Weighing structure of screw conveyer

Abstract

The utility model relates to the field of combustion equipment, in particular to a screw conveyor weighing structure which comprises a screw conveyor, one end of the screw conveyor serves as a supported section to be provided with a rotary supporting mechanism, and the rotary supporting mechanism supports the supported section and enables the other end of the screw conveyor to form a rotary section capable of rotating in the vertical direction. A weighing mechanism is suspended above the rotating section and is connected with a spiral conveyor; compared with the prior art, the rotary supporting mechanism is arranged at one end of the spiral conveyor and bears a part of the overall weight of the spiral conveyor, the bearing force of the weighing sensor is reduced, safety is guaranteed, and the spiral conveyor is convenient to use. Although the weighing sensor detects the overall precise weight of the spiral conveyor and the materials, the flow monitoring requirement can be basically met.

Description

Technical Field

[0001] The utility model relates to the field of combustion equipment, in particular to a weighing structure of a screw conveyor. Background Art

[0002] The calciner in thermal equipment requires reducing the carbon content of combustion, that is, reducing the usage amount of fuel: pulverized coal, and advocating the use of alternative fuels. An opening is provided on the side of the calciner to connect to a pre-combustion furnace. A stepped structure is arranged in the pre-combustion furnace. The alternative fuel descends step by step on the steps, is fully combusted, and finally enters the calciner.

[0003] The pre-combustion furnace is generally erected at a high place. Transporting fuel to the feeding system of the pre-combustion furnace often involves transporting the alternative fuel to a high position through a belt conveyor and feeding it into the pre-combustion furnace through the feeding system. The disadvantage is that a considerable part of the alternative fuel consists of garbage. Continuous transportation in an exposed environment results in a bad smell in the workplace and pollution.

[0004] The applicant has proposed CN2023229349617, a fuel conveying system for a pre-combustion furnace, in which it is proposed that the alternative fuel is sealed during transportation and the seal is broken when feeding the pre-combustion furnace, so as to reduce the exposure of the alternative fuel in the external environment and reduce pollution.

[0005] Among them, to ensure the combustion effect and monitor the combustion process, it is necessary to weigh the feeding amount. During this process, it is optimal to continuously weigh the screw conveyor, and the feeding of the screw conveyor can best reflect the overall feeding amount.

[0006] The prior art has CN2014200652227, a continuous dynamic weighing and metering screw conveyor device, which fixes the screw conveyor on two support columns, and weighing sensors are arranged between the support columns and the bottom bracket for weighing. The advantage is that it can accurately measure the overall weight. The disadvantage is that the entire weight of the screw conveyor and the material in it is all pressed on the weighing sensors, which is easily damaged after long-term use. Moreover, in this application, the screw conveyor is erected at a high altitude, and the easily damaged structure also brings more safety risks. Content of the Utility Model

[0007] To solve the above problems, the utility model provides a weighing structure of a screw conveyor.

[0008] The purpose of the utility model is achieved in the following way: a weighing structure of a screw conveyor, including a screw conveyor 4. One end of the screw conveyor 4 is set as a supported section and provided with a rotating support mechanism 41. The rotating support mechanism 41 forms a support for the supported section and enables the other end of the screw conveyor 4 to form a rotating section that can rotate in the up and down direction. A weighing mechanism 42 is suspended above the rotating section, and the weighing mechanism 42 is connected to the screw conveyor 4; the inlet and outlet of the screw conveyor 4 are respectively flexibly connected to the feeding system and the discharging system.

[0009] The rotary support mechanism 41 includes a base 411. On both sides of the base 411, there are respectively first hinge seats 412. The first hinge seats 412 are rotationally connected to second hinge seats 413 through a rotating shaft. The top of the second hinge seat 413 is fixedly connected to a bracket 414. On both sides of the bracket 414 along the rotation direction, there are respectively support plates 415. On the top of the support plates 415, there are support grooves 4151 that match the screw conveyor 4.

[0010] At the top of the rotating section of the screw conveyor 4, there is a fixed hanging ear 43. The weighing mechanism 42 includes a weighing sensor 421. The weighing end of the weighing sensor 421 is connected to the hanging ear. The other end of the weighing sensor 421 is connected to one end of a suspension member 422, and the other end of the suspension member 422 is connected to a support beam 44.

[0011] The flexible connection means a connection through a flexible connection pipe 45. The flexible connection pipe 45 includes a pipe body made of a flexible material, and both ends of the pipe body are fixedly connected with mounting plates.

[0012] The material of the pipe body is refractory fiber cloth.

[0013] Compared with the prior art, the utility model is provided with a rotary support mechanism at one end of the screw conveyor, which bears part of the overall weight of the screw conveyor, reduces the load on the weighing sensor, and ensures safety. Although the weighing sensor does not detect the overall accurate weight of the screw conveyor and the material, it can basically meet the monitoring requirements for the flow rate. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the overall kiln furnace building;

[0015] Figure 2 is a schematic structural diagram of the pre - combustion furnace and the feeding system part;

[0016] Figure 3 is an enlarged view of the feeding system part;

[0017] Figure 4 is an enlarged view of the weighing structure part of the screw conveyor;

[0018] Figure 5 is a cross - sectional view of the outlet end of the screw conveyor;

[0019] Figure 6 is a schematic structural diagram of the rotary support mechanism.

[0020] Among them, the pre - combustion furnace 1 and the feeding port 2;

[0021] the feeding section 3, the feeding pipe 31, the silo 32, the first plug valve 33;

[0022] Screw conveyor 4, rotary support mechanism 41, base 411, first hinge seat 412, second hinge seat 413, bracket 414, support plate 415, support groove 4151, weighing mechanism 42, weight sensor 421, suspension member 422, hanging ear 43, support beam 44, flexible connecting pipe 45, single flap valve 46;

[0023] Feeding section 5, storage mechanism 51, second plug valve 52. Detailed implementation manner

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] In the present invention, unless otherwise clearly defined and limited, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0026] As shown in the attached Figures 1-3 drawing, a pre-combustion furnace feeding and conveying system includes a pre-combustion furnace 1 and a feeding port 2. The pre-combustion furnace 1 and the feeding port 2 are connected through a feeding system. The feeding system includes a feeding section 3 connected to the feeding port 2. The outlet of the feeding section 3 is connected to the inlet of the screw conveyor 4. The outlet of the screw conveyor 4 is connected to the inlet of the feeding section 5. The outlet of the feeding section 5 is connected to the pre-combustion furnace 1. At least two independently controllable opening and closing storage mechanisms 51 are provided on the feeding section 5.

[0027] For the pre-combustion furnace structure, refer to CN2023229349617, a pre-combustion furnace fuel conveying system, and a crushing mechanism for breaking the seal of the ton bag is provided at the feeding port 2.

[0028] Compared with the above-mentioned prior art, the utility model further adds a blanking section 5 after the screw conveyor 4 to reduce the risk of positive pressure heat return in the pre-combustion furnace 1. At least two material storage mechanisms 51 that can be independently controlled to open and close are arranged on the blanking section 5. In actual use, only one of them can be in the open state, forming a certain degree of blockage for positive pressure heat return. Although the heat return cannot be completely blocked, it can prevent the direct current heat from flushing into the feeding system.

[0029] Furthermore, the material storage mechanism 51 is a pneumatic flap valve. The pneumatic flap valve is prior art and controls the internal flap to rotate upward to close or downward to open through an external cylinder.

[0030] Preferably, the material storage mechanism 51 is a pneumatic double flap valve. The structure can refer to the flap valve structure of CN201822264325 7 proposed by the applicant, including two flaps whose ends contact to form a V-shaped sealing plate. A rotating shaft is respectively fixed at the head ends of the two flaps, and both ends of the rotating shaft extend out of the shell and are provided with weights. The "pneumatic double flap valve" changes the control of the flap by weights in the above double flap valve to the control of a cylinder of a common pneumatic flap valve in the prior art, and utilizes the effect that the double flap valve is easier to gather and discharge materials compared with the single flap valve.

[0031] Furthermore, the blanking section 3 includes a blanking pipeline 31. The upper end of the blanking pipeline 31 is connected to the blanking port 2, the lower end of the blanking pipeline 31 is connected to the upper end of the storage bin 32, the lower end of the storage bin 32 is connected to the inlet of the screw conveyor 4, and a first plug valve 33 is arranged between the storage bin 32 and the screw conveyor 4. The storage bin 32 preferably tapers from top to bottom to form a funnel shape, and the falling fuel accumulates in the storage bin 32.

[0032] Furthermore, the blanking section 5 includes two material storage mechanisms 51 arranged successively from top to bottom. The outlet of the lower material storage mechanism 51 is connected to the inlet of the pre-combustion furnace 1, and a second plug valve 52 is arranged between the outlet of the lower material storage mechanism 51 and the inlet of the pre-combustion furnace 1.

[0033] Furthermore, as shown in the appendix Figures 4-6 A weighing structure of a screw conveyor 4 is shown. One end of the screw conveyor 4 is set as a supported section and provided with a rotating support mechanism 41. The rotating support mechanism 41 supports the supported section and enables the other end of the screw conveyor 4 to form a rotating section that can rotate in the up and down directions. The rotation axis is preferably perpendicular to the conveying direction of the screw conveyor 4. A weighing mechanism 42 is suspended above the rotating section, and the weighing mechanism 42 is connected to the screw conveyor 4. The inlet and outlet of the screw conveyor 4 are respectively flexibly connected to the feeding system and the discharging system.

[0034] By the rotating support mechanism 41 bearing part of the weight, the weighing mechanism 42 does not detect the total weight of the screw conveyor 4 and the materials therein, but reduces the burden on the weighing mechanism 42 and improves safety.

[0035] Preferably, the rotation axis of the rotary support mechanism 41 is located at the end as close as possible to the inlet of the screw conveyor 4, that is, the position as far left as possible in the figure, and preferably closer to the left end than the inlet, so as to minimize the influence of the material on the left side of the rotation axis on the measurement result.

[0036] Further, as shown in the appendix Figure 6 As shown, the rotary support mechanism 41 includes a base 411. The base 411 is preferably fixed to the bracket of the main building. First hinge seats 412 are respectively arranged on both sides of the base 411. The first hinge seats 412 are rotationally connected to the second hinge seats 413 through a rotating shaft. A bracket 414 is fixedly connected to the top of the second hinge seat 413. Support plates 415 are respectively arranged on both sides of the bracket 414 along the rotation direction. A support groove 4151 matching the screw conveyor 4 is arranged on the top of the support plate 415. The support groove 4151 abuts against or is fixed to the bottom of the screw conveyor 4. In actual use, although the two ends of the screw conveyor 4 are flexibly connected, there will not be much vibration, and there will not be much swing between the screw conveyor 4 and the rotary support mechanism 41. The design of the support plate 415 and the support groove 4151 is also beneficial to help the screw conveyor 4 resist the lateral wind at high altitude.

[0037] Further, a hanging ear 43 is fixedly arranged at the top of the rotating section of the screw conveyor 4. The weighing mechanism 42 includes a weighing sensor 421. The weighing end of the weighing sensor 421 is hung on the hanging ear. The other end of the weighing sensor 421 is connected to one end of a suspension member 422. The other end of the suspension member 422 is connected to a support beam 44. The suspension member 422 can be a cable, a tension bar or other connecting members. The connections between the suspension member 422 and the weighing sensor 421 and the support beam 44 can both be hooked or locked.

[0038] Further, the flexible connection means connecting through a flexible connection pipe 45. The flexible connection pipe 45 includes a pipe body made of a flexible material. Installation disks or flange disks are fixedly connected to both ends of the pipe body for screwing and fixing to hard components.

[0039] Preferably, the material of the pipe body is refractory fiber cloth.

[0040] Further, the outlet of the screw conveyor 4 is fixedly connected to the side of a single flap valve 46. The bottom of the single flap valve 46 forms a discharge port and is fixedly connected to the upper end of the flexible connection pipe 45. The lower end of the flexible connection pipe 45 is fixedly connected to a storage mechanism 51;

[0041] The single flap valve 46 includes a housing. A flap matching the outlet of the screw conveyor 4 is arranged in the housing. The top of the flap is fixedly connected to a rotating shaft. Both ends of the rotating shaft extend out of the housing and are fixedly connected to one end of a cantilever. A counterweight is arranged at the other end of the cantilever. A temperature sensor is arranged in the housing. When the screw conveyor 4 does not feed material through the single flap valve 46, a further isolation is formed between the screw conveyor 4 and the falling section 5.

[0042] Further, the stock storage mechanism 51, the screw conveyor 4, the first flap valve 33, and the second flap valve 52 are all electrically connected to the main controller.

[0043] The feeding method of the pre-combustion furnace feeding and conveying system includes the following steps:

[0044] S1. The fuel is transported to the feeding port 2 and falls into the silo 32 through the feeding pipeline 31.

[0045] S2. The first flap valve 33 is in the normally open state. The fuel passes through the screw conveyor 4, pushes open the flap of the single flap valve 46, and falls into the upper stock storage mechanism 51.

[0046] S3. The upper stock storage mechanism 51 is opened and maintained in the open state for x seconds for discharging; then it is closed and maintained in the closed state for y seconds for receiving materials.

[0047] S4. When the upper stock storage mechanism 51 is opened, the lower stock storage mechanism 51 is in the closed state for receiving materials and remains closed within x seconds when the upper stock storage mechanism 51 is maintained in the open state; when the upper stock storage mechanism 51 is completely closed, the lower stock storage mechanism 51 is opened for discharging and remains open within y seconds when the upper stock storage mechanism 51 is maintained in the closed state, that is, when one stock storage mechanism 51 is opened or is being opened or closed, the other must be in the completely closed state to prevent the positive pressure heat flow from flushing upwards into the entire feeding system.

[0048] S5. Repeat S4 to make the fuel fall into the pre-combustion furnace 1.

[0049] The x seconds is 5 - 10 s, and the y seconds is 5 - 10 s, and preferably they are the same.

[0050] The overheat protection method of the pre-combustion furnace feeding and conveying system is characterized in that the method includes the following steps:

[0051] S1. When the temperature sensor in the single flap valve 46 detects that the temperature is higher than the abnormal value, execute S2. Preferably, the abnormal value is 300 - 500 °C, indicating that there is or may be a fire in the blanking section 5.

[0052] S2. The first flap valve 33 executes the closing command, the screw conveyor 4 does not stop, and both stock storage mechanisms 51 are opened.

[0053] S2 is the first remedial measure, that is, when there is high temperature or fire in the blanking section 5, at this time, through the first flap valve 33, it is ensured that the fire does not spread to the silo 32 first, and the remaining materials in the screw conveyor 4 are continuously discharged into the blanking section 5 to separate the flammable substances. Since the materials are piled up in the silo 32, it is easy to cause major disasters, so it is ensured that the high temperature or fire does not spread to the silo 32 first.

[0054] 3 to 5 seconds after S3 and S2, close the two stock storage mechanisms 51 and the second flap valve 52 simultaneously, and at the same time, keep the screw conveyor 4 running;

[0055] S3 is the second remedial measure. Keeping it open for 3 to 5 seconds hopes that the fire is small and the fuel falls downward into the pre-combustion furnace. Then closing it is when the fire is not resolved. Therefore, a multi-layer partitioned space is formed to make the fuel burn in each partitioned space, control the fire in the blanking section 5, and reduce losses.

[0056] 10 to 15 seconds after S4 and S3, the remaining materials in the screw conveyor 4 are emptied, the screw conveyor 4 stops. After no materials are fed in, the flap of the single flap valve 46 falls back under the influence of the counterweight to form a partition.

[0057] The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the overall concept of the present invention, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. A screw conveyor weighing structure, comprising a screw conveyor (4), characterized in that: One end of the screw conveyor (4) is provided with a rotating support mechanism (41) as a supported section, the rotating support mechanism (41) supports the supported section and enables the other end of the screw conveyor (4) to form a rotating section that can rotate in the up and down directions, a weighing mechanism (42) is suspended above the rotating section, and the weighing mechanism (42) is connected to the screw conveyor (4); the inlet and outlet of the screw conveyor (4) are softly connected to the feeding system and the discharging system respectively.

2. A screw conveyor weighing structure as claimed in claim 1, characterized in that: The rotating support mechanism (41) comprises a base (411), first hinge seats (412) are respectively arranged on both sides of the base (411), the first hinge seat (412) is rotatably connected to a second hinge seat (413) via a rotating shaft, the top of the second hinge seat (413) is fixedly connected to a bracket (414), and support plates (415) are respectively arranged on both sides of the bracket (414) along the rotation direction, and a bracket groove (4151) matching the screw conveyor (4) is arranged on the top of the support plate (415).

3. A screw conveyor weighing structure as claimed in claim 1, characterized in that: The top of the rotating section of the screw conveyor (4) is fixed with a hanging ear (43), and the weighing mechanism (42) comprises a weighing sensor (421), the weighing end of the weighing sensor (421) is connected to the hanging ear, the other end of the weighing sensor (421) is connected to one end of a hanging member (422), and the other end of the hanging member (422) is connected to a support beam (44).

4. A screw conveyor weighing structure as claimed in claim 1, characterized in that: The soft connection refers to connection via a soft connection pipe (45), wherein the soft connection pipe (45) comprises a pipe body made of soft material, and both ends of the pipe body are fixedly connected to the mounting plate.

5. A screw conveyor weighing structure as claimed in claim 4, characterized in that: The tube body is made of refractory fiber cloth.

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