Weighing system

Abstract

The utility model discloses a weighing system which comprises weighing sensors arranged on container supporting parts, and all the weighing sensors are used for bearing all weights of containers and are provided with signal generating parts used for generating initial electric signals under the effect of the weights of the containers. The integrating device is in communication connection with the signal generating component and is used for integrating the weight of the container according to the initial electric signals. According to the weighing system, on the premise that the stability of the pneumatic conveying material is not changed, the weight of the pneumatic conveying material can be measured in real time, the weight measuring error can be reduced, and necessary conditions are provided for lean production.

Description

TECHNICAL FIELD

[0001] The utility model relates to material conveying metering equipment technical field more specifically, relate to a kind of weighing system. BACKGROUND

[0002] The existing pneumatic conveying system is mainly composed of a bin pump, a compressed air source, a control system, a conveying pipe and a storage bin, and adopts a bin pump conveying mode.It should be noted that the bin pump conveying is a discontinuous conveying process, and the bin pump can be a standard bin pump with an inlet and outlet valve, a material conveying pipe, an air inlet pipe and a bin.Before feeding the bin pump, the bin is filled with the conveyed material, and all valves are closed.The whole working process is as follows:(1) open the inlet valve and the exhaust valve, and feed the bin pump under normal pressure until the bin is full indicated by the level meter;(2) close the inlet valve and the exhaust valve, and then open the high-pressure valve to pressurize the tank;(3) when the operating pressure is reached, open the conveying air valve and the discharge valve, and the material starts to be conveyed;(4) the pressure switch, level meter or time relay displays the end of conveying, and at this time, the high-pressure valve and the discharge valve are closed, so that all compressed air is used to blow the conveying pipe, and the exhaust valve is opened to reduce the pressure in the tank to normal pressure.After one working cycle is completed, another cycle continues.

[0003] In the above-mentioned pneumatic conveying system, since the powder material is fed into the bin pump at a certain period, and the amount of material fed each time varies greatly, it is difficult to detect the density of the gas-solid mixed material in the bin pump, so the formula m=ρV cannot be used to effectively measure the weight of the powder material.

[0004] The current common weight measurement means is to calculate the amount of conveyed powder material by the produced product, or to accumulate in the storage bin and measure the weight by the weigher after loading, but the existing measurement methods belong to post-measurement, and cannot achieve real-time measurement, so as to meet the demand of lean production. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a kind of weighing system, can carry out real-time weight measurement of the material conveyed by pneumatic conveying under the premise of not changing the stability of pneumatic conveying material, can reduce the error of weight measurement, and provides necessary conditions for realizing lean production.

[0006] The weighing system provided by the utility model comprises a weighing sensor arranged on each container support part, and all the weighing sensors are used to bear the weight of the container and have a signal generating part for generating an initial electric signal under the weight of the container.

[0007] The weighing system further comprises a calculating device connected to the signal generating component and configured to calculate the weight of the container according to the initial electric signal.

[0008] Preferably, in the weighing system, each of the container supporting parts comprises an upper supporting unit and a lower supporting unit.

[0009] The weighing sensor is installed between the bottom of the upper supporting unit and the top of the lower supporting unit.

[0010] All the weighing sensors are located at the same height position, and the top of the upper supporting unit is fixed with the bottom of the container.

[0011] Preferably, in the weighing system, the upper supporting unit and the lower supporting unit are both steel pipes.

[0012] The bottom of the upper supporting unit and the top of the lower supporting unit are respectively fixed with a first steel plate and a second steel plate in a horizontal direction, and the thickness of the first steel plate and the second steel plate ranges from 8mm to 12mm.

[0013] The weighing sensor is detachably arranged between the first steel plate and the second steel plate.

[0014] Preferably, in the weighing system, the weighing system further comprises a feeding pipe body and a discharging pipe body connected to the container.

[0015] The feeding pipe body is installed between the container and a feeding valve.

[0016] The discharging pipe body is installed at the end of the discharging valve away from the container.

[0017] Preferably, in the weighing system, the feeding pipe body is a corrugated pipe or a cloth bag with both ends bound and fixed.

[0018] The discharging pipe body is a corrugated pipe.

[0019] Preferably, in the weighing system, the calculating device further comprises a weight display unit.

[0020] Preferably, in the weighing system, the weighing system further comprises a central controller connected to the calculating device, the feeding valve and the discharging valve to control the material conveying process and calculate the weight of the material corresponding to each material conveying process.

[0021] Preferably, in the weighing system, the weighing system further comprises a high material level switch and a low material level switch connected to the central controller.

[0022] The high material level switch is located at a position 180mm to 220mm below the top of the container.

[0023] The low material level switch is located at a position 250-300 mm above the bottom of the container.

[0024] Preferably, in the above-mentioned weighing system, the signal generating component is a strain gauge.

[0025] Preferably, in the above-mentioned weighing system, the number of the weighing sensors and the number of the container supporting parts are equal, and each of them is 3 or 4.

[0026] As can be seen from the above technical solution, the above-mentioned weighing system provided by the present application comprises the weighing sensors arranged on each of the container supporting parts, all of the weighing sensors are used to bear the weight of the container and have signal generating components for generating initial electrical signals under the weight of the container, and further comprises the accumulation device in communication connection with the signal generating components and used to accumulate the weight of the container according to the initial electrical signals, so that the weighing system can detect the real-time weight of the container before and after the material enters the container, and thus can measure the real-time weight of the material in pneumatic conveying without changing the stability of the material in pneumatic conveying, which can reduce the error of weight measurement and provide necessary conditions for realizing lean production. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0028] Figure 1 The overall schematic diagram of the embodiment of the weighing system provided by the present application;

[0029] Figure 2 The electrical connection schematic diagram of the weighing system provided by the present application. DETAILED DESCRIPTION

[0030] The core of the present application is to provide a weighing system, which can detect the real-time weight of the container before and after the material enters the container, measure the real-time weight of the material in pneumatic conveying without changing the stability of the material in pneumatic conveying, and reduce the error of weight measurement, thereby providing necessary conditions for realizing lean production.

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0032] The embodiment of the weighing system provided by the present application comprises Figure 1 and Figure 2 as shown in the drawings, Figure 1 is a whole schematic view of the embodiment of the weighing system provided by the present application, Figure 2 is an electric connection schematic view of the weighing system provided by the present application. The weighing system can comprise a weighing sensor 2 arranged on each container supporting part 1. All the weighing sensors 2 are used to bear all the weight of the container 3 and have a signal generating part 21 for generating an initial electric signal under the weight of the container 3. The signal generating part 21 can be preferably a strain gauge. The strain of the strain gauge is proportional to the pressure borne by the strain gauge. Thus, the weight can be characterized by the strain. A remote pressure gauge 31 capable of displaying pressure can be arranged on the container 3. The shape of the container 3 can be as shown in Figure 1 . The upper part of the container 3 is cylindrical and the lower part is conical. The lowermost part has a hole for discharging. Other shapes can also be selected according to actual needs. The shape is not limited here.

[0033] The weighing system is suitable for pneumatic conveying of powder materials, especially for weighing and metering of phosphogypsum β powder during pneumatic conveying. It should be noted that the initial electric signals from the plurality of weighing sensors 2 are weighted and averaged by a wiring terminal circuit matched with the accumulating device 4, so that a voltage signal representing the final weight can be obtained.

[0034] It needs to be explained that, since the whole weight of the container 3 and the material inside it is all pressed on the weighing sensor 2, the weighing sensor 2 can be caused to be pressed, and can be deformed to cause the change of the resistance value of the built-in resistance, the change of the resistance value is calculated by the circuit in the calculating device 4, and then the current flowing inside is changed, which can generate a corresponding initial electric signal, different pressures correspond to different current sizes, and the initial electric signal becomes the voltage signal after processing, which can represent the final weight, an initial weight can be weighed before feeding, and then a subsequent weight can be weighed after feeding is completed, and the weight of the powder material entering in the feeding stage is obtained by subtracting the initial weight from the subsequent weight. It can be seen that the weighing system can be used to measure the weight of each feeding process, and the accurate weight value of each feeding is obtained, thereby helping the lean production.

[0035] As can be seen from the above technical solution, in the embodiment of the weighing system provided by the utility model, the weighing sensor is arranged on each container support part, all the weighing sensors are used to bear the weight of the container and have signal generating parts for generating initial electric signals under the weight of the container, and the calculating device in communication connection with the signal generating parts is used to calculate the weight of the container according to the initial electric signals, so the weighing system can perform real-time weight detection, the conveying system does not need to be closed, and therefore the weight of the material conveyed by the pneumatic conveying system can be measured in real time without changing the stability of the material conveyed by the pneumatic conveying system, the error of weight measurement can be reduced, and necessary conditions for realizing the lean production are provided.

[0036] In one specific embodiment of the weighing system, each container support part 1 can include an upper support unit 11 and a lower support unit 12, that is, the existing container support part 1 is divided into two parts, the two parts are aligned in the vertical direction to ensure that the transmission of the pressure is along the vertical direction, and the container will not be tilted;

[0037] The weighing sensor 2 is installed between the bottom of the upper support unit 11 and the top of the lower support unit 12, so that the weight of the container 3 acts on the upper support unit 11 first, and then is transmitted to the weighing sensor 2, and the lower part of the weighing sensor 2 is supported by the lower support unit 12, because each weighing sensor can bear the weight of the corresponding container supported by the container support part 1, so the weight can be represented;

[0038] All the weighing sensors 2 are located at the same height position, the top of the upper support unit 11 is fixed with the bottom of the container 3, it is necessary to point out that each weighing sensor 2 is at the same height, which can ensure that the detection of the container weight is more accurate, and the same height can better ensure that the deformation at the height position is consistent, so that the container can be better ensured to be in the horizontal direction and not to be skewed, so it is safer in the production process.

[0039] Further, the upper support unit 11 and the lower support unit 12 can be preferably steel pipes, specifically, the container support part can be selected according to the size of the bin pump, which has high strength, stronger support and longer service life, so it can ensure more sustainable and effective support for the container 3, thereby being safer;

[0040] The bottom of the upper support unit 11 and the top of the lower support unit 12 are respectively fixed with first and second steel plates with a thickness range of 8mm to 12mm in the horizontal direction, it is necessary to point out that since the steel pipe is hollow, the weighing sensor 2 cannot be installed in the cavity, so the first steel plate can be used to seal the bottom of the upper support unit 11, and the second steel plate can be used to seal the top of the lower support unit 12, so that the weighing sensor 2 can be safely and stably placed between the first and second steel plates, which has high strength and will not deform when bearing pressure, so that the weight detection can be more accurate, for example, a 10mm thick steel plate can be used to make the first and second steel plates with a cross-sectional size of 30mm*30mm (depending on the diameter of the support round steel), of course, other structures can be selected according to actual needs to carry the weighing sensor, which is not limited here, and the outer periphery of the second steel plate at the lower side has an upward convex barrier part, the diameter of the first steel plate is slightly smaller than that of the second steel plate, and the first steel plate is placed inside the barrier part of the second steel plate, so that the first and second steel plates can be prevented from being dislocated and separated from each other, which can ensure that the entire structure is more secure and stable;

[0041] Moreover, the weighing sensor 2 is detachably arranged between the first and second steel plates, which can be connected by adhesion, screw connection, clamping and the like, which can be selected according to actual needs, and the detachable connection mode can ensure that when a weighing sensor 2 fails, it can be easily removed and replaced with a non-faulty weighing sensor, thereby improving the maintenance efficiency and reducing the maintenance cost.

[0042] Continue to refer to Figure 1In another specific embodiment of the weighing system, on the basis of the above-mentioned embodiment, the feeding pipe body 5 and the discharging pipe body 6 can be further connected to the container 3, specifically, the feeding pipe body 5 can be preferably a corrugated pipe or a cloth bag with both ends tied and fixed, specifically, the corrugated pipe can be made of 304 stainless steel or 316 stainless steel, because the flushing is relatively serious during the warehouse pump conveying, the use of these two kinds of stainless steel can avoid this situation, and this kind of soft connection will not bear tension or pressure like hard connection, so as not to interfere with the stress of the container, and will not interfere with the accuracy of the weighing, the discharging pipe body 6 can be preferably a corrugated pipe, which will not cause tension or pressure to the objects connected at both ends, so as not to interfere with the accuracy of the weighing, of course, other soft connection methods can also be selected according to actual needs, which is not limited here.

[0043] The feeding pipe body 5 is installed between the container 3 and the feeding valve 7, in this case, when the feeding valve 7 is opened, the material can be fed into the container 3 through the feeding pipe body 5, when the predetermined condition is reached, the feeding valve 7 can be closed to stop the material from being fed into the container 3.

[0044] The discharging pipe body 6 is installed at the end of the discharging valve 8 away from the container 3, in this case, when discharging is needed, the discharging valve 8 can be opened to discharge the material through the discharging pipe body 6, when the discharging is completed, the discharging valve 8 can be closed to stop the material from being discharged.

[0045] In another specific embodiment of the weighing system, continuing to refer to Figure 2 The above-mentioned accumulation device 4 can further include a weight display unit 41, specifically, the weight display unit 41 can be a secondary display meter, which is used to display the weighing result, that is, the current weight of the material in the container, this weight of the material can be calculated by subtracting the weight before the material is input from the weight after the material is input, of course, other methods can also be used, which is not limited here. Further, a central controller 9 can be further included, which is in communication connection with the accumulation device 4, the feeding valve 7 and the discharging valve 8 to control the material conveying process and calculate the weight of the material corresponding to each material conveying process. In this case, the central controller 9 can control the feeding and discharging process and the weight measurement process, which is more efficient and accurate, for example, the central controller 9 can control to measure the weight of the container before feeding, then control to start feeding until the feeding is completed, then control to measure another weight of the container, subtract the two weights to obtain the weight of the powder material entering the container in this stage, and the calculated weight of the material can be transmitted to the weight display unit 41 for display, so that relevant personnel can know the weight in real time.

[0046] In a preferred embodiment of the above weighing system, with continued reference to Figure 1 and Figure 2 The high material level switch 91 and the low material level switch 92 can also be connected in communication with the central controller 9, so that the central controller 9 can obtain the condition that the material in the container 3 reaches the highest limit by using the high material level switch 91, at which time the feeding valve can be closed to avoid the condition of overfilling of the material, and during the discharging process, the central controller 9 can obtain the condition that the material in the container 3 reaches the lowest limit by using the low material level switch 92, at which time the discharging valve can be closed to avoid the condition of overdischarging of the material, so that the automation of the feeding and discharging process can be further improved in this case.

[0047] The high material level switch 91 can be located at a position 180-220 mm below the top of the container 3, so that the material does not exceed the position 180-220 mm below the top of the container 3 to avoid excessive input of the powder material, and the low material level switch 92 can be located at a position 250-300 mm above the bottom of the container 3, so that the material does not fall below the position 250-300 mm above the bottom of the container 3 to ensure that the conveying of the bin pump is not blocked due to excessive discharging, which can be adjusted according to actual needs, but it is necessary to ensure that the capacity of the bin pump is more than two-thirds, and of course, the position can be adjusted adaptively according to actual needs, which is not limited here.

[0048] In each embodiment of the above weighing system, the number of the weighing sensors 2 and the container support parts 1 is preferably equal, and is preferably 3 or 4. It should be noted that three container support parts 1 can ensure a stable support for the container to prevent it from falling over, at which time three weighing sensors 2 can be installed, that is, one weighing sensor 2 is installed on each container support part 1, and four container support parts 1 can be used to form a more stable support for the container according to actual needs, at which time four weighing sensors 2 can be installed, that is, as many container support parts as possible, the more container support parts 1, the more weighing sensors 2 are needed, which is not limited here.

[0049] The central controller used in the above embodiments can be a DCS control system, which can be configured in advance, logically configured, and control programs written to realize the functions of weight calculation of the powder material, setting of the feeding valve opening and closing time, setting of the pressurizing pressure, recording and accumulation of the conveying times, monitoring and control functions of the high-limit alarm of the material level switch, etc.

[0050] With the above weighing sensor, the weight value of the discharging can be based on the voltage signal change, the changed voltage signal is transmitted to the terminal board of the accumulation device for processing, the number of sensors used can be selected in advance on the secondary display table, the signal of the receiving terminal board of the accumulation device is weighted and averaged to compensate, and the output voltage signal is transmitted to the secondary display table for display or cumulative display, which corresponds to the instantaneous mass and cumulative mass. At the same time, the secondary display table can also convert the received voltage signal into a 4-20mA analog signal required by the DCS system through an A / D signal converter, and transmit it to the DCS system for related calculation and logical control. In this case, that is, after the accumulation device processes the weight data of the container, it is converted into an A / D analog signal and transmitted to the control system (DCS) for calculation of the weight of the powder material.

[0051] A specific weight calculation method can be as follows: the central controller sets the pressurization pressure and the opening time of the feeding valve according to the design parameters of the container (bin pump), and uses the opening feedback signal of the discharge valve and the low limit of the bin pump low material level switch as the control condition. When the bin pump completes the first delivery cycle, the discharge valve is closed and the feeding valve is not opened, the control system collects the accumulation data to obtain m1; the second delivery cycle of the bin pump starts, the feeding valve is opened to feed the powder material, and when the set feeding time is reached, the feeding valve is closed. At this time, the control system collects the accumulation data to obtain m2. Using the formula m=m2-m1, the calculated m is the actual delivery mass of the powder material in the first delivery cycle. After such a cycle and accumulation, the delivery weight of the powder material per unit time can be obtained more accurately.

[0052] A specific example is as follows: when performing pneumatic conveying of phosphogypsum β powder, the pneumatic conveying specification of the HD type dense phase bin pump is L-3.0 (downward drawing), the bin pump volume is 3.0m 3 , and the total delivery amount is 200,000 tons / year. On the support part of the original bin pump, three weighing sensors and a metering and accumulating instrument are installed. The weighing sensors sense voltage signals according to the weight they bear, and transmit these voltage signals to the metering and accumulating instrument. The metering and accumulating instrument can perform A / D conversion according to the voltage values of the three weighing sensors, and finally convert them into 4-20mA current signals, and transmit these analog current signals to the DCS control system. Using the control algorithm of the DCS control system, the delivery weight can be measured to ensure the accuracy of the pneumatic conveying measurement, thereby reducing the errors caused by manual calculation and providing a basis for lean production.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A weighing system, characterized in that, Includes a weighing sensor installed on each container support, all of which are used to bear the entire weight of the container and have a signal generating component for generating an initial electrical signal under the action of the container weight; It also includes an integration device that is communicatively connected to the signal generating component for calculating the weight of the container based on the initial electrical signal; Each of the container supports includes an upper support unit and a lower support unit; The weighing sensor is installed between the bottom of the upper support unit and the top of the lower support unit; All weighing sensors are located at the same height, and the top of the upper support unit is fixed to the bottom of the container; Both the upper support unit and the lower support unit are steel pipes; The bottom of the upper support unit and the top of the lower support unit are respectively fixed with a first steel plate and a second steel plate with a thickness ranging from 8mm to 12mm in the horizontal direction. The weighing sensor is detachably disposed between the first steel plate and the second steel plate; The outer periphery of the second steel plate located below has an upwardly convex blocking portion. The diameter of the first steel plate is slightly smaller than the diameter of the second steel plate, and the first steel plate is placed inside the blocking portion of the second steel plate. It also includes an inlet pipe and an outlet pipe that are flexibly connected to the container; The feed pipe is installed between the container and the feed valve; The discharge pipe is installed at the end of the discharge valve furthest from the container; The feed tube is a corrugated pipe or a cloth bag with both ends tied and fixed. The discharge pipe is a corrugated pipe; The totalizing device also includes a weight display unit; It also includes a central controller that is communicatively connected to the totalizing device, the feed valve and the discharge valve to control the material conveying process and calculate the material weight corresponding to each material conveying process; It also includes a high-level switch and a low-level switch that are communicatively connected to the central controller; The high-level switch is located 180mm to 220mm below the top of the container; The low-level switch is located 250mm to 300mm above the bottom of the container; The signal generating component is a strain gauge.

2. The weighing system according to claim 1, characterized in that, The number of weighing sensors and container supports are equal, and each has 3 or 4.

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