Air cannon anti-blocking device based on PLC control

Abstract

An air cannon anti-blocking device based on PLC control comprises a hopper (1) and is characterized in that multiple layers of compressed air pipes (2) are annularly arranged on the outer wall of the hopper (1), each layer of compressed air pipe (2) is connected with at least two air cannon bodies (3), and the air cannon bodies (3) are installed on the outer wall of the hopper (1). An air inlet hole matched with an air outlet of the air cannon (3) is formed in the hopper wall of the hopper (1), and the air cannon (3) is further connected with a PLC. The hopper has the advantages of being capable of effectively solving the problem that the hopper (1) is blocked in the transportation process of powder or granular materials, small in vibration, small in fault, safe, convenient, economical and reliable, greatly improving operation stability, reducing later maintenance workload and being higher in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of material unloading, in particular to an air cannon anti-blocking device based on PLC control. Background Art

[0002] In the current transmission of many powder or granular materials, most of them use belt conveyors. There are many large hoppers in the buffering process of transfer. Powder or granular materials in the hopper are easily accumulated and blocked in the hopper due to moisture or the powder material itself. In order to continue to transport the materials, most of the hoppers are equipped with electric vibration motors to make the materials in the hopper fall through the vibration of the motor. However, this vibration method has great defects. First, the vibration motor is bulky and extremely inconvenient to install on the hopper wall; second, due to vibration, the motor failure rate is greatly increased; third, when the motor vibrates, it causes the hopper to vibrate violently, the vibration sound is loud, and the machinery is worn; especially when the hopper is large, the number of vibration motors also increases accordingly, and the failure rate and maintenance workload are greatly increased.

[0003] Moreover, in the original vibration motor method, there is no sequential control for the start and stop of the motor. Once started, all motors start, and once stopped, all motors stop. In terms of energy saving and loss, it is a complete energy-consuming device.

[0004] Disadvantages of the existing technology: The commonly used hopper anti-blocking devices are often inconvenient to install and prone to malfunction; when working, they are prone to cause large vibration of the hopper, loud vibration sound, mechanical wear and other problems. Utility Model Content

[0005] The utility model provides an air cannon anti-blocking device based on PLC control, which not only has small vibration and small faults, but also greatly improves the operation stability and reduces the workload of later maintenance.

[0006] To achieve the above-mentioned purpose, the utility model provides an air cannon anti-blocking device based on PLC control, including a hopper, and the key point is: a plurality of layers of compressed air pipes are arranged in a ring on the outer wall of the hopper, each layer of the compressed air pipes is connected to at least two air cannons, the air cannon is installed on the outer wall of the hopper, an air inlet hole matching the air outlet of the air cannon is opened on the hopper wall, and the air cannon is also connected to the PLC controller.

[0007] Through the above design, air cannons are used to replace vibration motors, and the number of air cannons to be installed is set according to the size of the hopper. The PLC program is used to control the time intervals to control the working time of each air cannon. This design not only has low vibration, low failure, safety, convenience, economy and reliability, but also greatly improves the operating stability and reduces the workload of later maintenance.

[0008] As a preference, the air cannons of two adjacent layers are arranged at staggered positions and are not on the same straight line in the vertical direction.

[0009] When the air cannon impacts, the range of materials loosened by the air cannon is the area of ​​a circle centered on the air cannon, so adjacent air cannons should be set at staggered positions to avoid repeated impacts on the same material area, which would waste resources.

[0010] Preferably, each air cannon's air outlet is provided with a solenoid valve.

[0011] Preferably, the PLC controller controls the opening time and closing time of the solenoid valve.

[0012] Through the above design, the PLC controller controls the opening and closing time of each solenoid valve, and then controls the release time of the compressed air in the corresponding air cannon, which is convenient for orderly management of the working time of each air cannon. During the control process of the PLC controller, adjacent air cannons must not be opened at the same time to avoid waste of resources; and the number of air cannons opened at the same time should not be too large, otherwise the air pressure in the compressed air pipe will not be supplied in time, and the pressure impact force will be too small to play the role of loosening materials.

[0013] Preferably, a material-incoming belt conveyor is provided at the feeding end of the hopper, and a material-discharging belt conveyor is provided at the discharging end of the hopper.

[0014] The incoming material conveyor and the outgoing material conveyor are used for conveying materials.

[0015] Preferably, the air inlet of the compressed air pipe is connected to a compressed air source.

[0016] Using compressed air as the power source of the air cannon is safe, environmentally friendly, low-cost and highly practical.

[0017] The beneficial effects of the utility model are as follows: it can effectively solve the problem of hopper blockage during the transportation of powder or granular materials. It not only has small vibration, few faults, is safe and convenient, economical and reliable, but also greatly improves the operating stability, reduces the workload of later maintenance, and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model in Example 1;

[0019] Figure 2 It is a structural schematic diagram in Example 2;

[0020] Figure 3 Schematic diagram of the PLC control program in Example 2. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific examples. The following embodiments or drawings are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0022] Embodiment 1:

[0023] like Figure 1 As shown: an air cannon anti-blocking device based on PLC control, including a hopper 1, the key of which is: a plurality of layers of compressed air pipes 2 are arranged in an annular manner on the outer wall of the hopper 1, each layer of the compressed air pipes 2 is connected to at least two air cannons 3, the air cannon 3 is installed on the outer wall of the hopper 1, an air inlet hole matching the air outlet of the air cannon 3 is opened on the hopper wall of the hopper 1, and the air cannon 3 is also connected to the PLC controller.

[0024] The air outlet of each air cannon 3 is provided with a solenoid valve, and the PLC controller controls the opening time and closing time of the solenoid valve.

[0025] The air cannons 3 of two adjacent layers are arranged at staggered positions and are not on the same straight line in the vertical direction.

[0026] The feeding end of the hopper 1 is provided with an incoming conveyor belt 4 , and the discharging end of the hopper 1 is provided with a discharging conveyor belt 5 .

[0027] The air inlet of the compressed air pipe 2 is connected to a compressed air source.

[0028] Embodiment 2:

[0029] Example 2 is based on Example 1, as Figure 2 As shown: according to the properties of the material, such as whether the material is granular or powdery, whether the material is easy to flow downward, and the size of the hopper, the air cannon is reasonably installed; the material in Example 2 is mineral powder, and an air cannon is installed every 60 cm on the outer wall of the hopper, and the distance between two adjacent layers of air cannons is also 60 cm. Because the hopper is generally conical, the upper and lower air cannons are installed at staggered positions and are not in the same straight line in the vertical direction. Because when the air cannon impacts, it loosely forms the area of ​​a circle centered on itself.

[0030] Count the number of air cannons and group them according to actual conditions. Open and close them in groups during control. Air cannons in the same group should not be in the same straight line or too close to each other to avoid waste of resources. Also, do not open too many air cannons at the same time. Otherwise, the air pressure in the compressed air ring pipe will not be supplied in time and the pressure impact force will be too small to loosen the materials.

[0031] Figure 2In the programming of the PLC controller, the air cannons are divided into four groups: V1, V2, V3, and V4, with six air cannons in each group. In the programming of the PLC controller, the air cannons are set to open and close in sequence according to the number of groups. The six air cannons in each group are also opened and closed one by one in sequence. If the hopper is large and a large number of air cannons are installed, at least two air cannons can be opened and closed at the same time, but not too many to avoid insufficient air pressure supply.

[0032] Each solenoid valve opens and closes in sequence at 5-second intervals, and each solenoid valve is only open for 2 seconds, so the time taken for the V1 group to open and close is 30 seconds, and then the V2 group, V3 group, and V4 group are executed in sequence, and one cycle takes 2 minutes (the number of minutes of a cycle depends on the number of air guns). After V4 is completed, the next cycle begins, from V1 group to V4 group, and the cycle continues.

[0033] In Example 2, the air cannons are divided into 4 groups, each group is a network in the PLC program design, that is, a total of 4 networks. Figure 3 The following is a partial program diagram of the PLC controller. There are 4 groups of air cannons, each with 6 air cannons, for a total of 24 air cannons. Then add an expansion module to the PLC. The 24 air cannons require the 24 points of the PLC output Q0.0~Q0.7, Q1.0~Q1.7, Q2.0~Q2.7, that is, the last point is Q2.7, that is, when Q2.7 is executed, it is a cycle, and all previous program points must be reset at this time, that is, the reset logic R is used, starting from T37, a total of 4 networks (in fact, the reset logic R of the PLC is calculated based on the logic point, so after the program is calculated, the number of points is counted, and the parameters of R are set) are reset. After the reset, all are cleared, but SM0.0 is still in the power-on state, and it is started to execute a new round of commands.

[0034] After power on, the first air cannon is timed by the T37 clock for 5 seconds, that is, after 5000ms, the Q0.0 internal relay is energized to open the first air cannon solenoid valve of the first group, and then the T37 clock is timed for 2 seconds, Q0.0 is powered off, and the air cannon solenoid valve is closed. Similarly, the second air cannon is opened based on the previous timer. The program design here is very simple and repeated, but the corresponding air cannon solenoid valves are different.

[0035] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An air cannon anti-blocking device based on PLC control, comprising a hopper (1), Features: A plurality of compressed air pipes (2) are arranged in an annular manner on the outer wall of the hopper (1), each layer of the compressed air pipes (2) is connected to at least two air cannons (3), the air cannons (3) are installed on the outer wall of the hopper (1), an air inlet hole matching the air outlet of the air cannon (3) is opened on the wall of the hopper (1), and the air cannon (3) is also connected to a PLC controller.

2. According to the PLC-controlled air cannon anti-blocking device of claim 1, Features: The air cannons (3) on two adjacent layers are arranged at staggered positions and are not on the same straight line in the vertical direction.

3. According to the PLC-controlled air cannon anti-blocking device of claim 1, Features: The air outlet of each air cannon (3) is provided with a solenoid valve.

4. According to the PLC-controlled air cannon anti-blocking device of claim 3, Features: The PLC controller controls the opening time and closing time of the solenoid valve.

5. According to the PLC-controlled air cannon anti-blocking device of claim 1, Features: The feeding end of the hopper (1) is provided with an incoming conveyor belt (4), and the discharging end of the hopper (1) is provided with a discharging conveyor belt (5).

6. According to the PLC-controlled air cannon anti-blocking device of claim 1, Features: The air inlet of the compressed air pipe (2) is connected to a compressed air source.

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