Dry powder recycling system for fire extinguisher filling production line

Abstract

The present invention discloses a dry powder recycling system for a fire extinguisher filling production line, including a dry powder filling pipe, a branch pipe connected to a dry powder filling port of a vacuum filling head is arranged on the dry powder filling pipe, the vacuum exhaust hole of the vacuum filling head is connected to a dust collector through a pipeline, the dust collector is connected to a dry powder recovery tank through a feed pipe with a first valve, and the dry powder recovery tank is connected to the dry powder filling pipe through a return pipe with a second valve. The present invention has a simple structure and significant effect. It can not only recover the light components lost due to the negative pressure during the initial filling process, but also reuse them in the initial filling and refilling processes, effectively improving the dry powder filling qualified rate, reducing the raw material consumption, and reducing the difficulty of operation.

Description

Technical Field

[0001] The invention relates to the technical field of fire extinguisher filling, in particular to a dry powder recycling system used in a fire extinguisher filling production line. Background Art

[0002] Chinese patent 201820868809.X discloses a filling head for a filling and inflating device of a dry powder fire extinguisher (see Figure 1 ), during automated production, the above-mentioned vacuum negative pressure filling head is first used for initial dry powder filling (hereinafter referred to as "initial filling"), and then the tank is weighed for weight verification. If necessary, the fire extinguisher is refilled through fine filling equipment (including fine filling tanks and fine filling code trays, etc.). Since the filled dry powder is a mixture of various solid powders, under the negative pressure during the initial filling, the light components will be sucked away along with the air, causing an imbalance in the dry powder components in the fire extinguisher, and even not meeting national standards, affecting product quality; secondly, in order to make the filling meet the requirements, the content of light dry powder is often increased based on experience, which increases the difficulty of operation and causes waste of raw materials; thirdly, the sucked dry powder enters the vacuum system, which is easy to cause equipment damage. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a dry powder recycling system for a fire extinguisher filling production line, which can specifically adopt the following technical solutions:

[0004] The dry powder recycling system for a fire extinguisher filling production line described in the present invention comprises a dry powder filling pipe, on which a branch pipe connected to a dry powder filling port of a vacuum filling head is provided, the vacuum exhaust hole of the vacuum filling head is connected to a dust collector through a pipeline, the dust collector is connected to a dry powder recovery tank through a feed pipe with a first valve, and the dry powder recovery tank is connected to the dry powder filling pipe through a return pipe with a second valve.

[0005] The dry powder recovery tank and the dry powder filling pipe are respectively provided with a first feed pipe and a second feed pipe connected to the fine filling tank. The fine filling tank is connected to the fine filling tank through a feed pipe. The first feed pipe, the second feed pipe and the feed pipe are respectively provided with a third valve, a fourth valve and a fifth valve.

[0006] The dry powder filling pipe, dry powder recovery tank and dust collector are arranged in sequence from bottom to top, and the fine filling tank is located above the fine filling tank; the fine filling tank and the dust collector shell are both provided with a vacuum valve and a pressure relief valve; a dust removal bag is provided in the dust collector shell, and the feed pipe at the bottom of the dust collector is connected to the top of the dry powder recovery tank; the return pipe connected to the dry powder filling pipe is provided in the middle of the dry powder recovery tank, and the first feed pipe connected to the fine filling tank is provided at the bottom of the dry powder recovery tank.

[0007] The bottom plate of the dry powder recovery tank is tilted, and the first feeding pipe is close to the lower end of the dry powder recovery tank.

[0008] The first valve, the second valve, the third valve, the fourth valve and the fifth valve are all pinch valves.

[0009] Position sensors are arranged at the bottom of the dust collector, the top of the dry powder recovery tank, and the top and bottom of the fine filling tank.

[0010] The dry powder filling tube is provided with a filter screen and an inspection window.

[0011] The dry powder recycling system for a fire extinguisher filling production line provided by the present invention has a simple structure and significant effect. It can not only recover the light components lost due to negative pressure during the initial filling process, but also reuse them in the initial filling and refilling processes, thereby effectively improving the dry powder filling qualification rate, reducing raw material consumption, and alleviating the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an existing vacuum negative pressure filling head.

[0013] Figure 2 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0014] like Figure 2 As shown, the dry powder recycling system for the fire extinguisher filling production line of the present invention includes a dry powder filling pipe 1, on which a branch pipe 2 connected to the dry powder filling port of the vacuum filling head is provided, and the vacuum exhaust hole of the vacuum filling head is connected to the dust collector 3 through a pipeline. The dust collector 3 generally adopts a bag-type dust collector, that is, it includes a shell and a bag 3.1 located in the shell. Usually, a first vacuum valve 3.2 and a first pressure relief valve 3.3 are provided at the top of the shell, and a pipeline connected to the vacuum exhaust hole of the vacuum filling head is provided at the bottom of the shell. In addition, a first position sensor 3.4 is also provided near the bottom of the shell. The bag-type dust collector 3 is generally installed above the dry powder filling pipe 1.

[0015] A dry powder recovery tank 4 with an inclined bottom plate is arranged between the dust collector 3 and the dry powder filling pipe 1, and the two are directly connected through multiple first valves 5; multiple return pipes 6 connected to the dry powder filling pipe 1 are arranged near the top surface of the side wall of the dry powder recovery tank 4, and each return pipe 6 is installed with a second valve 6.1; a second position sensor 6.2 is also installed on the top of the side wall of the dry powder recovery tank 4.

[0016] Furthermore, a fine filling tank 8 is installed above the fine filling tank 7. A second vacuum valve and a second pressure relief valve are arranged on the top of the fine filling tank 8, as well as a first feed pipe 8.1 connected to the lower end of the dry powder recovery tank 4, a second feed pipe 8.2 connected to the dry powder filling pipe 1, and a third valve 8.3 is installed on the first feed pipe 8.1, and a fourth valve 8.4 is installed on the second feed pipe 8.2, and the fine filling tank 8 and the fine filling tank 7 are directly connected through a fifth valve 8.5. In addition, a third position sensor 8.6 located near the top and a fourth position sensor 8.7 located near the bottom are also installed on the side wall of the fine filling tank 8.

[0017] The first valve 5, the second valve 6.1, the third valve 8.3, the fourth valve 8.4 and the fifth valve 8.5 are all pinch valves.

[0018] During the initial filling, the first vacuum valve 3.2 is opened, the first pressure relief valve 3.3 is closed, and the dry powder enters the vacuum filling head from the dry powder filling tube 1 for filling. The gas mixed with the light dry powder component enters the shell of the dust collector 3 through the vacuum exhaust hole, and the dry powder adheres to the outer wall of the bag 3.1. The gas enters the inner cavity of the bag 3.1 and enters the vacuum mechanism upward through the vacuum valve 3.2. When the amount of dry powder on the outer wall of the bag 3.1 is sufficient, the first vacuum valve 3.2 is closed, and the first pressure relief valve 3.3 is opened, so that the dry powder falls to the bottom of the dust collector 3 shell under the action of gravity. When the first position sensor 3.4 detects that the amount of dry powder at the bottom of the dust collector 3 reaches a predetermined value, the first valve 5 is opened, and the dry powder enters the dry powder recovery tank 4 under the action of gravity.

[0019] Generally, the dry powder in the dry powder recovery tank 4 first enters the fine filling tank 8, so that the recovered light components are first added to the fire extinguisher through the refilling process, so as to balance the components of the dry powder and improve the qualified rate of the fire extinguisher. Specifically, the second vacuum valve and the third valve 8.3 at the top of the fine filling tank 8 are opened, and the second pressure relief valve is closed, so that the dry powder in the dry powder recovery tank 4 enters the fine filling tank 8 under the action of negative pressure. When the third position sensor 8.6 detects that the dry powder in the dry powder recovery tank 4 reaches the high preset value, the second vacuum valve and the third valve 8.3 are closed, and the second pressure relief valve and the fifth valve 8.5 are opened, so that the dry powder falls into the fine filling tank 7 under the action of gravity. When the fourth position sensor 8.7 detects that the dry powder in the dry powder recovery tank 4 reaches the low preset value, the second pressure relief valve and the fifth valve 8.5 are closed, and the feeding to the fine filling tank 7 is stopped.

[0020] Secondly, the dry powder in the dry powder recovery tank 4 will be replenished into the dry powder filling tube 1. Generally, when the second position sensor 6.2 detects that the dry powder in the dry powder recovery tank 4 reaches the high preset value, the dry powder recovery tank 4 is placed in a normal pressure state, and the second valve 6.1 is opened to allow the dry powder to fall into the dry powder filling tube 1; the dry powder in the dry powder filling tube 1 either enters the dry powder filling port of the vacuum filling head through the branch pipe 2 for the initial filling of the fire extinguisher, or enters the fine filling tank 8 through the second feeding pipe 8.2 for the refilling of the fire extinguisher. To replenish the dry powder in the dry powder filling tube 1 into the fine filling tank 8, it is only necessary to place the fine filling tank 8 in a negative pressure state and open the fourth valve 8.4.

Claims

1. A dry powder recycling system for a fire extinguisher filling production line, comprising a dry powder filling pipe, wherein the dry powder filling pipe is provided with a branch pipe connected to a dry powder filling port of a vacuum filling head, characterized in that: The vacuum exhaust hole of the vacuum filling head is connected to the dust collector through a pipeline, the dust collector is connected to the dry powder recovery tank through a feed pipe with a first valve, and the dry powder recovery tank is connected to the dry powder filling pipe through a return pipe with a second valve; The dry powder recovery tank and the dry powder filling pipe are respectively provided with a first feeding pipe and a second feeding pipe connected to the fine filling tank, the fine filling tank is connected to the fine filling tank through the feeding pipe, and the first feeding pipe, the second feeding pipe and the feeding pipe are respectively provided with a third valve, a fourth valve and a fifth valve; The dry powder filling pipe, dry powder recovery tank and dust collector are arranged in sequence from bottom to top, and the fine filling feeding tank is located above the fine filling tank; the fine filling feeding tank and the dust collector housing are both provided with a vacuum valve and a pressure relief valve; a dust removal bag is provided in the dust collector housing, and the feed pipe at the bottom of the dust collector is connected to the top of the dry powder recovery tank; the return pipe connected to the dry powder filling pipe is provided in the middle of the dry powder recovery tank, and the first feed pipe connected to the fine filling feeding tank is provided at the bottom of the dry powder recovery tank; Position sensors are provided at the bottom of the dust collector, the top of the dry powder recovery tank, and the top and bottom of the fine filling tank; The dry powder filling tube is provided with a filter screen and an inspection window.

2. The dry powder recycling system for a fire extinguisher filling production line according to claim 1 is characterized in that: The bottom plate of the dry powder recovery tank is tilted, and the first feeding pipe is close to the lower end of the dry powder recovery tank.

3. The dry powder recycling system for a fire extinguisher filling production line according to claim 1 is characterized in that: The first valve, the second valve, the third valve, the fourth valve and the fifth valve are all pinch valves.

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