CN219870486U - Multi-point sampling device for water quality detection - Google Patents

Abstract

The utility model discloses a multipoint sampling device for water quality detection, which comprises a ship edge anti-blocking paying-off structure, a sampling depth limiting device and a negative pressure water quality sampling device. The utility model belongs to the technical field of water quality sampling equipment; according to the characteristic that the pressures of water areas with different depths are different, the design effect of automatically opening a switch to take water and sample in the water areas with different depths is realized on the premise of no electrical equipment by combining the spring with the unidirectional diversion pipeline; the kinetic energy of water flow is matched with a turbine, so that the problem that a water inlet is blocked by sundries in the water sample taking process is avoided by the rotational kinetic energy of the turbine; the plumb of paying-off equipment is also set to be a turbine structure, and the water flow belt rotates, so that the plumb falls down to drive energy, and obstacles encountered in the falling process can be effectively avoided.

Description

Multi-point sampling device for water quality detection

Technical Field

The utility model belongs to the technical field of water quality sampling equipment, and particularly relates to a multipoint sampling device for water quality detection.

Background

When water quality sampling is carried out on a river, firstly, proper sampling points are selected to cover different water flow speeds, depths and static areas; meanwhile, the water conditions in the river channel are complex, the floaters are numerous, and the sampling equipment is required to avoid the obstacle; the water sources with different depths in the fixed-point water area are sampled.

The prior application number is CN201811217798.X, the utility model application of the name of the water quality sampler realizes the on-off adjustment of the liquid inlet through a control valve, and the equipment has simple structure, low cost and easy popularization; but this equipment passes through electrical equipment control, and the energy consumption is high, and the while equipment adopts the water sample to get once, and the time consuming time is long to the water source sampling of different degree of depth, and simultaneously when the aquatic impurity is more, the water inlet is once blockked up by the impurity of large tracts of land or the interior being filled by a large amount of floaters of sampling equipment, then directly influences the quality of water that is sampled.

Disclosure of Invention

Aiming at the situation, in order to overcome the defects of the prior art, the utility model provides the multipoint sampling device for water quality detection, and according to the characteristic that the pressure of water areas with different depths is different, the design effect of automatically opening a switch to take water and sample in the water areas with different depths is realized on the premise of no electrical equipment by combining the spring with the unidirectional diversion pipeline; the kinetic energy of water flow is matched with a turbine, so that the problem that a water inlet is blocked by sundries in the water sample taking process is avoided by the rotational kinetic energy of the turbine; the plumb of paying-off equipment is also set to be a turbine structure, and the water flow belt rotates, so that the plumb falls down to drive energy, and obstacles encountered in the falling process can be effectively avoided.

The technical scheme adopted by the utility model is as follows: the utility model provides a multipoint sampling device for water quality detection, which comprises a ship edge anti-blocking paying-off structure, a sampling depth limiting device and a negative pressure water quality sampling device, wherein the sampling depth limiting device is arranged on the ship edge anti-blocking paying-off structure, and the negative pressure water quality sampling device is connected with the sampling depth limiting device; negative pressure water sampling device includes water sampling jar, prevents blocking rotary filter, water sample exhaust structure and adjustable water sampling structure, water sampling jar is connected with sampling depth stop device, prevent blocking rotary filter setting on the outer wall of water sampling jar, water sample exhaust structure fixes on the diapire of water sampling jar, adjustable water sampling structure fixes on water sampling jar.

Further, adjustable quality of water sampling structure includes one-way sampling pipe, sampling spacing ball, sampling depth spacing spring, rice font baffle, degree of depth regulation pole, liquid sampling return bend, sampling thread groove and sampling screw thread post, one-way sampling pipe is fixed on the lateral wall of quality of water sampling jar, sampling spacing ball block slides and sets up in one-way sampling pipe, sampling depth spacing spring links to each other with the sampling spacing ball, rice font baffle sets up on sampling depth spacing spring, degree of depth regulation pole and rice font baffle fixed connection, liquid sampling return bend and one-way sampling pipe fixed connection, degree of depth regulation pole block slides and runs through the setting on liquid sampling return bend, sampling thread groove links to each other with liquid sampling return bend, sampling thread post is fixed on the degree of depth regulation pole, be equipped with the sealing washer between sampling thread post and the quality of water sampling jar.

Further, prevent blockking up rotary filter and include hemisphere filter screen, filter screen annular fixture block, annular draw-in groove and prevent blockking up the flabellum, the annular draw-in groove sets up on the lateral wall of water sampling jar, the rotation of filter screen annular fixture block sets up on annular draw-in groove, hemisphere filter screen is fixed on filter screen annular fixture block, prevent blockking up the flabellum setting on hemisphere filter screen.

Further, the water sample discharge structure comprises a discharge guide pipe, a liquid outlet pipe, a liquid discharge limiting ball, a liquid discharge bolt and a liquid outlet rubber plug, wherein the discharge guide pipe is fixed on the bottom wall of the water quality sampling tank, the liquid outlet pipe is fixed on the side wall of the discharge guide pipe, the liquid discharge limiting ball is clamped and slides in the discharge guide pipe, the liquid discharge bolt is connected with the liquid discharge limiting ball, the liquid outlet rubber plug is movably connected with the liquid outlet pipe, and the liquid discharge bolt is in threaded connection with the discharge guide pipe.

Preferably, the bottom wall of the water quality sampling tank is arranged to be of a hemispherical structure.

Further, the sampling depth stop device includes degree of depth adjustment gyro wheel, half limiting plate, adjusting pull rod, wheel interval adjusting support, wheel interval slip triangular block, wheel interval limit triangular block and triangular slide groove, degree of depth adjustment gyro wheel is connected with the ship along preventing hindering unwrapping wire structure contact, half limiting plate is connected with the degree of depth adjustment gyro wheel, half limiting plate is equipped with two sets of, the one end and the half limiting plate of wheel interval adjusting support are connected, wheel interval adjusting support block slides and sets up on another set of half limiting plate, the triangular slide groove sets up on half limiting plate, wheel interval slide triangular block is fixed on wheel interval adjusting support, wheel interval limit triangular block slides and sets up on the triangular slide groove, adjusting pull rod is fixed on wheel interval limit triangular block, wheel interval slide triangular block is connected with wheel interval limit triangular block contact.

Further, ship edge anti-blocking paying-off structure includes ship edge crane, paying-off shaft, lofting line, bearing housing, toper tup and flabellum piece, ship edge crane sets up on the hull, the paying-off shaft is connected with ship edge crane, lofting line's one end is connected with ship edge crane, the bearing housing is connected with lofting line's the other end, toper tup block rotates and sets up on the bearing housing, flabellum piece sets up on the lateral wall of toper tup.

Further, the front end of the conical hammer head is provided with a weighting block, and the weighting block is of a hemispherical structure.

Further, a lantern ring is arranged on the half-open limiting plate.

Further, a lock catch is arranged between the half-open limiting plate and the water quality sampling tank, and the lock catch is connected with a lantern ring on the half-open limiting plate.

Further, two sets of half open and be equipped with two sets of degree of depth regulating roller on the limiting plate respectively, two sets of half open the degree of depth regulating roller dislocation on the limiting plate and arrange, the degree of depth regulating roller that both sides dislocation was arranged, when two sets of half open limiting plate are close to, make the area of contact between degree of depth regulating roller and the lofting line increase, the frictional force of degree of depth regulating roller and lofting line increases, and fixed effect is better.

Further, a protrusion is arranged on the middle groove of the depth adjusting roller.

The multipoint sampling device for water quality detection has the beneficial effects that:

(1) The pressure between the unidirectional sampling tube and the sampling limit ball is adjusted by mutually coordinating the sampling depth limit spring and the sampling thread column so as to meet the design requirements of automatic water taking and sampling under different water pressures;

(2) The hemispherical filter screen and the anti-blocking fan blades are combined to form a group of turbines, when an external water source enters the water quality sampling tank through the unidirectional sampling pipe, the anti-blocking fan blades are impacted to obtain pressure, the hemispherical filter screen is driven to rotate, and the surface attachments of the anti-blocking fan blades are separated from the hemispherical filter screen in a rotating way;

(3) The bottom wall of the water quality sampling tank is of an arc-shaped structure, so that the resistance in the descending process of the water quality sampling tank is reduced, and the equipment moves to a sampling area faster;

(4) The surface of the depth adjusting roller is provided with a convex structure, when the depth adjusting roller extrudes the lofting line, the resistance of the lofting line and the depth adjusting roller is increased, and the fixing effect of the water quality sampling tank on the half-open limiting plate is improved;

(5) The meshing connection mode between the wheel spacing sliding triangular blocks and the wheel spacing limiting triangular plates enables the two groups of half-open limiting plates to have a self-locking effect.

Drawings

FIG. 1 is a front view of a multipoint sampling device for water quality detection according to the present utility model;

FIG. 2 is a front cross-sectional view of a negative pressure water sampling device;

FIG. 3 is a top cross-sectional view of a negative pressure water sampling device;

FIG. 4 is an enlarged view of a portion of the negative pressure water sampling device of section C of FIG. 1;

FIG. 5 is a schematic perspective view of a water quality sampling tank;

FIG. 6 is a schematic diagram of a connection structure of a wheel spacing sliding triangle and a wheel spacing limiting triangle;

FIG. 7 is a schematic diagram of the structure of the rice-shaped baffle, depth adjustment rod and sampling screw column;

FIG. 8 is a schematic perspective view of a depth adjustment roller;

fig. 9 is a partial enlarged view of a portion a in fig. 2.

The ship edge anti-blocking paying-off structure comprises 1, a sampling depth limiting device, 3, a negative pressure water quality sampling device, 4, a water quality sampling tank, 5, an anti-blocking rotary filter, 6, a water sample discharging structure, 7, an adjustable water quality sampling structure, 8, a one-way sampling tube, 9, a sampling limiting ball, 10, a sampling depth limiting spring, 11, a meter-shaped baffle plate, 12, a depth adjusting rod, 13, a liquid sampling elbow, 14, a sampling thread groove, 15, a sampling thread column, 16, a hemispherical filter screen, 17, a filter screen annular clamping block, 18, an annular clamping groove, 19, anti-blocking fan blades, 20, a discharging guide tube, 21, a liquid outlet tube, 22, a liquid discharging limiting ball, 23, a liquid discharging bolt, 24, a liquid outlet rubber plug, 25, a depth adjusting roller, 26, a semi-open limiting plate, 27, an adjusting pull rod, 28, a wheel space adjusting bracket, 29, a wheel space sliding triangular block, 30, a wheel space limiting triangular plate, 31, a triangular plate, 32, a ship edge corner plate, 33, a wire releasing spool, 34, a wire, 35, a bearing sleeve, 36, a conical hammer head, a fan blade 37 and a fan blade.

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all 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.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientation or positional relationships based on those shown in the drawings, merely to facilitate description of the utility model and simplify 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 thus should not be construed as limiting the utility model.

As shown in fig. 1, 4 and 6, the multipoint sampling device for water quality detection provided by the utility model comprises a ship edge anti-blocking paying-off structure 1, a sampling depth limiting device 2 and a negative pressure water quality sampling device 3, wherein the sampling depth limiting device 2 is arranged on the ship edge anti-blocking paying-off structure 1, and the negative pressure water quality sampling device 3 is connected with the sampling depth limiting device 2.

As shown in fig. 1, the ship edge anti-blocking paying-off structure 1 comprises a ship edge crane 32, a paying-off shaft 33, a lofting line 34, a bearing sleeve 35, a conical hammer 36 and fan blades 37, wherein the ship edge crane 32 is arranged on a ship body, the paying-off shaft 33 is connected with the ship edge crane 32, one end of the lofting line 34 is connected with the ship edge crane 32, the bearing sleeve 35 is connected with the other end of the lofting line 34, the conical hammer 36 is clamped and rotated on the bearing sleeve 35, and the fan blades 37 are arranged on the side walls of the conical hammer 36.

As shown in fig. 1, 6 and 8, the sampling depth limiting device 2 comprises a depth adjusting roller 25, a half-open limiting plate 26, an adjusting pull rod 27, a wheel spacing adjusting bracket 28, a wheel spacing sliding triangular block 29, a wheel spacing limiting triangular plate 30 and a triangular plate sliding groove 31, wherein the depth adjusting roller 25 is in contact connection with a lofting line 34, the half-open limiting plate 26 is connected with the depth adjusting roller 25, two groups of half-open limiting plates 26 are arranged, one end of the wheel spacing adjusting bracket 28 is connected with one group of half-open limiting plates 26, the wheel spacing adjusting bracket 28 is arranged on the other group of half-open limiting plates 26 in a clamping sliding manner, the triangular plate 29 is fixed on the wheel spacing adjusting bracket 28, the wheel spacing limiting triangular plate 30 is arranged on the triangular plate sliding groove 31 in a clamping manner, the adjusting pull rod 27 is fixed on the wheel spacing triangular plate 30, and the wheel spacing sliding triangular block 29 is in contact connection with the wheel spacing triangular plate 30.

As shown in fig. 1, 2, 3 and 4, the negative pressure water sampling device 3 comprises a water sampling tank 4, an anti-blocking rotary filter 5, a water sample discharging structure 6 and an adjustable water sampling structure 7, wherein the water sampling tank 4 is connected with a sampling depth limiting device 2, the anti-blocking rotary filter 5 is arranged on the outer wall of the water sampling tank 4, the water sample discharging structure 6 is fixed on the bottom wall of the water sampling tank 4, and the adjustable water sampling structure 7 is fixed on the water sampling tank 4.

As shown in fig. 2, 3 and 7, the adjustable water quality sampling structure 7 comprises a unidirectional sampling tube 8, a sampling limiting ball 9, a sampling depth limiting spring 10, a meter-shaped baffle 11, a depth adjusting rod 12, a liquid sampling elbow 13, a sampling thread groove 14 and a sampling thread column 15, wherein the unidirectional sampling tube 8 is fixed on the side wall of the water quality sampling tank 4, the sampling limiting ball 9 is clamped and slidingly arranged in the unidirectional sampling tube 8, the sampling depth limiting spring 10 is connected with the sampling limiting ball 9, the meter-shaped baffle 11 is arranged on the sampling depth limiting spring 10, the depth adjusting rod 12 is fixedly connected with the meter-shaped baffle 11, the liquid sampling elbow 13 is fixedly connected with the unidirectional sampling tube 8, the depth adjusting rod 12 is clamped and slidingly penetrated on the liquid sampling elbow 13, the sampling thread groove 14 is connected with the liquid sampling elbow 13, the sampling thread column 15 is fixed on the depth adjusting rod 12, and a sealing ring is arranged between the sampling thread column 15 and the water quality sampling tank 4.

As shown in fig. 2 and 5, the anti-blocking rotary filter 5 comprises a hemispherical filter screen 16, a filter screen annular clamping block 17, an annular clamping groove 18 and anti-blocking fan blades 19, wherein the annular clamping groove 18 is arranged on the side wall of the water quality sampling tank 4, the filter screen annular clamping block 17 is clamped and rotated to be arranged on the annular clamping groove 18, the hemispherical filter screen 16 is fixed on the filter screen annular clamping block 17, and the anti-blocking fan blades 19 are arranged on the hemispherical filter screen 16.

As shown in fig. 9, the water sample discharging structure 6 comprises a discharging guide pipe 20, a liquid outlet pipe 21, a liquid discharging limiting ball 22, a liquid discharging bolt 23 and a liquid outlet rubber plug 24, wherein the discharging guide pipe 20 is fixed on the bottom wall of the water quality sampling tank 4, the liquid outlet pipe 21 is fixed on the side wall of the discharging guide pipe 20, the liquid discharging limiting ball 22 is clamped and slides in the discharging guide pipe 20, the liquid discharging bolt 23 is connected with the liquid discharging limiting ball 22, the liquid outlet rubber plug 24 is movably connected with the liquid outlet pipe 21, and the liquid discharging bolt 23 is in threaded connection with the discharging guide pipe 20.

As shown in fig. 2, the bottom wall of the water quality sampling tank 4 is provided in a hemispherical structure.

As shown in fig. 1, the front end of the tapered hammer head 36 is provided with a weighting block, and the weighting block is provided in a hemispherical structure.

As shown in fig. 1, a collar is provided on the half-open limiting plate 26.

As shown in fig. 1 and 4, a lock catch is arranged between the half-open limiting plate 26 and the water quality sampling tank 4, and the lock catch is connected with a lantern ring on the half-open limiting plate 26.

As shown in fig. 6, two sets of depth adjusting rollers 25 are respectively arranged on the two sets of half-open limiting plates 26, and the depth adjusting rollers 25 on the two sets of half-open limiting plates 26 are arranged in a staggered manner.

As shown in fig. 8, a protrusion is provided on the middle groove of the depth adjusting roller 25.

When the device is specifically used, the river channel depth is firstly determined, the sampling depth is determined according to the river channel depth, the depth adjusting roller 25 moves along the lofting line 34, the half-open limiting plates 26 move to a proper position, the two half-open limiting plates 26 are pressed, the wheel spacing adjusting bracket 28 enables the wheel spacing sliding triangular block 29 to slide along the wheel spacing limiting triangular plate 30, the wheel spacing limiting triangular plate 30 is perpendicular to the wheel spacing adjusting bracket 28 and slides in the triangular plate sliding groove 31, the lofting line 34 deforms, and the depth adjusting roller 25 is fixed on the lofting line 34; sequentially adjusting the positions of the half-open limiting plates 26 on the lofting line 34, rotating the depth adjusting rod 12 on the water quality sampling tank 4, rotating the sampling threaded column 15 according to the depth required to be detected, rotating the sampling threaded column 15 more the deeper the sampling depth is, and fixing the adjusted water quality sampling tank 4 on the half-open limiting plates 26 through a lock catch; the ship is fixed at the ship side along the crane 32, the lofting line 34 can be put into water from the ship side, the conical hammerhead 36 is downward, pressure is generated on the fan blades 37 in a river flow state, rotation is generated in the descending process of the conical hammerhead 36, when partial plastic products or putrefying plants are met, the rotating conical hammerhead 36 slides along barriers, or the barriers are pressed to incline, the conical hammerhead 36 is driven to continuously fall down a riverbed, when the water quality sampling tank 4 moves to a proper height, the pressure of the sampling depth limiting spring 10 to the sampling limiting ball 9 is smaller than the pressure under water, the sampling limiting ball 9 moves, river water passes through the liquid sampling elbow pipe 13 and flows into the water quality sampling tank 4, in the process, due to the water flow in the front and back directions of the hemispherical filter screen 16, the anti-blocking fan blades 19 are stressed, the hemispherical filter screen 16 rotates along the annular clamping groove 18, the wastes in the river channel are prevented from being blocked by the annular clamping groove 17, the unidirectional filter screen 8 is prevented from being blocked, the lofting line 34 is prevented, the outside the water quality sampling tank 4 starts to fall down along with the lifting the water quality sampling limiting ball, the sampling pipe 9 is smaller than the pressure of the sampling limiting ball 10, when the sampling pipe 9 moves to the sampling pipe is at the proper height, the liquid drain pipe 21 is inclined, the drain pipe is discharged from the liquid drain pipe 21, and the drain pipe 21 is discharged from the sampling pipe 21, and the drain pipe is discharged from the sampling pipe is rotated, and the drain pipe 21, and the drain pipe is discharged from the drain pipe and the drain pipe.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

The utility model and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims (10)

1. A multipoint sampling device for water quality detection is characterized in that: the device comprises a ship edge anti-blocking paying-off structure (1), a sampling depth limiting device (2) and a negative pressure water quality sampling device (3), wherein the sampling depth limiting device (2) is arranged on the ship edge anti-blocking paying-off structure (1), and the negative pressure water quality sampling device (3) is connected with the sampling depth limiting device (2); negative pressure water sampling device (3) are including quality of water sampling jar (4), prevent blockking rotary filter (5), water sample exhaust structure (6) and adjustable quality of water sampling structure (7), quality of water sampling jar (4) are connected with sample depth stop device (2), prevent blockking rotary filter (5) setting on the outer wall of quality of water sampling jar (4), water sample exhaust structure (6) are fixed on the diapire of quality of water sampling jar (4), adjustable quality of water sampling structure (7) are fixed on quality of water sampling jar (4).

2. The multipoint sampling device for water quality detection according to claim 1, wherein: the adjustable water quality sampling structure (7) comprises a one-way sampling tube (8), a sampling limiting ball (9), a sampling depth limiting spring (10), a meter-shaped baffle (11), a depth adjusting rod (12), a liquid sampling elbow (13), a sampling thread groove (14) and a sampling thread column (15), wherein the one-way sampling tube (8) is fixed on the side wall of a water quality sampling tank (4), the sampling limiting ball (9) is clamped and slidingly arranged in the one-way sampling tube (8), the sampling depth limiting spring (10) is connected with the sampling limiting ball (9), the meter-shaped baffle (11) is arranged on the sampling depth limiting spring (10), the depth adjusting rod (12) is fixedly connected with the meter-shaped baffle (11), the liquid sampling elbow (13) is fixedly connected with the one-way sampling tube (8), the depth adjusting rod (12) is clamped and slidingly penetrated and arranged on the liquid sampling elbow (13), the sampling thread groove (14) is connected with the liquid sampling elbow (13), and the sampling thread column (15) is fixedly arranged on the depth adjusting rod (12), and a sealing ring is arranged between the water quality sampling tank (4).

3. The multipoint sampling device for water quality detection according to claim 2, wherein: anti-blocking rotary filter (5) are including hemisphere filter screen (16), filter screen annular fixture block (17), annular draw-in groove (18) and anti-blocking flabellum (19), annular draw-in groove (18) set up on the lateral wall of quality of water sampling jar (4), filter screen annular fixture block (17) block rotation sets up on annular draw-in groove (18), hemisphere filter screen (16) are fixed on filter screen annular fixture block (17), anti-blocking flabellum (19) set up on hemisphere filter screen (16).

4. A multipoint sampling device for water quality testing according to claim 3, wherein: the water sample discharge structure (6) comprises a discharge guide pipe (20), a liquid outlet pipe (21), a liquid discharge limiting ball (22), a liquid discharge bolt (23) and a liquid outlet rubber plug (24), wherein the discharge guide pipe (20) is fixed on the bottom wall of the water quality sampling tank (4), the liquid outlet pipe (21) is fixed on the side wall of the discharge guide pipe (20), the liquid discharge limiting ball (22) is clamped and slides in the discharge guide pipe (20), the liquid discharge bolt (23) is connected with the liquid discharge limiting ball (22), the liquid outlet rubber plug (24) is movably connected with the liquid outlet pipe (21), and the liquid discharge bolt (23) is in threaded connection with the discharge guide pipe (20).

5. The multipoint sampling device for water quality testing according to claim 4, wherein: the bottom wall of the water quality sampling tank (4) is of a hemispherical structure.

6. The multipoint sampling device for water quality testing according to claim 5, wherein: the ship edge anti-blocking paying-off structure (1) comprises a ship edge crane (32), a paying-off shaft (33), a lofting line (34), a bearing sleeve (35), a conical hammer head (36) and fan blades (37), wherein the ship edge crane (32) is arranged on a ship body, the paying-off shaft (33) is connected with the ship edge crane (32), one end of the lofting line (34) is connected with the ship edge crane (32), the bearing sleeve (35) is connected with the other end of the lofting line (34), the conical hammer head (36) is clamped and rotated to be arranged on the bearing sleeve (35), and the fan blades (37) are arranged on the side wall of the conical hammer head (36).

7. The multipoint sampling device for water quality testing according to claim 6, wherein: the utility model provides a sampling depth stop device (2) is including degree of depth regulating roller (25), half limiting plate (26), adjusting pull rod (27), wheel interval adjusting bracket (28), wheel interval slip triangular block (29), wheel interval limit triangular plate (30) and triangular plate sliding groove (31), degree of depth regulating roller (25) are connected with lofting line (34) contact, half limiting plate (26) are connected with degree of depth regulating roller (25), half limiting plate (26) are equipped with two sets of, the one end and the a set of half limiting plate (26) of wheel interval adjusting bracket (28) are connected, wheel interval adjusting bracket (28) block sliding set up on another set of half limiting plate (26), triangular plate sliding groove (31) set up on half limiting plate (26), wheel interval slip triangular block (29) are fixed on wheel interval adjusting bracket (28), wheel interval limit triangular plate (30) block sliding set up on triangular plate sliding groove (31), adjusting wheel interval (27) are fixed on triangular plate (30) contact spacing triangular plate sliding groove (30).

8. The multipoint sampling device for water quality testing according to claim 7, wherein: the front end of the conical hammer head (36) is provided with a weighting block, and the weighting block is of a hemispherical structure.

9. The multipoint sampling device for water quality testing according to claim 8, wherein: a lantern ring is arranged on the half-open limiting plate (26); a lock catch is arranged between the half-open limiting plate (26) and the water quality sampling tank (4), and the lock catch is connected with a lantern ring on the half-open limiting plate (26).

10. The multipoint sampling device for water quality testing according to claim 9, wherein: two groups of depth adjusting rollers (25) are respectively arranged on the two groups of half-open limiting plates (26), and the depth adjusting rollers (25) on the two groups of half-open limiting plates (26) are arranged in a staggered manner; the middle groove of the depth adjusting roller (25) is provided with a bulge.