An automatic sampling device for chemical testing

Abstract

This invention provides an automatic sampling device for chemical testing, belonging to the field of chemical testing technology. The automatic sampling device includes a placement rod frame, a top frame, a bracket structure, a sampling cylinder assembly, a sealing strip, a bottom-contact opening and closing unit, and a pull-out rod frame assembly. The placement rod frame is equipped with a cross-type height adjustment component, which can adjust the spacing between multiple bracket structures. The sampling cylinder assembly is mounted on the bracket structure, and its sampling head is sealed by the sealing strip. When the device is lowered into the chemical pool, the height adjustment drive adjusts the depth distribution of the sampling cylinders to achieve equidistant sampling. Upon bottom contact, the bottom-contact opening and closing unit pushes the sealing strip away from the sampling head, opening the liquid inlet. The sampling cylinder pulls the piston to pull out the rod frame, causing the piston to actuate and extract the sample. This device can automatically seal and open / close, avoiding sample contamination, improving the accuracy and efficiency of multi-layer sampling, and is suitable for automated stratified sampling of liquids in chemical pools.

Description

Technical Field

[0001] This invention relates to the field of chemical testing technology, and in particular to an automatic sampling device for chemical testing. Background Technology

[0002] Chemical testing is a crucial process for ensuring that chemical products meet quality, safety, and performance requirements. It involves the inspection, testing, and analysis of chemical raw materials, intermediate products, and final products to obtain information about their composition, properties, structure, and performance. The purpose of chemical testing is not only to ensure product quality but also to improve production efficiency, reduce costs, and optimize resource allocation.

[0003] In chemical production processes, regular testing of liquids in chemical containers such as reaction tanks and storage tanks is crucial for ensuring product quality and process stability. Conventional chemical liquid testing typically requires sampling from different liquid depths to analyze concentration, component distribution, or the presence of stratification or unevenness in the reaction. Currently, common sampling methods include manual single-point sampler sampling layer by layer, or collection using simple multi-tube sampling devices. However, manual sampling is inefficient, inconsistent, and struggles to guarantee consistent sampling depth across multiple samples. Furthermore, existing sampling equipment often has a simple structure and cannot effectively seal the sampling head during descent, leading to liquid seepage before reaching the target depth, contaminating the sample and affecting testing accuracy. In addition, traditional devices cannot flexibly adapt to different tank depths, resulting in uneven sampling point distribution, especially in deep tanks or multi-layer sampling, where operation is cumbersome and reliability is low. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic sampling device for chemical testing, so as to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An automatic sampling device for chemical testing includes a sampling cylinder assembly, a placement rod frame, a top frame, a sealing strip, a bottom-contact opening and closing unit, and a pull-out rod frame assembly. Two placement rod frames are arranged opposite each other, with their tops connected to the top frame. Multiple vertically spaced bracket structures are arranged between the two placement rod frames. The lowest bracket structure is fixedly connected to the bottom of the placement rod frame, while the sides of the remaining bracket structures are vertically slidably connected to the placement rod frame. Each placement rod frame has a cross-type height adjustment component on its side, formed by an array of multiple movable cross rods along the length of the placement rod frame, with the fulcrums of adjacent movable cross rods movably connected. Each bracket structure corresponds to one of the movable cross rods and is connected to its intersection point. A height adjustment drive is provided on the top frame and is connected to the intersection point of the highest movable cross rod. Multiple sampling cylinder assemblies are correspondingly installed on... In terms of the bracket structure, the sampling cylinder assembly includes a sampling cylinder, a sampling head, and a piston unit. The sampling cylinder is connected to the bracket structure, and the sampling head is located at one end of the sampling cylinder and is used to draw sample liquid. The piston unit is located inside the sampling cylinder and extends to the other end of the sampling cylinder assembly. The sealing strip and the pull rod frame assembly are located on both sides of the placement rod frame. The top of the sealing strip and the top frame can slide together along the axial direction of the placement rod frame. The liquid inlet of the sampling head abuts against the sealing strip. The bottom-contact opening and closing unit is located at the bottom of the placement rod frame and is connected to the bottom end of the sealing strip. When the bottom-contact opening and closing unit is subjected to an upward pushing force, it can drive the sealing strip away from the placement rod frame. The top of the pull rod frame assembly and the top frame can slide together along the axial direction of the placement rod frame. A sampling cylinder is provided on the top frame and is connected to the top of the pull rod frame assembly. The piston unit ends of the multiple sampling cylinder assemblies are inserted into the pull rod frame assembly.

[0007] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In one alternative: the top frame is provided with a front support arm on the side facing the closing strip, the top of the closing strip is provided with a sliding sleeve that can be slidably fitted onto the front support arm, the bottom end of the closing strip is provided with a closing protrusion, and the end of the sampling head in the bottommost sampling cylinder assembly is bent downward and can abut against the upper surface of the closing protrusion.

[0009] In one alternative: two placement rod frames are connected together at their bottom ends via a lower connecting plate frame. The bottom-touch opening and closing unit includes a top rod and a push-pull connecting rod. The top rod can slide through the center of the lower connecting plate frame. An upper plate is provided at the top of the top rod. A closing spring is provided between the upper plate and the upper surface of the lower connecting plate frame, and both ends of the closing spring are connected to both of them respectively. A bottom plate is provided at the bottom of the top rod. One end of the push-pull connecting rod is hinged to the side of the bottom plate, and the other end is hinged to the bottom of the closing strip.

[0010] In one alternative embodiment: the bracket structure includes an arc-shaped bracket and two side extension connecting parts. The arc-shaped bracket is a semi-circular arc structure. The two side extension connecting parts are respectively located on both sides of the arc-shaped bracket. The side extension connecting parts are slidably engaged with the placement rod frame located on the same side. The side extension connecting part at the bottom layer is fastened to the placement rod frame by bolts. The side of the side extension connecting part is also provided with a connecting protrusion, and the connecting protrusion is connected to the center pin of the movable cross rod. The outer wall of the sampling cylinder is provided with a protrusion along its axial direction. The protrusion is fastened to the upper end face of the corresponding side extension connecting part by a screw.

[0011] In one alternative embodiment: the piston unit includes a piston rod, a piston, and a pull plate. The piston is movably installed inside the sampling cylinder. One end of the piston rod is connected to the piston, and the other end extends out of the sampling cylinder. The pull plate is rotatably located at the end of the piston rod away from the piston. The pull rod frame assembly includes a guide arm and two clamping rods. Sampling arms are provided at both ends of the guide arm. The sampling arms are slidably connected to the lower end face of the top frame. One end of the sampling cylinder is connected to the guide arm. Two upper movable sleeves that can slide on the guide arm are provided. The upper movable sleeves are connected to the clamping rods located on the same side by a clamping spring. The tops of the two clamping rods are fixedly connected to the two upper movable sleeves respectively. A gap is left between the two clamping rods, and a rolling groove is formed along their length on their opposing surfaces. The pull plate can be inserted between the two clamping rods and roll within the rolling groove.

[0012] In one alternative embodiment: the height adjustment drive includes a height adjustment cylinder and a synchronizing linkage. The height adjustment cylinder is mounted on the top frame and has a fixed sleeve at its telescopic end. The two ends of the synchronizing linkage are respectively connected to the center pins of the uppermost movable cross rods in the two cross-type height adjustment components. The fixed sleeve is rotatably mounted on the middle of the synchronizing linkage.

[0013] In one alternative embodiment: the top frame is further provided with a control button and has a control module inside; at least one floating sensing component is provided between the two placement rods, located above the topmost sampling cylinder assembly; the floating sensing component includes a floating rod and multiple waterproof pressure sensing plates; both ends of the floating rod are provided with sliding seats, which can be slidably locked onto the side wall of the placement rod; the multiple waterproof pressure sensing plates are evenly distributed along the length of the floating rod; a float is provided on the lower surface of the floating rod; and the control module is electrically connected to the height adjustment cylinder and the float.

[0014] By adopting the above technical solution, the present invention has the following beneficial effects:

[0015] The automatic sampling device for chemical testing provided by this invention, through the combination of a cross-type height adjustment component and a vertically sliding bracket structure, can flexibly and quickly adjust the distribution position of multiple sampling cylinders according to the actual depth of the chemical pool, ensuring that the sampling points are evenly distributed, thereby improving the consistency and representativeness of the sampling. The device employs a structure linking a sealing slat with a bottom-touching opening and closing unit to automatically seal the liquid inlet of the sampling head during the device's lowering process, preventing liquid from entering at depths other than the target depth and ensuring sample purity. The inlet automatically opens when the device touches the bottom, demonstrating a reasonable structure and sensitive response. Through the cooperation of the pull rod frame assembly and the sampling cylinder, multiple piston units can be simultaneously controlled to complete sampling operations at multiple depths in one operation, significantly improving sampling efficiency and reducing human error. The overall structure is compact, easy to operate with robotic arms or automated equipment, and highly adaptable, especially suitable for multi-layer liquid sampling scenarios in large chemical pools, making it highly valuable for widespread application. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the automatic sampling device in one embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the rod placement frame structure in one embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the sampling cylinder assembly from one perspective in one embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the sampling cylinder assembly from another perspective in one embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the internal structure of the sampling cylinder assembly in one embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the bottom-touch opening and closing unit structure in one embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the pull rod frame assembly structure in one embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of the floating sensing component structure in one embodiment of the present invention.

[0025] Figure reference numerals: 100, Sampling cylinder assembly; 110, Sampling cylinder; 120, Sampling head; 130, Piston unit; 131, Piston rod; 132, Piston; 133, Pulling plate; 140, Thrust; 200, Rod holder; 210, Cross-type height adjustment component; 220, Lower connecting plate holder; 300, Top frame; 310, Front support arm; 320, Sampling cylinder; 330, Control button; 400, Bracket structure; 410, Arc-shaped bracket; 420, Side extension connection; 430, Screw; 440, Connecting protrusion; 500, Enclosing strip; 510, Enclosing protrusion; 52 0. Sliding sleeve; 600. Bottom-contact opening and closing unit; 610. Top rod; 620. Base plate; 630. Upper plate; 640. Sealing spring; 650. Push-pull linkage; 700. Pull-out rod assembly; 710. Clamping rod; 711. Groove; 720. Guide arm; 730. Upper movable sleeve; 740. Sampling arm; 750. Clamping spring; 800. Height adjustment drive; 810. Height adjustment cylinder; 820. Synchronous linkage; 830. Fixed sleeve; 900. Floating sensing assembly; 910. Floating rod; 920. Slide seat; 930. Float ball; 940. Waterproof pressure sensor. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The left, right, up, and down positions of the various components shown in the attached diagram are just one arrangement method; the specific positions should be set according to specific needs.

[0028] In one embodiment, such as Figures 1-4As shown, an automatic sampling device for chemical testing includes a sampling cylinder assembly 100, a placement rod frame 200, a top frame 300, a sealing strip 500, a bottom-contact opening and closing unit 600, and a pull-out rod frame assembly 700. Two placement rod frames 200 are arranged opposite each other, with the top of each placement rod frame 200 connected to the top frame 300. Multiple vertically spaced bracket structures 400 are arranged between the two placement rod frames 200. The bottommost bracket structure 400 is fixedly connected to the bottom of the placement rod frame 200, while the sides of the remaining bracket structures 400 are vertically slidably connected to the placement rod frame 200. Each placement pole bracket 200 is equipped with a cross-type height adjustment component 210 on its side. The cross-type height adjustment component 210 is formed by an array of multiple movable cross rods along the length of the placement pole bracket 200, with the fulcrums of two adjacent movable cross rods movably connected. The side of the bracket structure 400 corresponds to one of the movable cross rods and is connected to its intersection point. The top frame 300 is equipped with a height adjustment drive component 800, which is connected to the intersection point of the topmost movable cross rod. Multiple sampling cylinder assemblies 100 are installed on the bracket structure 400. The assembly 100 includes a sampling cylinder 110, a sampling head 120, and a piston unit 130. The sampling cylinder 110 is connected to the bracket structure 400. The sampling head 120 is located at one end of the sampling cylinder 110 and is used to draw sample liquid. The piston unit 130 is located inside the sampling cylinder 110 and extends to the other end of the sampling cylinder assembly 100. The sealing strip 500 and the pull rod frame assembly 700 are located on both sides of the placement rod frame 200, respectively. The top of the sealing strip 500 and the top frame 300 can slide along the axial direction of the placement rod frame 200. The liquid inlet of the sampling head 120 abuts against the sealing strip 500. The bottom-contact opening and closing unit 600 is located at the bottom of the placement rod frame 200 and is connected to the bottom end of the closing strip 500. When the bottom-contact opening and closing unit 600 is subjected to an upward pushing force, it can drive the closing strip 500 away from the placement rod frame 200. The top of the pull rod frame assembly 700 and the top frame part 300 can slide together along the axial direction of the placement rod frame 200. The top frame part 300 is provided with a sampling cylinder 320 and the sampling cylinder 320 is connected to the top of the pull rod frame assembly 700. The piston unit 130 in the multiple sampling cylinder assemblies 100 is inserted into the pull rod frame assembly 700.

[0029] In this embodiment of the invention, before sampling, multiple sampling cylinder assemblies 100 are installed on the bracket structure 400, the bottom-contact opening and closing unit 600 is in its initial state, and the side of the pulling closing strip 500 is pressed against the liquid inlet of the sampling head 120. During sampling, the robot arm or the testing personnel operate the top frame 300 to lower the sampling device into the chemical pool, and the height adjustment drive 800 starts working. The height adjustment drive 800 acts on the top of the cross-type height adjustment component 210. Through the transmission of multiple movable cross rods, the multiple bracket structures 400 that slide in cooperation with the placement rod frame 200... The sampling head 120 moves vertically, with multiple bracket structures 400 maintaining equal spacing until the topmost sampling cylinder assembly 100 approaches the liquid surface of the chemical pool. This allows for adjustment of the distribution of the multiple sampling cylinder assemblies 100 according to the depth of the chemical pool, ensuring equal-spacing depth sampling and guaranteeing the accuracy of the sample liquid at the chemical pool depth. Throughout the lowering process, the sealing strip 500 remains against the liquid inlet of the sampling head 120 to achieve a seal, effectively preventing the chemical liquid from filling the sampling head 120 before the sampling cylinder assembly 100 reaches a certain depth in the chemical pool. The bottom-contact opening and closing unit 60... When the sampler reaches the bottom of the chemical tank, as the placement rod 200 moves downward, the bottom of the chemical tank acts on the bottom-contact opening and closing unit 600, applying an upward pushing force. The bottom-contact opening and closing unit 600 drives the sealing strip 500 away from the placement rod 200, and the sealing strip 500 disengages from the sampling head 120, automatically opening the liquid inlet of the sampling head 120. At this time, the sampling cylinder 320 operates and acts on the pulling rod assembly 700, causing the pulling rod assembly 700 to move away from the sampling cylinder 110. The pulling rod assembly 700 can simultaneously act on the ends of multiple piston units 130. The end of the piston unit 130 that extends into the sampling cylinder 110 moves within the sampling cylinder 110 to create a negative pressure inside. The sample liquid in the chemical pool enters the sampling cylinder 110 through the sampling head 120. After the sample liquid fills the sampling cylinder 110, the entire sampling device moves upward. The bottom-contact opening and closing unit 600 separates from the bottom of the chemical pool and gradually returns to its initial state. The sealing strip 500 moves closer to the sampling head 120 and seals its inlet, ensuring that the upper layer of chemical liquid will not enter the sampling cylinder 110 and contaminate the lower layer of sample liquid that has already been sampled during the upward movement of the sampling device.

[0030] In one embodiment, such as Figure 1 , Figure 2 and Figure 7As shown, the top frame 300 has a front support arm 310 on its side facing the closing strip 500, and a sliding sleeve 520 that can be slidably fitted onto the front support arm 310 is provided on the top of the closing strip 500. A closing protrusion 510 is provided at the bottom end of the closing strip 500. The end of the sampling head 120 in the bottommost sampling cylinder assembly 100 is bent downwards and can abut against the upper surface of the closing protrusion 510. In this embodiment of the invention, when the bottom-contact opening and closing unit 600 is subjected to an upward pushing force from the bottom of the chemical tank, the bottom-contact opening and closing unit 600... The closing unit 600 acts on the closing strip 500 to move it away from the sampling cylinder assembly 100. The closing protrusion 510 disengages from the end of the downwardly bent sampling head 120. The closing strip 500 moves away from the sampling heads 120 in the other sampling cylinder assemblies 100. The liquid inlet of the sampling head 120 opens, allowing sampling. The downwardly bent sampling head 120 can be inserted into the settled sludge. The negative pressure of the sampling cylinder 110 allows the sludge to enter the interior of the sampling cylinder 110, facilitating the sampling of the settled sludge.

[0031] In one embodiment, such as Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, two placement rod frames 200 are connected together at their bottom ends via a lower connecting plate frame 220. The bottom-touching opening and closing unit 600 includes a top rod 610 and a push-pull connecting rod 650. The top rod 610 slidably passes through the center of the lower connecting plate frame 220. An upper plate portion 630 is provided at the top of the top rod 610. A closing spring 640 is provided between the upper plate portion 630 and the upper end face of the lower connecting plate frame 220, and both ends of the closing spring 640 are connected to both. A bottom plate portion 620 is provided at the bottom of the top rod 610. One end of the push-pull connecting rod 650 is hinged to the side of the bottom plate portion 620, and the other end is hinged to the bottom of the closing strip 500. In this embodiment of the invention, the initial state... In the current state, due to the elastic force of the sealing spring 640, the bottom plate 620 is in a state away from the lower connecting plate 220. The bottom plate 620 pulls the sealing strip 500 closer to the sampling head 120 through the push-pull linkage 650, so that the sealing protrusion 510 and the sealing strip 500 seal the liquid inlet of the sampling head 120. When the bottom-touching opening and closing unit 600 is at the bottom of the chemical tank, the bottom plate 620 contacts the bottom of the tank and gradually moves upward relative to the lower connecting plate 220 (or the lower connecting plate 220 moves downward). The bottom plate 620 pushes the sealing strip 500 away from the sampling head 120 through the push-pull linkage 650, so that the liquid inlet of the sampling head 120 opens, so as to draw the sample liquid.

[0032] In one embodiment, such as Figures 1-5As shown, the bracket structure 400 includes an arc-shaped bracket 410 and two side extension connecting parts 420. The arc-shaped bracket 410 has a semi-circular arc structure, and the two side extension connecting parts 420 are respectively provided on both sides of the arc-shaped bracket 410. The side extension connecting parts 420 are slidably engaged with the placement rod frame 200 located on the same side. The bottom side extension connecting part 420 is fastened to the placement rod frame 200 by bolts. The side of the side extension connecting part 420 is also provided with a connecting protrusion 440, and the connecting protrusion 440 is connected to the center pin of the movable cross rod; the sampling cylinder The outer wall of 110 is provided with a protrusion 140 along its axial direction. The protrusion 140 is fastened to the upper end face of the corresponding side extension connecting part 420 by a screw part 430. In this embodiment of the invention, the sampling cylinder 110 is placed on the arc-shaped bracket 410 and supported by it. The screw part 430 fastens the protrusion 140 and the side extension connecting part 420 together. Therefore, the sampling cylinder assembly 100 can be detached from the bracket structure 400. Since the connecting protrusion 440 is connected to the center pin of the movable cross rod, the bracket structure 400 can move vertically with the movable cross rod.

[0033] In one embodiment, such as Figures 1-5As shown, the piston unit 130 includes a piston rod 131, a piston 132, and a pull plate 133. The piston 132 is movably installed inside the sampling cylinder 110. One end of the piston rod 131 is connected to the piston 132, and the other end extends out of the sampling cylinder 110. The pull plate 133 is rotatably located at the end of the piston rod 131 away from the piston 132. The pull rod frame assembly 700 includes a guide arm 720 and two clamping rods 710. Sampling arms 740 are provided at both ends of the guide arm 720. The sampling arms 740 are connected to the top frame. The lower end face of part 300 is slidably connected, and one end of sampling cylinder 320 is connected to guide arm 720. Two upper movable sleeves 730 are provided on guide arm 720, which can slide on it. The upper movable sleeves 730 are connected to clamping rods 710 located on the same side by clamping springs 750. The tops of the two clamping rods 710 are respectively fixedly connected to the two upper movable sleeves 730. There is a gap between the two clamping rods 710, and a groove 711 is opened along their length on their opposite surfaces. Pulling disc 133 can engage the two clamping rods. The sampling cylinder assembly 100 rolls between and within the groove 711. In this embodiment of the invention, after the sampling cylinder assembly 100 is installed on the bracket structure 400, the two clamping rods 710 are pulled apart manually or by a robotic arm. The sampling cylinder 320 adjusts its position by telescopic extension, so that the pulling disc 133 is positioned between the two clamping rods 710. When the two clamping rods 710 are released, under the elastic force of the clamping spring 750, the two clamping rods 710 lock the pulling disc 133, and the edge of the pulling disc 133 is inside the groove 711. The sampling cylinder assembly is then adjusted... At a height of 100, the pull plate 133 rolls inside the groove 711 to reduce friction. When taking sample liquid, the sampling cylinder 320 drives the guide arm 720 to move so that the clamping rod 710 moves away from the sampling cylinder assembly 100. The two clamping rods 710 pull the pull plate 133, and the pull plate 133 drives the piston 132 to move inside the sampling cylinder 110 through the piston rod 131. The front end of the sampling cylinder 110 generates negative pressure to draw in the sample liquid. Multiple sampling cylinder assemblies 100 can achieve synchronous sampling to improve sampling efficiency.

[0034] In one embodiment, such as Figure 1 , Figure 2 and Figure 7As shown, the height adjustment drive component 800 includes a height adjustment cylinder 810 and a synchronous connecting rod 820. The height adjustment cylinder 810 is mounted on the top frame 300, and its telescopic end is provided with a fixed sleeve 830. The two ends of the synchronous connecting rod 820 are respectively connected to the center pins of the uppermost movable cross rods of the two cross-type height adjustment components 210. The fixed sleeve 830 is rotatably sleeved in the middle position of the synchronous connecting rod 820. In this embodiment of the invention, the uppermost movable cross rods of the two cross-type height adjustment components 210 are connected together through the synchronous connecting rod 820, and then driven by the telescopic movement of the height adjustment cylinder 810. The two cross-type height adjustment components 210 can achieve synchronous movement to stably adjust the height position of the bracket structure 400 and the sampling cylinder assembly 100.

[0035] In one embodiment, such as Figure 1 , Figure 7 and Figure 8 As shown, the top frame 300 is also equipped with a control button 330 and has a control module inside. At least one floating sensing component 900 is located above the topmost sampling cylinder assembly 100 between the two placement rod frames 200. The floating sensing component 900 includes a floating rod 910 and multiple waterproof pressure sensing plates 940. Both ends of the floating rod 910 are provided with sliding seats 920, which can be slidably locked onto the side wall of the placement rod frame 200. The multiple waterproof pressure sensing plates 940 are evenly distributed along the length of the floating rod 910. A float portion 930 is provided on the lower surface of the floating rod 910. The control module is electrically connected to the height adjustment cylinder 810 and the float portion 930. In this embodiment of the invention, the placement rod frame 200... Placed in a chemical tank, the chemical liquid in the tank generates buoyancy on the waterproof pressure sensor 940, causing the floating rod 910 and the float 930 to float on the surface of the chemical liquid. Pressing the control button 330 activates the control module, which drives the height adjustment cylinder 810 to extend and retract, adjusting the height of the bracket structure 400 and the sampling cylinder assembly 100 in the chemical tank. When the top of the top sampling cylinder assembly 100 contacts the float 930, the float 930 generates a sensing signal and sends it to the control module in the control button 330. The control module controls the height adjustment cylinder 810 to stop, thereby automatically dividing the sampling layer according to the height of the chemical tank liquid and ensuring that multiple sampling cylinder assemblies 100 are evenly distributed according to the height of the chemical tank liquid.

[0036] The above embodiments provide an automatic sampling device for chemical testing, the working principle of which is as follows:

[0037] Before sampling, multiple sampling cylinder assemblies 100 are installed on the bracket structure 400. In the initial state, the bottom-contact opening and closing unit 600 is in the initial position. The closing strip 500 is pulled by the push-pull connecting rod 650, so that its side abuts against the liquid inlet of each sampling head 120 to achieve a seal. The end of the bottom sampling head 120 is bent downwards and abuts against the upper surface of the sealing protrusion 510 to further enhance the sealing effect.

[0038] During sampling, the entire device is lowered into the chemical pool by a robotic arm or manual operation of the top frame 300. At this time, the height adjustment drive 800 starts working: the height adjustment cylinder 810 drives the fixed sleeve 830 to move, which in turn drives the movable cross rods at the top of the two cross-type height adjustment components 210 to move via the synchronous connecting rod 820. The movable cross rods drive the bracket structure 400 to slide vertically along the placement rod frame 200 via the connecting protrusion 440. Due to the linkage structure of the cross-type height adjustment components 210, the multiple bracket structures 400 always maintain an equal spacing, thereby adjusting the depth position of the multiple sampling cylinder assemblies 100, so that the topmost sampling cylinder assembly 100 is close to the liquid surface of the chemical pool.

[0039] During the lowering of the device, the floating sensing component 900 floats with the liquid surface: the float 930, under the action of buoyancy, drives the floating rod 910 to slide along the slide block 920, causing the waterproof pressure sensing element 940 to sense the liquid level. When the top sampling cylinder assembly 100 contacts the float 930, the floating sensing component 900 sends a signal to the control module in the control button 330. The control module stops the height adjustment cylinder 810, realizing the automatic division of sampling layers according to the liquid level and ensuring that multiple sampling cylinder assemblies 100 are evenly distributed.

[0040] As the device continues to descend to the bottom of the chemical tank, the bottom plate 620 of the bottom-contact opening and closing unit 600 contacts the bottom of the tank and receives an upward thrust, pushing the top rod 610 upward and compressing the sealing spring 640. The top rod 610, through the push-pull connecting rod 650, pushes the sealing strip 500 along the sliding sleeve 520 on the front support arm 310 in a direction away from the sampling head 120, causing the sealing protrusion 510 to disengage from the sampling head 120 and opening the liquid inlet.

[0041] At this time, the sampling cylinder 320 is activated, driving the guide arm 720 of the pull rod assembly 700 to move through the sampling arm 740, causing the clamping rod 710 to move away from the sampling cylinder 110. The clamping rod 710 clamps the pulling disc 133 through the clamping spring 750 and rolls within the roller groove 711, causing the piston rod 131 and piston 132 to retract within the sampling cylinder 110, generating negative pressure. The sample liquid in the chemical pool, including the bottom sludge, is sucked into the sampling cylinder 110 through the sampling head 120.

[0042] After sampling is completed, the device moves upward, the bottom-contact opening and closing unit 600 disengages from the bottom of the pool, the sealing spring 640 resets, the push rod 610 moves downward, and the closing strip 500 is pulled back by the push-pull connecting rod 650 to reseal the liquid inlet of the sampling head 120, preventing the upper liquid from contaminating the sample.

[0043] Finally, the device was removed from the chemical pool, completing multi-layer synchronous sampling at equal depths. This method is suitable for adaptive sampling when the liquid level in the chemical pool changes, improving the accuracy and efficiency of sampling.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

Claims

1. An automatic sampling device for chemical testing, comprising a sampling cylinder assembly (100), a placement rod holder (200), a top frame (300), a sealing strip (500), a bottom-contact opening and closing unit (600), and a pull rod holder assembly (700), wherein there are two placement rod holders (200) arranged opposite to each other, and the top of the placement rod holder (200) is connected to the top frame (300), characterized in that, Multiple vertically spaced bracket structures (400) are provided between the two placement rod frames (200). The bottom bracket structure (400) is fixedly connected to the bottom of the placement rod frame (200), and the sides of the remaining bracket structures (400) are vertically slidably connected to the placement rod frame (200). Each placement pole frame (200) is provided with a cross-type height adjustment component (210) on its side. The cross-type height adjustment component (210) is formed by an array of multiple movable cross rods along the length of the placement pole frame (200), and the fulcrums of two adjacent movable cross rods are movably connected. The side of the bracket structure (400) corresponds to one of the movable cross bars and is connected to its intersection point. The top frame (300) is provided with a height adjustment drive (800) and the height adjustment drive (800) is connected to the intersection point of the topmost movable cross bar. There are multiple sampling cylinder assemblies (100) and they are correspondingly installed on the bracket structure (400). The sampling cylinder assembly (100) includes a sampling cylinder (110), a sampling head (120), and a piston unit (130). The sampling tube (110) is connected to the bracket structure (400), and the sampling head (120) is located at one end of the sampling tube (110) and is used to draw sample liquid; the piston unit (130) is located inside the sampling tube (110) and one end extends to the other end of the sampling tube assembly (100); The sealing strip (500) and the pull rod assembly (700) are located on both sides of the placement rod (200). The top of the sealing strip (500) and the top frame (300) can slide together along the axial direction of the placement rod (200). The inlet of the sampling head (120) is pressed against the sealing strip (500). The bottom-touch opening and closing unit (600) is located at the bottom of the placement rod (200). The bottom-touch opening and closing unit (600) is connected to the bottom end of the sealing strip (500). When the bottom-touch opening and closing unit (600) is subjected to an upward pushing force, it can drive the sealing strip (500) away from the placement rod (200). The top of the pull rod frame assembly (700) and the top frame part (300) can slide together along the axial direction of the placement rod frame (200). A sampling cylinder (320) is provided on the top frame part (300) and the sampling cylinder (320) is connected to the top of the pull rod frame assembly (700). The piston unit (130) in the multiple sampling cylinder assemblies (100) is inserted into the pull rod frame assembly (700). The piston unit (130) includes a piston rod (131), a piston (132), and a pull plate (133). The piston (132) is movably installed inside the sampling cylinder (110). One end of the piston rod (131) is connected to the piston (132), and the other end extends out of the sampling cylinder (110). The pull plate (133) is rotated at the end of the piston rod (131) away from the piston (132). The pull rod frame assembly (700) includes a guide arm (720) and two clamping rods (710). Sampling arms (740) are provided at both ends of the guide arm (720). The sampling arms (740) are slidably connected to the lower end face of the top frame (300). One end of the sampling cylinder (320) is connected to the guide arm (720). The guide arm (720) is provided with two upper movable sleeves (730) that can slide on it. The upper movable sleeves (730) are connected to the clamping rods (710) located on the same side by clamping springs (750). The tops of the two clamping rods (710) are fixedly connected to the two upper movable sleeves (730) respectively. There is a gap between the two clamping rods (710) and a rolling groove (711) is opened along its length on the opposite surface. The pull plate (133) can be engaged between the two clamping rods (710) and roll within the groove (711).

2. The automatic sampling device for chemical testing according to claim 1, characterized in that, The top frame (300) is provided with a front support arm (310) on the side facing the closing strip (500), and a sliding sleeve (520) is provided on the top of the closing strip (500) that can be slidably sleeved on the front support arm (310). The bottom end of the closed strip (500) is provided with a closed protrusion (510), and the end of the sampling head (120) in the bottom sampling tube assembly (100) is bent downward and can abut against the upper surface of the closed protrusion (510).

3. The automatic sampling device for chemical testing according to claim 2, characterized in that, Two placement rods (200) are connected together at the bottom end by a lower connecting plate (220), and the bottom-touch opening and closing unit (600) includes a top rod (610) and a push-pull connecting rod (650). The top rod (610) can slide through the center of the lower connecting plate frame (220). The top of the top rod (610) is provided with an upper plate (630). A closed spring (640) is provided between the upper plate (630) and the upper end face of the lower connecting plate frame (220), and the two ends of the closed spring (640) are respectively connected to the two. The bottom of the top rod (610) is provided with a bottom plate (620). One end of the push-pull connecting rod (650) is hinged to the side of the bottom plate (620), and the other end is hinged to the bottom of the closed strip (500).

4. The automatic sampling device for chemical testing according to claim 1, characterized in that, The bracket structure (400) includes an arc-shaped bracket (410) and two side-extending connecting parts (420). The arc bracket (410) has a semi-circular arc structure. Two side extension connecting parts (420) are respectively provided on both sides of the arc bracket (410). The side extension connecting parts (420) are slidably engaged with the placement rod frame (200) located on the same side. The side extension connecting part (420) at the bottom layer is fastened to the placement rod frame (200) by bolts. The side of the side extension connecting part (420) is also provided with a connecting protrusion (440) and the connecting protrusion (440) is connected to the center pin of the movable cross rod. The outer wall of the sampling cylinder (110) is provided with a boss (140) along its axial direction. The boss (140) is fastened to the upper end face of the corresponding side extension connection (420) by a screw (430).

5. The automatic sampling device for chemical testing according to claim 1, characterized in that, The height adjustment drive (800) includes a height adjustment cylinder (810) and a synchronous connecting rod (820). The height adjustment cylinder (810) is mounted on the top frame (300), and its telescopic end is provided with a fixed sleeve (830). The two ends of the synchronous connecting rod (820) are respectively connected to the center pin of the uppermost movable cross rod in the two cross-type height adjustment components (210); the fixed sleeve (830) is rotated and mounted in the middle of the synchronous connecting rod (820).

6. The automatic sampling device for chemical testing according to claim 5, characterized in that, The top frame (300) is also provided with a control button (330) and has a control module inside; at least one floating sensing component (900) is provided between the two placement rods (200) and located above the topmost sampling tube assembly (100). The floating sensing component (900) includes a floating rod (910) and multiple waterproof pressure sensing plates (940). Both ends of the floating rod (910) are provided with slides (920). The slides (920) can be slidably locked on the side wall of the rod holder (200). The multiple waterproof pressure sensing plates (940) are evenly distributed along the length of the floating rod (910). The lower surface of the floating rod (910) is provided with a float (930). The control module is electrically connected to the height adjustment cylinder (810) and the float (930).

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