Automatic film suction mechanism of a packaging machine for stretch wrapping film

Abstract

The application discloses a kind of automatic film suction mechanism of stretch wrapping film packaging machine, it is related to the technical field of packaging film conveying, including the receiving trough being arranged below packaging machine bed, funnel-shaped bottom end of the receiving trough is extended and connected with film suction pipeline, film suction equipment is arranged in the receiving trough and film suction pipeline;The film suction equipment includes: impeller assembly, is arranged inside the receiving trough and film suction pipeline junction, and can move along film suction pipeline axis, by active guide vortex, avoid the accumulation and blockage of waste in the junction of receiving trough and film suction pipeline, realize the smooth, seamless transition of waste from wide collection area to narrow conveying pipeline, and the quality of qualitative leap is obtained to conveying efficiency and reliability, and after vortex captures waste, liquid using the action of rotation can also clean the surface of waste in reverse, realize conveying while cleaning waste.

Description

Technical Field

[0001] This invention relates to the field of packaging film conveying technology, and in particular to an automatic film suction mechanism for a packaging machine for stretch packaging film. Background Technology

[0002] During the production and processing of stretch packaging film, a large amount of lightweight, easily floating, and long strip-shaped packaging film waste and scraps are generated. The industry uses air extraction or hydraulic conveying methods. Air extraction collects the film, which can easily cause blockages. Hydraulic conveying collects these wastes through a receiving trough located under the packaging machine and uses water flow to transport them to a centralized processing point through a film suction pipe.

[0003] Current hydraulic collection methods rely on fixed impellers or simple agitators to create disturbances within the receiving tank, or depend entirely on negative pressure generated by an external pump. Fixed impellers generate eddies with limited range, concentrating energy primarily near the impeller. This results in low efficiency in capturing film waste dispersed across the liquid surface or suspended in different water layers. Large amounts of film remain afloat due to surface tension, or stagnate and accumulate in dead zones due to insufficient water flow. Furthermore, when localized eddies transition from a wide receiving tank to a narrow suction pipe, they rapidly diminish and dissipate due to the abrupt change in flow path, drastically reducing their waste-carrying capacity. This directly leads to waste easily accumulating and tangling at the connection between the receiving tank and the suction pipe, causing blockages and requiring frequent shutdowns for manual cleaning, severely impacting the continuity of automated production. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic film suction mechanism for a stretch packaging film packaging machine. It features an active guided vortex that prevents waste from accumulating and clogging at the connection between the receiving trough and the film suction pipe, achieving a smooth and seamless transition of waste from a wide collection area to a narrow conveying pipe. As a result, the conveying efficiency and reliability are significantly improved. Furthermore, after the vortex captures the waste, the rotating liquid can also clean the surface of the waste in the opposite direction, achieving the advantage of cleaning the waste while conveying it.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic film suction mechanism for a packaging machine for stretch packaging film, comprising a receiving groove disposed below the packaging machine tool, wherein a film suction pipe is extended and connected to the funnel-shaped bottom end of the receiving groove, and a film suction device is disposed in the receiving groove and the film suction pipe;

[0006] The film suction device includes:

[0007] An impeller assembly is disposed inside the connection between the receiving trough and the suction pipe, and is movable along the axis of the suction pipe;

[0008] A drive assembly is used to drive the impeller assembly to move along the axis of the suction pipe;

[0009] A driver for driving the impeller assembly to rotate;

[0010] The driver is configured to rotate the impeller assembly as it moves along the axis, such that when the impeller assembly moves to a position near the upper end of the receiving tank and below the liquid surface, the rotation causes the liquid in the receiving tank to generate a vortex. After the vortex is generated, the liquid gradually moves downward to extend the vortex into the suction pipe, thereby causing the packaging film waste that falls into the receiving tank to swing under the action of the vortex, move spirally along the vortex, and be transported and collected through the suction pipe.

[0011] Furthermore, the impeller assembly includes a rotating ring, blades, and an outer ring seat. The inner wall of the rotating ring is provided with a plurality of blades, and the outer wall of the rotating ring extends and is connected to an inner ring plate, which is slidably disposed within the outer ring seat.

[0012] Furthermore, the drive assembly includes a lead screw, a limiting rod, a telescopic sleeve, an internal rod, and a hinge. One end of the internal rod is connected to the outer wall of the impeller assembly, and the telescopic sleeve is fitted over the outside of the internal rod. One end of the telescopic sleeve is connected to the lead screw through the hinge. The lead screw is arranged parallel to the wall of the receiving groove, and the limiting rod is symmetrically arranged on the other wall of the receiving groove.

[0013] Furthermore, there are two telescopic sleeves, built-in rods, and hinges, which are symmetrically arranged on both sides of the impeller assembly, and one of the hinges covers the limiting rod.

[0014] Furthermore, the driver includes a drive ring mounted on the suction pipe via a bearing, a plurality of linkage rods being fixed annularly on the inner wall of the drive ring, and a plurality of linkage sleeves being annularly arranged on the lower end face of the impeller assembly, the linkage sleeves being inserted and sleeved with the linkage rods.

[0015] Furthermore, the driver also includes a rotary motor, and a gear that meshes with the output shaft of the rotary motor is sleeved on the outer wall of the drive ring.

[0016] Furthermore, the rotating ring has a sliding groove for the blade to slide, and one end of the blade is connected to an inner shaft.

[0017] Furthermore, the outer wall of the rotating ring is vertically arranged with several inner tubes. One end of the inner shaft is sealed to the inner wall of the inner tube through a sealing ring. One end of each inner tube passes through the inner ring plate and communicates with the inner groove of the outer ring seat.

[0018] Furthermore, one end of the built-in rod is sealed to the inner wall of the telescopic sleeve through a sealing ring gasket, and a central groove is provided inside the built-in rod for communication between the telescopic sleeve and the inner groove of the outer ring seat.

[0019] Furthermore, a conveyor chain assembly is provided below the suction pipe, and a liquid collection tank is provided below the conveyor chain assembly. The bottom side of the liquid collection tank is connected to the receiving trough through a pump and a pipe.

[0020] The technical effects and advantages of this invention are as follows:

[0021] This invention utilizes an actively guided vortex to ensure that the energy of the water flow is efficiently concentrated and utilized on the conveying path, providing a continuous and powerful force for waste to enter the pipeline. This avoids the accumulation and blockage of waste at the connection between the receiving trough and the suction pipe, achieving a smooth and seamless transition of waste from a wide collection area to a narrow conveying pipeline. As a result, the conveying efficiency and reliability have achieved a qualitative leap. Furthermore, after the vortex captures the waste, the rotating liquid can also clean the surface of the waste in the opposite direction, achieving simultaneous conveying and cleaning of the waste. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the receiving tank and film suction device of the present invention;

[0024] Figure 3 This is a schematic diagram of the membrane suction device of the present invention;

[0025] Figure 4 This is a schematic diagram of the driver structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the drive component structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the impeller assembly structure of the present invention;

[0028] Figure 7 For the present invention Figure 6 Enlarged view of point A;

[0029] Figure 8 For the present invention Figure 6 Enlarged view of point B.

[0030] In the picture:

[0031] 1. Feeding trough; 11. Film suction pipe; 13. Conveyor chain assembly; 14. Liquid collection tank;

[0032] 2. Film suction equipment; 21. Impeller assembly; 211. Rotating ring; 2111. Internal ring plate; 2112. Sliding groove; 2113. Inner tube; 212. Blade; 2121. Inner shaft; 213. Outer ring seat; 22. Drive assembly; 221. Lead screw; 222. Limiting rod; 223. Telescopic sleeve; 224. Internal rod; 225. Hinge; 23. Driver; 231. Drive ring; 232. Linkage rod; 233. Linkage sleeve; 234. Rotary motor. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Reference Figure 1 - Figure 8 An automatic film suction mechanism for a packaging machine for stretch packaging film is provided, including a receiving trough 1 set below the packaging machine tool, a film suction pipe 11 extending from the funnel-shaped bottom end of the receiving trough 1, and a film suction device 2 set inside the receiving trough 1 and the film suction pipe 11.

[0035] The film suction device 2 includes: an impeller assembly 21, which is disposed inside the connection between the receiving trough 1 and the film suction pipe 11 and is capable of moving along the axis of the film suction pipe 11; a drive assembly 22, which drives the impeller assembly 21 to move along the axis of the film suction pipe 11; and a driver 23, which drives the impeller assembly 21 to rotate.

[0036] The driver 23 is configured to drive the impeller assembly 21 to rotate as it moves along the axis, so that when the impeller assembly 21 moves to the upper end of the receiving tank 1 and is below the liquid surface, the rotation causes the liquid in the receiving tank 1 to generate a vortex, and after the vortex is generated, it gradually moves downward to extend the vortex into the film suction pipe 11, so that the packaging film waste falling into the receiving tank 1 is swung by the vortex, moves spirally along the vortex, and is transported and collected through the film suction pipe 11.

[0037] The impeller assembly 21 is not stationary; instead, it rotates at high speed under the drive of the driver 23, while the drive assembly 22 precisely controls its up-and-down movement along the axis of the film suction pipe 11. When the impeller assembly 21 moves to the upper part of the receiving tank 1 below the liquid surface, its rotational motion acts like a powerful vortex generator, forming a stable vortex center within the relatively spacious space of the receiving tank 1. The initial vortex effectively gathers and pulls the film waste scattered on the liquid surface or suspended in different water layers towards the vortex center, overcoming the problem of the film floating due to surface tension or stagnating due to insufficient water flow. The impeller assembly 21 then begins to move downwards along the axis. This downward movement actively pulls the gravitational center of the vortex towards the inlet of the film suction pipe 11 and even into the pipe, so that the generated vortex is no longer a localized water vortex confined to the inside of the receiving tank 1 that dissipates rapidly with increasing distance. Instead of flowing, the water is forcibly stretched and guided to form a spiral water flow channel that extends from the wide area of ​​the receiving trough 1 to the depth of the narrow suction pipe 11. Through the active guidance of the vortex, the water flow energy is ensured to be efficiently concentrated and utilized on the conveying path, providing a continuous and strong power for the waste to enter the pipe. This avoids the accumulation and blockage of waste at the connection between the receiving trough 1 and the suction pipe 11, achieving a smooth and seamless transition of waste from the wide collection area to the narrow conveying pipe. As a result, the conveying efficiency and reliability have achieved a qualitative leap. Moreover, after the vortex captures the waste, the rotating liquid can also clean the surface of the waste in the opposite direction, achieving cleaning of waste while conveying.

[0038] This equipment has excellent anti-clogging and self-cleaning capabilities, significantly reducing maintenance frequency and downtime. It utilizes fluid dynamics principles to solve problems such as waste entanglement and floating.

[0039] The specific principle is as follows: The powerful vortex generated by the impeller assembly 21 in the receiving tank 1 causes the liquid to undergo a strong circular and downward combined motion, which applies a continuous and complex hydrodynamic action to the falling packaging film waste. The shearing force generated by the vortex can effectively break up the initially agglomerated film clumps, preventing the waste from tangling into larger, difficult-to-handle clumps. The strong disturbance of the liquid makes it difficult for the film waste to adhere stably to the inner wall of the receiving tank 1, which plays a role in automatically cleaning the tank wall and preventing the deposition of dirt. When the waste enters the spiral water flow in the film suction pipe 11 formed by the extension of the vortex, the waste is arranged into a spiral motion trajectory that tends to move along the pipe axis. This not only provides the power for forward conveying, but also, due to its rotational characteristics, makes the contact between the waste and the inner wall of the pipe no longer a simple sliding friction, but a dynamic contact with a certain rolling and peeling effect. This greatly reduces the possibility of the film adsorbing and sticking to the inner wall of the pipe, and the high-speed rotating vortex and the conveyed waste also have a scouring effect on it.

[0040] When the driver 23 starts, it drives the impeller assembly 21 to rotate at high speed. Simultaneously, the driver assembly 22 lifts it to near the liquid surface below the receiving tank 1. The rotating impeller does work on the surrounding fluid, converting mechanical energy into the fluid's kinetic energy. This propels the fluid to mainly perform circular motion and, under centrifugal force, moves it outwards, causing a decrease in pressure in the impeller's central axis region. To maintain mass conservation, the surrounding fluid replenishes the low-pressure area from the bottom upwards, thus forming a composite three-dimensional flow with a downward component rotating around a vertical axis, creating a vortex. After the vortex stabilizes, the driver assembly 22 begins to control the impeller assembly 21 to move downwards at a uniform speed along the axis of the suction pipe 11. According to the continuity of fluid motion, the vortex shape changes accordingly. The downward movement of the impeller assembly 21 forces the fluid above it to continuously replenish downwards. Meanwhile, its rotation continues to provide tangential velocity to the fluid, and the vortex is dynamically elongated into a gradually converging spiral water column extending from the receiving trough 1 into the suction pipe 11. The spiral water column efficiently guides the energy generated by the impeller rotation into the conveying pipe, forming a strong and directional axial flow component in the suction pipe 11, providing the core power for material conveying. The vortex has a radial pressure gradient and tangential velocity, which can generate a pull towards the vortex center on the packaging film waste falling into the water. At the same time, the shear force of the vortex will destroy the surface tension of the film, causing it to wet and sink into the water, thus being effectively captured by the vortex. The captured packaging film waste has already acquired an initial velocity and a specific motion trajectory in the vortex of the receiving trough 1, and is then transported away after being drawn into the spiral water flow of the suction pipe 11.

[0041] The impeller assembly 21 includes a rotating ring 211, blades 212, and an outer ring seat 213. The inner wall of the rotating ring 211 is provided with a number of blades 212. The outer wall of the rotating ring 211 extends and is connected to an inner ring plate 2111. The inner ring plate 2111 is slidably disposed within the outer ring seat 213. The number of blades 212 constitutes the main body for generating vortices, realizing the separation of drive and support, and ensuring stability under high-speed rotation. The inner ring plate 2111, which extends and is connected to the outer wall of the rotating ring 211, is slidably disposed within the outer ring seat 213, so that the rotating ring 211 and the blades 212 on it can rotate smoothly at high speed under the support and guidance of the outer ring seat 213. The outer ring seat 213 itself is fixed and driven by the drive assembly 22, bearing all the load and friction required for movement, avoiding the direct application of axial movement stress to the rotating parts, and greatly improving the motion accuracy and service life.

[0042] The drive assembly 22 includes a lead screw 221, a limiting rod 222, a telescopic sleeve 223, an internal rod 224, and a hinge 225. One end of the internal rod 224 is connected to the outer wall of the impeller assembly 21. The telescopic sleeve 223 is fitted over the outside of the internal rod 224. One end of the telescopic sleeve 223 is connected to the lead screw 221 via the hinge 225. The lead screw 221 is parallel to the wall of the receiving groove 1, and the limiting rod 222 is symmetrically arranged on the other wall of the receiving groove 1. There are two telescopic sleeves 223, internal rods 224, and hinges 225, which are symmetrically arranged on both sides of the impeller assembly 21, and one of them... The hinge 225 is fitted onto the limiting rod 222. The lead screw 221 is set parallel to the wall of the receiving groove 1, providing a precise and stable linear drive source. The symmetrically set limiting rod 222 ensures that the impeller assembly 21 will not deflect or spin during movement, ensuring the linearity of the movement. The telescopic structure composed of the telescopic sleeve 223 and the built-in rod 224 can effectively transmit the thrust of the lead screw 221 to the rotating impeller assembly 21, and can also adapt to the situation that the circumferential position of the connection point of the impeller assembly 21 changes continuously when it rotates. The hinge 225 further releases the degree of freedom of movement.

[0043] Two telescopic sleeves 223, built-in rods 224, and hinges 225 are provided and symmetrically arranged on both sides of the impeller assembly 21. One of the hinges 225 is fitted onto the limiting rod 222, realizing the balance of forces and the statically indeterminate support of motion. The symmetrical drive and support on both sides make the driving force and support force evenly distributed, completely eliminating the overturning moment and ensuring that the impeller assembly 21 can move extremely smoothly along the axis to form a stable and symmetrical vortex.

[0044] The driver 23 includes a drive ring 231 mounted on the suction pipe 11 via bearings. Several linkage rods 232 are fixed in a ring on the inner wall of the drive ring 231. Several linkage sleeves 233 are arranged in a ring on the lower end face of the impeller assembly 21. The linkage sleeves 233 are inserted and sleeved with the linkage rods 232. The driver 23 is responsible for providing the power for the rotation of the impeller assembly 21, realizing the reliable transmission of power from the stationary frame to the axially moving parts. The drive ring 231 is mounted via bearings and its axial position is fixed, but it can rotate freely. When the rotary motor 234 drives the drive ring 231 to rotate via gears, the power is transmitted to the impeller assembly 21 through the insertion structure of the linkage rods 232 and the linkage sleeves 233. Since the linkage sleeves 233 can slide freely along the linkage rods 232 in the axial direction, the up and down movement of the impeller assembly 21 is completely unrestricted, perfectly decoupling the rotational motion and the linear motion.

[0045] The driver 23 also includes a rotary motor 234, and the outer wall of the drive ring 231 is fitted with a gear that meshes with the output shaft of the rotary motor 234.

[0046] The rotating ring 211 has a sliding groove 2112 for sliding the blade 212, and one end of the blade 212 is connected to an inner shaft 2121. Several inner tubes 2113 are arranged vertically in a ring on the outer wall of the rotating ring 211. One end of the inner shaft 2121 is sealed to the inner wall of the inner tube 2113 through a sealing ring. One end of the multiple inner tubes 2113 passes through the inner ring plate 2111 and communicates with the inner groove of the outer ring seat 213. The arrangement of the inner shaft 2121 and the sliding groove 2112 realizes the dynamic or stepless adjustment of the blade angle, thereby adapting to different working conditions. By controlling the position of the inner shaft 2121 in the inner groove 2112, the angle of attack of the blade 212 relative to the plane of rotation can be changed. Increasing the angle of attack can improve the stirring intensity and pumping capacity of the liquid. When the blade 212 is at the top, the stirring efficiency is improved by increasing the blade area, realizing the rapid generation of vortices and increasing the vortex velocity. When it is moved down, the angle of attack is reduced, reducing the problem of film entanglement.

[0047] One end of the built-in rod 224 is sealed to the inner wall of the telescopic sleeve 223 via a sealing ring gasket. A central groove is provided within the built-in rod 224 for communication between the telescopic sleeve 223 and the inner groove of the outer ring seat 213, forming a sophisticated hydraulic control system. This system enables centralized, synchronous, and reliable remote control of the blade angle, eliminating the need for complex electric or mechanical adjustment mechanisms for each blade 212. The hydraulic lines for controlling the blade angle are cleverly integrated within the drive assembly 22. When the impeller assembly 21 moves up and down, the relative expansion and contraction between the telescopic sleeve 223 and the built-in rod 224 automatically maintains the connection of this hydraulic channel. By injecting or venting gas or liquid into the inner groove of the outer ring seat 213, all inner shaft rods 2121 can be driven to move synchronously, thereby uniformly adjusting the angle of all blades 212. The overall structure is compact, with a fast response speed, high control force, and stable operation in underwater environments. The system eliminates the need for easily tangled or worn external hoses, greatly improving reliability and avoiding potential interference from external pipelines.

[0048] Below the suction pipe 11, a conveyor chain assembly 13 is installed, and below the conveyor chain assembly 13, a liquid collection tank 14 is installed. One side of the bottom of the liquid collection tank 14 is connected to the receiving tank 1 through a pump and a pipe, forming an efficient solid-liquid separation and media circulation system, realizing continuous and automated waste treatment and resource recycling. The solid-liquid mixture discharged from the suction pipe 11 first falls onto the conveyor chain assembly 13. While conveying the wet packaging film waste, the conveyor chain assembly 13 can effectively filter out most of the liquid carried, realizing preliminary solid-liquid separation. The separated liquid falls into the liquid collection tank 14 below, and after sedimentation or simple filtration, it is pumped back to the receiving tank 1 for recycling.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic film suction mechanism for a stretch packaging film packaging machine, comprising a receiving trough (1) disposed below the packaging machine tool, wherein a film suction pipe extends from the funnel-shaped bottom end of the receiving trough (1), characterized in that, The receiving trough (1) and the suction pipe are equipped with suction equipment (2). The film suction device (2) includes: The impeller assembly (21) is located inside the connection between the receiving trough (1) and the suction pipe, and is movable along the axis of the suction pipe; A drive assembly (22) is used to drive the impeller assembly (21) to move along the axis of the suction pipe; A driver (23) is used to drive the impeller assembly (21) to rotate; The impeller assembly (21) includes a rotating ring (211), blades (212), and an outer ring seat (213). The inner wall of the rotating ring (211) is provided with a plurality of blades (212). The outer wall of the rotating ring (211) extends and is connected to an inner ring plate (2111). The inner ring plate (2111) is slidably disposed in the outer ring seat (213). The drive assembly (22) includes a lead screw (221), a limiting rod (222), a telescopic sleeve (223), an inner rod (224), and a hinge (225). One end of the inner rod (224) is connected to the outer wall of the impeller assembly (21). The outer side of the inner rod (224) is covered with a telescopic sleeve (223). One end of the telescopic sleeve (223) is connected to the lead screw (221) through the hinge (225). The drive (23) is arranged parallel to the wall of the receiving trough (1) and the limiting rod (222) is symmetrically arranged on the other wall of the receiving trough (1). The drive (23) includes a drive ring (231) mounted on the suction pipe by bearings. Several linkage rods (232) are fixed in a ring on the inner wall of the drive ring (231). Several linkage sleeves (233) are arranged in a ring on the lower end face of the impeller assembly (21). The linkage sleeves (233) are inserted and sleeved with the linkage rods (232). The drive (23) also includes a rotary motor (234). A gear that meshes with the output shaft of the rotary motor (234) is sleeved on the outer wall of the drive ring (231). A sliding groove (2112) for sliding blades (212) is opened in the rotating ring (211). One end of the blade (212) is connected to an inner shaft rod (2121). The driver (23) is configured to drive the impeller assembly (21) to rotate as it moves along the axis, so that when the impeller assembly (21) moves to the upper end of the receiving tank (1) and is below the liquid surface, the rotation causes the liquid in the receiving tank (1) to generate a vortex, and after the vortex is generated, it gradually moves downward to extend the vortex into the film suction pipe, so that the packaging film waste that falls into the receiving tank (1) is swung by the vortex, moves spirally along the vortex, and is transported and collected through the film suction pipe.

2. The automatic film suction mechanism for a packaging machine for stretch packaging film according to claim 1, characterized in that, Two telescopic sleeves (223), built-in rods (224) and hinges (225) are provided, respectively symmetrically arranged on both sides of the impeller assembly (21), and one of the hinges (225) is fitted onto the limiting rod (222).

3. The automatic film suction mechanism for a packaging machine using stretch packaging film according to claim 1, characterized in that, The outer wall of the rotating ring (211) is vertically arranged with several inner tubes (2113). One end of the inner shaft (2121) is sealed to the inner wall of the inner tube (2113) through a sealing ring. One end of the multiple inner tubes (2113) passes through the inner ring plate (2111) and communicates with the inner groove of the outer ring seat (213).

4. The automatic film suction mechanism for a packaging machine for stretch packaging film according to claim 1, characterized in that, One end of the built-in rod (224) is sealed to the inner wall of the telescopic sleeve (223) through a sealing ring gasket, and a central groove is provided in the built-in rod (224) for the telescopic sleeve (223) and the inner groove of the outer ring seat (213) to communicate with each other.

5. The automatic film suction mechanism for a packaging machine using stretch packaging film according to claim 1, characterized in that, Below the suction pipe is a conveyor chain assembly (13), and below the conveyor chain assembly (13) is a liquid collection tank (14). The bottom side of the liquid collection tank (14) is connected to the receiving trough (1) through a pump and a pipe.

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