A brush for cleaning round bottom flasks

Abstract

This utility model discloses a brush for cleaning round-bottom flasks, including a handle, a rod, a piston plate, a spring, a first movable arm, a second movable arm, and first and second bristles. The rod is slidably disposed inside the handle and is reset by the piston plate and spring. The first and second movable arms are hinged to the handle and rod respectively, forming a retractable cleaning structure. The advantages and effects of this utility model are: in use, pressing the rod folds and retracts the first and second movable arms for easy insertion into the flask; after insertion, releasing the rod causes the first and second movable arms to automatically unfold under the action of the spring, allowing the first bristle to fit tightly against the spherical inner wall of the round-bottom flask, thus effectively solving the problems of traditional brushes not adhering tightly to the flask wall and having low cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of laboratory instrument technology, and in particular to a brush that facilitates cleaning of round-bottom flasks. Background Technology

[0002] Round-bottom flasks are commonly used chemical containers in laboratories. Currently, after use, round-bottom flasks require cleaning of their interiors with a brush. Existing brushes are typically fixed in a straight line. The cleaning method involves inserting the brush into the flask and rotating it or the flask to allow the brush to contact and rub against the inner wall, thus cleaning any adhering substances. However, in actual cleaning, the straight-line brush bristles struggle to fully conform to the curved surface of the round-bottom flask, making it difficult to thoroughly clean certain areas in one go. This necessitates repeated cleaning, making the process time-consuming and laborious. Utility Model Content

[0003] The purpose of this invention is to provide a brush that facilitates cleaning of round-bottom flasks, making the cleaning process easy and convenient.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a brush for cleaning round-bottom flasks, comprising a cylindrical brush handle, a circular cavity inside the brush handle, an upper sliding hole at the top of the brush handle and communicating with the circular cavity, a lower sliding hole at the bottom of the brush handle and communicating with the circular cavity, a brush rod that slides through the upper sliding hole and the lower sliding hole and passes through the circular cavity, a piston plate fixed in the middle of the brush rod and sliding inside the circular cavity, a spring movably sleeved on the brush rod and connected at both ends to the piston plate and the bottom of the circular cavity respectively, multiple movable arms with one end hinged to the brush handle, and multiple movable arms with one end hinged to the brush handle. The brush rod is connected to a movable arm 2, which is hinged to each movable arm 1 at the other end. Multiple bristles 1 are evenly distributed on the side of the movable arm 1 and movable arm 2 facing away from the brush rod. Multiple bristles 2 are evenly distributed on the lower end face of the brush rod. The length of the brush rod is greater than the length of the brush handle, and the head and tail of the brush rod extend out of the upper sliding hole and the lower sliding hole, respectively. The lengths of the movable arm 1 and movable arm 2 are equal. The hinge center of the movable arm 1 and the brush handle is close to the lower end of the brush handle, and the hinge center of the movable arm 2 and the brush rod is close to the lower end of the brush rod. When the spring is not deformed, the piston plate is close to the top of the circular sliding cavity, and the hinge centers of the movable arm 1 and movable arm 2 are far from the brush rod.

[0005] A further feature of this invention is that the brush handle includes a gripping part and a cleaning part, and the outer diameter of the gripping part is larger than the outer diameter of the cleaning part. The upper sliding hole and the circular cavity are located inside the gripping part, the lower sliding hole is located inside the cleaning part, and the end of the movable arm is hinged to the outer wall of the cleaning part.

[0006] A further feature of this invention is that the upper sliding hole includes an interconnected telescopic part and a connecting part, with the inner diameter of the telescopic part being larger than the inner diameter of the connecting part. The telescopic part connects the connecting part and the outside of the hole and is slidably inserted into a pressing cylinder. The connecting part connects the telescopic part and the circular cavity, and the brush rod slides through the connecting part. The pressing cylinder has a sealed top and an open bottom, and the brush rod slides into the pressing cylinder through this opening. The inner wall of the telescopic part has four vertically parallel straight grooves, with the lower ends of the four straight grooves being at the same height and the upper ends increasing or decreasing sequentially. The inner wall of the telescopic part has a ring-shaped connecting groove that connects the lower ends of the four straight grooves. The outer wall of the pressing cylinder is fixedly provided with a sliding protrusion, which slides in a straight groove or a connecting groove.

[0007] A further feature of this invention is that: the brush handle sidewall is provided with a water inlet connecting the circular sliding cavity and the outside, and the water inlet is close to the top of the circular sliding cavity; the brush handle sidewall is fixedly connected with a water supply pipe connecting the water inlet; the brush rod has a water supply channel inside; the brush rod sidewall is provided with a water inlet hole connecting the supply channel and the circular sliding cavity, and the water inlet hole is located above the piston plate; the brush rod sidewall is provided with a spray hole connecting the supply channel and the outside, and the spray hole is located in the gap between adjacent movable arm one or movable arm two; the water inlet and the inner wall of the water inlet are provided with a one-way valve assembly; when the piston plate moves downward, the one-way valve assembly on the inner wall of the water inlet does not block the water flow, while the one-way valve assembly on the inner wall of the water inlet blocks the water flow; when the piston plate moves upward, the one-way valve assembly on the inner wall of the water inlet blocks the water flow, while the one-way valve assembly on the inner wall of the water inlet does not block the water flow.

[0008] A further feature of this invention is that the one-way valve assembly includes a cross support frame with four heads fixedly connected to the inner wall of the inlet or inlet hole, a mounting hole opened in the center of the cross support frame, a rubber connector passing through and locked in the mounting hole, and a rubber disc fixedly connected to one end of the connector. The outer diameter of the rubber disc is equal to the inner diameter of the inlet or inlet hole. The rubber disc in the inlet is located on the side of the cross support frame near the circular sliding cavity, and the rubber disc in the inlet hole is located on the side of the cross support frame near the water flow channel.

[0009] A further feature of this invention is that the top surface of the piston plate is fixedly covered with an annular rubber water-blocking gasket, and an annular mounting groove is formed on the inner wall of the connecting part, with an annular rubber water-blocking ring embedded in the mounting groove.

[0010] The present invention is further configured as follows: the cross-sections of the first movable arm and the second movable arm are U-shaped and rectangular, respectively, and the second movable arm is located in the middle gap of the first movable arm; a hinge seat 1 is fixedly provided on the outer wall of the brush handle, extending into the middle gap of the first movable arm, and hinge shafts 1 are fixedly provided on both sides of the hinge seat 1, respectively moving through the side walls of the second movable arm; multiple pairs of hinge seats 2 are fixedly provided on the outer wall of the brush rod, and each pair of hinge seats 2 is parallel to each other, all the second movable arms are respectively parallel and located in the middle of each pair of hinge seats 2, and hinge shafts 2 are fixedly provided on both sides of the movable arm, respectively rotating through the two hinge seats 2; a hinge shaft 3 is rotatably provided on the first movable arm, and the hinge shaft 3 rotates through the second movable arm.

[0011] A further feature of this invention is that the hinge shaft includes a pair of disc-shaped limiting bodies, a tube fixed to one side of one limiting body, and multiple arc-shaped clamping plates fixed to one side of the other limiting body. The tube rotates through the movable arm one and the movable arm two. All the arc-shaped clamping plates and limiting bodies are coaxial and slide into the tube together. A protrusion is fixedly provided on the side of the arc-shaped clamping plate opposite to its axis. A groove is opened on the inner wall of the tube to fit the protrusion on the back of the arc-shaped clamping plate. When the protrusion on the back of the arc-shaped clamping plate and the groove on the inner wall of the tube are fitted together, the two limiting bodies are respectively close to both sides of the movable arm one. Brush bristles are evenly provided on the surface of the contour of the limiting body.

[0012] A further feature of this invention is that a vertical limiting groove is fixedly provided on the inner wall of the sliding hole, and a limiting protrusion that slides in the limiting groove is provided on the lower half side of the piston plate of the brush rod.

[0013] A further feature of this invention is that a support disc is fixedly provided at the lower end of the brush rod, and the bottom of the support disc is a convex arc surface, with the brush bristles evenly distributed on the convex arc surface.

[0014] The beneficial effects of this utility model are:

[0015] 1. By setting up a telescopic brush rod, movable arm one and movable arm two, and cooperating with a spring reset mechanism, the brush bristles can automatically unfold and closely fit the spherical inner wall of the round-bottom flask, achieving a one-time comprehensive cleaning, significantly improving cleaning efficiency and reducing repetitive operations.

[0016] 2. By setting up a water inlet, water delivery channel, water spray hole and one-way valve assembly, it can automatically draw in and spray cleaning liquid during the brushing process, enhancing the stain removal effect, and is especially suitable for cleaning stubborn stains. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0019] Figure 2 This is a cross-sectional view of this embodiment;

[0020] Figure 3 This is an exploded view of this embodiment;

[0021] Figure 4 yes Figure 2 Enlarged view of point A;

[0022] Figure 5 This is a schematic diagram of the structure of hinge shaft three in this embodiment;

[0023] In the diagram, 1. Brush handle; 11. Grip part; 12. Cleaning part; 13. Water inlet; 14. Hinge seat one; 15. Hinge shaft one; 2. Circular sliding cavity; 3. Upper sliding hole; 31. Telescopic part; 311. Straight groove; 312. Connecting groove; 32. Connecting part; 321. Mounting groove; 322. Rubber water-blocking ring; 4. Lower sliding hole; 41. Limiting groove; 5. Brush rod; 51. Water delivery channel; 52. Water inlet; 53. Spray hole; 54. Hinge seat two; 55. Limiting protrusion; 56. Support disc; 6. Movable 61. Plug plate; 7. Rubber water-blocking gasket; 8. Spring; 9. Movable arm one; 10. Movable arm two; 11. Hinge shaft two; 12. Brush one; 13. Brush two; 14. Water supply pipe; 15. Pressing cylinder; 16. Sliding protrusion; 17. One-way valve assembly; 18. Cross support frame; 19. Mounting hole; 10. Rubber connector; 11. Rubber disc; 12. Hinge shaft three; 13. Limiting body; 14. Pipe body; 15. Arc-shaped clamping plate; 16. Groove; 17. Protrusion; 18. Brush three. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] Example: A brush for easy cleaning of round-bottom flasks, such as Figure 1-5As shown, the brush includes a cylindrical brush handle 1, a circular sliding cavity 2 inside the brush handle 1, an upper sliding hole 3 at the top of the brush handle 1 and communicating with the circular sliding cavity 2, a lower sliding hole 4 at the bottom of the brush handle 1 and communicating with the circular sliding cavity 2, a brush rod 5 that slides through the upper sliding hole 3 and the lower sliding hole 4 and passes through the circular sliding cavity 2, a piston plate 6 fixed in the middle of the brush rod 5 and sliding inside the circular sliding cavity 2, a spring 7 movably sleeved on the brush rod 5 and connected at both ends to the piston plate 6 and the bottom of the circular sliding cavity 2 respectively, multiple movable arms 8 that are hinged to the brush handle 1 at one end, and multiple movable arms 8 that are hinged to the brush rod 5 at one end and respectively hinged to each movable arm 8 at the other end. The brush rod has two movable arms, 9 and 10. Multiple bristles are evenly arranged on the side of movable arms 1 and 2 that are opposite to the brush rod 5. Multiple bristles are evenly arranged on the lower end face of the brush rod 5. The length of the brush rod 5 is greater than the length of the brush handle 1. The head and tail of the brush rod 5 extend out of the upper sliding hole 3 and the lower sliding hole 4, respectively. The lengths of movable arms 1 and 2 are equal. The hinge center of movable arm 1 and brush handle 1 is close to the lower end of brush handle 1. The hinge center of movable arm 2 and brush rod 5 is close to the lower end of brush rod 5. When the spring 7 is not deformed, the piston plate 6 is close to the top of the circular sliding cavity 2. The hinge centers of movable arms 1 and 2 are far away from the brush rod 5.

[0026] By adopting the above technical solution, when cleaning a round-bottom flask, first hold the brush handle 1 and press down on the brush rod 5 at the top of the handle 1 with your thumb. This causes the head of the brush rod 5 to retract into the upper sliding hole 3, the tail of the brush rod 5 to extend out of the lower sliding hole 4, and the piston plate 6 to compress the spring 7 inside the circular sliding cavity 2. Since the other ends of the movable arms 1 and 2 are hinged to each other, respectively, as the tail of the brush rod 5 extends out of the lower sliding hole 4, the movable arms 1 and 2 will rotate relative to the handle 1 and the brush rod 5, and the hinged ends of the movable arms 1 and 2 will move closer to the handle 1 and the brush rod 5, thus achieving the effect of folding and retracting the movable arms 1 and 2. Next, insert the brush rod 5 and the folded movable arms 1 and 2 into the round-bottom flask, ensuring that the movable arms 1 and 2 are located in the long neck of the round-bottom flask. At this time, the experimenter can rotate the round-bottom flask. The brush bristles 10 on the back of the movable arms 8 and 9 are used to clean the long neck opening. After cleaning the long neck opening, the brush handle 5 and the folded movable arms 8 and 9 are inserted into the round-bottom flask until they are inside the spherical cavity of the flask and the brush bristles 1a at the lower end of the brush handle 5 are in contact with the bottom of the spherical cavity. Then, the thumb releases the brush handle 5 at the top, and the spring 7 inside the circular sliding cavity 2 immediately returns to its original position, pushing the piston plate 6 upward. This causes the head of the brush handle 5 to extend out of the upper sliding hole 3 and the tail of the brush handle 5 to retract into the lower sliding hole 4. The movable arms 8 and 9 then unfold inside the round-bottom flask, allowing the brush bristles 10 on their backs to fully contact and adhere to the inner wall of the spherical cavity. Finally, the round-bottom flask or the brush handle 1 and brush handle 5 are rotated again to allow the brush bristles 10 and 1a to thoroughly and quickly clean the spherical cavity of the round-bottom flask.

[0027] Furthermore, the brush handle 1 includes a gripping portion 11 and a cleaning portion 12, with the outer diameter of the gripping portion 11 being larger than the outer diameter of the cleaning portion 12. The upper sliding hole 3 and the circular cavity are located inside the gripping portion 11, and the lower sliding hole 4 is located inside the cleaning portion 12. The end of the movable arm 8 is hinged to the outer wall of the cleaning portion 12. By employing the thicker gripping portion 11 of the brush handle 1, the experimenter can hold the brush handle 1 stably; by employing the thinner cleaning portion 12 of the brush handle 1, the brush handle 1 can easily pass through the narrow, long neck of the round-bottom flask.

[0028] Furthermore, the upper sliding hole 3 includes an interconnected telescopic part 31 and a connecting part 32, and the inner diameter of the telescopic part 31 is larger than the inner diameter of the connecting part 32. The telescopic part 31 connects the connecting part 32 and the outside of the hole, and a pressing cylinder 1c is slidably inserted therein. The connecting part 32 connects the telescopic part 31 and the circular cavity, and the brush rod 5 slides through the connecting part 32. The top of the pressing cylinder 1c is sealed and the bottom is open, and the brush rod 5 slides into the inside of the pressing cylinder 1c through this opening. The inner wall of the telescopic part 31 has four vertical parallel straight grooves 311, and the lower ends of the four straight grooves 311 are at the same height, and the upper ends increase or decrease in height sequentially. The inner wall of the telescopic part 31 has a ring-shaped connecting groove 312 that connects the lower ends of the four straight grooves 311. A sliding protrusion 1c1 is fixedly provided on the outer wall of the pressing cylinder 1c, and the sliding protrusion 1c1 slides in a straight groove 311 or a connecting groove 312.

[0029] By adopting the above technical solution, when it is necessary to press the head of the brush rod 5, only the pressing cylinder 1c needs to be pressed; when it is necessary to adapt to round-bottom flasks of different sizes, first press the pressing cylinder 1c, so that the sliding protrusion 1c1 of the pressing cylinder 1c slides in the communicating groove 312, then rotate the pressing cylinder 1c, so that the sliding protrusion 1c1 slides to the bottom of the straight groove 311 of the required length, then release the pressing cylinder 1c, and the sliding protrusion 1c1 will enter the straight groove 311 and quickly slide to the end of the straight groove 311. Since the top height of each straight groove 311 is different, when switching the sliding protrusion 1c1 to the straight groove 311, the sliding protrusion 1c1 will slide into the straight groove 311. After the groove 311 is inserted, the maximum length of the extension part 31 of the pressing cylinder 1c can be adjusted. Since the brush rod 5 extends into the pressing cylinder 1c and the top of the brush rod 5 is restricted by the top of the pressing cylinder 1c, adjusting the maximum length of the extension part 31 of the pressing cylinder 1c can adjust the maximum length of the brush rod 5 head extending out of the upper sliding hole 3 and the maximum length of the brush rod 5 tail retracting into the lower sliding hole 4. The unfolding of the movable arm 1 8 and the movable arm 2 9 is mainly achieved by the movement of the brush rod 5 tail retracting into the lower sliding hole 4. Therefore, adjusting the maximum length of the brush rod 5 tail retracting into the lower sliding hole 4 also adjusts the unfolding degree of the movable arm 1 8 and the movable arm 2 9, thereby adapting to round bottom flasks of different sizes.

[0030] Furthermore, the brush handle 1 has a water inlet 13 on its side wall, connecting the circular sliding cavity 2 to the outside, and the water inlet 13 is close to the top of the circular sliding cavity 2. A water supply pipe 1b connecting the water inlet 13 is fixedly connected to the side wall of the brush handle 1. The brush rod 5 has a water supply channel 51 inside, and a water inlet 52 connecting the supply channel and the circular sliding cavity 2 is provided on the side wall of the brush rod 5. The water inlet 52 is located above the piston plate 6, and a water spray hole 53 connecting the supply channel and the outside is provided on the side wall of the brush rod 5. Furthermore, the spray hole 53 is located in the gap between adjacent movable arms 1 8 or 2 9. The inner walls of the inlet 13 and the inlet hole 52 are equipped with one-way valve assembly 1d. When the piston plate 6 moves downward, the one-way valve assembly 1d on the inner wall of the inlet 13 does not block the water flow, while the one-way valve assembly 1d on the inner wall of the inlet hole 52 blocks the water flow. When the piston plate 6 moves upward, the one-way valve assembly 1d on the inner wall of the inlet 13 blocks the water flow, while the one-way valve assembly 1d on the inner wall of the inlet hole 52 does not block the water flow.

[0031] By adopting the above technical solution, when the head of the brush rod 5 is pressed down, the piston plate 6 will slide downward relative to the circular slide cavity 2, and through the water supply pipe 1b and the water inlet 13 (at this time, only the one-way valve inside the water inlet 13 does not block the water flow), a certain amount of cleaning liquid is drawn from the outside into the circular slide cavity 2 (the principle is the same as the structure of a syringe); then the head of the brush rod 5 is released, and the spring 7 will push the piston plate 6 to slide upward relative to the circular slide cavity 2. Since the one-way valve assembly 1d on the inner wall of the water inlet 13 blocks the water flow and the one-way valve assembly 1d on the inner wall of the water inlet 52 does not block the water flow, the cleaning liquid previously drawn into the circular slide cavity 2 will be injected into the spherical inner cavity of the round-bottom flask through the water inlet 52, the water supply channel 51 and the spray hole 53, so as to enhance the cleaning effect of the bristles 10 and 1a.

[0032] Furthermore, the one-way valve assembly 1d includes a cross support frame 1d1 fixedly connected to the inner wall of the inlet 13 or the inlet hole 52, a mounting hole 1d2 opened in the center of the cross support frame 1d1, a rubber connector 1d3 passing through and locked in the mounting hole 1d2, and a rubber disc 1d4 fixedly connected to one end of the connector. The outer diameter of the rubber disc 1d4 is equal to the inner diameter of the inlet 13 or the inlet hole 52. The rubber disc 1d4 in the inlet 13 is located on the side of the cross support frame 1d1 near the circular sliding cavity 2, and the rubber disc in the inlet hole 52 is located on the side of the cross support frame 1d1 near the water delivery channel 51.

[0033] By employing the aforementioned one-way valve assembly 1d, when the piston plate 6 slides downward relative to the circular slide cavity 2, a certain negative pressure is generated. The rubber disc 1d4 inside the inlet 13 is affected by the negative pressure and bends and deforms towards the circular slide cavity 2. The water flow inside the water pipe 1b enters the circular slide cavity 2 through the gap between the cross support frame 1d1 and the deformed rubber disc 1d4 inside the inlet 13. When the piston plate 6 slides upward relative to the circular slide cavity 2, it squeezes the cleaning fluid in the circular slide cavity 2. The rubber disc 1d4 inside the inlet hole 52 bends and deforms towards the water flow channel 51 under the pressure of the cleaning fluid. The cleaning fluid that has nowhere to be released enters the water flow channel 51 through the gap between the cross support frame 1d1 and the deformed rubber disc 1d4 inside the inlet hole 52. Among them, the cross support frame 1d1 inside the water inlet 13 can prevent the rubber disc 1d4 from deforming towards the water supply pipe 1b, thus preventing the cleaning liquid from being discharged from the water inlet 13; the cross support frame 1d1 inside the water inlet hole 52 can prevent the rubber disc 1d4 from deforming towards the circular sliding cavity 2, thus preventing the cleaning liquid from being sucked back into the circular sliding cavity 2.

[0034] Furthermore, an annular rubber water-blocking gasket 61 is fixedly covered on the top surface of the piston plate 6, and an annular mounting groove 321 is formed on the inner wall of the connecting part 32, with an annular rubber water-blocking ring 322 embedded in the mounting groove 321. By using the aforementioned rubber water-blocking gasket 61 and rubber water-blocking ring 322, the airtightness of the area of ​​the circular sliding cavity 2 above the piston plate 6 can be improved to prevent cleaning fluid leakage and ensure long-term reliable use of the equipment.

[0035] Furthermore, the cross-sections of movable arm 8 and movable arm 9 are U-shaped and rectangular, respectively, and movable arm 9 is located in the middle gap of movable arm 8; a hinge seat 14 is fixedly provided on the outer wall of brush handle 1, extending into the middle gap of movable arm 8, and hinge shafts 15 are fixedly provided on both sides of hinge seat 14, respectively moving through the side walls of movable arm 9; multiple pairs of hinge seats 2 54 are fixedly provided on the outer wall of brush rod 5, and each pair of hinge seats 2 54 is parallel to each other, all movable arms 2 9 are respectively parallel and located in the middle of each pair of hinge seats 2 54, and hinge shafts 2 91 are fixedly provided on both sides of movable arm, respectively rotating through the two hinge seats 2 54; a hinge shaft 3 1e is rotatably provided on movable arm 8, and hinge shaft 3 1e rotates through movable arm 9. By adopting the above technical solution, not only can the hinged connection between movable arm 1 and brush handle 1, movable arm 2 and brush rod 5, and movable arm 1 and movable arm 2 9 be effectively realized, but also the movable arm 1 has a U-shaped cross section and the movable arm 2 9 has a rectangular cross section, which can save space by nesting them together.

[0036] Furthermore, the hinge shaft 1e includes a pair of disc-shaped limiting bodies 1e1, a tube 1e2 fixed to one side of one limiting body 1e1, and multiple arc-shaped clamping plates 1e3 fixed to one side of the other limiting body 1e1. The tube 1e2 rotates through the movable arm 8 and the movable arm 9. All the arc-shaped clamping plates 1e3 and the limiting bodies 1e1 are coaxial and slide into the tube 1e2 together. A protrusion 1e5 is fixedly provided on the side of the arc-shaped clamping plate 1e3 opposite to its axis. A groove 1e4 is opened on the inner wall of the tube 1e2 to fit the protrusion 1e5 on the back of the arc-shaped clamping plate 1e3. When the protrusion 1e5 on the back of the arc-shaped clamping plate 1e3 and the groove 1e4 on the inner wall of the tube 1e2 are fitted, the two limiting bodies 1e1 are respectively close to the two sides of the movable arm 8. Brush bristles 1e6 are evenly provided on the surface of the contour of the limiting body 1e1. By adopting the above technical solution, not only can the hinge shaft 31e be easily assembled and disassembled, but the bristles 31e6 on the outer contour surface of the limiting body 1e1 can also make up for the cleaning dead corners of the back bristles 10 of the movable arm 18 and the movable arm 29.

[0037] Furthermore, a vertical limiting groove 41 is fixedly provided on the inner wall of the sliding hole 4, and a limiting protrusion 55 that slides in the limiting groove 41 is provided on the lower half side of the piston plate 6 of the brush rod 5. By using the above-mentioned limiting groove 41 and limiting protrusion 55, the relative rotation of the brush rod 5 and the brush handle 1 can be effectively locked to avoid damage to the movable arm 8 and the movable arm 9 due to torsion.

[0038] Furthermore, a support disc 56 is fixedly provided at the lower end of the brush rod 5, and the bottom of the support disc 56 is a convex arc surface, with the second bristles 1a evenly distributed on the convex arc surface. By using the support disc 56, the area at the lower end of the brush rod 5 can be increased to accommodate more second bristles 1a, ensuring that the bottom of the round-bottom flask is thoroughly cleaned.

Claims

1. A brush for easy cleaning of round-bottom flasks, characterized in that, Includes a cylindrical brush handle (1), a circular sliding cavity (2) inside the brush handle (1), an upper sliding hole (3) at the top of the brush handle (1) and connected to the circular sliding cavity (2), a lower sliding hole (4) at the bottom of the brush handle (1) and connected to the circular sliding cavity (2), a brush rod (5) that slides through the upper sliding hole (3) and the lower sliding hole (4) and passes through the circular sliding cavity (2), a piston plate (6) fixed in the middle of the brush rod (5) and sliding inside the circular sliding cavity (2), a spring (7) movably sleeved on the brush rod (5) and connected at both ends to the piston plate (6) and the bottom of the circular sliding cavity (2) respectively, multiple movable arms one (8) with one end hinged to the brush handle (1), and multiple movable arms two (8) with one end hinged to the brush rod (5) and the other end hinged to each movable arm one (8) respectively. 9) Multiple bristles 1 (10) are evenly arranged on the side of the connecting movable arm 1 (8) and movable arm 2 (9) facing away from the brush rod (5), and multiple bristles 2 (1a) are evenly arranged on the lower end face of the brush rod (5). The length of the brush rod (5) is greater than the length of the brush handle (1), and the head and tail of the brush rod (5) extend out of the upper sliding hole (3) and the lower sliding hole (4) respectively. The lengths of the movable arm 1 (8) and movable arm 2 (9) are equal, and the hinge center of the movable arm 1 (8) and the brush handle (1) is close to the lower end of the brush handle (1), and the hinge center of the movable arm 2 (9) and the brush rod (5) is close to the lower end of the brush rod (5). When the spring (7) is not deformed, the piston plate (6) is close to the top of the circular sliding cavity (2), and the hinge center of the movable arm 1 (8) and movable arm 2 (9) is far away from the brush rod (5).

2. The brush for cleaning round-bottom flasks according to claim 1, characterized in that: The brush handle (1) includes a grip (11) and a cleaning part (12), and the outer diameter of the grip (11) is larger than the outer diameter of the cleaning part (12). The upper sliding hole (3) and the circular cavity are located inside the grip (11), the lower sliding hole (4) is located inside the cleaning part (12), and the end of the movable arm (8) is hinged to the outer wall of the cleaning part (12).

3. The brush for cleaning round-bottom flasks according to claim 2, characterized in that: The upper sliding hole (3) includes a telescopic part (31) and a connecting part (32) that are interconnected. The inner diameter of the telescopic part (31) is larger than the inner diameter of the connecting part (32). The telescopic part (31) connects the connecting part (32) and the outside of the hole, and a pressing cylinder (1c) is slidably inserted therein. The connecting part (32) connects the telescopic part (31) and the circular cavity, and the brush rod (5) slides through the connecting part (32). The top of the pressing cylinder (1c) is sealed and the bottom is open, and the brush rod (5) slides into the pressing cylinder (1c) through this opening. Inside the telescopic part (31), four vertical parallel straight grooves (311) are provided on the inner wall, and the lower ends of the four straight grooves (311) are at the same height and the upper ends increase or decrease sequentially. A ring-shaped connecting groove (312) is provided on the inner wall of the telescopic part (31) and connects the lower ends of the four straight grooves (311). A sliding protrusion (1c1) is fixedly provided on the outer wall of the pressing cylinder (1c), and the sliding protrusion (1c1) slides in a straight groove (311) or a connecting groove (312).

4. The brush for cleaning round-bottom flasks according to claim 3, characterized in that: The brush handle (1) has a water inlet (13) on its side wall that connects the circular sliding cavity (2) to the outside, and the water inlet (13) is close to the top of the circular sliding cavity (2). The brush handle (1) has a water supply pipe (1b) fixedly connected to the side wall that connects the water inlet (13). The brush rod (5) has a water supply channel (51) inside. The brush rod (5) has a water inlet (52) on its side wall that connects the supply channel and the circular sliding cavity (2), and the water inlet (52) is located above the piston plate (6). The brush rod (5) has a spray hole (53) on its side wall that connects the supply channel and the outside. The spray hole (53) is located in the gap between adjacent movable arm one (8) or movable arm two (9). The inner walls of the inlet (13) and the inlet hole (52) are provided with one-way valve assembly (1d). When the piston plate (6) moves downward, the one-way valve assembly (1d) on the inner wall of the inlet (13) does not block the water flow, and the one-way valve assembly (1d) on the inner wall of the inlet hole (52) blocks the water flow. When the piston plate (6) moves upward, the one-way valve assembly (1d) on the inner wall of the inlet (13) blocks the water flow, and the one-way valve assembly (1d) on the inner wall of the inlet hole (52) does not block the water flow.

5. A brush for cleaning round-bottom flasks according to claim 4, characterized in that: The one-way valve assembly (1d) includes a cross support frame (1d1) fixedly connected to the inner wall of the inlet (13) or the inlet hole (52), a mounting hole (1d2) opened in the center of the cross support frame (1d1), a rubber connector (1d3) passing through and locked in the mounting hole (1d2), and a rubber disc (1d4) fixedly connected to one end of the connector. The outer diameter of the rubber disc (1d4) is equal to the inner diameter of the inlet (13) or the inlet hole (52). The rubber disc (1d4) in the inlet (13) is located on the side of the cross support frame (1d1) near the circular sliding cavity (2), and the rubber disc in the inlet hole (52) is located on the side of the cross support frame (1d1) near the water conveying channel (51).

6. A brush for cleaning round-bottom flasks according to claim 5, characterized in that: The top surface of the piston plate (6) is fixedly covered with a layer of annular rubber water-blocking gasket (61), and an annular mounting groove (321) is opened on the inner wall of the connecting part (32), and an annular rubber water-blocking ring (322) is embedded in the mounting groove (321).

7. A brush for cleaning round-bottom flasks according to claim 6, characterized in that: The cross-sections of the first movable arm (8) and the second movable arm (9) are U-shaped and rectangular, respectively, and the second movable arm (9) is located in the middle gap of the first movable arm (8); the outer wall of the brush handle (1) is fixedly provided with a hinge seat (14) extending into the middle gap of the first movable arm (8), and the two sides of the hinge seat (14) are fixedly provided with hinge shafts (15) that move through the two side walls of the second movable arm (9); the outer wall of the brush rod (5) is fixedly provided with multiple pairs of hinge seats (54), and each pair of hinge seats (54) is parallel to each other. All the second movable arms (9) are located parallel to each pair of hinge seats (54) in the middle, and the two sides of the movable arm are fixedly provided with hinge shafts (91) that rotate through the two hinge seats (54); the first movable arm (8) is rotatably provided with a hinge shaft (1e), and the hinge shaft (1e) rotates through the second movable arm (9).

8. A brush for cleaning round-bottom flasks according to claim 7, characterized in that: The hinge shaft three (1e) includes a pair of disc-shaped limiting bodies (1e1), a tube (1e2) fixed to one side of one limiting body (1e1), and multiple arc-shaped clamping plates (1e3) fixed to one side of the other limiting body (1e1). The tube (1e2) rotates through the movable arm one (8) and the movable arm two (9). All the arc-shaped clamping plates (1e3) and the limiting bodies (1e1) are coaxial and slide together inside the tube (1e2). A protrusion (1e5) is fixedly provided on the side opposite to its axis. The inner wall of the tube (1e2) is provided with a groove (1e4) for fitting the protrusion (1e5) on the back of an arc-shaped card plate (1e3). When the protrusion (1e5) on the back of the arc-shaped card plate (1e3) and the groove (1e4) on the inner wall of the tube (1e2) are fitted together, the two limiting bodies (1e1) are respectively close to the two sides of the movable arm (8). Brush bristles (1e6) are evenly provided on the surface of the contour of the limiting body (1e1).

9. A brush for cleaning round-bottom flasks according to claim 1, characterized in that: The inner wall of the sliding hole (4) is fixedly provided with a vertical limiting groove (41), and the brush rod (5) is provided with a limiting protrusion (55) that slides in the limiting groove (41) on the lower half side of the piston plate (6).

10. A brush for cleaning round-bottom flasks according to claim 1, characterized in that: The lower end of the brush rod (5) is fixedly provided with a support disc (56), and the bottom of the support disc (56) is a circular arc convex surface, and the brush bristles (1a) are evenly arranged on the circular arc convex surface.

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