Liftable workbench of electronic product assembly line

Abstract

The invention discloses a liftable working table of an electronic product assembly line, and belongs to the technical field of workshop equipment, the liftable working table comprises a movable base, guide rails are symmetrically mounted on the movable base, a lifting frame is movably arranged between the two guide rails, a table top is rotatably mounted at the top of the lifting frame, and a mounting frame is fixed on one side of the table top; a filter cartridge is placed on the mounting frame, a smoke suction cover is connected to the side wall of the filter cartridge through a gooseneck pipe, and a smoke suction pipe is connected between the smoke suction cover and the filter cartridge; a rotating shaft is rotationally mounted between the inner walls of the two sides of the filter cartridge, a first filter layer, a second filter layer and a third filter layer are sequentially arranged on the rotating shaft, and a ratchet wheel is mounted on the rotating shaft; the workbench is convenient to lift and adjust, has a purification function, effectively adsorbs and purifies smoke generated by welding when an electronic product is welded and assembled, improves the utilization rate of the filter layer, and ensures the purification effect.

Description

Technical Field

[0001] This invention relates to the field of workshop equipment technology, and more specifically to a liftable workbench for an electronic product assembly line. Background Technology

[0002] In the field of electronic product assembly, height-adjustable workbenches have become fundamental equipment for core processes such as welding and component assembly because they can adapt to different operator heights and meet the assembly height requirements of various product specifications. Among them, the welding process (such as PCB board pin soldering and chip soldering) is a critical link in electronic product assembly. However, in this process, the high-temperature melting of solder alloys (containing tin, lead, or silver, etc.) and the volatilization of flux (mainly composed of rosin and organic acids) will produce harmful fumes containing tiny metal particles, volatile organic compounds, and acidic gases. If these fumes permeate the operating area for a long time, they will not only irritate the respiratory mucosa of operators and lead to the risk of heavy metal inhalation, but may also adhere to the surface of electronic components, affecting assembly accuracy and product yield. Therefore, fume purification has become a core functional requirement for height-adjustable workbenches to adapt to welding scenarios.

[0003] To address the aforementioned issues, existing technologies have introduced improved solutions by adding smoke extraction devices to height-adjustable workbenches. While these devices can achieve initial smoke collection and purification, they still suffer from key drawbacks in practical applications, such as low filter layer utilization and rapid local saturation. Specific problems are as follows: The existing fumigation devices mostly adopt a "fixed cavity + layered filter" structure. After the smoke driven by the air intake component is drawn into the fumigation hood, it will directly impact a specific area of ​​the filter layer (usually the center of the filter or a local position directly opposite the airflow inlet) along the fixed airflow channel. Since the smoke generation points of the welding process are relatively concentrated (such as operators welding in a fixed area of ​​the workbench), the inhaled smoke airflow is always focused on the same contact point of the filter layer, causing this area to continuously bear the main adsorption and filtration load, while the adsorption capacity of the filter edge and other non-contact areas is idle for a long time.

[0004] On the one hand, rapid local saturation of the filter layer can significantly shorten the overall lifespan of the filter. On the other hand, local saturation can lead to the risk of "smoke penetration"—when the local adsorption of the filter layer reaches its limit, the unadsorbed harmful smoke will break through the filter from the saturated area and re-diffuse into the operating environment, causing the smoke purification efficiency to plummet from over 85% to below 40%, threatening the occupational health of operators. In addition, if a locally saturated filter is not replaced in time, the accumulation of adsorbed organic matter may pose a risk of spontaneous combustion in high-temperature environments, increasing the safety risks on the assembly line. Summary of the Invention

[0005] The purpose of this invention is to provide a liftable workbench for electronic product assembly lines, which solves the following technical problems: Existing liftable workbench generally cannot handle the fumes generated during welding. Even if a fumigation device is installed, the fixed airflow path results in a fixed contact area of ​​the filter layer and localized rapid saturation, leading to low filter utilization, high consumable costs, and unstable purification effects, making it difficult to meet the needs of electronic product assembly lines for efficient, economical, and safe fumigation treatment.

[0006] The objective of this invention can be achieved through the following technical solutions: A liftable workbench for an electronic product assembly line includes a movable base, guide rails symmetrically mounted on the movable base, a lifting frame movably arranged between the two guide rails, a tabletop rotatably mounted on the top of the lifting frame, a mounting frame fixed on one side of the tabletop, a filter cartridge placed on the mounting frame, a fumigation hood connected to the side wall of the filter cartridge via a gooseneck tube, and a fumigation pipe connected between the fumigation hood and the filter cartridge. A rotating shaft is rotatably mounted between the inner walls of both sides of the filter cylinder. A first filter layer, a second filter layer, and a third filter layer are sequentially arranged on the rotating shaft. A ratchet is mounted on the rotating shaft and is located between the first filter layer and the second filter layer. A hollow rod is fixed on the filter cylinder. A first spring is connected inside the hollow rod. One end of the first spring is connected to a piston rod. One end of the piston rod passes through the bottom of the hollow rod and is connected to a driven rod. Multiple ratchet teeth are rotatably mounted on the side of the driven rod near the ratchet. A tension spring is provided between the ratchet teeth and the driven rod. Multiple limiting blocks corresponding to the ratchet teeth are provided on the driven rod. An exhaust port is opened on the side wall of the hollow rod near the first filter layer. A mounting plate is fixed to one side of the movable base, and a purification box is set above the mounting plate. One end of the return pipe of the purification box is connected to the hollow rod, and the end of the filter cartridge away from the smoke pipe is connected to the air outlet pipe. One end of the air outlet pipe is connected to the purification box.

[0007] As a further aspect of the present invention: the first filter layer is made of nylon mesh, the second filter layer is made of activated carbon mesh, and the third filter layer is made of HEPA high-efficiency filter.

[0008] As a further aspect of the present invention: the air outlet pipe extends into the interior of the purification chamber, and a plurality of air distribution holes are provided at one end of the air outlet pipe extending into the purification chamber.

[0009] As a further embodiment of the present invention: the top of the purification box is connected to an inlet pipe, one end of which is connected to an external reagent source, and the other end extends into the purification box and is rotatably mounted with a spray disc. A three-way pipe is connected to the top wall of the purification box, and an air intake fan is installed at one end of the three-way pipe inside the purification box. One end of the return pipe is connected to one port of the three-way pipe, and an exhaust pipe is connected to the third port of the three-way pipe.

[0010] As a further aspect of the present invention: a toothed ring is fixed on the outer wall of the spray disc, a motor is installed on the top wall of the purification box, the output shaft of the motor extends into the purification box and a gear is installed thereon, and the gear meshes with the toothed ring.

[0011] As a further embodiment of the present invention: a push rod is fixed to the top of the spray disc, and an L-shaped movable rod is movably arranged on the side wall of the three-way pipe. A push block is fixed to one end of the movable rod, and a sealing block is fixed to the other end. A second spring is connected between the movable rod and the inner wall of the three-way pipe. The cross-sections of the push rod and the push block are both semi-circular.

[0012] As a further aspect of the present invention: both the exhaust pipe and the return pipe are flexible hoses, and a drain pipe with a valve is connected to the bottom wall of the purification box.

[0013] The beneficial effects of this invention are: (1) The present invention has a lifting and adjusting function on the workbench and the table surface can be rotated, which is convenient for the assembly and use of electronic products. It also adopts a multi-stage purification function. The first filter layer in the filter cylinder filters the solder slag and other particles generated during welding to prevent clogging of the subsequent filter layers. The second filter layer adsorbs the organic volatiles in the smoke, such as rosin acid and flux volatile gases, and removes irritating odors. The third filter layer filters the fine particles, such as lead, tin and other heavy metal dust. The purification box performs the final purification to ensure that the gas emitted will not pollute the environment or harm the health of the workers. (2) By setting up a return pipe, the purified gas returns to the hollow rod. With the piston rod, ratchet and ratchet, the ratchet and rotating shaft can be driven to rotate periodically, so that multiple filter layers can rotate periodically, so that the smoke can evenly contact different areas of the filter layer. Its adsorption and filtration area are fully utilized, avoiding the waste problem of "partial failure and overall abandonment". (3) By setting an exhaust port on the hollow rod, when the piston rod is pushed to the bottom of the exhaust port by the air pressure, the gas in the hollow rod is discharged through the exhaust port. The piston rod is automatically reset under the action of the first spring, and the discharged gas is blown towards the first filter layer. Large particulate impurities attached to the first filter layer can be blown off in the opposite direction at regular intervals, maintaining the air permeability of the first filter layer, avoiding airflow attenuation from affecting the smoke capture efficiency, and ensuring that the entire device is in a high-efficiency operating state for a long time. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a first-view structural diagram of the entire invention; Figure 2 This is a second-view structural diagram of the entire invention; Figure 3 This is a schematic diagram of the internal structure of the filter cartridge of the present invention; Figure 4 This is a structural schematic diagram of the ratchet and ratchet teeth of the present invention; Figure 5 This is a schematic diagram of the internal structure of the hollow rod in this invention; Figure 6 This is a three-dimensional structural diagram of the purification box of the present invention; Figure 7 This is a schematic diagram of the internal structure of the purification box of the present invention; Figure 8 This is a three-dimensional structural diagram of the spray disc of the present invention.

[0016] In the diagram: 1. Movable base; 2. Guide rail; 3. Lifting frame; 4. Platform; 5. Mounting bracket; 6. Filter cartridge; 601. Rotating shaft; 602. First filter layer; 603. Second filter layer; 604. Third filter layer; 605. Ratchet; 606. Hollow rod; 607. First spring; 608. Piston rod; 609. Followed rod; 610. Racket tooth; 611. Exhaust port; 612. Air outlet. 7. Gooseneck pipe; 8. Fume hood; 9. Fume pipe; 10. Mounting plate; 11. Purification box; 12. Return pipe; 13. T-pipe; 14. Exhaust pipe; 15. Liquid inlet pipe; 16. Spray disc; 17. Push rod; 18. Gear ring; 19. Motor; 20. Gear; 21. Suction fan; 22. Movable rod; 23. Push block; 24. Sealing block; 25. Second spring; 26. Drain pipe.

[0017] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual size and shape of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 5As shown, this invention is a liftable workbench for an electronic product assembly line. The liftable workbench includes a movable base 1, with guide rails 2 symmetrically mounted on the movable base 1. A lifting frame 3 is movably arranged between the two guide rails 2. A tabletop 4 is rotatably mounted on the top of the lifting frame 3. A mounting bracket 5 is fixed to one side of the tabletop 4. A filter cylinder 6 is placed on the mounting bracket 5. A fumigation hood 8 is connected to the side wall of the filter cylinder 6 via a gooseneck tube 7. A fumigation pipe 9 connects the fumigation hood 8 and the filter cylinder 6. A rotating shaft 601 is rotatably mounted between the inner walls of the two sides of the filter cylinder 6. A first filter layer 602, a second filter layer 603, and a third filter layer 604 are sequentially arranged on the rotating shaft 601. A ratchet 605 is mounted on the rotating shaft 601, located between the first filter layer 602 and the second filter layer 603. A hollow rod 606 is fixed on the filter cylinder 6, and a first spring 607 is connected inside the hollow rod 606. One end of the spring 607 is connected to a piston rod 608. One end of the piston rod 608 passes through the bottom of the hollow rod 606 and is connected to a driven rod 609. Multiple ratchet teeth 610 are rotatably mounted on the side of the driven rod 609 near the ratchet 605. A tension spring is provided between the ratchet teeth 610 and the driven rod 609, and multiple limiting blocks corresponding to the ratchet teeth 610 are provided on the driven rod 609. An exhaust port 6 is provided on the side wall of the hollow rod 606 near the first filter layer 602. 11; A mounting plate 10 is fixed on one side of the movable base 1, and a purification box 11 is set on the top of the mounting plate 10. One end of the return pipe 12 of the purification box 11 is connected to the hollow rod 606. The end of the filter cylinder 6 away from the smoke pipe 9 is connected to the air outlet pipe 612, and one end of the air outlet pipe 612 is connected to the purification box 11. The first filter layer 602 is made of nylon mesh, the second filter layer 603 is made of activated carbon mesh, and the third filter layer 604 is made of HEPA high-efficiency filter.The lifting frame 3 can slide up and down along the guide rail 2, and the table 4 can rotate. Hydraulic cylinders can be installed on the movable base 1 and the lifting frame 3 respectively to drive the table 4 to rise and rotate. During welding, the gooseneck tube 7 is used to move the fume hood 8 to the designated position so that the fume hood 8 can accurately align with the welding point. The purification box 11 has an air suction function. The fumes generated during welding enter the filter cartridge 6 through the fume hood 8 and the fume pipe 9, and pass through the first filter layer 602, the second filter layer 603 and the third filter layer 604 in sequence. The first filter layer 602 filters the welding slag and other particles generated during welding to prevent clogging. Following the first filter layer, the second filter layer 603 adsorbs volatile organic compounds in the smoke, such as rosin acid and flux volatiles, removing irritating odors. The third filter layer 604 filters fine particles, such as heavy metal dust like lead and tin. The purification chamber 11 performs final purification, ensuring that the emitted gas will not pollute the environment or harm the health of workers. A portion of the purified gas enters the hollow rod 606 through the return pipe 12. The air pressure inside the hollow rod 606 gradually increases, pushing the piston rod 608 down and stretching the first spring 607. The piston rod 608 and the driven rod 609 descend together, allowing the smoke to pass through... The ratchet 610 drives the ratchet 605 and the shaft 601 to rotate, allowing the smoke to evenly contact different areas of each filter layer, ensuring full utilization of the filter layers. When the piston rod 608 is pushed by air pressure to below the exhaust port 611, the gas inside the hollow rod 606 is discharged through the exhaust port 611. The piston rod 608 automatically resets under the action of the first spring 607, and the discharged gas blows towards the first filter layer 602, periodically blowing away large particles of impurities attached to the first filter layer 602, maintaining the air permeability of the first filter layer 602. It is worth noting that the size of the exhaust port 611 can be adjusted. Adjustments can be made according to actual conditions to achieve a backflushing effect on the first filter layer 602. A slag collection box can also be added to the filter cylinder 6 to collect fallen impurity particles. Both the air outlet pipe 612 and the return pipe 12 are flexible hoses. A drain pipe 26 with a valve is connected to the bottom wall of the purification box 11. When the height or angle of the platform 4 is adjusted, the air outlet pipe 612 and the return pipe 12 can extend or change position accordingly for easy adjustment. In addition, under the action of the limiting block and the tension spring, the ratchet 610 can automatically reset, and the deflection direction of the ratchet 610 is limited. This is existing technology and will not be described in detail here.

[0020] See Figure 6 and Figure 7The exhaust pipe 612 extends into the interior of the purification chamber 11, and multiple air distribution holes are provided at the end of the exhaust pipe 612 extending into the purification chamber 11. The gas treated by the filter cartridge 6 enters the purification chamber 11 through the air distribution holes on the exhaust pipe 612, and the gas is evenly distributed inside the purification chamber 11. A liquid inlet pipe 15 is connected to the top of the purification chamber 11. One end of the liquid inlet pipe 15 is connected to an external reagent source, and the other end extends into the purification chamber 11 and is rotatably mounted with a spray disc 16. Three spray discs are connected to the top wall of the purification chamber 11. The three-way pipe 13 is located inside the purification box 11. One end of the pipe 13 is equipped with an air intake fan 21. One end of the return pipe 12 is connected to one port of the three-way pipe 13, and the third port of the three-way pipe 13 is connected to an exhaust pipe 14. The adsorbent is sent into the spray disc 16 through the liquid inlet pipe 15. Spray holes are arrayed on the bottom wall of the spray disc 16. The adsorbent is evenly sprayed out through the spray holes to finally purify the gas. The purified gas is sent to the outside under the action of the air intake fan 21.

[0021] See Figure 7 A gear ring 18 is fixed on the outer wall of the spray disc 16, and a motor 19 is installed on the top wall of the purification box 11. The output shaft of the motor 19 extends into the purification box 11 and a gear 20 is installed thereon, and the gear 20 meshes with the gear ring 18. When the motor 19 is started, the spray disc 16 can be rotated under the action of the gear 20 and the gear ring 18, thereby expanding the spray area and improving the purification effect.

[0022] See Figure 5 , Figure 7 and Figure 8 A push rod 17 is fixed to the top of the spray disc 16, and an L-shaped movable rod 22 is movably installed on the side wall of the three-way pipe 13. A push block 23 is fixed to one end of the movable rod 22, and a sealing block 24 is fixed to the other end. A second spring 25 is connected between the movable rod 22 and the inner wall of the three-way pipe 13. The cross-sections of the push rod 17 and the push block 23 are both semi-circular. In the initial state, the sealing block 24 blocks one end of the three-way pipe 13, and the gas cannot enter the return pipe 12. Every time the spray disc 16 rotates, the push rod 17 contacts the push block 23 once. The push rod 17 will push the push block 23 to move and squeeze the second spring 25. At this time, the sealing block 24 moves to block the other end, and the gas is discharged through the return pipe 12, ensuring that there is enough air pressure to push the piston rod 608 to move.

[0023] The working principle of this invention is as follows: First, adjust the height and angle of the worktable 4, then place the tools to assemble the electronic product by soldering. During soldering, the gooseneck tube 7 is used to move the fume hood 8 to the designated position so that the fume hood 8 can accurately align with the soldering point. The connection between the fume extraction tube 9 and the filter cartridge 6 is located slightly above. The suction fan 21 and motor 19 in the purification box 11 are started, and the adsorbent is sent into the liquid inlet pipe 15 using an external chemical source (not shown). The smoke generated during soldering is drawn into the filter cartridge 6 through the fume hood 8 and the fume extraction tube 9, and then passes through the first filter layer 602, the second filter layer 603, and... The third filter layer 604 filters out particles such as welding slag and debris generated during welding, preventing clogging of subsequent filter layers. The second filter layer 603 adsorbs volatile organic compounds in the fumes, such as rosin acid and flux volatiles, removing irritating odors. The third filter layer 604 filters out fine particles, such as heavy metal dust like lead and tin. The gas treated in the filter cartridge 6 enters the purification chamber 11 through the exhaust pipe 612. The spray disc 16 rotates, and the adsorption agent performs final purification of the air. Finally, the gas is discharged through the exhaust pipe 14, ensuring that the discharged gas will not pollute the environment or harm the health of the workers. like Figure 7 As shown, in the initial state, the blocking block 24 is located on the left side of the three-way pipe 13, and the gas can only be discharged through the exhaust pipe 14. Every time the spray disc 16 rotates, the push rod 17 contacts the push block 23 once. The push rod 17 will push the push block 23 to move and squeeze the second spring 25. At this time, the blocking block 24 moves to block the right side of the three-way pipe 13, and the gas can only enter the hollow rod 606 through the return pipe 12. The gas pressure in the hollow rod 606 gradually increases, pushing the piston rod 608 down and stretching the first spring 607. The piston rod 608 and the driven rod 609 fall together, passing through the ratchet. 610 can drive the ratchet 605 and the shaft 601 to rotate, causing multiple filter layers to change position. The smoke can evenly contact different areas of each filter layer, and the filter layers can be fully utilized. When the piston rod 608 is pushed by air pressure to below the exhaust port 611, the gas in the hollow rod 606 is discharged through the exhaust port 611. The piston rod 608 is automatically reset under the action of the first spring 607, and the discharged gas is blown towards the first filter layer 602. Large particulate impurities attached to the first filter layer 602 can be blown off in the opposite direction at regular intervals to maintain the air permeability of the first filter layer 602. After the pressure is released, the piston rod 608 returns to its original position under the action of the first spring 607, and the push rod 17 disengages from the push block 23. The sealing block 24 also automatically returns to its original position, and the gas is discharged normally through the exhaust pipe 14. By adjusting the speed of the motor 19 and repeating the above process, the filter layer can be rotated periodically, so that the smoke can evenly contact different areas of the filter layer. Its adsorption and filtration areas are fully utilized, avoiding the waste problem of "partial failure and overall abandonment".

[0024] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A liftable workbench for an electronic product assembly line, comprising a movable base (1), guide rails (2) symmetrically mounted on the movable base (1), a lifting frame (3) movably disposed between the two guide rails (2), and a table surface (4) rotatably mounted on the top of the lifting frame (3), characterized in that, A mounting bracket (5) is fixed on one side of the tabletop (4), a filter cartridge (6) is placed on the mounting bracket (5), a fumigation hood (8) is connected to the side wall of the filter cartridge (6) through a gooseneck tube (7), and a fumigation tube (9) is connected between the fumigation hood (8) and the filter cartridge (6). A rotating shaft (601) is rotatably mounted between the inner walls of both sides of the filter cylinder (6). A first filter layer (602), a second filter layer (603), and a third filter layer (604) are sequentially arranged on the rotating shaft (601). A ratchet (605) is mounted on the rotating shaft (601) and is located between the first filter layer (602) and the second filter layer (603). A hollow rod (606) is fixed on the filter cylinder (6). A first spring (607) is connected inside the hollow rod (606). 7) One end is connected to a piston rod (608), and one end of the piston rod (608) passes through the bottom of the hollow rod (606) and is connected to a driven rod (609). The driven rod (609) has multiple ratchet teeth (610) rotatably mounted on the side near the ratchet (605). A tension spring is provided between the ratchet teeth (610) and the driven rod (609), and multiple limiting blocks corresponding to the ratchet teeth (610) are provided on the driven rod (609). An exhaust port (611) is opened on the side wall of the hollow rod (606) near the first filter layer (602). A mounting plate (10) is fixed on one side of the movable base (1), and a purification box (11) is provided above the mounting plate (10). One end of the return pipe (12) of the purification box (11) is connected to the hollow rod (606). The end of the filter cylinder (6) away from the smoke pipe (9) is connected to the air outlet pipe (612), and one end of the air outlet pipe (612) is connected to the purification box (11).

2. The liftable worktable for an electronic product assembly line according to claim 1, characterized in that, The first filter layer (602) is made of nylon mesh, the second filter layer (603) is made of activated carbon mesh, and the third filter layer (604) is made of HEPA high-efficiency mesh.

3. The liftable worktable for an electronic product assembly line according to claim 1, characterized in that, The air outlet pipe (612) extends into the interior of the purification box (11), and a plurality of air distribution holes are provided at one end of the air outlet pipe (612) that extends into the purification box (11).

4. The liftable worktable for an electronic product assembly line according to claim 1, characterized in that, The top of the purification box (11) is connected to an inlet pipe (15). One end of the inlet pipe (15) is connected to an external drug source, and the other end extends into the purification box (11) and is rotatably mounted with a spray disc (16). A three-way pipe (13) is connected to the top wall of the purification box (11). An air suction fan (21) is installed at one end of the three-way pipe (13) inside the purification box (11). One end of the return pipe (12) is connected to one of the ports of the three-way pipe (13), and the third port of the three-way pipe (13) is connected to an exhaust pipe (14).

5. The liftable worktable for an electronic product assembly line according to claim 4, characterized in that, A gear ring (18) is fixed on the outer wall of the spray disc (16), and a motor (19) is installed on the top wall of the purification box (11). The output shaft of the motor (19) extends into the purification box (11) and a gear (20) is installed thereon, and the gear (20) meshes with the gear ring (18).

6. The liftable worktable for an electronic product assembly line according to claim 5, characterized in that, A push rod (17) is fixed to the top of the spray disc (16), and an L-shaped movable rod (22) is movably arranged on the side wall of the three-way pipe (13). A push block (23) is fixed to one end of the movable rod (22), and a sealing block (24) is fixed to the other end. A second spring (25) is connected between the movable rod (22) and the inner wall of the three-way pipe (13). The cross-sections of the push rod (17) and the push block (23) are both semi-circular.

7. The liftable worktable for an electronic product assembly line according to claim 1, characterized in that, The exhaust pipe (612) and the return pipe (12) are both flexible hoses, and the bottom wall of the purification box (11) is connected to a drain pipe (26) with a valve.

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