A powder metering device and method with an automatic checking function

Abstract

The present invention discloses a powder metering device and method with an automatic checking function. The device includes a weighing frame, a powder bin, a powder weighing hopper, and a powder double weighing and metering mechanism; the method includes: 1. Data storage; 2. Checking sensors; 3. Discharging; 4. Primary weighing of powder; 5. Secondary weighing of powder; 6. Refilling. In the present invention, the primary measurement is the set weighing value, and the secondary measurement is the actual weighing value. By measuring the powder released twice, the actual powder weight value is obtained, avoiding the situation where the weighed powder weight is inconsistent with the powder weight entering the mixing equipment; first, the first automatic weighing calibration mechanism is used to calibrate the first weighing sensor, and then the second automatic weighing calibration mechanism is used to calibrate the second weighing sensor. If the calibration is qualified, the subsequent weighing process is entered. If the calibration is unqualified, it is corrected through the controller, and after the correction is completed, the subsequent weighing process is entered; avoiding weighing errors.

Description

Technical Field

[0001] The present invention belongs to the technical field of weighing and metering, and particularly relates to a powder metering device and method with an automatic calibration function. Background Art

[0002] In traditional concrete, dry mix, and asphalt continuous mixing equipment, there are generally two ways to weigh powders: continuous powder weighing and intermittent powder weighing; most powder weighings use the method of continuous powder weighing. This weighing method usually detects through sensors and controls with a controller to achieve continuous feeding and continuous discharging. However, in actual applications, using this powder metering method often has large weight fluctuations, resulting in greater errors and deviating from the designed curve. Through analysis, it can be seen that the biggest reason for the error is that the weight of the powder carried away by the rotating blades of the weighing powder rotary valve is ignored in the actual weight of the powder entering the mixing equipment, resulting in a situation where the weighing weight of the rotary valve is inconsistent with the weight of the powder entering the mixing equipment, and finally leading to a poor qualified rate of the finished mixture. In addition, to ensure the accuracy of weighing, the sensor needs to be calibrated before each weighing. The traditional calibration uses weights, but the weights need to be carried before and after calibration. Frequent weight carrying and time consumption not only consume manpower but also prolong the construction period. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a powder metering device with an automatic calibration function for the above-mentioned deficiencies in the prior art. By setting a double powder weighing and metering mechanism, the first measurement is the set weighing value, and the second measurement is the actual weighing value. Through the secondary measurement of the discharged powder, the actual powder weight value is obtained, avoiding the situation where the weighing weight of the powder is inconsistent with the weight of the powder entering the mixing equipment, and ensuring the qualified rate of the finished mixture; first, use the first automatic weighing and calibration mechanism to calibrate the first weighing sensor, and then use the second automatic weighing and calibration mechanism to calibrate the second weighing sensor. If the calibration is qualified, enter the subsequent weighing link. If the calibration is unqualified, correct it through the controller, and then enter the subsequent weighing link after the correction is completed; avoid weighing errors.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: A powder metering device with an automatic calibration function, characterized in that it includes a weighing rack vertically arranged on the ground, a powder bin vertically arranged above the weighing rack, a powder weighing hopper vertically arranged below the powder bin, and a double powder weighing and metering mechanism arranged at the bottom of the weighing rack and disposed at the discharge port of the powder weighing hopper;

[0005] A powder channel is vertically arranged at the discharge port of the powder silo. The powder channel is vertically arranged between the discharge port of the powder silo and the inlet of the powder weighing hopper. A butterfly valve is horizontally arranged in the powder channel. The butterfly valve is controlled by a controller.

[0006] A powder loosening mechanism is horizontally arranged in the powder weighing hopper. A plurality of air flow promoters are arranged on the inner side wall of the powder weighing hopper, and the plurality of air flow promoters are uniformly arranged along the circumferential direction of the powder weighing hopper.

[0007] The powder double weighing and metering mechanism includes a powder weighing rotary valve arranged at the discharge port of the powder weighing hopper and a powder screw weigher horizontally arranged below the powder weighing rotary valve and connected to the powder weighing rotary valve. The powder screw weigher is installed on the weighing rack through a mounting bracket. The powder weighing rotary valve and the powder screw weigher are connected through a breathable hose. A first encoder is arranged on the powder weighing rotary valve, and a second encoder is arranged on the powder screw weigher. Both the first encoder and the second encoder are connected to the controller.

[0008] Two groups of weighing components are symmetrically arranged at the top of the powder weighing hopper. A first automatic weighing calibration mechanism is connected to each group of weighing components. The weighing component includes two first weighing sensors, and the two first weighing sensors are respectively arranged at the top of the powder weighing hopper and located on the same side of the powder weighing hopper. One end of the first weighing sensor is connected to the top of the powder weighing hopper through a lifting lug, and the other end of the first weighing sensor is connected to one side of the first automatic weighing calibration mechanism through a suspension rod. The other side of the first automatic weighing calibration mechanism is connected to the top of the powder weighing hopper through two first support rods.

[0009] A second weighing sensor is arranged at the end of the powder screw weigher away from the powder weighing hopper, and a second automatic weighing calibration mechanism is connected to the second weighing sensor. One end of the second weighing sensor is installed on a support column through a horizontally arranged mounting rod, and the other end of the second weighing sensor is installed on the outer side surface of the powder screw weigher. One side of the second automatic weighing calibration mechanism is connected to the weighing rack through a second support rod, and the other side of the second automatic weighing calibration mechanism is installed on the mounting bracket. Both the first weighing sensor and the second weighing sensor are connected to the controller, and a memory is connected to the controller.

[0010] The structures of the first automatic weighing calibration mechanism and the second automatic weighing calibration mechanism are the same. The first automatic weighing calibration mechanism and the second automatic weighing calibration mechanism both include a leather bag cylinder, a connection component connected to one side of the leather bag cylinder, a claw component connected to the connection component, and weights arranged on the claw component. The connection component includes a leather bag valve fixing plate vertically arranged on one side of the leather bag cylinder, two claw fixing plates both vertically arranged on the upper side of the leather bag valve fixing plate and symmetrically arranged, and a connecting shaft horizontally connected between the two claw fixing plates. The claw component includes two first claws both vertically connected to the connecting shaft and a second claw vertically arranged between the two first claws and arranged on the connecting shaft. The weights are horizontally arranged on the two first claws and the second claw. The connecting shaft is fixedly connected to the two first claws, the connecting shaft is fixedly connected to the upper part of the second claw, and the piston rod of the leather bag cylinder horizontally passes through the leather bag valve fixing plate and is hingedly connected to the lower part of the second claw.

[0011] The above-mentioned powder metering device with an automatic calibration function is characterized in that: the weighing frame includes four support columns all vertically arranged and a plurality of transverse connecting frames all horizontally arranged between the four support columns. The bottom of the support column is horizontally provided with a bottom plate, and a connecting rib plate is obliquely arranged between the support column and the bottom plate. The four support columns, the plurality of connecting frames, the bottom plate, and the connecting rib plate are integrally formed.

[0012] The above-mentioned powder metering device with an automatic calibration function is characterized in that: the powder loosening mechanism includes a rotating shaft horizontally penetrating through the powder weighing hopper, a plurality of loosening blades all arranged on the rotating shaft, and a pneumatic motor arranged at the end of the rotating shaft and arranged outside the powder weighing hopper. The two ends of the rotating shaft are installed on the powder weighing hopper through a support seat, and a bearing seat one for installing the rotating shaft is arranged on the support seat.

[0013] The above-mentioned powder metering device with an automatic calibration function is characterized in that: one end of the installation bracket is installed on the transverse connecting frame at the bottom of the weighing frame through a connecting piece, and the other end of the installation bracket is connected to the second automatic weighing calibration mechanism. The installation bracket includes two installation cross bars both horizontally arranged on the lowermost transverse connecting frame and two installation vertical bars both vertically arranged at the ends of the installation cross bars. Two connecting cross bars are connected between the two installation cross bars. The two installation cross bars, the two installation vertical bars, and the two connecting cross bars are integrally formed. A connecting ear is vertically arranged at the end of the installation cross bar far from the installation vertical bar.

[0014] The above-mentioned powder metering device with an automatic checking function is characterized in that: the connecting piece includes an auxiliary connecting rod horizontally arranged between the transverse connecting frames at the bottom of the weighing frame, two auxiliary support rods vertically arranged on the auxiliary connecting rod, and a connecting rod horizontally connecting the auxiliary support rod and the connecting ear, and the connecting rod is installed between the auxiliary support rod and the connecting ear through bolts.

[0015] The above-mentioned powder metering device with an automatic checking function is characterized in that: weight supports are arranged at both ends of the weight, and the weight and the weight supports are connected by U-shaped fixing bolts; the weight supports in the first automatic weighing checking mechanism are connected to the first weighing sensor through a suspension rod; the weight supports in the second automatic weighing checking mechanism are connected to the transverse connecting frame at the bottom of the weighing frame through a second support rod.

[0016] The above-mentioned powder metering device with an automatic checking function is characterized in that: the bladder cylinder and the bladder valve fixing plate are connected by a plurality of fixing pieces, and a bearing seat two is connected to the end of the connecting shaft; the bladder valve fixing plate in the first automatic weighing checking mechanism is installed between two first support rods, and the bladder valve fixing plate in the second automatic weighing checking mechanism is installed between two installation vertical rods.

[0017] The above-mentioned powder metering device with an automatic checking function is characterized in that: the weight support includes a horizontally arranged weight support bottom plate and three weight fixing plates vertically arranged on the top surface of the weight support bottom plate, and the weight support bottom plate and the three weight fixing plates are integrally formed; the weight fixing plates are right-angled trapezoidal structural plates, the three weight fixing plates are arranged perpendicular to each other, the right-angled waists of the three weight fixing plates are uniformly arranged at positions away from the center of the weight support bottom plate, and the three weight fixing plates enclose a bearing seat for installing the weight.

[0018] The present invention also provides a method for powder metering of a powder metering device with an automatic checking function, which is characterized in that: it includes the following steps:

[0019] Step 1, data storage: store the designed rotation speed of the powder weighing rotary valve, the weight of the weight, the weight of the powder screw weigher, and the upper limit value and lower limit value of the powder weight carried in the powder weighing hopper in a memory.

[0020] Step 2, check the sensor, the process is as follows:

[0021] Step 201, calibrate the first weighing sensor: The controller controls the piston rod of the bladder cylinder to extend. The second pawl rises driven by the piston rod, and the connecting shaft connected to the second pawl also rises accordingly. The first pawl connected to the connecting shaft also rises, so that both the first pawl and the second pawl contact the weight and lift the weight. The weight of the weight is directly applied to the first weighing sensor, and the first weighing sensor measures the weight of the weight. When the measured value of the first weighing sensor is equal to the weight value stored in the memory, perform Step 202; otherwise, the controller corrects the first weighing sensor, and after the calibration is completed, perform Step 202;

[0022] Step 202, calibrate the second weighing sensor: The controller controls the piston rod of the bladder cylinder to extend. The second pawl rises driven by the piston rod, and the connecting shaft connected to the second pawl also rises accordingly. The first pawl connected to the connecting shaft also rises, so that both the first pawl and the second pawl contact the weight and lift the weight. The weight of the weight is directly applied to the second weighing sensor, and the second weighing sensor measures the weight of the powder screw weigher. When the measured value of the second weighing sensor is equal to the weight value stored in the memory, perform Step Three; otherwise, the controller corrects the second weighing sensor, and after the calibration is completed, perform Step Three;

[0023] Step Three, feeding: The controller controls the butterfly valve to open, and the powder is discharged from the powder silo into the powder weighing hopper; the first weighing sensor weighs the powder entering the powder weighing hopper. When the weight of the powder in the powder weighing hopper reaches the upper limit of the weight value stored in the memory, the controller controls the butterfly valve to close;

[0024] Step Four, primary weighing of the powder: Start the powder weighing rotary valve, and the powder enters the powder weighing rotary valve from the powder weighing hopper. The first encoder measures the rotation speed of the powder weighing rotary valve to obtain the set weight value of the powder;

[0025] Step Five, secondary weighing of the powder: Start the powder screw weigher, and the powder continues to be discharged into the powder screw weigher. The second weighing sensor weighs the powder entering the powder screw weigher to obtain the actual weight value of the powder;

[0026] Step Six, replenishing: The first weighing sensor measures the weight of the powder in the powder weighing hopper. When the weight of the powder in the powder weighing hopper reaches the lower limit of the weight value stored in the memory, the controller controls the butterfly valve to open; repeat Step Three to Step Five until all the powder is discharged.

[0027] A method for measuring powder using the above powder metering device with an automatic calibration function, characterized in that: in step four, during the process of the powder entering the powder weighing rotary valve, the powder loosening mechanism and multiple air assistors are started to loosen and disperse the powder entering the powder weighing rotary valve, so that the powder is evenly discharged.

[0028] The present invention has the following advantages compared with the prior art:

[0029] 1. By setting a double powder weighing and metering mechanism in the present invention, the first measurement is the set weighing value, and the second measurement is the actual weighing value. Through the secondary measurement of the discharged powder, the actual powder weight value is obtained, avoiding the situation where the weighed powder weight is inconsistent with the powder weight entering the mixing equipment, and ensuring the qualification rate of the finished mixed material.

[0030] 2. The present invention sets a first automatic weighing calibration mechanism on the first weighing sensor and connects a second automatic weighing calibration mechanism to the second weighing sensor. By calibrating the sensors before starting the machine, the work of carrying weights in traditional calibration is avoided, no heavy physical labor is required, the safety risk during weight handling is reduced, and a large amount of time cost is saved.

[0031] 3. The present invention is provided with a powder loosening mechanism in the powder weighing hopper, which can loosen the powder by rotating the loosening blades to prevent caking; in addition, air assistors are arranged in the powder weighing hopper to evenly send a large amount of dry and high-pressure air into the powder weighing hopper to make the powder fluffy and eliminate arching.

[0032] 4. The method steps of the present invention are simple. First, the first automatic weighing calibration mechanism is used to calibrate the first weighing sensor, and then the second automatic weighing calibration mechanism is used to calibrate the second weighing sensor. If the calibration is qualified, the subsequent weighing link is entered; if the calibration is unqualified, it is corrected through the controller, and then the subsequent weighing link is entered after the correction is completed; weighing errors are avoided.

[0033] In summary, the present invention sets a double powder weighing and metering mechanism, the first measurement is the set weighing value, and the second measurement is the actual weighing value. Through the secondary measurement of the discharged powder, the actual powder weight value is obtained, avoiding the situation where the weighed powder weight is inconsistent with the powder weight entering the mixing equipment, and ensuring the qualification rate of the finished mixed material; first, the first automatic weighing calibration mechanism is used to calibrate the first weighing sensor, and then the second automatic weighing calibration mechanism is used to calibrate the second weighing sensor. If the calibration is qualified, the subsequent weighing link is entered; if the calibration is unqualified, it is corrected through the controller, and then the subsequent weighing link is entered after the correction is completed; weighing errors are avoided.

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the present invention.

[0036] Figure 2 is Figure 1 the left view of

[0037] Figure 3 is Figure 1 the A-A sectional view of

[0038] Figure 4 It is a schematic diagram of the connection relationship between the powder screw scale and the mounting bracket of the present invention.

[0039] Figure 5 is Figure 4 the left view of

[0040] Figure 6 It is a schematic structural diagram of the powder loosening mechanism of the present invention.

[0041] Figure 7 is Figure 6 the right view of

[0042] Figure 8 It is the front view of the automatic weighing calibration mechanism of the present invention.

[0043] Figure 9 It is the left view of the automatic weighing calibration mechanism of the present invention.

[0044] Figure 10 It is the top view of the automatic weighing calibration mechanism of the present invention.

[0045] Figure 11 It is the circuit principle block diagram of the present invention.

[0046] Figure 12 It is the flow chart of the method of the present invention.

[0047] Description of the Reference Numerals:

[0048] 1 - powder bin; 2-1 - bladder cylinder; 2-2 - bladder valve fixing plate;

[0049] 2-3 - claw fixing plate; 2-4 - weight support seat; 2-4-1 - weight support bottom plate;

[0050] 2-4-2 - weight fixing plate; 2-5 - weight;

[0051] 2-6 - second claw; 2-7 - first claw; 2-8 - U-shaped fixing bolt;

[0052] 2-9—Connecting shaft; 2-10—Second bearing housing; 3—First weighing sensor;

[0053] 4—Butterfly valve; 5—Powder weighing hopper; 6—Powder weighing rotary valve;

[0054] 7—Ventilation hose; 8—Second weighing sensor; 9—Powder screw weigher;

[0055] 10—Second encoder; 11—First encoder; 12—Air assistor;

[0056] 13-1—Pneumatic motor; 13-2—First bearing housing; 13-3—Rotating shaft;

[0057] 13-4—Loosening blade; 13-5—Support base; 14—Support column;

[0058] 15—Horizontal connection frame; 16—Bottom plate; 17—Connection rib;

[0059] 18—Powder channel; 19—Mounting bracket; 19-1—Mounting cross bar;

[0060] 19-2—Mounting vertical bar; 19-3—Connection cross bar; 20—Connection ear;

[0061] 21—Second support rod; 22—Auxiliary connecting rod; 23—Auxiliary support rod;

[0062] 24—Connecting rod; 25—Fixing part; 26—Piston rod;

[0063] 27—Lifting lug; 28—Lifting rod; 29—First support rod;

[0064] 30—Controller; 31—Memory; 32—Mounting rod. Detailed implementation manner

[0065] As Figures 1 to 11 shown, the present invention includes a weighing rack vertically arranged on the ground, a powder bin 1 vertically arranged on the upper part of the weighing rack, a powder weighing hopper 5 vertically arranged below the powder bin 1, and a powder double weighing and metering mechanism arranged at the bottom of the weighing rack and disposed at the discharge port of the powder weighing hopper 5;

[0066] A powder channel 18 is vertically arranged at the discharge port of the powder bin 1, and the powder channel 18 is vertically disposed between the discharge port of the powder bin 1 and the inlet of the powder weighing hopper 5; a butterfly valve 4 is horizontally arranged in the powder channel 18; the butterfly valve 4 is controlled by the controller 30;

[0067] A powder loosening mechanism is horizontally arranged in the powder weighing hopper 5; a plurality of air assist flow devices 12 are arranged on the inner side wall of the powder weighing hopper 5, and the plurality of air assist flow devices 12 are uniformly arranged along the circumferential direction of the powder weighing hopper 5;

[0068] The powder double weighing mechanism includes a powder weighing rotary valve 6 arranged at the discharge port of the powder weighing hopper 5 and a powder screw weigher 9 horizontally arranged below the powder weighing rotary valve 6 and connected to the powder weighing rotary valve 6. The powder screw weigher 9 is installed on the weighing frame through a mounting bracket 19. The powder weighing rotary valve 6 and the powder screw weigher 9 are connected through a breathable hose 7; a first encoder 11 is arranged on the powder weighing rotary valve 6, a second encoder 10 is arranged on the powder screw weigher 9, and both the first encoder 11 and the second encoder 10 are connected to a controller 30;

[0069] Two groups of weighing components are symmetrically arranged at the top of the powder weighing hopper 5. A first automatic weighing calibration mechanism is connected to each group of weighing components. The weighing components include two first weighing sensors 3, and the two first weighing sensors 3 are respectively arranged at the top of the powder weighing hopper 5 and on the same side of the powder weighing hopper 5; one end of the first weighing sensor 3 is connected to the top of the powder weighing hopper 5 through a lifting lug 27, the other end of the first weighing sensor 3 is connected to one side of the first automatic weighing calibration mechanism through a suspension rod 28, and the other side of the first automatic weighing calibration mechanism is connected to the top of the powder weighing hopper 5 through two first support rods 29;

[0070] A second weighing sensor 8 is arranged at the end of the powder screw weigher 9 far from the powder weighing hopper 5, and a second automatic weighing calibration mechanism is connected to the second weighing sensor 8; one end of the second weighing sensor 8 is installed on a support column 14 through a horizontally arranged mounting rod 32, and the other end of the second weighing sensor 8 is installed on the outer side surface of the powder screw weigher 9; one side of the second automatic weighing calibration mechanism is connected to the weighing frame through a second support rod 21, and the other side of the second automatic weighing calibration mechanism is installed on the mounting bracket 19; both the first weighing sensor 3 and the second weighing sensor 8 are connected to the controller 30, and a memory 31 is connected to the controller 30;

[0071] The structures of the first automatic weighing calibration mechanism and the second automatic weighing calibration mechanism are the same. The first automatic weighing calibration mechanism and the second automatic weighing calibration mechanism both include a bladder cylinder 2-1, a connection assembly connected to one side of the bladder cylinder 2-1, a pawl assembly connected to the connection assembly, and a weight 2-5 arranged on the pawl assembly; the connection assembly includes a bladder valve fixing plate 2-2 vertically arranged on one side of the bladder cylinder 2-1, two pawl fixing plates 2-3 both vertically arranged on the upper side of the bladder valve fixing plate 2-2 and symmetrically arranged, and a connecting shaft 2-9 horizontally connected between the two pawl fixing plates 2-3; the pawl assembly includes two first pawls 2-7 both vertically connected to the connecting shaft 2-9 and a second pawl 2-6 vertically arranged between the two first pawls 2-7 and arranged on the connecting shaft 2-9, and the weight 2-5 is horizontally arranged on the two first pawls 2-7 and the second pawl 2-6; the connecting shaft 2-9 is fixedly connected to the two first pawls 2-7, the upper part of the connecting shaft 2-9 is fixedly connected to the second pawl 2-6, and the piston rod 26 of the bladder cylinder 2-1 horizontally passes through the bladder valve fixing plate 2-2 and is hingedly connected to the lower part of the second pawl 2-6.

[0072] During actual use, through the powder double weighing and metering mechanism, the first weighing is the set weighing value, and the second weighing is the actual weighing value. By measuring the powder released for the second time, the actual powder weight value is obtained, avoiding the situation where the weighed powder weight is inconsistent with the powder weight entering the mixing equipment, and ensuring the qualification rate of the finished mixture.

[0073] Among them, a first automatic weighing calibration mechanism is arranged on the first weighing sensor 3, and a second automatic weighing calibration mechanism is connected to the second weighing sensor 8. By calibrating the sensors before starting up, the work of carrying weights in traditional calibration is avoided, heavy physical labor is not required, the safety risk during weight handling is reduced, and a large amount of time cost is saved.

[0074] In addition, a powder loosening mechanism is arranged in the powder weighing hopper 5. The powder can be loosened by the rotation of the loosening blade 13-4 to prevent caking; in addition, an air booster 12 is arranged in the powder weighing hopper 5, which can uniformly send a large amount of dry and high-pressure air into the powder weighing hopper 5 to make the powder fluffy and eliminate arching.

[0075] The method steps of the present invention are simple. First, the first automatic weighing calibration mechanism is used to calibrate the first weighing sensor 3, and then the second automatic weighing calibration mechanism is used to calibrate the second weighing sensor 8. If the calibration is qualified, the subsequent weighing link is entered; if the calibration is unqualified, it is corrected through the controller 30, and after the correction is completed, the subsequent weighing link is entered; weighing errors are avoided.

[0076] It should be noted that when the powder is weighed once, it is measured by volume. When the powder weighing rotary valve 6 is selected, the amount of powder released is determined each time the powder weighing rotary valve 6 is rotated. The first encoder 11 is used to know the rotation speed of the powder weighing rotary valve 6. The weight of the released powder is obtained by the rotation speed and the known amount of powder released by the rotation. When the powder is weighed a second time for weight measurement, the second weighing sensor 8 is used to weigh the powder released into the powder spiral scale 9 to obtain the actual weight of the powder released. The main function of the second encoder 10 is to control the rotation speed of the powder spiral scale 9, control the spiral speed to control the spiral output, and control the speed of the powder entering the mixing equipment. It can work in conjunction with the rotary valve.

[0077] In actual use, the model of the powder weighing rotary valve 6 is YJ-HX20; when unloading is required, the butterfly valve 4 is opened, and the powder in the powder bin 1 is discharged into the powder weighing hopper 5 through the powder channel 18. Figure 1 As shown, the ends of the second weighing sensor 8 are connected to the mounting rod 32 and the powder auger scale 9, respectively, via lugs 27. The air flow aid 12 uses a sudden burst of compressed gas, exceeding the speed of Mach 1, to directly impact the blocked fault zone where the bulk powder is stored. This sudden release of expansion shockwave overcomes the static friction of the powder, restoring the flow of the powder within the powder scale hopper 5. The air hose 7 is made of an air-permeable filter. The memory 31 stores a program for calibrating the sensor.

[0078] like Figure 1 and Figure 2 As shown, in this embodiment, the weighing rack includes four vertically arranged support columns 14 and multiple horizontal connecting frames 15 horizontally arranged between the four support columns 14. A bottom plate 16 is horizontally arranged at the bottom of the support column 14, and a connecting rib 17 is obliquely arranged between the support column 14 and the bottom plate 16. The four support columns 14, the multiple connecting frames 15, the bottom plate 16, and the connecting rib 17 are formed as one piece.

[0079] In actual use, the main function of the weighing rack is to install the powder silo 1, the powder weighing hopper 5, and the powder double-weighing metering mechanism; a through hole is opened on the bottom plate 16, and the metering device can be installed on the ground by bolts to ensure the stability of the device.

[0080] like Figure 1 、 Figure 2 、 Figure 6 and Figure 7As shown, in this embodiment, the powder loosening mechanism includes a rotating shaft 13-3 horizontally penetrating through the powder weighing hopper 5, a plurality of loosening blades 13-4 all arranged on the rotating shaft 13-3, and a pneumatic motor 13-1 arranged at the end of the rotating shaft 13-3 and disposed outside the powder weighing hopper 5. Both ends of the rotating shaft 13-3 are installed on the powder weighing hopper 5 through support seats 13-5, and a first bearing seat 13-2 for installing the rotating shaft 13-3 is arranged on the support seat 13-5.

[0081] During actual use, the pneumatic motor 13-1 is driven by high-pressure gas as power. The pneumatic motor 13-1 drives the rotating shaft 13-3 to rotate, and then drives the loosening blades 13-4 to rotate, so as to loosen the powder and prevent caking. The powder loosening mechanism works alternately or simultaneously with the air assistor 12 to enable the powder to flow out smoothly. The powder loosening mechanism does not work when the powder enters the powder weighing hopper 5 from the powder bin 1 to minimize interference with the sensor. As Figure 6 and Figure 7 shown, the loosening blades 13-4 are installed on the rotating shaft 13-3 through connecting plates.

[0082] As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, in this embodiment, one end of the mounting bracket 19 is installed on the horizontal connecting frame 15 at the bottom of the weighing frame through a connecting member, and the other end of the mounting bracket 19 is connected to the second automatic weighing calibration mechanism; the mounting bracket 19 includes two mounting crossbars 19-1 both horizontally arranged on the lowermost horizontal connecting frame 15 and two mounting vertical bars 19-2 both vertically arranged at the ends of the mounting crossbars 19-1. Two connecting crossbars 19-3 are connected between the two mounting crossbars 19-1. The two mounting crossbars 19-1, the two mounting vertical bars 19-2, and the two connecting crossbars 19-3 are integrally formed; a connecting ear 20 is vertically arranged at the end of the mounting crossbar 19-1 away from the mounting vertical bar 19-2.

[0083] During actual use, the mounting bracket 19 is used to install and support the powder screw weigher 9.

[0084] As Figure 3 、 Figure 6 and Figure 7As shown in the figure, in this embodiment, the connecting member includes an auxiliary connecting rod 22 horizontally disposed between the transverse connecting frames 15 at the bottom of the weighing rack, two auxiliary support rods 23 vertically disposed on the auxiliary connecting rod 22, and a connecting rod 24 horizontally connected between the auxiliary support rod 23 and the connecting ear 20. The connecting rod 24 is installed between the auxiliary support rod 23 and the connecting ear 20 by bolts.

[0085] During actual use, the mounting bracket 19 is mounted on the weighing rack by using the connecting member to ensure the stability of the mounting bracket 19.

[0086] As Figure 1 , Figure 2 , Figure 8 , Figure 9 and Figure 10 As shown in the figure, in this embodiment, weight supports 2-4 are provided at both ends of the weight 2-5, and the weight 2-5 and the weight support 2-4 are connected by a U-shaped fixing bolt 2-8; the weight support 2-4 in the first automatic weighing calibration mechanism is connected to the first weighing sensor 3 through a suspension rod 28; the weight support 2-4 in the second automatic weighing calibration mechanism is connected to the transverse connecting frame 15 at the bottom of the weighing rack through a second support rod 21.

[0087] As Figure 1 , Figure 2 , Figure 8 , Figure 9 and Figure 10 As shown in the figure, in this embodiment, the leather bag cylinder 2-1 and the leather bag valve fixing plate 2-2 are connected by a plurality of fixing members 25, and a bearing seat two 2-10 is connected to the end of the connecting shaft 2-9; the leather bag valve fixing plate 2-2 in the first automatic weighing calibration mechanism is installed between two first support rods 29, and the leather bag valve fixing plate 2-2 in the second automatic weighing calibration mechanism is installed between two mounting vertical rods 19-2.

[0088] As Figure 8 , Figure 9 and Figure 10 As shown in the figure, in this embodiment, the weight support 2-4 includes a horizontally disposed weight support bottom plate 2-4-1 and three weight fixing plates 2-4-2 vertically disposed on the top surface of the weight support bottom plate 2-4-1. The weight support bottom plate 2-4-1 and the three weight fixing plates 2-4-2 are integrally formed; the weight fixing plate 2-4-2 is a right trapezoidal structural plate, and the three weight fixing plates 2-4-2 are arranged perpendicular to each other. The right-angled waists of the three weight fixing plates 2-4-2 are uniformly arranged at positions away from the center of the weight support bottom plate 2-4-1, and the three weight fixing plates 2-4-2 enclose a bearing seat for installing the weight 2-5.

[0089] As shown Figure 10 in the figure, fixing holes for installing the U-shaped fixing bolt 2-8 are formed on the weight support bottom plate 2-4-1.

[0090] As shown Figures 1 to 12 in the figure, a method for weighing powder materials and calibrating sensors by a powder material metering device and method with an automatic calibration function includes the following steps:

[0091] Step 1, data storage: Store the designed rotation speed of the powder weighing rotary valve 6, the weight of the weight 2-5, the weight of the powder screw weigher 9, and the upper limit value and lower limit value of the powder weight carried in the powder weighing hopper 5 in the memory 31;

[0092] Step 2, calibrate the sensor, and the process is as follows:

[0093] Step 201, calibrate the first weighing sensor: The controller 30 controls the piston rod 26 of the leather bag cylinder 2-1 to extend, the second supporting claw 2-6 rises driven by the piston rod 26, the connecting shaft 2-9 connected to the second supporting claw 2-6 also rises accordingly, and the first supporting claw 2-7 connected to the connecting shaft 2-9 also rises, so that both the first supporting claw 2-7 and the second supporting claw 2-6 contact the weight 2-5 to lift the weight 2-5, and the weight of the weight 2-5 is directly applied to the first weighing sensor 3. The first weighing sensor 3 measures the weight of the weight 2-5. When the measured value of the first weighing sensor 3 is equal to the weight value stored in the memory 31, execute Step 202; otherwise, the controller 30 calibrates the first weighing sensor 3, and after the calibration is completed, execute Step 202;

[0094] Step 202, calibrate the second weighing sensor: The controller 30 controls the piston rod 26 of the leather bag cylinder 2-1 to extend, the second supporting claw 2-6 rises driven by the piston rod 26, the connecting shaft 2-9 connected to the second supporting claw 2-6 also rises accordingly, and the first supporting claw 2-7 connected to the connecting shaft 2-9 also rises, so that both the first supporting claw 2-7 and the second supporting claw 2-6 contact the weight 2-5 to lift the weight 2-5, and the weight of the weight 2-5 is directly applied to the second weighing sensor 8. The second weighing sensor 8 measures the weight of the powder screw weigher 9. When the measured value of the second weighing sensor 8 is equal to the weight value stored in the memory 31, execute Step 3; otherwise, the controller 30 calibrates the second weighing sensor 8, and after the calibration is completed, execute Step 3;

[0095] Step 3. Material discharging: The controller 30 controls the butterfly valve 4 to open, and the powder material is discharged from the powder bin 1 into the powder weighing hopper 5; the first weighing sensor 3 weighs the powder material entering the powder weighing hopper 5, and when the weight of the powder material in the powder weighing hopper 5 reaches the upper limit value stored in the memory 31, the controller 30 controls the butterfly valve 4 to close;

[0096] Step 4. Primary weighing of the powder material: Start the powder weighing rotary valve 6, and the powder material enters the powder weighing rotary valve 6 from the powder weighing hopper 5. The first encoder 11 measures the rotation speed of the powder weighing rotary valve 6 to obtain the set weight value of the powder material;

[0097] Step 5. Secondary weighing of the powder material: Start the powder screw weigher 9, and the powder material continues to be discharged into the powder screw weigher 9. The second weighing sensor 8 weighs the powder material entering the powder screw weigher 9 to obtain the actual weight value of the powder material;

[0098] Step 6. Refilling: The first weighing sensor 3 measures the weight of the powder material in the powder weighing hopper 5. When the weight of the powder material in the powder weighing hopper 5 reaches the lower limit value stored in the memory 31, the controller 30 controls the butterfly valve 4 to open; repeat Steps 3 to 5 until all the powder material is discharged.

[0099] In Step 5, the weight value of the powder screw weigher 9 is stored in the memory 31. The measured value of the second weighing sensor 8 is the sum of the weight value of the powder screw weigher 9 and the weight of the discharged powder material. The weight value of the discharged powder material is the measured value of the second weighing sensor 8 minus the weight value of the powder screw weigher 9.

[0100] In this embodiment, in Step 4, during the process of the powder material entering the powder weighing rotary valve 6, start the powder loosening mechanism and multiple air assistors 12 to loosen and disperse the powder material entering the powder weighing rotary valve 6 to make the powder material discharge evenly.

[0101] The above is only a preferred embodiment of the present invention and does not impose any limitation on the present invention. Any simple modification, change, and equivalent structural change made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A powder metering device with an automatic checking function, characterized in that: It includes a weighing rack vertically arranged on the ground, a powder bin (1) vertically arranged above the weighing rack, a powder weighing hopper (5) vertically arranged below the powder bin (1), and a powder double weighing and metering mechanism arranged at the bottom of the weighing rack and at the discharge port of the powder weighing hopper (5); the weighing rack includes four vertically arranged support columns (14) and a plurality of horizontally arranged transverse connection frames (15) between the four support columns (14); A powder channel (18) is vertically arranged at the discharge port of the powder bin (1), and the powder channel (18) is vertically arranged between the discharge port of the powder bin (1) and the inlet of the powder weighing hopper (5); a butterfly valve (4) is horizontally arranged in the powder channel (18); the butterfly valve (4) is controlled by a controller (30); A powder loosening mechanism is horizontally arranged in the powder weighing hopper (5); a plurality of air assistors (12) are arranged on the inner side wall of the powder weighing hopper (5), and the plurality of air assistors (12) are uniformly arranged along the circumferential direction of the powder weighing hopper (5); The powder double weighing and metering mechanism includes a powder weighing rotary valve (6) arranged at the discharge port of the powder weighing hopper (5) and a powder screw weigher (9) horizontally arranged below the powder weighing rotary valve (6) and connected to the powder weighing rotary valve (6). The powder screw weigher (9) is installed on the weighing rack through a mounting bracket (19). The powder weighing rotary valve (6) and the powder screw weigher (9) are connected through a breathable hose (7); a first encoder (11) is arranged on the powder weighing rotary valve (6), a second encoder (10) is arranged on the powder screw weigher (9), and both the first encoder (11) and the second encoder (10) are connected to the controller (30); Two groups of weighing components are symmetrically arranged at the top of the powder weighing hopper (5), and a first automatic weighing calibration mechanism is connected to each group of weighing components. Each weighing component includes two first weighing sensors (3), and the two first weighing sensors (3) are respectively arranged at the top of the powder weighing hopper (5) and on the same side of the powder weighing hopper (5); one end of the first weighing sensor (3) is connected to the top of the powder weighing hopper (5) through a lifting lug (27), the other end of the first weighing sensor (3) is connected to one side of the first automatic weighing calibration mechanism through a suspension rod (28), and the other side of the first automatic weighing calibration mechanism is connected to the top of the powder weighing hopper (5) through two first support rods (29); At the end of the powder screw weigher (9) far from the powder weighing hopper (5), a second weighing sensor (8) is provided, and a second automatic weighing calibration mechanism is connected to the second weighing sensor (8); one end of the second weighing sensor (8) is installed on one of the support columns (14) through a horizontally arranged mounting rod (32), and the other end of the second weighing sensor (8) is installed on the outer side of the powder screw weigher (9); one side of the second automatic weighing calibration mechanism is connected to the weighing rack through a second support rod (21), and the other side of the second automatic weighing calibration mechanism is installed on the mounting bracket (19); both the first weighing sensor (3) and the second weighing sensor (8) are connected to a controller (30), and a memory (31) is connected to the controller (30). The structures of the first automatic weighing calibration mechanism and the second automatic weighing calibration mechanism are the same. Both the first automatic weighing calibration mechanism and the second automatic weighing calibration mechanism include a bladder cylinder (2-1), a connection component connected to one side of the bladder cylinder (2-1), a claw component connected to the connection component, and a weight (2-5) arranged on the claw component; the connection component includes a bladder valve fixing plate (2-2) vertically arranged on one side of the bladder cylinder (2-1), two claw fixing plates (2-3) both vertically arranged on the upper side of the bladder valve fixing plate (2-2) and symmetrically arranged, and a connecting shaft (2-9) horizontally connected between the two claw fixing plates (2-3); the claw component includes two first claws (2-7) both vertically connected to the connecting shaft (2-9) and a second claw (2-6) vertically arranged between the two first claws (2-7) and arranged on the connecting shaft (2-9), and the weight (2-5) is horizontally arranged on the two first claws (2-7) and the second claw (2-6); a fixed connection is provided between the connecting shaft (2-9) and the two first claws (2-7), a fixed connection is provided between the upper part of the connecting shaft (2-9) and the second claw (2-6), and the piston rod (26) of the bladder cylinder (2-1) horizontally passes through the bladder valve fixing plate (2-2) and is hinged to the lower part of the second claw (2-6).

2. The powder metering device with an automatic checking function according to claim 1, wherein: A bottom plate (16) is horizontally arranged at the bottom of the support column (14), a connecting rib plate (17) is obliquely arranged between the support column (14) and the bottom plate (16), and the four support columns (14), multiple connecting frames (15), the bottom plate (16), and the connecting rib plate (17) are integrally formed.

3. The powder metering device with an automatic checking function according to claim 1, characterized in that: The powder loosening mechanism includes a rotating shaft (13-3) horizontally penetrating through the powder weighing hopper (5), a plurality of loosening blades (13-4) all arranged on the rotating shaft (13-3), and a pneumatic motor (13-1) arranged at the end of the rotating shaft (13-3) and disposed outside the powder weighing hopper (5). Both ends of the rotating shaft (13-3) are installed on the powder weighing hopper (5) through support seats (13-5), and a first bearing seat (13-2) for installing the rotating shaft (13-3) is arranged on the support seat (13-5).

4. The powder metering device with an automatic checking function according to claim 1, characterized in that: One end of the mounting bracket (19) is installed on the horizontal connecting frame (15) at the bottom of the weighing frame through a connecting piece, and the other end of the mounting bracket (19) is connected to the second automatic weighing calibration mechanism; the mounting bracket (19) includes two mounting crossbars (19-1) both horizontally arranged on the lowermost horizontal connecting frame (15) and two mounting vertical bars (19-2) both vertically arranged at the ends of the mounting crossbars (19-1). Two connecting crossbars (19-3) are connected between the two mounting crossbars (19-1). The two mounting crossbars (19-1), the two mounting vertical bars (19-2), and the two connecting crossbars (19-3) are integrally formed; a connecting ear (20) is vertically arranged at the end of the mounting crossbar (19-1) away from the mounting vertical bar (19-2).

5. The powder metering device with an automatic checking function according to claim 4, characterized in that: The connecting piece includes an auxiliary connecting rod (22) horizontally arranged between the lowermost horizontal connecting frames (15) of the weighing frame, two auxiliary support rods (23) both vertically arranged on the auxiliary connecting rod (i22), and a connecting rod (24) horizontally connecting between the auxiliary support rod (23) and the connecting ear (20). The connecting rod (24) is installed between the auxiliary support rod (23) and the connecting ear (20) through bolts.

6. The powder metering device with an automatic checking function according to claim 1, characterized in that: Both ends of the weight (2-5) are provided with weight support seats (2-4), and the weight (2-5) is connected to the weight support seat (Z4) through a U-shaped fixing bolt (2-8); the weight support seat (2-4) in the first automatic weighing calibration mechanism is connected to the first weighing sensor (3) through a suspension rod (28); the weight support seat (2-4) in the second automatic weighing calibration mechanism is connected to the lowermost horizontal connecting frame (15) of the weighing frame through a second support rod (21).

7. The powder metering device with an automatic verification function according to claim 4, characterized in that: The bladder cylinder (2-1) and the bladder valve fixing plate (2-2) are connected through a plurality of fixing pieces (25), and a second bearing seat (2-10) is connected to the end of the connecting shaft (2-9); the bladder valve fixing plate (2-2) in the first automatic weighing calibration mechanism is installed between two first support rods (29), and the bladder valve fixing plate (2-2) in the second automatic weighing calibration mechanism is installed between the two mounting vertical bars (19-2).

8. The powder metering device with an automatic checking function according to claim 6, characterized in that: The weight support base (2-4) includes a horizontally arranged weight support bottom plate (2-4-1) and three weight fixing plates (2-4-2) that are all vertically arranged on the top surface of the weight support bottom plate (2-4-1). The weight support bottom plate (2-4-1) and the three weight fixing plates (2-4-2) are integrally formed. The weight fixing plate (2-4-2) is a right trapezoidal structural plate. The three weight fixing plates (2-4-2) are arranged perpendicular to each other. The right-angled waists of the three weight fixing plates (2-4-2) are evenly arranged at positions away from the center of the weight support bottom plate (2-4-1). The three weight fixing plates (2-4-2) enclose a bearing seat for installing the weight (2-5).

9. A method for powder metering using the powder metering device with an automatic verification function according to claim 1, characterized in that: It includes the following steps: Step 1, data storage: Store the designed rotation speed of the powder weighing rotary valve (6), the weight of the weight (2-5), the weight of the powder screw weigher (9), and the upper limit value and lower limit value of the powder weight carried in the powder weighing hopper (5) in the memory (31). Step 2, calibrate the sensor, the process is as follows: Step 201, calibrate the first weighing sensor: The controller (30) controls the piston rod (26) of the bladder cylinder (2-1) to extend. The second pawl (2-6) rises under the drive of the piston rod (26). The connecting shaft (2-9) connected to the second pawl (2-6) also rises accordingly. The first pawl (2-7) connected to the connecting shaft (2-9) also rises, so that both the first pawl (2-7) and the second pawl (2-6) contact the weight (2-5) to lift the weight (2-5). The weight of the weight (2-5) is directly applied to the first weighing sensor (3). The first weighing sensor (3) measures the weight of the weight (2-5). When the measured value of the first weighing sensor (3) is equal to the weight value stored in the memory (31), execute step 202; otherwise, the controller (30) corrects the first weighing sensor (3), and after the calibration is completed, execute step 202; Step 202, calibrate the second weighing sensor: The controller (30) controls the piston rod (26) of the bladder cylinder (2-1) to extend. The second pawl (2-6) rises under the drive of the piston rod (26). The connecting shaft (2-9) connected to the second pawl (2-6) also rises accordingly. The first pawl (2-7) connected to the connecting shaft (2-9) also rises, so that both the first pawl (2-7) and the second pawl (2-6) contact the weight (2-5) to lift the weight (2-5). The weight of the weight (2-5) is directly applied to the second weighing sensor (8). The second weighing sensor (8) measures the weight of the powder screw weigher (9). When the measured value of the second weighing sensor (8) is equal to the weight value stored in the memory (31), execute step three; otherwise, the controller (30) corrects the second weighing sensor (8), and after the calibration is completed, execute step three; Step 3. Material discharging: The controller (30) controls the butterfly valve (4) to open, and the powder material is discharged from the powder silo (1) into the powder weighing hopper (5); the first weighing sensor (3) weighs the powder material entering the powder weighing hopper (5), and when the weight of the powder material in the powder weighing hopper (5) reaches the upper limit value of the weight stored in the memory (31), the controller (30) controls the butterfly valve (4) to close; Step 4. Primary weighing of the powder material: Start the powder weighing rotary valve (6), and the powder material enters the powder weighing rotary valve (6) from the powder weighing hopper (5). The first encoder (11) measures the rotation speed of the powder weighing rotary valve (6) to obtain the set weight value of the powder material; Step 5. Secondary weighing of the powder material: Start the powder screw weigher (9), and the powder material continues to be discharged into the powder screw weigher (9). The second weighing sensor (8) weighs the powder material entering the powder screw weigher (9) to obtain the actual weight value of the powder material; Step 6. Refilling: The first weighing sensor (3) measures the weight of the powder material in the powder weighing hopper (5). When the weight of the powder material in the powder weighing hopper (5) reaches the lower limit value of the weight stored in the memory (31), the controller (30) controls the butterfly valve (4) to open; repeat Steps 3 to 5 until all the powder materials are discharged.

10. A method for powder metering using the powder metering device with an automatic verification function according to claim 9, characterized in that: In Step 4, during the process of the powder material entering the powder weighing rotary valve (6), start the powder loosening mechanism and multiple air assistants (12) to loosen and blow the powder material entering the powder weighing rotary valve (6) to make the powder material discharge evenly.

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