CN223703701U - Water quality monitoring storage device - Google Patents

Abstract

The utility model relates to a water quality monitoring and storing device. Including container, shutoff piece, montant, stay cord, gravity piece and support, the lower end wall of container is equipped with the opening, the upper end wall of container is equipped with the round hole, the shutoff piece is located the container and shutoff opening, the shutoff piece can float in water, the montant sets firmly on the shutoff piece, the upper portion sliding fit of montant is in the round hole, be equipped with the pore in the montant, pore upper end intercommunication montant surface and be located the round hole, pore lower extreme intercommunication montant lower extreme surface, the gravity piece hangs on the shutoff piece through the stay cord, the support set firmly in on the container, the support lower extreme is located the gravity piece downside. In the process of using the water quality monitoring and storing device, the container is moved downwards to open the opening by means of buoyancy of water, and when the water sample in the container reaches a certain amount, the opening is automatically closed, and the opening is conveniently opened and closed.

Description

Water quality monitoring storage device

Technical Field

The utility model relates to the technical field of water quality monitoring, in particular to a water quality monitoring storage device.

Background

Existing water quality monitoring includes multiple steps of point selection, collection, transportation, analysis and the like, water samples of various water qualities, and the time from collection to analysis can change to different degrees due to physical, chemical and biological effects, so that the samples in analysis are no longer samples in sampling, and in order to minimize the changes, the water quality monitoring storage device is required to protect the samples in the transportation process.

The existing water sample storage mode is that an operator loads the water sample collected by the sampling point into a sampling bottle, and the water sample is stored through the sampling bottle. The existing opening on the sampling bottle is generally sealed by adopting a screw cap, when a water sample is required to be filled into the sampling bottle, the screw cap is required to be screwed off from the sampling bottle to open the opening on the sampling bottle, after the water sample is filled into the sampling bottle, the screw cap is screwed on the sampling bottle to seal the opening on the sampling bottle, and both the opening on the sampling bottle and the opening on the sampling bottle are troublesome when the opening on the sampling bottle is opened.

Disclosure of utility model

Accordingly, the present utility model is directed to a water quality monitoring and storing device, which solves the technical problem that the opening of the sampling bottle is troublesome when the opening of the sampling bottle is opened and the opening of the sampling bottle is closed.

The utility model is realized by the following technical scheme:

The utility model provides a water quality monitoring storage device, includes container, shutoff piece, montant, stay cord, gravity piece and support, the lower end wall of container is equipped with the opening, the upper end wall of container is equipped with the round hole, the shutoff piece is located the container and shutoff opening, the shutoff piece can float in water, the montant sets firmly on the shutoff piece, the upper portion sliding fit of montant is in the round hole, be equipped with the pore in the montant, pore upper end intercommunication montant surface and be located the round hole, pore lower extreme intercommunication montant lower extreme surface, the gravity piece hangs on the shutoff piece through the stay cord, the support set firmly in on the container, the support lower extreme is located the gravity piece downside.

Further, the sealing ring is fixedly arranged on the hole wall of the round hole.

Further, the portable device further comprises a portable rod and a connecting part, wherein the portable rod is positioned above the container and horizontally arranged, and the connecting part is connected with the portable rod and the container.

The connecting part comprises two sliding rods and a counterweight ring, wherein the two sliding rods are respectively positioned at two opposite sides of the container, the sliding rods can be connected with the container in a vertical sliding mode, the counterweight ring is fixedly connected with the lower ends of the two sliding rods, the two ends of the portable rod are fixedly connected with the upper ends of the two sliding rods in a one-to-one correspondence mode, and the pull ropes are positioned in ring holes of the counterweight ring.

The connecting part further comprises two fixing blocks, the two fixing blocks are fixedly arranged on the container and are respectively positioned at two opposite sides of the container, through holes are formed in the two fixing blocks, the through holes are vertically arranged, and the two sliding rods are correspondingly and slidably matched in the two through holes one by one.

Further, the container is characterized in that a chute is formed by downwards sinking the upper end face of the container, the chute is perpendicular to the length direction of the portable rod, one end of the chute is located right below the portable rod, the container further comprises a sliding block and a supporting rod, the sliding block is in sliding fit in the chute, the lower end of the supporting rod is fixedly connected with the sliding block, and the upper end of the supporting rod is used for supporting the portable rod.

Further, the sliding block is further provided with a spring, one end of the spring is connected with the side wall of the sliding groove, and the other end of the spring is connected with the sliding block.

Further, the support includes two telescopic links, two the telescopic link is the structure that can follow its axial extension, two the upper end fixed connection of telescopic link the outer wall of container.

Further, the telescopic link includes body, interior pole and bolt, the upper end fixed connection of interior pole the outer wall of container, interior pole lower extreme is located in the body, interior pole cooperatees with the inner chamber of body, be provided with the screw on the lateral wall of body, the screw in end spiro union of bolt is in the screw and support and hold interior pole.

Further, the shutoff piece includes buoyancy piece, plate body and rubber pad, buoyancy piece rigid coupling in the lower extreme of slide bar, plate body upper end fixed connection the buoyancy piece, the bonding of plate body lower extreme has the rubber pad, the buoyancy piece can drive plate body and rubber pad float in water.

The utility model has the beneficial effects that:

in the process of using the water quality monitoring and storing device, when the container is placed in water, the plugging block can float on the water surface, and can be separated from the lower end wall of the container only by moving the container downwards, namely, the opening can be opened by means of the buoyancy of the water; when the water sample in the container reaches a certain amount, an operator releases the gravity block, the opening can be automatically closed, the inner cavity of the container can be in a closed state, and the opening on the water quality monitoring storage device are convenient to open.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is an enlarged view of a portion of the utility model at A in FIG. 1;

FIG. 3 is a schematic view of the present utility model in cross-section;

FIG. 4 is an enlarged view of a portion of the utility model at B in FIG. 3;

fig. 5 is a partial enlarged view of fig. 3C in accordance with the present utility model.

1, A container, 11, a portable rod, 111, a fixed block, 112, a counterweight ring, 113, a sliding rod, 12, a supporting rod, 121, a sliding block, 122, a spring, 2, a plugging block, 21, a rubber pad, 22, a plate body, 23, a buoyancy block, 3, a vertical rod, 31, a pore canal, 32, a sealing ring, 4, a pull rope, 5, a gravity block, 6, a bracket, 61, an inner rod, 62, a pipe body, 63 and a bolt.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the foregoing description of the utility model, it should be noted that the azimuth or positional relationship indicated by the terms "one side", "another side", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the utility model and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "identical" and the like do not denote that the components are identical, but rather that there may be minor differences. The term "perpendicular" merely means that the positional relationship between the components is more perpendicular than "parallel" and does not mean that the structure must be perfectly perpendicular, but may be slightly tilted.

Referring to fig. 1-5, the utility model provides a technical scheme that the water quality monitoring storage device comprises a container 1, a plugging block 2, a vertical rod 3, a pull rope 4, a gravity block 5 and a bracket 6, wherein an opening is formed in the lower end wall of the container 1, a round hole is formed in the upper end wall of the container 1, the plugging block 2 is positioned in the container 1 and plugs the opening, the plugging block 2 can float in water, the vertical rod 3 is fixedly arranged on the plugging block 2, the upper part of the vertical rod 3 is in sliding fit in the round hole, a duct 31 is formed in the vertical rod 3, the upper end of the duct 31 is communicated with the outer surface of the vertical rod 3 and is positioned in the round hole, the lower end of the duct 31 is communicated with the outer surface of the lower end of the vertical rod 3, the gravity block 5 is suspended on the plugging block 2 through the pull rope 4, the bracket 6 is fixedly arranged on the container 1, and the lower end of the bracket 6 is positioned at the lower side of the gravity block 5.

In the initial state of the water quality monitoring and storing device, the bracket 6 is supported on the operating platform, and the plugging block 2 is supported on the lower end wall of the container 1 and plugs the opening. The gravity block 5 is suspended on the lower side of the plugging block 2 through the pull rope 4, the gravity block 5 provides downward pulling force for the plugging block 2, so that the plugging block 2 is tightly pressed on the lower end wall of the container 1, the upper end of the pore channel 31 is positioned in the round hole, and the upper end of the pore channel 31 is plugged by the wall of the round hole.

When a water sample is required to be filled into the water quality monitoring and storing device, the water quality monitoring and storing device is carried to a water area to be sampled, an operator holds the gravity block 5 by one hand and holds the upper end of the container 1 by the other hand, so that the pull rope 4 is in a loose state. Then the container 1 is put into water and gradually moved down, because the plugging block 2 can float in the water, that is, the overall average density of the plugging block 2 is smaller than that of the water, when the container 1 is put into the water, the plugging block 2 can float on the water surface, and during the process of moving down the container 1, the lower end wall of the container 1 can be separated from the plugging block 2, and water samples enter the container 1 from the opening. When the water sample in the container 1 reaches a certain amount, an operator loosens the gravity block 5, the gravity block 5 sinks downwards under the action of gravity, the gravity block 5 sinks and tightens the pull rope 4, the gravity block 5 drives the blocking block 2 to move downwards, the blocking block 2 drives the vertical rod 3 to slide downwards in the round hole until the blocking block 2 blocks and blocks the opening again, at the moment, the inner cavity of the container 1 can be in a closed state, and then the water quality monitoring storage device can be removed from the water.

When the container 1 is put into water, the plugging block 2 can float on the water surface, the plugging block 2 can be separated from the lower end wall of the container 1 only by moving the container 1 downwards, namely, the opening can be opened by means of the buoyancy of the water, when the water sample in the container 1 reaches a certain amount, an operator can automatically close the opening by loosening the gravity block 5, the inner cavity of the container 1 can be in a closed state, and the opening on the water quality monitoring storage device are convenient to open.

In the process of moving the container 1 downwards, the container 1 will further move downwards relative to the vertical rod 3, after the container 1 moves downwards a small distance relative to the vertical rod 3, the upper surface of the container 1 is located at the lower side of the upper edge of the upper end of the duct 31, at this time, air in the container 1 can be discharged to the outside through the duct 31, and in the process of entering the container 1 from the opening, too large negative pressure can be prevented from being formed in the container 1, so that the water sample can enter the container 1 from the opening more smoothly. When the plugging block 2 moves down and plugs the opening again, the upper end of the pore channel 31 can reenter the round hole, and the upper end of the pore channel 31 is plugged again by the side wall of the round hole.

When the water sample in the container 1 needs to be discharged, the vertical rod 3 is pulled upwards, the vertical rod 3 drives the buoyancy block 23 to move upwards and separate from the lower end wall of the container 1, and at the moment, the water in the container 1 can be discharged from the opening. When the vertical rod 3 is pulled upwards, the upper edge of the upper end of the duct 31 moves to the upper side of the round hole, so that the external air can enter the inner cavity of the container 1 from the duct 31, and the water in the container 1 can be smoothly discharged.

In the embodiment, the water quality monitoring and storing device further comprises a sealing ring 32, and the sealing ring 32 is fixedly arranged on the hole wall of the round hole.

The seal ring 32 can seal the gap between the vertical rod 3 and the round hole, so that the possibility that rainwater enters the container 1 can be further reduced.

In this embodiment, the water quality monitoring and storing device further comprises a handle 11 and a connecting portion, wherein the handle 11 is positioned above the container 1 and horizontally arranged, and the connecting portion is connected with the handle 11 and the container 1.

When an operator transfers the water quality monitoring storage device, the operator can hold the hand-held rod 11 to lift upwards, the hand-held rod 11 drives the connecting part to move upwards, and the connecting part drives the container 1 to move upwards along with the hand-held rod 11, so that the water quality monitoring storage device can be lifted and carried.

In this embodiment, the connecting portion includes two sliding rods 113 and a counterweight ring 112, the two sliding rods 113 are respectively located at two opposite sides of the container 1, the sliding rods 113 can be connected with the container 1 in a vertically sliding manner, the counterweight ring 112 is fixedly connected with the lower ends of the two sliding rods 113, two ends of the portable rod 11 are fixedly connected with the upper ends of the two sliding rods 113 in a one-to-one correspondence manner, and the pull rope 4 is located in a ring hole of the counterweight ring 112.

When the water quality monitoring storage device is required to be carried, an operator holds the hand lever 11 to lift upwards, the hand lever 11 drives the sliding rod 113 to slide upwards, the sliding rod 113 drives the counterweight ring 112 to move upwards until the counterweight ring 112 abuts against the lower end face of the container 1, and at the moment, the water quality monitoring storage device can be lifted for carrying.

When the water quality monitoring and storing device is placed on an operation table, the bracket 6 is supported on the operation table, the hand-held rod 11 is loosened, and the hand-held rod 11, the sliding rod 113 and the counterweight ring 112 move downwards under the action of gravity until the counterweight ring 112 abuts against the upper end face of the gravity block 5. At this time, the weight of the carrying bar 11, the sliding bar 113, the counterweight ring 112 and the weight block 5 acts on the pull rope 4, so that the pull rope 4 can further pull the blocking block 2 downward, the blocking block 2 can be pressed against the lower end wall of the container 1 more tightly, and the possibility that water in the container 1 leaks out from the opening can be reduced.

In this embodiment, the connecting portion further includes two fixing blocks 111, the two fixing blocks 111 are both fixedly disposed on the container 1, the fixing blocks 111 are respectively disposed on two opposite sides of the container 1, through holes are formed in the two fixing blocks 111, the through holes are vertically disposed, and the two sliding rods 113 are correspondingly slidably fitted in the two through holes one by one.

When the handle 11 is lifted, the handle 11 drives the sliding rod 113 to slide upwards in the through hole, and when the handle 11 is released, the handle 11 drives the sliding rod 113 to slide downwards in the through hole under the action of gravity, so that the sliding rod 113 can be connected with the container 1 in an up-down sliding mode.

In this embodiment, the upper end surface of the container 1 is recessed downward to form a chute, the chute is perpendicular to the length direction of the carrying pole 11, one end of the chute is located under the carrying pole 11, the water quality monitoring storage device further comprises a sliding block 121 and a supporting pole 12, the sliding block 121 is slidably matched in the chute, the lower end of the supporting pole 12 is fixedly connected with the sliding block 121, and the upper end of the supporting pole 12 is used for supporting the carrying pole 11.

Before loading a water sample into the water quality monitoring and storing device, an operator lifts the hand-held rod 11 upwards and pushes the support rod 12 to the position right below the hand-held rod 11. When the container 1 needs to be moved downwards in water, the portable rod 11 is only required to be held and pressed downwards, and the portable rod 11 can be moved downwards and prop against the upper end of the supporting rod 12, so that the container 1 can be moved downwards in water, and the container 1 can be moved downwards in water conveniently.

After the water quality monitoring and storing device is placed on an operation table, namely, after the bracket 6 is supported on the operation table, an operator pushes the supporting rod 12 to separate the upper end of the supporting rod 12 from the hand-held rod 11, at this time, the hand-held rod 11, the sliding rod 113 and the counterweight ring 112 can move downwards under the action of gravity, the counterweight ring 112 can be supported on the gravity block 5, and one side surface of the supporting rod 12 abuts against the hand-held rod 11.

In the embodiment, the size of the notch of the chute is smaller than that of the cavity of the chute, and specifically, the cross section of the chute is in a dovetail shape with a small upper part and a large lower part. With this structure, the slider 121 is not pulled out upward from the slide groove.

In this embodiment, the water quality monitoring and storing device further comprises a spring 122, wherein one end of the spring 122 is connected with the side wall of the chute, and the other end of the spring is connected with the sliding block 121.

When the weight ring 112 can be supported on the gravity block 5 and one side of the support rod 12 abuts against the hand lever 11, the spring 122 is in a compressed state.

After the operator lifts the hand lever 11 upwards, the sliding block 121 slides under the elastic force of the spring 122 to the position right below the hand lever 11, and the supporting rod 12 is located right below the hand lever 11, after the operator lifts the hand lever 11 upwards, the spring 122 can automatically push the supporting rod 12 to the position right below the hand lever 11, and the supporting rod 12 can be moved to the position right below the hand lever 11 more conveniently.

In this embodiment, the support 6 includes two telescopic rods, both of which are telescopic structures along the axial direction thereof, and the upper ends of the two telescopic rods are fixedly connected to the outer wall of the container 1.

When the water sample is filled into the water quality monitoring storage device, as the depth degree of each sampling point is different, an operator can shrink a part of the telescopic rod when using the water quality monitoring storage device to fill the water sample at a shallower sampling point, so that the opening of the container 1 can be conveniently placed into the water. The flexibility of the water quality monitoring storage device can be improved.

In this embodiment, the telescopic rod comprises a tube body 62, an inner rod 61 and a bolt 63, wherein the upper end of the inner rod 61 is fixedly connected with the outer wall of the container 1, the lower end of the inner rod 61 is positioned in the tube body 62, the inner rod 61 is matched with the inner cavity of the tube body 62, a screw hole is formed in the side wall of the tube body 62, and the screwing end of the bolt 63 is screwed into the screw hole and abuts against the inner rod 61.

In the initial state of the water quality monitoring and storing device, the bolt 63 is screwed into the screw hole, and the screwed end of the bolt 63 abuts against the inner rod 61.

The bolt 63 is screwed out of the screw hole, and the screwed end of the bolt 63 is separated from the inner rod 61, at this time, the inner rod 61 can be slid in the inner cavity of the pipe body 62 to adjust the length of the telescopic rod. With this structure, the telescopic link is the structure that can extend and retract along its axial direction.

In this embodiment, the plugging block 2 includes a buoyancy block 23, a plate 22, and a rubber pad 21, where the buoyancy block 23 is fixedly connected to the lower end of the sliding rod 113, and the buoyancy block may be made of foam plastics. The upper end of the plate body 22 is fixedly connected with the buoyancy block 23, the lower end of the plate body 22 is adhered with the rubber pad 21, and the buoyancy block 23 can drive the plate body 22 and the rubber pad 21 to float in water.

In the process of moving the container 1 downwards in water, the lower end wall of the container 1 is separated from the rubber pad 21, and the buoyancy block 23 drives the plate body 22 and the rubber pad 21 to float in the water, namely, the average density of the combined structure of the buoyancy block 23, the plate body 22 and the rubber pad 21 is smaller than that of the water, and when the container 1 is put into the water, the buoyancy block 23, the plate body 22 and the rubber pad 21 can float on the water surface.

When an operator loosens the gravity block 5, the gravity block 5 sinks and tightens the pull rope 4, and the gravity block 5 drives the buoyancy block 23, the plate body 22 and the rubber pad 21 to move downwards until the rubber pad 21 abuts against the lower end wall of the container 1, and the rubber pad 21 can block the opening again. With this structure, the blocking piece 2 can be supported on the lower end wall of the container 1 and block the opening.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.

Claims (10)

1. The water quality monitoring storage device is characterized by comprising a container (1), a plugging block (2), a vertical rod (3), a pull rope (4), a gravity block (5) and a support (6), wherein an opening is formed in the lower end wall of the container (1), a round hole is formed in the upper end wall of the container (1), the plugging block (2) is located in the container (1) and plugs the opening, the plugging block (2) can float in water, the vertical rod (3) is fixedly arranged on the plugging block (2), the upper portion of the vertical rod (3) is slidably matched in the round hole, a pore channel (31) is formed in the vertical rod (3), the upper end of the pore channel (31) is communicated with the outer surface of the vertical rod (3) and is located in the round hole, the lower end of the pore channel (31) is communicated with the outer surface of the lower end of the vertical rod (3), the gravity block (5) is suspended on the plugging block (2) through the pull rope (4), and the support (6) is fixedly arranged on the container (1), and the lower end of the support (6) is located on the lower side of the gravity block (5).

2. The water quality monitoring and storing device according to claim 1, further comprising a sealing ring (32), wherein the sealing ring (32) is fixedly arranged on the hole wall of the round hole.

3. The water quality monitoring and storing device according to claim 1, further comprising a handle (11) and a connecting part, wherein the handle (11) is positioned above the container (1) and horizontally arranged, and the connecting part is connected with the handle (11) and the container (1).

4. The water quality monitoring and storing device according to claim 3, wherein the connecting portion comprises two sliding rods (113) and a counterweight ring (112), the two sliding rods (113) are respectively located on two opposite sides of the container (1), the sliding rods (113) can be connected with the container (1) in a vertical sliding mode, the counterweight ring (112) is fixedly connected with the lower ends of the two sliding rods (113), the two ends of the portable rod (11) are fixedly connected with the upper ends of the two sliding rods (113) in a one-to-one correspondence mode, and the pull ropes (4) are located in annular holes of the counterweight ring (112).

5. The water quality monitoring and storing device according to claim 4, wherein the connecting portion further comprises two fixing blocks (111), the two fixing blocks (111) are fixedly arranged on the container (1), the fixing blocks (111) are respectively located on two opposite sides of the container (1), through holes are formed in the two fixing blocks (111), the through holes are vertically arranged, and the two sliding rods (113) are in sliding fit in the two through holes in a one-to-one correspondence mode.

6. The water quality monitoring and storing device according to claim 3, wherein a chute is formed by downwards sinking the upper end face of the container (1), the chute is perpendicular to the length direction of the portable rod (11), one end of the chute is located under the portable rod (11), the water quality monitoring and storing device further comprises a sliding block (121) and a supporting rod (12), the sliding block (121) is in sliding fit in the chute, the lower end of the supporting rod (12) is fixedly connected with the sliding block (121), and the upper end of the supporting rod (12) is used for supporting the portable rod (11).

7. The water quality monitoring and storing device according to claim 6, further comprising a spring (122), wherein one end of the spring (122) is connected with the side wall of the chute, and the other end of the spring is connected with the sliding block (121).

8. The water quality monitoring and storing device according to claim 1, wherein the bracket (6) comprises two telescopic rods, the two telescopic rods are of a structure capable of extending and contracting along the axial direction of the telescopic rods, and the upper ends of the two telescopic rods are fixedly connected with the outer wall of the container (1).

9. The water quality monitoring and storing device according to claim 8, wherein the telescopic rod comprises a pipe body (62), an inner rod (61) and a bolt (63), the upper end of the inner rod (61) is fixedly connected with the outer wall of the container (1), the lower end of the inner rod (61) is positioned in the pipe body (62), the inner rod (61) is matched with the inner cavity of the pipe body (62), a screw hole is formed in the side wall of the pipe body (62), and the screwing end of the bolt (63) is screwed into the screw hole and abuts against the inner rod (61).

10. The water quality monitoring and storing device according to claim 5, wherein the blocking block (2) comprises a buoyancy block (23), a plate body (22) and a rubber pad (21), the buoyancy block (23) is fixedly connected to the lower end of the sliding rod (113), the upper end of the plate body (22) is fixedly connected with the buoyancy block (23), the rubber pad (21) is adhered to the lower end of the plate body (22), and the buoyancy block (23) can drive the plate body (22) and the rubber pad (21) to float in water.