Water quality sampling device for heavy metal detection
By designing a water quality sampling device that automatically adjusts the liquid aspiration volume using a transmission wheel and torsion spring system, the problems of deteriorated elasticity of the pipette spring system and forgetting to reset were solved, thus realizing automatic reset and precise control of the pipette.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-17
- Publication Date
- 2026-03-24
AI Technical Summary
After prolonged use, the spring system of existing pipettes loses elasticity, leading to errors in liquid volume control. Furthermore, operators may forget to adjust the liquid volume back to the maximum, affecting the accuracy of subsequent testing.
A water quality sampling device for heavy metal detection was designed. The device automatically adjusts the liquid aspiration volume through a transmission wheel and torsion spring system. Combined with a limiting structure and a timed reset mechanism, it ensures that the pipette automatically returns to the maximum liquid aspiration volume after use.
It effectively protects the pipette's spring system, avoids errors in liquid aspiration, improves the convenience and accuracy of operation, and ensures that the pipette automatically resets after each use.
Smart Images
Figure CN121721233A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of sample injection technology, in particular to a water quality injection device for heavy metal detection. BACKGROUND
[0002] Water is one of the most important resources for the survival of plants and animals, so people pay more and more attention to the recycling and protection of water resources. Due to industrial activities, agricultural pollution, natural geology, and municipal and domestic pollution, the heavy metals in water may exceed the standard. Heavy metals have persistence, bioaccumulation and toxicity, and once they enter the water, they will have a long-term impact on human health and the ecosystem. Therefore, it is often necessary to detect heavy metals in some commonly used water sources. When detecting heavy metals in water, a water quality heavy metal detector is generally used. This device is a special instrument for detecting the heavy metal content of water. Due to the characteristics of water, when the water sample is sent to the detection area of the water quality heavy metal detector, a special sampling device is generally used for sampling work to avoid water droplets falling on the water quality heavy metal detector. The common water sampling device is a pipette, which is a tool for accurately transferring liquid. It is widely used in water quality detection laboratories. Its core principle is to rely on the cooperation of the internal spring system and the piston rod. The spring system follows Hooke's law, and the piston moves by controlling the extension and contraction of the spring to accurately control the volume of the liquid. When using the pipette, the spring will contract when controlling the amount of water sample. The elasticity of the spring will deteriorate when it is contracted for a long time, which will cause some errors in subsequent water sample quantification. Therefore, after the pipette is used, the liquid suction amount of the pipette needs to be manually adjusted to the maximum. However, due to the long detection time, the operator often forgets to adjust the liquid suction amount of the pipette to the maximum after completing the water quality detection work, which will affect the normal elasticity of the spring due to the long-term contraction of the spring. Therefore, we propose a water quality sampling device for heavy metal detection. SUMMARY
[0003] The present application relates to the field of sample injection technology, in particular to a water quality injection device for heavy metal detection.
[0004] In order to achieve the above object, the present application provides the following technical scheme: a water quality sampling device for heavy metal detection, comprising a shell, an installation cavity A and an installation cavity B are respectively formed in the shell, a partition plate is fixedly connected in the installation cavity A, a butt joint pipe communicating with the installation cavity A is fixedly connected to the bottom of the shell, an installation rod is slidably connected through the partition plate, a screw rod is fixedly connected to the bottom of the installation rod, an installation seat is fixedly connected to the bottom of the screw rod, a piston rod is fixedly connected to the bottom of the installation seat, the bottom end of the piston rod is located in the butt joint pipe and is slidably connected thereto, and a transmission wheel is fixedly connected to one end of the screw rod close to the installation seat; A mounting bracket is fixedly connected to the inner wall of the side of the installation cavity A away from the installation cavity B, a transmission roller is rotatably connected in the mounting bracket, the transmission roller and the transmission wheel are in contact with each other, rough particles are arranged on the surfaces of the transmission roller and the transmission wheel, torsional springs are arranged at the two ends of the transmission roller and the butt joint of the mounting bracket, a limiting disc is rotatably connected to the bottom of the mounting bracket, the top of the limiting disc is fixedly connected to the bottom end of the transmission roller, and a plurality of evenly distributed clamping grooves are formed in the bottom of the limiting disc. A fixing plate is fixedly connected to the inner wall of the side of the installation cavity A away from the installation cavity B, two limiting springs are fixedly connected to the top of the fixing plate, a bearing plate is fixedly connected between the tops of the two limiting springs, and a clamping plate is fixedly connected to the side of the bearing plate close to the limiting disc.
[0005] Preferably, a limiting tube is fixedly connected to the inner wall of the side of the installation cavity A away from the installation cavity B, the limiting tube is located above the bearing plate, a counterweight is slidably connected in the limiting tube, a damping pad is arranged between the counterweight and the inner wall of the limiting tube, a fixing bracket is fixedly connected to the outer wall of the side of the shell away from the installation cavity B, a pulley is rotatably connected to the fixing bracket, a receiving groove is formed in the pulley, a traction rope is wound in the receiving groove, and one end of the traction rope away from the pulley penetrates through the outer wall of the shell and is fixedly connected to the top of the counterweight.
[0006] Preferably, the fixing plate is located below the mounting bracket, the clamping plate is located in the clamping groove corresponding to the limiting disc, and a telescopic rod is arranged in each of the limiting springs.
[0007] Preferably, a sliding groove is formed in the bottom of each side of the butt joint pipe, a sleeve pipe is sleeved on the butt joint pipe, and a suction tube is sleeved on the bottom end of the butt joint pipe.
[0008] Preferably, a limiting bracket is fixedly connected to the outer wall of the side of the shell close to the pulley, a connecting rod is slidably connected in the limiting bracket, a limiting clamp is fixedly connected to the top end of the connecting rod, the limiting clamp is located below the pulley, a limiting ring is fixedly connected to the bottom end of the limiting clamp, and the limiting ring is sleeved on the butt joint pipe and is slidably connected with the sliding groove.
[0009] Preferably, the installation cavity B is slidably connected with a button B, the bottom of the button B is fixedly connected with a transmission rod, the bottom of the button B and the inner bottom wall of the installation cavity B are fixedly connected with a return spring C, the return spring C is sleeved outside the transmission rod, the bottom end of the transmission rod penetrates through the bottom of the shell and is fixedly connected with a connecting frame, and the end, away from the transmission rod, of the connecting frame is fixedly connected with the sleeve.
[0010] Preferably, the installation rod is sleeved with a limiting sleeve, the limiting sleeve and the partition plate are fixedly connected with a return spring B, the top of the installation rod is fixedly connected with a limiting seat, and the top of the limiting seat is fixedly connected with a button A.
[0011] Preferably, the installation seat and the inner bottom wall of the installation cavity A are fixedly connected with a return spring A, the return spring A is sleeved outside the piston rod, the installation cavity A is slidably connected with a movable plate, and the screw rod penetrates through the movable plate and is threadedly connected therewith.
[0012] Preferably, one side of the pulley is provided with a plurality of uniformly distributed scale grooves, the fixed frame is provided with an indicating arrow on the side close to the scale grooves, the shell is rotatably connected with a cover on the outer wall of the side close to the fixed frame, the cover is sleeved outside the fixed frame and the pulley, and the side, away from the shell, of the cover is provided with a notch.
[0013] Preferably, the shell is provided with a digital display module inside, the digital display module is sleeved outside the installation seat and the piston rod, and the shell is provided with an observation window on the side close to the digital display module.
[0014] Compared with the prior art, the present application has the following advantages: 1、the present application by rotating the button A, drive screw rotation, with the movable plate cooperation, make screw in the process of rotation, along the movable plate down, in this way adjust the position of the piston rod, and control the liquid suction volume, and in this process, the screw rod uses transmission wheel drive transmission roller rotation, make torsional spring tight, when not use the device, torsional spring rebound, drive transmission roller back, at this moment transmission roller through with transmission wheel cooperation, drive screw reverse rotation, until the screw rod lift to the initial position, ensure the liquid suction volume of the pipette back to the maximum, avoid because staff after using the pipette, forget to adjust the liquid suction volume of the pipette back to the maximum, lead to its internal spring system damage problem, effectively improve the protection of the spring system in the device. 2、The utility model discloses a structure is simple, and the use is convenient, and the liquid suction amount of the pipette gun can be adjusted, and the time when the pipette gun resets to the maximum liquid suction amount can be defined, and the time of resetting is timed, and the auxiliary nature of the device for the operator when using the device is improved. 3、The utility model discloses a structure, when the water quality sample sending work is finished, the suction tube is taken off from the butt joint pipe, the limiting ring is down along the butt joint pipe due to the influence of gravity factor, the limiting ring will drive the limiting clamp to go down together with the connecting rod, makes the limiting clamp and the pulley separate, and the limiting work of pulley is released, through the structure, can ensure that when the sample sending device is in the locking state, will not reset and the timing work of resetting, when the suction tube is taken down, it represents that the pipette gun is used up, at this time, the locking state of the reset structure is automatically released, makes the timing reset structure, and carries out timing, and when the time reaches, completes the readjustment work of the liquid suction amount of pipette gun. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is the whole structure schematic diagram of the utility model; Figure 2 It is the shell section structure schematic diagram of the utility model; Figure 3 It is the transmission wheel and transmission roller transmission structure schematic diagram of the utility model; Figure 4 It is the mounting bracket section structure schematic diagram of the utility model; Figure 5The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 6 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 7 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 8 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 9 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 10 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 2 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 11 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 4 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 12 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure. Figure 8 The schematic diagram of the section structure of the limiting pipe of the application is shown in the figure.
[0016] In the figure: 1, outer shell; 11, installation cavity A; 12, installation cavity B; 13, partition plate; 14, digital display module; 15, observation window; 2, docking pipe; 21, sliding groove; 22, sleeve pipe; 23, liquid suction pipe; 3, installation rod; 31, screw rod; 32, installation seat; 33, piston rod; 34, reset spring A; 35, movable plate; 36, transmission wheel; 4, limiting sleeve; 41, reset spring B; 42, limiting seat; 43, button A; 5, button B; 51, transmission rod; 52, reset spring C; 53, connecting frame; 6, installation frame; 61, transmission roller; 62, torsion spring; 63, limiting disc; 64, clamping groove; 7, fixed plate; 71, limiting spring; 72, bearing plate; 73, clamping plate; 74, telescopic rod; 8, limiting pipe; 81, counterweight block; 82, fixed frame; 83, pulley; 84, storage groove; 85, traction rope; 86, scale groove; 87, indicating arrow; 88, cover; 9, limiting frame; 91, connecting rod; 92, limiting clamp; 93, limiting ring. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.
[0018] Please refer to Figures 1-12The application provides a technical scheme: a water quality sampling device for heavy metal detection, which comprises a shell 1, installation cavities A11 and B12 are respectively arranged in the shell 1, a partition plate 13 is fixedly connected in the installation cavity A11, a butt joint pipe 2 which is in communication with the installation cavity A11 is fixedly connected to the bottom of the shell 1, an installation rod 3 is slidably connected through the partition plate 13, a screw rod 31 is fixedly connected to the bottom of the installation rod 3, an installation base 32 is fixedly connected to the bottom of the screw rod 31, a piston rod 33 is fixedly connected to the bottom of the installation base 32, the bottom end of the piston rod 33 is located in the butt joint pipe 2 and is slidably connected with the butt joint pipe 2, a digital display module 14 is arranged in the shell 1, the digital display module 14 is a mechanical digital display module, adopts a decimal calculation method, a counting unit is formed by a plurality of gear levels such as a planetary gear, each gear represents a decimal number 0-9, a low gear represents a single digit from 9 to 0 after rotating one round, a high gear is driven to rotate one pitch by a ratchet or balance wheel mechanism, the decimal carry logic is realized, the digital display module 14 is sleeved outside the installation base 32 and the piston rod 33, an observation window 15 is arranged on one side of the shell 1 close to the digital display module 14, a suction tube 23 is sleeved at the bottom end of the butt joint pipe 2, a limiting sleeve 4 is sleeved outside the installation rod 3, a reset spring B41 is fixedly connected between the limiting sleeve 4 and the partition plate 13, a limiting seat 42 is fixedly connected to the top of the installation rod 3, a button A43 is fixedly connected to the top of the limiting seat 42, a reset spring A34 is fixedly connected between the installation base 32 and the bottom wall in the installation cavity A11, the reset spring A34 is sleeved outside the piston rod 33, a movable plate 35 is slidably connected in the installation cavity A11, and the screw rod 31 penetrates through the movable plate 35 and is threadedly connected with the movable plate 35.
[0019] Further, in the heavy metal detection of water quality, first, the water quality sample is prepared, then according to the specific required water sample, rotate the button A43, at this time the button A43 drives the screw rod 31 to rotate, and uses the movable plate 35 to make the screw rod 31 descend along the movable plate 35 in the rotating process, at this time the screw rod 31 will drive the mounting seat 32 to descend, and drive the piston rod 33 to descend along the butt joint pipe 2, and make the reset spring A34 contract, so as to change the maximum stroke of the piston rod 33, so as to change the size of the liquid suction amount, and in the process of rotating the screw rod 31, it will drive the digital display module 14 to rotate through the mounting seat 32, and use the digital display module 14 to display the current liquid suction amount of the pipette, the worker can observe the number on the digital display module 14 through the observation window 15, after adjusting the liquid suction amount of the pipette, press the button A43, at this time the button A43 drives the limiting seat 42, the screw rod 31, the movable plate 35, the mounting seat 32 and the piston rod 33 to descend, and makes the reset spring A34 contract, at this time the piston rod 33 will exhaust the air in the butt joint pipe 2, then the suction tube 23 is sleeved on the butt joint pipe 2, then the suction tube 23 is immersed in the water sample, then the button A43 is released, at this time the reset spring A34 begins to rebound, drives the piston rod 33 and the screw rod 31 and other components to lift up, at this time the piston rod 33 will use the suction tube 23 to suck the water sample into the suction tube 23, that is, the quantitative liquid suction work is completed, then the suction tube 23 is aligned with the detection area of the water quality heavy metal detector, and the button A43 is pressed again, in the operation process, the button A43 drives the limiting seat 42, the screw rod 31, the movable plate 35, the mounting seat 32 and the piston rod 33 to descend, and uses the piston rod 33 to exhaust the liquid in the butt joint pipe 2 into the detection area of the water quality heavy metal detector, and continues to press the button A43, at this time the bottom of the limiting seat 42 will press on the inner bottom wall of the limiting sleeve 4, so as to drive the limiting sleeve 4 to descend, and make the reset spring B41 contract, this operation will increase the descending stroke of the piston rod 33, to ensure that the liquid in the butt joint pipe 2 can be completely exhausted, then release the button A43, the piston rod 33 and other components complete reset under the rebound force of the reset spring A34 and the reset spring B41.
[0020] Combining the drawings Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 10 , Figure 11As shown, the end of the screw rod 31 close to the mounting base 32 is sleeved with a fixedly connected transmission wheel 36, the inner wall of the side of the installation cavity A11 away from the installation cavity B12 is fixedly connected with a mounting frame 6, the mounting frame 6 is rotatably connected with a transmission roller 61, the transmission roller 61 and the transmission wheel 36 are in contact with each other, the surfaces of the transmission roller 61 and the transmission wheel 36 are provided with rough particles, the two ends of the transmission roller 61 are provided with torsional springs 62 at the docking positions with the mounting frame 6, the bottom of the mounting frame 6 is rotatably connected with a limiting disc 63, the top of the limiting disc 63 is fixedly connected with the bottom end of the transmission roller 61, the bottom of the limiting disc 63 is provided with a plurality of evenly distributed clamping grooves 64, the inner wall of the side of the installation cavity A11 away from the installation cavity B12 is fixedly connected with a fixed plate 7, the fixed plate 7 is located below the mounting frame 6, the top of the fixed plate 7 is fixedly connected with two limiting springs 71, the top of the two limiting springs 71 is fixedly connected with a bearing plate 72, the side of the top of the bearing plate 72 close to the limiting disc 63 is fixedly connected with a clamping plate 73, the clamping plate 73 is located in the clamping groove 64 corresponding to the limiting disc 63, the inner wall sides of the clamping groove 64 and the top sides of the clamping plate 73 are provided with inclined surfaces, the limiting springs 71 are all provided with telescopic rods 74, the top and bottom of the telescopic rod 74 are fixedly connected with the bearing plate 72 and the fixed plate 7 respectively, the inner wall of the side of the installation cavity A11 away from the installation cavity B12 is fixedly connected with a limiting tube 8, the limiting tube 8 is located above the bearing plate 72, the limiting tube 8 is slidably connected with a counterweight 81, the counterweight 81 and the inner wall of the limiting tube 8 are provided with damping pads, the outer wall of the side of the shell 1 away from the installation cavity B12 is fixedly connected with a fixed frame 82, the fixed frame 82 is rotatably connected with a pulley 83, the pulley 83 is provided with a receiving groove 84, the receiving groove 84 is wound with a traction rope 85, one end of the traction rope 85 away from the pulley 83 penetrates through the outer wall of the shell 1 and is fixedly connected with the top of the counterweight 81, one side of the pulley 83 is provided with a plurality of evenly distributed scale grooves 86, the side of the fixed frame 82 close to the scale grooves 86 is provided with an indicating arrow 87, the outer wall of the side of the shell 1 close to the fixed frame 82 is rotatably connected with a cover 88, the cover 88 is sleeved outside the fixed frame 82 and the pulley 83, after adjusting the rotation turns of the pulley 83, the cover 88 is closed, the fixed frame 82 and the pulley 83 are covered by the cover 88, avoiding the problem of accidentally touching the pulley 83 when the staff uses the device, the bottoms of the two sides of the connecting pipe 2 are provided with sliding grooves 21, the connecting pipe 2 is sleeved with a sleeve pipe 22, the bottom end of the connecting pipe 2 exceeds the bottom end of the sleeve pipe 22 by a certain distance, and the sliding groove 21 part of the connecting pipe 2 is located outside the sleeve pipe 22, the outer wall of the side of the shell 1 close to the pulley 83 is fixedly connected with a limiting frame 9, the limiting frame 9 is slidably connected with a connecting rod 91, the top end of the connecting rod 91 is fixedly connected with a limiting clamp 92, the limiting clamp 92 is located below the pulley 83, the bottom end of the limiting clamp 92 is fixedly connected with a limiting ring 93, the limiting ring 93 is sleeved on the connecting pipe 2 and is slidably connected with the sliding groove 21, the side of the cover 88 away from the shell 1 is provided with a notch,The cover 88 is provided with a notch to provide sufficient space for the limiting clip 92 to move when the cover 88 covers the fixing frame 82 and the pulley 83.
[0021] Further, before using the pipette, according to specific needs, rotate the pulley 83, at this time, the pulley 83 rotates, and the traction rope 85 can be wound, so that the counterweight 81 rises along the limiting tube 8, at this time, the distance between the counterweight 81 and the bearing plate 72 is far away, at this time, according to the cooperation between the scale groove 86 of the pulley 83 and the indicating arrow 87 of the fixed frame 82, the staff can more intuitively know how much time the current counterweight 81 needs to slide down the limiting tube 8 and fall on the bearing plate 72, after rotating the pulley 83, close the cover 88 to avoid the subsequent operator from touching the pulley 83 by mistake, then rotate the button A43, when adjusting the liquid suction amount of the pipette, the screw rod 31 rotates in the process, which can drive the transmission roller 61 to rotate by using the transmission wheel 36, at this time, the transmission roller 61 drives the torsional spring 62 to wind, and because the force of the hand rotating the button A43 is large, and the inner wall of the clamping groove 64 and the top of the clamping plate 73 are provided with inclined surfaces, at this time, the clamping groove 64 in the limiting disc 63 rotates with the transmission roller 61, the direction of the force of the clamping groove 64 wall extruding the clamping plate 73 changes, so that the fixed plate 7 descends and the limiting spring 71 is contracted, and the number of the clamping groove 64 at the bottom of the limiting disc 63 corresponds to the unit digit of the digital display module 14, so when the adjacent next clamping groove 64 clamps on the clamping plate 73, the unit digit of the digital display module 14 changes, when the adjustment is completed, because there is no external force, the limiting spring 71 begins to rebound, and drives the fixed plate 7 to lift, so that the clamping plate 73 clamps in the corresponding clamping groove 64, thereby limiting the limiting disc 63, preventing the transmission roller 61 from rotating by itself, when using the device, when the suction tube 23 is inserted into the connecting pipe 2, the suction tube 23 extrudes the limiting ring 93, so that the limiting ring 93 rises along the connecting pipe 2, at this time, the limiting ring 93 drives the limiting clamp 92 to lift together by using the connecting rod 91, and makes the limiting clamp 92 clamp on the pulley 83, so as to limit the pulley 83, after the water quality sample delivery work is completed, the suction tube 23 is taken off from the connecting pipe 2, at this time, the limiting ring 93 descends along the connecting pipe 2 due to the influence of gravity, at this time, the limiting ring 93 drives the limiting clamp 92 to descend together by using the connecting rod 91, so that the limiting clamp 92 is separated from the pulley 83, and the limiting work of the pulley 83 is released, at this time, the counterweight 81 descends along the limiting tube 8 due to the influence of gravity, and drives the pulley 83 to rotate by using the traction rope 85, according to the number of turns of the traction rope 85 wound by the pulley 83, the counterweight 81 falls on the bearing plate 72 after a certain time, at this time, the counterweight 81 extrudes the bearing plate 72, so that it descends, and the clamping plate 73 moves out of the clamping groove 64, at this time, the limiting effect of the limiting disc 63 disappears, the torsional spring 62 rebounds, and drives the transmission roller 61 to rotate back, in the process of rotating back, the transmission roller 61 drives the screw rod 31 to rotate back by using the transmission wheel 36, so that the screw rod 31 rises along the movable plate 35 in the process of rotating, and drives the piston rod 33 to lift, until it is lifted to the maximum extent,So that the pipette can complete the automatic reset work.
[0022] The button B5 is slidably connected in the installation cavity B12. Figure 1 And Figure 2 As shown, the bottom of the button B5 is fixedly connected with the transmission rod 51, the bottom of the button B5 and the inner bottom wall of the installation cavity B12 are fixedly connected with the reset spring C52, the reset spring C52 is sleeved on the transmission rod 51, the bottom end of the transmission rod 51 penetrates through the bottom of the shell 1 and is fixedly connected with the connecting frame 53, and the end away from the transmission rod 51 of the connecting frame 53 is fixedly connected with the sleeve 22.
[0023] Further, when the sampling work is completed, the button B5 is pressed, at this time the button B5 drives the transmission rod 51 to descend, and the reset spring C52 is contracted, at this time the transmission rod 51 drives the connecting frame 53 to descend, the sleeve 22 moves along the bottom end of the butt joint pipe 2, and the pipette 23 sleeved on the butt joint pipe 2 is squeezed off, so that the dismounting work of the pipette 23 is completed, then the button B5 is released, at this time the reset spring C52 begins to rebound, drives the button B5, the transmission rod 51, the connecting frame 53 and the sleeve 22 to return to the initial position.
[0024] Working principle: when the water quality is detected, first the water quality sample is prepared, then according to the amount of the water sample required, the button A43 is rotated, at this time the button A43 drives the screw rod 31 to rotate, and the movable plate 35 is used to make the screw rod 31 descend along the movable plate 35 in the rotating process, at this time the screw rod 31 drives the mounting seat 32 to descend, drives the piston rod 33 to descend along the butt joint pipe 2, and makes the reset spring A34 contract, so as to change the maximum stroke of the piston rod 33, so as to change the size of the liquid suction amount, and in the rotating process of the screw rod 31, the digital display module 14 is driven to rotate through the mounting seat 32, the current liquid suction amount of the pipette is displayed by using the digital display module 14, and the worker can observe the number on the digital display module 14 through the observation window 15; After that, according to the specific needs, rotate the pulley 83, at this time the pulley 83 rotates, the traction rope 85 can be wound, so that the counterweight 81 rises along the limiting tube 8, at this time the distance between the counterweight 81 and the bearing plate 72 is far away, at this time according to the scale groove 86 of the pulley 83 and the indicating arrow 87 of the fixed frame 82, the staff can know how much time the current counterweight 81 height needs to slide down on the bearing plate 72 along the limiting tube 8, after rotating the pulley 83, close the cover 88, to avoid subsequent operators misoperation pulley 83, then rotate the button A43, adjust the liquid suction amount of the pipette, the screw rod 31 rotates in the process, the transmission wheel 36 drives the transmission roller 61 to rotate, at this time the transmission roller 61 drives the torsional spring 62 to wind, and because the force of manually rotating the button A43 is large, and the inner wall of the clamping groove 64 and the top of the clamping plate 73 are provided with inclined surfaces, at this time the clamping groove 64 in the process of following the transmission roller 61 rotates, the direction of the force of the clamping groove 64 wall extruding the clamping plate 73 changes, so that the fixed plate 7 descends and the limiting spring 71 is contracted, and the number of the clamping groove 64 at the bottom of the limiting disc 63 corresponds to the unit digit of the digital display module 14, so when the adjacent next clamping groove 64 clamps on the clamping plate 73, the unit digit of the digital display module 14 changes, when the adjustment is completed, at this time there is no external force, so the limiting spring 71 begins to rebound, and drives the fixed plate 7 to lift, so that the clamping plate 73 clamps in the corresponding clamping groove 64, so as to limit the limiting disc 63, prevent the transmission roller 61 from rotating by itself, and when using the device, when the suction tube 23 is inserted into the butt joint pipe 2, the limiting ring 93 is extruded by the suction tube 23, the limiting ring 93 rises along the butt joint pipe 2, at this time the limiting ring 93 drives the limiting clamp 92 to lift together through the connecting rod 91, and the limiting clamp 92 clamps on the pulley 83, so as to limit the pulley 83; After the preparation is completed, press the button A43, at this time the button A43 drives the limiting seat 42, the screw rod 31, the movable plate 35, the mounting seat 32 and the piston rod 33 to descend, and makes the return spring A34 contract, at this time the piston rod 33 will discharge the air in the docking pipe 2, then the suction tube 23 is sleeved on the docking pipe 2, then the suction tube 23 is immersed in the water sample, then the button A43 is released, at this time the return spring A34 begins to rebound, drives the piston rod 33 and the screw rod 31 and other components to lift, at this time the piston rod 33 will use the suction tube 23 to suck the water sample into the suction tube 23 during the lifting process, that is, the quantitative liquid suction work is completed, then the suction tube 23 is aligned with the detection area of the water quality heavy metal detector, and the button A43 is pressed again, in the operation process, the button A43 drives the limiting seat 42, the screw rod 31, the movable plate 35, the mounting seat 32 and the piston rod 33 to descend, uses the piston rod 33 to discharge the liquid in the docking pipe 2, and enters the detection area of the water quality heavy metal detector, and continues to press the button A43, at this time the bottom of the limiting seat 42 will press on the inner bottom wall of the limiting sleeve 4, thereby driving the limiting sleeve 4 to descend, and making the return spring B41 contract, this operation will increase the descending stroke of the piston rod 33, and ensure that the liquid in the docking pipe 2 can be completely discharged, then the button A43 is released, and the piston rod 33 and other components are reset under the rebounding force of the return spring A34 and the return spring B41; Then press the button B5, at this time the button B5 drives the transmission rod 51 to descend, and makes the return spring C52 contract, at this time the transmission rod 51 drives the connecting frame 53 to descend by driving the sleeve 22 to move along the bottom end of the docking pipe 2, and the suction tube 23 sleeved on the docking pipe 2 is squeezed off, thereby completing the disassembly work of the suction tube 23, then the button B5 is released, at this time the return spring C52 begins to rebound, drives the button B5, the transmission rod 51, the connecting frame 53 and the sleeve 22 to return to the initial position; At this time, due to the removal of the suction tube 23, the limiting effect of the limiting ring 93 disappears, and the limiting ring 93 descends along the butt joint pipe 2 due to the influence of gravity. At this time, the limiting ring 93 will drive the limiting clamp 92 to descend together through the connecting rod 91, so that the limiting clamp 92 is separated from the pulley 83, and the limiting work of the pulley 83 is released. At this time, the counterweight 81 will descend along the limiting pipe 8 due to the influence of gravity, and drive the pulley 83 to rotate through the traction rope 85. According to the number of turns of the pulley 83 on the traction rope 85, the counterweight 81 will fall on the bearing plate 72 after a certain period of time. At this time, the counterweight 81 extrudes the bearing plate 72, so that it descends, and the clamping plate 73 moves out of the clamping groove 64. At this time, the limiting effect of the limiting disc 63 disappears, and the torsional spring 62 can rebound and drive the transmission roller 61 to rotate. During the rotation of the transmission roller 61, the screw rod 31 can be driven to rotate through the cooperation with the transmission wheel 36, so that it is lifted along the movable plate 35 during the rotation, and drives the piston rod 33 to lift, until it is lifted to the maximum extent. At this time, the automatic reset work of the pipette is completed.
[0025] It should be noted that the relational terms herein 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 such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations 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 can include other elements not expressly listed or inherent to such process, method, article, or apparatus.
[0026] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A water quality sampling device for heavy metal detection, comprising a housing (1), wherein an installation cavity A (11) and an installation cavity B (12) are respectively provided in the housing (1), a partition plate (13) is fixedly connected in the installation cavity A (11), a connecting pipe (2) communicating with the installation cavity A (11) is fixedly connected to the bottom of the housing (1), an installation rod (3) is slidably connected through the partition plate (13), a screw (31) is fixedly connected to the bottom of the installation rod (3), an installation seat (32) is fixedly connected to the bottom of the screw (31), a piston rod (33) is fixedly connected to the bottom of the installation seat (32), and the bottom end of the piston rod (33) is located in the connecting pipe (2) and slidably connected thereto, characterized in that: The screw (31) is fitted with a fixedly connected transmission wheel (36) at one end near the mounting base (32); A mounting frame (6) is fixedly connected to the inner wall of the mounting cavity A (11) away from the mounting cavity B (12). A transmission roller (61) is rotatably connected inside the mounting frame (6). The transmission roller (61) and the transmission wheel (36) are in contact with each other. The surfaces of the transmission roller (61) and the transmission wheel (36) are both provided with rough particles. Torsion springs (62) are provided at both ends of the transmission roller (61) and the mounting frame (6). A limiting plate (63) is rotatably connected to the bottom of the mounting frame (6). The top of the limiting plate (63) is fixedly connected to the bottom end of the transmission roller (61). Several evenly distributed slots (64) are opened at the bottom of the limiting plate (63). A fixing plate (7) is fixedly connected to the inner wall of the mounting cavity A (11) away from the mounting cavity B (12). Two limiting springs (71) are fixedly connected to the top of the fixing plate (7). A load-bearing plate (72) is fixedly connected between the tops of the two limiting springs (71). A clamping plate (73) is fixedly connected to the top of the load-bearing plate (72) near the limiting plate (63).
2. The water quality sampling device for heavy metal detection according to claim 1, characterized in that: A limiting tube (8) is fixedly connected to the inner wall of the mounting cavity A (11) away from the mounting cavity B (12). The limiting tube (8) is located above the load-bearing plate (72). A counterweight (81) is slidably connected inside the limiting tube (8). A damping pad is provided between the counterweight (81) and the inner wall of the limiting tube (8). A fixing frame (82) is fixedly connected to the outer wall of the outer shell (1) away from the mounting cavity B (12). A pulley (83) is rotatably connected to the fixing frame (82). A storage groove (84) is opened on the pulley (83). A traction rope (85) is wound in the storage groove (84). One end of the traction rope (85) away from the pulley (83) passes through the outer wall of the outer shell (1) and is fixedly connected to the top of the counterweight (81).
3. The water quality sampling device for heavy metal detection according to claim 1, characterized in that: The fixing plate (7) is located below the mounting bracket (6), the card plate (73) is located in the slot (64) corresponding to the position of the limiting plate (63), and the limiting spring (71) is provided with a telescopic rod (74). The top and bottom of the telescopic rod (74) are fixedly connected to the load-bearing plate (72) and the fixing plate (7) respectively.
4. The water quality sampling device for heavy metal detection according to claim 1, characterized in that: The bottom of both sides of the connecting pipe (2) is provided with a sliding groove (21), the connecting pipe (2) is covered with a sleeve (22), and the bottom end of the connecting pipe (2) is covered with a suction tube (23).
5. The water quality sampling device for heavy metal detection according to claim 2, characterized in that: A limiting frame (9) is fixedly connected to the outer wall of the outer shell (1) near the pulley (83). A connecting rod (91) is slidably connected inside the limiting frame (9). A limiting clamp (92) is fixedly connected to the top of the connecting rod (91). The limiting clamp (92) is located below the pulley (83). A limiting ring (93) is fixedly connected to the bottom of the limiting clamp (92). The limiting ring (93) is sleeved on the connecting pipe (2) and slidably connected to the slide groove (21).
6. The water quality sampling device for heavy metal detection according to claim 4, characterized in that: A button B (5) is slidably connected inside the mounting cavity B (12). A transmission rod (51) is fixedly connected to the bottom of the button B (5). A return spring C (52) is fixedly connected between the bottom of the button B (5) and the inner bottom wall of the mounting cavity B (12). The return spring C (52) is sleeved outside the transmission rod (51). The bottom end of the transmission rod (51) penetrates the bottom of the outer shell (1) and is fixedly connected to a connecting frame (53). The end of the connecting frame (53) away from the transmission rod (51) is fixedly connected to the sleeve (22).
7. The water quality sampling device for heavy metal detection according to claim 1, characterized in that: The mounting rod (3) is covered with a limiting sleeve (4), and a return spring B (41) is fixedly connected between the limiting sleeve (4) and the partition (13). A limiting seat (42) is fixedly connected to the top of the mounting rod (3), and a button A (43) is fixedly connected to the top of the limiting seat (42).
8. The water quality sampling device for heavy metal detection according to claim 1, characterized in that: A return spring A (34) is fixedly connected between the mounting base (32) and the bottom wall of the mounting cavity A (11). The return spring A (34) is sleeved on the outside of the piston rod (33). A movable plate (35) is slidably connected inside the mounting cavity A (11). The screw (31) passes through the movable plate (35) and is threadedly connected to it.
9. A water quality sampling device for heavy metal detection according to claim 2, characterized in that: The pulley (83) has several evenly distributed scale grooves (86) on one side. The fixed frame (82) has an indicator arrow (87) on the side near the scale grooves (86). The outer wall of the outer shell (1) near the fixed frame (82) is rotatably connected to a cover (88). The cover (88) is sleeved on the fixed frame (82) and the pulley (83). The cover (88) has a notch on the side away from the outer shell (1).
10. A water quality sampling device for heavy metal detection according to claim 1, characterized in that: The housing (1) is provided with a digital display module (14), which is sleeved on the mounting base (32) and piston rod (33). The housing (1) is provided with an observation window (15) on the side of the housing (1) near the digital display module (14).