KR101973579B1 - Exhaust system for bulktank - Google Patents

Abstract

The present invention relates to a discharge system for a bulk tank and, more specifically, to a discharge system for a bulk tank which adjusts a suction inlet to be capable of controlling a discharge quantity and a suction force. The discharge system for the bulk tank according to the present invention is configured to form an input port at an upper part, to form an inner space which is to be filled with cargo, and to be capable of discharging the cargo filled in a tank body which has a floor surface obliquely formed therein. The discharge system for the bulk tank comprises: an external discharge unit having one side end portion positioned at the outside of the tank body to enable the cargo within the tank body to be externally discharged and the other end portion penetrated through and coupled to a side surface of the tank body to be positioned in the space within the tank body; an internal discharge unit having one side coupled to the other side end portion of the external discharge unit and the other side bent-formed toward the lowest point on the floor surface within the tank body, and forming the suction inlet, through which the cargo can be sucked, at the other side end portion; and an adjustment unit positioned to face a floor surface of the suction inlet and installed on the floor surface of the tank body, wherein the adjustment unit has an upper surface vertically moving within the tank body according to the quantity of the cargo to be capable of adjusting the distance between the floor surface of the suction inlet and the upper surface of the adjustment unit.

Description

Bulk Tank Discharge System {Exhaust system for bulktank}

The present invention relates to a bulk tank discharge system, and more particularly to a bulk tank discharge system capable of adjusting the discharge and suction force by adjusting the inlet interval.

Bulk tanks are generally containers for storing and transporting powders such as cement, feed, and grains, which are installed in bulk tank transport vehicles to load particulate cargo such as cement, feed, and grains into the tanks and transport them to their destinations. It is then used to pressurize the high pressure air inside the tank through the air supply line to transfer the cargo to silos.

The bulk tank is composed of a tank filled with cargo, a charging part for filling the cargo with the tank, and a transfer device for transporting the cargo inside the tank to the outside. Among them, tanks are generally formed to be inclined or curved sidewalls so that they can be stacked from the bottom when the cargo is filled inside, and the bottom is often formed to be inclined with one or two points as the lowest point. It exists in the form of a hole on the upper side of the cargo is configured to be loaded by its own weight through the hole, and after the input of the material is often configured to cover the hole with a cover.

On the other hand, in the case of a transfer device for transporting the cargo inside the tank to the outside, a variety of methods such as mechanical transfer, transfer using a blower is used, various techniques for smooth transfer has been developed. For example, in Korean Utility Model Registration No. 20-0247879, in a feed transportation vehicle equipped with a storage tank including a hopper, an open / close feed inlet and a feed discharge line communicating with one end of the hopper, the electric storage tank includes a plurality of compartments. Each compartment includes a hopper, an open / close feed inlet, a feed discharge pipe, a pneumatic conveying pipe connected to the wall of the hopper, and a canvas filtering device provided between the hopper and the pneumatic conveying pipe, and a compressor is provided outside the electric storage tank. Located, the electric compressor is communicated through the electric pneumatic conveying pipe and the pneumatic induction pipe, the pneumatic discharge method of the electric pneumatic induction pipe and the feed discharge pipe is communicated through the connecting pipe is disclosed. In addition, Korean Patent Application Publication No. 10-2012-0107296 discloses a storage tank having a discharge port formed on a bottom surface thereof, and having an air buffer space formed therein by a hard plate, and an air flow in the storage tank being pressed toward the discharge port side. Disclosed is a bulk trailer comprising a pressure holding means and an air supply canvas tube disposed in the storage tank and communicating with the air buffer space.

However, such a conventional discharge system or a bulk tank or a trailer equipped with such a discharge system has a fixed suction position for discharging cargo in the tank to the outside, so that the suction force is varied depending on the type and amount of material in the tank. There was a problem that the transfer efficiency is lowered because it can not be adjusted.

(Patent Document 1) Korean Utility Model Model No. 20-0247879

(Patent Document 2) Korean Patent Publication No. 10-2012-0107296

The present invention has been made to solve the above-mentioned problems, an object of the present invention is to provide a bulk tank discharge system capable of adjusting the discharge and suction force by adjusting the distance between the suction port and the bottom surface.

An object of the present invention described above, the inlet is formed in the top and the space is formed so that the cargo can be filled therein, the bulk provided to discharge the cargo filled in the interior of the tank body is formed inclined bottom surface inside In the tank discharge system, the outer end is penetrated to the side of the tank body so that one end is located outside the tank body and the other end is located in the space in the tank body to discharge the cargo inside the tank body to the outside The discharge portion, and the inner discharge portion is coupled to the other end of the outer discharge pipe and the other side is bent toward the lowest point of the bottom surface of the inside of the tank body and the suction port for suctioning the cargo at the other end And, positioned to face the bottom surface of the suction port and includes an adjustment unit is installed on the bottom surface of the tank body, The control unit may be achieved by providing a bulk tank discharging system, characterized in that the upper surface is moved up and down so that the distance between the bottom surface of the suction unit and the upper surface of the control unit can be adjusted according to the amount of cargo in the tank body. Can be.

According to a preferred feature of the present invention, the control unit may include a base which is installed on the bottom surface of the tank body and a movable portion slidably coupled upward from the base.

According to another preferred feature of the present invention, the control unit further includes a pressure spring installed on the lower side of the moving portion to press the moving upwards, the tank body as the amount of cargo in the tank body increases As the pressure increases, the moving part is pressurized, the moving part is lowered, and the amount of cargo in the tank body decreases, so that the pressure inside the tank body decreases and the pressure applied to the moving part decreases, so that the moving by the pressure spring. The wealth can be raised.

According to another preferred feature of the present invention, the adjusting portion further includes an auxiliary bar coupled to the lower side of the moving part and integrally moved with the moving part, wherein the auxiliary bar limits the movement distance upward of the moving part at the end. It can have a stop ring.

According to another preferred feature of the present invention, the adjusting portion may be provided with an O-ring to prevent the cargo from entering the space in which the pressure spring is disposed on the contact surface of the base and the moving portion.

According to another preferred feature of the present invention, the control unit may include a base installed on the bottom surface of the tank body, a moving part slidably coupled to the base and a canvas coupled to the upper side of the moving part.

According to another preferred feature of the invention, the adjusting unit further comprises an air injection unit is installed through the lower side of the tank body to inject air into the space between the base and the canvas, the canvas is self-weight The canvas may be raised upward by being lowered by the compressed air supply by supplying compressed air through the air injection unit.

According to another preferred feature of the present invention, the adjusting unit may further include a pressing spring installed on the base to press the canvas upwards.

According to another preferred feature of the invention, at the end of the moving portion may be formed a locking step for limiting the moving distance upward of the canvas.

According to the bulk tank discharging system according to the present invention, since the distance between the discharge portion and the bottom can be adjusted, the suction amount by increasing the discharge amount by increasing the distance when the amount of cargo in the tank is large, and narrowing the distance when the amount of cargo is small Can increase.

In addition, according to the bulk tank discharge system according to the present invention, the pressure in the tank body is naturally changed according to the amount of cargo can be automatically adjusted the distance between the outlet and the bottom.

In addition, according to the bulk tank discharge system according to the present invention, the distance between the discharge portion and the floor can be adjusted as needed by using the external high-pressure air.

1 is a front view of a bulk tank discharge system according to an embodiment of the present invention.
2 and 3 is an essential state operation of the bulk tank discharge system shown in FIG.
4 is a front view of a bulk tank discharging system according to another embodiment of the present invention.
5 and 6 is a main operation state diagram of the bulk tank discharge system shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments described below are just described in detail enough to be easily carried out by those of ordinary skill in the art, which does not mean that the protection scope of the present invention is limited. Do not.

1 to 4, a bulk tank discharging system according to an embodiment of the present invention will be described. Bulk tank discharging system according to an embodiment of the present invention is provided for discharging the cargo in the tank body 100 is filled with particulate cargo such as cement, feed, grains therein, the external discharge unit 200, internal discharge The unit 300, the control unit 400 and the air supply unit 500 is included.

First, referring to the tank body 100, as shown in Figure 1, the tank body 100 is formed with an injection hole in the upper portion and a space for filling the cargo is formed therein. These spaces are filled with particulate cargo, and when the cargo to be filled is discharged, it is formed to be inclined about one or two points so as to be naturally collected and discharged to the lowest point. Therefore, according to this configuration, the cargo inside the tank body 100 naturally gathers to the lowest point of the tank body 100 and is discharged to the outside through the inner discharge part 300 and the outer discharge part 200.

As shown in FIG. 1, the external discharge unit 200 is coupled to the side surface of the tank body 100 so as to communicate the inside and the outside of the tank body 100. Therefore, one end of the external discharge unit 200 is located outside the tank body 100, and the other end is located inside the tank body 100 so that the cargo inside the tank body 100 is the external discharge unit 200. Can be discharged to the outside.

As shown in Figure 1, the inner discharge portion 300, one side is coupled to the other end of the outer discharge portion 200, the other side is bent toward the lowest point of the bottom surface of the tank body (100) . The other end of the internal discharge portion 300 is formed with a suction port 310 for sucking the cargo. Therefore, as shown in FIG. 1, the inlet 310 of the inner discharge part 300 is disposed to be positioned at the lowest point of the tank body 100, and the cargo in the tank body 100 is naturally tanked by its own weight. By gathering to the lowest point of the (100), the cargo can be discharged without remaining in the tank body (100).

Inlet 310 may be configured in a structure that is advantageous for the suction end is extended toward the outside as shown, it is not limited to this may be of the same size and shape as the diameter of the pipe of the inner discharge portion (300) It may be formed to have a square cross section.

The adjusting unit 400 is installed at the position facing the inlet 310, and thus the end of the inner discharge part 300 is bent toward the lowest point of the tank body 100, so the bottom of the tank body 100 is lowest. It may be expressed as being installed on a surface.

Adjuster 400 is the upper surface is adjusted up and down so that the cargo in the tank body 100 can be easily sucked into the suction port 310, for this purpose includes a base 410, the moving part 420, the pressure spring 430, the auxiliary bar 440, the stop ring 441 and the O-ring 450 may be further included.

The adjusting unit 400 may be manually adjusted, but may be automatically adjusted by the pressure inside the tank body 100 by installing a pressure spring 430 or the like. When the amount of cargo in the tank body 100 is large, the control unit 400 has a small empty space inside the tank body 100 so that the pressure inside the tank body 100 is high, so that the bottom surface of the inlet 310 By increasing the distance between the upper surface of the control unit 400 and the effect of increasing the suction area is adjusted to increase the amount of discharge at the same time, if the amount of cargo is small, the empty space inside the tank body (100) increases the tank body Since the pressure inside the 100 is reduced, the distance between the bottom surface of the suction port 310 and the top surface of the control unit 400 is narrowed to adjust the suction force and increase the suction force at the same time. Although the adjustment unit 400 will be described later, the height may be automatically or manually adjusted in real time according to the remaining amount of cargo in the tank body 100.

In detail, the compressed air is introduced from the air supply unit 500 into the tank body 100 when the cargo is discharged. In this way, the compressed air is increased to increase the pressure inside the tank. At this time, when the external discharge unit 200 is opened for discharge, the compressed air is dropped into the external discharge unit 200 through the internal discharge unit 300 having a low pressure. Cargo is transported on exit. However, since the size of the empty space inside the tank body 100 varies depending on the remaining amount of cargo in the tank body 100, the time taken to raise the pressure for the discharge is different. In other words, the compressed air The pressure and supply per hour is constant, but if there is a large amount of cargo in the tank body 100, the pressure rises quickly because the empty space is small and vice versa relatively slow.

And, when the discharge is started, as the amount of cargo decreases, the pressure decreases as the empty space inside the tank body 100 increases. Therefore, although the time required for discharging varies strictly according to the size of the empty space, it can be expressed that it can be adjusted automatically or manually according to the remaining amount of cargo in the tank body 100.

Base 410 is installed on the bottom surface of the tank body 100, as shown in Figure 2 and 3, may be installed to protrude to the lower side of the bottom surface. The moving part 420 is slidably coupled to the base 410, and the base 410 serves as a guide and at the same time serves as a guide for moving the moving part 420 upward. A space may be formed in the base 410, and thus, the auxiliary bar 440 may be penetrated and the pressure spring 430 may be installed inside the base 410.

As shown in FIGS. 2 and 3, the base 410 may be provided with an O-ring 450 so that cargo does not flow into the base 410, and the inside of the base 410 is sealed by the O-ring 450. The furnace cargo may be introduced to prevent the mobile unit 420 from fully descending downward.

As illustrated in FIGS. 2 and 3, the moving part 420 may be formed in a c shape, and may be slidably coupled to the inside of the base 410 as shown. At this time, this is an example and the moving unit 420 may be slidably coupled to the outside of the base 410 without being necessarily coupled to the inside of the base 410 as shown, depending on the configuration of the base 410 It is also possible to be coupled to the upper side of the).

The O-ring 450 may be installed on a surface where the moving part 420 and the base 410 abut, and the O-ring 450 also has a cargo inside the base 410 like the O-ring 450 installed on the base 410. Block incoming At this time, when the moving part 420 is coupled to the inside of the base 410, the O-ring 450 is formed on the outer surface of the moving part 420, and, of course, the moving part 420 is the outside of the base 410. When the sliding is coupled to the O-ring is formed on the inner surface of the moving part 420, which is obvious in design, and thus detailed illustration thereof will be omitted.

The pressure spring 430 is installed below the moving part 420 and serves to press the moving part 420 upward. Therefore, when the pressure in the tank body 100 is low, the moving part 420 is maintained by the pressure spring 430, as shown in Figure 2, while compressed air flows into the air supply unit 500 When the pressure is increased as the pressure in the tank body 100 is raised is gradually lowered. In this process, the moving unit 420 is lowered to the lowest point, as shown in FIG. 3.

Subsequently, when the cargo inside the tank body 100 is discharged, the discharge is started through the inlet 310 in the state in which the moving part 420 is at the lowest point as shown in FIG. 3, and gradually the tank body ( As the load in the tank 100 decreases, the pressure applied to the moving unit 420 decreases as the pressure in the tank body 100 decreases, so that the moving unit 420 is moved by the pressure spring 430 as shown in FIG. 2. As it gradually rises upwards, the suction power is increased.

The pressing spring 430 may be installed inside the base 410 and the moving part 420, as shown, is not limited to this to press the lower side of the moving part 420 from the outside of the base 410 It may be configured in the form.

The auxiliary bar 440 is coupled to the lower side of the moving part 420, and is configured to move integrally with the moving part 420. The auxiliary bar 440 serves to guide the pressure spring 430 to be stably arranged, and at the same time, the stop ring 441 is coupled to the end to limit the moving distance upward of the moving part 420. It also plays a role. The auxiliary bar 440 may be formed of a pipe, and may be formed to penetrate the inside of the base 410 as shown.

As shown in FIG. 1, the air supply unit 500 is provided to inject compressed air into the tank body 100. The air supply unit 500 is coupled to the side of the tank body 100 to communicate with the inside and the outside of the tank body 100 and opened and closed as necessary to supply compressed air or to the outside and the inside of the tank body 100 It can be sealed. Therefore, one end of the air supply unit 500 is located outside the tank body 100, and the other end is located inside the tank body 100, so that compressed air may be supplied into the tank body 100 if necessary.

So far it has been described with respect to the bulk tank discharge system according to an embodiment of the present invention, the following will be described the operation state accordingly.

Referring to the operation of the bulk tank discharge system according to an embodiment of the present invention, first, when the pressure in the tank body 100 is low, the moving part 420, as shown in Figure 2, by the pressure spring 430 Stay elevated. Then, when compressed air is introduced into the air supply unit 500 while cargo is introduced into the tank body 100, the moving unit 420 gradually descends as the pressure in the tank body 100 rises. In this process, the moving unit 420 is lowered to the lowest point, as shown in FIG. 3.

Subsequently, when the cargo inside the tank body 100 is discharged, the discharge is started through the inlet 310 in the state in which the moving part 420 is at the lowest point as shown in FIG. 3, and gradually the tank body ( As the load in the tank 100 decreases, the pressure in the tank body 100 decreases, so that the pressure applied to the moving unit 420 decreases. Thus, the moving unit 420 is moved by the pressure spring 430 as shown in FIG. 2. As you rise upwards will increase the suction power.

In this process, the user using the bulk tank discharging system according to the embodiment of the present invention can adjust the distance between the inlet port 310 and the bottom, so if the amount of cargo in the tank is large, increase the discharge amount by increasing the distance of the cargo In small quantities, a bulk tank discharge system can be used to increase suction by narrowing the distance.

In addition, it is possible to use a bulk tank discharge system in which the distance between the outlet and the bottom is automatically adjusted by the change of the pressure in the tank according to the amount of cargo.

Next, a bulk tank discharge system according to another embodiment of the present invention will be described with reference to FIGS. 4 to 7. Bulk tank discharging system according to another embodiment of the present invention includes an external discharge unit 200, the internal discharge unit 300, the control unit 400 ', wherein the external discharge unit 200, the internal discharge unit 300 ) Is substantially the same as the external discharge unit 200, the internal discharge unit 300 of the bulk tank discharge system according to the embodiment of the present invention described above will not be described herein any further description will be described only for the control unit 400 ' do.

Adjusting unit 400 ′ according to another embodiment of the present invention serves to adjust the suction amount and the suction pressure by adjusting the distance to the suction port 310 by moving the upper surface up and down as in the above-described embodiment. It includes a base 410 ', the moving unit 420', the canvas 460, it may further include an air injection unit 470.

The control unit 400 ′ is installed at a position facing the inlet 310, and thus, the end of the inner discharge part 300 is bent toward the lowest point of the tank body 100, so that the control unit 400 ′ is most in the tank body 100. It can also be expressed as being installed on a low floor. At this time, two or more points of the bottom surface of the tank body 100, as shown in Figure 4 can be configured low, in which case the control unit 400 'is also installed at each point accordingly.

The control unit 400 ′ may be manually adjusted, but may be automatically adjusted by the weight of the cargo by installing a pressure spring 430 ′. Unlike the above-described embodiment, the air injection unit 470 may be adjusted. It may include, it may be adjusted by the compressed air introduced from the air injection unit 470. If the amount of cargo in the tank body 100 is large, the control unit 400 'has an effect of increasing the suction area by widening the distance between the bottom surface of the suction port 310 and the upper surface of the control unit 400'. It is adjusted to increase the discharge amount at the same time as the spring, and when the amount of cargo is small, the effect of reducing the suction area by reducing the distance between the bottom surface of the suction port 310 and the upper surface of the control unit 400 'is increased at the same time. Adjusted to height. The control unit 400 ′ may automatically adjust the height in real time by automatically or manually changing the pressure in the tank body 100 according to the remaining amount of cargo in the tank body 100.

The base 410 ′ is installed on the bottom surface of the tank body 100, and as shown in FIG. 4, the bottom of the tank body 100 may be installed at two or more places. The base 410 'may be installed to protrude downward from the bottom surface of the tank body 100, and serves to support the moving part 420' and the canvas 460. The moving part 420 'is slidably coupled to the base 410', and the base 410 'serves as a guide while serving to move the moving part 420' upward. Do it.

The moving part 420 'is installed to be slidable up and down on the base 410', and as shown in FIGS. 5 and 6, may be coupled to the base 410 '. A locking jaw 421 may be formed at the end of the moving part 420 'to limit the moving distance upward of the moving part 420', and the canvas 460 may be coupled to the upper part of the moving part 420 '. Thus, the moving unit 420 ′ and the canvas 460 are integrally moved.

A moving spring 430 'may be installed on the moving part 420', and the pressing spring 430 'serves to press the canvas 460 upward. Since the movable mechanism by the pressure spring 430 'is the same as in the above-described embodiment of the present invention, a detailed description thereof will be omitted.

The canvas 460 is coupled to the upper side of the moving part 420 ', and the cargo is seated on the upper surface. The canvas 460 may be generally configured in the same manner as installed on the bottom surface of the bulk tank, and may be made of a rubber material.

The canvas 460 is integrally moved with the moving part 420 ', and by adjusting the distance between the upper surface of the canvas 460 and the bottom surface of the suction port 310, the bulk tank discharging system according to the present invention is a cargo Adjust the suction amount and suction power.

The canvas 460 is installed at a predetermined interval from the bottom surface of the tank body 100, and thus a space is formed therebetween. Compressed air flows into such a space and the canvas 460 may be pressed upward and moved. For this purpose, an air injection unit 470 is formed on the side of the tank body 100.

The air injection unit 470 is installed to penetrate the lower side of the tank body 100, and thus the control unit 400 'is supplied by the compressed air through the air injection unit 470 from the outside of the tank body 100. Will be controlled.

 So far it has been described with respect to the bulk tank discharge system according to another embodiment of the present invention, the following will be described with respect to the operating state accordingly.

Referring to the operation of the bulk tank discharge system according to another embodiment of the present invention, first, if there is no cargo in the tank body 100, the compressed air is not introduced from the air injection unit 470, and thus the moving unit 420 'and As shown in FIG. 5, the canvas 460 is lowered due to a low pressure in the tank body 100. After the cargo can be filled in the tank body 100, it can be discharged as needed after filling.

At this time, in order to discharge the cargo in the tank body 100, compressed air is introduced from the air injection part 470, and the moving part 420 'and the canvas 460 are moved upward by the pressure, and such compression is performed. The pressure and amount of air can be adjusted by the user as needed to adjust the distance between the canvas 460 and the inlet 310.

In this process, the user using the bulk tank discharging system according to another embodiment of the present invention can adjust the distance between the suction port 310 and the canvas 460, thereby increasing the distance when the amount of cargo in the tank is large. Bulk tank discharge systems can be used to increase suction and increase the suction capacity by narrowing the distance if the cargo is small.

Although the embodiments of the present invention have been described above, it will be understood by those skilled in the art that various modifications may be made without departing from the scope of the claims of the present invention.

100: tank body 200: external discharge unit
300: internal discharge portion 310: inlet
400, 410 ': control part 410, 410': base
420, 420 ': moving part 421: locking jaw
430, 430 ': pressure spring 440: auxiliary bar
441: stop ring 450: O-ring
460: canvas 470: air injection unit
500: air supply unit

Claims (9)

In the bulk tank discharge system is formed so that the inlet is formed in the upper portion and the space is formed so that the cargo can be filled therein, and the cargo filled inside the tank body is formed to be inclined bottom surface inside, discharged,
An outer discharge part penetratingly coupled to a side surface of the tank body such that one end is located outside the tank body and the other end is located in a space in the tank body so that the cargo inside the tank body is discharged to the outside;
An inner discharge portion having one side coupled to the other end of the outer discharge portion and the other side bent toward the lowest point of the bottom surface of the inside of the tank body, and having an inlet for suctioning cargo at the other end; And
It is positioned to face the bottom surface of the suction port and includes an adjustment unit is installed on the bottom surface of the tank body,
The control unit according to the amount of cargo in the tank body bulk tank discharge system characterized in that the upper surface is moved up and down so that the distance between the bottom surface of the suction port and the upper surface of the control unit can be adjusted. The method of claim 1,
The control unit is a bulk tank discharging system, characterized in that it comprises a base which is installed on the bottom surface of the tank body and a moving part slidably coupled upward from the base. The method of claim 2,
The adjusting unit further includes a pressing spring installed below the moving unit to press the moving unit upward, and as the amount of cargo in the tank body increases, the pressure inside the tank body rises and the moving unit is pressurized. As the moving part is lowered and the amount of cargo in the tank body is reduced, the pressure inside the tank body is lowered, and the pressure applied to the moving part is decreased, so that the moving part is raised by the pressure spring. Exhaust system. The method of claim 3, wherein
The control unit further includes an auxiliary bar coupled to the lower side of the moving unit and integrally moved with the moving unit, wherein the auxiliary bar has a stop ring for limiting a moving distance to the upper side of the moving unit at an end thereof. Tank exhaust system. The method according to claim 3 or 4,
The adjustment unit is bulk tank discharging system, characterized in that the O-ring is installed on the contact surface of the base and the moving unit to prevent the cargo from entering the space where the pressure spring is arranged. The method of claim 1,
The control unit is a bulk tank discharging system, characterized in that it comprises a base which is installed on the bottom surface of the tank body, a moving part slidably coupled to the base and a canvas coupled to the upper side of the moving part. The method of claim 6,
The control unit further includes an air injection unit installed through the lower side of the tank body to inject air into the space between the base and the canvas, the canvas is lowered by its own weight and compressed through the air injection unit A bulk tank discharging system, characterized in that the canvas is raised upwards by supplying air to press the canvas upwards. The method of claim 7, wherein
The adjustment unit further comprises a bulk tank discharge system characterized in that it further comprises a pressure spring installed on the base to press the canvas upwards. The method according to any one of claims 6 to 8,
Bulk tank discharging system, characterized in that the locking step is formed at the end of the moving part to limit the moving distance to the upper side of the canvas.

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