Weighing metering type concentrated phase pneumatic conveying system

Abstract

The utility model discloses a weighing metering type concentrated-phase pneumatic conveying system which comprises a conveying pump, a feeding valve and a discharging valve are installed at a top opening and a bottom opening of the conveying pump respectively, the feeding valve is connected with a hopper bottom opening through a blanking pipeline, an isolating valve is installed on the hopper bottom opening, an outlet of the discharging valve is connected with an inlet of a storage tank, and the conveying pump is connected with an outlet of a conveying gas storage tank through a conveying control pipeline. A control valve set is installed on the conveying control pipeline, a pressure discharging pipeline is connected between the discharging pipeline and the bin hopper, a pressure discharging and blowing assembly is installed on the pressure discharging pipeline, the conveying pump is connected with the bin hopper through an exhaust pipeline, and an exhaust assembly is installed on the exhaust pipeline. The conveying pump is suspended on the supporting frame, and weighing sensors are arranged between three supporting lugs evenly distributed outside the conveying pump and the supporting frame. And the blanking pipeline is formed by connecting a blanking flexible joint with two blanking short joints. And pipeline flexible joints are arranged on the pressure discharge pipeline, the exhaust pipeline, the conveying pipeline and the conveying control pipeline. According to the utility model, the material conveying amount can be weighed and metered, so that the material conveying amount in unit time can be accurately controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of concentrated phase pneumatic conveying systems of weighing measurement, belong to material pneumatic conveying technical field. BACKGROUND

[0002] At present, concentrated phase pneumatic conveying technology is widely applied.The existing concentrated phase pneumatic conveying system mainly includes conveying pump, the top inlet of conveying pump is connected with the bottom outlet of bin, the bottom outlet of conveying pump is connected with storage tank via conveying pipeline, the top inlet and bottom outlet of conveying pump are respectively installed with inlet valve and outlet valve, conveying pump is connected with bin by exhaust pipeline, balance valve is arranged on exhaust pipeline, conveying control pipeline is connected between conveying pump and nitrogen storage tank, conveying control valve is arranged on conveying control pipeline.Further, nitrogen storage tank and the outlet of outlet valve are also connected with air supplement pipeline, air supplement control valve is arranged on air supplement pipeline.The existing concentrated phase pneumatic conveying system realizes long-distance, large-capacity and full-closed conveying of material in bin, but when it is applied in production process of food, chemical industry and other fields, for conveying food, chemical raw materials and other materials, the conveying amount of material per unit time needs to be accurately controlled to meet the process requirements.It can be seen that it is an urgent problem to design a concentrated phase pneumatic conveying system that can weigh and measure the conveying amount of material. UTILITARIAN CONTENT

[0003] The utility model aims at providing a kind of concentrated phase pneumatic conveying systems of weighing measurement, which can weigh and measure the conveying amount of material, so as to realize the accurate control of the conveying amount of material per unit time.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The application relates to a weighing and metering type dense-phase pneumatic conveying system, which comprises a conveying pump, a feeding valve and a discharging valve which are respectively arranged at the top and bottom of the conveying pump, a bottom opening of a hopper is connected with the feeding valve through a feeding pipeline, an isolation valve is arranged on the bottom opening of the hopper, an outlet of the discharging valve is connected with an inlet of a storage tank, a pump body of the conveying pump is connected with an outlet of a conveying gas storage tank through a conveying control pipeline, a control valve group is arranged on the conveying control pipeline, a pressure discharge pipeline is arranged between the feeding pipeline and the hopper, a pressure discharge cleaning and blowing assembly is arranged on the pressure discharge pipeline, and an exhaust pipeline is arranged between the pump body of the conveying pump and the hopper, and an exhaust assembly is arranged on the exhaust pipeline.

[0006] The application has the advantages that:

[0007] The application can realize long-distance, large-capacity and full-closed conveying of materials, and realizes weighing and metering of the conveying capacity of the materials, so that the conveying capacity of the materials in unit time can be accurately controlled, the weighing is accurate and reliable, the application is easy to realize, the cost is low, and the production process requirements of food, chemical and other fields can be met. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is a component schematic view of the weighing and metering type dense-phase pneumatic conveying system.

[0009] Figure 2 It is a component schematic view of the weighing and metering type dense-phase pneumatic conveying system. Figure 1 As viewed from above, it is a layout and installation schematic view of the conveying pump on the support frame.

[0010] Figure 3 It is a component schematic view of the weighing and metering type dense-phase pneumatic conveying system. Figure 1 It is an enlarged schematic view of the pressure discharge cleaning and blowing assembly and the exhaust assembly.

[0011] Figure 4 It is a component schematic view of the weighing and metering type dense-phase pneumatic conveying system. Figure 1 It is an installation schematic view of the weighing sensor. PREFERRED EMBODIMENT

[0012] As viewed from above, it is a layout and installation schematic view of the conveying pump on the support frame. Figures 1 to 4The utility model provides a kind of weighing measurement formula dense phase pneumatic conveying system, including conveying pump 10, the top mouth of conveying pump 10, bottom mouth is equipped with feed valve 11, discharge valve 12 respectively, feed valve 11 is connected with the bottom mouth of hopper 30 via blanking pipe, and the bottom mouth of hopper 30 is equipped with isolating valve 31, and the outlet of discharge valve 12 is connected with the inlet of storage tank (not shown in drawing), and the pump body of conveying pump 10 is connected with the outlet of conveying gas storage tank (not shown in drawing) via conveying control pipe 70, and conveying control pipe 70 is equipped with control valve group 72, and blanking pipe and hopper 30 are connected with pressure discharge pipe 50, and pressure discharge pipe 50 is equipped with pressure discharge cleaning and blowing assembly 51, and the pump body of conveying pump 10 is connected with hopper 30 by exhaust pipe 40, and exhaust pipe 40 is equipped with exhaust assembly 41, wherein: conveying pump 10 is suspended on support frame 90, and the outer wall middle part of the pump body of conveying pump 10 is uniformly distributed with three lugs 13 along the circumferential direction of the pump body, and weighing sensor 60 is arranged between each lug 13 and support frame 90;Blanking pipe is composed of two blanking short sections 21, and two blanking short sections 21 are connected by blanking flexible section 22;Pressure discharge pipe 50 connected with hopper 30 is connected with pressure discharge cleaning and blowing assembly 51 by pipe flexible section 84, and exhaust pipe 40 is connected with the outlet of exhaust assembly 41 by pipe flexible section 84, and conveying pipe 77 is connected with the outlet of discharge valve 12 by pipe flexible section 84;Conveying control pipe 70 is connected with the pump body of conveying pump 10 by pipe flexible section 84.

[0013] Generally, the gas inlet of conveying gas storage tank is connected with gas source, and the gas inlet is provided with gas inlet valve.In addition, safety valve, pressure regulating valve and blowdown valve should also be installed on conveying gas storage tank, which is conventional practice, so it is not described here.Conveying gas is usually selected from nitrogen.

[0014] As Figure 1 , conveying gas storage tank outlet and discharge valve 12 outlet are also connected with air supplement pipe 76, air supplement pipe 76 is provided with air supplement valve 760, and the outlet of air supplement valve 760 is connected with orifice plate 81, wherein: air supplement pipe 76 and discharge valve 12 outlet are connected by pipe flexible section 84.

[0015] As Figure 2 , support frame 90 includes square frame formed by four cross beams 92, two connecting beams 93 are connected on the square frame, and vertical legs 91 are connected on the lower surface of the four corners of the square frame, wherein: two connecting beams 93 and one of cross beams 92 constitute a mounting point for mounting three weighing sensors 60, and the three mounting points are uniformly distributed around the center of the square frame;Conveying pump 10 is suspended in the platform formed by square frame and connecting beam 93, and limiting door frame 94 is fixed on connecting beam 93 and corresponding cross beam 92 for mounting weighing sensor 60, and lug 13 passes through limiting door frame 94, as Figure 4The limiting door type frame 94 is used for limiting the supporting lug 13, preventing the conveying pump 10 from rotating, and improving the operation stability of the conveying pump 10.

[0016] In the utility model, the form of the four vertical legs 91 not only ensures the convenient installation of the pipeline connected with the pump body of the conveying pump 10, but also ensures the supporting stability; the weighing sensor 60 is contacted with the pump body through the supporting lug 13, and the weighing accuracy is ensured.

[0017] When the weighing sensor 60 is installed, the conveying pump 10 is first lifted through the supporting lug 13 by the jack, and then the weighing sensor 60 is placed; after the weighing sensor 60 is calibrated, the jack can be removed.

[0018] As Figure 1 The top of the conveying pump 10 is provided with a material level meter 14, the material level meter 14 is used for detecting the height of the material in the pump, so that the material conveying can be started when the material is full; the conveying pump 10 is provided with a pressure gauge 15, and the pressure gauge 15 is used for measuring the internal pressure of the conveying pump 10.

[0019] In the utility model, the conveying pump 10 is a pressure container, and the pump body is preferably in the shape of an inverted triangle; the volume of the conveying pump is between 8m 3 -11m 3 , and the large-capacity and long-distance conveying can be realized.

[0020] As Figure 3 The exhaust pressure blowing assembly 51 comprises an exhaust pressure valve 511 installed on the exhaust pressure pipeline 50; the inlet and outlet of the exhaust pressure valve 511 are connected with a blowing pipeline 514 and a gas supply pipeline 515 respectively; the gas supply pipeline 515 is used for being connected with a gas supply device (not shown in the figure); wherein: the blowing pipeline 514 is provided with a blowing valve 513, and the outlet of the blowing valve 513 is connected with a throttle orifice plate 81; and the gas supply pipeline 515 is provided with a gas supply valve 512.

[0021] As Figure 3 The exhaust assembly 41 comprises an exhaust valve 411 installed on the exhaust pipeline 40, and the outlet of the exhaust valve 411 is provided with a throttle orifice plate 81.

[0022] As Figure 1The total valve 71 is installed on the conveying control pipeline 70, and the outlet of the total valve 71 is divided into three paths, one path is connected with the top of the conveying pump 10 through the upper control pipeline 73, another path is connected with the middle of the conveying pump 10 through the middle control pipeline 74, and the other path is connected with the bottom of the conveying pump 10 through the lower control pipeline 75, wherein: the upper control valve 721 is installed on the upper control pipeline 73, and the outlet of the upper control valve 721 is sequentially connected with the orifice plate 81, the check valve 83 and the pipeline flexible joint 84; the middle control valve 722 is installed on the middle control pipeline 74, and the middle control pipeline 74 is divided into a plurality of branches near the conveying pump 10, and the orifice tube 82 is arranged on each branch, and the outlet of the orifice tube 82 is sequentially connected with the pipeline flexible joint 84 and the check valve 83, and the orifice tubes 82 are uniformly distributed along the circumferential direction of the pump body outside the conveying pump 10; the lower control valve 723 is installed on the lower control pipeline 75, and the outlet of the lower control valve 723 is sequentially connected with the orifice plate 81, the check valve 83 and the pipeline flexible joint 84.

[0023] In the utility model:

[0024] The isolation valve 31 is used for isolating the material in the hopper 30, so as to avoid affecting the weighing accuracy during the weighing and metering.

[0025] The exhaust valve 411 is used for making the pressure in the hopper 30 consistent with the pressure in the conveying pump 10, so that the material can fall into the conveying pump 10 under the action of its own gravity.

[0026] The pressure discharge and blowing assembly 51 is used for discharging the pressure in the material falling pipeline, avoiding the influence of the pressure on the weighing, and performing the blowing treatment when the pressure discharge pipeline 50 is blocked.

[0027] The orifice plate 81 and the orifice tube 82 are used for controlling the gas flow. The check valve 83 is used for preventing the gas from flowing back. The total valve 71 is used for controlling the start and stop of the conveying and air supplement.

[0028] The material falling flexible joint 22 and the pipeline flexible joint 84 are designed to change the rigid connection of the conveying pump 10 and the pipelines into a flexible connection during the weighing and metering, so as to avoid the influence of the pipelines and the devices installed thereon on the weighing, and ensure the accuracy and reliability of the weighing result. Here, considering the device weight and layout and other problems, the pipeline flexible joint 84 is designed at the position of the outlet of the exhaust assembly 41 and the end of the pressure discharge and blowing assembly 51 connected with the hopper 30, that is, the weight of the pressure discharge and blowing assembly 51 and the exhaust assembly 41 is taken into account in the initial state of the weighing conveying pump 10. Similarly, the design of the pipeline flexible joint 84 on the middle control pipeline 74 is also in accordance with the above consideration, and is installed between the orifice tube 82 and the check valve 83, which will not be described here. In summary, the installation positions of the material falling flexible joint 22 and the pipeline flexible joint 84 should be reasonably designed according to the actual situation.

[0029] In the utility model, each valve, each flexible joint, material level meter 14, pressure gauge 15, weighing sensor 60, throttle orifice plate 81 and throttle orifice tube 82 are the well-known technology in the field, so not detailed here.

[0030] In actual implementation, each valve, material level meter 14, pressure gauge 15, weighing sensor 60 are connected with control device and controlled by control device.

[0031] In actual application, first, conveying pump 10 is placed on support frame 90 and weighing sensor 60 is installed, then the pump body of conveying pump 10 is connected with relevant pipeline, device and the like, and then weighing sensor 60 is calibrated.

[0032] Before material conveying, conveying pump 10 and directly connected exhaust pressure blowing assembly 51, exhaust assembly 41, corresponding blanking short joint 21, corresponding check valve 83 (check valve 83 on control pipeline 74) and corresponding pipeline part are weighed by weighing sensor 60, and the weighing result at this time is recorded as initial weight.

[0033] Then open the isolation valve 31 and the feed valve 11, open the exhaust valve 411, the material in the hopper 30 falls into the conveying pump 10 under the action of gravity. When the material level gauge 14 sends a signal indicating that the pump is full of material, the feed valve 11 and the isolation valve 31 are closed, and the pressure relief valve 511 is opened to perform pressure relief on the material falling pipe. When it is necessary to clean and blow the accumulated material in the pressure relief pipe 50 after a long period of operation, the gas supply valve 512 and the blow cleaning valve 513 are opened at this time, and the pressure relief valve 511 remains open, so that the accumulated material in the pressure relief pipe 50 is blown back to the hopper 30, avoiding the blockage of the pressure relief pipe 50 and ensuring the smooth performance of the next pressure relief. When the pressure relief is completed, the total valve 71 is opened, and the conveying gas (nitrogen) is output from the conveying gas storage tank, so that the conveying gas enters the conveying pump 10 through the conveying control pipe 70, and the conveying pump 10 is pressurized. When the pressure in the pump reaches the set value through the pressure gauge 15, the discharge valve 12 is opened, and the material conveying is started. The material in the conveying pump 10 is conveyed to the conveying pipe 77 through the discharge valve 12 under the action of the conveying gas sent through the upper control pipe 73, the middle control pipe 74 and the lower control pipe 75, and finally stored in the storage tank. During the conveying of the material, the weighing sensor 60 performs real-time weighing to obtain the weight of the remaining material in the conveying pump 10 at this time (the actual weight obtained by weighing minus the initial weight), so as to obtain the material conveying amount completed per unit time. When the material conveying amount does not meet the requirement, the upper control valve 721, the middle control valve 722 and the lower control valve 723 can be opened or closed in time according to the actual requirement, so as to speed up or slow down the output of the material from the conveying pump 10, so that the material can be conveyed smoothly according to the required conveying amount. In addition, during the conveying of the material, if the pressure in the conveying pipe 77 (a pressure gauge (not shown in the figure) is installed on the conveying pipe 77) is reduced to a threshold value, the conveying pipe 77 can be continuously pressurized by opening the air supplement valve 760, so as to ensure the continuous conveying of the material. As can be seen from the above, the utility model realizes the real-time weighing of the material in the conveying pump 10, and the real-time monitoring of the weight change of the material, so as to accurately control the material conveying amount per unit time, and meet the production process requirement.

[0034] The utility model has the advantages of:

[0035] The utility model can realize long-distance, large-capacity and full-closed conveying of the material, and realizes the weighing measurement of the material conveying amount, so as to accurately control the material conveying amount per unit time, and the weighing is accurate and reliable, easy to realize, low in cost, and meets the production process requirement in the fields of food and chemical industry.

[0036] The above describes the preferred embodiment of the utility model and the technical principle used, and for the person skilled in the art, any equivalent change, simple replacement and the like based on the technical scheme of the utility model without departing from the spirit and scope of the utility model, all belong to the protection scope of the utility model.

Claims

1. A gravimetrically metered dense phase pneumatic conveying system characterized by, The device comprises a conveying pump, a top port and a bottom port of which are respectively provided with an inlet valve and an outlet valve, the inlet valve is connected with a bottom port of a hopper via a blanking pipeline, the bottom port of the hopper is provided with an isolation valve, the outlet valve is connected with an inlet of a storage tank, a pump body of the conveying pump is connected with an outlet of a conveying gas storage tank via a conveying control pipeline, the conveying control pipeline is provided with a control valve group, the blanking pipeline and the hopper are connected with a pressure relief pipeline, the pressure relief pipeline is provided with a pressure relief and blowing assembly, the pump body of the conveying pump is connected with the hopper via an exhaust pipeline, the exhaust pipeline is provided with an exhaust assembly, wherein: the conveying pump is suspended on a support frame, the pump body of the conveying pump is uniformly provided with three supporting ears, and a weighing sensor is arranged between each supporting ear and the support frame; the blanking pipeline is composed of two blanking short pipes, and the two blanking short pipes are connected via a blanking flexible joint; the pressure relief pipeline connected with the hopper is connected with the pressure relief and blowing assembly via a pipeline flexible joint, the exhaust pipeline is connected with the outlet of the exhaust assembly via a pipeline flexible joint, and the conveying pipeline is connected with the outlet of the outlet valve via a pipeline flexible joint; the conveying control pipeline is connected with the pump body of the conveying pump via a pipeline flexible joint.

2. The gravimetrically metered dense phase pneumatic conveying system of claim 1 wherein, The outlet of the conveying gas storage tank and the outlet of the outlet valve are further connected with a gas supplementing pipeline, the gas supplementing pipeline is provided with a gas supplementing valve, and the outlet of the gas supplementing valve is connected with an orifice plate, wherein: the gas supplementing pipeline and the outlet of the outlet valve are connected via a pipeline flexible joint.

3. The gravimetrically metered dense phase pneumatic conveying system of claim 1 wherein, The support frame comprises a square frame formed by four cross beams, the square frame is connected with two connecting beams, and the four corners of the square frame are connected with vertical legs, wherein: the two connecting beams and one of the cross beams constitute a mounting point for mounting the three weighing sensors, and the three mounting points are uniformly distributed around the center of the square frame; the conveying pump is suspended in a platform formed by the square frame and the connecting beams, a limiting door-shaped frame is fixed on the connecting beam and the corresponding cross beam for mounting the weighing sensors, and the supporting ears pass through the limiting door-shaped frame.

4. The gravimetrically metered dense phase pneumatic conveying system of claim 1 wherein, A material level meter is mounted on the top of the conveying pump, and a pressure gauge is mounted on the conveying pump.

5. The gravimetrically metered dense phase pneumatic conveying system of claim 1 wherein, The pressure relief and blowing assembly comprises a pressure relief valve mounted on the pressure relief pipeline, the inlet and the outlet of the pressure relief valve are respectively connected with a blowing pipeline and a gas supply pipeline via the blowing pipeline, and the gas supply pipeline is used to be connected with a gas supply device, wherein: a blowing valve is mounted on the blowing pipeline, the outlet of the blowing valve is connected with an orifice plate, and a gas supply valve is mounted on the gas supply pipeline.

6. The gravimetrically metered dense phase pneumatic conveying system of claim 1 wherein, The exhaust assembly comprises an exhaust valve mounted on the exhaust pipeline, and an orifice plate is mounted on the outlet of the exhaust valve.

7. The gravimetrically metered dense phase pneumatic conveying system of claim 1 wherein, The total valve is installed on the conveying control pipeline, and the outlet of the total valve is divided into three paths, one path is connected with the top of the conveying pump through the upper control pipeline, another path is connected with the middle of the conveying pump through the middle control pipeline, and the other path is connected with the bottom of the conveying pump through the lower control pipeline, wherein the upper control pipeline is installed with an upper control valve, the outlet of the upper control valve is connected with a throttle orifice plate, a check valve and the pipeline flexible joint in sequence; the middle control pipeline is installed with a middle control valve, the middle control pipeline is divided into multiple branches near the conveying pump, a throttle orifice pipe is arranged on each branch, the outlet of the throttle orifice pipe is connected with the pipeline flexible joint and the check valve in sequence, and the throttle orifice pipes are uniformly distributed along the circumferential direction of the pump body outside the conveying pump; the lower control pipeline is installed with a lower control valve, the outlet of the lower control valve is connected with a throttle orifice plate, a check valve and the pipeline flexible joint in sequence.

Images