CN106710418B

CN106710418B - Simulator for long-term exposure of plants to shallow water wave environment

Info

Publication number: CN106710418B
Application number: CN201710060621.2A
Authority: CN
Inventors: 邵冬冬; 周薇薇; 杨薇; 孙涛
Original assignee: Beijing Normal University
Current assignee: Beijing Normal University
Priority date: 2017-01-25
Filing date: 2017-01-25
Publication date: 2023-10-13
Anticipated expiration: 2037-01-25
Also published as: AU2017395343A1; AU2017395343B2; CN106710418A; WO2018137317A1

Abstract

The invention provides a simulation device for long-term exposure of plants to shallow water wave environments, which can realize the research of physiological and biochemical response mechanisms of plants on a long time scale under different wave parameter conditions. The invention provides a simulation device for long-term exposure of plants to shallow water wave environments, which comprises a water tank, a plant cultivation box, a crank, a connecting rod and a traction rod, wherein the plant cultivation box is arranged in the water tank, the crank, the connecting rod and the traction rod are sequentially hinged, the hinge shafts of the crank, the connecting rod and the traction rod are mutually parallel, the plant cultivation box is connected to the non-hinge end of the traction rod, the crank is connected with a power source, and the connecting rod and the traction rod drive the plant cultivation box to do linear reciprocating motion relative to still water in the water tank in the horizontal direction at a sine change speed so as to simulate the state of long-term exposure of the plants to the shallow water wave environments.

Description

Simulator for long-term exposure of plants to shallow water wave environment

Technical Field

The invention relates to the technical field of research on plant physiological and biochemical response mechanisms in a wave environment, in particular to a simulation device for long-term exposure of plants to a shallow water wave environment.

Background

The coastal ecological revetment is a direct and effective way for protecting the sea-land boundary zone, and plays an important role in protecting the coastline and maintaining the balance of the sea-land boundary ecological system. The adoption of plants for coast ecological revetment is a trend of development of current coast protection engineering, and compared with traditional hard revetment modes such as seawalls, flood control dykes and the like, the ecological revetment can provide habitats, maintain biodiversity and has stability and economic effects in the aspect of coping with sea level rising and storm surge invasion. Research on the plant playing a role in reducing waves in ecological bank protection is quite abundant, but at present, the research on the physiological and biochemical response mechanism of the plant under the action of waves is still blank.

Wave shallowing refers to the process of making the water depth shallow in the process of wave propagation from ocean to land, resulting in reduced wavelength, increased wave height and unchanged wave period, and the process of wave transition from deep water wave to shallow water wave. The salt marsh plants grow in shallow water wave areas after wave shallowing. Because the physiological and biochemical response mechanisms of the salt marsh plants exposed to different wave conditions for a long time are not elucidated, the key physiological and biochemical indexes of the salt marsh plants under the stress of long-term waves are monitored to judge the health condition of the plants, so that scientific basis is provided for species selection, transplanting time determination and the like of ecological revetment plants.

At present, the traditional wave water tank mainly adopts a push-plate type wave making method, and can not make waves for a long time and conduct long-period plant physiological and biochemical response mechanism research.

Therefore, there is a need to design a simulator for long-term exposure of plants to shallow water wave environments in order to simulate the real growth environment of plants for ecological shore protection, and further conduct long-period research on the physiological and biochemical response mechanisms of plants.

Disclosure of Invention

The invention aims to provide a simulator for long-term exposure of plants to shallow water wave environments, which can realize the research of physiological and biochemical response mechanisms of plants on a long time scale under different wave parameter conditions.

The invention provides a simulation device for long-term exposure of plants to shallow water wave environments, which comprises a water tank, a plant cultivation box, a crank, a connecting rod and a traction rod, wherein the plant cultivation box is arranged in the water tank, the crank, the connecting rod and the traction rod are sequentially hinged, the hinge shafts of the crank, the connecting rod and the traction rod are mutually parallel, the plant cultivation box is connected to the non-hinge end of the traction rod, the crank is connected with a power source, and the connecting rod and the traction rod drive the plant cultivation box to do linear reciprocating motion relative to still water in the water tank in the horizontal direction at a sine change speed so as to simulate the state of long-term exposure of the plants to the shallow water wave environments.

The simulation device adopts the principle of relative motion, realizes the driving of the plant cultivation box through the component formed by the crank, the connecting rod and the traction rod, further drives the plant cultivation box to do linear reciprocating motion in the horizontal direction relative to the still water in the water tank, at the moment, the speed of the plant cultivation box is in sinusoidal change, and can simulate the motion of water particles in shallow water waves, and further simulate the state that plants grow in the shallow water wave environment through the motion of the plant cultivation box relative to the still water. Compared with the traditional push plate wave making, the invention converts the motion of water particles relative to plants into the motion of plants relative to water particles, thereby breaking through the technical bottleneck that the traditional push plate wave making mode can not provide ideal wave environment for a long time, being capable of simulating for a long time, providing a basis for the research of physiological and biochemical response mechanisms of plants exposed to shallow water wave environment for a long time, and finally providing scientific basis for the selection of plant species of the ecological bank protection, the determination of transplanting time and the like. In addition, the invention can also adjust the period and wave height of the relative water movement of the plant by adjusting the rotation period, the rotation radius and other parameters of the crank so as to simulate the plant to grow in the wave environment with controllable wave parameters and study the influence of different wave parameters on the physiological and biochemical response mechanism of the plant.

Optionally, the extending direction of the crank is provided with more than two hinge positions, and the connecting rod is detachably hinged to one hinge position through a hinge piece.

Optionally, the hinge positions are hinge holes, more than two hinge holes are sequentially communicated in the extending direction of the crank to form a through groove, and the hinge piece can move in the through groove to change the hinge position hinged by the connecting rod.

Optionally, a scale is provided in the extending direction of the through groove for indicating the distance between each hinge position and the rotation center of the crank.

Optionally, the traction rod also comprises an appliance, wherein the appliance is provided with a correction hole matched with the traction rod, so that the traction rod can do linear reciprocating motion in the horizontal direction.

Optionally, the parts of the plant cultivation box at two ends in the moving direction are streamline, and the middle part is a square box body for bearing cultivation media.

Optionally, the plant cultivation device further comprises a combined frame connected to the non-hinged end of the traction rod, wherein the combined frame carries more than two plant cultivation boxes, and each plant cultivation box is distributed at intervals in a horizontal plane and perpendicular to the movement direction.

Optionally, each of the plant growing boxes is liftably mounted to the combining frame.

Optionally, the combined frame comprises a transverse frame and a vertical frame, the upper end of the vertical frame is connected with the transverse frame in a lifting manner, and the lower end of the vertical frame is provided with a mounting position matched with each plant cultivation box; the transverse frame is connected with the non-hinged end of the traction rod, guide rails extending in the same direction with the movement direction are arranged at the two ends of the top of the water tank, and the two ends of the transverse frame are in sliding or rolling fit with the guide rails at the same end.

Optionally, the combined frame further comprises a mounting frame arranged at the lower end of the vertical frame, the mounting frame extends in a horizontal plane perpendicular to the moving direction, more than two mounting positions are arranged in the extending direction of the mounting frame, and each plant cultivation box is hung at the corresponding mounting position.

Optionally, the combined rack further comprises hanging frames corresponding to the installation positions one by one and auxiliary frames extending in the same direction with the installation frames, the upper ends of the hanging frames are hung on the installation positions corresponding to the hanging frames, and the lower ends of the hanging frames are used for hanging the plant cultivation boxes; the auxiliary frame is connected between hanging points of adjacent plant cultivation boxes.

Optionally, the device further comprises a controller in signal connection with the power source, wherein the power source is a stepping motor, and the controller is used for controlling the rotation period of the stepping motor so as to control the plants to do linear reciprocating motion at a sine change speed according to the wave period of the shallow water wave.

Optionally, a pulley or a roller is mounted at the bottom of the water tank;

and/or the water tank is provided with a first bracket;

and/or the power source is provided with a second bracket for supporting the power source to a position corresponding to the crank.

Drawings

FIG. 1 is a schematic diagram of an analog device according to the present invention;

FIG. 2 is a front view of a simulation apparatus according to an embodiment of the present invention;

FIG. 3 is a top view of the simulation apparatus shown in FIG. 2;

FIG. 4 is a schematic perspective view of an embodiment of an apparatus for providing an analog device according to the present invention;

FIG. 5 is a schematic perspective view showing an arrangement of a plant cultivation box in a simulation apparatus according to the present invention;

FIG. 6 is a top view of the plant growing box of FIG. 5;

fig. 7 is a schematic perspective view of an arrangement mode of a combined frame in an analog device according to the present invention.

In fig. 1-7:

the plant cultivation box comprises a water tank 1, a guide rail 11, rollers 12, a first bracket 13, a plant cultivation box 2, a streamline 21, a square box body 22, a crank 3, a through groove 31, a connecting rod 4, a traction rod 5, a power source 6, a second bracket 61, a supporting platform 62, a corrector 7, a correction hole 71, a combined frame 8, a transverse frame 81, a vertical frame 82, a mounting frame 83, a hanging frame 84, an auxiliary frame 85, a regulating valve 86 and a controller 9.

Detailed Description

The invention provides a simulation device for long-term exposure of plants to shallow water wave environments, which can realize the research of physiological and biochemical response mechanisms of plants on a long time scale under different wave parameter conditions.

The present invention is specifically described below with reference to the accompanying drawings so that those skilled in the art can accurately understand the technical scheme of the present invention.

The direction described herein refers to the use state of the simulation device, and when in use, the direction perpendicular to the ground is the up-down direction, the vertical direction or the vertical direction, the direction pointing to the ground is the down direction, and the direction far away from the ground is the up direction; the plane vertical to the vertical direction is a horizontal plane, and in the horizontal plane, the movement direction is the direction parallel to the direction pointed by the movement of the plant cultivation box 2, for convenience of description, the direction pointed by the crank 3 is the front direction and the direction departing from the crank 3 is the back direction; in the horizontal plane, the lateral direction may be any direction intersecting the front-rear direction in the horizontal plane.

Since the salt-biogas plant grows in the shallow water wave region after the wave shallowing, only the shallow water wave environment is simulated herein, and the principle of the simulation device will be described in detail with reference to fig. 1.

In deep water waves, the motion track from the water surface to the water particles at the bottom of the water is circular, but the radius of the circular track gradually decreases until the radius of the circular motion track approaches zero when the water depth is L/2 (L is the wavelength). In shallow water waves, the motion track of the water particles is elliptical, the motion track of the water particles gradually flattens from the water surface to the bottom of the water, and the motion track of the water particles becomes a straight line (assuming that the motion of the water particles is non-rotating) at the bottom of the water.

The following relationship exists between the water depth h and the wavelength L in the shallow water wave:

h/L is less than or equal to 1/20 (1)

The velocity expression of the water particles in the horizontal direction in the shallow water wave is as follows:

wherein u is the speed of the water particle in the horizontal direction; h is wave height; g is gravity acceleration; k is wave number (k=2pi/L); t is the wave period; x is the position in the horizontal direction; t is time.

Theoretical and experimental observations show that the velocity of the water particles of the shallow water wave in the vertical direction is very small compared with the velocity of the water particles of the shallow water wave in the horizontal direction and can be ignored, so that the velocity of the water particles of the shallow water wave in the vertical direction is ignored, and the velocity of the water particles in the vertical direction is recorded as zero.

As shown in fig. 1, a crank OP in the crank-link mechanism is driven by a stepping motor to perform circular motion (a motion track of a point P is a circular dotted line in the figure) with a radius R and a point O as a center of a circle, so as to drive a link PQ (a length of l) to perform linear reciprocating motion in a horizontal direction of OQ by the crank OP and the stepping motor.

At this time, the speed of the object driven by the Q point and the lower part thereof in the horizontal direction can be expressed as follows:

wherein u' is the speed of the Q point and the object driven below the Q point in the horizontal direction; omega is the angular velocity; θ is the rotation angle at time t; t' is the rotation period of the crank-link mechanism driven by the stepping motor.

When the length l of PQ is much greater than the length R of OP, i.e.: when l > R, the speed of the object driven by the Q point and the lower part thereof in the horizontal direction can be approximately expressed as a sine function:

the flow velocity expression of water particles in the horizontal direction in shallow water waves is a cosine function (formula 2), the motion velocity expression of an object driven by a crank connecting rod in the horizontal direction is a sine function (formula 5), the two are in a mutual conversion relationship, the two are combined with each other, and for a given x position, if the waveforms of the two are consistent, the two can be deduced:

t' =t (6)

Namely: the rotation period T' of the crank-connecting rod mechanism is equal to the wave period T of the shallow water wave; for a fixed water depth H, the crank length R of the crank connecting rod has a interconversion relationship with the wave height H of the shallow water wave.

From the above analysis, the crank-link mechanism can be used to simulate the motion of water particles in shallow water waves.

As described in the background art, the manner of making waves by the push plate cannot make waves for a long time: on one hand, the wave water tank is generally 10-20 m long, so that the load of a wave mechanical system generated by pushing the water flow of the whole water tank is large, and the long-time running is difficult; on the other hand, the long-term wave generation in the closed water tank can lead to continuous reflection and superposition of waves, so that the waves are scattered, and ideal wave conditions required by experiments are difficult to meet.

According to the technical problem, by combining the principle, the invention designs the simulator for long-term exposure of the plants to the shallow water wave environment, and adopts the principle of relative motion, and the crank-link mechanism drives the plants to move, so that the plants simulate the movement of water particles in the shallow water wave, simulate the state of long-term exposure of the plants to the shallow water wave, and further provide a basis for researching physiological and biochemical response mechanisms of the plants.

As shown in fig. 2 and 3, the present invention provides a simulation apparatus for long-term exposure of plants to shallow water wave environments, comprising a water tank 1 and a plant cultivation box 2 placed in the water tank 1, wherein seawater can be injected into the water tank 1 as required to submerge the plant cultivation box 2 placed in the water tank 1, so that plants cultivated in the plant cultivation box 2 are in a partially submerged state. The invention also comprises a crank 3, a connecting rod 4 and a traction rod 5 which are hinged in sequence, wherein the crank 3 is connected with a power source 6 and driven by the power source 6 to rotate, one end of the connecting rod 4 is hinged with the crank 3, the other end of the connecting rod 4 is hinged with the traction rod 5, the end parts of the crank 3, the connecting rod 4 and the traction rod 5 are used as hinged ends and are hinged to form a connecting rod assembly, and the hinged shafts of all hinged parts are parallel to each other, so that the crank 3, the connecting rod 4 and the traction rod 5 are positioned in the same plane or in planes parallel to each other, and the driving reliability of the crank-connecting rod-traction rod is further ensured, so that the power can be stably transmitted to the traction rod 5 in the same direction. When the power source 6 drives the crank 3 to rotate, the crank 3 drives the connecting rod 4 to do circular motion around the rotating radius of the connecting rod 4 and the hinged end of the traction rod 5, and as the movement of the connecting rod 4 in the up-down direction is limited, when the connecting rod 4 does circular motion at one end, the other end of the connecting rod 4 does linear reciprocating motion in the horizontal direction and drives the traction rod 5 hinged with the connecting rod 4 to do linear reciprocating motion in the horizontal direction; further, as is clear from the above principle, the speed of the drawbar 5 in the horizontal direction varies sinusoidally. Meanwhile, the end of the traction rod 5 opposite to the hinged end of the connecting rod 4 forms a non-hinged end, the plant cultivation box 2 is connected to the non-hinged end of the traction rod 5, the plant cultivation box 2 is rigidly connected with the traction rod 5 in the horizontal direction, the traction rod 5 can drive the plant cultivation box 2 rigidly connected with the traction rod to do linear reciprocating motion in the horizontal direction at a speed of sine change, water in the water tank 1 is in a static state, the plant cultivation box 2 does linear reciprocating motion relative to the still water in the water tank 1, and the motion actually simulates the motion of water particles in shallow water waves, so that the state that plants are exposed to the shallow water wave environment for a long time is simulated.

According to the simulator, the connecting rod assembly consisting of the crank, the connecting rod and the traction rod is utilized to drive the plant cultivation box 2 to do linear reciprocating motion in the horizontal direction at a speed of sinusoidal variation, so that the motion of water particles in shallow water waves is simulated, and the state that plants are exposed to the shallow water waves is further simulated; compared with the wave is made to the push pedal among the prior art, the required energy of 2 drives of plant cultivation box is less, can last to carry out long-term simulation, and compare with the push pedal and make the wave, streamlined motion of plant cultivation box 2 reduces the rivers resistance to the minimum, can not produce great impact to the still water in the water tank 1, the hydroenergy in the water tank 1 keeps relatively static, can not influence the authenticity and the reliability of simulation because of the scattered scheduling problem of wave form that the reflection causes, can simulate the plant and expose in shallow water wave environment for a long time, satisfy the experimental demand. Therefore, the invention breaks through the technical bottleneck that the wave making mode of the push plate can not provide ideal wave environment for a long time, and provides a foundation for researching physiological and biochemical response mechanisms of plants exposed to shallow water wave environment for a long time.

Meanwhile, more than two hinge positions can be arranged in the extending direction of the crank 3, the connecting rod 4 can be selectively hinged at one hinge position, and particularly can be detachably hinged at the hinge position through a hinge piece, so that a proper rotation radius is selected to change the wave height of the simulated shallow water wave. The turning radius referred to herein means the distance in the extending direction of the crank 3 from the turning center of the crank 3 to the hinge point of the connecting rod 4 with the crank 3, and corresponds to the distance R of OP mentioned above, and has a interconversion relationship with the wave height H of the simulated shallow water wave.

In a specific embodiment, the above-mentioned hinge positions may be hinge holes, and more than two hinge holes are sequentially communicated in the extending direction of the crank 3 to form a through groove 31 extending in the same direction as the crank 3, and one hinge hole is formed by taking any point in the extending direction of the through groove 31 as a circle center and taking a dimension matched with the hinge piece as a radius, so that when the hinge piece moves along the through groove 31, different hinge holes can be selected, thereby changing the hinge position hinged by the connecting rod 4 and obtaining different rotation radii. At this time, by the arrangement of the through groove 31, the connecting rod 4 can basically select the hinge position in a stepless adjustment manner, thereby realizing stepless adjustment of the rotation radius, improving the adjustment precision and further realizing fine simulation of the wave height.

It is also possible to provide a scale in the extending direction of the through slot 31 for indicating the distance of each hinge position to the rotation center of the crank 3, i.e. for marking the size of R, so that a person skilled in the art selects an appropriate rotation radius as required, and improves the convenience in changing the rotation radius without measuring after each change of the rotation radius.

The through groove 31 has various structural types, can extend for a certain length from the rotation center of the crank 3, and can be distributed in the whole length direction of the crank 3 so as to improve the flexibility of adjusting the hinge position and expand the adjusting range; alternatively, the through groove 31 may extend a predetermined length from a position distant from the rotation center of the crank 3 to a direction away from the rotation center, and the supply link 4 may be hinged as long as an effective adjustment range can be formed. According to the different structural types of the through grooves 31, the scales can be arranged differently, for example, the scales can extend in the length direction of the whole crank 3, the scales can be marked only at the corresponding positions of the through grooves 31, and the specific marked form is not limited to the form that the rotation radius can be directly read, and the rotation radius can be obtained through indirect calculation.

As shown in fig. 4, the present invention may further include a corrector 7, wherein the corrector 7 is provided with a correction hole 71 matched with the traction rod 5, and the traction rod 5 penetrates through the correction hole 71 and maintains a linear reciprocating motion in a horizontal direction under the restriction of the correction hole 71, so as to ensure that the motion of the traction rod 5 is in the horizontal direction.

The correcting hole 71 can be matched with the traction rod 5 by adopting a shaft hole, so that the traction rod 5 can be allowed to move in the horizontal direction relative to the correcting hole 71, and the movement of the traction rod 5 in other directions except the horizontal direction can be limited.

The corrector 7 can be set to square block structure to form a round hole that link up in the horizontal direction in the centre of this square block structure, this round hole is correction hole 71 promptly, and the traction lever 5 can run through this correction hole 71 horizontally for correction hole 71 restricts the motion of traction lever 5, plays the spacing effect of correction, avoids traction lever 5 to produce the motion in other directions than the horizontal direction.

As shown in fig. 5 and 6, the plant growing cartridge 2 of the present invention may have streamline 21 at both ends in the moving direction and square box 22 for carrying the growing medium at the middle part.

The streamline 21 is a line tangent at any point on the curved surface and the direction of the flow vector of the airflow or water flow at that point are consistent, and is characterized by an egg-shaped shape and a smooth appearance. The streamline structure can furthest reduce the external resistance of the object in the motion. In particular, in the present invention, since the parts of the plant cultivation box 2 at both ends in the moving direction are streamline 21 and the part at the middle of the two streamline structures is square box body 22, the rear end of streamline 21 (corresponding to the middle part of plant cultivation box 2) is not in the form of tip arrangement but is connected by one square box body 22.

In the moving direction, the resistance of the water flow to the movement is reduced by the streamline structures at the two ends of the plant cultivation box 2; the square box 22 at the middle part is filled with a culture medium such as soil, and then plants are planted in the area of the square box 22, so that the planting density of the plants can be conveniently determined, and particularly, the square box 22 can be filled with the culture medium, and the upper end of the square box 22 is opened, so that the planted plants are exposed to the outside of the square box 22. Meanwhile, gauze and the like can be covered on the surface of the culture medium, so that scouring of water flow to the culture medium in the movement process can be reduced. The plant cultivation box 2 may be made of acrylic material, and the streamline shape 21 at both ends may be provided in a hollow structural form to reduce the weight of the plant cultivation box 2. When the middle of the plant cultivation box 2 is provided with the square box body 22, a person skilled in the art can plant the plants in a determinant arrangement mode with each side of the square box body 22 as a reference, so that the intervals between each plant are fixed or distributed according to a certain rule, and the planting density of the plants is easier to determine relative to the structure of the streamline 21 by the square box body 22.

On the basis of the above, the invention also comprises a combined frame 8 connected with the non-hinged end of the traction rod 5, wherein the combined frame 8 carries more than two plant cultivation boxes 2, and each plant cultivation box 2 is distributed at intervals in the horizontal plane and perpendicular to the movement direction. At this time, the relative positions of the plant cultivation boxes 2 in the moving direction are kept consistent, and parallel experiments can be performed to meet the statistical requirements of the experimental results. To better meet the requirements of parallel experiments, the combining rack 8 can bear three plant cultivation boxes 2, and the spacing between two adjacent plants in the three plant cultivation boxes 2 is kept equal.

As shown in fig. 7, the combined frame 8 and the plant cultivation boxes 2 can be installed in a lifting manner, so that each plant cultivation box 2 can be lifted to change the immersed height in the water tank 1; especially when the plant submerges in water for a long time, and the growth of the plant is influenced due to unsmooth respiration, the plant cultivation box 2 can be lifted to be above the water surface periodically or according to the needs by adopting a lifting structural type, a respiration environment is provided for the plant, and then the plant is lowered to a partially submerged state to continue the experiment. The structure is flexible to set, the submerging height of the plant can be adjusted according to the requirement, and the growth requirement of the plant is met while the experiment requirement is met, so that the experiment can be carried out for a long time.

In order to realize lifting of the plant cultivation boxes 2, the combined frame 8 of the invention can comprise a transverse frame 81 and a vertical frame 82, the vertical frame 82 extends up and down, the upper end of the vertical frame 82 is connected with the transverse frame 81 in a lifting manner, and the lower end of the vertical frame 82 is provided with a mounting position matched with each plant cultivation box 2, so that each plant cultivation box 2 can be mounted at the lower end of the vertical frame 82. When the plant cultivation box 2 needs to be lifted, only the installation positions of the vertical frame 82 and the transverse frame 81 need to be changed, the vertical frame 82 is moved upwards or downwards, the operation is simple and convenient, the plant cultivation box 2 does not need to directly extend into the position below the water surface to be directly operated, the realization is easier, and the experimental requirements can be better met.

Specifically, the vertical frame 82 and the horizontal frame 81 can be connected in a lifting manner by adopting connectors such as a regulating valve 86, specifically, connecting structures such as mutually matched connecting holes or clamping positions can be arranged, positioning is realized by the connectors such as the regulating valve 86, positioning is released when lifting regulation is needed, and the fixing is performed after a proper height is selected. Alternatively, the rack and pinion may be provided on the vertical frame 82 and the horizontal frame 81, respectively, and may be configured to be self-locking such that the rack extends in the vertical direction, and then the vertical position of the vertical frame 82 is changed by rotation of the driving gear, thereby lifting the plant cultivation box 2.

Meanwhile, as shown in fig. 2 and 3, a transverse frame 81 can be connected with the non-hinged end of the traction rod 5, guide rails 11 are arranged at two ends of the top of the water tank 1, the guide rails 11 extend in the same direction as the movement direction, and two ends of the transverse frame 81 are in sliding or rolling fit with the guide rails 11 at the same end. When the traction rod 5 moves in the horizontal direction, the transverse frame 81 can be driven to move in the horizontal direction along the guide rail 11, and as the relative positions of the transverse frame 81 and the vertical frame 82 in the horizontal direction are fixed, the vertical frame 82 and the plant cultivation box 2 connected with the lower end of the vertical frame 82 can be driven to move in the horizontal direction through the transverse frame 81.

At this time, the adoption of the guide rail 11 can support and guide the transverse frame 81, so that on one hand, the motion precision of the plant cultivation boxes 2 in the horizontal direction is improved, and on the other hand, the plant cultivation boxes 2 can be reliably supported, so that the plant cultivation boxes 2 are kept at the same height, and the requirements of parallel experiments are better met.

The cross frame 81 may extend in a horizontal plane perpendicular to the moving direction, that is, the cross frame 81 may be parallel to the distribution direction of each plant cultivation box 2, and at this time, the cross frame 81 and the vertical frame 82 have higher moving synchronicity in the front-rear direction, so that the reliability of power transmission can be improved. Meanwhile, the cross frame 81 is not limited to extending vertically in the moving direction, and a person skilled in the art can adjust the extending direction of the cross frame 81 as required, for example, so that the cross frame 81 deviates from the vertical direction of the moving direction by a small angle in the horizontal plane, as long as the driving of the plant cultivation box 2 is not affected.

The combined frame 8 of the present invention further includes a mounting frame 83 provided at the lower end of the vertical frame 82, the mounting frame 83 extending in a horizontal plane perpendicular to the moving direction, and two or more mounting positions are provided in the extending direction of the mounting frame 83, and each plant cultivation box 2 is hung at a corresponding mounting position. Alternatively, one skilled in the art may provide an integrated mounting location for each plant growing cartridge 2 as required to achieve a uniform assembly.

Adopt the structural style of mounting bracket 83, with the installation position integration in mounting bracket 83 of each plant cultivation box 2, then with each plant cultivation box 2 unified hang in the installation position, can realize the unified allotment to each plant cultivation box 2, can also improve the stability of each plant cultivation box 2, especially can keep each plant cultivation box 2's relative position, guarantee experimental conditions.

In addition, the combined rack 8 may further include a hanger 84 and an auxiliary rack 85, the hanger 84 corresponds to each installation position one by one, the auxiliary rack 85 extends in the same direction as the installation rack 83, the upper end of each hanger 84 is hung at the corresponding installation position, and the lower end is used for hanging the plant cultivation box 2, at this time, the hanger 84 may extend up and down, and more than two vertical rods may be specifically provided and connected to the two sides of the plant cultivation box 2 in a hanging manner. The auxiliary frame 85 is connected between the hanging points of the adjacent plant cultivation boxes 2 to play a role of auxiliary reinforcement, and specifically can be connected with the hanging points of each hanger 84 and the plant cultivation box 2, and can adopt connection modes such as threaded connection, welding and the like.

In addition, as shown in fig. 3, the present invention may further include a controller 9 in signal connection with the power source 6, specifically, a stepping motor may be used as the power source 6, and the rotation period of the stepping motor is controlled by the controller 9, and as described above, the rotation period of the stepping motor coincides with the wave period of the shallow water wave, so that by controlling the rotation period of the stepping motor, the plant can be controlled to reciprocate linearly at a sinusoidal variation speed according to the wave period of the shallow water wave.

The invention can also be provided with an auxiliary structure to improve the convenience of use. For example, pulleys or rollers 12 may be mounted to the bottom of the tank 1 to assist in effecting movement of the tank 1, with appropriate mounting locations being selected for the tank 1 as desired. The water tank 1 can also be provided with the first support 13 to support the water tank 1, improve the stability of water tank 1, the upper end of first support 13 can with the top fixed connection of water tank 1, the lower extreme of first support 13 can outwards slope relative to water tank 1, in order to improve the support reliability, and the lower extreme of first support 13 can also set up structures such as sucking disc, in order to be fixed in ground steadily. The power source 6 may be provided with a second bracket 61, and a supporting platform 62 may be provided at the top of the second bracket 61, and then the power source 6 and the crank 3 are mounted on the supporting platform 62, so that the power source 6 is located at a height position corresponding to the crank 3, and further reliability of driving the crank 3 is improved. Wherein the second bracket 61 can be arranged like the first bracket 13. The first and second members are used herein to distinguish between two brackets, and do not denote any particular limitation of the arrangement sequence.

The working process of the invention is as follows:

firstly, constructing a simulation device according to fig. 2, injecting seawater into a water tank 1 and setting the water depth, wherein the water depth refers to the height reached by the water surface of the injected seawater in the water tank 1, and is related to the water injection quantity and the specification of the water tank 1; then, filling the plant cultivation box 2 with the soil wrapped by the spun yarn cloth as a cultivation medium, and wrapping the soil by the spun yarn cloth to reduce erosion caused by water flow scouring; setting the depth of the plants in the plant cultivation box 2 submerged by the seawater in the water tank 1 by using the regulating valve 86 on the combined frame 8; because the wave period of the shallow water wave in which the simulated plant is positioned in the experiment is equal to the rotation period of the crank, the controller 9 is arranged, the stepping motor is driven to rotate according to the set rotation period, and then the plant is driven to do linear reciprocating motion according to the wave period of the shallow water wave at the speed of sinusoidal change, so that the simulated plant grows in the shallow water wave with different wave periods.

According to the conversion relation between the wave height and the rotation radius of the crank, the wave height parameter can be converted into the rotation radius of the crank, and the plant is simulated to grow in different wave height environments; the controller 9 and the switch of the stepping motor are started, the plants in the plant cultivation box 2 are driven to do linear reciprocating motion in the horizontal direction through the crank-link mechanism, the motion of water particles in shallow water waves is simulated, the principle of relative motion is applied, the plants are simulated to be exposed to the shallow water waves with controllable wave parameters (including wave periods and wave heights) for a long time, and then the response mechanism of plant physiology and biochemistry to wave stress is monitored.

After the above experiments of fixing the water depth, wave period and wave height are completed, the water depth of the water tank 1 is changed, the rotation period of the stepping motor is set by the controller 9, the rotation radius of the crank in the crank-connecting rod mechanism is adjusted, the above experimental steps are repeated, and the experiment under other wave parameter conditions is completed.

The simulation device for the long-term exposure of the plants to the shallow water wave environment is described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims

1. The simulation device for long-term exposure of the plants to the shallow water wave environment is characterized by comprising a water tank (1), a plant cultivation box (2) arranged in the water tank (1), and a crank (3), a connecting rod (4) and a traction rod (5), wherein the crank (3), the connecting rod (4) and the traction rod (5) are sequentially hinged, the hinge shafts of the crank (3), the connecting rod (4) and the traction rod (5) are mutually parallel, the crank (3) is connected with a power source (6), and the plant cultivation box (2) is driven to do linear reciprocating motion relative to still water in the water tank (1) in the horizontal direction at a sine change speed so as to simulate the state of long-term exposure of the plants to the shallow water wave environment;

the parts of the plant cultivation box (2) at the two ends of the moving direction are streamline (21).

2. Simulation device according to claim 1, characterized in that the extension direction of the crank (3) is provided with more than two hinge positions, the connecting rod (4) being detachably hinged to one of the hinge positions by means of a hinge.

3. A simulation device according to claim 2, characterized in that the hinge positions are hinge holes, two or more of which are in turn connected in the direction of extension of the crank (3) to form a through slot (31), the hinge member being movable in the through slot (31) for changing the hinge position at which the connecting rod (4) is hinged.

4. A simulation device according to claim 3, characterized in that the extension direction of the through slot (31) is provided with a scale for indicating the distance of each hinge position to the centre of rotation of the crank (3).

5. A simulation device according to claim 1, further comprising an orthosis (7) having a corrective aperture (71) cooperating with the drawbar (5) for making the drawbar (5) reciprocate linearly in a horizontal direction.

6. Simulation device according to claim 1, characterized in that the plant cultivation box (2) is centrally provided with a square box body (22) for carrying a cultivation medium.

7. A simulation device according to any of the claims 1-6, further comprising a combination rack (8) connected to the non-hinged end of the traction rod (5), the combination rack (8) carrying more than two plant growing boxes (2), each plant growing box (2) being spaced in a horizontal plane perpendicular to the direction of movement.

8. Simulation device according to claim 7, characterized in that each plant growing box (2) is mounted to the combined shelf (8) in a liftable manner.

9. The simulation device according to claim 8, wherein the combined frame (8) comprises a transverse frame (81) and a vertical frame (82), the upper end of the vertical frame (82) is connected with the transverse frame (81) in a lifting manner, and the lower end of the vertical frame is provided with a mounting position matched with each plant cultivation box (2); the transverse frame (81) is connected with the non-hinged end of the traction rod (5), guide rails (11) extending in the same direction as the movement direction are arranged at the two ends of the top of the water tank (1), and the two ends of the transverse frame (81) are in sliding or rolling fit with the guide rails (11) at the same end.

10. The simulation device according to claim 9, wherein the combined frame (8) further comprises a mounting frame (83) arranged at the lower end of the vertical frame (82), the mounting frame (83) extends in a horizontal plane perpendicular to the movement direction, and more than two mounting positions are arranged in the extending direction, and each plant cultivation box (2) is hung on the corresponding mounting position.

11. The simulation device according to claim 10, wherein the combined rack (8) further comprises hanging frames (84) corresponding to the installation positions one by one and auxiliary frames (85) extending in the same direction as the installation frames (83), the upper end of each hanging frame (84) is hung on the installation position corresponding to each hanging frame, and the lower end of each hanging frame is used for hanging the plant cultivation box (2); the auxiliary frame (85) is connected between hanging points of adjacent plant cultivation boxes (2).

12. A simulation device according to claim 7, further comprising a controller (9) in signal connection with the power source (6), wherein the power source (6) is a stepper motor, and the controller (9) is used for controlling the rotation period of the stepper motor so as to control the plants to do linear reciprocating motion at a sinusoidal variation speed according to the wave period of the shallow water wave.

13. Simulation device according to claim 7, characterized in that the bottom of the water tank (1) is fitted with pulleys or rollers (12);

and/or the water tank (1) is provided with a first bracket (13);

and/or the power source (6) is provided with a second bracket (61) to support the power source (6) to a position corresponding to the crank (3).