Automatic gas weighing system and weighing method

Abstract

The present invention discloses an automatic gas weighing system and weighing method, belonging to the field of automatic weighing technology. It comprises a loading station, a weighing station, a reference bottle placement station, an automatic conveying mechanism arranged opposite to the weighing station, and a tray carrier mechanism for placing the bottle body. The tray carrier mechanism is transported by the automatic conveying mechanism and switches between the loading station, the weighing station, and the reference bottle placement station. The beneficial effects of the present invention are: it can greatly improve the measurement accuracy, avoid the influence of many uncertain factors, and make the measurement result more accurate; it replaces manual operation to improve the measurement efficiency and avoid harming the health of the operator.

Description

Technical Field

[0001] The invention relates to an automatic gas weighing system, belonging to the technical field of automatic weighing. Background Art

[0002] There are many uncertainties in the high-precision measurement of gas mass, such as the accuracy of the electronic balance, including calibration and linearity; the repeatability of the balance reading, including the error caused by the position of the gas cylinder on the balance; the influence of air buoyancy; the influence of dust and adsorbed moisture on the outer surface of the gas cylinder; the mass loss error during the transfer of the gas cylinder, etc. In addition, if the weighing gas is toxic, it will endanger the health of the operator. Summary of the invention

[0003] In order to solve the defects of the prior art, the purpose of the present invention is to provide an automatic gas weighing system and weighing method which can replace manual work and improve the measurement accuracy.

[0004] The technical solution of the present invention is: an automatic gas weighing system, comprising a loading station, a weighing station, a reference bottle placement station, which are adjacent to each other in sequence, an automatic conveying mechanism arranged opposite to the weighing station, and a tray carrier mechanism for placing the bottle body, wherein the tray carrier mechanism is transported by the automatic conveying mechanism and the position is switched among the loading station, the weighing station, and the reference bottle placement station;

[0005] The automatic transport mechanism includes an XYZ three-directional moving device, and the XYZ three-directional moving device is connected to the transport fork;

[0006] The pallet carrying mechanism comprises a pallet body, fixed blocks fixed on both sides of the pallet body, a transport frame fixed on the pallet body, and a transport socket for cooperating with a transport fork opened on the side.

[0007] The transport rack comprises a lower fixing ring fixed on the pallet body, and the lower fixing ring is connected to the upper fixing ring through a connecting rod.

[0008] The XYZ three-directional moving device includes an X-guide rail fixed on a base, a Y-guide rail slidably connected to the X-guide rail via an X-axis servo driver, a Z-guide rail slidably connected to the Y-guide rail via a Y-axis servo driver, a slider slidably connected to the Z-guide rail via a Z-axis servo driver, and a connecting frame fixed to the end of the slider, which is connected to the transport fork.

[0009] The loading station is provided with a desktop a and a plurality of positioning blocks a located on the desktop a for positioning the tray body.

[0010] The weighing station is provided with a manual leveling device located on the bottom plate, an optical vibration reduction platform located on the manual leveling device, and a high-precision electronic balance located on the optical vibration reduction platform;

[0011] The reference bottle placement station is provided with a desktop b, on which are provided a plurality of positioning blocks b for positioning the tray body, and on which are also provided a detection sensor for detecting the presence or absence of a product on the tray body and a product arrival detection sensor.

[0012] The optical vibration reduction platform, the automatic transport mechanism, the presence detection sensor and the in-place detection sensor are all connected to the control system.

[0013] The control system includes a human-computer interaction interface, a switch, a PLC, and a serial port expansion module. The switch connects the human-computer interaction interface and the PLC. The PLC is connected to the optical vibration reduction platform, the product presence detection sensor, and the product arrival detection sensor through the serial port expansion module. The X-axis servo driver, the Y-axis servo driver, and the Z-axis servo driver are all connected to the PLC.

[0014] The model of the human-computer interaction interface is KTP700, the CPU model of the PLC is S7-1214C, the serial port expansion modules include CM1241, SM1221 and SM1223, the PLC is connected to the optical vibration reduction platform through the CM1241 serial port expansion module, the PLC is connected to the product presence detection sensor through the SM1221 serial port expansion module, and the PLC is connected to the product in-place detection sensor through the SM1223 serial port expansion module.

[0015] The loading station, weighing station, reference bottle placement station, automatic transport mechanism, and tray carrier mechanism are all located in the transparent cover.

[0016] The present invention also claims a method for weighing gas using an automatic gas weighing system, comprising the following steps:

[0017] Step a: manually put the target bottle into the loading station;

[0018] Step b: The automatic transport mechanism moves the reference bottle from the reference bottle placement station to the weighing station through the tray carrier mechanism, and the high-precision electronic balance measures the weight of the reference bottle and records the weighing data a;

[0019] Step c: The automatic transport mechanism moves the reference bottle from the weighing station to the reference bottle placement station through the pallet carrier mechanism, and the presence detection sensor and the in-place detection sensor detect the placed reference bottle. After confirmation, the automatic transport mechanism moves the target bottle from the loading station to the weighing station through the pallet carrier mechanism, and the high-precision electronic balance measures the weight of the target bottle and records the weighing data b;

[0020] Step d: The high-precision electronic balance sends the measurement data to the control system, which makes a difference between the weighing data a and the weighing data b and records the difference m1; the automatic handling mechanism then puts the target bottle back to the loading station;

[0021] Step e: Repeat step b to step d twice, record the difference m2 and m3; calculate and record the difference n1 between m1 and m2, the difference n2 between m1 and m3, and the difference n3 between m2 and m3. If the difference between any two of n1, n2, and n3 is less than 20 mg, it can be confirmed that the obtained m1, m2, and m3 are valid values, and then calculate and record the average value m of m1, m2, and m3;

[0022] Step f: manually taking out the qualified target bottle from the loading station and filling the target bottle with gas, and then putting it back to the loading station;

[0023] Step g: the automatic transport mechanism moves the reference bottle from the reference bottle placement station to the weighing station through the tray carrier mechanism, and the high-precision electronic balance measures the weight of the reference bottle and records the weighing data c;

[0024] Step h: The automatic transport mechanism moves the reference bottle from the weighing station to the reference bottle placement station through the pallet carrier mechanism, and the presence detection sensor and the in-place detection sensor detect the placed reference bottle. After confirmation, the automatic transport mechanism moves the inflated target bottle from the loading station to the weighing station through the pallet carrier mechanism, and the high-precision electronic balance measures the weight of the target bottle and records the weighing data d;

[0025] Step i: The high-precision electronic balance sends the measurement data to the control system, which makes a difference between the weighing data c and the weighing data d and records the difference p1; the automatic handling mechanism then puts the target bottle back to the loading station;

[0026] Step j: Repeat step g to step i twice, record the difference p2 and p3; calculate and record the difference q1 between p1 and p2, the difference q2 between p1 and p3, and the difference q3 between p2 and p3. If the difference between any two of q1, q2, and q3 is less than 20 mg, it can be confirmed that the obtained p1, p2, and p3 are valid values, and then calculate and record the average value p of p1, p2, and p3;

[0027] Step k: Calculate the value of pm, which is the weight of the gas in the target bottle.

[0028] The beneficial effects of the present invention are: it can greatly improve the measurement accuracy, can avoid and eliminate the influence of many uncertain factors, and the measurement result is more accurate; it can replace manual operation to improve the measurement efficiency and avoid harming the health of the operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A perspective view of the present invention;

[0030] Figure 2 The side view of the present invention Figure 1 ;

[0031] Figure 3 The side view of the present invention Figure 2 ;

[0032] Figure 4 A top view of the present invention;

[0033] Figure 5 It is the electrical schematic diagram of the present invention.

[0034] The reference numerals in the figure are as follows: 1.1, carrying fork, 1.2, base, 1.3, X-guide rail, 1.4, Y-guide rail, 1.5, Z-guide rail, 1.6, slider, 1.7, connecting frame, 2.1, tray body, 2.2, fixing block, 2.3, lower fixing ring, 2.4, connecting rod, 2.5, upper fixing ring, 3.1, table top a, 3.2, positioning block a, 4.1, bottom plate, 4.2, manual leveling device, 4.3, optical vibration reduction platform, 4.4, high-precision electronic balance, 5.1, table top b, 5.2, positioning block b. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 The present invention is further described:

[0036] An automatic gas weighing system comprises a feeding station, a weighing station, a reference bottle placement station, which are adjacent to each other in sequence, an automatic transport mechanism arranged opposite to the weighing station, and a tray carrier mechanism for placing bottles, wherein the tray carrier mechanism is transported by the automatic transport mechanism and switches between the feeding station, the weighing station, and the reference bottle placement station;

[0037] The automatic transport mechanism includes an XYZ three-directional moving device, which is connected to the transport fork 1.1; the pallet carrier mechanism includes a pallet body 2.1, fixed blocks 2.2 fixed on both sides of the pallet body 2.1, a transport frame fixed on the pallet body 2.1, and a transport socket for cooperating with the transport fork 1.1 on the side. When transport is required, the end of the transport fork 1.1 is inserted into the transport socket, and the XYZ three-directional moving device drives the transport fork 1.1 to move, and the transport fork 1.1 drives the pallet carrier and the bottle body located thereon to move, completing the switching of the bottle body (target bottle and reference bottle) between various stations.

[0038] The transport rack comprises a lower fixing ring 2.3 fixed on the tray body 2.1, and the lower fixing ring 2.3 is connected to an upper fixing ring 2.5 via a connecting rod 2.4. This structure of the transport rack can prevent the bottles from tipping over during transport.

[0039] The XYZ three-directional moving device includes an X-guide rail 1.3 fixed on a base 1.2, a Y-guide rail 1.4 slidably connected to the X-guide rail 1.3 via an X-axis servo driver, a Z-guide rail 1.5 slidably connected to the Y-guide rail 1.4 via a Y-axis servo driver, a slider 1.6 slidably connected to the Z-guide rail 1.5 via a Z-axis servo driver, a connecting frame 1.7 fixed to the end of the slider 1.6, and the connecting frame 1.7 is connected to the carrying fork 1.1.

[0040] The loading station is provided with a table top a3.1 and a plurality of positioning blocks a3.2 on the table top a3.1 for positioning the pallet body 2.1. The positioning blocks a3.2 can accurately position the pallet body 2.1 on the table top a3.1, and the transport fork 1.1 can be accurately inserted into the transport socket each time, ensuring smooth transport work.

[0041] The weighing station is provided with a manual leveling device 4.2 located on the bottom plate 4.1, an optical damping platform 4.3 located on the manual leveling device 4.2, and a high-precision electronic balance 4.4 located on the optical damping platform 4.3; the high-precision electronic balance 4.4 is adjusted to a horizontal level by the leveling device to avoid the influence of the unevenness of the high-precision electronic balance 4.4 on the measurement result. The damping effect of the optical damping platform 4.3 can avoid the influence of environmental vibration on the measurement result. Preferably, the high-precision electronic balance 4.4 can be a Mettler Toledo XPR series analytical balance.

[0042] The reference bottle placement station is provided with a desktop b5.1, and a plurality of positioning blocks b5.2 for positioning the tray body 2.1 are provided on the desktop b5.1. The desktop b5.1 is also provided with a product presence detection sensor and a product arrival detection sensor for detecting the tray body 2.1. The optical damping platform 4.3, the automatic handling mechanism, the presence detection sensor and the arrival detection sensor are all connected to the control system. The positioning block b5.2 can accurately position the tray body 2.1 to ensure the smooth progress of the handling work. The product presence detection sensor is used to detect whether there is a tray body 2.1 on the desktop b5.1, and the product arrival detection sensor is used to detect whether the tray body 2.1 is in place. After both tests are qualified, the control system sends the next action instruction.

[0043] The control system includes a human-computer interaction interface, a switch, a PLC, and a serial port expansion module. The switch connects the human-computer interaction interface and the PLC. The PLC is connected to the optical vibration reduction platform 4.3, a product presence detection sensor, and a product arrival detection sensor through the serial port expansion module. The X-axis servo driver, the Y-axis servo driver, and the Z-axis servo driver are all connected to the PLC.

[0044] The model of the human-computer interaction interface is KTP700, the CPU model of the PLC is S7-1214C, the serial port expansion modules include CM1241, SM1221 and SM1223, the PLC is connected to the optical vibration reduction platform 4.3 through the CM1241 serial port expansion module, the PLC is connected to the product presence detection sensor through the SM1221 serial port expansion module, and the PLC is connected to the product in place detection sensor through the SM1223 serial port expansion module.

[0045] The loading station, weighing station, reference bottle placement station, automatic handling mechanism, and tray carrier mechanism are all located in the transparent cover. The transparent cover can effectively avoid the disturbance and influence of the external environment on the measurement result during the measurement process.

[0046] The method for weighing gas using an automatic gas weighing system comprises the following steps:

[0047] Step a: manually put the target bottle into the loading station;

[0048] Step b: the automatic transport mechanism moves the reference bottle from the reference bottle placement station to the weighing station through the tray carrier mechanism, and the high-precision electronic balance 4.4 measures the weight of the reference bottle and records the weighing data a;

[0049] Step c: The automatic transport mechanism moves the reference bottle from the weighing station to the reference bottle placement station through the pallet carrier mechanism, and the presence detection sensor and the in-place detection sensor detect the placed reference bottle. After confirmation, the automatic transport mechanism moves the target bottle from the loading station to the weighing station through the pallet carrier mechanism, and the high-precision electronic balance 4.4 measures the weight of the target bottle and records the weighing data b;

[0050] Step d: The high-precision electronic balance 4.4 sends the measurement data to the control system, which makes a difference between the weighing data a and the weighing data b and records the difference m1; the automatic handling mechanism then puts the target bottle back to the loading station;

[0051] Step e: Repeat step b to step d twice, record the difference m2 and m3; calculate and record the difference n1 between m1 and m2, the difference n2 between m1 and m3, and the difference n3 between m2 and m3. If the difference between any two of n1, n2, and n3 is less than 20 mg, it can be confirmed that the obtained m1, m2, and m3 are valid values, and then calculate and record the average value m of m1, m2, and m3;

[0052] Step f: manually taking out the qualified target bottle from the loading station and filling the target bottle with gas, and then putting it back to the loading station;

[0053] Step g: the automatic transport mechanism moves the reference bottle from the reference bottle placement station to the weighing station through the tray carrier mechanism, and the high-precision electronic balance 4.4 measures the weight of the reference bottle and records the weighing data c;

[0054] Step h: the automatic transport mechanism moves the reference bottle from the weighing station to the reference bottle placement station through the pallet carrier mechanism, and the presence detection sensor and the in-place detection sensor detect the placed reference bottle. After confirmation, the automatic transport mechanism moves the inflated target bottle from the loading station to the weighing station through the pallet carrier mechanism, and the high-precision electronic balance 4.4 measures the weight of the target bottle and records the weighing data d;

[0055] Step i: The high-precision electronic balance 4.4 sends the measurement data to the control system, which makes a difference between the weighing data c and the weighing data d and records the difference p1; the automatic handling mechanism then puts the target bottle back to the loading station;

[0056] Step j: Repeat step g to step i twice, record the difference p2 and p3; calculate and record the difference q1 between p1 and p2, the difference q2 between p1 and p3, and the difference q3 between p2 and p3. If the difference between any two of q1, q2, and q3 is less than 20 mg, it can be confirmed that the obtained p1, p2, and p3 are valid values, and then calculate and record the average value p of p1, p2, and p3;

[0057] Step k: Calculate the value of pm, which is the weight of the gas in the target bottle.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic gas weighing system, characterized in that: It includes a loading station, a weighing station, a reference bottle placement station, which are adjacent to each other in sequence, an automatic transport mechanism arranged opposite to the weighing station, and a tray carrier mechanism for placing the bottle body, wherein the tray carrier mechanism is transported by the automatic transport mechanism and the position is switched among the loading station, the weighing station, and the reference bottle placement station; The automatic transport mechanism comprises an XYZ three-directional moving device, and the XYZ three-directional moving device is connected to the transport fork (1.1); The pallet transport mechanism comprises a pallet body (2.1), fixed blocks (2.2) fixed on both sides of the pallet body (2.1), a transport frame fixed on the pallet body (2.1), and a transport socket on the side for cooperating with a transport fork (1.1); The transport frame comprises a lower fixing ring (2.3) fixed on the pallet body (2.1), and the lower fixing ring (2.3) is connected to the upper fixing ring (2.5) via a connecting rod (2.4); The loading station is provided with a desktop a (3.1), and a plurality of positioning blocks a (3.2) located on the desktop a (3.1) for positioning the tray body (2.1).

2. The automatic gas weighing system according to claim 1, characterized in that: The XYZ three-directional moving device comprises an X-direction guide rail (1.3) fixed on a base (1.2), a Y-direction guide rail (1.4) slidably connected to the X-direction guide rail (1.3) via an X-axis servo driver, a Z-direction guide rail (1.5) slidably connected to the Y-direction guide rail (1.4) via a Y-axis servo driver, a slider (1.6) slidably connected to the Z-direction guide rail (1.5) via a Z-axis servo driver, a connecting frame (1.7) fixed to the end of the slider (1.6), and the connecting frame (1.7) connected to the transport fork (1.1).

3. The automatic gas weighing system according to claim 1, characterized in that: The weighing station is provided with a manual leveling device (4.2) located on the bottom plate (4.1), an optical vibration reduction platform (4.3) located on the manual leveling device (4.2), and a high-precision electronic balance (4.4) located on the optical vibration reduction platform (4.3); The reference bottle placement station is provided with a desktop b (5.1), on which are provided a plurality of positioning blocks b (5.2) for positioning the tray body (2.1), and on which are further provided a sensor for detecting the presence or absence of a product on the tray body (2.1) and a sensor for detecting the presence of a product in place.

4. The automatic gas weighing system according to claim 3, characterized in that: The optical vibration reduction platform (4.3), the automatic handling mechanism, the product presence detection sensor, and the product arrival detection sensor are all connected to the control system.

5. The automatic gas weighing system according to claim 4, characterized in that: The control system comprises a human-machine interaction interface, a switch, a PLC, and a serial port expansion module. The switch is connected to the human-machine interaction interface and the PLC. The PLC is connected to the optical vibration reduction platform (4.3), a product presence detection sensor, and a product arrival detection sensor through the serial port expansion module. The X-axis servo driver, the Y-axis servo driver, and the Z-axis servo driver are all connected to the PLC.

6. The automatic gas weighing system according to claim 5, characterized in that: The model of the human-machine interaction interface is KTP700, the model of the CPU of the PLC is S7-1214C, the serial port expansion modules include CM1241, SM1221 and SM1223, the PLC is connected to the optical vibration reduction platform (4.3) via the CM1241 serial port expansion module, the PLC is connected to the product presence detection sensor via the SM1221 serial port expansion module, and the PLC is connected to the product in-place detection sensor via the SM1223 serial port expansion module.

7. The automatic gas weighing system according to claim 1, characterized in that: The loading station, weighing station, reference bottle placement station, automatic transport mechanism, and tray carrier mechanism are all located in the transparent cover.

8. A method for weighing gas using the automatic gas weighing system according to claim 5, characterized in that: The steps include: Step a: manually put the target bottle into the loading station; Step b: The automatic transport mechanism moves the reference bottle from the reference bottle placement station to the weighing station through the tray carrier mechanism, and the high-precision electronic balance (4.4) measures the weight of the reference bottle and records the weighing data a; Step c: The automatic transport mechanism moves the reference bottle from the weighing station to the reference bottle placement station through the tray carrier mechanism. The product presence detection sensor and the product arrival detection sensor detect the placed reference bottle. After confirmation, the automatic transport mechanism moves the target bottle from the loading station to the weighing station through the tray carrier mechanism. The high-precision electronic balance (4.4) measures the weight of the target bottle and records the weighing data b. Step d: The high-precision electronic balance (4.4) sends the measurement data to the control system, which makes a difference between the weighing data a and the weighing data b and records the difference m1; the automatic handling mechanism then puts the target bottle back to the loading station; Step e: Repeat step b to step d twice, record the difference m2 and m3; calculate and record the difference n1 between m1 and m2, the difference n2 between m1 and m3, and the difference n3 between m2 and m3. If the difference between any two of n1, n2, and n3 is less than 20 mg, it can be confirmed that the obtained m1, m2, and m3 are valid values, and then calculate and record the average value m of m1, m2, and m3; Step f: manually taking out the qualified target bottle from the loading station and filling the target bottle with gas, and then putting it back to the loading station; Step g: The automatic transport mechanism moves the reference bottle from the reference bottle placement station to the weighing station through the tray carrier mechanism, and the high-precision electronic balance (4.4) measures the weight of the reference bottle and records the weighing data c; Step h: The automatic transport mechanism moves the reference bottle from the weighing station to the reference bottle placement station through the pallet carrier mechanism. The product presence detection sensor and the product arrival detection sensor detect the placed reference bottle. After confirmation, the automatic transport mechanism moves the inflated target bottle from the loading station to the weighing station through the pallet carrier mechanism. The high-precision electronic balance (4.4) measures the weight of the target bottle and records the weighing data d; Step i: The high-precision electronic balance (4.4) sends the measurement data to the control system, which makes a difference between the weighing data c and the weighing data d and records the difference p1; the automatic handling mechanism then puts the target bottle back to the loading station; Step j: Repeat step g to step i twice, record the difference p2 and p3; calculate and record the difference q1 between p1 and p2, the difference q2 between p1 and p3, and the difference q3 between p2 and p3. If the difference between any two of q1, q2, and q3 is less than 20 mg, it can be confirmed that the obtained p1, p2, and p3 are valid values, and then calculate and record the average value p of p1, p2, and p3; Step k: Calculate the value of pm, which is the weight of the gas in the target bottle.

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