Alkali etching and polishing equipment for battery piece production

Abstract

The utility model belongs to the technical field of battery piece etching, and particularly relates to alkali etching polishing equipment for battery piece production, which comprises a box body, partition plates which are uniformly distributed are longitudinally fixed in the box body, and sealing plates are respectively arranged at the left ends and the right ends of an alkali washing tank and an acid washing tank in a sliding manner. When the battery piece needs to be moved into the alkali washing tank and the acid washing tank, the clamping block is clamped and fixed through the moving mechanism and the clamping mechanism and is pulled upwards, so that the sealing plate is moved upwards, the battery piece moving channel is opened, and when the battery piece is moved into the alkali washing tank and the acid washing tank for reaction, the clamping mechanism is loosened; at the moment, sealing plates at the two ends of the alkaline washing tank and the pickling tank move downwards under the tension action of connecting springs, a battery piece moving channel is blocked, gas generated by reaction can only be filtered through activated carbon in a filtering pipe and then is discharged, and air pollution to a processing site is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery piece etching technology field, concretely is a kind of base etching polishing equipment for battery piece production. BACKGROUND

[0002] Etching, it is semiconductor manufacturing process, microelectronic IC manufacturing process and micro-nano manufacturing process one quite important step, etching is to remove the process of unwanted material from the surface of silicon wafer by chemical or physical method, its basic goal is to correctly copy mask pattern on the silicon wafer with glue, with the development of microfabrication process, broadly speaking, etching becomes a general term for stripping, removing material by solution, reaction ion or other mechanical means, becomes a universal name of microfabrication.

[0003] The existing etching polishing equipment still has the following technical problems when in use:

[0004] The channel for moving battery piece in the existing etching polishing equipment is always through, and the side wall of acid and alkali storage tank does not have sealing measures, so that harmful gas generated in the process of contact between acid, alkali and battery piece can be directly discharged through the channel without filtering by activated carbon, causing air pollution in processing area.

[0005] Therefore, the base etching polishing equipment for battery piece production is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a kind of base etching polishing equipment for battery piece production to solve the problems raised in the above background technology.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of base etching polishing equipment for battery piece production, including box, the inside of the box is fixed with the partition plate of uniform arrangement, the cavity in the box is sequentially separated into film spraying groove, etching groove, first cleaning tank, alkali cleaning tank, second cleaning tank, pickling tank, third cleaning tank, air drying chamber by partition plate from right to left;

[0008] The lower end in the film spraying groove, etching groove, first cleaning tank, alkali cleaning tank, second cleaning tank, pickling tank, third cleaning tank, air drying chamber is fixed with lifting mechanism, and the upper end of the lifting mechanism is fixed with battery piece transmission mechanism;

[0009] The upper side wall of the film spraying groove, first cleaning tank, second cleaning tank and third cleaning tank is fixed with mounting pipe, the lower end of the mounting pipe is fixed with spray head, the upper side wall of the air drying chamber is fixed with air inlet pipe, and the inside of the air inlet pipe is fixed with blowing fan;

[0010] The left and right sides of the box and the side walls of the evenly arranged partition plates are provided with battery piece moving channels, the battery piece moving channels in the side walls of the partition plates on the left and right sides of the alkali washing tank and the partition plates on the left and right sides of the acid washing tank are slidably provided with sealing plates, the upper ends of the sealing plates extend through the upper side of the box to the upper end and are fixedly provided with fixed plates, the upper side of the fixed plate is fixedly provided with a clamping block, the front side and the rear side of the clamping block are provided with limiting grooves, the left end and the right end of the lower side of the fixed plate are fixedly provided with connecting springs, the lower ends of the two connecting springs are fixedly connected with the upper side of the box, the upper sides of the box at the upper ends of the alkali washing tank and the acid washing tank are fixedly provided with exhaust fans, the upper ends of the exhaust fans are fixedly provided with filter pipes, and the filter pipes are fixedly provided with activated carbon inside.

[0011] The upper side of the box is fixedly provided with symmetrical support rods, the upper ends of the symmetrical support rods are commonly provided with a moving mechanism, the lower end of the moving mechanism is fixedly provided with a clamping mechanism, the lower ends of the front sides of the alkali washing tank and the acid washing tank are fixedly provided with discharge pipes, and the upper ends of the front sides of the alkali washing tank and the acid washing tank are fixedly provided with addition pipes.

[0012] Preferably, the lifting mechanism comprises a gas cylinder, the gas cylinder is fixedly connected with the lower end of the inside of the film spraying tank, the etching tank, the first cleaning tank, the alkali washing tank, the second cleaning tank, the acid washing tank, the third cleaning tank and the air drying chamber respectively, the upper end of the gas cylinder is fixedly provided with a support plate, the front end and the rear end of the upper side of the support plate are fixedly provided with symmetrical fixed rods, and the ends close to each other of the symmetrical fixed rods are fixedly connected with the transmission mechanism.

[0013] Preferably, the transmission mechanism comprises a machine box, the front side and the rear side of the machine box are fixedly connected with the fixed rods, the left end and the right end of the inside of the machine box are fixedly provided with double-shaft motors, the two ends of the two double-shaft motors are fixedly provided with transmission rods, the two transmission rods extend through the side walls of the machine box to the outside and are fixedly provided with transmission wheels, the two transmission rods are rotatably connected with the side walls of the machine box, the front side and the rear side of the machine box are rotatably provided with limiting rods, the ends of the two limiting rods extending to the outside of the machine box are fixedly provided with follow-up wheels, and the outside of the transmission wheels and the follow-up wheels is commonly provided with a conveyor belt.

[0014] Preferably, the moving mechanism comprises a strip-shaped plate, the lower side of the strip-shaped plate is fixedly connected with the upper ends of the two support rods, the lower side wall of the strip-shaped plate is provided with a sliding groove, a screw rod is rotatably arranged in the inside of the sliding groove, the right side of the strip-shaped plate is fixedly provided with a motor, the right end of the screw rod is fixedly connected with the output end of the motor, the rod wall of the screw rod is threadedly provided with a moving block, and the upper side of the moving block is slidably connected with the inner wall of the sliding groove.

[0015] Preferably, the clamping mechanism comprises a first electric push rod, the lower end of the first electric push rod is fixedly connected with the lower side wall of the moving block, the front side and the rear side of a U-shaped plate fixedly connected with the lower end of the first electric push rod are fixedly connected with a second electric push rod, and the one end of the second electric push rod extending to the inside of the U-shaped plate is fixedly connected with a limiting block.

[0016] Preferably, the side wall of the sealing plate is fixedly connected with a rubber sealing gasket.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The sealing plate is slidably arranged at the left end and the right end of the alkali washing tank and the acid washing tank, the clamping mechanism is used for clamping and fixing the clamping block and pulling up when the battery piece needs to be moved into the alkali washing tank and the acid washing tank, the sealing plate is moved up, and the battery piece moving channel is opened, the clamping mechanism is released when the battery piece is moved into the alkali washing tank and the acid washing tank to react, the sealing plate at the left end and the right end of the alkali washing tank and the acid washing tank is moved down under the pulling force of the connecting spring, the battery piece moving channel is blocked, and the gas generated in the reaction can only be discharged after being filtered by the activated carbon in the filter pipe, so that air pollution of the processing place is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure schematic view of the utility model;

[0020] Figure 2 It is a sectional structure schematic view of the box body;

[0021] Figure 3 It is a structure schematic view of the lifting mechanism;

[0022] Figure 4 It is a top sectional view of the case;

[0023] Figure 5 It is a sectional structure schematic view of the air inlet pipe;

[0024] Figure 6 It is a sectional view of the exhaust fan and the filter pipe;

[0025] Figure 7 It is a structure schematic view of the moving mechanism;

[0026] Figure 8 It is a structure schematic view of the clamping mechanism.

[0027] In the figure: 1 box, 2 partition plate, 3 spray film tank, 4 etching tank, 5 first cleaning tank, 6 caustic washing tank, 7 second cleaning tank, 8 pickling tank, 9 third cleaning tank, 10 air drying chamber, 11 installation pipe, 12 spray head, 13 air inlet pipe, 14 blowing fan, 15 sealing plate, 16 fixed plate, 17 clamping block, 18 connecting spring, 19 exhaust fan, 20 filter pipe, 21 activated carbon, 22 support rod, 23 support plate, 24 fixed rod, 25 machine box, 26 double-shaft motor, 27 transmission rod, 28 transmission wheel, 29 limiting rod, 30 follower wheel, 31 conveying belt, 32 strip plate, 33 screw rod, 34 motor, 35 moving block, 36 first electric push rod, 37 U-shaped plate, 38 second electric push rod, 39 limiting block, 40 air cylinder. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] Embodiment:

[0031] Please refer to Figures 1-8 The present application provides a technical solution:

[0032] The application discloses a kind of alkali etching polishing equipment for battery piece production, including box 1, the inside of box 1 is fixed with the partition plate 2 of uniform arrangement, the cavity in the inside of box 1 is separated by partition plate 2 in turn into film spraying groove 3, etching groove 4, first cleaning tank 5, alkali cleaning tank 6, second cleaning tank 7, pickling tank 8, third cleaning tank 9, air drying chamber 10, film spraying groove 3 is to be plated with a layer of water film on the surface of battery piece, so that etching is more uniform;Etching groove 4 is filled with etching liquid inside, and battery piece is etched by contacting with battery piece;First cleaning tank 5, second cleaning tank 7 and third cleaning tank 9 are all sprayed by water nozzle 12, so as to flush battery piece, the mounting pipe 11 on the upper end of water nozzle 12 is connected with external water supply equipment, which is not shown here;Alkali cleaning tank 6 is filled with lye and polishing liquid inside, to realize the polishing of battery piece, pickling tank 8 is filled with acid liquid inside, to pickling battery piece, air drying chamber 10 can quickly dry the water on the surface of battery piece after flushing battery piece;

[0033] The lower end of the inside of film spraying groove 3, etching groove 4, first cleaning tank 5, alkali cleaning tank 6, second cleaning tank 7, pickling tank 8, third cleaning tank 9 and air drying chamber 10 is fixed with lifting mechanism, and the upper end of lifting mechanism is fixed with battery piece transmission mechanism;

[0034] The upper side wall of film spraying groove 3, first cleaning tank 5, second cleaning tank 7 and third cleaning tank 9 is fixed with mounting pipe 11, and the lower end of mounting pipe 11 is fixed with water nozzle 12, the upper side wall of air drying chamber 10 is fixed with air inlet pipe 13, air inlet pipe 13 is fixed with air blowing fan 14 inside, and the mounting pipe 11 on the upper end of film spraying groove 3 needs to be connected with the equipment for providing film spraying liquid, which is not shown here;

[0035] The left and right sides of the box body 1 and the side walls of the evenly arranged partition plates 2 are provided with battery piece moving channels, the battery piece moving channels in the left and right sides of the partition plates 2 of the alkali washing tank 6 and the left and right sides of the partition plates 2 of the side walls of the acid washing tank 8 are slidably provided with sealing plates 15, the upper ends of the sealing plates 15 extend to the upper end of the box body 1 and are fixed with fixed plates 16, the upper side of the fixed plate 16 is fixed with a clamping block 17, the front side and the rear side of the clamping block 17 are provided with limiting grooves, the left end and the right end of the lower side of the fixed plate 16 are fixed with connecting springs 18, after the clamping force of the clamping mechanism on the clamping block 17 is released, the sealing plate 15 will reset under the tension of the connecting spring 18, the lower ends of the two connecting springs 18 are fixedly connected with the upper side of the box body 1, the upper side of the box body 1 is fixed with an exhaust fan 19 at the upper end of the alkali washing tank 6 and the acid washing tank 8, the upper end of the exhaust fan 19 is fixed with a filter pipe 20, the inside of the filter pipe 20 is fixed with activated carbon 21, harmful gases will be generated during the contact of the alkali and the acid with the battery piece, at this time, the harmful gases are sucked into the inside of the filter pipe 20 by the exhaust fan 19, and are absorbed by the activated carbon 21, so as to avoid the direct emission of the harmful gases through the battery piece moving channel, thereby avoiding air pollution;

[0036] The upper side of the box body 1 is fixed with symmetrical support rods 22, the upper ends of the symmetrical support rods 22 are jointly provided with a moving mechanism, the lower end of the moving mechanism is fixed with a clamping mechanism, the lower end of the front side of the alkali washing tank 6 and the acid washing tank 8 is fixed with a discharge pipe, the upper end of the front side of the alkali washing tank 6 and the acid washing tank 8 is fixed with an adding pipe, the discharge pipe and the adding pipe can be replaced accordingly when the acid and the alkali are used for a long time.

[0037] The lifting mechanism comprises a gas cylinder 40, the gas cylinder 40 is fixedly connected with the lower end of the inside of the membrane spraying tank 3, the etching tank 4, the first cleaning tank 5, the alkali washing tank 6, the second cleaning tank 7, the acid washing tank 8, the third cleaning tank 9 and the air drying chamber 10 respectively, the upper end of the gas cylinder 40 is fixed with a support plate 23, the front end and the rear end of the upper side of the support plate 23 are fixed with symmetrical fixed rods 24, the ends close to each other of the symmetrical fixed rods 24 are fixedly connected with a transmission mechanism.

[0038] The transmission mechanism comprises a box 25, the front side and the rear side of the box 25 are fixedly connected with the fixed rods 24, the left end and the right end in the box 25 are fixedly connected with double-shaft motors 26, the two ends of the two double-shaft motors 26 are fixedly connected with transmission rods 27, the two transmission rods 27 extend to the outside through the side walls of the box 25 and are fixedly connected with transmission wheels 28, the two transmission rods 27 are rotationally connected with the side walls of the box 25, the front side and the rear side of the box 25 are rotationally connected with limiting rods 29, the one ends of the two limiting rods 29 extending to the outside of the box 25 are fixedly connected with follower wheels 30, the outside of the transmission wheels 28 and the follower wheels 30 are jointly provided with a conveying belt 31, the two transmission rods 27 are driven to rotate by the work of the two double-shaft motors 26, the two transmission wheels 28 are driven to rotate by the two transmission rods 27, and the conveying belt 31 is driven to move by the two transmission wheels 28, so that the battery piece is conveyed.

[0039] The moving mechanism comprises a strip-shaped plate 32, the lower side of the strip-shaped plate 32 is fixedly connected with the upper ends of the two supporting rods 22, the lower side wall of the strip-shaped plate 32 is provided with a sliding groove, the sliding groove is rotationally provided with a lead screw 33, the right side of the strip-shaped plate 32 is fixedly connected with a motor 34, the right end of the lead screw 33 is fixedly connected with the output end of the motor 34, the rod wall of the lead screw 33 is threadedly provided with a moving block 35, the upper side of the moving block 35 is slidably connected with the inner wall of the sliding groove, the motor 34 is a reversible motor, the lead screw 33 at the output end is driven to rotate by the motor 34, the moving block 35 threadedly connected with the rod wall of the lead screw 33 is driven to move, and the clamping mechanism at the lower end is driven to move by the moving block 35.

[0040] The clamping mechanism comprises a first electric push rod 36, the first electric push rod 36 is fixedly connected with the lower side wall of the moving block 35, the lower end of the first electric push rod 36 is fixedly connected with a U-shaped plate 37, the front side and the rear side of the U-shaped plate 37 are fixedly connected with second electric push rods 38, the one ends of the two second electric push rods 38 extending to the inside of the U-shaped plate 37 are fixedly connected with limiting blocks 39, and the limiting blocks 39 are clamped with the limiting grooves.

[0041] The side wall of the sealing plate 15 is fixedly connected with a rubber sealing gasket, so as to ensure the sealing property of the sealing plate 15 and the battery piece moving channel.

[0042] Working principle:

[0043] When working, the lifting mechanism inside the film spraying groove 3 is started, the lifting mechanism drives the transmission mechanism to move to be flush with the battery piece moving channel, the battery piece is moved from the battery piece moving channel on the right side of the box body 1 to the inside of the film spraying groove 3, the battery piece is plated with a water film through the installation pipe 11 on the upper side wall and the spray head 12, which can make the etching of the battery piece more uniform, after plating, the lifting mechanism inside the etching groove 4, the transmission mechanism and the lifting mechanism and the transmission mechanism inside the film spraying groove 3 are matched, so that the battery piece is moved to the inside of the etching groove 4 for etching, after etching is completed, the battery piece is moved to the first cleaning tank 5 for flushing through the same method, before moving to the alkali washing tank 6, the sealing plate 15 on the upper end of the clamping block 17 on the right side of the alkali washing tank 6 is pulled through the cooperation of the lifting mechanism and the clamping mechanism, so that the battery piece moving channel on the right side of the alkali washing tank 6 is opened, the battery piece is moved to the inside of the alkali washing tank 6 in the same way, and is polished by reaction of alkali and polishing liquid, after polishing is completed, the sealing plate 15 inside the battery piece moving channel on the left side of the alkali washing tank 6 is opened in the same way as above, and then the battery piece is moved to the inside of the second cleaning tank 7 for cleaning, and continues to enter the acid washing tank 8, the third cleaning tank 9 and the final air drying chamber 10 in the same way, in the process of alkali washing and acid washing, a large amount of harmful gas is generated, at this time, the exhaust fan 19 is started, the exhaust fan 19 draws the harmful gas into the inside of the filter pipe 20, and filters through the activated carbon 21, so that air pollution of the processing place caused by direct discharge is effectively avoided.

[0044] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, for those skilled in the art, obviously, the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model, any figure mark in the claims should not be regarded as limiting the claims involved.

[0045] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principle and spirit of the utility model, the scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. An alkali etching and polishing device for battery sheet production, comprising a box body (1), characterized in that, The inside of the box (1) is longitudinally fixed with uniformly arranged partition plates (2), and the cavity inside the box (1) is sequentially divided into a film spraying groove (3), an etching groove (4), a first cleaning groove (5), an alkali cleaning groove (6), a second cleaning groove (7), an acid cleaning groove (8), a third cleaning groove (9) and a drying chamber (10) by the partition plates (2) from right to left. The lower end of the inside of the film spraying groove (3), the etching groove (4), the first cleaning groove (5), the alkali cleaning groove (6), the second cleaning groove (7), the acid cleaning groove (8), the third cleaning groove (9) and the drying chamber (10) is fixed with a lifting mechanism, and the upper end of the lifting mechanism is fixed with a battery piece transmission mechanism. The upper side wall of the film spraying groove (3), the first cleaning groove (5), the second cleaning groove (7) and the third cleaning groove (9) is fixed with a mounting pipe (11), the lower end of the mounting pipe (11) is fixed with a spray head (12), the upper side wall of the drying chamber (10) is fixed with an air inlet pipe (13), and the inside of the air inlet pipe (13) is fixed with a blowing fan (14). The left side and the right side of the box (1) and the side wall of the uniformly arranged partition plates (2) are all provided with a battery piece moving channel, the battery piece moving channel inside the side wall of the partition plates (2) on the left side and the right side of the alkali cleaning groove (6) and the partition plates (2) on the left side and the right side of the acid cleaning groove (8) is slidably provided with a sealing plate (15), the upper end of the sealing plate (15) extends to the upper end and is fixed with a fixed plate (16) through the upper side of the box (1), the upper side of the fixed plate (16) is fixed with a clamping block (17), the front side and the rear side of the clamping block (17) are both provided with a limiting groove, the left end and the right end of the lower side of the fixed plate (16) are both fixed with a connecting spring (18), the lower end of the two connecting springs (18) is fixedly connected with the upper side of the box (1), the upper side of the box (1) is fixed with an exhaust fan (19) at the upper end of the alkali cleaning groove (6) and the acid cleaning groove (8), the upper end of the exhaust fan (19) is fixed with a filter pipe (20), and the inside of the filter pipe (20) is fixed with activated carbon (21). The upper side of the box (1) is fixed with symmetrical support rods (22), the upper ends of the symmetrical support rods (22) are commonly provided with a moving mechanism, the lower end of the moving mechanism is fixed with a clamping mechanism, the lower end of the front side of the alkali cleaning groove (6) and the acid cleaning groove (8) is fixed with a discharge pipe, and the upper end of the front side of the alkali cleaning groove (6) and the acid cleaning groove (8) is fixed with an adding pipe.

2. The alkali etching and polishing device for battery piece production according to claim 1, characterized in that: The lifting mechanism comprises a gas cylinder (40), the gas cylinder (40) is fixedly connected with the lower end of the inside of the film spraying groove (3), the etching groove (4), the first cleaning groove (5), the alkali cleaning groove (6), the second cleaning groove (7), the acid cleaning groove (8), the third cleaning groove (9) and the drying chamber (10), respectively, the upper end of the gas cylinder (40) is fixed with a support plate (23), the front end and the rear end of the upper side of the support plate (23) are both fixed with symmetrical fixed rods (24), and the end of the symmetrical fixed rods (24) close to each other is fixedly connected with the transmission mechanism.

3. The alkali etching and polishing apparatus for battery production according to claim 2, characterized in that: The transmission mechanism comprises a machine box (25), the front side and the rear side of the machine box (25) are fixedly connected with the fixed rods (24), the left end and the right end inside the machine box (25) are fixedly connected with double-shaft motors (26), the two ends of the two double-shaft motors (26) are fixedly connected with transmission rods (27), the two transmission rods (27) extend to the outside through the side wall of the machine box (25) and are fixedly connected with transmission wheels (28), the two transmission rods (27) are rotatably connected with the side wall of the machine box (25), the front side and the rear side of the machine box (25) are rotatably connected with limiting rods (29), the ends of the two limiting rods (29) extending to the outside of the machine box (25) are fixedly connected with follower wheels (30), and the outside of the transmission wheels (28) and the follower wheels (30) is jointly provided with a conveying belt (31).

4. The alkali etching and polishing apparatus for battery production according to claim 1, characterized in that: The moving mechanism comprises a strip-shaped plate (32), the lower side of the strip-shaped plate (32) is fixedly connected with the upper ends of the two support rods (22), the lower side wall of the strip-shaped plate (32) is provided with a sliding groove, the sliding groove is rotatably provided with a lead screw (33), the right side of the strip-shaped plate (32) is fixedly connected with a motor (34), the right end of the lead screw (33) is fixedly connected with the output end of the motor (34), the rod wall of the lead screw (33) is threadedly provided with a moving block (35), and the upper side of the moving block (35) is slidably connected with the inner wall of the sliding groove.

5. The alkali etching and polishing apparatus for battery production according to claim 4, characterized in that: The clamping mechanism comprises a first electric push rod (36), the first electric push rod (36) is fixedly connected with the lower side wall of the moving block (35), the lower end of the first electric push rod (36) is fixedly connected with a U-shaped plate (37), the front side and the rear side of the U-shaped plate (37) are fixedly connected with second electric push rods (38), the ends of the two second electric push rods (38) extending to the inside of the U-shaped plate (37) are fixedly connected with limiting blocks (39), and the limiting blocks (39) are clamped with the limiting grooves.

6. The alkali etching and polishing apparatus for battery production according to claim 1, characterized in that: The side wall of the sealing plate (15) is fixedly connected with a rubber sealing gasket.

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