Quick-freezing and boxing equipment for aquatic products

Abstract

The invention relates to the technical field of packaging equipment, and discloses aquatic product quick-freezing and boxing equipment which comprises a conveying frame, a positioning frame arranged on the outer side of the conveying frame, a conveying frame and a feeding box, the conveying frame and the feeding box are located in the positioning frame, a plurality of conveying rollers are installed in the conveying frame, and the surfaces of the conveying rollers are sleeved with plastic pipes; a pair of positioning plates is movably clamped at the top end of the conveying frame, the distance between the positioning plates can be adjusted, the positioning frame is rectangular and installed on the outer wall of the conveying frame, a pair of sliding grooves are formed in the positioning frame, a lifting frame is movably clamped between the sliding grooves, and the conveying frame is installed at the top end of the lifting frame and used for conveying plastic package bags into a storage box. A pair of arc-shaped telescopic rods is installed at one end of the conveying frame. The feeding box is installed at one ends of the arc-shaped telescopic rods. Compared with the prior art, the plastic packaging bag has the advantages that the plastic packaging bag can be shaped in the transportation process of aquatic products packaged by the plastic packaging bag, so that the plastic packaging bag is in a plate shape with uniform size, subsequent storage and transportation are facilitated, and the condition of collision in the transportation process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of packaging equipment, in particular to a kind of aquatic product quick-freezing packaging equipment. Background Art

[0002] Freezing of aquatic products refers to a low-temperature preservation method that uses low temperature conditions to inhibit the activity of autolytic enzymes in aquatic products and the reproduction of attached microorganisms, and slows down the rate of chemical reactions such as lipid oxidation and non-enzymatic browning, so that the quality of the aquatic products can be maintained during storage. Freezing of aquatic products generally includes two methods: refrigerated preservation and frozen preservation. The frozen preservation method mainly involves quick freezing of aquatic products through freezing equipment.

[0003] Aquatic products are generally quickly frozen after being packaged in plastic and evenly stacked in storage boxes for subsequent transportation. When packing, they should be stacked reasonably according to the shape and size of the products to ensure that the products will not squeeze and deform each other. For example, aquatic products such as small fish and shrimp will be quickly frozen together with water in the plastic packaging to reduce the possibility of damage to the internal aquatic products due to bumps during subsequent transportation. However, since the internal deformation of the plastic packaging is prone to inconsistency after freezing, it is not convenient to take and stack. For this reason, we propose a quick-freezing and packing equipment for aquatic products to solve the above problem. Summary of the invention

[0004] The object of the present invention is to provide a kind of aquatic product quick-freezing packing equipment, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a kind of aquatic product quick-frozen packing equipment, comprising a transmission frame, a positioning frame arranged outside the transmission frame, and a conveying frame and a loading box located inside the positioning frame, a plurality of transmission rollers are installed inside the transmission frame, a plastic tube is sleeved on the surface of the transmission roller, a pair of positioning plates are movably provided at the top of the transmission frame, the spacing between the positioning plates can be adjusted, and the positioning frame is rectangular and is installed on the outer wall of the transmission frame;

[0006] A pair of slide grooves are provided inside the positioning frame, and a lifting frame is movably provided between the slide grooves, the conveying frame is installed on the top of the lifting frame, the conveying frame is used to convey the plastic bags to the storage box, and a pair of arc-shaped telescopic rods are installed at one end of the conveying frame, and the loading box is installed at one end of the arc-shaped telescopic rods. When the quick-frozen products need to be packed, the plastic bags mixed with fish, shrimp and water can be refrigerated. When the inside of the bags is in a state of ice-water mixture, they can be laid inside the loading box to assist in sorting, and the plastic bags inside the loading box can be transported along the conveying frame to the storage box for packaging and transportation. The plastic bags can be leveled during the transmission process, and the plastic bags can be evenly stacked inside the storage box with the help of the rectangular frame.

[0007] Preferably, a straight groove is provided on one side of the feeding box, and a positioning shaft is installed inside the straight groove, a pair of limit baffles are movably clamped at the bottom of the positioning shaft, a limit bolt is provided at the top end of the positioning shaft, a bolt hole is provided at the top of the limit baffle, and the limit bolt is used to adjust the spacing of the limit baffles;

[0008] A limiting pressure plate is installed on one side of the feeding box, and the limiting pressure plate is located between the limiting baffles. The limiting pressure plate is "U"-shaped and the middle section is elastic. A pair of telescopic rods are installed on the inner wall of the limiting pressure plate, and one end of the telescopic rod is clamped on the inner wall of the feeding box. The limiting pressure plate and the limiting baffle can play a limiting role, and the packaged plastic bags can be clamped inside the feeding box.

[0009] Preferably, a control motor is installed at the bottom of the feeding box, and a pushing plate is installed on the output end of the control motor, and the pushing plate passes through the bottom of the feeding box. A condenser is provided in the inner wall of the feeding box to maintain the temperature of the aquatic product. The condenser can maintain low temperature, and the pushing plate can move the plastic bags one by one to the inside of the conveying rack.

[0010] Preferably, the side of the conveying frame away from the loading box is inclined, and a pair of support frames are installed on the conveying frame. The support frames are symmetrically arranged, and blocking plates are installed on the top of the support frames on both sides. The blocking plates are arranged parallel to the inclined side of the conveying frame, and a channel for transmitting plastic bags is formed between the bottom of the blocking plate and the inclined side of the conveying frame, which can play a conveying role.

[0011] Preferably, a plurality of limit plates are installed at the bottom of the blocking plate, and the limit plates are arranged around the blocking plate. A storage rack is fixedly connected to the bottom of the limit plate. A rotating shaft is provided inside the storage rack for rotation. Compression spring plates are installed on the rotating shaft. The compression spring plates at both ends are symmetrically arranged. A positioning pressure plate is installed between the compression spring plates. The positioning pressure plate can be used to knock and flatten the plastic bags during the transmission process to prevent the surface from being uneven, which can reduce the difficulty in separating the plastic bags after subsequent quick freezing.

[0012] Preferably, multiple compression rings are installed at both ends of the positioning pressure plate, and the compression rings are made of elastic material. A toggle rod is fixedly connected between the compression rings, and a metal shaft is fixedly connected to the toggle rod, which is used for leveling. During the leveling process, the solid materials such as fish and shrimp inside can be evenly laid and distributed, and the subsequent thawing efficiency can also be effectively improved.

[0013] Preferably, a circular groove is provided on the storage rack, and a transmission shaft is inserted into the circular groove, the transmission shaft is clamped inside the rotating shaft, a fixing frame is fixedly connected to the transmission shaft, the angle of the fixing frame can be adjusted following the rotation of the transmission shaft, the bottom of the fixing frame is abutted against the top of the conveying rack, a conveying baffle is installed on the fixing frame, the conveying baffle is elastic, and can contact the conveying baffle to limit the plastic packaging bag during the transmission process to prevent deviation and jamming during transportation.

[0014] Preferably, a card slot is provided at the bottom of the conveying frame, and a rectangular frame is installed inside the card slot, a plurality of rubber blocks are fixed inside the rectangular frame, the spacing inside the rectangular frame can be adjusted, a plurality of elastic baffles are installed at the outer end of the rectangular frame, a plastic gasket is provided on the surface of the elastic baffle, and the elastic gasket can be pressed against one side of the stacked plastic bags to serve as auxiliary support.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. During the transmission process, the present invention can adjust the angle of the transmission shaft according to the plastic-sealed bags of different sizes, and can make the conveying baffles against the two sides of the plastic-sealed bags. During the transmission process, the plastic-sealed bags can move left and right and collide with the conveying baffles, so that the transmission shaft moves under the action of external force, controls the rotation of the rotating shaft, and can pull the compression spring plate to move, thereby squeezing and knocking the surface of the plastic-sealed bags, adjusting the ice-water mixture inside, and playing a leveling role;

[0017] 2. The present invention can adapt to plastic bags of different sizes by adjusting the position of the limit baffle. At the same time, under the action of the limit pressure plate, the plastic bags can be stacked inside the loading box. At the same time, under the action of the condenser, the temperature inside the loading box is controlled, so that the inside of the plastic bags can be in a state of ice-water mixture, and can be pushed to the inside of the conveyor frame for transmission under the action of the push plate;

[0018] 3. The present invention squeezes the surface of the plastic bag by the positioning pressing plate, and under the action of the compression ring, the metal shaft on the surface of the toggle rod can continuously knock and level the surface of the plastic bag, thereby reducing the unevenness after quick freezing, which can facilitate subsequent stacking and stacking, and also facilitate subsequent thawing and separation;

[0019] 4. During the stacking process, the present invention can make the plastic bags fall into the storage box along the rectangular frame, and the conveying speed is slowed down by rubber blocks. When the plastic bags are vertically stacked in the storage box, the lifting frame can move upward and then quickly reset. At the same time, the transmission roller can move to press the elastic baffle against one side of the plastic bags, so that the plastic bags can be evenly laid in the storage box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the positioning frame structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 A partial enlarged schematic diagram in the middle;

[0023] Figure 4 This is a schematic diagram of the disassembly structure of the conveyor frame of the present invention;

[0024] Figure 5 For the present invention Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0025] Figure 6 It is a schematic diagram of the local structure of the baffle plate of the present invention;

[0026] Figure 7 It is a schematic diagram of the rectangular frame structure of the present invention;

[0027] In the figure: 1. transmission frame; 2. positioning frame; 3. loading box; 4. conveying frame; 5. rectangular frame; 11. positioning plate; 12. transmission roller; 21. lifting frame; 31. positioning shaft; 32. limiting baffle; 33. pushing plate; 34. limiting pressure plate; 41. blocking plate; 42. supporting frame; 43. limiting plate; 431. storage frame; 44. rotating shaft; 45. compression spring plate; 46. transmission shaft; 47. fixing frame; 471. conveying baffle; 48. positioning pressure plate; 481. compression ring; 51. elastic baffle. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 7 The present invention provides a technical solution: a quick-frozen packing equipment for aquatic products, comprising a transmission frame 1, a positioning frame 2 arranged outside the transmission frame 1, and a conveying frame 4 and a loading box 3 located inside the positioning frame 2, a plurality of transmission rollers 12 are installed inside the transmission frame 1, and a plastic tube is sleeved on the surface of the transmission roller 12, a pair of positioning plates 11 are movably provided on the top of the transmission frame 1, and the spacing between the positioning plates 11 can be adjusted, and the positioning frame 2 is rectangular and installed on the outer wall of the transmission frame 1;

[0030] A pair of slide grooves are provided inside the positioning frame 2, and a lifting frame 21 is movably provided between the slide grooves. The conveying frame 4 is installed at the top of the lifting frame 21. The conveying frame 4 is used to convey the plastic bags to the storage box. A pair of arc-shaped telescopic rods are installed at one end of the conveying frame 4, and the loading box 3 is installed at one end of the arc-shaped telescopic rods. When the quick-frozen products need to be packed, the plastic bags mixed with fish, shrimp and water can be refrigerated. When the inside of the bags is in a state of ice-water mixture, they can be laid inside the loading box 3 to assist in sorting. The plastic bags inside the loading box 3 can be transported along the conveying frame 4 to the inside of the storage box for packaging and transportation. The plastic bags can be leveled during the transmission process, and the plastic bags can be evenly stacked inside the storage box with the help of the rectangular frame 5.

[0031] like Figure 2 As shown, in order to facilitate the feeding and limiting of plastic packaging bags of different sizes, a straight groove is opened on one side of the feeding box 3, and a positioning shaft 31 is installed inside the straight groove. A pair of limiting baffles 32 are movably clamped at the bottom of the positioning shaft 31, and a limiting bolt is provided at the top of the positioning shaft 31. A bolt hole is provided on the top of the limiting baffle 32, and the limiting bolt is used to adjust the spacing of the limiting baffle 32;

[0032] A limiting pressure plate 34 is installed on one side of the feeding box 3, and the limiting pressure plate 34 is located between the limiting baffles 32. The limiting pressure plate 34 is "U"-shaped and the middle section is elastic. A pair of telescopic rods are installed on the inner wall of the limiting pressure plate 34, and one end of the telescopic rod is clamped on the inner wall of the feeding box 3. The position of the limiting baffle 32 can be adjusted according to actual conditions, and the limiting bolts are used for positioning. The limiting pressure plate 34 can be against the top of the plastic bag under the action of the telescopic rod, which can play an auxiliary limiting role.

[0033] like Figure 3 As shown, in order to avoid unexpected thawing during the subsequent transportation process, a control motor is installed at the bottom of the feeding box 3, and a pushing plate 33 is installed on the output end of the control motor. The pushing plate 33 runs through the bottom of the feeding box 3. A condenser is provided in the inner wall of the feeding box 3 to maintain the temperature of the aquatic product. The condenser can be used to maintain the temperature and prevent the internal ice-water mixture from turning into water during the transportation process, so as to facilitate extrusion and leveling during the subsequent transportation process.

[0034] like Figure 4As shown, in order to ensure the stability of transportation, the side of the conveying frame 4 away from the loading box 3 is inclined, and a pair of support frames 42 are installed on the conveying frame 4. The support frames 42 are symmetrically arranged, and blocking plates 41 are installed on the top of the support frames 42 on both sides. The blocking plates 41 are arranged parallel to the inclined side of the conveying frame 4, and a channel for plastic bag transmission is formed between the bottom of the blocking plate 41 and the inclined side of the conveying frame 4. Pads can be added to the bottom of the support frames 42 for adjustment according to plastic bags of different sizes, thereby ensuring the stability of transportation and leveling and reducing unexpected situations of jamming during operation.

[0035] like Figure 5 As shown, the surface of the plastic packaging will be deformed due to extrusion during the condensation process, resulting in uneven stacking of the plastic packaging bags. A plurality of limit plates 43 are installed at the bottom of the blocking plate 41. The limit plates 43 are arranged around the blocking plate 41. A storage rack 431 is fixedly connected to the bottom of the limit plate 43. A rotating shaft 44 is arranged inside the storage rack 431 for rotation. Compression spring plates 45 are installed on the rotating shaft 44. The compression spring plates 45 at both ends are symmetrically arranged. A positioning pressure plate 48 is installed between the compression spring plates 45. As the compression spring plates 45 move, the positioning pressure plate 48 can be pulled to move, so that the surface of the plastic packaging bags during transportation can be continuously knocked and squeezed. The inside of the plastic packaging bags is in a state of ice-water mixture, which can be quickly leveled and adjusted, so as to facilitate subsequent collection into the storage box for fast stacking.

[0036] like Figure 6 As shown, in order to avoid the accidental accumulation of fish and shrimp inside the plastic bag at one end of the plastic bag, multiple compression rings 481 are installed at both ends of the positioning pressure plate 48. The compression rings 481 are made of elastic material. A toggle rod is fixedly connected between the compression rings 481, and a metal shaft is fixedly connected to the toggle rod for leveling. The toggle rod between the compression rings 481 can knock on the surface of the plastic bag, and under the action of the metal shaft, the fish and shrimp in the ice-water mixture can be pushed and distributed, so that they are distributed as evenly as possible in the ice-water mixture, so that the fish and shrimp are in a relatively complete state after subsequent thawing.

[0037] like Figure 5As shown, in order to ensure that the plastic-sealed bags will not get stuck or deviated during transportation, a circular groove is provided on the storage rack 431, and a transmission shaft 46 is inserted inside the circular groove. The transmission shaft 46 is clamped inside the rotating shaft 44, and a fixing frame 47 is fixedly connected to the transmission shaft 46. The angle of the fixing frame 47 can be adjusted as the transmission shaft 46 rotates. The bottom of the fixing frame 47 is abutted against the top of the conveying rack 4, and a conveying baffle 471 is installed on the fixing frame 47. The conveying baffle 471 is elastic. During the transmission process, the plastic-sealed bags can move left and right and collide with the conveying baffle 471, so that the transmission shaft 46 can move under the action of external force, and the rotation of the rotating shaft 44 can be controlled to pull the compression spring plate 45 to move, thereby squeezing and knocking the surface of the plastic-sealed bags. The squeezing and knocking during the transportation process can keep the overall shape of the plastic-sealed bags consistent, which is convenient for subsequent stacking.

[0038] like Figure 7 As shown, a card slot is provided at the bottom of the conveying frame 4, and a rectangular frame 5 is installed inside the card slot. A plurality of rubber blocks are arranged inside the rectangular frame 5, and the spacing inside the rectangular frame 5 can be adjusted. A plurality of elastic baffles 51 are installed at the outer end of the rectangular frame 5, and a plastic gasket is provided on the surface of the elastic baffle 51. During the stacking process, the plastic-sealed bags can fall into the storage box along the rectangular frame 5. The rubber blocks on the inside of the rectangular frame 5 can slow down the conveying speed, and when the plastic-sealed bags are vertically stacked inside the storage box, the lifting frame 21 can move upward and then quickly reset. At the same time, the transmission roller 12 is movable to press the elastic baffle 51 against one side of the plastic-sealed bag, so that the plastic-sealed bags can be evenly laid inside the storage box.

[0039] Working principle: first, when it is necessary to pack the quick-frozen products, the plastic-sealed bags mixed with fish, shrimp and water can be refrigerated. When the inside of the plastic-sealed bags is in the state of an ice-water mixture, the plastic-sealed bags can be laid inside the loading box 3 to assist in sorting, and the plastic-sealed bags inside the loading box 3 can be transported along the conveying frame 4 to the storage box for packaging and transportation. During the transportation process, the plastic-sealed bags can be leveled, and the plastic-sealed bags can be evenly stacked inside the storage box under the action of the rectangular frame 5. When the plastic-sealed bags are stacked inside the loading box 3, the position of the limiting baffle 32 can be adjusted to accommodate plastic-sealed bags of different sizes. At the same time, under the action of the limiting pressure plate 34, the plastic-sealed bags can be stacked inside the loading box 3. At the same time, under the action of the condenser, the temperature inside the loading box 3 can be controlled, so that the inside of the plastic-sealed bags can be in the state of an ice-water mixture. As the arc-shaped telescopic rod and the pushing plate 33 start to operate, the plastic-sealed bags can be pushed between the conveying frame 4 and the blocking plate 41.

[0040] Then, during the transmission process, the angle of the transmission shaft 46 can be adjusted according to the plastic bags of different sizes, so that the conveying baffle 471 can be pressed against the two sides of the plastic bags, and during the transmission process, the plastic bags can move left and right and collide with the conveying baffle 471, so that the transmission shaft 46 can move under the action of external force, and the rotation of the rotating shaft 44 can be controlled to pull the compression spring plate 45 to move, so as to squeeze and knock the surface of the plastic bags, adjust the ice-water mixture inside, and evenly distribute the solid substances inside in the plastic bags, so as to avoid unevenness after quick freezing, and facilitate subsequent stacking and stacking. As the positioning pressing plate 48 squeezes the surface of the plastic bags, the metal shaft on the surface of the toggle rod can continuously knock and flatten the surface of the plastic bags under the action of the compression ring 481;

[0041] Finally, during the stacking process, the plastic bags can fall into the storage box along the rectangular frame 5. The rubber blocks inside the rectangular frame 5 can slow down the conveying speed. When the plastic bags are stacked vertically inside the storage box, the lifting frame 21 can move upward and then quickly reset. At the same time, the transmission roller 12 is movable to press the elastic baffle 51 against one side of the plastic bag, so that the plastic bags can be evenly laid inside the storage box.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-frozen packaging device for aquatic products, comprising a transmission frame (1), a positioning frame (2) arranged outside the transmission frame (1), and a conveying frame (4) and a loading box (3) located inside the positioning frame (2), characterized in that: A plurality of transmission rollers (12) are installed inside the transmission frame (1), and a plastic tube is sleeved on the surface of the transmission roller (12). A pair of positioning plates (11) are movably provided at the top of the transmission frame (1), and the spacing between the positioning plates (11) can be adjusted. The positioning frame (2) is rectangular and is installed on the outer wall of the transmission frame (1); A pair of slide grooves are provided inside the positioning frame (2), and a lifting frame (21) is movably provided between the slide grooves. The conveying frame (4) is installed on the top of the lifting frame (21). The conveying frame (4) is used to convey the plastic-sealed bags to the storage box. A pair of arc-shaped telescopic rods are installed at one end of the conveying frame (4), and the loading box (3) is installed at one end of the arc-shaped telescopic rods.

2. The aquatic product quick-freezing and packing equipment according to claim 1 is characterized in that: A straight groove is provided on one side of the loading box (3), and a positioning shaft (31) is installed inside the straight groove. A pair of limit baffles (32) are movably clamped at the bottom of the positioning shaft (31). A limit bolt is provided at the top end of the positioning shaft (31). A bolt hole is provided at the top of the limit baffle (32), and the limit bolt is used to adjust the spacing of the limit baffles (32). A limiting pressure plate (34) is installed on one side of the feeding box (3), the limiting pressure plate (34) is located between the limiting baffles (32), the limiting pressure plate (34) is U-shaped and has elasticity in the middle section, a pair of telescopic rods are installed on the inner wall of the limiting pressure plate (34), and one end of the telescopic rod is clamped on the inner wall of the feeding box (3).

3. The aquatic product quick-freezing and packing equipment according to claim 1, characterized in that: A control motor is installed at the bottom of the feeding box (3), and a push plate (33) is installed on the output end of the control motor. The push plate (33) passes through the bottom of the feeding box (3). A condenser is provided in the inner wall of the feeding box (3) for maintaining the temperature of the aquatic product.

4. The aquatic product quick-freezing and packing equipment according to claim 1, characterized in that: The side of the conveying frame (4) away from the loading box (3) is inclined, and a pair of support frames (42) are installed on the conveying frame (4), and the support frames (42) are symmetrically arranged. Blocking plates (41) are installed on the tops of the support frames (42) on both sides, and the blocking plates (41) are arranged parallel to the inclined side of the conveying frame (4), and a channel for plastic bag transmission is formed between the bottom of the blocking plate (41) and the inclined side of the conveying frame (4).

5. The aquatic product quick-freezing and packing equipment according to claim 4 is characterized in that: A plurality of limit plates (43) are installed at the bottom of the blocking plate (41), and the limit plates (43) are arranged around the blocking plate (41). A storage rack (431) is fixedly connected to the bottom of the limit plate (43). A rotating shaft (44) is rotatably provided inside the storage rack (431), and compression spring plates (45) are installed on the rotating shaft (44). The compression spring plates (45) at both ends are symmetrically arranged, and a positioning pressure plate (48) is installed between the compression spring plates (45).

6. The aquatic product quick-freezing and packing equipment according to claim 5, characterized in that: A plurality of compression rings (481) are installed at both ends of the positioning pressure plate (48), the compression rings (481) are made of elastic material, a toggle rod is fixedly connected between the compression rings (481), and a metal shaft is fixedly connected to the toggle rod for leveling.

7. The aquatic product quick-freezing and packing equipment according to claim 5, characterized in that: The storage rack (431) is provided with a circular groove, and a transmission shaft (46) is inserted into the circular groove. The transmission shaft (46) is clamped inside the rotating shaft (44). A fixing rack (47) is fixedly connected to the transmission shaft (46). The angle of the fixing rack (47) can be adjusted by following the rotation of the transmission shaft (46). The bottom of the fixing rack (47) abuts against the top of the conveying rack (4). A conveying baffle (471) is installed on the fixing rack (47), and the conveying baffle (471) is elastic.

8. The aquatic product quick-freezing and packing equipment according to claim 1, characterized in that: The bottom of the conveying frame (4) is provided with a slot, and a rectangular frame (5) is installed inside the slot. The spacing inside the rectangular frame (5) is adjustable. A plurality of elastic baffles (51) are installed at the outer end of the rectangular frame (5). Plastic gaskets are provided on the surface of the elastic baffles (51).

Images