Internal pressure balancing dust removal device for mixing machine

Abstract

The utility model discloses an internal balance pressure dust removal device for a mixing machine, which comprises the mixing machine, a ventilation opening is arranged on a mixing barrel of the mixing machine, a pressure relief barrel is arranged on the ventilation opening, the pressure relief barrel is connected with a pneumatic conveyor, and the pneumatic conveyor exhausts air from the pressure relief barrel to relieve pressure in the mixing barrel; a filter element is arranged in the pressure relief cylinder and correspondingly adsorbs dust in airflow. The pressure relief cylinder is connected with a pulse airflow generator, and the pulse airflow generator can apply pulse airflow to the filter element to blow off dust adsorbed on the filter element. The filter element is a stainless steel filter element. The pressure relief cylinder is in a straight cylinder shape and is correspondingly arranged over the mixing barrel, and the lower end of the pressure relief cylinder communicates with the interior of the mixing barrel through a ventilation opening. An air hole is formed in the top of the pressure relief cylinder, and the pneumatic conveyor is connected with the pressure relief cylinder through the air hole. The air-permeable and pressure-releasing dust-absorbing device can be used for ventilating and releasing pressure, absorbing dust and preventing the dust from drifting into a production workshop.

Description

Technical Field

[0001] This utility model relates to the field of material mixing equipment, and in particular to an internal balanced pressure dust removal device for mixers. Background Technology

[0002] During mixing, the continuous rotation and agitation of powder materials in a mixer generates dust, and pressure builds up inside the drum. Excessive pressure can cause safety accidents, necessitating a pressure relief device. Therefore, mixers typically have two vents. Initially, these were covered with dust collection bags, which facilitated ventilation and pressure relief, but the bags had limited dust absorption capacity, causing dust to easily disperse over time. Later, the dust collection bags were replaced with stainless steel filter cartridges, which improved dust absorption capacity and area, but still couldn't meet the needs of production with stringent requirements. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides an internal balanced pressure dust removal device for mixers, which can both allow air to ventilate and release pressure, and can also adsorb dust, thus preventing dust from drifting into the production workshop.

[0004] Technical Solution: To achieve the above objectives, the present invention provides an internal balanced pressure dust removal device for a mixer, comprising a mixer, a mixing drum of the mixer having an air vent, a pressure relief cylinder being installed on the air vent, the pressure relief cylinder being connected to a pneumatic conveyor, the pneumatic conveyor drawing air into the pressure relief cylinder to release pressure inside the mixing drum; a filter element being installed inside the pressure relief cylinder, the filter element correspondingly adsorbing dust in the airflow; the pressure relief cylinder being cylindrical and positioned directly above the mixing drum, the lower end of the pressure relief cylinder communicating with the interior of the mixing drum through the air vent; a pulse airflow generator being connected to the upper end of the pressure relief cylinder, the pulse airflow generator applying a downward pulse airflow to the filter element, blowing the dust adsorbed on the filter element back into the mixing drum; two pressure relief cylinders being installed on the mixing drum, the bottom of the pressure relief cylinder having several inclined plates, forming an inclined airflow channel between the inclined plates, the inclined airflow channel being inclined from top to bottom in a direction away from the other pressure relief cylinder.

[0005] Furthermore, the filter element is a stainless steel filter element.

[0006] Furthermore, the top of the pressure relief cylinder is provided with an air hole, and the pneumatic conveyor is connected to the pressure relief cylinder through the air hole.

[0007] Beneficial effects: The internal balanced pressure dust removal device for mixers of this utility model has the following beneficial effects:

[0008] 1) A pressure relief cylinder is installed on the air vent of the mixer. The pneumatic conveying device draws air from the pressure relief cylinder to relieve pressure on the mixer. The pressure relief cylinder contains a stainless steel filter element that can adsorb dust.

[0009] 2) A pulse airflow generator is connected to the pressure relief cylinder. The pulse airflow generator can periodically apply pulse airflow to the filter element, continuously blowing the dust adsorbed on the filter element back into the mixing tank, preventing the filter element from being full of dust, thereby keeping the adsorption performance of the filter element in good condition.

[0010] 3) The mixing drum is equipped with two pressure relief cylinders. The bottom of the pressure relief cylinder has several inclined plates, and an inclined airflow channel is formed between adjacent inclined plates. When pulse dust removal is performed alternately in the two pressure relief cylinders, the blown dust will fall back into the mixing drum from the inclined airflow channel. Since the inclined airflow channel is inclined from top to bottom in a direction away from the other pressure relief cylinder, the blown dust is not easily sucked away by the other pressure relief cylinder, so as to reduce the load on the filter element on the other pressure relief cylinder. Attached Figure Description

[0011] Appendix Figure 1 This is a schematic diagram of the overall structure of the mixer;

[0012] Appendix Figure 2 This is a schematic diagram of the internal structure of the pressure relief cylinder. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] As attached Figures 1 to 2 The aforementioned internal balanced pressure dust removal device for the mixer includes a mixer 1, which includes a mixing drum 2 containing a stirring mechanism. When the mixer 1 is operating, powdered material is placed into the mixing drum 2, and the stirring mechanism continuously rotates and stirs the powdered material. During this process, dust is generated, and pressure is generated inside the mixing drum 2. Excessive pressure can cause safety accidents, necessitating a pressure relief device. In existing technology, the mixer 1 is equipped with two vents, and dust collection bags are placed over these vents. While this facilitates ventilation and pressure relief, the dust collection bags have limited dust adsorption capacity. Over time, dust easily disperses into the production workshop. Later, the dust collection bags were replaced with stainless steel filter elements. Although this improved dust adsorption capacity and area, meeting the production requirements in most scenarios, it still cannot meet the needs of workshops with extremely stringent environmental requirements.

[0015] Therefore, in this invention, a vent is provided on the mixing drum 2 of the mixer 1, and a pressure relief cylinder 3 is installed on the vent. The pressure relief cylinder 3 is connected to a pneumatic conveyor, which draws air from the pressure relief cylinder 3 to release pressure inside the mixing drum 2. Inside the pressure relief cylinder 3 is a filter element 4, which adsorbs dust in the airflow. Because the filter element 4 is inside the pressure relief cylinder 3, even if dust passes through the filter element 4, it will not drift into the production workshop, thus maintaining a good air environment in the production workshop.

[0016] Specifically, filter element 4 is a stainless steel filter element. Stainless steel filter elements have good adsorption capacity and a large adsorption area, which can effectively adsorb dust.

[0017] After the filter element 4 has been working for a long time, it will become covered with dust, reducing its adsorption capacity and potentially clogging it. Therefore, it is necessary to periodically clean the dust adsorbed on the filter element 4. In this invention, a pulse airflow generator 5 is connected to the pressure relief cylinder 3. The pulse airflow generator 5 applies a pulsed airflow to the filter element 4, blowing off the dust adsorbed on it. The pulse airflow generator 5 operates periodically to clean the dust off the filter element 4, thus maintaining its adsorption performance in good condition.

[0018] The pressure relief cylinder 3 is cylindrical and is positioned directly above the mixing tank 2. The lower end of the pressure relief cylinder 3 is connected to the interior of the mixing tank 2 through a vent. The top of the pressure relief cylinder 3 is provided with an air hole 6, and the pneumatic conveyor is connected to the pressure relief cylinder 3 through the air hole 6.

[0019] The pulse airflow generator 5 is connected to the upper end of the pressure relief cylinder 3. The pulse airflow generator 5 can apply a downward pulse airflow to the filter element 4. Since the pressure relief cylinder 3 is a vertical straight cylinder, the pulse airflow generator 5 can blow the dust adsorbed on the filter element 4 back into the mixing tank 2, thereby realizing the recovery of powder.

[0020] When pulse dust removal is performed in pressure relief cylinder 3, the pneumatic conveyor needs to be temporarily shut down. Furthermore, the pulsed airflow generated by the pulse generator applies positive pressure. If only a single pressure relief cylinder 3 is installed, the pressure inside mixing tank 2 will inevitably increase rapidly, creating a high positive pressure. When mixing powders, depending on the type of powder, mixing may be required under negative pressure or positive pressure. If mixing powders under negative pressure is required, the high positive pressure environment for a short period may negatively impact the mixing quality.

[0021] Therefore, at least two pressure relief cylinders 3 are installed on the mixing tank 2, and each pressure relief cylinder 3 is alternately subjected to pulse dust removal. When pulse dust removal is performed in a certain pressure relief cylinder 3, the pneumatic conveyor connected to that pressure relief cylinder 3 stops working, while the pneumatic conveyors on other pressure relief cylinders 3 work normally. In this way, the pressure rise in the mixing tank 2 will be reduced, and a high positive pressure environment will not be generated. For powders that need to be mixed under negative pressure, it helps to improve their mixing quality. For powders that need to be mixed under positive pressure, it can also prevent the generation of excessive positive pressure in the mixing tank 2, which would affect the safe operation of the mixing tank 2.

[0022] As attached Figure 1 In one embodiment shown, two pressure relief cylinders 3 are provided on the mixing tank 2, with the two pressure relief cylinders 3 located at opposite ends of the mixing tank 2. (See attached diagram) Figure 2 As shown, the bottom of the pressure relief cylinder 3 is provided with several inclined plates 7, forming an inclined airflow channel 8 between adjacent inclined plates 7. The inclined airflow channel 8 slopes downwards from the other pressure relief cylinder 3. When pulse dust removal is performed alternately in the two pressure relief cylinders 3, the blown-off dust will fall back into the mixing tank 2 through the inclined airflow channel 8. Since the inclined airflow channel 8 slopes downwards from the other pressure relief cylinder 3, the blown-off dust is not easily sucked away by the other pressure relief cylinder 3, thus reducing the load on the filter element 4 on the other pressure relief cylinder 3. The inclined plates 7 themselves are nearly vertical with a small tilt angle, so they will not obstruct the dust from falling back into the mixing tank 2.

[0023] The working principle of this invention is as follows: When the mixer 1 mixes powder, the pneumatic conveyor is normally open. Air is drawn into the mixing drum 2 through the pressure relief cylinder 3 and the vent, thereby depressurizing the mixing drum 2. Under special conditions, it may be necessary to mix the powder under positive pressure. In this case, the internal pressure of the mixing drum 2 can be adjusted by regulating the air intake of the pneumatic conveyor. During the powder mixing process, the generated dust is adsorbed onto the filter element 4 inside the pressure relief cylinder 3. After adsorption for a certain period of time, the pneumatic conveyor is temporarily shut off, and the pulse airflow generator 5 operates instantaneously, applying a pulse airflow to the stainless steel filter element to blow off the adsorbed dust, thus cleaning the filter element 4 and allowing it to continue adsorbing dust. The entire dust removal process only takes a few seconds, which is fast, convenient, and effective. After dust removal, the pulse airflow generator 5 stops working, and the pneumatic conveyor restarts, thus repeating the cycle. For mixer 1 equipped with two or more pressure relief cylinders 3, pulse dust removal can be performed synchronously or alternately as needed.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An internally balanced pressure dust removal device for a mixer, characterized in that: The mixer (1) is provided with a vent on the mixing tank (2) of the mixer (1), and a pressure relief cylinder (3) is provided on the vent. The pressure relief cylinder (3) is connected to a pneumatic conveyor. The pneumatic conveyor draws air from the pressure relief cylinder (3) to relieve pressure in the mixing tank (2). The pressure relief cylinder (3) contains a filter element (4), which adsorbs dust in the airflow. The pressure relief cylinder (3) is cylindrical and is positioned directly above the mixing tank (2). The lower end of the pressure relief cylinder (3) is connected to the interior of the mixing tank (2) through a vent. The upper end of the pressure relief cylinder (3) is connected to a pulse airflow generator (5). The pulse airflow generator (5) can apply a downward pulse airflow to the filter element (4) to blow the dust adsorbed on the filter element (4) back into the mixing tank (2). The mixing tank (2) is provided with two pressure relief cylinders (3). The bottom of the pressure relief cylinder (3) has several inclined plates (7). An inclined airflow channel (8) is formed between the inclined plates (7). The inclined airflow channel (8) is inclined from top to bottom in a direction away from the other pressure relief cylinder (3).

2. The internal balanced pressure dust removal device for a mixer according to claim 1, characterized in that: The filter element (4) is a stainless steel filter element.

3. The internal balanced pressure dust removal device for a mixer according to claim 1, characterized in that: The pressure relief cylinder (3) is provided with an air hole (6) at the top, and the pneumatic conveyor is connected to the pressure relief cylinder (3) through the air hole (6).

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