CN212300570U - Bale dynamic weighing device of square baler - Google Patents
Bale dynamic weighing device of square baler Download PDFInfo
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- CN212300570U CN212300570U CN202021819831.9U CN202021819831U CN212300570U CN 212300570 U CN212300570 U CN 212300570U CN 202021819831 U CN202021819831 U CN 202021819831U CN 212300570 U CN212300570 U CN 212300570U
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Abstract
An embodiment of the utility model provides a bale dynamic weighing device of square baler, include: the weighing platform is used for being installed at the outlet end of the bundling chamber; the bale state detection device is in communication connection with the weighing platform and is used for detecting the distribution state of the bales output by the baling chamber on the weighing platform; the utility model discloses based on the discernment to bale output state, can comparatively accurately and conveniently carry out online weighing to the bale of continuous output.
Description
Technical Field
The utility model relates to the technical field of agricultural machinery, especially, relate to a bale dynamic weighing device of square baler.
Background
In recent years, with the shortage of fossil energy and the gradual deterioration of agricultural environment, people pay more and more attention to sustainable development and environmental protection, and the development and utilization of biomass resources are gradually concerned by countries around the world. As a big agricultural country, China has the advantages of large crop straw yield, wide distribution and various varieties, realizes the comprehensive utilization of straws, and has very important significance for stabilizing the agricultural ecological balance, relieving the resource constraint and relieving the environmental pressure. However, in actual operation, the straws are randomly discarded and even incinerated, thereby bringing about a series of environmental problems. In order to solve the problem of straw burning from the source and effectively promote the comprehensive utilization work of straw recycling, the state carries out bundling operation subsidies on partial areas, wherein the quality of the bales is the most effective index for accounting the bundling operation subsidies.
The existing equipment for bundling the straws comprises a round baler and a square baler. When the square baler is used, the square baler is usually matched with a tractor and pulled by the tractor to advance. The square baler is characterized in that when advancing, various scattered straws in a farmland are collected by the matched spiral feeding device, the collected straws are fed into a baling chamber of the square baler in batches, in the process, the straws are compressed in a reciprocating mode by the compression mechanism matched with the baling chamber, when the straws are compressed into preset shapes and sizes, the compressed and formed straws are bundled and knotted through a bundling needle and a knotter, and then the straws are sequentially pushed to a straw falling plate arranged at the outlet of the baling chamber in a hinged mode and slide to the farmland from the straw falling plate. Compared with a round baler, the square baler is complex in structure, the output bales are regular rectangular cubes, the volume of the bales is moderate, the bales are convenient to transport and store, the size of the square baler is small, the square baler is suitable for transfer and transportation, and the square baler is particularly suitable for bundling operation in scattered and finely-crushed farmlands.
In the conventional patent document, a weight monitoring system for a bale of a square baler is disclosed, in which one end of a tension sensor is connected to one end of a bale placing plate, the other end of the tension sensor is connected to the upper side of an outlet end of a baling chamber, and the other end of the bale placing plate is hinged to the lower side of the outlet end of the baling chamber, so that tension fluctuation curves of the bale before and after falling can be obtained based on the tension sensor, and a mathematical model of the weight of the bale relative to a tension change value and a tension compensation value is established, thereby obtaining the weight of the bale. However, in the process of actually obtaining the weight of the bale, not only a complex moment balance equation needs to be established for the front and rear output bales, but also the tension fluctuation curve obtained by the tension sensor needs to be analyzed and processed, so that the requirement on the specialty is high, and the data processing process is relatively complex.
In the prior patent literature, a dynamic weighing device of the bundling machine is also disclosed, which is used for weighing round bales through a dynamic weighing platform. Because the compression molding of square baler to the bale all is the process of continuous action with the output, and the shape of each bale is the cuboid, thereby compare in the better isolation nature each other of circular bale, two adjacent square bales can produce the interact at the in-process of output, and arbitrary one square bale only has short time to stop on the platform of weighing, thereby current dynamic weighing device is not applicable to the dynamic weighing of square bale, be difficult to comparatively accurately weigh the weight of square bale.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a bale dynamic weighing device of square baler for solve and be difficult to the problem that the square bale of accurate and convenient output carries out online weighing at present.
An embodiment of the utility model provides a bale dynamic weighing device of square baler, include: the weighing platform is used for being installed at the outlet end of the bundling chamber; the bale state detection device is in communication connection with the weighing platform and is used for detecting the distribution state of the bales output by the baling chamber on the weighing platform.
According to the bale dynamic weighing device of the square baler, the table top of the weighing platform is used for being lower than the conveying surface at the bottom of the baling chamber; correspondingly, the bale state detection device comprises a limit switch, and a rotating arm of the limit switch is used for extending to one end, close to the baling chamber, of the weighing platform and is positioned between the table top of the weighing platform and the conveying surface at the bottom of the baling chamber.
According to the utility model discloses a bale dynamic weighing device of square baler of an embodiment, the weighing platform comprises a supporting seat, a pressure sensor and a tray; the supporting seat is used for being installed on the lower side of the outlet end of the bundling chamber, and the tray is installed on the upper side of the supporting seat through the pressure sensor.
According to the utility model discloses a bale dynamic weighing device of square baler, the platform of weighing still includes angle sensor, angle sensor is used for detecting the every single move angle of tray.
According to the utility model discloses a bale dynamic weighing device of square baler, the pressure sensor comprises a plurality of; and/or one end of the pressure sensor is arranged on the supporting seat, the other end of the pressure sensor faces the back face of the tray, a sunken hole is formed in the pressure sensor, the back face of the tray is connected with one end of the positioning pin, the other end of the positioning pin is inserted into the sunken hole, the inner diameter of the lower sunken hole is larger than the diameter of the positioning pin, and the depth of the lower sunken hole is smaller than the length of the positioning pin.
According to the utility model discloses a bale dynamic weighing device of square baler of an embodiment, one end of the supporting seat is used for connecting the lower side of the outlet end of the baling chamber through the suspension arm, so as to form a step for bale separation and conveying at the outlet end of the baling chamber; the middle part of the supporting seat is used for being connected with the upper side of the outlet end of the bundling chamber through a supporting chain component.
The embodiment of the utility model provides a pair of bale dynamic weighing device of side's machine, through setting up bale state detection device to the distribution state of the bale of real-time detection bundling chamber output on the platform of weighing, when a bale falls to the tray of platform of weighing completely, can acquire the quality of weighing of bale based on the platform of weighing, thereby based on the discernment to bale output state, can comparatively accurately and conveniently carry out online weighing to the bale of continuous output.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic perspective view of a first view angle of a bale dynamic weighing device of a square baler according to an embodiment of the present invention;
fig. 2 is an exploded schematic view of a second view angle of a bale dynamic weighing device of a square baler according to an embodiment of the present invention;
fig. 3 is a schematic structural view showing that the front end of the bale just falls on the weighing platform, and the rear end of the bale does not touch the rotating arm of the limit switch;
fig. 4 is a schematic structural view showing that the bale shown in the embodiment of the present invention falls onto the weighing platform, and the rear end of the bale touches the rotating arm of the limit switch;
FIG. 5 is a schematic view of the embodiment of the present invention showing the bale fully positioned on the weighing platform, with the rear end of the bale separated from the pivoted arm of the limit switch;
FIG. 6 is a schematic structural view of the bale of the embodiment of the present invention falling from the weighing platform to the ground;
fig. 7 is a block diagram of a control structure of a bale dynamic weighing device of the square baler provided by the embodiment of the invention;
fig. 8 is a flow chart of a weighing method of a bale dynamic weighing device based on a square baler according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of the embodiment of the present invention for stress analysis based on the status shown in fig. 5;
fig. 10 is a software flowchart for dynamically weighing output bales by the bale dynamic weighing device of the square baler provided by the embodiment of the invention.
In the figure, 1, a weighing platform; 11. a supporting seat; 12. a pressure sensor; 13. a tray; 14. an angle sensor; 2. a bundling chamber; 3. a limit switch; 4. positioning pins; 5. a suspension arm; 6. a support chain assembly; 7. and (5) baling the grass.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the present embodiment provides a bale dynamic weighing device of a square baler, comprising: the weighing platform 1 is used for being installed at the outlet end of the bundling chamber 2; the bale state detection device is in communication connection with the weighing platform 1 and is used for detecting the distribution state of the bales output by the baling chamber 2 on the weighing platform 1 so as to realize the dynamic identification of the output state of the bales.
Specifically, the bale dynamic weighing device of the square baler shown in the embodiment is used for detecting the distribution state of the bales output by the baling chamber 2 on the weighing platform 1 in real time by setting the bale state detection device, and when a single bale completely falls onto the tray 13 of the weighing platform 1, the weighing mass of the bale can be obtained based on the weighing platform 1, so that the bale can be accurately and conveniently weighed on line based on the recognition of the output state of the bale.
It should be noted that the bale condition detecting device shown in the present embodiment may be a camera, a correlation laser sensor, a limit switch shown in the following embodiment, etc. which are well known in the art, and is not particularly limited herein as long as the distribution condition of the bale on the weighing platform 1 can be accurately identified. The weighing platform 1 shown in this embodiment may be an electronic platform scale known in the art, or may be configured as shown in the following embodiment, in which the top surface of the weighing platform 1 is arranged at a position not higher than the conveying surface at the bottom of the baling chamber 2 so as not to affect the output of the bales.
As illustrated in fig. 1 and 2, in one of the preferred embodiments, the weighing platform 1 has a table surface lower than the conveying surface at the bottom of the baling chamber 2 to achieve dynamic separation of the bales output from the baling chamber 2; correspondingly, the bale state detection device comprises a limit switch 3, and a rotating arm of the limit switch 3 is used for extending to one end, close to the baling chamber 2, of the weighing platform 1 and is positioned between the table top of the weighing platform 1 and the conveying surface at the bottom of the baling chamber 2. Wherein, the weighing platform 1 comprises a supporting seat 11, a pressure sensor 12 and a tray 13; the supporting base 11 is used for being installed at the outlet end of the bundling chamber 2, and the tray 13 is installed at the upper side of the supporting base 11 through the pressure sensor 12.
From this, can judge the output state of bale based on limit switch 3, and the distribution state of bale on weighing platform 1 can be divided into four kinds as follows:
as shown in fig. 3, immediately after the bale 7 is output from the outlet end of the baling chamber 2, the bale 7 is distributed obliquely downward with respect to the horizontal plane, the front end of the bale 7 just falls on the weighing platform 1, and the rear end of the bale 7 is still at the outlet end of the baling chamber 2 and does not touch the rotating arm of the limit switch 3.
As shown in fig. 4, as the bale 7 is conveyed, the bale 7 falls onto the weighing platform 1, and the rear end of the bale 7 just touches the rotating arm of the limit switch 3.
As shown in fig. 5, during the continued transportation of the bales 7, the bales 7 are completely on the weighing platform 1, with the rear ends of the bales 7 being separated from the pivoted arms of the limit switches 3.
As shown in fig. 6, as the bale 7 continues to be transported, the bale 7 falls from the weighing platform 1 to the ground until it is separated from the weighing platform 1.
As shown in fig. 3 to 6 described above, since there is no bale on the tray 13 in the initial state, the mass of the tray 13 can be measured by the pressure sensor 12. As the baler starts to work, the current bale starts to enter the weighing platform 1 under the gradual pushing of the subsequent bale in the baling chamber 2, and the pressure detected by the pressure sensor 12 will gradually increase under the action of the superimposed pressure of the tray 13 and the bale. When the bale is in the distribution state as shown in fig. 4, the rotating arm of the limit switch 3 contacts the bale and outputs a low-level signal. Because the limit switch 3 has a certain counterforce on the bale, the pressure detected by the pressure sensor 12 on the weighing platform 1 does not reach the maximum value, and when the bale is in a distribution state as shown in fig. 5, the bale is completely positioned on the weighing platform 1, and the rotating arm of the limit switch 3 is separated from the bale, the limit switch 3 outputs a high-level signal, the pressure detected by the pressure sensor 12 reaches the maximum value, and the weighing quality of the bale can be accurately obtained through the detection data of the pressure sensor 12.
Preferably, during the operation of the bundling machine, under the influence of the ground undulation and the lifting of the pickup, the pitch angles of the supporting seat 11 and the tray 13 change in real time, so as to change the downward pressure generated by the tray 13 on the pressure sensor 12, and further, in this embodiment, an angle sensor 14 may be disposed on the weighing platform 1, and the pitch angle of the tray 13 is detected by the angle sensor 14, so as to dynamically correct the downward pressure generated by the tray 13.
As shown in fig. 2, the angle sensor 14 shown in this embodiment is mounted on the upper surface of the support base 11. The trays 13 may be of a trough-like structure distributed along the direction of transport of the bales 7. The supporting base 11 may be a plate-shaped member, and in order to ensure the stability of the installation of the supporting base 11, one end of the supporting base 11 close to the baling chamber 2 is connected with the lower side of the outlet end of the baling chamber 2 through two suspension arms 5 to form a step for separating and conveying the bales at the outlet end of the baling chamber 2; meanwhile, the middle part of the supporting seat 11 can be connected with the upper side of the outlet end of the bundling chamber 2 through two sets of supporting chain components 6.
As shown in fig. 2, the pressure sensor 12 shown in the present embodiment includes a plurality of, for example: the pressure sensors 12 may be specifically designed to be four, four pressure sensors are distributed at four corners of the supporting base 11, and the sum of the pressure data detected by the four pressure sensors is the downward pressure generated by the tray 13. Meanwhile, one end of the pressure sensor 12 can be specifically installed on the supporting seat 11, the other end faces the back face of the tray 13, a sunken hole is formed in the pressure sensor 12, the back face of the tray 13 is connected with one end of the positioning pin 4, the other end of the positioning pin 4 is inserted into the sunken hole, the inner diameter of the lower sunken hole is larger than the diameter of the positioning pin 4, the depth of the lower sunken hole is smaller than the length of the positioning pin 4, and therefore it can be ensured that only a pressure relation in the vertical direction exists between the tray 13 and the pressure sensor 12, and no tension relation exists between the positioning pin 4 and the sunken hole.
As shown in fig. 7, the present embodiment also illustrates a control structure block diagram of the bale dynamic weighing device of the square baler. Bale dynamic weighing device includes on control structure: the bundling machine comprises an information acquisition unit, a data acquisition processing unit and a data display and storage unit which are sequentially in communication connection, wherein the information acquisition unit comprises a GPS module and the pressure sensor, the angle sensor and the limit switch shown in the embodiment, and the GPS module is used for acquiring real-time position information of the bundling machine; the data acquisition and processing unit comprises an A/D conversion module, a processing module and an RS485 module which are sequentially in communication connection; the data display and storage unit includes a display terminal, which may be a touch screen display or an LCD display as is known in the art. Therefore, data information acquired by the information acquisition unit can be uniformly transmitted to the A/D conversion module to convert analog signals into digital signals, the weighing mass of the bale can be acquired through data processing of the processing module, related acquisition information and processing information can be synchronously uploaded to the display terminal through the RS485 module, and the display terminal can correspondingly match the data information detected by the pressure sensor and the angle sensor with the weighing mass acquired through calculation of the processing module and the position information acquired by the GPS module respectively and synchronously display and store the data information.
Preferably, as shown in fig. 8, the present embodiment further provides a weighing method of the bale dynamic weighing device of the square baler, which comprises: s1, acquiring the mass of the tray on the weighing platform; and S2, detecting the distribution state of the bales output by the baling chamber on the weighing platform, and acquiring the weighing mass of the bales based on the data information detected by the pressure sensor and the angle sensor on the weighing platform when a single bale completely falls onto the tray.
In particular, when dynamically weighing the bales output by the baler, reference is made to the operation flow shown in fig. 10.
Firstly, in an initial state, no bale exists on a tray of the weighing platform, and at the moment, the downward pressure generated by the tray on each pressure sensor is only the gravity component of the tray, so that the system firstly carries out initialization parameter setting, obtains the initial mass of the tray and writes a program, checks whether data communication is normal, and checks whether data are correct.
Then, the on-off state of the limit switch is detected, when the limit switch is detected to output an on-off signal (the bale is contacted with the rotating arm of the limit switch), the real-time data of the pressure sensor and the angle sensor are obtained, and when the bale is separated from the rotating arm of the limit switch, the weighing quality of the bale is synchronously calculated in real time.
As shown in fig. 9, by performing mechanical analysis on the state where the downward pressure of the tray reaches the maximum and is stabilized in this interval, it can be known that the downward pressure of the tray and the reaction force of the pressure sensor are always in a stress equilibrium state in this interval, and thus a mathematical model can be established as follows:
mgcosα+m’gcosα＝F；
in the formula: m is the weight of a single bale, m' is the weight of the tray, alpha is the pitch angle of the tray, F is the sum of the reaction forces of the pressure sensors, and g is the acceleration of gravity.
Since m' is a constant term, alpha and F can be synchronously acquired in real time to acquire the weighing mass of a single bale.
Then, when the bale passes through the weighing platform, the acquired pressure signal consists of the static load and the dynamic load of the bale, wherein the static load is the real mass of the measured bale, the dynamic load mainly comprises the superposed pressure caused by the vibration of the baler due to the ground bump and the mechanical transmission, and the noise signal caused by the vibration of the baler is in reciprocating oscillation. In order to obtain an accurate pressure signal, the dynamic load signal in the original signal needs to be effectively removed.
In S2, when the weighing mass of the bale is obtained based on the data information detected by the pressure sensor and the angle sensor on the weighing platform, multiple sets of sampling data may be obtained at a preset sampling frequency, and the multiple sets of sampling data are processed by a moving average filtering algorithm to obtain the weighing mass of the bale after being processed by the moving average filtering algorithm. In this embodiment, the sampling frequency can be set to 20Hz, that is, an average value is obtained every 20 data points. For the sampling signal of the angle sensor, because of the influence caused by the vibration of the bundling machine, the original signal of the angle sensor also has strong noise, in this embodiment, the original signal sampled by the angle sensor is also processed by adopting a moving average filtering algorithm, an average value is obtained every 20 data points, and the sampling frequency is also 20 Hz.
Therefore, the weighing mass of the bales can be calculated in real time based on the pressure and angle signals after data processing, wherein the sampling number can be set to be 10, and the weighing mass of the bales can be correspondingly obtained by calculating the arithmetic mean value of the weighing masses of the 10 bales.
Next, because the weighing system is also affected by the structural size and assembly of the baler during the baling operation, and the like, a certain system error may exist in the weighing system, in order to eliminate the influence of the system error, step S3 may be further provided in this embodiment, a calibration model is established based on the ratio of the weighing mass of the bale to the real mass thereof, and the weighing mass of the bale corrected by the calibration model is obtained by correcting the symmetrical weight of the calibration model.
Specifically, when the calibration model is established, the sampling data of n bales are acquired, so that the calibration model shown as follows can be acquired:
in the formula: k is a calibration coefficient, mpiFor the predicted value of the mass of each bale, mtiN is a natural number greater than 1 for the true value of the mass of each bale.
Therefore, the mass of the bales subjected to calibration correction is obtained to be m x k based on the calibration model, so that the system error in the measurement process can be effectively eliminated, and the accuracy of the obtained weighing mass of the bales is further ensured.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A bale dynamic weighing device of a square baler is characterized by comprising:
the weighing platform is used for being installed at the outlet end of the bundling chamber;
the bale state detection device is in communication connection with the weighing platform and is used for detecting the distribution state of the bales output by the baling chamber on the weighing platform.
2. A bale dynamic weighing apparatus of a square baler according to claim 1, characterised in that the weighing platform is adapted to have a table surface below the conveying surface at the bottom of the baling chamber;
correspondingly, the bale state detection device comprises a limit switch, and a rotating arm of the limit switch is used for extending to one end, close to the baling chamber, of the weighing platform and is positioned between the table top of the weighing platform and the conveying surface at the bottom of the baling chamber.
3. The bale dynamic weighing apparatus of a square baler of claim 2, wherein the weighing platform comprises a support base, a pressure sensor and a tray; the supporting seat is used for being installed on the lower side of the outlet end of the bundling chamber, and the tray is installed on the upper side of the supporting seat through the pressure sensor.
4. A bale dynamic weighing apparatus for a square baler according to claim 3, characterised in that the weighing platform further comprises an angle sensor for detecting the pitch angle of the tray.
5. A bale dynamic weighing apparatus of a square baler according to claim 3, characterised in that the pressure sensor comprises a plurality; and/or one end of the pressure sensor is arranged on the supporting seat, the other end of the pressure sensor faces the back face of the tray, a sunken hole is formed in the pressure sensor, the back face of the tray is connected with one end of the positioning pin, the other end of the positioning pin is inserted into the sunken hole, the inner diameter of the lower sunken hole is larger than the diameter of the positioning pin, and the depth of the lower sunken hole is smaller than the length of the positioning pin.
6. A bale dynamic weighing apparatus of a square baler according to claim 3, wherein one end of the support base is adapted to be connected to the underside of the outlet end of the baling chamber by a boom to form a step at the outlet end of the baling chamber for separate feeding of bales.
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| CN202021819831.9U CN212300570U (en) | 2020-08-25 | 2020-08-25 | Bale dynamic weighing device of square baler |
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| CN202021819831.9U CN212300570U (en) | 2020-08-25 | 2020-08-25 | Bale dynamic weighing device of square baler |
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