigger.

The supporting seat is abutted against the base, the base is provided with an installation part for installing the supporting seat, and the shape of the installation part is adapted to that of the supporting seat; the cross section of the supporting seat is acute-angled triangle, the mounting part is an acute-angled notch, and the supporting seat is abutted to the notch and can be matched with the supporting column to limit the displacement of the supporting seat in all directions, so that the supporting seat is fixed in the base.

Preferably, the elastic member is a spring, and the spring is disposed coaxially with the pillar. The diameter of the spring is slightly larger than that of the support, the spring is sleeved in the support, and the support is inserted into the first through hole, so that the spring is positioned between the supporting frame and the supporting seat.

As a preferable scheme, the first through hole is provided with an installation groove for installing the spring, and the installation groove and the first through hole are coaxially arranged. The first through hole is provided with an installation groove for limiting the displacement of the spring, and the spring can be placed in the installation groove before penetrating into the strut; if insert the problem that the supporting seat can have the spring to drop easily with spring cover income pillar again, and the problem that the spring dropped in the installation can effectively be solved in the setting of mounting groove.

As a preferable scheme, the two ends of the base are provided with second through holes for fixing the base on the ground. The second through hole is the screw hole, uses and can be fixed in ground with screw hole matched with bolt with the base, avoids the base to take place the displacement and then influences the accuracy that weight detected.

As a preferable scheme, the bottom of the moving column is provided with a connecting hole and a connecting bolt which is matched with the connecting hole and used for limiting the moving column in the base. Through at removal column bottom precession connecting bolt, utilize connecting bolt's nut can be with removing the post card in the mounting hole, avoid removing the post and break away from the mounting hole.

Preferably, a protective cover for protecting the moving column is arranged on the top of the moving column. The visor is the taper shape, and inside cavity, the taper shape visor can avoid removing the post when the vehicle passes through and be buckled, can effectively protect the structure that removes the post.

As a preferable scheme, the protective cover comprises a first cover body and a second cover body which have the same structure; the movable column is provided with an end cap, and the first cover body and the second cover body are both provided with matching parts matched with the end cap; the matching part of the first cover body and the matching part of the second cover body are spliced to form an annular groove matched with the end cap; the first cover body and the second cover body are symmetrically distributed on two sides of a central axis of the movable column.

The protective cover is divided into two parts and comprises a first cover body and a second cover body which are the same, the two cover bodies are spliced to form a finished protective cover, matching parts are arranged on the sections of the first cover body and the second cover body and are semicircular and fit with the appearance and size of the movable column end cap, and the end cap can be clamped in the annular groove after the first cover body and the second cover body are spliced, so that the fixed connection of the movable column and the protective cover is realized.

Compared with the prior art, the utility model discloses a piezoelectric type vehicle weight detection device, the beneficial effect who gains is: similar to the springboard when the piezoelectricity fixed slot of base is pegged graft to the piezoelectric patches, after trigger mechanism butt piezoelectric patches and reset, the piezoelectric patches can produce the vibration deformation, through deformation production electric quantity many times, improves the generating efficiency. An elastic piece is arranged between the piezoelectric trigger and the base, and the elastic piece can restore the original position after the piezoelectric trigger is pressed down. Be provided with the supporting seat on the base and be connected with trigger mechanism, be favorable to the device installation and be connected, be equipped with the mounting groove that is used for installing the spring on the supporting seat moreover, can avoid the spring to drop, effectively improve the installation effectiveness. The protective cover is conical, so that the movable column can be prevented from being bent when a vehicle passes through, and the structure of the movable column can be effectively protected.

Drawings

Fig. 1 is a cross-sectional view of the overall structure of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a schematic view of the state of the first cover body engaged with the movable column.

Fig. 4 is a schematic view of the overall structure of the moving column.

Fig. 5 is a schematic view of the overall structure of the closure.

Fig. 6 is a schematic diagram of the overall structure of the flip-flop.

Fig. 7 is a schematic view of the overall structure of the support seat.

Fig. 8 is a schematic view of the base from a first perspective.

Fig. 9 is a schematic view of the base from a second perspective.

Fig. 10 is a schematic view of the overall structure of the piezoelectric sheet.

Wherein, 1, moving the column; 11. connecting holes; 12. an end cap; 13. a connecting bolt; 14. sealing the cover; 2. a base; 21. mounting holes; 22. a piezoelectric fixing groove; 23. a second through hole; 24. an installation part; 3. a piezoelectric sheet; 31. A substrate; 32. piezoelectric ceramics; 33. a plug-in connector; 4. a trigger mechanism; 41. a piezoelectric trigger; 42. an elastic member; 43. a pillar; 44. a support frame; 5. mounting grooves; 6. a supporting base; 61. a first through hole; 7. a fitting portion; 8. a protective cover; 81. a first cover body; 82. a second cover body.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms "upper", "lower", "left", "right", "long", "short", "top", "bottom", "inner", "outer", etc. indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, the description is merely for convenience of description and simplification of the description, but it is not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art will understand the specific meanings of the terms according to specific situations.

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

example 1

As shown in fig. 1-2, the present embodiment provides a piezoelectric vehicle weight detecting apparatus including a moving column 1, a base 2, a piezoelectric sheet 3, a resettable trigger mechanism 4, and a pressure sensor for weight detection and electrically connected to the piezoelectric sheet 3; the movable column 1 is movably assembled in a mounting hole 21 in the top of the base 2 and can reciprocate up and down along the central axis direction of the mounting hole 21, and when a vehicle passes through the movable column 1, the movable column can be pressed down to drive the trigger mechanism 4 to move downwards so that the piezoelectric sheet 3 deforms to generate electricity; when the vehicle drives away, the moving column 1 can reset along with the trigger mechanism 4, and at the moment, the piezoelectric sheet 3 is in a vibration state and continuously generates electric quantity; the base 2 is provided with a piezoelectric fixing groove 22 for inserting the piezoelectric sheet 3; the piezoelectric fixing groove 22 is arranged between the top and the bottom of the base 2; the trigger mechanism 4 is assembled on the top of the base 2, can reciprocate along the vertical direction and is contacted with the piezoelectric sheet 3; the pressure sensor is arranged between the movable column 1 and the trigger mechanism 4, and the top and the bottom of the pressure sensor are respectively abutted against the movable column 1 and the trigger mechanism 4.

As shown in fig. 2 and fig. 4 to 6, the trigger mechanism 4 includes a piezoelectric trigger 41 and an elastic member 42; the piezoelectric trigger 41 is movably assembled in the base 2, an elastic piece 42 for resetting the piezoelectric trigger 41 is installed between the piezoelectric trigger 41 and the base 2, and the elastic piece 42 is used for resetting after the trigger mechanism 4 is pressed down and pressing down again when waiting for the next vehicle to pass. The pressure sensor is arranged between the moving column 1 and the trigger mechanism 4, and is specifically positioned between the top of the piezoelectric trigger 41 and the bottom of the moving column 1; when a vehicle passes through, the movable column 1 is pressed downwards, the movable column 1 presses the trigger mechanism 4 downwards through the pressure sensor, the piezoelectric sheet 3 abutted to the bottom of the trigger mechanism 4 is deformed, electric quantity is generated, and the electric quantity is transmitted to the pressure sensor for weight detection.

Specifically, as shown in fig. 10, the piezoelectric sheet 3 includes an elastic substrate 31 and a piezoelectric ceramic 32; the piezoelectric ceramic 32 is stacked on top of the substrate 31; the substrate 31 is provided with a plug 33 for mating with the piezoelectric fixing groove 22. The piezoelectric ceramic 32 is a functional ceramic material capable of converting mechanical energy and electrical energy into each other, the piezoelectric ceramic 32 has piezoelectricity, dielectricity, elasticity and the like, and the piezoelectric ceramic 32 is manufactured by utilizing the piezoelectric effect that the piezoelectric ceramic material causes the relative displacement of the centers of positive and negative charges in the material to generate polarization under the action of mechanical stress, so that bound charges with opposite signs appear on the surfaces of two ends of the material. The piezoelectric patch 3 comprises a substrate 31 and piezoelectric ceramics 32, the piezoelectric ceramics 32 are stacked on the substrate 31, a part of space left on the substrate 31 is not covered by the piezoelectric ceramics 32, the part of substrate 31 is used as a plug 33 to be inserted into the piezoelectric fixing groove 22, the piezoelectric patch 3 forms a structure similar to a diving board, when the piezoelectric patch 3 is subjected to external force and removed, the piezoelectric patch 3 can vibrate up and down, the piezoelectric ceramics 32 can deform for multiple times to generate power for multiple times, and the power generation efficiency of the piezoelectric patch 3 is effectively improved.

Further, the base 2 is provided with a support seat 6 for assembling the piezoelectric actuator 41; the supporting seat 6 is abutted against the base 2, the base 2 is provided with an installation part 24 for installing the supporting seat 6, and the shape of the installation part 24 is adapted to the supporting seat 6; the cross section of the supporting seat 6 is acute-angled triangle, the mounting portion 24 is acute-angled notch, and the supporting seat 6 is abutted in the notch and can be matched with the supporting column 43 to limit the displacement of the supporting seat 6 in all directions, so that the supporting seat is fixed in the base 2. The piezoelectric trigger 41 is provided with six supporting columns 43, the six supporting columns 43 are distributed in two rows, and three supporting columns 43 are distributed in each row; the supporting seat 6 is provided with six first through holes 61 matched with the supporting columns 43; the support column 43 is inserted and assembled in the first through hole 61; the top of the support column 43 is provided with a support frame 44 which is abutted with the moving column 1; the elastic member 42 is disposed between the support frame 44 and the support base 6. The elastic member 42 is a spring, and the spring is coaxially disposed with the pillar 43. The diameter of the spring is slightly larger than that of the support column 43, the spring is sleeved in the support column 43, and the support column 43 is inserted into the first through hole 61, so that the spring is positioned between the support frame 44 and the support seat 6.

Further, both ends of the base 2 are provided with second through holes 23 for fixing the base 2 to the ground. Second through-hole 23 is the screw hole, uses and can be fixed in base 2 with screw hole matched with bolt ground, avoids base 2 to take place the displacement and then influence the accuracy that weight detected. The bottom of the movable column 1 is provided with a connecting hole 11; the moving post 1 is restricted in the mounting hole 21 by the connecting bolt 13. As shown in fig. 4-5, the connecting bolt 13 is screwed into the bottom of the moving column 1, the sealing cover 14 for increasing the connection tightness is arranged between the connecting bolt 13 and the moving column 1, and the sealing cover 14 is provided with a groove for matching with the connecting bolt 13, so that the moving column 1 can be clamped in the mounting hole 21 by the nut of the connecting bolt 13, and the moving column 1 is prevented from being separated from the mounting hole 21.

Example 2

In the piezoelectric vehicle weight detecting device according to embodiment 1, as shown in fig. 7, a first through hole 61 is provided with a mounting groove 5 for mounting a spring, and is disposed coaxially with the first through hole 61. As shown in the figure, the diameter of the mounting groove 5 formed at the top of the first through hole 61 is larger than that of the first through hole 61, and is adapted to the diameter of the spring, so that the spring is limited, and when the spring is placed in the mounting groove 5, the spring keeps an upright state; when the trigger mechanism 4 is assembled with the support seat 6, the support column 43 is inserted into the spring and then passes through the first through hole 61, so that the installation can be completed; if the spring is first inserted into the support column 43 and then inserted into the first through hole 61, the spring will fall off, which is not favorable for improving the installation efficiency.

Example 3

In the present embodiment, on the basis of embodiment 1 or embodiment 2, as shown in fig. 1 to 3, a protective cover 8 for protecting the moving column 1 is provided on the top of the moving column 1. The protective cover 8 is conical and hollow, the conical protective cover 8 can prevent the movable column 1 from being bent when a vehicle passes through, and the structure of the movable column 1 can be effectively protected. Because a part of the moving column 1 protrudes out of the ground and is contacted with the tire of the vehicle, a component force in the horizontal direction is generated on the moving column 1 in the rolling process of the tire, so that the moving column 1 is deformed; moreover, the contact area between the top of the moving column 1 and the tire is small, and the pressure of the contact position between the tire and the moving column 1 is large when a vehicle passes through, so that the tire is damaged, and the service life of the tire is shortened. The protective cover 8 is added, so that the moving column 1 can be effectively prevented from being bent and the tire can be prevented from being injured.

Specifically, the protective cover 8 includes a first cover 81 and a second cover 82 that are identical in structure; the movable column 1 is provided with an end cap 12, and the first cover body 81 and the second cover body 82 are both provided with a matching part 7 matched with the end cap 12; the first cover body 81 and the second cover body 82 can be combined to form an annular groove matched with the end cap 12; the first cover 81 and the second cover 82 may be adhered and symmetrically distributed on both sides of the central axis of the movable column 1. The first cover 81 and the second cover 82 are aligned with the end cap 12 of the movable column 1 and then joined together, and the first cover 81 and the second cover 82 are fixedly connected to each other by bonding with an adhesive such as glue.

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

Claims (10)

1. The utility model provides a piezoelectric type vehicle weight detection device which characterized in that: the device comprises a moving column (1), a base (2), a piezoelectric sheet (3), a resettable trigger mechanism (4) and a pressure sensor, wherein the pressure sensor is used for weight detection and is electrically connected with the piezoelectric sheet (3); the movable column (1) is movably assembled in an installation hole (21) in the top of the base (2), can extend into the base (2) and can reciprocate along the vertical direction;

the base (2) is provided with a piezoelectric fixing groove (22) for inserting the piezoelectric sheet (3); the piezoelectric fixing groove (22) is arranged between the top and the bottom of the base (2); one end of the piezoelectric sheet (3) is inserted into the piezoelectric fixing groove (22), and the other end of the piezoelectric sheet is abutted against the bottom of the trigger mechanism (4);

the trigger mechanism (4) is assembled at the top in the base (2) and can reciprocate along the vertical direction; the pressure sensor is arranged between the movable column (1) and the trigger mechanism (4), and the top and the bottom of the pressure sensor are respectively abutted against the movable column (1) and the trigger mechanism (4).

2. The piezoelectric vehicle weight detecting device according to claim 1, wherein: the piezoelectric sheet (3) comprises an elastic substrate (31) and piezoelectric ceramics (32); the piezoelectric ceramic (32) is stacked on top of the substrate (31); the substrate (31) is provided with a plug connector (33) matched with the piezoelectric fixing groove (22).

3. The piezoelectric vehicle weight detecting device according to claim 1, wherein: the trigger mechanism (4) comprises a piezoelectric trigger (41) and an elastic piece (42) for resetting the piezoelectric trigger (41); the piezoelectric trigger (41) is movably assembled in the base (2), and the elastic piece (42) is positioned between the piezoelectric trigger (41) and the base (2).

4. The piezoelectric vehicle weight detecting device according to claim 3, wherein: the base (2) is provided with a supporting seat (6) for assembling the piezoelectric trigger (41);

the piezoelectric trigger (41) comprises a plurality of struts (43), and the supporting seat (6) is provided with a first through hole (61) matched with the struts (43); the support column (43) is inserted into the first through hole (61);

the piezoelectric trigger (41) further comprises a support frame (44) connected to the top of the strut (43) and abutting against the mobile column (1); the elastic piece (42) is arranged between a supporting frame (44) of the piezoelectric trigger (41) and a supporting seat (6) of the base (2).

5. The piezoelectric vehicle weight detecting apparatus according to claim 4, wherein: the elastic piece (42) is a spring, and the spring and the support post (43) are coaxially arranged.

6. The piezoelectric vehicle weight detecting apparatus according to claim 5, wherein: the first through hole (61) is provided with a mounting groove (5) for mounting the spring, and the mounting groove (5) and the first through hole (61) are coaxially arranged.

7. The piezoelectric vehicle weight detecting apparatus according to claim 1, wherein: and second through holes (23) used for fixing the base (2) to the ground are formed in the two ends of the base (2).

8. The piezoelectric vehicle weight detecting apparatus according to claim 1, wherein: the bottom of the movable column (1) is provided with a connecting hole (11) and a connecting bolt (13) which is matched with the connecting hole (11) and used for limiting the movable column (1) in the base (2).

9. The piezoelectric vehicle weight detecting device according to claim 1, wherein: the top of the movable column (1) is provided with a protective cover (8) for protecting the movable column (1).

10. The piezoelectric vehicle weight detecting apparatus according to claim 9, wherein: the protective cover (8) comprises a first cover body (81) and a second cover body (82) which have the same structure;

the movable column (1) is provided with an end cap (12), and the first cover body (81) and the second cover body (82) are both provided with a matching part (7) matched with the end cap (12); the matching part (7) of the first cover body (81) and the matching part (7) of the second cover body (82) are spliced to form an annular groove matched with the end cap (12);

the first cover body (81) and the second cover body (82) are symmetrically distributed on two sides of a central axis of the movable column (1).

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