Water quality detection sample extraction device

Abstract

The invention discloses a water quality detection sample extraction device, and relates to the technical field of water sampling, the water quality detection sample extraction device comprises a peristaltic pump, a peristaltic pipe is installed on the peristaltic pump, one end of the peristaltic pipe is in butt joint with an extension pipe, the other end of the extension pipe is detachably connected with a sieve pipe, and a sieve plate is slidably arranged on the inner wall of the water inlet end of the sieve pipe in the axial direction; a main shaft collinear with the axis of the screen pipe is rotationally installed in the screen pipe through a bearing, one end, away from the screen plate, of the main shaft is fixedly connected with a paddle, the other end of the main shaft is hinged to a winding rod, a through hole is formed in the center of the screen plate, the winding rod penetrates through the through hole, and the screen plate does not break away from the winding rod all the time in the moving process. According to the water quality detection sample extraction device, the paddle and the winding rod are arranged in the screen pipe, aquatic plants can be intercepted before making contact with the screen plate, due to the fact that power comes from negative pressure generated by the pump, additional power is not needed, screen holes can be prevented from being blocked, meanwhile, the aquatic plants can be automatically cleaned through the screen plate after stopping, and the water quality detection sample extraction device is convenient to use. And subsequent use is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of water sampling, in particular to a water quality detection sample extraction device. Background Art

[0002] Water is the source of life. Human beings cannot live without water in their daily life and production activities. The quality of water has become the focus of people's attention. In water quality testing, it is necessary to collect samples from the water area and analyze them to obtain the water quality of the area. The existing water sample extraction is mainly composed of peristaltic pumps, peristaltic tubes, extension tubes, floats and screen tubes. Figure 1 The peristaltic tube is installed in the peristaltic pump, the two ends of the peristaltic tube are respectively connected to the sample container and the extension tube, the other end of the extension tube is connected to the screen tube, and the float is set on the extension tube to control the depth of the screen tube in the water area.

[0003] See also Figure 2 The existing sieve tube is a tubular body with one end connected to an extension tube and a sieve hole on the side wall. The sieve hole is simple, convenient and practical. However, if there are a lot of aquatic plants in the sampling water area, the aquatic plants, especially vine aquatic plants, are easy to get stuck at the sieve hole when the peristaltic pump is working. The aquatic plants entering the sieve tube will also entangle with each other, which not only affects the efficiency of the sample extraction process, but also makes it difficult to clean the aquatic plants stuck in the sieve hole after the sample is extracted. To this end, we propose a water quality detection sample extraction device. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a water quality testing sample extraction device.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a water quality detection sample extraction device, comprising a peristaltic pump, a peristaltic tube is installed on the peristaltic pump, one end of the peristaltic tube is connected to an extension tube, and the other end of the extension tube is detachably connected to a screen tube, the screen tube is a hollow tubular body with openings at both ends, a screen plate is provided on the inner wall of the water inlet end of the screen tube for axial sliding, a main shaft colinear with the axis of the screen tube is rotatably installed in the screen tube through a bearing, a paddle is fixedly connected to one end of the main shaft away from the sieve plate, a winding rod is hinged at the other end of the main shaft, the hinge point between the winding rod and the main shaft is not on the axis of the main shaft, the paddle drives the winding rod when rotating with the water flow, the winding rod is unfolded under the action of centrifugation, a through hole is opened at the center of the sieve plate, the winding rod passes through the through hole and the sieve plate does not separate from the winding rod during its movement.

[0006] Preferably, the winding rods are provided in at least two groups and are evenly distributed on the main shaft.

[0007] Preferably, the winding rod rotates in a plane where the main shaft and the hinge point of the winding rod are located, and a force-applying part for applying a force to the winding rod away from the main shaft axis is also provided in the screen tube.

[0008] Preferably, a downwardly inclined elastic rod is fixed to the movable end of the winding rod, and a protruding ring is integrally provided at the center of the lower end surface of the screen plate. The protruding ring is coaxial with the through hole and the inner wall is continuous. When no water is added, the elastic rod is located in the protruding ring and the through hole area.

[0009] Preferably, the axes of the elastic rod and the protruding ring are coplanar, and the elastic rod abuts against the side wall of the protruding ring and bends toward the winding rod during the sliding process of the screen plate.

[0010] Preferably, the outer side wall of the winding rod is provided with a semi-annular groove distributed along the axial direction, and the elastic rod is arranged in the semi-annular groove. When the screen plate reaches the bottom, the elastic rod is bent and completely accommodated in the semi-annular groove.

[0011] Preferably, at least one bending portion is provided on the elastic rod, and the bending portion is inclined upward when the winding rod is at a maximum unfolding angle and the elastic rod is in a natural state.

[0012] Preferably, the inner surface of the sieve holes on the sieve plate is in the shape of an annular blade.

[0013] Compared with the prior art, the present invention provides a water quality testing sample extraction device, which has the following beneficial effects: (1) The present invention can intercept water plants before they touch the screen plate by arranging paddles and winding rods in the screen tube. Since the power comes from the negative pressure generated by the pump, no additional power is required, which can avoid clogging of the screen holes and automatically clean the water plants after stopping, which is convenient for subsequent use. (2) The present invention provides an elastic rod on the winding rod, which can effectively entangle the aquatic plants, thereby improving the interception efficiency and not affecting the subsequent cleaning process; (3) The bent portion provided in the present invention further intercepts the non-entangled aquatic plants and hangs the aquatic plants, thereby preventing the sieve holes of the sieve plate from being filled with aquatic plants and causing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the prior art; Figure 2 It is a schematic diagram of the screen tube structure in the prior art; Figure 3 It is a schematic diagram of the cross-section internal structure of the screen tube of the present invention; Figure 4 This is a schematic diagram of the water flow state in the cross-section of the screen tube; Figure 5It is a schematic diagram of the state of water plants being entangled when the winding rod rotates; Figure 6 This is a cross-sectional diagram of the screen plate moving down to clean the waterweed; Figure 7 Schematic diagram of the state where the screen plate moves downward to clean the water weeds and reaches the elastic rod and generates compression; Figure 8 for Figure 7 Non-section view of the winding rod in the state; Fig. 9 The end view of the winding rod is an elastic rod in an uncompressed state; Fig.10 An angle view of the winding rod, the elastic rod and the bending part.

[0015] In the figure: 1-peristaltic pump; 2-peristaltic tube; 3-extension tube; 4, 4'-sieve tube; 5-sieve plate; 51-through hole; 501-protruding ring; 6-main shaft; 7-paddle; 8-winding rod; 81-semi-annular groove; 9-elastic rod; 901-bending part; 10-float. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0017] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The present invention provides a technical solution: a water quality detection sample extraction device, comprising a peristaltic tube 2 that is engaged with a peristaltic pump 1, and the peristaltic pump 1 generates negative pressure to generate negative pressure in the peristaltic tube 2. There are two types of existing peristaltic pumps 1, one is a desktop type that is taken by a handle. Such general tools are large and can be used for a long time, and the other is a handheld type that is relatively small, but due to battery reasons, the battery life is short. One end of the peristaltic tube 2 is connected to an extension tube 3 by a snap-fit ​​or threaded manner, and the other end is inserted into a sample container. The other end of the extension tube 3 is also detachably connected to a screen tube 4. One end of the extension tube 4 connected to the screen tube 4 is inserted into the water area for sampling. A float is fitted on the extension tube 3 and can be fixedly arranged. The float floats on the water surface of the water area to control the sampling depth. The existing screen tube 4' is a hollow tube with an open end, and the open end is detachably connected to the extension tube, and a screen hole is provided on the side wall of the tube body. The screen tube 4 of the present scheme is a hollow tube with two ends open, one end of which is butted with the extension tube 3, and a screen plate 5 is provided on the inner side wall of the other end along its axial sliding direction. The cross-sections of the screen plate 5 and the screen tube 4 are preferably circular. A bracket is fixed to the inner wall of the middle of the screen tube 4, and a main shaft 6 is installed on the bracket through a bearing. A paddle is installed at one end of the main shaft away from the screen plate 5, and a winding rod 8 is hinged at the other end. The hinge point of the winding rod 8 is not located on the axis of the main shaft 6, so that the winding rod 8 is driven to rotate when the main shaft 6 rotates, and the non-hinged end of the winding rod 8 is expanded in the circumferential direction. like Figure 4 As shown, after the peristaltic pump 1 starts to work, the negative pressure causes water to flow into the screen tube 4 from one end where the screen plate 5 is provided. The directional flow of water in the screen tube 4 drives the blades, thereby driving the main shaft 6 to rotate. Figure 3 In the state, it rotates counterclockwise. At the same time, because the water flows through the sieve plate 5, it has an upward thrust on the sieve plate 5, causing it to move upward. When it moves upward to the position of the bracket, the winding rod 8 breaks away from the restriction of the side wall of the through hole 51 and expands circumferentially under the influence of the centrifugal force of the rotation of the main shaft 6, forming a Figure 5When water plants or non-granular garbage enter the screen tube 4 with the water flow, the rotating winding rod 8 will wind around the water plants, thereby preventing the water plants from clogging the screen holes. After the sampling is completed, the peristaltic pump stops working, and when the screen tube 4 and the extension tube 3 are taken out from the water area, the water in the tube will flow back due to gravity, causing the screen plate 5 to move downward. During the downward movement, the winding rod 8 will be reduced through the through hole 5 until it is reset. The diameter of the through hole 5 is slightly larger than the maximum movable diameter of the outer wall of the winding rod 8 rotating in the vertical state, and when the sieve plate 5 moves downward, it will also push the water plants on the winding rod 8 to slide relative to the winding rod 8, thereby separating the two and realizing automatic cleaning. A limit is set at the end of the sieve plate 5 of the sieve tube 4 to limit the sliding range of the sieve plate 5 to prevent the winding rod 8 from separating from the sieve plate 5. The limit adopts a movable connection method, such as being set to an annular limit, which is connected to the inner wall of the sieve tube 4 by a threaded method, which is convenient for disassembly. In special circumstances such as excessive or tight entanglement of water plants, the sieve plate 5 is removed for manual cleaning. Because during sampling, the sieve plate 5 is moved upward and the winding rod 8 rotates, so that the water plants are first wrapped around the winding rod to prevent them from getting stuck in the sieve holes of the sieve plate 5.

[0018] The inner surface of the sieve hole on the sieve plate 5 is in the shape of an annular blade, that is, the inner wall of the sieve hole of the sieve plate 5 forms a knife edge, which cuts the small pieces of water plants stuck in it. Because the water flow under the sieve plate 5 moves in a circular direction, the water plants on the lower end surface of the sieve plate 5 will be pulled, which can achieve the cutting effect and avoid blockage.

[0019] See also Figure 5 Multiple groups of winding rods 8 are axially symmetrically arranged and evenly distributed at the end of the main shaft 6. A single winding rod 8 can only deviate to one side due to centrifugal force when rotating, which causes unbalanced force on the main shaft 6. Secondly, a single winding rod 8 is not easy to entangle aquatic plants when rotating, and it only plays a stirring role. Setting two or more groups will be more conducive to the attachment and entanglement of aquatic plants.

[0020] The rotation direction of the winding rod 8 connected in an articulated manner is multi-directional, and it expands outward under the action of centrifugal force. However, the overall force condition in the water area is complex, and the movement of the winding rod 8 will be deviated, and even two winding rods 8 may touch each other to form a cross. If the intersection is entangled by water plants, it is difficult to be cleaned by the screen plate 5 under the reverse push of the water flow. Therefore, the winding rod 8 is similar to the opening and contraction of the umbrella frame to be oriented, that is, the shaft connection method is adopted; When the sieve plate 5 moves downward to clean the aquatic plants on the winding rod 8, if the winding rod 8 does not have a certain radial outward force, when the aquatic plants are only wrapped around a single winding rod 8 and are wrapped relatively tightly, the edge of the through hole 51 port will slide directly from the aquatic plants and will not play a pushing role, resulting in unclean cleaning of the aquatic plants. The force-applying part adopts a torsion spring and is installed at the shaft end of the shaft connection, or an elastic part is provided between the winding rod 8 and the main shaft as a force-applying part, or a magnetic part is provided between two adjacent winding rods 8 to make them have mutual repulsion. In this way, during the downward movement of the sieve plate 5, the outer wall of the winding rod 8 is always in contact with the lower edge of the through hole 51 and is subjected to extrusion force, which is more conducive to cleaning the vines on the winding rod 8.

[0021] See also Figure 6 , Figure 7 and Figure 8 In the case of only the winding rod 8, the bare rod may slide out directly from the end under the action of centrifugal force when the waterweed is entangled, and the waterweed mass that has been entangled may directly adhere to the end surface of the screen plate 5 with the water flow, thereby affecting the collection efficiency of the sample. Therefore, an elastic rod 9 is arranged to be tilted downward along the axial direction of the winding rod 8 and is elastic, so that the waterweed can slide down but will not fall off. The elastic force of the elastic rod 9 is less than the force applied by the force-applying part of the winding rod 8, so that when the screen plate 5 moves downward, the elastic rod 9 can be bent, so that the waterweed mass can slide down; After the elastic rod 9 is set, in the initial state, the end of the movable end of the elastic rod 9 should be within the axial range of the through hole 51 to prevent the movable end of the elastic rod 9 from entering the top of the screen plate 5 and causing a reset obstacle. The protruding ring 501 is set to extend the axial direction of the through hole 51 without increasing the overall thickness and mass of the screen plate 5.

[0022] See also Figure 7 and Figure 8 The function of the elastic rod 9 is to limit the water weeds and facilitate their attachment. When cleaning the water weeds, the elastic rod 9 needs to be compressed. Therefore, the inner wall edge of the lower end of the protruding ring 501 needs to slide down to contact the elastic rod 901 and then always fit with the elastic rod 901, pressurizing it and pushing the water weeds away at the same time. Figure 7 In the cross-sectional view shown, the axis of the protruding ring 501 is coplanar with the axis of the elastic rod 9 and the axis of the winding rod 8.

[0023] See also Figure 7 , Figure 8 and Fig. 9If the elastic rod 9 is directly arranged on the outer wall of the winding rod 8, even if it is compressed and bent by the screen plate 5, it is always convex on the surface of the winding rod 8, which is not conducive to the downward movement of the water plants on the upper part of the winding rod 8. Therefore, a semi-annular groove 81 extending along the axial direction is provided on the elastic rod 9. The elastic rod 9 is compressed into the semi-annular groove 81 and will not protrude in the axial section of the winding rod beyond the maximum outer diameter line of the winding rod 8, thereby not affecting the downward movement of the water plants.

[0024] See also Figure 6 and Fig.10 , the maximum angle between the winding rod 8 and the axis of the main shaft 6 is α, the angle between the elastic rod 9 and the axis of the winding rod 8 in the natural state is β, and the outer end of the bending part 901 is tilted upward when the angle between the axis of the elastic rod 9 and the vertical direction is the maximum (α+β), because the waterweeds are in strips when entering with the water flow, most of them will not be entangled, but the waterweeds are folded in half and hung on the winding rod 8 or the elastic rod 9 to move synchronously with it, because the rotation of the winding rod 8 or the elastic rod 9 has centrifugal force, so even if there is an elastic rod 9, it is easy to detach in the state without entanglement, and after detachment, it will still contact the screen plate 5 with the water flow, so by arranging the bending part 901 on the elastic rod 9, its end is upward, and the bending part of the bending part 901 forms a downward inflection point, thereby limiting those waterweeds that have not formed entanglement, preventing them from detaching, and they can always be hung; When the angle between the elastic rod 9 and the vertical direction of the bending portion 901 is at the maximum (α+β), the angle between the bending portion 901 and the horizontal line is 0-10°, and preferably 5°. This is because as the amount of hanging aquatic plants increases, the angle α will be reduced, thereby affecting the angle between the bending portion 901 and the horizontal line. Therefore, it is set to 5° to leave a little redundancy. Similarly, when the bending portion 901 moves down to the maximum when the sieve plate 5 moves down, it must be within the internal range of the protruding ring 501 so that the aquatic plants can be brought out.

[0025] In the description of the present invention, the terms "first", "second", "another", and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0027] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A water quality testing sample extraction device, comprising a peristaltic pump (1), a peristaltic tube (2) mounted on the peristaltic pump (1), one end of the peristaltic tube (2) butting against an extension tube (3), and the other end of the extension tube (3) being detachably connected to a screen tube (4), a float (10) being movably connected to the peristaltic tube, characterized in that: The screen tube (4) is a hollow tubular body with openings at both ends. A screen plate (5) is slidably provided on the inner wall of the water inlet end of the screen tube (4) along the axial direction. A main shaft (6) colinear with the axis of the screen tube (4) is rotatably installed in the screen tube (4) through a bearing. A paddle (7) is fixedly connected to one end of the main shaft (6) away from the screen plate (5). A winding rod (8) is hingedly connected to the other end of the main shaft (6). The hinge point between the winding rod (8) and the main shaft (6) is not on the axis of the main shaft (6). The paddle (7) drives the winding rod (8) when rotating with the water flow. The winding rod (8) is unfolded under the action of centrifugation. A through hole (51) is provided at the center of the screen plate (5). The winding rod (8) passes through the through hole (51). The screen plate (5) does not separate from the winding rod (8) during its movement.

2. A water quality testing sample extraction device according to claim 1, characterized in that: The winding rods (8) are provided in at least two groups and are evenly distributed on the main shaft (6).

3. A water quality testing sample extraction device according to claim 1 or 2, characterized in that: The winding rod (8) rotates within a plane where the main shaft (6) and the hinge point of the winding rod (8) are located, and a force-applying portion for applying a force to the winding rod (8) that moves away from the axis of the main shaft (6) is also provided in the screen tube (4).

4. A water quality testing sample extraction device according to claim 3, characterized in that: A downwardly inclined elastic rod (9) is fixed to the movable end of the winding rod (8); a protruding ring (501) is integrally provided at the center of the lower end surface of the screen plate (5); the protruding ring (501) is coaxial with the through hole (51) and has a continuous inner wall; in a non-water-filled state, the elastic rod (9) is located within the region of the protruding ring (501) and the through hole (51).

5. A water quality testing sample extraction device according to claim 4, characterized in that: The axes of the elastic rod (9) and the protruding ring (501) are coplanar, and the elastic rod (9) abuts against the side wall of the protruding ring (501) and bends toward the winding rod (8) during the sliding process of the screen plate (5).

6. A water quality testing sample extraction device according to claim 5, characterized in that: The outer wall of the winding rod (8) is provided with a semi-annular groove (81) distributed along the axial direction, and the elastic rod (9) is arranged in the semi-annular groove (81). When the screen plate (5) reaches the bottom end, the elastic rod (9) is bent and completely accommodated in the semi-annular groove (81).

7. A water quality testing sample extraction device according to claim 6, characterized in that: At least one bending portion (901) is provided on the elastic rod (9), and the bending portion (901) is inclined upward when the winding rod (8) is at the maximum unfolding angle and the elastic rod (9) is in a natural state.

8. The water quality testing sample extraction device according to claim 1, characterized in that: The inner surface of the sieve holes on the sieve plate (5) is in the shape of an annular blade.

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