A sewage sampling device for environmental monitoring

Abstract

The present application relates to sewage detection technical field, disclose a kind of sewage sampling device for environmental monitoring, including central tank, test tube cover, sampling tube and sealing piston, the test tube cover is fixedly installed with rotating shaft, the rotating shaft annular array distribution is at the outside of central tank, and rotating shaft is rotatably connected with the side wall of central tank;The sewage sampling device for environmental monitoring is set by sealing piston, sampling tube, drive pipe and positive piston lifting mechanism, when the drive pipe is positively rotated, all sealing pistons are sequentially opened briefly to complete sampling according to predetermined order, and timely closed before the next piston opens, avoid the water body violent disturbance caused by multiple sampling ports simultaneously opening, cooperate the setting of reverse piston lifting mechanism and test tube rotating mechanism, when the drive pipe is reversed, all pistons can be controlled to be lifted and opened synchronously first, then let all sampling tubes rotate and tilt, sampling tubes are conveniently taken out from test tube cover or water in sampling tube is directly poured out.

Description

Technical Field

[0001] This invention relates to the field of wastewater testing technology, specifically to a wastewater sampling device for environmental monitoring. Background Technology

[0002] Environmental monitoring is a crucial step in assessing water quality and controlling pollution emissions, and wastewater sampling is the first step in this monitoring process. The representativeness and accuracy of the samples directly affect the reliability of subsequent analytical results. In practical applications, wastewater has a complex composition, often containing large particulate impurities such as aquatic plants and suspended solids. If these impurities are directly introduced into the sampling container, they may not only clog the pipes but also contaminate the sample, affecting the accuracy of the detection. Furthermore, to ensure that the inner wall of the sampling container is not affected by residual contaminants, it usually needs to be rinsed multiple times before sampling.

[0003] Chinese patent CN113588343B discloses a wastewater cross-sectional sampling device for water quality environmental testing. Its core working principle involves submerging multiple sampling bottles in water using a hanging frame, and utilizing water pressure and air release to complete static sampling at different depths. The advantage of this technical solution is that it can obtain cross-sectional water samples from different depths of the water body at once, facilitating accurate analysis of the vertical distribution of pollution in the water and achieving the function of stratified sampling.

[0004] Before sampling wastewater, the above-mentioned device is not convenient for repeatedly rinsing the sampling container. Its sampling bottle is fixedly installed. If rinsing is required, the device needs to be lifted out of the water, the sampling bottle needs to be disassembled, manually cleaned, and then reinstalled. Secondly, when collecting multiple samples, if multiple samplers are turned on at the same time, it will violently disturb the water around the sampling point, resulting in the samples collected successively being taken from the turbid mixed water, which cannot truly reflect the original water quality at the preset location of each sampling port. In addition, the device lacks an effective pre-filtration mechanism and cannot prevent large particles such as aquatic plants and leaves in the water from entering the sampling container. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a wastewater sampling device for environmental monitoring, which features orderly sampling, easy rinsing, and pre-filtration of impurities, thus solving the problems mentioned in the background section.

[0006] (II) Technical Solution To solve the above-mentioned technical problems, the present invention provides the following technical solution: A wastewater sampling device for environmental monitoring includes a central tank, a test tube sleeve, a sampling tube, and a sealing piston. A rotating shaft is fixedly mounted on the test tube sleeve, and the rotating shafts are arranged in a circular array on the outside of the central tank, rotatably connected to the side wall of the central tank. The sampling tube is detachably installed inside the test tube sleeve. The sealing piston is positioned above the test tube sleeve and can slide vertically along the outer wall of the central tank. The central tank contains a drive tube, a forward-rotating piston lifting mechanism, a reverse-rotating piston lifting mechanism, and a test tube rotation mechanism. The drive tube is rotatably installed inside the central tank. When the drive tube rotates forward, the forward-rotating piston lifting mechanism controls all the sealing pistons to move upward sequentially and separate from the opening of the sampling tube, and re-seals the tube before the next sealing piston separates from the opening of the sampling tube. When the drive tube rotates in reverse, the reverse-rotating piston lifting mechanism first controls all the sealing pistons to move upward simultaneously and separate from the opening of the sampling tube, and then the test tube rotation mechanism drives the rotating shaft to rotate, thereby discharging the sample from the sampling tube.

[0007] Preferably, the sealing piston is provided with a lifting control assembly, which includes a sealing cover, a gear frame, an intermediate gear, and a rack. The sealing cover is fixedly installed on the outer wall of the central tank, and the lower end of the sealing cover is slidably connected to the sealing piston. The outer wall of the central tank has an insertion port communicating with the inside of the sealing cover. The gear frame is fixedly installed on the upper end of the sealing piston. The two ends of the intermediate gear are rotatably connected to the two side walls of the sealing cover, and the intermediate gear is adapted to mesh with the tooth groove on one side of the inner wall of the gear frame. One end of the rack slides horizontally through the insertion port to the inside of the central tank, and the rack is adapted to mesh with the intermediate gear.

[0008] Preferably, the forward-rotating piston lifting mechanism includes a forward-rotating piston lifting disc, a protrusion, an abutment block, and a piston return spring. The forward-rotating piston lifting disc is rotatably mounted inside the central tank and is unidirectionally rotatably connected to the drive tube. The protrusion is fixedly mounted on the outer edge of the forward-rotating piston lifting disc. The abutment block is fixedly mounted on one end of the rack extending into the central tank and abuts against the forward-rotating piston lifting disc. The two ends of the piston return spring are fixedly connected to one side wall of the abutment block and the inner side wall of the central tank, respectively. When the drive tube rotates forward, it drives the forward-rotating piston lifting disc to rotate. When the protrusion contacts the abutment block, the piston return spring is compressed and contracts, and the abutment block moves inward toward the sealing cover, pushing the intermediate gear to rotate, causing the sealing piston to move upward and separate from the opening of the sampling tube. When the abutment block separates from the protrusion, the piston return spring returns and extends, and the abutment block pushes the intermediate gear to rotate in the opposite direction, causing the sealing piston to move downward and re-close the opening of the sampling tube. When the drive tube rotates in reverse, the forward-rotating piston lifting disc remains stationary.

[0009] Preferably, the reversing piston lifting mechanism includes a reversing piston lifting turntable, a drive track groove, a driven rod, and a turntable return spring. The reversing piston lifting turntable is rotatably mounted inside the central tank and is unidirectionally rotatably connected to the drive tube. The drive track groove is formed on the reversing piston lifting turntable. The driven rod is fixedly mounted on a rack and slidably mounted inside the drive track groove. One end of the turntable return spring is connected to the inner wall of the central tank, and the other end is connected to the reversing piston lifting turntable. The drive track groove includes a stationary sliding part, a rotating pushing part, and a rotating stationary part that are interconnected. The stationary sliding part is a straight groove whose extension direction points towards the axis of the drive tube. When the reversing piston lifting turntable is stationary, the driven rod can slide freely within the stationary sliding part. The rotating pushing part is an inclined groove that is close to... The distance between one end of the near-stationary sliding part and the axis of the drive tube is less than the distance between the other end and the axis of the drive tube. When the rotating disc of the reversing piston moves from the stationary sliding part to the rotating stationary part, it pushes the abutment block to move into the interior of the sealing cover, drives the intermediate gear to rotate, and causes the sealing piston to move upward and separate from the opening of the sampling tube. The rotating stationary part is an arc-shaped groove, and its arc center coincides with the axis of the drive tube. When the rotating disc of the reversing piston moves and the driven rod slides in the rotating stationary part, the abutment block remains stationary. When the drive tube reverses and drives the rotating disc of the reversing piston to rotate, the disc return spring is stretched. When the drive tube rotates forward, the disc return spring contracts and pulls the rotating disc of the reversing piston to rotate and return to its original position, so that the driven rod slides from the rotating stationary part to the interior of the stationary sliding part. When the driven rod enters the stationary sliding part, the rotating disc of the reversing piston remains stationary when the drive tube rotates forward.

[0010] Preferably, the test tube rotation mechanism includes a driven tube, a misaligned transmission assembly, a test tube rotating gear, a transmission gear, and a gear return spring. The driven tube is rotatably mounted at the lower end of the drive tube via the misaligned transmission assembly. The test tube rotating gear is rotatably mounted inside the central tank and is unidirectionally rotatably connected to the driven tube. The transmission gear is fixedly mounted at one end of the rotating shaft extending into the central tank and meshes with the test tube rotating gear. One end of the gear return spring is connected to the inner wall of the central tank, and the other end is connected to the test tube rotating gear. When the driven tube reverses to drive the test tube rotating gear to rotate, the gear return spring is stretched. When the driven tube rotates clockwise, the gear return spring contracts, pulling the test tube rotating gear to rotate and return to its original position, so that the sampling tube returns from an inclined state to a vertical state. When the sampling tube returns to a vertical state, the test tube rotating gear remains stationary when the driven tube rotates clockwise.

[0011] Preferably, the misalignment transmission assembly includes an upper connecting plate, a lower connecting plate, a slide rod, and an arc-shaped misalignment groove. The upper connecting plate is fixedly installed at the lower end of the drive tube, the lower connecting plate is fixedly installed at the upper end of the driven tube, the slide rod is fixedly installed on the lower surface of the upper connecting plate, and the arc-shaped misalignment groove is formed on the lower connecting plate and is slidably connected to the slide rod. When the drive tube reverses, the slide rod rotates in the arc-shaped misalignment groove. Only when the slide rod rotates to abut against one end of the arc-shaped misalignment groove can it push the lower connecting plate to rotate.

[0012] Preferably, a main pipe is fixedly installed at the upper end of the central tank, and a drive rod is provided inside the main pipe. The drive rod can rotate and slide vertically inside the main pipe. The lower end of the drive rod passes through the upper end of the central tank and extends into the interior of the central tank. The drive rod is slidably connected to the inner wall of the drive tube. The lower end of the drive rod also extends into the interior of the driven tube. The drive rod can rotate and slide vertically inside the driven tube. A handle is fixedly installed on the main pipe.

[0013] Preferably, a top plate and a bottom plate are fixedly installed at the upper and lower ends of the outer side of the central tank, respectively. A filter plate is provided between the top plate and the bottom plate. A connecting rod is rotatably installed at one end of the filter plate. The two ends of the connecting rod are fixedly connected to the top plate and the bottom plate, respectively. A pressure plate and a filter plate return spring are also provided inside the central tank. The pressure plate is rotatably installed at the lower end of the drive rod. The two ends of the filter plate return spring are fixedly connected to the lower surface of the pressure plate and the inner bottom wall of the central tank, respectively. A second insertion port is opened at the bottom of the side wall of the central tank. A push plate is horizontally slidably installed inside the second insertion port. An inner rotating plate and an outer rotating plate are rotatably installed at both ends of the push plate, respectively. The inner rotating plate is rotatably connected to the pressure plate, and the outer rotating plate is rotatably connected to the filter plate.

[0014] Preferably, a plug rod is installed on the side wall of the main tube, and an annular groove is formed on the side of the drive rod. One end of the plug rod extends into the interior of the main tube and into the interior of the annular groove. When the plug rod abuts against the inner side wall of the annular groove, the drive rod can only rotate inside the main tube and cannot slide up and down.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a wastewater sampling device for environmental monitoring, which has the following beneficial effects: 1. This wastewater sampling device for environmental monitoring, by setting up a sealing piston, a sampling tube, a drive tube, and a forward-rotating piston lifting mechanism, enables all sealing pistons to be controlled to open briefly in a predetermined order to complete sampling when the drive tube rotates forward, and to close in time before the next piston opens, avoiding violent disturbance of the water body caused by multiple sampling ports opening at the same time, and ensuring that the original water sample at the corresponding sampling port position can be obtained each time. At the same time, with the setting of the reverse piston lifting mechanism and the test tube rotation mechanism, when the drive tube reverses, all pistons can be controlled to lift and open synchronously first, and then all sampling tubes can be rotated and tilted, which makes it easy to remove the sampling tube from the test tube sleeve or directly pour out the water in the sampling tube, and facilitates the discharge of waste liquid during rinsing.

[0016] 2. This wastewater sampling device for environmental monitoring, through the setting of a lifting control assembly consisting of a sealing cover, a gear frame, an intermediate gear and a rack, as well as a forward-rotating piston lifting turntable with protrusions connected unidirectionally to the drive tube, an abutment block fixed to the end of the rack and a piston return spring, allows the protrusions on the turntable to sequentially press each abutment block when the drive tube rotates forward, forcing the rack to move horizontally. Then, through the meshing of the intermediate gear and the gear frame, the horizontal movement is converted into the vertical lifting movement of the sealing piston to achieve opening and sampling. After the protrusions rotate past the abutment blocks, the return force of the piston return spring immediately pushes the rack and the intermediate gear to move in the opposite direction, driving the sealing piston to quickly and reliably return downward and reseal the sampling tube opening, ensuring the instantaneous and independent opening and closing of each sealing piston.

[0017] 3. This wastewater sampling device for environmental monitoring, through the setting of a reversing piston lifting turntable with a specially contoured drive track groove connected unidirectionally to the drive pipe, driven rods fixed on the rack, and a turntable return spring, ensures that when the drive pipe reverses, the turntable rotates and synchronously pushes all driven rods through the rotational pushing part of its drive track groove, thereby causing all racks to move and controlling all sealing pistons to lift synchronously to achieve unified opening of all sampling tubes. At the same time, by setting a driven pipe with a staggered transmission component, a test tube rotating chamber gear plate connected unidirectionally to the driven pipe, a transmission gear connected to the rotating shaft, and a gear plate return spring, the reversing motion of the drive pipe drives the test tube rotating chamber gear plate to rotate only after a certain idle delay, thereby driving all sampling tubes to rotate, tilt, and discharge samples, ensuring the sequential order of the piston opening and test tube rotation.

[0018] 4. This wastewater sampling device for environmental monitoring, through the setting of a filter plate, push plate, rotating plate and return spring mechanism controlled by a drive rod, ensures that the filter plate remains closed under natural water pressure during the device's descent to the sampling depth, thus preventing large particles such as aquatic plants and leaves from entering the central tank and sampling tube. This protects the internal precision transmission components and sampling pipeline from blockage. After sampling, the pressure plate is moved down by the downward drive rod, and then the filter plate is pushed outward by the linkage of the inner and outer rotating plates and push plate, so that the test tube inside the filter plate can be removed if necessary. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the wastewater sampling device for environmental monitoring according to the present invention; Figure 2 This is a partial structural schematic diagram of the wastewater sampling device for environmental monitoring according to the present invention; Figure 3 This is a partial exploded view of the wastewater sampling device for environmental monitoring according to the present invention; Figure 4 This is one of the three-dimensional structural cross-sectional views of the wastewater sampling device for environmental monitoring of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the local structure at point A; Figure 6 This is a second three-dimensional structural cross-sectional view of the wastewater sampling device for environmental monitoring according to the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the local structure at point B; Figure 8 This is the third three-dimensional structural cross-sectional view of the wastewater sampling device for environmental monitoring of the present invention; Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the local structure at point C; Figure 10 This is the fourth three-dimensional structural cross-sectional view of the wastewater sampling device for environmental monitoring of the present invention; Figure 11 For the present invention Figure 10 Enlarged schematic diagram of the local structure at point D; Figure 12 For the present invention Figure 10 A magnified schematic diagram of the local structure at point E in the middle.

[0020] In the picture: 1. Central tank; 11. Inlet 1; 12. Top plate; 13. Bottom plate; 14. Inlet 2; 2. Test tube sleeve; 21. Sampling tube; 22. Rotating shaft; 3. Sealing piston; 31. Sealing cover; 32. Gear frame; 33. Intermediate gear; 34. Rack; 4. Drive tube; 5. Forward piston lifting mechanism; 51. Forward piston lifting turntable; 52. Protrusion; 53. Abutment block; 54. Piston return spring; 6. Reverse piston lifting mechanism; 61. Reverse piston lifting turntable; 62. Drive track groove; 621. Stationary sliding part; 622. Rotary pushing part; 623. Rotating stationary part; 63. Driven rod; 64. Turntable return spring; 7. Test tube rotation mechanism; 71. Driven tube; 72. Misalignment transmission assembly; 721. Upper connecting plate; 722. Lower connecting plate; 723. Slide rod; 724. Arc-shaped misalignment groove; 73. Test tube rotating gear; 74. Transmission gear; 75. Gear return spring; 8. Filter plate; 81. Connecting rod; 82. Pressure plate; 83. Filter plate return spring; 84. Push plate; 85. Inner rotating plate; 86. Outer rotating plate; 9. Main pipe; 91. Drive rod; 92. Insert rod; 93. Annular groove. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0022] Example 1 Please see Figure 1 , Figure 2 , Figure 4 and Figure 10This invention provides a wastewater sampling device for environmental monitoring, comprising a central tank 1, a test tube sleeve 2, a sampling tube 21, and a sealing piston 3. A rotating shaft 22 is fixedly mounted on the test tube sleeve 2, and the rotating shafts 22 are arranged in a circular array on the outer side of the central tank 1, with the rotating shafts 22 rotatably connected to the side wall of the central tank 1. The sampling tube 21 is detachably installed on the inner side of the test tube sleeve 2. The sealing piston 3 is positioned above the test tube sleeve 2 and can slide vertically along the outer wall of the central tank 1. The central tank 1 is internally equipped with a drive tube 4, a forward-rotating piston lifting mechanism 5, a reverse-rotating piston lifting mechanism 6, and... The test tube rotation mechanism 7 drives the tube 4 to rotate inside the central tank 1. When the drive tube 4 rotates forward, the forward rotation piston lifting mechanism 5 controls all the sealing pistons 3 to move upward in sequence and separate from the opening of the sampling tube 21, and re-seals before the next sealing piston 3 separates from the opening of the sampling tube 21. When the drive tube 4 rotates in reverse, the reverse rotation piston lifting mechanism 6 controls all the sealing pistons 3 to move upward simultaneously and separate from the opening of the sampling tube 21, and then the test tube rotation mechanism 7 drives the rotating shaft 22 to rotate, thereby discharging the sample in the sampling tube 21.

[0023] As can be seen from the above, the device controls two independent mechanisms through the forward and reverse rotation directions of a drive tube 4, realizing two key sampling operation modes. When the drive tube 4 rotates forward, the forward rotation piston lifting mechanism 5 sequentially controls the sealing pistons 3 arranged in a ring array to open and close briefly, so that the corresponding sampling tubes 21 can independently complete sewage sampling in sequence without interfering with each other or violently disturbing the water body, ensuring that each water sample can represent the original water quality of its corresponding sampling port. When the drive tube 4 rotates in reverse, the reverse rotation piston lifting mechanism 6 first controls all the sealing pistons 3 to open simultaneously, and then the test tube rotation mechanism 7 is driven, causing all the sampling tubes 21 to rotate and tilt around its axis 22. This mode facilitates the unified rinsing of multiple sampling tubes 21 before sampling, or the rapid discharge of all samples after sampling.

[0024] When using this device, first, submerge the device to a predetermined depth in the water body to be monitored; When sequential sampling is required, the operator controls the drive tube 4 to rotate forward: the forward rotation of the drive tube 4 will drive the forward piston lifting mechanism 5 to work. This mechanism will lift each sealing piston 3 in a predetermined order, so that it briefly leaves the corresponding sampling tube 21 opening. Under the action of external water pressure, the water sample flows into each sampling tube 21 in sequence. After a sealing piston 3 completes sampling and falls down to reseal the tube opening, the next sealing piston 3 will be lifted. When it is necessary to rinse the sampling tube 21 or remove the collected water sample, the drive tube 4 is controlled to rotate in the reverse direction: the reverse rotation first triggers the reverse piston lifting mechanism 6, causing all the sealing pistons 3 to rise synchronously and open the openings of all the sampling tubes 21; then, the reverse movement of the drive tube 4 is further transmitted through the test tube rotation mechanism 7, driving all the rotating shafts 22 to rotate synchronously, so that the sampling tubes 21 installed in the test tube sleeve 2 tilt together. The tilt angle can be manually adjusted to decide whether to pour out all the liquid in the sampling tube 21 for rinsing or to only tilt the sampling tube 21 slightly to make it easier to remove the sampling tube 21.

[0025] Example 2 like Figure 2 , Figure 3 , Figure 5 - Figure 9 As shown, the difference between this embodiment and the above embodiment is that the sealing piston 3 is provided with a lifting control assembly. The lifting control assembly includes a sealing cover 31, a gear frame 32, an intermediate gear 33, and a rack 34. The sealing cover 31 is fixedly installed on the outer side wall of the central tank 1, and the lower end of the sealing cover 31 is slidably connected to the sealing piston 3. The outer side wall of the central tank 1 has an insertion port 11 that communicates with the inside of the sealing cover 31. The gear frame 32 is fixedly installed on the upper end of the sealing piston 3. The two ends of the intermediate gear 33 are rotatably connected to the two side walls of the sealing cover 31, and the intermediate gear 33 is adapted to mesh with the tooth groove on one side of the inner wall of the gear frame 32. One end of the rack 34 slides horizontally through the insertion port 11 to extend into the inside of the central tank 1, and the rack 34 is adapted to mesh with the intermediate gear 33.

[0026] As can be seen from the above, the lifting control component converts the horizontal linear motion of the drive mechanism inside the central tank 1 into the vertical lifting motion of the sealing piston 3. The horizontal movement of the rack 34 drives the intermediate gear 33 to rotate through meshing with the intermediate gear 33. Then, through the meshing of the intermediate gear 33 with the gear frame 32, the rotational motion is converted into the vertical lifting motion of the gear frame 32 and the sealing piston 3 fixed on it, thereby realizing the opening and closing of the sampling tube 21. The sealing cover 31 ensures the isolation of this transmission mechanism from the external sewage environment.

[0027] The forward-rotating piston lifting mechanism 5 includes a forward-rotating piston lifting disc 51, a protrusion 52, an abutment block 53, and a piston return spring 54. The forward-rotating piston lifting disc 51 is rotatably mounted inside the central tank 1 and is unidirectionally rotatably connected to the drive tube 4. The protrusion 52 is fixedly mounted on the outer edge of the forward-rotating piston lifting disc 51. The abutment block 53 is fixedly mounted on one end of the rack 34 extending into the central tank 1 and abuts against the forward-rotating piston lifting disc 51. The two ends of the piston return spring 54 are fixedly connected to one side wall of the abutment block 53 and the inner side wall of the central tank 1, respectively. When the drive tube 4 rotates forward, it drives the forward-rotating piston to lift the turntable 51. When the protrusion 52 contacts the abutment block 53, the piston return spring 54 is compressed and contracts. The abutment block 53 moves into the interior of the sealing cover 31, pushing the intermediate gear 33 to rotate, causing the sealing piston 3 to move upward and separate from the opening of the sampling tube 21. When the abutment block 53 separates from the protrusion 52, the piston return spring 54 returns to its original position and extends. The abutment block 53 pushes the intermediate gear 33 to rotate in the opposite direction, causing the sealing piston 3 to move downward and re-close the opening of the sampling tube 21. When the drive tube 4 rotates in reverse, the forward-rotating piston lift turntable 51 remains stationary.

[0028] As can be seen from the above, when the drive tube 4 rotates forward, it drives the forward piston lifting turntable 51 connected to it in one direction to rotate. During the rotation, the protrusion 52 on the outer edge of the forward piston lifting turntable 51 will contact and push the abutment block 53 at the end of each rack 34 in turn, forcing the rack 34 to move horizontally towards the sealing cover 31. Then, the lifting control component converts this horizontal movement into the lifting movement of the corresponding sealing piston 3, so that it leaves the sampling tube 21 opening and the water sample can flow in. After the protrusion 52 rotates past the abutment block 53, the compressed piston return spring 54 releases its elastic force, pushing the abutment block 53 and the rack 34 to move in the opposite direction, so that the sealing piston 3 falls quickly and reseals the tube opening. In this embodiment, only one protrusion 52 is provided on the outer edge of the forward piston lifting turntable 51, that is, the drive tube 4 must rotate one revolution to ensure that all sealing pistons 3 have been opened once. When the drive tube 4 reverses, the one-way connection between the turntable and the drive tube 4 slips, and the forward-rotating piston lifts the turntable 51 to remain stationary, without interfering with the operation of the reverse mode.

[0029] The reverse piston lifting mechanism 6 includes a reverse piston lifting turntable 61, a drive track groove 62, a driven rod 63, and a turntable return spring 64. The reverse piston lifting turntable 61 is rotatably mounted inside the central tank 1 and is unidirectionally rotatably connected to the drive tube 4. The drive track groove 62 is formed on the reverse piston lifting turntable 61. The driven rod 63 is fixedly mounted on the rack 34 and slidably mounted inside the drive track groove 62. One end of the turntable return spring 64 is connected to the center... The inner wall of tank 1 is connected, and the other end of the turntable return spring 64 is connected to the reverse piston lifting turntable 61; the drive track groove 62 includes a stationary sliding part 621, a rotary pushing part 622, and a rotary stationary part 623 that are interconnected; the stationary sliding part 621 is a straight groove, and its extension direction is towards the axis of the drive tube 4. When the reverse piston lifting turntable 61 is stationary, the driven rod 63 can slide freely in the stationary sliding part 621; the rotary pushing part 622 is an inclined groove, and its end near the stationary sliding part 621 The distance between the reverse piston lifting turntable 61 and the axis of the drive tube 4 is less than the distance between the other end of the reverse piston lifting turntable 61 and the axis of the drive tube 4. When the reverse piston lifting turntable 61 rotates, causing the driven rod 63 to move from the stationary sliding part 621 to the rotating stationary part 623, it pushes the abutment block 53 to move into the interior of the sealing cover 31, and pushes the intermediate gear 33 to rotate, so that the sealing piston 3 moves upward and separates from the opening of the sampling tube 21. The rotating stationary part 623 is an arc-shaped groove, and its arc center coincides with ... axis of the drive tube 4, it pushes the abutment block 53 to move into the interior of the sealing cover 31, and pushes the intermediate gear 33 to rotate, so that the sealing piston 3 moves upward and separates from the opening of the sampling tube 21. 3. When the rotating stationary part 623 slides, the abutment block 53 remains stationary; when the drive tube 4 reverses to drive the reverse piston to lift the turntable 61 to rotate, the turntable return spring 64 is stretched. When the drive tube 4 rotates forward, the turntable return spring 64 contracts and pulls the reverse piston to lift the turntable 61 to rotate and reset, so that the driven rod 63 slides from the rotating stationary part 623 to the interior of the stationary sliding part 621. When the driven rod 63 enters the stationary sliding part 621, the reverse piston to lift the turntable 61 remains stationary when the drive tube 4 rotates forward.

[0030] As can be seen from the above, when the drive tube 4 reverses, the drive reversing piston lifting turntable 61 rotates. When the driven rod 63 is in the stationary sliding part 621, the mechanism is in a ready state. As the reversing piston lifting turntable 61 rotates, the inclined surface of the rotating pushing part 622 of the drive track groove 62 will push all driven rods 63 to slide synchronously, thereby pulling all racks 34 to move horizontally, and making all sealing pistons 3 rise synchronously through the lifting control component. When the driven rod 63 enters the rotating stationary part 623, the rack 34 position is locked, and the sealing piston 3 remains in the open state. The function of the turntable return spring 64 is to pull the reversing piston lifting turntable 61 to rotate in the opposite direction and reset when the drive tube 4 rotates forward, so that the driven rod 63 slides from the rotating stationary part 623 back to the stationary sliding part 621 through the rotating pushing part 622, preparing for the next reversing operation. Good preparation; In this embodiment, whether the driven rod 63 can enter the rotating push part 622 from the stationary sliding part 621 depends on whether the protrusion 52 squeezes a certain abutment block 53 when the drive tube 4 reverses. Using existing technology, the rotation angle of the drive tube 4 can be controlled. For example, a sleeve is set on the forward rotating piston lifting turntable 51, and a slope groove is opened on the sleeve. A spring pin is set inside the central tank 1. When the protrusion 52 on the forward rotating piston lifting turntable 51 contacts and squeezes a certain abutment block 53, the drive tube 4 stops rotating. The spring pin squeezes the slope groove of the sleeve, so that when the forward rotating piston lifting turntable 51 stops rotating, the spring pin can be locked into the deepest part of the slope groove, thereby achieving that when the drive tube 4 stops rotating forward, all the sealing pistons 3 are sealed with the opening of the sampling tube 21.

[0031] The test tube rotation mechanism 7 includes a driven tube 71, a misaligned transmission assembly 72, a test tube rotating gear 73, a transmission gear 74, and a gear return spring 75. The driven tube 71 is rotatably mounted on the lower end of the drive tube 4 via the misaligned transmission assembly 72. The test tube rotating gear 73 is rotatably mounted inside the central container 1, and the test tube rotating gear 73 is unidirectionally rotatably connected to the driven tube 71. The transmission gear 74 is fixedly mounted on one end of the rotating shaft 22 extending into the central container 1, and the transmission gear 74 meshes with the test tube rotating gear 73. One end of the gear return spring 75 is connected to the inner wall of the central container 1, and the other end of the gear return spring 75 is connected to the test tube rotating gear 73. When the driven tube 71 reverses to drive the test tube rotating gear 73 to rotate, The toothed disc return spring 75 is stretched. When the driven tube 71 rotates forward, the toothed disc return spring 75 contracts and pulls the test tube rotating toothed disc 73 to rotate and reset, so that the sampling tube 21 returns from the inclined state to the vertical state. When the sampling tube 21 returns to the vertical state, the test tube rotating toothed disc 73 remains stationary when the driven tube 71 rotates forward. In this embodiment, the tooth grooves on the test tube rotating toothed disc 73 are not distributed in a ring array at all positions on the outer end of the upper surface of the test tube rotating toothed disc 73, but are arranged in groups of several tooth grooves. Four groups of tooth grooves are distributed in a ring array on the upper surface of the test tube rotating toothed disc 73. There are protruding blocks between adjacent groups of tooth grooves, so that each transmission gear 74 can only move within the range of one group of tooth grooves, thereby limiting the rotation angle of the sampling tube 21.

[0032] As can be seen from the above, when the reverse motion of the drive tube 4 is finally transmitted to the driven tube 71 through the misaligned transmission assembly 72, the driven tube 71 reverses and drives the test tube rotating gear 73 connected to it in one direction to rotate. The test tube rotating gear 73, through meshing with the transmission gear 74, drives all the rotating shafts 22 to rotate synchronously, thereby changing the sampling tube 21 installed on the test tube sleeve 2 from a vertical state to an inclined state. The gear plate return spring 75 is used to pull the test tube rotating gear 73 to rotate back to its original position when the drive tube 4 changes to a forward rotation, so that the sampling tube 21 returns to a vertical state. The one-way connection between the test tube rotating gear 73 and the driven tube 71 ensures that the driven tube 71 will not drive the test tube rotating gear 73 to rotate when rotating in the forward direction.

[0033] The misalignment transmission assembly 72 includes an upper connecting plate 721, a lower connecting plate 722, a slide rod 723, and an arc-shaped misalignment groove 724. The upper connecting plate 721 is fixedly installed at the lower end of the drive tube 4, the lower connecting plate 722 is fixedly installed at the upper end of the driven tube 71, the slide rod 723 is fixedly installed on the lower surface of the upper connecting plate 721, and the arc-shaped misalignment groove 724 is formed on the lower connecting plate 722, and the arc-shaped misalignment groove 724 is slidably connected to the slide rod 723. When the drive tube 4 reverses, the slide rod 723 rotates in the arc-shaped misalignment groove 724. Only when the slide rod 723 rotates to abut against one end of the arc-shaped misalignment groove 724 can it push the lower connecting plate 722 to rotate.

[0034] As can be seen from the above, the function of the misaligned transmission assembly 72 is to provide a free travel between the drive tube 4 and the driven tube 71 in reverse mode. When the drive tube 4 begins to reverse, the driven tube 71 drives the slide rod 723, which is fixed to the lower surface of the upper connecting plate 721, to idle in the arc-shaped misaligned groove 724 of the lower connecting plate 722, without immediately driving the driven tube 71 to rotate. This idle travel time ensures that the reverse piston lifting mechanism 6 has enough time to complete the synchronous lifting of all the sealing pistons 3. Only when the slide rod 723 has rotated through the free travel and abuts one end of the arc-shaped misaligned groove 724 will it begin to push the driven tube 71 to rotate, thereby driving the test tube rotating mechanism 7 to work. This ensures the action sequence of "first fully opening the cap, then rotating the test tube".

[0035] In this embodiment, it is mentioned that the forward-rotating piston lifting disc 51 is unidirectionally connected to the drive tube 4, the reverse-rotating piston lifting disc 61 is unidirectionally connected to the drive tube 4, and the test tube rotating gear disc 73 is unidirectionally connected to the driven tube 71. However, in this embodiment, the unidirectional rotation directions of the reverse-rotating piston lifting disc 61 and the drive tube 4, and the test tube rotating gear disc 73 and the driven tube 71 are the same, and both are opposite to the unidirectional rotation direction between the forward-rotating piston lifting disc 51 and the drive tube 4. In the prior art, there are mechanical mechanisms that can limit the unidirectional transmission structure between two coaxially mounted structures, such as fixing a disc on the drive tube 4, opening a groove on the disc, and allowing passage within the groove. A one-way locking block is connected by a spring, and a ring is fixedly installed on the axis of the forward rotating piston lifting turntable 51. A one-way locking groove adapted to the one-way locking block is opened on the inner side wall of the ring, and a damping structure is set between the forward rotating piston lifting turntable 51 and the inner wall of the center tank 1 to prevent small forces from pushing the forward rotating piston lifting turntable 51 to rotate. When the drive tube 4 rotates forward, the one-way locking block pushes the one-way locking groove, so that the forward rotating piston lifting turntable 51 rotates forward. When the drive tube 4 rotates in reverse, under the obstruction of the damping structure, the one-way locking block is pressed back into the slide groove when it squeezes the one-way locking groove, and cannot push the forward rotating piston lifting turntable 51 to rotate. There are similar mechanical parts in the prior art, such as an overrunning clutch.

[0036] Example 3 like Figure 1 , Figure 2 , Figure 4 , Figure 10 , Figure 11 and Figure 12As shown, the difference between this embodiment and the above embodiment is that a main pipe 9 is fixedly installed at the upper end of the central tank 1, and a drive rod 91 is provided inside the main pipe 9. The drive rod 91 can rotate and slide vertically inside the main pipe 9. The lower end of the drive rod 91 passes through the upper end of the central tank 1 and extends into the interior of the central tank 1. The drive rod 91 is slidably connected to the inner wall of the drive tube 4. The lower end of the drive rod 91 also extends into the interior of the driven tube 71. The drive rod 91 can rotate and slide vertically inside the driven tube 71. A handle is fixedly installed on the main pipe 9.

[0037] As can be seen from the above, the drive rod 91 integrates rotation and axial sliding functions. Its lower end is inserted into the drive tube 4 and the driven tube 71. It transmits rotational power through rotation and triggers the opening and closing function of the filter plate 8 through axial sliding. The handle on the main tube 9 is convenient for the operator to hold and perform rotation, pressing and other operations.

[0038] A top plate 12 and a bottom plate 13 are fixedly installed at the upper and lower ends of the outer side of the central tank 1, respectively. A filter plate 8 is provided between the top plate 12 and the bottom plate 13. A connecting rod 81 is rotatably installed at one end of the filter plate 8. The two ends of the connecting rod 81 are fixedly connected to the top plate 12 and the bottom plate 13, respectively. A pressure plate 82 and a filter plate return spring 83 are also provided inside the central tank 1. The pressure plate 82 is rotatably installed at the lower end of the drive rod 91. The two ends of the filter plate return spring 83 are fixedly connected to the lower surface of the pressure plate 82 and the inner bottom wall of the central tank 1, respectively. A second insertion port 14 is opened at the bottom of the side wall of the central tank 1. A push plate 84 is horizontally slidably installed inside the second insertion port 14. An inner rotating plate 85 and an outer rotating plate 86 are rotatably installed at both ends of the push plate 84, respectively. The inner rotating plate 85 is rotatably connected to the pressure plate 82, and the outer rotating plate 86 is rotatably connected to the filter plate 8.

[0039] As can be seen from the above, during the sampling process, the filter plate 8 remains closed under the action of the filter plate return spring 83, filtering and blocking large particles such as aquatic plants and leaves from entering the internal space of the central tank 1 and the sampling tube 21, thus protecting the internal mechanical parts. When sampling is completed and it is necessary to remove the sampling tube 21 located inside the filter plate 8, the drive rod 91 can be pressed down. The drive rod 91 presses down the pressure plate 82 at its lower end. The pressure plate 82 pushes the push plate 84 to move horizontally outward through the inner rotating plate 85 hinged to it. The push plate 84 then pushes the filter plate 8 to flip outward around the connecting rod 81 through the outer rotating plate 86, thereby exposing the sampling tube 21. The filter plate return spring 83 then assists the pressure plate 82 and the entire mechanism to reset after the downward pressure is removed.

[0040] A rod 92 is installed on the side wall of the main pipe 9, and an annular groove 93 is opened on the side of the drive rod 91. One end of the rod 92 extends into the inside of the main pipe 9 and into the annular groove 93. When the rod 92 abuts against the inner side wall of the annular groove 93, the drive rod 91 can only rotate inside the main pipe 9 and cannot slide up and down.

[0041] As can be seen from the above, when the insertion rod 92 is inserted into the annular groove 93 of the drive rod 91, the circumferential space of the annular groove 93 allows rotation but the axial direction is restricted. Therefore, the drive rod 91 is locked so that it can only rotate but cannot slide axially. This prevents the drive rod 91 from being accidentally pressed down due to misoperation when the drive tube 4 is operated by rotating the drive rod 91 for sampling or sorting, thus opening the filter plate 8 prematurely. When it is necessary to open the filter plate 8, the insertion rod 92 must be pulled out first to release the restriction on the axial movement of the drive rod 91.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wastewater sampling device for environmental monitoring, comprising a central tank (1), a test tube sleeve (2), a sampling tube (21), and a sealing piston (3), characterized in that: A rotating shaft (22) is fixedly installed on the test tube sleeve (2). The rotating shafts (22) are arranged in a ring array on the outside of the central tank (1), and the rotating shafts (22) are rotatably connected to the side wall of the central tank (1). The sampling tube (21) is detachably installed on the inside of the test tube sleeve (2). The sealing piston (3) is located above the test tube sleeve (2), and the sealing piston (3) can slide vertically along the outer side wall of the central tank (1). The interior of the central tank (1) is provided with a drive tube (4), a forward rotating piston lifting mechanism (5), a reverse rotating piston lifting mechanism (6), and a test tube rotation mechanism (7). The drive tube (4) The rotating device is installed inside the central tank (1). When the drive tube (4) rotates forward, the forward piston lifting mechanism (5) controls all the sealing pistons (3) to move upward in sequence and separate from the opening of the sampling tube (21), and re-seals before the next sealing piston (3) separates from the opening of the sampling tube (21). When the drive tube (4) rotates in reverse, the reverse piston lifting mechanism (6) controls all the sealing pistons (3) to move upward simultaneously and separate from the opening of the sampling tube (21), and then the test tube rotating mechanism (7) drives the rotating shaft (22) to rotate, thereby discharging the sample in the sampling tube (21).

2. The wastewater sampling device for environmental monitoring according to claim 1, characterized in that: The sealing piston (3) is provided with a lifting control assembly, which includes a sealing cover (31), a gear frame (32), an intermediate gear (33), and a rack (34). The sealing cover (31) is fixedly installed on the outer wall of the central tank (1), and the lower end of the sealing cover (31) is slidably connected to the sealing piston (3). The outer wall of the central tank (1) is provided with an insertion port (11) that communicates with the inside of the sealing cover (31). The gear frame (32) is fixedly installed on the upper end of the sealing piston (3). The two ends of the intermediate gear (33) are rotatably connected to the two side walls of the sealing cover (31), and the intermediate gear (33) is adapted to mesh with the tooth groove on one side of the inner wall of the gear frame (32). One end of the rack (34) slides horizontally through the insertion port (11) to extend into the inside of the central tank (1), and the rack (34) is adapted to mesh with the intermediate gear (33).

3. The wastewater sampling device for environmental monitoring according to claim 2, characterized in that: The forward-rotating piston lifting mechanism (5) includes a forward-rotating piston lifting turntable (51), a protrusion (52), an abutment block (53), and a piston return spring (54). The forward-rotating piston lifting turntable (51) is rotatably installed inside the central tank (1) and is unidirectionally connected to the drive tube (4). The protrusion (52) is fixedly installed on the outer edge of the forward-rotating piston lifting turntable (51). The abutment block (53) is fixedly installed at one end of the rack (34) extending into the central tank (1) and abuts against the forward-rotating piston lifting turntable (51). The two ends of the piston return spring (54) are respectively connected to one side wall of the abutment block (53) and the inner side wall of the central tank (1). Fixed connection; when the drive tube (4) rotates forward, it drives the forward rotating piston lifting turntable (51) to rotate; when the protrusion (52) contacts the abutment block (53), the piston return spring (54) is compressed and contracts, the abutment block (53) moves into the interior of the sealing cover (31) and pushes the intermediate gear (33) to rotate, so that the sealing piston (3) moves upward and separates from the opening of the sampling tube (21); when the abutment block (53) separates from the protrusion (52), the piston return spring (54) returns and extends, the abutment block (53) pushes the intermediate gear (33) to rotate in the opposite direction, so that the sealing piston (3) moves downward and re-closes the opening of the sampling tube (21); when the drive tube (4) rotates in reverse, the forward rotating piston lifting turntable (51) remains stationary.

4. The wastewater sampling device for environmental monitoring according to claim 2, characterized in that: The reversing piston lifting mechanism (6) includes a reversing piston lifting turntable (61), a drive track groove (62), a driven rod (63), and a turntable return spring (64). The reversing piston lifting turntable (61) is rotatably mounted inside the central tank (1), and the reversing piston lifting turntable (61) is unidirectionally rotatably connected to the drive tube (4). The drive track groove (62) is formed on the reversing piston lifting turntable (61). The driven rod (63) is fixedly mounted on the rack (34), and the driven rod (63) is slidably mounted inside the drive track groove (62). The turntable return spring (64) is... One end of the drive track (62) is connected to the inner wall of the central tank (1), and the other end of the turntable return spring (64) is connected to the reverse piston lifting turntable (61); the drive track groove (62) includes a stationary sliding part (621), a rotating pushing part (622), and a rotating stationary part (623) that are interconnected; the stationary sliding part (621) is a straight groove, and its extension direction is towards the axis of the drive tube (4). When the reverse piston lifting turntable (61) is stationary, the driven rod (63) can slide freely in the stationary sliding part (621); the rotating pushing part (622) is an inclined groove, which is close to the stationary sliding part. (621) The distance between one end and the axis of the drive tube (4) is less than the distance between the other end and the axis of the drive tube (4). When the reverse piston lifting turntable (61) rotates, causing the driven rod (63) to move from the stationary sliding part (621) to the rotating stationary part (623), it pushes the abutment block (53) to move into the interior of the sealing cover (31), pushing the intermediate gear (33) to rotate, causing the sealing piston (3) to move upward and separate from the opening of the sampling tube (21); the rotating stationary part (623) is an arc-shaped groove, and its arc center coincides with the axis of the drive tube (4). When the reverse piston lifting turntable (61) rotates, causing the driven rod (63) to move from the stationary sliding part (621) to the rotating stationary part (623), it pushes the abutment block (53) to move into the interior of the sealing cover (31), pushing the intermediate gear (33) to rotate, causing the sealing piston (3) to move upward and separate from the opening of the sampling tube (21); the rotating stationary part (623) is an arc-shaped groove, and its arc center coincides with the axis of the drive tube (4). When the moving rod (63) slides in the rotating stationary part (623), the abutting block (53) remains stationary; when the drive tube (4) reverses and drives the reverse piston lifting turntable (61) to rotate, the turntable return spring (64) is stretched; when the drive tube (4) rotates forward, the turntable return spring (64) contracts and pulls the reverse piston lifting turntable (61) to rotate and reset, so that the driven rod (63) slides from the rotating stationary part (623) to the interior of the stationary sliding part (621). When the driven rod (63) enters the stationary sliding part (621), the reverse piston lifting turntable (61) remains stationary when the drive tube (4) rotates forward.

5. The wastewater sampling device for environmental monitoring according to claim 4, characterized in that: The test tube rotation mechanism (7) includes a driven tube (71), a misaligned transmission assembly (72), a test tube rotating gear (73), a transmission gear (74), and a gear return spring (75). The driven tube (71) is rotatably mounted on the lower end of the drive tube (4) via the misaligned transmission assembly (72). The test tube rotating gear (73) is rotatably mounted inside the central tank (1), and the test tube rotating gear (73) is unidirectionally rotatably connected to the driven tube (71). The transmission gear (74) is fixedly mounted on one end of the rotating shaft (22) extending into the central tank (1), and the transmission gear (74) is connected to the test tube rotating gear (73). The toothed disc return spring (75) is connected to the inner wall of the central tank (1) and the other end of the toothed disc return spring (75) is connected to the test tube rotating toothed disc (73). When the driven tube (71) reverses and drives the test tube rotating toothed disc (73) to rotate, the toothed disc return spring (75) is stretched. When the driven tube (71) rotates forward, the toothed disc return spring (75) contracts and pulls the test tube rotating toothed disc (73) to rotate and reset, so that the sampling tube (21) returns from the inclined state to the vertical state. When the sampling tube (21) returns to the vertical state, the test tube rotating toothed disc (73) remains stationary when the driven tube (71) rotates forward.

6. The wastewater sampling device for environmental monitoring according to claim 5, characterized in that: The misaligned transmission assembly (72) includes an upper connecting plate (721), a lower connecting plate (722), a slide rod (723), and an arc-shaped misaligned groove (724). The upper connecting plate (721) is fixedly installed at the lower end of the drive tube (4), the lower connecting plate (722) is fixedly installed at the upper end of the driven tube (71), the slide rod (723) is fixedly installed on the lower surface of the upper connecting plate (721), and the arc-shaped misaligned groove (724) is opened on the lower connecting plate (722), and the arc-shaped misaligned groove (724) is slidably connected to the slide rod (723). When the drive tube (4) reverses, the slide rod (723) rotates in the arc-shaped misaligned groove (724). Only when the slide rod (723) rotates to abut against one end of the arc-shaped misaligned groove (724) can the lower connecting plate (722) be pushed to rotate.

7. A wastewater sampling device for environmental monitoring according to claim 5, characterized in that: A main pipe (9) is fixedly installed on the upper end of the central tank (1). A drive rod (91) is provided inside the main pipe (9). The drive rod (91) can rotate and slide vertically inside the main pipe (9). The lower end of the drive rod (91) extends through the upper end of the central tank (1) and into the interior of the central tank (1). The drive rod (91) is slidably connected to the inner wall of the drive tube (4). The lower end of the drive rod (91) also extends into the interior of the driven tube (71). The drive rod (91) can rotate and slide vertically inside the driven tube (71). A handle is fixedly installed on the main pipe (9).

8. A wastewater sampling device for environmental monitoring according to claim 7, characterized in that: A top plate (12) and a bottom plate (13) are fixedly installed on the upper and lower ends of the outer side of the central tank (1), respectively. A filter plate (8) is provided between the top plate (12) and the bottom plate (13). A connecting rod (81) is rotatably installed on one end of the filter plate (8). The two ends of the connecting rod (81) are fixedly connected to the top plate (12) and the bottom plate (13), respectively. A pressure plate (82) and a filter plate return spring (83) are also provided inside the central tank (1). The pressure plate (82) is rotatably installed on the drive rod (91). At the lower end, the two ends of the filter plate reset spring (83) are fixedly connected to the lower surface of the pressure plate (82) and the inner bottom wall of the central tank (1), respectively. The bottom of the side wall of the central tank (1) is provided with a second insertion port (14). A push plate (84) is horizontally slidably installed inside the second insertion port (14). An inner rotating plate (85) and an outer rotating plate (86) are rotatably installed at both ends of the push plate (84). The inner rotating plate (85) is rotatably connected to the pressure plate (82), and the outer rotating plate (86) is rotatably connected to the filter plate (8).

9. A wastewater sampling device for environmental monitoring according to claim 8, characterized in that: A plug rod (92) is installed on the side wall of the main tube (9), and an annular groove (93) is opened on the side of the drive rod (91). One end of the plug rod (92) extends into the inside of the main tube (9) and into the annular groove (93). When the plug rod (92) abuts against the inner side wall of the annular groove (93), the drive rod (91) can only rotate inside the main tube (9) and cannot slide up and down.

Images