A live seafood transport container

Abstract

The application discloses a live seafood transportation container and belongs to the technical field of aquatic product transportation.The container comprises an outer box body, an inner box body arranged in the outer box body, a support fixedly installed on one side of the outer box body, a water pump fixedly installed at the top of the support, a water suction pipe in communication with the bottom of the outer box body at the water suction end of the water pump, a biological filtration mechanism arranged in the middle of the water suction pipe, the biological filtration mechanism comprising a filter pipe, the filter pipe being threadedly connected with the water suction pipe at both ends, ceramic ring layers, bacterial layers and activated carbon layers being sequentially installed in the filter pipe, a water supply pipe in communication with the top of the outer box body at the water discharge end of the water pump, a PVC ultraviolet disinfection pipe installed in the middle of the water supply pipe, an oxygen supply mechanism arranged at the bottom of the outer box body, and a detection mechanism arranged in the inner box body.The biological filtration mechanism can effectively remove excrement and substances produced by the decomposition of residual food in water, and the PVC ultraviolet disinfection pipe can reduce water quality fluctuation, so that the survival rate of seafood during long-distance transportation is greatly improved.

Description

Technical Field

[0001] This application relates to the field of aquatic product transportation technology, and in particular to a live seafood transportation container. Background Technology

[0002] Live seafood transportation is a crucial link in the aquatic product industry. With the upgrading of consumption and the development of fresh food e-commerce, the market demand for live seafood transportation is increasing. Currently, the industry mainly uses water truck transportation, oxygenated plastic bag transportation, and temporary holding tank transfer to realize the circulation of live seafood.

[0003] The current mainstream transportation method is water truck transportation, which uses open water tanks and relies on continuous oxygenation and frequent water changes. However, it generally suffers from problems such as large fluctuations in water quality, unstable dissolved oxygen, and accumulation of excrement. In long-distance transportation, it also suffers from problems such as low survival rate, water quality deterioration, and cumbersome operation.

[0004] Therefore, this application provides a live seafood transport container. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a live seafood transport container that overcomes these deficiencies. It aims to solve the problems of current mainstream transportation methods, which rely on water trucks with open tanks and depend on continuous oxygenation and frequent water changes. However, these methods generally suffer from large fluctuations in water quality, unstable dissolved oxygen, and accumulation of excrement. Furthermore, they result in low survival rates, water quality deterioration, and cumbersome operations during long-distance transportation.

[0006] To achieve the above objectives, this application provides the following technical solution: a live seafood transport container, comprising an outer casing, an inner casing inside the outer casing, a support fixedly installed on one side of the outer casing, a water pump fixedly installed at the top of the support, a water pump's pumping end connected to the bottom of the outer casing via a water pumping pipe, a biological filtration mechanism provided in the middle of the water pumping pipe, the biological filtration mechanism comprising a filter pipe, both ends of the filter pipe being threadedly connected to the water pumping pipe, a ceramic ring layer, a bacterial layer, and an activated carbon layer sequentially installed inside the filter pipe, a water pump's draining end connected to the top of the outer casing via a water inlet pipe, a PVC ultraviolet disinfection pipe installed in the middle of the water inlet pipe, an oxygen supply mechanism provided at the bottom of the outer casing, and a detection mechanism provided inside the outer casing.

[0007] By adopting the above technical solution, water is automatically pumped from the bottom of the inner tank and enters the filter pipe through the water pump. The water first flows through the ceramic ring layer, which has a large specific surface area, providing a place for beneficial microorganisms such as nitrifying bacteria to attach and grow, thus initially filtering out large particulate impurities in the water. Then the water enters the bacterial layer, where nitrifying bacteria and other microorganisms decompose harmful substances such as ammonia nitrogen in the water into harmless nitrates, further purifying the water quality. Finally, the water passes through the activated carbon layer, which has a strong adsorption capacity and can adsorb odors, pigments, and residual small impurities in the water, thus deeply purifying the water quality. When the purified water passes through the PVC ultraviolet disinfection tube in the middle of the inlet pipe, the ultraviolet light of an appropriate wavelength destroys the DNA or RNA molecular structure in the microbial cells, thereby achieving the effect of sterilization and disinfection. The water then returns to the inside of the inner tank, thereby reducing the frequency of water changes. The biological filtration mechanism can effectively remove excrement and substances produced by the decomposition of uneaten food in the water. Combined with the PVC ultraviolet disinfection tube, it reduces water quality fluctuations and greatly improves the survival rate of seafood during long-distance transportation.

[0008] As a preferred technical solution of this application, the detection mechanism includes a dissolved oxygen detector, which is fixedly installed on the inner wall of the outer casing. An ammonia nitrogen content detector is fixedly installed on the inner wall of the outer casing below the dissolved oxygen detector. A pH value detector is fixedly installed on the inner wall of the outer casing below the ammonia nitrogen content detector. A riser is fixedly installed on the top of the outer casing, and a camera is installed on the top of the riser. A controller is fixedly installed on one side of the outer casing, and the controller is electrically connected to the detection mechanism.

[0009] By adopting the above technical solutions, dissolved oxygen parameters of the water quality during transportation are monitored in real time by a dissolved oxygen detector, ammonia nitrogen content parameters of the water quality during transportation are monitored in real time by an ammonia nitrogen content detector, and pH value parameters of the water quality during transportation are monitored in real time by a pH value detector. The activity status and body color changes of the seafood are monitored in real time by a camera. The testing agency transmits the collected data to the controller, which helps operators to understand the water quality parameters and the status of the seafood in real time and accurately. Once abnormal water quality or stress reaction of seafood is detected, measures can be taken quickly to make adjustments.

[0010] As a preferred technical solution of this application, the oxygen supply mechanism includes a rectangular plate, which is fixedly installed on the side wall of the outer casing below the bracket. An oxygen supply pump is fixedly installed at the top of the rectangular plate, and an oxygen delivery pipe is installed at the output end of the oxygen supply pump. The oxygen delivery pipe extends to the bottom of the outer casing, and the oxygen delivery pipe at the bottom of the outer casing has several sets of air holes.

[0011] By adopting the above technical solution, the oxygen pump compresses the air and delivers it to the bottom of the outer tank through the oxygen supply pipe. The air is released evenly from the air holes, forming tiny bubbles, which increases the dissolved oxygen content in the water, thereby achieving the purpose of stable and uniform oxygen supply to the water body and ensuring that live seafood has sufficient oxygen supply during transportation.

[0012] As a preferred technical solution of this application, a temperature control cavity is formed between the outer casing and the inner casing. The temperature control cavity is arranged in a ring shape. A water inlet pipe is fixedly installed on the top of the outer casing and is located on one side of the controller. A drain pipe is fixedly installed on the bottom of the outer casing directly below the water inlet pipe. Both the water inlet pipe and the drain pipe are connected to the temperature control cavity. A control valve is fixedly installed inside both the water inlet pipe and the drain pipe.

[0013] By adopting the above technical solution, hot water is injected into the temperature control chamber through the water inlet pipe when the temperature is low and needs to be raised, and cold water is injected into the temperature control chamber through the water inlet pipe when the temperature is high and needs to be lowered, which helps to provide a suitable survival temperature environment for live seafood.

[0014] As a preferred technical solution of this application, the shock absorption mechanism includes a base located below the outer casing. The top of the base has a slot, and the bottom of the outer casing is movably connected to the slot. Several sets of springs are installed between the base and the bottom of the outer casing.

[0015] By adopting the above technical solution, when the outer box is subjected to vibration or impact, the spring will undergo elastic deformation to absorb and buffer the vibration energy, thus minimizing the stress response of seafood caused by vehicle bumps during transportation.

[0016] As a preferred technical solution of this application, the bottom of the base is provided with two sets of slots.

[0017] By adopting the above technical solution, the two sets of slots provide a point of application when using an external forklift for loading and unloading, thereby improving the stability during loading and unloading.

[0018] As a preferred technical solution of this application, an insulation layer is fixedly installed inside the wall of the outer casing.

[0019] By adopting the above technical solution, the insulation layer is specifically a polystyrene layer, which prevents heat exchange between the outside and the water in the inner box, thereby reducing temperature fluctuations inside the inner box.

[0020] As a preferred technical solution of this application, the spring is provided with a telescopic guide rod inside, and the telescopic guide rod is installed between the base and the outer casing.

[0021] By adopting the above technical solution, the spring is guided by the telescopic guide rod, which helps to extend the service life of the spring.

[0022] The beneficial effects of this application are: 1. The water pump automatically draws water from the bottom of the inner tank. As the water enters the filter tube through the suction pipe, it first flows through the ceramic ring layer. The ceramic rings have a large specific surface area, providing a place for beneficial microorganisms such as nitrifying bacteria to attach and grow, initially filtering out large particulate impurities in the water. Next, the water enters the bacterial layer, where nitrifying bacteria and other microorganisms decompose harmful substances such as ammonia nitrogen in the water into harmless nitrates, further purifying the water quality. Finally, the water passes through the activated carbon layer. Activated carbon has a strong adsorption capacity, which can adsorb odors, pigments, and residual small impurities in the water, resulting in deep purification of the water quality. When the purified water passes through the PVC ultraviolet disinfection tube in the middle of the water inlet pipe, the ultraviolet light of an appropriate wavelength destroys the DNA or RNA molecular structure of the microbial cells, thereby achieving a sterilization and disinfection effect. The water then returns to the inside of the inner tank, thus reducing the frequency of water changes. The biological filtration mechanism can effectively remove excrement and substances produced by the decomposition of uneaten food in the water. Combined with the PVC ultraviolet disinfection tube, it reduces water quality fluctuations and greatly improves the survival rate of seafood during long-distance transportation.

[0023] 2. Dissolved oxygen parameters of the water during transportation are monitored in real time by a dissolved oxygen detector, ammonia nitrogen content parameters of the water during transportation by ammonia nitrogen content detector, and pH value parameters of the water during transportation by a pH value detector. The activity status and body color changes of the seafood are monitored in real time by a camera. The testing agency transmits the collected data to the controller, which helps operators to understand the water quality parameters and the status of the seafood in real time and accurately. Once abnormal water quality or stress reaction of seafood is detected, measures can be taken quickly to make adjustments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a partial cross-sectional structural diagram of this application; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of a biological filtration mechanism.

[0025] In the diagram: 1. Outer casing; 2. Shock absorption mechanism; 201. Base; 202. Slot; 203. Spring; 204. Telescopic guide rod; 3. Inner casing; 4. Bracket; 5. Water pump; 6. Pumping pipe; 7. Biological filtration mechanism; 701. Filter pipe; 702. Ceramic ring layer; 703. Bacterial layer; 704. Activated carbon layer; 9. Inlet pipe; 10. PVC ultraviolet disinfection pipe; 11. Oxygen supply mechanism; 110 1. Rectangular plate; 1102. Oxygen pump; 1103. Oxygen delivery pipe; 1105. Vent; 12. Detection mechanism; 1201. Dissolved oxygen detector; 1202. Ammonia nitrogen content detector; 1203. pH value detector; 1204. Elevator; 1205. Camera; 13. Controller; 14. Temperature control chamber; 15. Water supply pipe; 16. Drain pipe; 17. Control valve; 18. Slot; 19. Insulation layer. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Reference Figure 1-4 A live seafood transport container includes an outer casing 1, an inner casing 3 inside the outer casing 1, a bracket 4 fixedly installed on one side of the outer casing 1, a water pump 5 fixedly installed at the top of the bracket 4, a water pump 5 having its pump end connected to the bottom of the outer casing 1 via a water pump pipe 6, a biological filtration mechanism 7 located in the middle of the water pump pipe 6, the biological filtration mechanism 7 including a filter pipe 701, both ends of the filter pipe 701 being threadedly connected to the water pump pipe 6, and a ceramic ring layer 702, a bacterial layer 703, and an activated carbon layer 704 sequentially installed inside the filter pipe 701, and a water pump 5 having its drain end connected to the top of the outer casing 1 via a [missing information - likely a continuation of the previous sentence]. The water inlet pipe 9 has a PVC ultraviolet disinfection tube 10 installed in the middle. An oxygen supply mechanism 11 is set at the bottom of the outer casing 1, and a detection mechanism 12 is set inside the outer casing 1. The oxygen supply mechanism 11 includes a rectangular plate 1101, which is fixedly installed on the side wall of the outer casing 1 below the bracket 4. An oxygen pump 1102 is fixedly installed at the top of the rectangular plate 1101. An oxygen delivery pipe 1103 is installed at the output end of the oxygen pump 1102. The oxygen delivery pipe 1103 extends to the bottom of the outer casing 1, and the oxygen delivery pipe 1103 at the bottom of the outer casing 1 has several sets of air holes 1105.

[0028] Water is automatically drawn from the bottom of the inner tank 3 by water pump 5 and enters the filter pipe 701 through the water suction pipe 6. First, the water flows through the ceramic ring layer 702. The ceramic rings have a large specific surface area, providing a place for beneficial microorganisms such as nitrifying bacteria to attach and grow, initially filtering out large particulate impurities in the water. Next, the water enters the bacterial layer 703, where nitrifying bacteria and other microorganisms decompose harmful substances such as ammonia nitrogen into harmless nitrates, further purifying the water. Finally, the water passes through the activated carbon layer 704. Activated carbon has a strong adsorption capacity, adsorbing odors, pigments, and residual small impurities in the water, achieving deep purification. The purified water then passes through the PVC ultraviolet disinfection tube 10 in the middle of the inlet pipe 9, utilizing an appropriate wavelength... Ultraviolet light destroys the DNA or RNA molecular structure in the cells of microorganisms, thereby achieving sterilization and disinfection. The ultraviolet light then returns to the interior of the inner tank 3, reducing the frequency of water changes. The biological filtration mechanism 7 effectively removes excrement and substances produced by the decomposition of uneaten food from the water. Combined with the PVC ultraviolet disinfection tube 10, it reduces water quality fluctuations and greatly improves the survival rate of seafood during long-distance transportation. The oxygen pump 1102 compresses air and delivers it to the bottom of the outer tank 1 of the inner tank through the oxygen supply pipe 1103. The air is evenly released from the air vents 1105, forming tiny bubbles that increase the dissolved oxygen content in the water, thereby achieving a stable and uniform oxygen supply to the water and ensuring that live seafood has sufficient oxygen during transportation.

[0029] Reference Figure 1-3 The detection mechanism 12 includes a dissolved oxygen detector 1201, which is fixedly installed on the inner wall of the outer casing 1. An ammonia nitrogen detector 1202 is fixedly installed on the inner wall of the outer casing 1 below the dissolved oxygen detector 1201. A pH detector 1203 is fixedly installed on the inner wall of the outer casing 1 below the ammonia nitrogen detector 1202. A riser 1204 is fixedly installed on the top of the outer casing 1, and a camera 1205 is installed on the top of the riser 1204. A camera 1205 is fixedly installed on one side of the outer casing 1. A controller 13 is fixedly installed, and the controller 13 is electrically connected to the detection mechanism 12; a temperature control cavity 14 is formed between the outer box 1 and the inner box 3. The temperature control cavity 14 is arranged in a ring. A water inlet pipe 15 is fixedly installed on the top of the outer box 1. The water inlet pipe 15 is located on one side of the controller 13. A drain pipe 16 is fixedly installed on the bottom of the outer box 1 directly below the water inlet pipe 15. Both the water inlet pipe 15 and the drain pipe 16 are connected to the temperature control cavity 14. A control valve 17 is fixedly installed inside both the water inlet pipe 15 and the drain pipe 16. The dissolved oxygen detector 1201 monitors the dissolved oxygen parameters of the water quality in real time during transportation, the ammonia nitrogen content detector 1202 monitors the ammonia nitrogen content parameters of the water quality in real time during transportation, and the pH value detector 1203 monitors the pH value parameters of the water quality in real time during transportation. The camera 1205 monitors the activity status and body color changes of the seafood in real time. The detection agency 12 transmits the collected data to the controller 13, which helps operators to understand the water quality parameters and the status of the seafood in real time and accurately. Once abnormal water quality or stress reaction of seafood is detected, measures can be taken quickly to make adjustments. When the temperature is low and heating is needed, hot water is injected into the temperature control chamber 14 through the water inlet pipe 15. When the temperature is high and cooling is needed, cold water is injected into the temperature control chamber 14 through the water inlet pipe 15, which helps to provide a suitable survival temperature environment for live seafood.

[0030] Reference Figure 1-3 The shock absorption mechanism 2 includes a base 201 located below the outer casing 1. The top of the base 201 has a slot 202, and the bottom of the outer casing 1 is movably connected to the slot 202. Several sets of springs 203 are installed between the base 201 and the bottom of the outer casing 1. An insulation layer 19 is fixedly installed inside the wall of the outer casing 1. When the outer casing 1 is subjected to vibration or impact, the springs 203 will undergo elastic deformation to absorb and buffer the vibration energy, thereby minimizing the stress reaction of seafood caused by vehicle bumps during transportation. The insulation layer 19 is specifically a polystyrene layer, which prevents heat exchange between the outside and the water in the inner casing 3, thereby reducing temperature fluctuations inside the inner casing 3.

[0031] Reference Figure 1-3 The bottom of the base 201 has two sets of slots 18; the spring 203 has a telescopic guide rod 204 inside, which is installed between the base 201 and the outer housing 1; the two sets of slots 18 facilitate the use of external forklifts to provide a point of action when loading and unloading, thus improving the stability during loading and unloading; the telescopic guide rod 204 guides the spring 203, which helps to extend the service life of the spring 203.

[0032] Working Principle: Water is automatically drawn from the bottom of the inner tank 3 by water pump 5 and enters the filter pipe 701 through the water suction pipe 6. First, the water flows through the ceramic ring layer 702. The ceramic rings have a large specific surface area, providing a place for beneficial microorganisms such as nitrifying bacteria to attach and grow, initially filtering out large particulate impurities in the water. Next, the water enters the bacterial layer 703, where nitrifying bacteria and other microorganisms decompose harmful substances such as ammonia nitrogen into harmless nitrates, further purifying the water. Finally, the water passes through the activated carbon layer 704. Activated carbon has a strong adsorption capacity, adsorbing odors, pigments, and residual small impurities in the water, achieving deep purification. The purified water then passes through the PVC ultraviolet disinfection tube 10 in the middle of the inlet pipe 9. Ultraviolet light of appropriate wavelength destroys the DNA or RNA molecular structure in the microbial cells, achieving sterilization and disinfection, before returning to the inner tank. The interior of the tank 3 reduces the frequency of water changes. The biological filtration mechanism 7 effectively removes excrement and substances produced by the decomposition of uneaten food from the water. Combined with the PVC ultraviolet disinfection tube 10, it reduces water quality fluctuations and greatly improves the survival rate of seafood during long-distance transportation. The dissolved oxygen detector 1201 monitors the dissolved oxygen parameters of the water quality in real time during transportation. The ammonia nitrogen content detector 1202 monitors the ammonia nitrogen content parameters of the water quality in real time during transportation. The pH value detector 1203 monitors the pH value parameters of the water quality in real time during transportation. The camera 1205 monitors the activity status and body color changes of the seafood in real time. The detection mechanism 12 transmits the collected data to the controller 13, which helps operators to understand the water quality parameters and the status of the seafood in real time and accurately. Once abnormal water quality or stress reaction of seafood is detected, measures can be taken quickly to make adjustments. Among them, the oxygen pump 1102 compresses the air and delivers it to the bottom of the outer box 1 of the inner box through the oxygen supply pipe 1103. The air is released evenly from the air hole 1105 to form tiny bubbles, which increases the dissolved oxygen content in the water, thereby achieving the purpose of stable and uniform oxygen supply to the water body and ensuring that live seafood has sufficient oxygen supply during transportation. When the temperature is low and needs to be heated, hot water is injected into the temperature control chamber 14 through the water supply pipe 15. When the temperature is high and needs to be cooled, cold water is injected into the temperature control chamber 14 through the water supply pipe 15, which is conducive to providing a suitable survival temperature environment for live seafood. Meanwhile, when the outer casing 1 is subjected to vibration or impact, the spring 203 will undergo elastic deformation to absorb and buffer the vibration energy, minimizing the stress response of the seafood caused by vehicle bumps during transportation; the two sets of slots 18 provide a point of application for loading and unloading using external forklifts, improving the stability during loading and unloading. In addition, the insulation layer 19 is specifically a polystyrene layer, which prevents heat exchange between the outside heat and the water in the inner box 3, thereby reducing temperature fluctuations in the inner box 3; the telescopic guide rod 204 guides the spring 203, which helps to extend the service life of the spring 203.

[0033] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A live seafood transport container, comprising an outer casing (1), characterized in that, The outer casing (1) is provided with an inner casing (3). A bracket (4) is fixedly installed on one side of the outer casing (1). A water pump (5) is fixedly installed at the top of the bracket (4). The water pump (5) has a water pump pipe (6) connected to the bottom of the outer casing (1). A biological filtration mechanism (7) is provided in the middle of the water pump pipe (6). The biological filtration mechanism (7) includes a filter pipe (701). The two ends of the filter pipe (701) are threadedly connected to the water pump pipe (6). A ceramic ring layer (702), a bacterial layer (703), and an activated carbon layer (704) are installed in sequence inside the filter pipe (701). The water pump (5) has an inlet pipe (9) connected to the top of the outer casing (1). A PVC ultraviolet disinfection pipe (10) is installed in the middle of the inlet pipe (9). An oxygen supply mechanism (11) is provided at the bottom of the outer casing (1). A detection mechanism (12) is provided inside the outer casing (1).

2. The live seafood transport container according to claim 1, characterized in that, The detection mechanism (12) includes a dissolved oxygen detector (1201), which is fixedly installed on the inner wall of the outer casing (1). An ammonia nitrogen content detector (1202) is fixedly installed on the inner wall of the outer casing (1) below the dissolved oxygen detector (1201). A pH value detector (1203) is fixedly installed on the inner wall of the outer casing (1) below the ammonia nitrogen content detector (1202). A riser (1204) is fixedly installed on the top of the outer casing (1). A camera (1205) is installed on the top of the riser (1204). A controller (13) is fixedly installed on one side of the outer casing (1). The controller (13) is electrically connected to the detection mechanism (12).

3. The live seafood transport container according to claim 1, characterized in that, The oxygen supply mechanism (11) includes a rectangular plate (1101), which is fixedly installed on the side wall of the outer casing (1) below the bracket (4). An oxygen pump (1102) is fixedly installed on the top of the rectangular plate (1101). An oxygen delivery pipe (1103) is installed at the output end of the oxygen pump (1102). The oxygen delivery pipe (1103) extends to the bottom of the outer casing (1), and the oxygen delivery pipe (1103) at the bottom of the outer casing (1) has several sets of air holes (1105).

4. A live seafood transport container according to claim 2, characterized in that, A temperature control cavity (14) is formed between the outer casing (1) and the inner casing (3). The temperature control cavity (14) is arranged in a ring shape. A water inlet pipe (15) is fixedly installed on the top of the outer casing (1). The water inlet pipe (15) is located on one side of the controller (13). A drain pipe (16) is fixedly installed on the bottom of the outer casing (1) directly below the water inlet pipe (15). Both the water inlet pipe (15) and the drain pipe (16) are connected to the temperature control cavity (14). A control valve (17) is fixedly installed inside both the water inlet pipe (15) and the drain pipe (16).

5. A live seafood transport container according to claim 1, characterized in that, It also includes a shock absorption mechanism (2), which includes a base (201) located below the outer casing (1). The top of the base (201) is provided with a slot (202), and the bottom of the outer casing (1) is movably connected to the slot (202). Several sets of springs (203) are installed between the base (201) and the bottom of the outer casing (1).

6. A live seafood transport container according to claim 5, characterized in that, The base (201) has two sets of slots (18) at its bottom.

7. A live seafood transport container according to claim 1, characterized in that, An insulation layer (19) is fixedly installed inside the wall of the outer casing (1).

8. A live seafood transport container according to claim 5, characterized in that, The spring (203) has a telescopic guide rod (204) inside, which is installed between the base (201) and the outer casing (1).

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