Negative pressure dust collecting cover for discharge outlet of mortar packing machine

Abstract

The utility model belongs to the technical field of negative pressure dust collecting cover, concretely relates to a negative pressure dust collecting cover for mortar packing machine discharge gate, including the fixed ring of fixed connection in the outside of discharge gate, the bottom of fixed ring is equipped with the dust collecting cover through bolt mounting, the dust collecting cover is connected in the outside of discharge gate with sliding, the outside lower part of discharge gate is equipped with the ring pipe, the bottom of ring pipe is connected with a plurality of air inlets, through the combination of flexible curtain and negative pressure dust collection system, effectively improve the dust capture efficiency of the discharge gate of dry-mixed mortar packing machine, wherein, the rectangular dust collecting cover and the flexible curtain installed on the bottom of the dust collecting cover around the discharge gate can adaptively fit different specifications of packaging bags, forming an effective semi-closed negative pressure space at the filling station, this structure can not only maximize limit and accommodate the transverse escape of dust, but also facilitate the operator to easily push away the curtain for taking and placing the bag.

Description

Technical Field

[0001] This solution belongs to the field of negative pressure dust collection hoods, specifically involving a negative pressure dust collection hood for the discharge port of a mortar packaging machine. Background Technology

[0002] In modern factories, powder or granular materials such as mortar, tile adhesive, and putty powder are usually bagged using automatic packaging machines.

[0003] A search revealed a utility model patent with authorization announcement number CN210618511U, which discloses a mortar packaging machine. The machine includes a frame with a feeding mechanism on the frame. The feeding mechanism includes a hopper and a discharging mechanism. The discharging mechanism includes a feeding component inside the discharging mechanism. The inlet end of the discharging mechanism abuts against the bottom outlet of the hopper. The feeding component includes a rotating shaft and several feeding blades. The rotating shaft is connected to a transmission wheel shaft. A guide groove is vertically provided on the frame, and a floating wheel is slidably fitted on the guide groove. An elastic element is also provided in the guide groove to support the floating wheel.

[0004] Based on the aforementioned patent searches and in conjunction with existing mortar packaging machines, it was found that during the packaging process, material is rapidly poured into waiting packaging bags through the machine's outlet. At this time, the air inside the packaging bag is quickly replaced and compressed, forming an upward airflow. This airflow carries a large amount of fine dust particles that violently escape from the gap between the bag opening and the outlet, permeating the working environment. This unorganized dust emission brings a series of serious problems: First, it severely pollutes the working environment, damages the respiratory health of operators, and long-term inhalation may lead to occupational diseases such as pneumoconiosis; second, the loss of valuable materials causes direct economic losses. To address this issue, existing technologies often install dust collection hoods near the discharge port and connect them to exhaust equipment. However, when the existing dust collection system stops operating, the negative pressure in the pipes disappears. Dust that has been captured but has not yet completely fallen into the dust bag may fall back along the suction pipe under gravity and escape from the suction port of the dust collection hood, causing secondary pollution. In addition, since the dust generation point is located at the lower bag opening, the top suction hood is far from the dust source, requiring a very large air volume to effectively control the wind speed. This results in high energy consumption, low collection efficiency, and susceptibility to interference from lateral airflow. Utility Model Content

[0005] The purpose of this solution is to provide a negative pressure dust collection hood for the discharge port of a mortar packaging machine to solve the problems of dust backflow and low dust collection efficiency in existing technologies.

[0006] To achieve the above objectives, this solution provides a negative pressure dust collection hood for the discharge port of a mortar packaging machine, including a fixing ring fixedly connected to the outside of the discharge port. The bottom of the fixing ring is bolted to a dust collection hood, which is slidably connected to the outside of the discharge port. A ring tube is sleeved on the lower outer side of the discharge port. Multiple air inlets are connected to the bottom of the ring tube. Each air inlet is equipped with an anti-backflow component. A machine base is welded to the upper right side of the dust collection hood. An air pump is fixedly installed on the upper end of the machine base. A connecting pipe is fixedly connected to the input end of the air pump. The connecting pipe is L-shaped, penetrates the dust collection hood, and extends to the inside of the dust collection hood. The end of the connecting pipe is connected to the ring tube.

[0007] The principle of this solution is as follows: During use, the operator places an empty packaging bag below the discharge port, opens the curtain, and places the bag opening over the discharge port. Then, the mortar packaging machine and the vacuum pump are started. The packaging machine begins to fill the bag with mortar. At this time, the air inside the bag is quickly replaced by the material, carrying dust upwards. After the vacuum pump starts working, it evacuates the ring pipe through the connecting pipe, creating a stable negative pressure inside the ring pipe. This negative pressure is transmitted to each air inlet and acts on the plugs of the anti-backflow component. Under the action of the pressure difference, the plugs overcome the spring force and slide upwards along the axis of the slide rod, thereby opening the narrow channel of the cone tube. At this time, a dust collection hood is formed between the bottom area of ​​the curtain and the ring pipe. The rising airflow precisely captures the escaping dust, which is then drawn in through the open air inlet along with the air. The dust travels through the ring pipe and connecting pipe, eventually being transported to the dust collection bag at the output of the suction pump or to the subsequent dust removal system. Once filling is complete, the packaging machine stops. Shortly after, the suction pump is turned off. At this point, the negative pressure in the ring pipe disappears, the spring in the anti-backflow assembly resets, and it drives the sliding rod and its fixed plug downwards, tightly inserting them into the narrow opening of the cone pipe to form an effective seal. This action completely closes the air intake channel, preventing dust that may fall back into the dust collection bag or pipe due to inertia or gravity from escaping back into the working environment through the air inlet, thus avoiding secondary pollution.

[0008] The technical advantages of this solution are as follows: by combining the flexible curtain with the negative pressure dust collection system, the dust capture efficiency at the discharge port of the dry mortar packaging machine is effectively improved. The rectangular dust collection hood surrounding the discharge port and the flexible curtain installed at its bottom can adaptively fit packaging bags of different sizes, forming an effective semi-enclosed negative pressure space at the filling station. This structure can not only limit and accommodate the lateral dispersion of dust to the maximum extent, but also make it easy for operators to open the curtain to pick up and put down bags. At the same time, the ring pipe located below the discharge port and the opening below the curtain work together to form a directional airflow at the source of dust generation, ensuring that dust is efficiently sucked into the dust collection system.

[0009] By installing a mechanical anti-backflow component in each air inlet of the ring pipe, the reliability and safety of the system are improved to a certain extent. The anti-backflow component uses a simple structure of spring, slide bar, plug and cone tube to realize the function of a one-way valve: when the air pump starts, a negative pressure is generated in the ring pipe, and the plug moves upward against the spring force under the action of pressure difference, opening the channel to draw in dusty air; when the air pump stops working, the negative pressure disappears, the spring drives the plug to quickly reset, blocking the cone tube, thereby effectively preventing the collected dust from overflowing back into the working area from the suction port due to backflow of airflow, avoiding secondary pollution.

[0010] Furthermore, the dust collection hood is a rectangular shell shape, and multiple curtains are bolted to each of its four sides, with adjacent curtains contacting each other. The curtains can fit well with packaging bags of different heights and shapes, forming a semi-enclosed space to effectively prevent dust from spilling out. At the same time, workers can easily open the curtains to pick up and put down bags, with smooth movements and no impact on work efficiency.

[0011] Furthermore, multiple fixing brackets are welded to the outer wall of the annular tube. The fixing brackets are L-shaped, and their vertical parts are fixedly connected to the bottom of the dust collection hood. The number of fixing brackets corresponds to the four sides of the dust collection hood, and they are fixed to the bottom of the four sides of the dust collection hood, which helps to fix the annular tube, allowing it to hang in the bottom area of ​​the discharge port.

[0012] Furthermore, a dust collection bag is installed at the output end of the vacuum pump via a clamp. The output end of the vacuum pump can be fitted with a dust collection bag, and can also be connected to a storage silo via pipeline or a screw conveyor for reuse in the production line, thus achieving material recycling.

[0013] Furthermore, the anti-backflow assembly includes a conical tube fixedly connected to the inner wall of the air inlet, with the narrow opening of the conical tube facing upwards. Two symmetrically arranged fixing rods are fixedly connected to the lower inner side of the conical tube. A circular block is fixedly connected to the ends of the two fixing rods. A sliding sleeve is fixedly connected to the upper end of the circular block. A sliding rod is slidably connected inside the sliding sleeve. A plug is fixedly connected to the top of the sliding rod. The plug is slidably connected to the inner side of the narrow opening of the conical tube. The plug is bottle-stop shaped, and its protrusion is located at the top of the conical tube. When air is drawn into the annular tube by the suction pump and is under negative pressure, the plug will rise, allowing air to enter the annular tube through the air inlet. After the suction pump is turned off, the plug will automatically reset, thereby sealing the conical tube and preventing backflow and dust overflow.

[0014] Furthermore, a spring is fixedly connected to the bottom inner side of the sliding sleeve, and the top of the spring is fixedly connected to the bottom of the sliding rod. The reaction force of the spring can act on the plug through the sliding rod, which has an auxiliary repositioning effect on the plug.

[0015] Furthermore, a flange is fixedly connected to the upper outer side of the sliding sleeve, and a protective sleeve is fixedly connected to the upper end of the flange. The top of the protective sleeve is fixedly connected to the bottom edge of the plug. The protective sleeve can be made of corrugated tubing, which is flexible and also provides dust protection for the spring inside the sliding sleeve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 2 ; Figure 3 This is an embodiment of the present utility model. Figure 1 A front sectional view; Figure 4 This is an embodiment of the present utility model. Figure 3 Enlarged view of point A; Figure 5 This is an embodiment of the present utility model. Figure 1 A partial structural diagram.

[0017] The following detailed explanation illustrates the specific implementation methods: The reference numerals in the accompanying drawings of the instruction manual include: 1. discharge port; 2. fixing ring; 3. dust collection hood; 4. curtain; 5. ring pipe; 51. fixing frame; 6. air inlet; 7. anti-backflow assembly; 8. machine base; 9. air pump; 10. connecting pipe; 11. dust collection bag; 71. cone pipe; 72. fixing rod; 73. round block; 74. sliding sleeve; 75. sliding rod; 76. plug; 77. spring; 78. flange; 79. protective sleeve. Detailed Implementation

[0018] The basic implementation examples are as follows: Figure 1 , Figure 2 , Figure 3 , Figure 5As shown: A negative pressure dust collection hood for the discharge port of a mortar packaging machine includes a fixing ring 2 fixedly connected to the outside of the discharge port 1. A dust collection hood 3 is bolted to the bottom of the fixing ring 2. The dust collection hood 3 is slidably connected to the outside of the discharge port 1. The dust collection hood 3 is rectangular shell-shaped, and multiple curtains 4 are bolted to all four sides of the dust collection hood 3. Adjacent curtains 4 are in contact with each other. The curtains 4 can fit well with packaging bags of different heights and shapes, forming a semi-enclosed space to effectively prevent dust from overflowing. At the same time, workers can easily open the curtains 4 to pick up and put down bags, with smooth movements and no impact on work efficiency. A ring tube 5 is fitted on the lower outer side of the discharge port 1. Multiple fixing brackets 51 are welded to the outer wall of the ring tube 5. The fixing brackets 51 are L-shaped, and the vertical parts of the fixing brackets 51 are fixedly connected to the bottom of the dust collection hood 3. The number of fixing brackets 51 corresponds to the four sides of the dust collection hood 3, and they are fixed to the bottom of the four sides of the dust collection hood 3. They serve to fix the ring pipe 5, allowing the ring pipe 5 to hang in the bottom area of ​​the discharge port 1. A base 8 is welded to the upper right side of the dust collection hood 3. An air pump 9 is fixedly installed on the upper end of the base 8. A connecting pipe 10 is fixedly connected to the input end of the air pump 9. The connecting pipe 10 is L-shaped and passes through the dust collection hood 3, extending to the inside of the dust collection hood 3. The end of the connecting pipe 10 is connected to the ring pipe 5. A dust collection bag 11 is installed at the output end of the air pump 9 through a clamp. The output end of the air pump 9 can be equipped with a dust collection bag 11, and can also be connected to a storage silo or a screw conveyor through a pipeline for reuse in the production line, realizing material recycling.

[0019] like Figure 4 , Figure 5As shown, the bottom of the annular pipe 5 is connected to multiple air inlets 6. Each air inlet 6 has an anti-backflow assembly 7 inside. The anti-backflow assembly 7 includes a conical pipe 71 fixedly connected to the inner wall of the air inlet 6, with the narrow opening of the conical pipe 71 facing upwards. Two symmetrically arranged fixing rods 72 are fixedly connected to the lower inner side of the conical pipe 71. The ends of the two fixing rods 72 are jointly fixedly connected to a circular block 73. A sliding sleeve 74 is fixedly connected to the upper end of the circular block 73. A sliding rod 75 is slidably connected inside the sliding sleeve 74. A plug 76 is fixedly connected to the top of the sliding rod 75. The plug 76 is slidably connected to the inner side of the narrow opening of the conical pipe 71. The plug 76 is bottle-shaped, and its protrusion is located at the top of the conical pipe 71. A spring 77 is fixedly connected to the bottom inner side of the sliding sleeve 74. The top of the spring 77 is fixedly connected to the bottom of the sliding rod 75. The reaction force of the spring 77 can act on the plug 76 through the sliding rod 75, which has an auxiliary repositioning function for the plug 76. A flange 78 is fixedly connected to the upper outer side of the sliding sleeve 74, and a protective sleeve 79 is fixedly connected to the upper end of the flange 78. The top of the protective sleeve 79 is fixedly connected to the bottom edge of the plug 76. The protective sleeve 79 can be made of corrugated tubing, which is flexible and can also protect the spring 77 inside the sliding sleeve 74 from dust. When the air pump 9 draws air into the annular pipe 5 and creates a negative pressure state, the plug 76 will be pushed up, and air will enter the annular pipe 5 through the air inlet 6. After the air pump 9 is turned off, the plug 76 will automatically reset, thereby sealing the cone pipe 71 and preventing backflow of dust.

[0020] The specific implementation process of this utility model is as follows: During use, the operator places an empty packaging bag below the discharge port 1, opens the curtain 4, and places the bag opening over the discharge port 1. Then, the mortar packaging machine and the vacuum pump 9 are started. The packaging machine begins to fill the bag with mortar. At this time, the air inside the bag is quickly replaced by the material, carrying dust upwards. After the vacuum pump 9 starts working, it draws air from the ring pipe 5 through the connecting pipe 10, creating a stable negative pressure inside the ring pipe 5. This negative pressure is transmitted to each air inlet 6 and acts on the plug 76 of the anti-backflow component 7. Under the pressure difference, the plug 76 overcomes the elastic force of the spring 77 and slides upwards along the axis of the slide rod 75, thereby opening the narrow passage of the cone pipe 71. At this time, the dust collection hood 3, the bottom area of ​​the curtain 4, and the ring pipe 5... An upward airflow is formed, which precisely captures the escaping dust. The dust is drawn in along with the air through the open air inlet 6, passes through the ring pipe 5 and the connecting pipe 10, and is finally transported to the dust collection bag 11 at the output end of the vacuum pump 9 or to the subsequent dust removal system. After filling is completed, the packaging machine stops. A little later, the vacuum pump 9 is turned off. At this time, the negative pressure in the ring pipe 5 disappears, the spring 77 in the anti-backflow component 7 returns to its original position, and drives the slide rod 75 and the plug 76 fixed thereto to move downward, so that it tightly plugs into the narrow opening of the cone pipe 71, forming an effective seal. This action completely closes the air intake channel, which can prevent dust that may fall back in the dust collection bag 11 or pipe due to inertia or gravity from escaping back into the working environment through the air inlet 6, thus avoiding secondary pollution.

[0021] This solution effectively improves the dust capture efficiency at the discharge port 1 of the dry mortar packaging machine by combining the flexible curtain 4 with the negative pressure dust collection system. The rectangular dust collection hood 3 surrounding the discharge port 1 and the flexible curtain 4 installed at its bottom can adaptively fit packaging bags of different sizes, forming an effective semi-enclosed negative pressure space at the filling station. This structure can not only limit and accommodate the lateral dispersion of dust to the maximum extent, but also make it easy for operators to open the curtain 4 to pick up and put down bags. At the same time, the ring pipe 5 located below the discharge port 1 and the opening below the curtain 4 work together to form a directional airflow at the source of dust generation, ensuring that dust is efficiently sucked into the dust collection system.

[0022] By installing a mechanical anti-backflow component 7 in each air inlet 6 of the ring pipe 5, the reliability and safety of the system are improved to a certain extent. The anti-backflow component 7 uses a simple structure of spring 77, slide rod 75, plug 76 and cone tube 71 to realize the function of a one-way valve: when the air pump 9 starts, a negative pressure is generated in the ring pipe 5, and the plug 76 moves upward against the force of spring 77 under the action of pressure difference, opening the channel to draw in dusty air; when the air pump 9 stops working, the negative pressure disappears, and spring 77 drives the plug 76 to quickly reset, blocking the cone tube 71, thereby effectively preventing the collected dust from overflowing back into the working area due to backflow of airflow, avoiding secondary pollution.

[0023] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A negative pressure dust collection hood for the discharge port of a mortar packaging machine, comprising a fixing ring fixedly connected to the outside of the discharge port, characterized in that: A dust collection hood is bolted to the bottom of the fixed ring. The dust collection hood is slidably connected to the outside of the discharge port. A ring tube is sleeved on the lower outer side of the discharge port. Multiple air inlets are connected to the bottom of the ring tube. Each air inlet is equipped with an anti-backflow component. A base is welded to the upper right side of the dust collection hood. An air pump is fixedly installed on the upper end of the base. A connecting pipe is fixedly connected to the input end of the air pump. The connecting pipe is L-shaped and passes through the dust collection hood and extends to the inside of the dust collection hood. The end of the connecting pipe is connected to the ring tube.

2. The negative pressure dust collection hood for the discharge port of a mortar packaging machine according to claim 1, characterized in that: The dust collection hood is rectangular and shell-shaped. Multiple curtains are bolted to all four sides of the dust collection hood, and adjacent curtains are in contact with each other.

3. The negative pressure dust collection hood for the discharge port of a mortar packaging machine according to claim 1, characterized in that: The outer ring wall of the ring tube is welded with multiple fixing brackets, the fixing brackets are L-shaped, and the vertical part of the fixing brackets is fixedly connected to the bottom of the dust collection hood.

4. The negative pressure dust collection hood for the discharge port of a mortar packaging machine according to claim 1, characterized in that: The output end of the air pump is fitted with a dust collection bag via a clamp.

5. A negative pressure dust collection hood for the discharge port of a mortar packaging machine according to claim 1, characterized in that: The anti-backflow assembly includes a conical tube fixedly connected to the inner wall of the air inlet, with the narrow opening of the conical tube facing upwards. Two symmetrically arranged fixing rods are fixedly connected to the lower inner side of the conical tube. A circular block is fixedly connected to the ends of the two fixing rods. A sliding sleeve is fixedly connected to the upper end of the circular block. A sliding rod is slidably connected inside the sliding sleeve. A plug is fixedly connected to the top of the sliding rod. The plug is slidably connected to the inner side of the narrow opening of the conical tube. The plug is bottle-shaped, and its protrusion is located at the top of the conical tube.

6. A negative pressure dust collection hood for the discharge port of a mortar packaging machine according to claim 5, characterized in that: A spring is fixedly connected to the bottom inner side of the sliding sleeve, and the top of the spring is fixedly connected to the bottom of the sliding rod.

7. A negative pressure dust collection hood for the discharge port of a mortar packaging machine according to claim 5, characterized in that: A flange is fixedly connected to the upper outer side of the sliding sleeve, and a protective sleeve is fixedly connected to the upper end of the flange. The top of the protective sleeve is fixedly connected to the bottom edge of the plug.

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