Photoelectric material turnover barrel convenient to transport

Abstract

The invention discloses a photoelectric material transfer barrel convenient to transport, and belongs to the technical field of photoelectric material transfer, the photoelectric material transfer barrel comprises a barrel body and a barrel cover, the top end of the barrel cover is provided with at least one liquid channel, the inner side of the top end of the liquid channel is provided with a built-in pipe, and the top end of the built-in pipe is connected with a pipe cover; the fixing ring is fixed to the inner side of the liquid channel and located below the built-in pipe, the opposite ends of the inner side of the fixing ring and the inner side of the built-in pipe are fixedly connected with the upper edge and the lower edge of the sealing rubber sleeve respectively, the section of the middle of the sealing rubber sleeve is semicircular, and the periphery of the middle of the sealing rubber sleeve is sleeved with an annular rubber ring. An adjusting assembly for driving the built-in pipe to move up and down is arranged on the outer side of the liquid channel. A dynamic sealing structure is adopted, the annular rubber ring is extruded by adjusting the built-in pipe, so that the sealing rubber sleeve is tightly attached to the liquid injection pipe or the liquid taking pipe, dynamic sealing during liquid injection / liquid taking is achieved, residual liquid is scraped when the liquid injection pipe or the liquid taking pipe is pulled out, liquid volatilization and environmental pollution are reduced, and operation safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optoelectronic material transportation, and particularly to a turnover barrel for optoelectronic materials that is convenient for transportation, and is especially suitable for the sealed storage and safe transportation of volatile liquids such as phosphorus trichloride. Background Art

[0002] Optoelectronic materials refer to materials used to manufacture various optoelectronic devices (mainly including various active and passive optoelectronic sensors, optical information processing and storage devices, and optical communication, etc.), and mainly include infrared materials, laser materials, optical fiber materials, nonlinear optical materials, etc. Optoelectronic materials include new materials such as high-purity yellow phosphorus, red phosphorus, phosphorus oxychloride, phosphorus trichloride, diphosphorus pentoxide, and electronic-grade phosphoric acid. Due to the particularity of optoelectronic materials, specific turnover barrels are required for transporting these materials during turnover. Especially for the transportation of phosphorus trichloride, during the handling and storage of phosphorus oxychloride, closed operation is required, and workers need to wear protective gloves, goggles, and protective clothing to avoid inhaling the fumes or vapors of this substance and avoid contact with the skin and eyes.

[0003] When filling or taking out liquid from the existing turnover barrel for storing phosphorus trichloride liquid, the sealing plug on the inlet of the turnover barrel is removed. If the entire barrel body is directly tilted for taking out liquid, it is easy to accidentally spill, and the safety is very low; therefore, a pipeline is inserted into the turnover barrel, and filling or taking out liquid is carried out through the pipeline. The gap between the pipeline and the barrel body is likely to cause liquid volatilization or leakage, polluting the environment and posing a safety hazard; moreover, during the operation process, since the external pipeline directly extends into the barrel body, its surface will be contaminated with some liquid. If it is directly pulled out, a small amount of liquid may be brought out, which will cause a certain degree of pollution to the outside of the barrel and pose a danger to the environment and human body. Summary of the Invention

[0004] Technical problems to be solved: Aiming at the technical problems existing in the process of transporting optoelectronic materials by the existing turnover barrel, the present invention provides a turnover barrel for optoelectronic materials that is convenient for transportation, and solves the above problems by improving the sealing structure and adding a fixing component.

[0005] Technical solution: A turnover barrel for optoelectronic materials that is convenient for transportation according to the present invention includes: A barrel body, a barrel cover is provided on the barrel body, at least one liquid channel is provided at the top end of the barrel cover, one end of the liquid channel penetrates through the barrel cover and extends into the barrel body, and an inner pipe is provided inside the top end of the liquid channel; A pipe cover, which is threadedly connected to the top end of the inner pipe; A fixed ring, which is fixed inside the liquid channel and located below the inner tube. The opposite inner ends of the fixed ring and the inner tube are respectively fixedly connected to the upper and lower edges of the sealing rubber sleeve. The middle cross-section of the sealing rubber sleeve is semi-circular, and an annular rubber ring is sleeved on the outer circumference of the middle part of the sealing rubber sleeve. An adjusting assembly for driving the inner tube to move up and down is arranged outside the liquid channel; Wherein, when the adjusting assembly drives the inner tube to move downward, it squeezes the annular rubber ring to deform inward, and then the middle part of the sealing rubber sleeve expands inward, so as to be hermetically connected to the liquid injection tube or the liquid extraction tube inserted into the liquid channel; when the adjusting assembly drives the inner tube to move upward, it relaxes the extrusion of the annular rubber ring, the annular rubber ring deforms outward and resets, and then relaxes the extrusion of the middle part of the sealing rubber sleeve. The middle part of the sealing rubber sleeve resets outward to reduce the extrusion of the liquid injection tube or the liquid extraction tube, so as to facilitate the extraction of the liquid injection tube or the liquid extraction tube.

[0006] Preferably, the bottom end of the inner tube and the top end of the fixed ring are both arc-shaped, so as to facilitate the annular rubber ring to be received in the annular cavity between the inner tube and the fixed ring.

[0007] Preferably, there are two liquid channels, namely a liquid injection tube and a liquid extraction tube respectively, and the liquid extraction tube is longer than the liquid injection tube.

[0008] Preferably, the adjusting assembly includes a rotating tube threadedly connected to the outer circumference of the top of the liquid channel. The inner circumference of the top of the rotating tube is rotatably connected to the inner tube through a bearing; A limiting slider is fixed on the side of the inner tube, and a limiting chute for sliding connection with the limiting slider is provided on the inner wall of the liquid channel.

[0009] Preferably, a liquid level observation hole is provided on the back of the barrel body. A transparent cover plate is fastened around the liquid level observation hole by bolts, and a rectangular sealing ring is embedded between the transparent cover plate and the side wall of the barrel body.

[0010] Preferably, both sides of the barrel body are recessed inward, and handrails are rotatably arranged at the recessed parts.

[0011] Preferably, a fixing assembly is provided on the outer side of the barrel cover. The fixing assembly includes an inverted U-shaped frame. A threaded rod is threadedly connected to the center of the inverted U-shaped frame. The bottom end of the threaded rod is rotatably provided with a support plate through a bearing; Both bottom ends of the two side walls of the inverted U-shaped frame are rotatably provided with abutting plates; An annular bin is fixed on the top of the barrel cover, and a horizontal metal ring is fixed on the inner wall of the annular bin.

[0012] Preferably, sleeves are fixed to both bottom ends of the two side walls of the inverted U-shaped frame. A T-shaped rod with one end passing through and extending below the sleeve is provided at the top of the sleeve, and the abutting plate is fixed to the bottom end of the T-shaped rod.

[0013] Preferably, the top of the barrel body is an open structure and is provided with an external threaded area in its circumference, the inner side wall of the barrel cover is provided with an internal threaded area, and the barrel cover is threadedly connected to the top of the barrel body; A sealing metal ring is fixed to the inner top wall of the barrel cover, a sealing ring abutting against the inner side of the top end of the barrel body is fixed to the outer peripheral wall of the sealing metal ring, and the outer side of the sealing ring is a slope structure.

[0014] Preferably, a handle is provided on the top of the barrel cover.

[0015] The present invention provides a photovoltaic material turnover barrel that is convenient for transportation. By improving the sealing structure and adding a fixing component, the following technical effects are achieved: 1. The present invention adopts a dynamic sealing structure. By adjusting the built-in tube to squeeze the annular rubber ring, the sealing rubber sleeve is tightly attached to the injection tube or the liquid extraction tube, so as to achieve dynamic sealing during injection / liquid extraction. When the injection tube or the liquid extraction tube is pulled out, the residual liquid is scraped off, thereby reducing liquid volatilization and environmental pollution, and improving operation safety. 2. The turnover barrel adopts a split liquid channel. The injection pipe and the liquid extraction pipe are set independently. The length difference supports continuous operation; it supports continuous injection / liquid extraction operation to improve efficiency; 3. The fixed components can realize the fixed integrated connection of multiple turnover barrels. The inverted U-shaped frame, threaded rods and other structures connect multiple turnover barrels as a whole, which improves the transportation stability and makes it less likely to tip over during transportation; 4. The barrel body is provided with a liquid level observation hole and a transparent cover plate, which can monitor the liquid level in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of the structure of the turnover barrel of the present invention along the axial direction; Figure 2 for Figure 1 A magnified view of the structure of the middle turnover barrel A; Figure 3 for Figure 1 A magnified view of the structure at B of the middle turnover barrel; Figure 4 Photos of the existing loading process of the turnover barrel transportation.

[0017] Figure numerals: 1. barrel body; 2. barrel cover; 3. liquid channel; 31. liquid filling tube; 32. liquid extraction tube; 4. built-in tube; 5. tube cover; 6. fixing ring; 7. sealing rubber sleeve; 8. annular rubber ring; 9. rotating tube; 10. limiting slider; 11. limiting slide groove; 12. liquid level observation hole; 13. transparent cover plate; 14. rectangular sealing ring; 15. sealing metal ring; 16. sealing ring; 17. handle; 18. inverted U-shaped frame; 19. threaded rod; 20. support plate; 21. abutment plate; 22. annular bin; 23. horizontal metal ring; 24. sleeve; 25. T-bar; 26. handrail. DETAILED DESCRIPTION

[0018] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figures 1-4 The technical solutions of the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0019] Example 1: Figures 1-3 As shown, the present invention discloses a photovoltaic material turnover barrel which is convenient for transportation, comprising a barrel body 1, a barrel cover 2 being provided on the barrel body 1, and at least one liquid channel 3 is provided on the top of the barrel cover 2, one end of which penetrates the barrel cover 2 and extends into the barrel body 1; the liquid channel 3 is provided with two, namely a liquid injection tube 31 and a liquid extraction tube 32, and the liquid extraction tube 32 is longer than the liquid injection tube 31, so as to support continuous liquid injection / liquid extraction operation, and the liquid discharge or liquid inflow does not interfere with each other, thereby improving efficiency.

[0020] like Figure 2 As shown, an internal tube 4 is provided at the inner side of the top of the liquid channel 3, and a tube cover 5 is threadedly connected to the top of the internal tube 4. A sealing ring is provided between the tube cover 5 and the internal tube 4 to ensure the sealing of the barrel body 1 after the tube cover 5 is covered. When injecting liquid, unscrew the tube cover 5 at the top of the internal tube 4, insert the injection tube or the liquid extraction tube into the liquid channel 3, and make it enter the barrel body 1, so that the phosphorus trichloride liquid can be injected or extracted. After the injection or extraction is completed, the corresponding tube cover 5 is screwed on again to achieve sealing.

[0021] Since the size of the liquid channel 3 is larger than that of the liquid injection pipe or the liquid extraction pipe, there is a certain gap between the two. During the liquid extraction or injection process, some liquid may volatilize, affecting the environment. Moreover, during the operation process, when the liquid injection pipe or the liquid extraction pipe extends into the barrel body 1, some liquid will be contaminated on its surface. If it is directly pulled out, a small amount of liquid may be brought out, contaminating the barrel cover 2 and posing a certain danger to the environment and the human body. For this reason, a fixing ring 6 is fixedly arranged inside the liquid channel 3 and below the built-in pipe 4. The inner opposite ends of the fixing ring 6 and the built-in pipe 4 are fixedly connected to the upper and lower edges of the sealing rubber sleeve 7 respectively. The middle cross-section of the sealing rubber sleeve 7 is semi-circular, and an annular rubber ring 8 is sleeved on the outer circumference of the middle part of the sealing rubber sleeve 7. An adjusting assembly for driving the built-in pipe 4 to move up and down is arranged outside the liquid channel 3. When the adjusting assembly drives the built-in pipe to move downward to squeeze the annular rubber ring 8 to deform inward, and then the middle part of the sealing rubber sleeve 7 expands inward, so as to be hermetically connected to the liquid injection pipe or the liquid extraction pipe inserted into the liquid channel 3. When the adjusting assembly drives the built-in pipe to move upward to relax the extrusion of the annular rubber ring 8, the annular rubber ring 8 deforms and resets outward, and then relaxes the extrusion of the middle part of the sealing rubber sleeve 7. The middle part of the sealing rubber sleeve 7 resets outward to reduce the extrusion of the liquid injection pipe or the liquid extraction pipe, so as to facilitate the pulling out of the liquid injection pipe or the liquid extraction pipe. This turnover barrel adopts a dynamic sealing structure. By adjusting the built-in pipe to squeeze the annular rubber ring, the sealing rubber sleeve is closely attached to the liquid injection pipe or the liquid extraction pipe, realizing dynamic sealing during liquid injection / extraction, scraping off the residual liquid when pulling out the liquid injection pipe or the liquid extraction pipe, reducing liquid volatilization and environmental pollution, and improving operation safety.

[0022] In a specific embodiment, the adjusting assembly includes a rotating pipe 9 threadedly connected to the outer circumference of the top of the liquid channel 3. The inner circumference of the top of the rotating pipe 9 is rotatably connected to the built-in pipe 4 through a bearing. A limiting slider 10 is fixed on the side of the built-in pipe 4, and a limiting chute 11 slidably connected to the limiting slider 10 is opened on the inner wall of the liquid channel 3. When adjusting the built-in pipe 4 up and down through the adjusting assembly, by rotating the rotating pipe 9 up and down, under the guiding action of the limiting slider 10 and the limiting chute 11, the built-in pipe 4 can only perform up and down linear motion along with the lifting of the rotating pipe 9, and the built-in pipe 4 does not rotate axially. The up and down linear movement of the built-in pipe 4 can realize the extrusion or relaxation of the extrusion of the annular rubber ring 8.

[0023] In a preferred embodiment, as Figure 2 shown, in order to avoid damaging the annular rubber ring 8 when the bottom end of the built-in pipe 4 moves downward to squeeze the annular rubber ring 8, the bottom end of the built-in pipe 4 and the top end of the fixing ring 6 are both set to be arc-shaped, so that the annular rubber ring 8 can be received in the annular cavity between the built-in pipe 4 and the fixing ring 6. When the built-in pipe 4 moves downward to squeeze the annular rubber ring 8, the annular rubber ring 8 will not be damaged.

[0024] In a preferred embodiment, as Figure 1As shown, a liquid level observation hole 12 is provided on the back surface of the barrel body 1. A transparent cover plate 13 is fastened around the liquid level observation hole 12 by bolts, and a rectangular sealing ring 14 is embedded between the transparent cover plate 13 and the side wall of the barrel body 1. The liquid level inside the barrel body 1 can be observed through the transparent cover plate 13.

[0025] In a preferred embodiment, as Figure 2 shown, after all the phosphorus trichloride liquid in the barrel body 1 is taken out, in order to thoroughly clean the barrel body 1, the top end of the barrel body 1 is an open structure, and an external thread area is circumferentially provided thereon. The inner side wall of the barrel cover 2 is provided with an internal thread area, and the barrel cover 2 is threadedly connected to the top end of the barrel body 1; a sealing metal ring 15 is fixed to the inner top wall of the barrel cover 2, and a sealing ring 16 that abuts against the inner side of the top end of the barrel body 1 is fixed to the outer peripheral wall of the sealing metal ring 15. The outer side of the sealing ring 16 is a bevel structure. A handle 17 is provided at the top end of the barrel cover 2. During cleaning, the barrel cover 2 is rotated through the handle 17, and the barrel cover 2 is unscrewed from above the barrel body 1, so that the entire barrel body 1 can be cleaned; after cleaning, the barrel cover 2 is screwed back onto the barrel body 1 until the outer peripheral wall of the sealing metal ring 15 abuts against the inner side of the top end of the barrel body 1, and the sealing assembly of the barrel body 1 and the barrel cover 2 can be completed.

[0026] The present invention adopts a dynamic sealing structure. By adjusting the built-in tube to squeeze the annular rubber ring, the sealing rubber sleeve is closely attached to the liquid injection tube or the liquid extraction tube, realizing dynamic sealing during liquid injection / extraction. When the liquid injection tube or the liquid extraction tube is pulled out, the residual liquid is scraped off, reducing liquid volatilization and environmental pollution, and improving operation safety; the turnover barrel adopts a split liquid channel, the liquid injection tube and the liquid extraction tube are independently arranged, and the length difference supports continuous operation, supporting continuous liquid injection / extraction operation and improving efficiency; a liquid level observation hole and a transparent cover plate are provided on the barrel body, and the liquid level can be monitored in real time.

[0027] Embodiment 2: As Figure 4 shown, during the transportation of conventional turnover barrels, multiple turnover barrels are usually stacked together. However, the stacked turnover barrels are prone to shaking or tipping during transportation, resulting in liquid leakage accidents. Therefore, based on the technical solution of the turnover barrel in Embodiment 1, as Figure 1 and Figure 3 shown, a circular bin 22 is fixed to the top of the barrel cover 2, and a horizontal metal ring 23 is fixed to the inner wall of the circular bin 22. A fixing component is provided on the outer side of the barrel cover 2. The fixing component includes an inverted U-shaped frame 18. A threaded rod 19 is threadedly connected to the center of the inverted U-shaped frame 18. The bottom end of the threaded rod 19 is rotatably provided with a support plate 20 through a bearing; abutting plates 21 are rotatably provided at the bottom ends of both side walls of the inverted U-shaped frame 18; wherein, sleeves 24 are fixed to the bottom ends of both side walls of the inverted U-shaped frame 18. A T-shaped rod 25 with one end passing through and extending below the sleeve 24 is provided at the top end of the sleeve 24. The abutting plate 21 is fixed to the bottom end of the T-shaped rod 25. The T-shaped rod 25 passes through the sleeve 24 and can rotate within the sleeve 24 and cannot escape.

[0028] As Figure 3 shown, when in use, first rotate a pair of abutting plates 21 of the fixing component outwards, then place the inverted U-shaped frame 18 in the annular bins 22 of two adjacent turnover barrels, and rotate the pair of abutting plates 21 in the reverse direction until they rotate below the corresponding horizontal metal rings 23. Press the inverted U-shaped frame 18 with one hand and rotate the threaded rod 19 with the other hand. The threaded rod 19 moves downward, driving the support plate 20 to abut against the top of the annular bin 22. Continue to rotate the threaded rod 19. Since the hand restricts the rotation of the inverted U-shaped frame 18 and makes it unable to rotate, it can move upward under the action of the threaded rod 19, thereby driving the abutting plate 21 to move upward and abut against and be clamped with the horizontal metal ring 23, and the fixation of the positions of two adjacent turnover barrels can be completed. Use the same method to fixedly connect multiple stacked turnover barrels in sequence to form a whole, making the multiple turnover barrels more stable during transportation and avoiding tipping during transportation.

[0029] To facilitate the handling of the barrel body 1, both sides of the barrel body 1 are recessed inward, and handrails 26 are rotatably arranged at the recessed parts. By rotating out the handrails 26 on both sides of the barrel body 1, the handling of the barrel body 1 can be conveniently realized.

[0030] The present invention adopts a fixing component to realize the fixed integral connection of multiple turnover barrels. Structures such as an inverted U-shaped frame and a threaded rod connect multiple turnover barrels into a whole, improving the transportation stability and making it less likely to tip during transportation.

[0031] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A turnover barrel for optoelectronic materials that is convenient for transportation, characterized in that, Comprising: A barrel body (1), on which a barrel cover (2) is provided. At least one liquid channel (3) is provided at the top end of the barrel cover (2), with one end penetrating through the barrel cover (2) and extending into the barrel body (1). An inner tube (4) is provided on the inner side of the top end of the liquid channel (3); A tube cap (5) which is threadedly connected to the top end of the inner tube (4); A fixing ring (6) which is fixed inside the liquid channel (3) and is located below the inner tube (4). The opposite inner ends of the fixing ring (6) and the inner tube (4) are respectively fixedly connected to the upper and lower edges of a sealing rubber sleeve (7). The middle cross-section of the sealing rubber sleeve (7) is semi-circular, and an annular rubber ring (8) is sleeved on the outer circumference of the middle part of the sealing rubber sleeve (7). An adjusting assembly for driving the inner tube (4) to move up and down is provided on the outer side of the liquid channel (3); Wherein, when the adjusting assembly drives the inner tube to move downward to squeeze the annular rubber ring (8) to deform inward, and then the middle part of the sealing rubber sleeve (7) expands inward, so as to be hermetically connected to the liquid injection tube or liquid extraction tube inserted into the liquid channel (3); when the adjusting assembly drives the inner tube to move upward to relax the extrusion of the annular rubber ring (8), the annular rubber ring (8) deforms and resets outward, and then relaxes the extrusion of the middle part of the sealing rubber sleeve (7), and the middle part of the sealing rubber sleeve (7) resets outward to reduce the extrusion of the liquid injection tube or liquid extraction tube, so as to facilitate the extraction of the liquid injection tube or liquid extraction tube.

2. The turnover barrel for optoelectronic materials convenient for transportation according to claim 1, wherein, The bottom end of the inner tube (4) and the top end of the fixing ring (6) are both set to be arc-shaped, so as to facilitate the annular rubber ring (8) to be received in the annular cavity between the inner tube (4) and the fixing ring (6).

3. The turnover barrel for optoelectronic materials convenient for transportation according to claim 1, characterized in that, Two liquid channels (3) are provided, namely a liquid injection tube (31) and a liquid extraction tube (32), and the liquid extraction tube (32) is longer than the liquid injection tube (31).

4. The turnover barrel for optoelectronic materials convenient for transportation according to claim 1, characterized in that The adjusting assembly includes a rotating tube (9) threadedly connected to the outer circumference of the top of the liquid channel (3), and the inner circumference of the top of the rotating tube (9) is rotatably connected to the inner tube (4) through a bearing; A limiting slider (10) is fixedly provided on the side of the inner tube (4), and a limiting sliding groove (11) slidably connected to the limiting slider (10) is provided on the inner wall of the liquid channel (3).

5. The turnover barrel for optoelectronic materials convenient for transportation according to claim 1, wherein A liquid level observation hole (12) is provided on the back of the barrel body (1), and a transparent cover plate (13) is fastened around the liquid level observation hole (12) by bolts, and a rectangular sealing ring (14) is embedded between the transparent cover plate (13) and the side wall of the barrel body (1).

6. The turnover barrel for optoelectronic materials convenient for transportation according to claim 1, wherein, Both sides of the barrel body (1) are recessed inward, and a handrail (26) is rotatably provided at the recessed part.

7. The turnover barrel for optoelectronic materials convenient for transportation according to any one of claims 1-6, characterized in that, A fixing assembly is provided on the outer side of the barrel cover (2). The fixing assembly includes an inverted U-shaped frame (18), a threaded rod (19) is threadedly connected in the center of the inverted U-shaped frame (18), and the bottom end of the threaded rod (19) is rotatably provided with a support plate (20) through a bearing; abutting plates (21) are rotatably provided at the bottom ends of both side walls of the inverted U-shaped frame (18); An annular chamber (22) is fixed to the top of the barrel cover (2), and a horizontal metal ring (23) is fixed to the inner wall of the annular chamber (22).

8. The turnover barrel for optoelectronic materials convenient for transportation according to claim 7, characterized in that, Both bottom ends of the two side walls of the inverted U-shaped frame (18) are fixedly provided with sleeves (24). A T-shaped rod (25) with one end penetrating and extending below the sleeve (24) is provided at the top end of the sleeve (24). The abutting plate (21) is fixed to the bottom end of the T-shaped rod (25).

9. The turnover barrel for optoelectronic materials convenient for transportation according to claim 1, wherein, The top end of the barrel body (1) is of an open structure and an external thread area is circumferentially arranged thereon. An internal thread area is arranged on the inner side wall of the barrel cover (2). The barrel cover (2) is threadedly connected to the top end of the barrel body (1). A sealing metal ring (15) is fixed to the inner top wall of the barrel cover (2). A sealing ring (16) abutted against the inner side of the top end of the barrel body (1) is fixed to the outer peripheral wall of the sealing metal ring (15). The outer side of the sealing ring (16) is of an inclined surface structure.

10. The turnover barrel for optoelectronic materials convenient for transportation according to claim 1, characterized in that A handle (17) is arranged at the top end of the barrel cover (2).

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