Bag-making equipment and bag-making filling and sealing system

Abstract

The bag making equipment comprises a film releasing mechanism, a roller film feeding mechanism, a film pulling mechanism, a bag making welding area, a conveying line and a pipe opening welding mechanism, the film releasing mechanism, the roller film feeding mechanism, the bag making welding area and the pipe opening welding mechanism are sequentially arranged, and the film pulling mechanism and the conveying line are arranged on the same side of the bag making welding area. The film drawing mechanism comprises a film drawing head, a linear drive and an avoiding drive, and the linear drive and the avoiding drive are used for driving the film drawing head to reciprocate at the two ends of the bag making welding area; the bag making, filling and sealing system comprises the bag making equipment, the conveying line is a circulating conveying line, and a pipe opening welding mechanism, a waste edge cutting station, a bag transferring and reversing station, a filling station, a sealing station and a bag discharging station are sequentially arranged on the conveying line. The mounting distance is shortened, the problems that the longer the film feeding distance is, the more likely to generate film falling faults and film feeding deviation are solved, and the problems of low stability and qualified rate caused by the problems are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of soft bags, and in particular to a bag making device and a bag making and filling system. Background Art

[0002] Non-PVC film soft bag large infusion products have become the mainstream products in the pharmaceutical market, and their clinical usage is increasing. How to produce soft bag large infusion products in large quantities with high quality and low cost to meet the growing market demand.

[0003] Existing bag-making technologies, such as a bag-making and forming device, a tail-filling soft bag production line and a production method with patent number CN105416688B, are provided with a linear module between printing and bag-making to perform linear film feeding. As the soft bag production capacity continues to increase, the number of bags required to be made each time increases from 2 bags to 4 bags or 6 bags or even 8 bags or more, the linear module will be set longer and longer, causing the entire machine to become longer, while the stability and speed of film feeding are reduced, thereby affecting the final production quality and pass rate of soft bag infusion products. Summary of the invention

[0004] The purpose of the invention is to provide a bag making equipment and a bag filling and sealing system, which solves the problem that as the bag making capacity continues to increase, the existing whole machine equipment becomes longer, and the stability and speed of film feeding are reduced, which in turn affects the final production quality and qualified rate of soft bag infusion products.

[0005] The present invention is implemented as follows: a bag making device includes a film placing mechanism, a film feeding roller mechanism, a film pulling mechanism, a bag making welding area, a conveyor line and a nozzle welding mechanism. The film placing mechanism, the film feeding roller mechanism, the bag making welding area and the nozzle welding mechanism are arranged in sequence. The film pulling mechanism and the conveyor line are placed on the same side of the bag making welding area. The film pulling mechanism includes a film pulling head, a linear drive and an avoidance drive. The linear drive and the avoidance drive are used to drive the film pulling head to reciprocate at both ends of the bag making welding area.

[0006] The present invention adopts a film feeding method that combines a roller film feeding mechanism with a linear film pulling mechanism, and the roller film feeding mechanism is arranged between the film placing mechanism and the bag making and welding area. For the situation that multiple bags of soft bags need to be processed at one time, roller feeding is not only simpler than linear feeding, but also occupies less length space. At the same time, the film pulling mechanism and the conveying line are placed on the same side of the bag making and welding area, and the film pulling head reciprocates at both ends of the bag making and welding area, so that the film pulling mechanism has a short activity distance when pulling the film or avoiding, and has higher efficiency. Compared with the prior art, the present invention shortens the installation distance, and is particularly suitable for high-speed production of soft bag lines that process four bags, six bags, eight bags and other multiple bags at a time. If eight bags are produced, according to the structure of the prior art, the linear module for film feeding needs to occupy the length space of at least eight bag positions, while in the present invention, only the length space of the roller film feeding mechanism needs to be considered, and only the length space of less than two bag positions needs to be occupied, so as to avoid the problem that the longer the film feeding distance, the more likely it is to cause film falling failure and film feeding deviation, and avoid the problems of low stability and low qualified rate caused by the above problems. The invention has a simple and reliable structure and is particularly suitable for the production of higher-speed soft bag lines. It reduces the installation length space of the mechanism layout, occupies a smaller clean area for production, reduces the investment in clean workshops, and reduces the operating energy consumption cost.

[0007] A further technical solution of the present invention is: the linear drive is connected to the avoidance drive, the avoidance drive is connected to the film-pulling head, and the movement direction of the avoidance drive is perpendicular to the movement direction of the linear drive. The linear drive drives the film-pulling head to move through the avoidance drive, so that the film material is transported, and the avoidance drive can drive the film-pulling head to move toward the film material to pull the film material or drive the film-pulling head to move away from the film material to avoid the movement of the bag-making welding mechanism in the bag-making welding zone.

[0008] A further technical solution of the present invention is that the film pulling head is arranged horizontally and is consistent with the direction of movement of the avoidance drive. The film pulling head is arranged horizontally to clamp the film material from the front end of the film material, and the film pulling stability is higher; after the film pulling is completed, the avoidance drive drives the film pulling head to retreat and avoid, so as to avoid affecting the bag making process of the film material.

[0009] A further technical solution of the present invention is that the film-pulling mechanism further includes a film-pressing member, which is placed at the input end of the film-pulling mechanism. During the preliminary preparation, the film material is first pulled to the bottom of the film-pressing member and pressed, and then the film head is pulled to the set position to clamp the film material, and the film-pressing member is released at the same time, so as to ensure that the film material can be smoothly restricted at the set position.

[0010] A further technical solution of the present invention is that the film pulling mechanism is placed above the conveying line to save space.

[0011] A further technical solution of the present invention is: the roller film feeding mechanism comprises a driving roller and a driven roller arranged relatively to each other, the driving roller and the driven roller are used for film to pass through, the driving roller is connected to a rotary drive, and the driven roller is operable to adjust the distance between the driving roller and the driven roller. When the driving roller rotates, the driven roller is driven to rotate synchronously, so that the film material placed between the driving roller and the driven roller is pulled and transported, wherein the distance between the driven roller and the driving roller is adjustable, and after completing one film feeding, the excess supply film that may be generated by rolling the film before releasing, under the action of gravity of the film buffer assembly, the excess film material is returned, ready to enter the next film feeding cycle.

[0012] A further technical solution of the present invention is that the driven roller is connected to a lifting drive, and the lifting drive is connected to the driven roller to drive the driven roller to move up and down, thereby adjusting the distance between the driven roller and the driving roller.

[0013] A further technical solution of the present invention is that the bag making and welding area is provided with a mold that can be opened and closed up and down and a mold driving mechanism for driving the mold to move, and the mold driving mechanism is placed on the side away from the conveyor line. The mold driving mechanism drives the molds placed above and below the film material to open and close, thereby realizing bag making and welding of the film material. The mold driving mechanism is on the side away from the conveyor line, and the mold driving mechanism does not need to avoid when installing the pipe mouth, saving time. At the same time, when the film pulling mechanism avoids the bag making and welding mechanism in the bag making and welding area, the film pulling mechanism needs to move a shorter distance, further improving work efficiency.

[0014] A further technical solution of the present invention is that the film placing mechanism comprises a film disassembly component and a film buffer component, so as to ensure the stretching of the film material and assist in the smooth transportation of the film material.

[0015] The present invention also provides a bag making and filling system, including the bag making equipment, the conveyor line is a circulating conveyor line, and the conveyor line is sequentially provided with a pipe mouth welding mechanism, a waste edge cutting station, a bag transfer and reversing station, a filling station, a sealing station, and a bag output station.

[0016] The upper interface mechanism is arranged on the side of the conveyor line to place the tube mouth on the conveyor line. After passing through the bag making equipment, the tube mouth is installed in the bag body with an opening at one end, and then the tube mouth is welded to the bag body through the tube mouth welding mechanism in turn. The bag body is trimmed by the waste edge cutting mechanism on the waste edge cutting station, and then it passes through the bag transfer and reversing station, filling station, sealing station and bag output station in turn to complete bag making and filling to obtain a finished infusion bag.

[0017] The beneficial effects of the present invention are as follows: the present invention adopts a film feeding method combining a roller film feeding mechanism with a linear film pulling mechanism, and the roller film feeding mechanism is arranged between the film placing mechanism and the bag making and welding area. For the situation where multiple bags of soft bags need to be processed at one time, roller conveying is not only simpler than linear conveying, but also occupies less length space. At the same time, the film pulling mechanism and the conveying line are placed on the same side of the bag making and welding area, and the film pulling head reciprocates at both ends of the bag making and welding area, so that the film pulling mechanism has a short activity distance when pulling the film or avoiding, and has higher efficiency. Compared with the prior art, the present invention shortens the installation distance, and is particularly suitable for high-speed production of soft bag lines that process four bags, six bags, eight bags and other multiple bags at a time. If eight bags are produced, according to the structure of the prior art, the linear module for film feeding needs to occupy the length space of at least eight bag positions, while in the present invention, only the length space of the roller film feeding mechanism needs to be considered, and only the length space of less than two bag positions needs to be occupied, so as to avoid the problem that the longer the film feeding distance, the more likely it is to cause film falling failure and film feeding deviation, and avoid the problems of low stability and low qualified rate caused by the above problems. The invention has a simple and reliable structure and is particularly suitable for the production of higher-speed soft bag lines. It reduces the installation length space of the mechanism layout, occupies a smaller clean area for production, reduces the investment in clean workshops, and reduces the operating energy consumption cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a bag making and filling system provided by the present invention;

[0019] Figure 2 It is a structural schematic diagram of a bag making device provided by the present invention;

[0020] Figure 3 This is a front view of a bag making device provided by the present invention;

[0021] Figure 4 It is a structural schematic diagram of the film-drawing mechanism provided by the present invention before film drawing;

[0022] Figure 5 It is a structural schematic diagram of the film-drawing mechanism provided by the present invention after film drawing;

[0023] Figure 6 is a side view of the film pulling mechanism provided by the present invention;

[0024] Figure 7 It is a top view of a bag making device provided by the present invention.

[0025] Figure numerals: 1. film removal assembly, 2. film buffer assembly, 3. film cleaning mechanism, 4. printing mechanism, 5. front film opening knife, 6. roller film feeding mechanism, 7. rear film opening knife, 8. film pulling mechanism, 9. bag making and welding area, 10. conveyor line, 11. upper interface mechanism, 12. preheating mechanism, 13. nozzle welding mechanism, 801. film pulling head, 802. avoidance drive, 803. linear drive, 804. film pressing part, 601. driving roller, 602. driven roller, 603. lifting drive, 14. waste cutting station, 15. bag transfer and reversing station, 16. filling station, 17. sealing station, 18. bag discharging station, 19. waste discharge mechanism, 20. film material, 201. infusion bag, 21. nozzle. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0027] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0028] Embodiment 1:

[0029] Figure 1-7 A bag making device is shown, including a film placing mechanism, a film feeding roller mechanism 6, a film pulling mechanism 8, a bag making welding area 9, a conveyor line 10 and a nozzle welding mechanism 13. The film placing mechanism, the film feeding roller mechanism 6, the bag making welding area 9 and the nozzle welding mechanism 13 are arranged in sequence, and the film pulling mechanism 8 and the conveyor line 10 are placed on the same side of the bag making welding area 9. The film pulling mechanism 8 includes a film pulling head 801, a linear drive 803 and an avoidance drive 802. The linear drive 803 and the avoidance drive 802 are used to drive the film pulling head 801 to reciprocate at both ends of the bag making welding area 9.

[0030] In this embodiment, a film cleaning mechanism 3, a printing mechanism 4 and a front film opening knife 5 are sequentially arranged between the film placing mechanism and the roller film feeding mechanism 6; a rear film opening knife 7 is arranged between the roller film feeding mechanism 6 and the film pulling mechanism 8.

[0031] In this embodiment, the linear drive 803 is connected to the avoidance drive 802, the avoidance drive 802 is connected to the film drawing head 801, and the movement direction of the avoidance drive 802 is perpendicular to the movement direction of the linear drive 803. The linear drive drives the film drawing head to move through the avoidance drive, so that the film material is transported, and the avoidance drive can drive the film drawing head to move toward the film material to pull the film material or drive the film drawing head to move away from the film material to avoid the action of the bag making welding mechanism in the bag making welding area.

[0032] In this embodiment, the linear drive is used to drive the movement trajectory of the film pulling head to be consistent with the movement direction of the film material.

[0033] In this embodiment, the film pulling head 801 is horizontally arranged and has the same movement direction as the avoidance drive 802. The film pulling head is horizontally arranged to clamp the film material from the front end of the film material, and the film pulling stability is higher; after the film pulling is completed, the film pulling head is driven to retreat and avoid through the avoidance drive to avoid affecting the bag making process of the film material.

[0034] In this embodiment, the film pulling head is connected to an opening and closing drive so that the film pulling head can clamp the film material or release the film material.

[0035] In this embodiment, the film pulling head clamps the film material from one side of the film material along the width direction of the film material. When avoiding, the film pulling head needs to move a short distance, which saves the time of avoiding and improves the operation efficiency of the whole machine.

[0036] In this embodiment, the film-drawing mechanism 8 further includes a film-pressing member 804, and the film-pressing member 804 is placed at the input end of the film-drawing mechanism 8. In the early preparation, the film material is first pulled to the bottom of the film-pressing member and pressed, and then the film head is pulled to the set position to clamp the film material, and the film-pressing member is released at the same time to ensure that the film material can be smoothly restricted at the set position.

[0037] In this embodiment, the position of the film pressing member is fixed.

[0038] In this embodiment, the film pulling mechanism 8 is placed above the conveying line 10 to save space.

[0039] In this embodiment, the film-pulling head is placed below the avoidance drive, so that there is enough height between the film-pulling head and the linear drive for the pipe opening on the conveyor line to pass through, and the structures are compactly designed and will not interfere with each other.

[0040] In this embodiment, the roller film feeding mechanism 6 includes a driving roller 601 and a driven roller 602 that are arranged opposite to each other, wherein the driving roller 601 and the driven roller 602 are used for film to pass through, wherein the driving roller 601 is connected to a rotary drive, and wherein the driven roller 602 is operable to adjust the distance between the driving roller 601 and the driven roller. When the driving roller rotates, the driven roller is driven to rotate synchronously, so that the film material placed between the driving roller and the driven roller is pulled and transported, wherein the distance between the driven roller and the driving roller is adjustable, and after completing one film feeding, the excess film supply that may be generated by rolling the film before releasing it is returned under the gravity of the film buffer assembly, and the excess film material is prepared to enter the next film feeding cycle.

[0041] In this embodiment, the driving roller rotates counterclockwise, driving the driven roller to rotate clockwise.

[0042] In this embodiment, the driven roller 602 is connected to the lifting drive 603. The lifting drive is connected to the driven roller to drive the driven roller to move up and down, thereby adjusting the distance between the driven roller and the driving roller.

[0043] In this embodiment, the bag making and welding area 9 is provided with a mold that can be opened and closed up and down and a mold driving mechanism for driving the mold to move, and the mold driving mechanism is placed on the side away from the conveyor line 10. The mold driving mechanism drives the molds placed above and below the film material to open and close, thereby realizing the bag making and welding of the film material. The mold driving mechanism is on the side away from the conveyor line, and the mold driving mechanism does not need to avoid when installing the pipe mouth, saving time. At the same time, when the film pulling mechanism avoids the bag making and welding mechanism in the bag making and welding area, the film pulling mechanism needs to move a shorter distance, further improving work efficiency.

[0044] In this embodiment, the film placing mechanism includes a film disassembly component 1 and a film buffer component 2, which ensures the stretching of the film material and assists in the smooth transportation of the film material.

[0045] The working principle of the present invention: the present invention adopts a film feeding method that combines a roller film feeding mechanism with a linear film pulling mechanism, and the roller film feeding mechanism is arranged between the film placing mechanism and the bag making and welding area. For the situation where multiple bags of soft bags need to be processed at one time, roller conveying is not only simpler than linear conveying, but also occupies less length space. At the same time, the film pulling mechanism and the conveying line are placed on the same side of the bag making and welding area, and the film pulling head reciprocates at both ends of the bag making and welding area, so that the film pulling mechanism has a short activity distance when pulling the film or avoiding, and has higher efficiency; compared with the prior art, the present invention shortens the installation distance, and is particularly suitable for high-speed production of soft bag lines that process four bags, six bags, eight bags and other multiple bags at a time. If eight bags are produced, according to the structure of the prior art, the linear module for film feeding needs to occupy the length space of at least eight bag positions, while in the present invention, only the length space of the roller film feeding mechanism needs to be considered, and only the length space of less than two bag positions needs to be occupied, so as to avoid the problem that the longer the film feeding distance, the more likely it is to cause film falling failure and film feeding deviation, and avoid the problems of low stability and low qualified rate caused by the above problems. The invention has a simple and reliable structure and is particularly suitable for the production of higher-speed soft bag lines. It reduces the installation length space of the mechanism layout, occupies a smaller clean area for production, reduces the investment in clean workshops, and reduces the operating energy consumption cost.

[0046] Embodiment 2:

[0047] like Figure 1-7 A bag making and filling system shown includes the bag making equipment described in Example 1, wherein the conveyor line 10 is a circulating conveyor line, and the conveyor line 10 is provided with a pipe mouth welding mechanism 13, a waste edge cutting station 14, a bag transfer and reversing station 15, a filling station 16, a sealing station 17, and a bag output station 18 in sequence.

[0048] The upper interface mechanism is arranged on the side of the conveyor line to place the tube mouth on the conveyor line. After passing through the bag making equipment, the tube mouth is installed in the bag body with an opening at one end, and then the tube mouth is welded to the bag body through the tube mouth welding mechanism in turn. The bag body is trimmed by the waste edge cutting mechanism on the waste edge cutting station, and then it passes through the bag transfer and reversing station, filling station, sealing station and bag output station in turn to complete bag making and filling to obtain a finished infusion bag.

[0049] In this embodiment, the waste discharge mechanism 19 and the bag discharging station are respectively disposed on two sides of the conveying line 10 .

[0050] The working principle of the present invention is as follows: Figure 1-2 As shown, the structural plan layout diagram of soft bag making and filling, this embodiment takes a single synchronous belt ring transmission of six bags of bag making and six bags of filling as an example, the infusion film material 20 is placed on the film removal component 1, and the film is manually sent to the film pressing member 804 through the control of the film buffer component 2, completing the preparation before production operation; Figure 3As shown, during operation, the opened film-drawing head 801 moves forward to the upper and lower ends of the film material 20 under the action of the avoidance drive 802, and the film clamping mechanism 801 closes and clamps the infusion film material 20. After that, the film pressing piece 804 is released, and the roller film feeding mechanism 6 is actuated to open the film material 20 after the film cleaning device 3 and the printing mechanism 4 have been cleaned and printed through the front film opening knife 5, and the driving roller 601 rotates to drive the driven roller 602 to rotate, so that the film material 20 is transported forward, and at the same time, the linear drive 803 drives the film-drawing head 801 to transport forward synchronously, and the pulled film material 20 cooperates with the nozzle 21 synchronously transported by the conveying line 10, and the nozzle 21 is made to enter the middle of the opening of the film material 20 through the rear film opening knife 7. The nozzle 21 provides an upper interface mechanism to be placed on the conveying line 10, and after being preheated by the interface preheating mechanism 12 at least once, the nozzle 21 is usually preheated twice, and then it is synchronously transported to the middle of the film material 20; the film feeding position is as shown in FIG. Figure 4-7 As shown, after the film is sent, the mechanism on the bag-making welding area 9 is actuated to complete the welding of the nozzle 21 and the film material 20 and cut out the bag shape to complete the infusion bag 201; at this time, the film pressing member 804 is actuated to press the film material 20, the film pulling head 801 is opened, the avoidance mechanism 802 is retracted, and the linear drive 803 returns to the initial position, as shown in FIG. Figure 3 The position shown; after the film pressing member 804 presses the film material 20, the lifting drive 603 drives the driven roller 602 to move downward and then upward to press the film material 20 to the driving roller 601, releasing the excess supply film that may be generated by the previous rolling film feeding. Under the gravity of the film buffer component 2, the excess film material is returned to prepare for the next film feeding cycle. When the next film feeding cycle is in progress, the infusion bag 201 and the nozzle 21 are synchronously transported by the conveyor line 10 to the nozzle welding mechanism 13, the waste cutting station 14, the bag transfer reversing station 15, the filling station 16, the sealing station 17, and the bag discharge station 18 to complete the production of soft bag large infusion products. The waste bags generated by the filling and sealing can be output through the independently arranged waste discharge mechanism 19.

[0051] The present invention is also applicable to bag making and filling equipment with a virtual welding function.

[0052] The bag making and filling system of the present invention is also suitable for film feeding of a bag making and filling machine with double synchronous belts and annular transmission in which bag making and filling are transmitted separately.

[0053] In this embodiment, six bags of products are bagged and sealed at one time, but other quantities, such as four bags or eight bags, are also possible.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bag making device, characterized in that: The invention comprises a film placing mechanism, a film feeding roller mechanism (6), a film pulling mechanism (8), a bag making welding area (9), a conveying line (10) and a pipe mouth welding mechanism (13). The film placing mechanism, the film feeding roller mechanism (6), the bag making welding area (9) and the pipe mouth welding mechanism (13) are arranged in sequence. The film pulling mechanism (8) and the conveying line (10) are arranged on the same side of the bag making welding area (9). The film pulling mechanism (8) comprises a film pulling head (801), a linear drive (803) and an avoidance drive (802). The linear drive (803) and the avoidance drive (802) are used to drive the film pulling head (801) to reciprocate at both ends of the bag making welding area (9).

2. A bag making device according to claim 1, characterized in that: The linear drive (803) is connected to the avoidance drive (802), the avoidance drive (802) is connected to the film pulling head (801), and the movement direction of the avoidance drive (802) is perpendicular to the movement direction of the linear drive (803).

3. A bag making device according to claim 2, characterized in that: The pulling and touching head (801) is arranged horizontally and has the same movement direction as the avoidance drive (802).

4. The bag making equipment according to claim 1, characterized in that: The film-drawing mechanism (8) further comprises a film pressing member (804), and the film pressing member (804) is disposed at the input end of the film-drawing mechanism (8).

5. The bag making equipment according to claim 1, characterized in that: The film-drawing mechanism (8) is placed above the conveying line (10).

6. The bag making equipment according to claim 1, characterized in that: The roller film feeding mechanism (6) comprises a driving roller (601) and a driven roller (602) which are arranged opposite to each other. The driving roller (601) and the driven roller (602) are used for allowing the film to pass through. The driving roller (601) is connected to a rotary drive, and the driven roller (602) can be moved to adjust the distance between the driving roller (601).

7. A bag making device according to claim 6, characterized in that: The driven roller (602) is connected to the lifting drive (603).

8. The bag making equipment according to claim 1, characterized in that: The bag making and welding area (9) is provided with a mold that can be opened and closed up and down and a mold driving mechanism for driving the mold to move, and the mold driving mechanism is placed on a side away from the conveying line (10).

9. The bag making equipment according to claim 1, characterized in that: The film releasing mechanism comprises a film releasing component (1) and a film buffer component (2).

10. A bag-making and filling system, characterized in that: The bag making equipment comprises the bag making equipment as described in any one of claims 1 to 9, wherein the conveyor line (10) is a circulating conveyor line, and the conveyor line (10) is provided with a pipe mouth welding mechanism (13), a waste edge cutting station (14), a bag transfer reversing station (15), a filling station (16), a sealing station (17), and a bag discharging station (18) in sequence.

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