Conveying device and system adaptive to high-temperature engineering plastic extrusion pulling strip

Abstract

The utility model discloses a conveying device and system matched with a high-temperature engineering plastic extrusion traction strip, and the conveying device comprises a first frame, a second frame, a supporting main body, a first supporting baffle plate, a second supporting baffle plate, a roller mandrel, a roller, a lifting shifting piece and N shunting strips, one side of the supporting body is vertically fixed to the middle of the first frame, the other side of the supporting body is vertically fixed to the middle of the second frame, a base frame is provided for the conveying device, an opening is formed in the middle of the supporting body, and water flow resistance in the water tank is reduced. The first supporting baffle is fixed to the outer side of the first frame, and the second supporting baffle is fixed to the outer side of the second frame so that the conveying device can be erected on the water tank. And the immersion height of the material strip in the water tank is controlled by adjusting the distance between the lifting shifting piece and the supporting main body, so that the water content of the material strip is controlled. The conveying device disclosed by the utility model is made of stainless steel, so that the high-temperature engineering plastic extruded material strips can be conveyed smoothly, are not broken and are not blocked.

Description

Technical Field

[0001] This utility model belongs to the technical field of engineering plastic extrusion processing equipment, specifically relating to a conveying device and system adapted to high-temperature engineering plastic extrusion strands. Background Technology

[0002] Engineering plastics extrusion typically involves heating and melting plastic, then extruding it into N thin strips. These strips are then positioned and fed into a pelletizer via a cooling water tank and conveyor rollers. Traditional conveyor rollers have a relatively simple structure, generally consisting of a metal main frame with a single-shaft plastic roller with a concave groove. A cooling water tank is equipped with multiple roller supports. The roller support closest to the extruder head often has one end facing downwards to press the strip into the water, while the other roller supports at the rear are positioned with their rollers facing upwards above the water tank. The strip moves through the concave grooves of the rollers and into the pelletizer. Traditional rollers are generally made of plastic. When producing high-temperature plastics, the strip temperature is often high (above 280℃), and the high-temperature material is more rigid, especially high-glass fiber fillers, which often have surface fibers that easily adhere to the plastic rollers. This results in high friction between the strip and the plastic rollers, causing uneven strip transport, breakage, and reduced yield. Meanwhile, high-temperature materials crystallize quickly and have high rigidity. After being extruded from the extruder's diaphragm holes, the material strip cools rapidly and "solidifies" into a "wire-like" shape, lacking softness and elasticity. This causes the entire material strip to warp easily, resulting in poor contact with the water tank rollers and difficulty in guiding it into the pelletizer for granulation. Alternatively, the material strip may become "stiff" and prone to breakage, further reducing yield. In addition, traditional water tank rollers cannot flexibly control the height of the material strip immersed in water, thus failing to control the length of the material strip through the water. This often results in the material strip having a long water passage, leaving excessive water stains on its surface. Consequently, the granulated product is often accompanied by a large amount of water stains, severely affecting the product's moisture content.

[0003] Therefore, how to provide a conveying device adapted to high-temperature engineering plastic extrusion strands to control the water passage time of the strands, thereby reducing the moisture content of the strands and improving production efficiency, is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a conveying device and system adapted to high-temperature engineering plastic extrusion strands, so as to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides a conveying device adapted for high-temperature engineering plastic extrusion strands. The conveying device includes: a first frame, one end of which is provided with a plurality of first spherical positioning grooves at intervals; a second frame, one end of which is provided with a plurality of second spherical positioning grooves at intervals, wherein the first spherical positioning grooves and the second spherical positioning grooves correspond one-to-one; a support body, the support body having an opening in the middle; one side of the support body is vertically fixed to the middle of the first frame, and the other side of the support body is vertically fixed to the middle of the second frame; a first support baffle, the first support baffle being fixed to the outside of the first frame; and a second support baffle, the second support baffle being fixed to... The following components are located on the outer side of the second frame: a roller spindle, one end of which is fixed to the inner side of the first frame and the other end of which is fixed to the inner side of the second frame, and the roller spindle is located below the support body; a roller, which is sleeved on the outside of the roller spindle; a lifting lever, which has N through holes in the middle; one end of the lifting lever is detachably connected to the first spherical slot and the other end of the lifting lever is detachably connected to the second spherical slot; the lifting lever is located above the support body; and N diverter strips, one end of each diverter strip passing through a corresponding through hole and fixedly connected to the support body; where N is a positive integer.

[0006] As a further technical solution of this utility model, the conveying device further includes: a first telescopic positioner, one end of which is engaged with the first spherical locking groove, and the other end of which is fixedly connected to one end of the lifting lever; and a second telescopic positioner, one end of which is fixedly connected to the other end of the lifting lever, and the other end of which is engaged with the second spherical locking groove.

[0007] As a further technical solution of this utility model, the first telescopic positioning device includes a first spring and a first steel ball, one end of the first spring is fixedly connected to one end of the lifting lever, the other end of the first spring is fixedly connected to the first steel ball, and the first steel ball is engaged with the first spherical locking groove; the second telescopic positioning device includes a second spring and a second steel ball, one end of the second spring is fixedly connected to the other end of the lifting lever, the other end of the second spring is fixedly connected to the second steel ball, and the second steel ball is engaged with the second spherical locking groove.

[0008] As a further technical solution of this utility model, the roller is a hollow cylinder; the outer surface of the roller is provided with a number of concave grooves perpendicular to the outer surface, each of the concave grooves is parallel to each other, and the width of each concave groove is 1.5-2 times the diameter of the material strip.

[0009] A further technical solution of this utility model is that the diameter of each through hole is 1.2-1.5 times the diameter of the diverter strip.

[0010] As a further technical solution of this utility model, the length of each of the diversion strips is 6-10cm.

[0011] As a further technical solution of this utility model, the conveying device is made of stainless steel.

[0012] This utility model also provides a conveying system adapted to high-temperature engineering plastic extrusion strands. The conveying system includes a plurality of conveying devices adapted to high-temperature engineering plastic extrusion strands as described in the first aspect; the plurality of conveying devices are spaced apart between the extruder and the pelletizer, and the plurality of conveying devices are mounted on the water tank.

[0013] Beneficial effects:

[0014] This utility model provides a conveying device adapted for high-temperature engineering plastic extrusion strands, including a first frame, a second frame, a support body, a first support baffle, a second support baffle, a roller mandrel, rollers, lifting levers, and N diverter strips. One side of the support body is vertically fixed to the middle of the first frame, and the other side of the support body is vertically fixed to the middle of the second frame, providing a base frame for the conveying device. An opening is made in the middle of the support body to reduce water flow resistance in the tank. The first support baffle is fixed to the outside of the first frame, and the second support baffle is fixed to the outside of the second frame to mount the conveying device on the tank. One end of the roller mandrel is fixed to the inside of the first frame, and the other end of the roller mandrel is fixed to the inside of the second frame. The inner side of the two frames, with the roller spindle located below the support body, and the roller sleeve on the outside of the roller spindle, allows the material strip to directly generate friction with the roller, thereby driving the roller to rotate and promoting the forward conveying of the material strip; the lifting plate has N through holes in the middle, and one end of each diverter strip passes through a corresponding through hole and is fixedly connected to the support body. One end of the lifting plate is connected to the first spherical slot on the first frame, and the other end of the lifting plate is connected to the second spherical slot on the second frame. The connection position of the lifting plate with the slots of the first and second frames is adjusted according to the required water immersion time of the material strip, thereby controlling the immersion height of the material strip in the water tank, controlling the moisture content of the material strip, and thus improving production efficiency.

[0015] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of a conveying device adapted to high-temperature engineering plastic extrusion strands provided by this utility model;

[0018] Figure 2 A front view of a conveying device adapted to high-temperature engineering plastic extrusion strands provided by this utility model;

[0019] Figure 3 A top view of a conveying device adapted to high-temperature engineering plastic extrusion strands provided by this utility model;

[0020] Figure 4 A side view of a conveying device adapted to high-temperature engineering plastic extrusion strands provided by this utility model;

[0021] Figure 5 A schematic diagram of a conveying system adapted to high-temperature engineering plastic extrusion strands provided by this utility model;

[0022] Figure label:

[0023] 1. First frame; 2. Second frame; 3. Support body; 301. Opening; 4. First support baffle; 5. Second support baffle; 6. Roller spindle; 7. Roller; 701. Concave groove; 8. Lifting lever; 801. Through hole; 9. Diverter bar; 10. First telescopic positioner; 101. First spring; 102. First steel ball; 11. Second telescopic positioner; 111. Second spring; 112. Second steel ball; 12. Extruder; 13. Pelletizer; 14. Water tank. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. At the same time, the descriptions involving "first", "second", etc. in the present utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of those features. In addition, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present utility model.

[0025] Example 1

[0026] Please see Figure 1-4 This embodiment provides a conveying device adapted for high-temperature engineering plastic extrusion strands. The conveying device includes: a first frame 1, with a plurality of first spherical slots spaced apart at one end; a second frame 2, with a plurality of second spherical slots spaced apart at one end, the first and second spherical slots corresponding one-to-one; a support body 3, with an opening 301 in the middle; one side of the support body 3 is vertically fixed to the middle of the first frame 1, and the other side is vertically fixed to the middle of the second frame 2; a first support baffle 4, fixed to the outside of the first frame 1; and a second support baffle, fixed to the second frame 2. The outer side; roller spindle 6, one end of which is fixed to the inner side of the first frame 1, and the other end of which is fixed to the inner side of the second frame 2, and the roller spindle 6 is located below the support body 3; roller 7, which is sleeved on the outside of the roller spindle 6; lifting lever 8, which has N through holes 801 in the middle; one end of the lifting lever 8 is detachably connected to the first spherical slot, and the other end of the lifting lever 8 is detachably connected to the second spherical slot; the lifting lever 8 is located above the support body 3; N diverter strips 9, one end of each diverter strip 9 passes through a corresponding through hole 801 and is fixedly connected to the support body 3; where N is a positive integer.

[0027] Specifically, this utility model provides a conveying device adapted for high-temperature engineering plastic extrusion strands, including a first frame 1, a second frame 2, a support body 3, a first support baffle 4, a second support baffle, a roller spindle 6, rollers 7, lifting levers 8, and N diverter bars 9. One side of the support body 3 is vertically fixed to the middle of the first frame 1, and the other side of the support body 3 is vertically fixed to the middle of the second frame 2, providing a base frame for the conveying device. An opening 301 is opened in the middle of the support body 3 to reduce water flow resistance in the water tank 14. The first support baffle 4 is fixed to the outside of the first frame 1, and the second support baffle is fixed to the outside of the second frame 2, so that the conveying device can be mounted on the water tank 14. One end of the roller spindle 6 is fixed to the inside of the first frame 1, and the other end of the roller spindle 6 is fixed to the outside of the second frame 2. The roller 7 is positioned inside the second frame 2, with the roller spindle 6 located below the support body 3. The roller 7 is sleeved on the outside of the roller spindle 6, allowing the material strip to directly generate friction with the roller 7, thereby driving the roller 7 to rotate and promoting the forward conveying of the material strip. The lifting plate 8 has N through holes 801 in the middle, and one end of each diverter 9 passes through a corresponding through hole 801 and is fixedly connected to the support body 3. One end of the lifting plate 8 is connected to the first spherical slot on the first frame 1, and the other end of the lifting plate 8 is connected to the second spherical slot on the second frame 2. The connection position of the lifting plate 8 with the slots of the first frame 1 and the second frame 2 is adjusted according to the required water immersion time of the material strip, thereby controlling the immersion height of the material strip in the water tank 14, controlling the moisture content of the material strip, and thus improving production efficiency.

[0028] It should be added that, in order to improve the contact stability between the first support baffle 4 and the second support baffle and the water tank 14, the first support baffle 4 and the second support baffle are designed as a "T" shaped structure. The first support baffle 4 includes a first horizontal plate and a first vertical plate. The first vertical plate is attached to and fixed to the outside of the first frame 1, and the first horizontal plate is vertically fixed to the middle of the first vertical plate. The first horizontal plate and the first vertical plate directly form an installation groove to be mounted on the water tank 14. Similarly, the second support baffle includes a second horizontal plate and a second vertical plate. The second vertical plate is attached to and fixed to the outside of the second frame 2, and the second horizontal plate is vertically fixed to the middle of the second vertical plate.

[0029] In some possible implementations, the conveying device further includes: a first telescopic positioner 10, one end of which is engaged with the first spherical locking groove, and the other end of which is fixedly connected to one end of the lifting lever 8; and a second telescopic positioner 11, one end of which is fixedly connected to the other end of the lifting lever 8, and the other end of which is engaged with the second spherical locking groove.

[0030] Specifically, by connecting the lifting lever 8 and the first spherical slot through the first telescopic positioner 10, and the second telescopic positioner 11 connecting the lifting lever 8 and the second spherical slot, the distance between the lifting lever 8 and the support body 3 can be adjusted through the first telescopic positioner 10 and the second telescopic positioner 11, thereby adjusting the immersion height of the extruded strip in the water tank 14, controlling the moisture content of the extruded strip, so that the extruded strip maintains a certain temperature before entering the pelletizer 13, and uses the high material temperature to evaporate the water vapor on the surface of the strip, reducing the need for subsequent additional drying processes.

[0031] In some possible implementations, the first telescopic positioning device 10 includes a first spring 101 and a first steel ball 102. One end of the first spring 101 is fixedly connected to one end of the lifting lever 8, and the other end of the first spring 101 is fixedly connected to the first steel ball 102. The first steel ball 102 engages with the first spherical locking groove. The second telescopic positioning device 11 includes a second spring 111 and a second steel ball 112. One end of the second spring 111 is fixedly connected to the other end of the lifting lever 8, and the other end of the second spring 111 is fixedly connected to the second steel ball 112. The second steel ball 112 engages with the second spherical locking groove.

[0032] Those skilled in the art will understand that the first telescopic positioning device 10 includes a first spring 101 and a first steel ball 102. One end of the first spring 101 is fixedly connected to one end of the lifting lever 8, and the other end of the first spring 101 is fixedly connected to the first steel ball 102. The elastic force of the first spring 101 causes the first steel ball 102 to engage in a corresponding first spherical slot. Similarly, the second spring 111 causes the second steel ball 112 to engage in a corresponding second spherical slot, thereby determining the relative position of the lifting lever 8 with the first frame 1 and the second frame 2.

[0033] In some possible implementations, the roller 7 is a hollow cylinder; the outer surface of the roller 7 is provided with a plurality of concave grooves 701 perpendicular to the outer surface, each of the concave grooves 701 being parallel to each other, and the width of each concave groove 701 being 1.5-2 times the diameter of the material strip.

[0034] This is because several concave grooves 701 perpendicular to the outer surface are provided on the outer surface of the roller 7, so that the extrusion strip coming out of the previous diverter 9 is transported to the next diverter 9 through the concave grooves 701. At the same time, the inner and outer surfaces of the roller 7 are polished, as are the roller spindle 6, thereby reducing the friction when the roller 7 rotates.

[0035] In some possible implementations, the diameter of each of the through holes 801 is 1.2 to 1.5 times the diameter of the diverter strip 9.

[0036] In some possible implementations, the length of each of the diversion strips 9 is 6-10 cm.

[0037] Those skilled in the art will understand that the diameter of each through hole 801 is 1.2-1.5 times the diameter of the diverter strip 9, and the length of each diverter strip 9 is 6-10cm. The diverter strips 9 are arranged in parallel in a "comb" shape, so that the extrusion strip passes through the gap between two adjacent diverter strips 9, which guides the extruded material strip. At the same time, the diverter strips 9 are polished to reduce the friction between the diverter strips 9 and the extruded material strip.

[0038] In some possible implementations, the conveying device is made of stainless steel.

[0039] In this application, the conveying devices are all made of stainless steel, and the key components, rollers 7, roller spindles 6 and diverter bars 9, are polished, which not only reduces friction and improves production efficiency, but also extends service life.

[0040] Example 2:

[0041] Please see Figure 5 Embodiment 2 of this utility model provides a conveying system adapted to high-temperature engineering plastic extrusion strands. The conveying system includes a plurality of conveying devices adapted to high-temperature engineering plastic extrusion strands as described in the first aspect; the plurality of conveying devices are spaced apart between the extruder 12 and the pelletizer 13, and the plurality of conveying devices are mounted on the water tank 14.

[0042] Specifically, the present invention provides a conveying system for high-temperature engineering plastic extrusion strips, comprising several conveying devices as described in the embodiments, which are arranged between the extruder 12 and the pelletizer 13 along the conveying direction of the extruded strip. The conveying devices are arranged alternately in the following manner: first, the roller is on top and the diverter 9 is below; then, the roller is below and the diverter 9 is on top. The number of conveying devices is determined by the conveying situation of the strip. This allows the hardened strip that has left the cooling water to advance along the metal roller 7. A certain friction is generated between the roller 7 and the strip, which drives the roller 7 to rotate, further promoting the advancement of the strip. When the strip passes through the metal diverter 9, the "comb"-like arrangement separates the strips independently. The metal diverter 9 is hard and heat-resistant, and will not stick to the high-temperature strip. In particular, the surface of the high glass fiber reinforced material strip is rough. After using the diverter 9, the strip will not break due to excessive frictional resistance. At the same time, the alternating use of multiple multi-functional rollers 7 can effectively anchor and guide the hardened material strip, allowing the material strip to smoothly enter the pelletizer 13 for granulation, greatly improving the extrusion yield.

[0043] Since Embodiment 2 and Embodiment 1 are embodiments under the same inventive concept and have some identical structures, the structures in Embodiment 2 that are substantially the same as those in Embodiment 1 will not be described in detail. For the parts not described in detail, please refer to Embodiment 1.

[0044] The working principle of this invention is as follows: Several conveying devices are placed between the extruder and the pelletizer. These devices are arranged alternately, upside down. A conveying device with the first roller on top and the distributor strip below is placed near the extruder outlet. This device is supported by a first and a second support baffle on a water tank. The "comb"-shaped distributor strip presses the molten, soft, and elastic extruded material into the water tank for cooling. The height of the lifting paddle can be adjusted by adjusting the first and second telescopic positioners, thereby adjusting the immersion height of the extruded material in the water tank. The length and temperature of the extruded strip are adjusted to reduce water stains on its surface. Then, along the direction of the extruded strip conveying, a second conveying device with a splitter bar on top and rollers on top is placed, so that the extruded strip from the splitter bar in the first conveying device enters the rollers in the second conveying device. The friction between the rollers and the extruded strip drives the rollers to rotate, and then the extruded strip is conveyed to a third conveying device with rollers on top and splitter bars below. The number of conveying devices is determined according to the conveying situation of the extruded strip, so that the extruded strip smoothly enters the pelletizer for granulation, thereby improving the extrusion yield.

[0045] In summary, the conveying device and system provided by this utility model for high-temperature engineering plastic extrusion strands can ensure smooth, unbroken, and uninterrupted conveying of high-temperature engineering plastic extrusion strands, thereby improving productivity. At the same time, by controlling the water-washing time of the strands, it ensures that the strands maintain a certain temperature before entering the pelletizer, and utilizes the high material temperature to evaporate the water vapor on the surface of the strands, reducing the need for subsequent additional drying processes. It is environmentally friendly, energy-saving, and easy to operate.

[0046] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. All should be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

[0047] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A conveying device adapted for high-temperature engineering plastic extrusion strands, characterized in that, The conveying device includes: A first frame, wherein a plurality of first spherical slots are provided at intervals at one end of the first frame; The second frame has a plurality of second spherical slots spaced at one end, and the first spherical slots and the second spherical slots correspond one-to-one; A support body has an opening in the middle; one side of the support body is vertically fixed to the middle of the first frame, and the other side of the support body is vertically fixed to the middle of the second frame. A first support baffle is fixed to the outside of the first frame; The second support baffle is fixed to the outside of the second frame. A roller spindle, one end of which is fixed to the inner side of the first frame, and the other end of which is fixed to the inner side of the second frame, and the roller spindle is located below the support body; A roller, which is sleeved on the outside of the roller spindle; A lifting lever has N through holes in the middle; one end of the lifting lever is detachably connected to the first spherical locking groove, and the other end of the lifting lever is detachably connected to the second spherical locking groove; the lifting lever is located above the support body. N diversion strips, one end of each diversion strip passes through a corresponding through hole and is fixedly connected to the support body; Where N is a positive integer.

2. The conveying device for high-temperature engineering plastic extrusion strands as described in claim 1, characterized in that, The conveying device also includes; The first telescopic positioning device has one end engaged with the first spherical locking groove, and the other end fixedly connected to one end of the lifting lever. The second telescopic positioner has one end fixedly connected to the other end of the lifting lever, and the other end of the second telescopic positioner is engaged with the second spherical locking groove.

3. The conveying device for high-temperature engineering plastic extrusion strands as described in claim 2, characterized in that, The first telescopic positioning device includes a first spring and a first steel ball. One end of the first spring is fixedly connected to one end of the lifting lever, and the other end of the first spring is fixedly connected to the first steel ball. The first steel ball is engaged with the first spherical locking groove. The second telescopic positioner includes a second spring and a second steel ball. One end of the second spring is fixedly connected to the other end of the lifting lever, and the other end of the second spring is fixedly connected to the second steel ball. The second steel ball engages with the second spherical locking groove.

4. The conveying device for high-temperature engineering plastic extrusion strands as described in claim 1, characterized in that, The roller is a hollow cylinder; the outer surface of the roller is provided with a number of concave grooves perpendicular to the outer surface, each of the concave grooves is parallel to each other, and the width of each concave groove is 1.5-2 times the diameter of the material strip.

5. The conveying device for high-temperature engineering plastic extrusion strands as described in claim 1, characterized in that, The diameter of each of the through holes is 1.2 to 1.5 times the diameter of the diverter strip.

6. The conveying device for high-temperature engineering plastic extrusion strands as described in claim 1, characterized in that... Each of the diversion strips is 6-10 cm long.

7. The conveying device for high-temperature engineering plastic extrusion strands as described in claim 1, characterized in that, The conveying device is made of stainless steel.

8. A conveying system adapted for high-temperature engineering plastic extrusion strands, characterized in that, The conveying system includes several conveying devices adapted for high-temperature engineering plastic extrusion strands as described in any one of claims 1-7; several of the conveying devices are spaced apart between the extruder and the pelletizer, and several of the conveying devices are mounted on a water tank.

Images