Quantitative sampling device for domestic sewage detection

Abstract

The utility model discloses a quantitative sampling device for detection of domestic sewage, which comprises a base, a piston cylinder, a piston rod, a piston rod, a piston rod, a piston rod and a piston rod, the sampling bottle seat is positioned on one side above the sampling box; the sampling piston is positioned in the piston cylinder; the connecting rod convex shaft is positioned below the piston cylinder; the driving shaft is mounted on the side surface of the sampling box; and the sampling bottle mechanism is movably embedded in the sampling bottle seat. According to the domestic sewage sampling device, the connecting rod convex shaft can continuously drive the sampling piston to move up and down in a reciprocating manner by utilizing the reciprocating swing of the driving handle, so that the domestic sewage can be sampled, the domestic sewage can be quickly injected into the sampling bottle mechanism for storage by utilizing the quick clamping connection of the sampling bottle seat and the sampling mechanism, and meanwhile, the sampling effect is good. By utilizing the single driving of the driving handle, the sample can be quantitatively sampled, and the use of sampling personnel is effectively facilitated.

Description

Technical Field

[0001] The utility model relates to the field of sewage detection related equipment, in particular to a quantitative sampling device for domestic sewage detection. Background Art

[0002] Domestic sewage is wastewater discharged from residents' daily lives. It mainly comes from residential buildings and public buildings, such as residences, offices, schools, hospitals, shops, public places and toilets in industrial enterprises. The pollutants contained in domestic sewage are mainly organic matter and a large number of pathogenic microorganisms. The organic matter in domestic sewage is extremely unstable and easily decomposes to produce a foul odor. Bacteria and pathogens multiply in large numbers using the organic matter in domestic sewage as nutrition, which can lead to the spread of infectious diseases. In the process of sewage testing, a sampling device is needed to extract water samples.

[0003] However, the existing sampling devices are not capable of quantitative sampling when sampling domestic sewage, which requires staff to perform multiple samplings, reducing efficiency and increasing the risk of sampling. At the same time, after the sampling device is used, a large amount of sample still remains inside it, and the long-term retention and sedimentation of the sample will seriously affect the accuracy of the sample. Utility Model Content

[0004] To solve the problems raised in the above background technology, the utility model provides a quantitative sampling device for domestic sewage detection, which can solve the problem of the inability to quantitatively sample domestic sewage in the prior art, and solve the problem of the sample remaining in the sampling mechanism after sampling, causing the sampling mechanism to be contaminated.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is a domestic sewage detection quantitative sampling device, comprising a base, a sampling box is arranged on the top of the base, and also includes:

[0006] The piston cylinder is located above the inside of the sampling box, an external pipe is installed on one side of the upper part, an external valve is installed on the external pipe, the external valve is located outside the sampling box, a sample outlet pipe is installed on the other side of the upper part, a parallel pipe is installed below the side surface of one side, and a check valve and a discharge valve are installed on two parallel branches of the parallel pipe respectively;

[0007] The sampling bottle seat is located on one side above the sampling box and is fixedly connected to the sample outlet pipe. A one-way valve identical to that on the parallel pipe is arranged inside the sampling bottle seat. The one-way valve is installed on the sample outlet pipe. A coupling seat is arranged at the center of the coupling seat. The sample outlet pipe is located at the center of the coupling seat.

[0008] The sampling piston is located in the piston cylinder, a piston connecting rod is installed on its lower surface, and a sampling hose is installed on one side of its upper surface, and the sampling hose is fixedly connected to the outlet of the parallel pipe;

[0009] The connecting rod cam is located below the piston cylinder, one end of which is connected to the inner surface of the sampling box through a bearing, and the other end of which is connected to the lower surface of the sampling box through a one-way bearing and a bearing seat, and is equipped with a pinion gear. The piston connecting rod and the movable sleeve are mounted on the connecting rod cam;

[0010] A driving shaft is mounted on the side surface of the sampling box and connected through a bearing, a driving handle is mounted on one end of the driving shaft, the driving handle is located outside the sampling box, and a fan-shaped plate is mounted on the other end of the driving shaft, the fan-shaped plate is located inside the sampling box, and an arc-shaped gear track is mounted on the outer end of the fan-shaped plate;

[0011] The large gear is located on one side of the sector plate and meshes with the arc-shaped gear track and the small gear, and is installed on the bearing seat of the one-way bearing through a short shaft and a bearing;

[0012] The sampling bottle mechanism is movably embedded in the sampling bottle seat, and includes:

[0013] The bottom of the bottle is movably embedded in the base of the sampling bottle, and a coupling groove is opened at the center of the lower surface thereof, and the coupling groove is movably mounted on the coupling seat, and a water injection groove is arranged at the center of the inner part thereof, and a concave rubber seat is arranged inside the water injection groove, and a compression spring is arranged inside the concave rubber seat, and a water injection hose is installed on the lower surface of the water injection groove, and the water injection hose is movably inserted in the sample outlet pipe, and the water injection groove is connected to the upper surface of the bottle bottom through a plurality of water injection holes, and the water injection holes are evenly distributed;

[0014] The bottle body is threaded on the bottom of the bottle and is made of transparent glass;

[0015] The bottle cap is threadedly mounted on the bottle mouth of the bottle body and is sealed and connected.

[0016] As a quantitative sampling device for domestic sewage detection of the utility model, the one-way valve on the parallel pipe is located in the sampling box, and the discharge valve on the parallel pipe is located outside the sampling box.

[0017] As a quantitative sampling device for domestic sewage detection of the utility model, the length of the sampling hose is greater than the height difference of the sampling piston moving up and down.

[0018] As a domestic sewage detection quantitative sampling device of the utility model, a limit block is arranged on the side surface of the sampling box, the limit block is located on both sides of the driving handle, and the rotation angle of the driving handle is controlled within 90°.

[0019] As a domestic sewage detection quantitative sampling device of the utility model, after the driving handle is rotated to the maximum angle, the pinion drives the connecting rod cam to rotate 360°.

[0020] As a quantitative sampling device for domestic sewage detection of the utility model, the volume of the moving track of the sampling piston is smaller than the volume of the sampling bottle mechanism.

[0021] As a quantitative sampling device for domestic sewage detection of the utility model, a torque spring is mounted on the driving shaft, and two ends of the torque spring are respectively fixed on the driving handle and the sampling box.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. By using the reciprocating swing of the driving handle, the connecting rod cam can continuously drive the sampling piston to move up and down, so that domestic sewage can be sampled. Then, by using the quick clamping connection between the sampling bottle seat and the sampling mechanism, domestic sewage can be quickly injected into the sampling bottle mechanism for storage. At the same time, by using a single drive of the driving handle, quantitative sampling can be performed, which effectively facilitates the use of sampling personnel.

[0024] 2. This device does not contain any electrical mechanism, which can effectively reduce the cost of the device. At the same time, the device has a simple structure and low weight, making it more convenient for samplers to carry.

[0025] 3. By opening and closing the external valve and the discharge valve, the connection between the piston cylinder and the outside world can be controlled, so that the residual sample can be quickly discharged from the piston cylinder by its own gravity, avoiding the sample from being retained in the piston cylinder for a long time, causing contamination of the piston cylinder and affecting the accuracy of sample sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a domestic sewage detection quantitative sampling device described in the utility model;

[0027] Figure 2 It is a schematic diagram of the fan-shaped plate of the utility model;

[0028] Figure 3 It is a schematic diagram of the sampling bottle mechanism of the utility model;

[0029] In the figure:

[0030] 1. Base.

[0031] 2. Sampling box; 21. Piston cylinder; 211. External pipe; 212. External valve; 213. Sample outlet pipe; 214. Parallel pipe; 215. One-way valve; 216. Discharge valve; 22. Sampling bottle holder; 221. Coupling holder; 23. Sampling piston; 231. Piston connecting rod; 232. Sampling hose; 24. Connecting rod cam; 241. One-way bearing; 242. Small gear; 25. Drive shaft; 251. Drive handle; 252. Fan plate; 253. Arc gear; 254. Torque spring; 26. Large gear.

[0032] 3. Sampling bottle mechanism; 31. Bottle bottom; 311. Coupling slot; 312. Water injection slot; 313. Concave rubber seat; 314. Compression spring; 315. Water injection hose; 316. Water injection hole; 32. Bottle body; 33. Bottle cap. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The utility model provides a technical solution, such as Figure 1-Figure 3 As shown; a quantitative sampling device for domestic sewage detection, including a base 1, a sampling box 2 is arranged above the base 1, and also includes: a piston cylinder 21, which is located above the inside of the sampling box 2, an external pipe 211 is installed on the upper side of the piston cylinder 21, an external valve 212 is installed on the external pipe 211, the external valve 212 is located outside the sampling box 2, a sample outlet pipe 213 is installed on the other side of the piston cylinder 21, a parallel pipe 214 is installed below the side surface of one side of the piston cylinder 21, a one-way valve 215 and a discharge valve 216 are respectively installed on the two parallel branches of the parallel pipe 214; a sampling bottle seat 22, which is located on the upper side of the sampling box 2 and is fixedly connected to the sample outlet pipe 213, a one-way valve 215 identical to that on the parallel pipe 214 is arranged inside the piston cylinder 21, the one-way valve 215 is installed on the sample outlet pipe 213, a coupling seat 221 is arranged at the center of the inner center of the piston cylinder 211, and the sample outlet pipe 213 is located at the center of the coupling seat 221.

[0035] In the embodiment of the utility model, by utilizing the setting of the external tube 211 and the external valve 212, on the one hand, the external valve 212 can be opened to connect the piston cylinder 21 with the outside world, thereby allowing the sample inside the piston cylinder 21 to be discharged through itself; on the other hand, it can be connected to the flushing pipe, and then the piston cylinder 21 can be flushed with clean water to ensure the cleanliness of the piston cylinder 21.

[0036] In the embodiment of the utility model, the design of the parallel pipe 214 is utilized, and a one-way valve 215 and a discharge valve 216 are respectively provided on the two parallel branches. On the one hand, the piston cylinder 21 can utilize the movement of the sampling piston 23 to sample domestic sewage. On the other hand, the residual domestic sewage can be quickly discharged from the piston cylinder 21 by opening the discharge valve 216, thereby preventing the long-term retention of domestic sewage from contaminating the piston cylinder 21.

[0037] In the embodiment of the utility model, the sampling bottle seat 22 is made of plastic material, which can reduce the weight of the device and can be quickly connected to the sampling bottle mechanism 3, so that domestic sewage can be quantitatively injected into the sampling mechanism 3 for storage; the setting of the coupling seat 221 can ensure that the sampling bottle mechanism 3 can be connected quickly and tightly.

[0038] The sampling piston 23 is located in the piston cylinder 21 , and a piston connecting rod 231 is installed on its lower surface, and a sampling hose 232 is installed on one side of its upper surface. The sampling hose 232 is fixedly connected to the outlet of the parallel pipe 214 .

[0039] In the embodiment of the utility model, the sampling hose 232 is installed on the sampling piston 23 and moves up and down synchronously with the sampling piston 23, so that the domestic sewage retained in the piston cylinder 21 can be quickly drained and the retention and precipitation of domestic sewage can be avoided.

[0040] The connecting rod cam 24 is located below the piston cylinder 21, one end of which is connected to the inner surface of the sampling box 2 through a bearing, and the other end is connected to the lower surface of the sampling box 2 through a one-way bearing 241 and a bearing seat, and a pinion 242 is installed. The piston connecting rod 231 and the movable sleeve are mounted on the connecting rod cam 24.

[0041] In the embodiment of the utility model, the one-way bearing 241 is provided to enable the pinion 242 to drive the connecting rod cam 24 to rotate in one direction, thereby preventing the connecting rod cam 24 from reciprocating when the driving handle 251 shakes up and down, thereby ensuring the smooth movement of the sampling piston 23.

[0042] The driving shaft 25 is installed on the side surface of the sampling box 2 and is connected through a bearing. A driving handle 251 is installed on one end of the driving shaft 25, and the driving handle 251 is located outside the sampling box 2. A fan-shaped plate 252 is installed on the other end of the driving shaft 25, and the fan-shaped plate 252 is located inside the sampling box 2. An arc-shaped gear 253 is installed on the outer end of the fan-shaped plate 252; the large gear 26 is located on one side of the fan-shaped plate 252, and is meshed with the arc-shaped gear 253 and the small gear 242, and is installed on the bearing seat of the one-way bearing 241 through a short shaft and a bearing.

[0043] In the embodiment of the utility model, the driving handle 251 is rotated up and down to reciprocate, so that the driving shaft 25 drives the sector plate 252 to move back and forth, and the arc-shaped rack 253 drives the small gear 242 to rotate by meshing with the large gear 26.

[0044] In the embodiment of the utility model, when the driving handle 251 is in a free state, the sampling piston 23 is at the top of the piston cylinder 21. At this time, the sampling piston 23 is in a pressure-free state. After the driving handle 251 rotates a certain angle, the sampling piston 23 moves from the uppermost end to the lowermost end, and then moves to the uppermost end again, thereby ensuring that the sampling piston 23 will not shake up and down when the driving handle 251 is reset.

[0045] The sampling bottle mechanism 3 is movably embedded in the sampling bottle seat 22, and includes: a bottle bottom 31, which is movably embedded in the sampling bottle base 1, and a coupling groove 311 is opened at the center of its lower surface, and the coupling groove 311 is movably sleeved on the coupling seat 221, and a water injection groove 312 is arranged at the center of its inner part, and a concave rubber seat 313 is arranged inside the water injection groove 312, and a compression spring 314 is arranged inside the concave rubber seat 313, and a water injection hose 315 is installed on the lower surface of the water injection groove 312, and the water injection hose 315 is movably inserted in the sample outlet pipe 213, and the water injection groove 312 is connected to the upper surface of the bottle bottom 31 through a plurality of water injection holes 316, and the water injection holes 316 are evenly distributed; a bottle body 32, which is threadedly installed on the bottle bottom 31 and is made of transparent glass; a bottle cap 33, which is threadedly installed on the bottle mouth of the bottle body 32 and is sealed.

[0046] In the embodiment of the utility model, the sampling device composed of the bottle bottom 31, the bottle body 32 and the bottle cover 33 can be quickly disassembled, thereby facilitating the cleaning of the sample and ensuring the accuracy of sampling.

[0047] In the embodiment of the utility model, the concave rubber seat 313 is provided in the water injection groove 312, and the elastic force of the compression spring 314 is used to perform sealing, so that leakage of the sample in the sampling bottle can be avoided, thereby ensuring the safety of sample storage.

[0048] In the embodiment of the utility model, the water injection hole 316 is opened at the lower end of the side surface of the water injection groove 312, so that the concave rubber seat 313 can seal the water injection hose 315 and the water injection hole 316 at the same time, which can ensure the smooth injection of the domestic sewage sample and avoid its leakage.

[0049] In the embodiment of the utility model, the water injection hose 315 can be inserted into the sample outlet tube 213 to quickly complete the docking and ensure sealing, thereby ensuring airtightness during sample injection.

[0050] In the utility model, the one-way valve 215 on the parallel pipe 214 is located inside the sampling box 2, and the discharge valve 216 on the parallel pipe 214 is located outside the sampling box 2; the staff can conveniently open and close the discharge valve 216.

[0051] In the present invention, the length of the sampling hose 232 is greater than the height difference of the sampling piston 23 when it moves up and down, so as to avoid the problem that the sampling hose 232 is not long enough and is broken when the sampling piston 23 rises, thereby ensuring the smooth operation of the device.

[0052] In the utility model, a limit stopper is arranged on the side surface of the sampling box 2, and the limit stopper is located on both sides of the driving handle 251, and the rotation angle of the driving handle 251 is controlled within 90°; it can facilitate the staff's accurate control and ensure the quantitative sampling of the sample.

[0053] In the utility model, after the driving handle 251 rotates to the maximum angle, the pinion 242 drives the connecting rod cam 24 to rotate 360°; it can be ensured that after the driving handle 251 rotates once, the sampling piston 23 can reciprocate up and down for one cycle, and the control is more convenient and accurate.

[0054] In the utility model, the volume of the moving track of the sampling piston 23 is smaller than the volume of the sampling bottle mechanism 3 , thereby ensuring quantitative sampling and storage of the sample and preventing the sample from filling up the sampling mechanism 3 .

[0055] In the utility model, a torque spring 254 is mounted on the driving shaft 25, and the two ends of the torque spring 254 are respectively fixed on the driving handle 251 and the sampling box 2; the elasticity of the torque spring 254 can be utilized to enable the driving handle 251 to be quickly reset after being rotated, making it more convenient for the staff to operate.

[0056] When the utility model is used specifically, the staff installs the hose at the inlet end of the parallel pipe 214 and inserts the hose into the domestic sewage, and then closes the external valve 212 and the discharge valve 216. At this time, the piston cylinder 21 is isolated from the outside air, and through the action of the one-way valve 215, when the sampling piston 23 moves up and down, the domestic sewage can be injected from the hose and the parallel pipe 214 into the sampling hose 232, and then enter the piston cylinder 21, and discharged through the sample outlet pipe 213;

[0057] The staff takes out the sampling mechanism 3 and installs it on the sampling bottle holder 22. The sampling mechanism 3 is fixed on the sampling holder 22 by using the tight connection. At the same time, the water injection hose 315 is inserted into the sample outlet pipe 213. The staff also removes the bottle cap 33 from the bottle body 32.

[0058] Then, the staff can rotate the driving handle 251, and through the restriction of the limit block, the driving handle 251 can be rotated at a fixed angle, thereby driving the driving shaft 25 to rotate at a fixed angle, and through the fan-shaped plate 252, the arc gear rail 253 can be driven to move, and the large gear 26 can be driven to drive the small gear 242 to rotate 360°, and then the connecting rod cam 24 can be used to drive the piston connecting rod 231 to move, so that the sampling piston 23 can reciprocate from top to bottom and then from bottom to top for a cycle, so that the piston cylinder 21 can start to extract domestic sewage;

[0059] As the driving handle 251 rotates up and down reciprocatingly, the sampling piston 23 moves up and down reciprocatingly, so that the domestic sewage is gradually drawn into the piston cylinder 21 and gradually fills the piston cylinder 21. Then, as the sampling piston 23 moves upward, the domestic sewage is discharged into the water injection hose 315 through the sample outlet pipe 213, and the concave rubber seat 313 is pushed upward by water pressure to expose the water injection hole 316, so that the domestic sewage is injected into the bottle body 32 through the water injection hole 315.

[0060] When domestic sewage begins to be injected into the bottle body 32, the staff rotates the driving handle 251 to complete the current cycle, then removes the sampling bottle mechanism 3, pours out the sample, and then installs the sampling bottle mechanism 3 into the sampling bottle seat 22. Then the staff controls the driving handle 251 to rotate downward for one cycle again, and then uses the sampling piston 23 to move one cycle to allow domestic sewage to be quantitatively injected into the sampling mechanism 3. Then the bottle cap 33 can be installed on the bottle body 32, and the sampling bottle mechanism 3 can be removed.

[0061] After the sampling is completed, when it is necessary to discharge domestic sewage, the staff will open the discharge valve 216 and open the external valve 212 at the same time to connect the piston cylinder 21 with the outside world, so that the domestic sewage can be completely discharged from the piston cylinder 21 by its own gravity, and then the discharge valve 216 and the external valve 212 can be closed.

[0062] When the device needs to be cleaned, the discharge valve 216 and the external valve 212 are opened, and the external cleaning water pipe is connected to the external pipe 212, so that the device can be flushed with external clean water.

[0063] When the device is in use, since the sampling locations are mostly located outdoors and in relatively remote locations, the device adopts a non-electricity structure, which can effectively avoid the problem of electricity difficulties. At the same time, the device has a simple structure and is easy to operate. While quantitatively extracting domestic sewage, it can also quickly drain the domestic sewage remaining in the device to ensure the accuracy of the samples during multiple samplings.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quantitative sampling device for domestic sewage detection, comprising a base, on which a sampling box is arranged, characterized in that: Also includes: The piston cylinder is located above the inside of the sampling box, an external pipe is installed on one side of the upper part, an external valve is installed on the external pipe, the external valve is located outside the sampling box, a sample outlet pipe is installed on the other side of the upper part, a parallel pipe is installed below the side surface of one side, and a check valve and a discharge valve are installed on two parallel branches of the parallel pipe respectively; The sampling bottle seat is located on one side above the sampling box and is fixedly connected to the sample outlet pipe. A one-way valve identical to that on the parallel pipe is arranged inside the sampling bottle seat. The one-way valve is installed on the sample outlet pipe. A coupling seat is arranged at the center of the coupling seat. The sample outlet pipe is located at the center of the coupling seat. The sampling piston is located in the piston cylinder, a piston connecting rod is installed on its lower surface, and a sampling hose is installed on one side of its upper surface, and the sampling hose is fixedly connected to the outlet of the parallel pipe; The connecting rod cam is located below the piston cylinder, one end of which is connected to the inner surface of the sampling box through a bearing, and the other end of which is connected to the lower surface of the sampling box through a one-way bearing and a bearing seat, and is equipped with a pinion gear. The piston connecting rod and the movable sleeve are mounted on the connecting rod cam; A driving shaft is mounted on the side surface of the sampling box and connected through a bearing, a driving handle is mounted on one end of the driving shaft, the driving handle is located outside the sampling box, and a fan-shaped plate is mounted on the other end of the driving shaft, the fan-shaped plate is located inside the sampling box, and an arc-shaped gear track is mounted on the outer end of the fan-shaped plate; The large gear is located on one side of the sector plate and meshes with the arc-shaped gear track and the small gear, and is installed on the bearing seat of the one-way bearing through a short shaft and a bearing; The sampling bottle mechanism is movably embedded in the sampling bottle seat, and includes: The bottom of the bottle is movably embedded in the base of the sampling bottle, and a coupling groove is opened at the center of the lower surface thereof, and the coupling groove is movably mounted on the coupling seat, and a water injection groove is arranged at the center of the inner part thereof, and a concave rubber seat is arranged inside the water injection groove, and a compression spring is arranged inside the concave rubber seat, and a water injection hose is installed on the lower surface of the water injection groove, and the water injection hose is movably inserted in the sample outlet pipe, and the water injection groove is connected to the upper surface of the bottle bottom through a plurality of water injection holes, and the water injection holes are evenly distributed; The bottle body is threaded on the bottom of the bottle and is made of transparent glass; The bottle cap is threadedly mounted on the bottle mouth of the bottle body and is sealed and connected.

2. A domestic sewage detection quantitative sampling device according to claim 1, characterized in that: The one-way valve on the parallel pipe is located inside the sampling box, and the discharge valve on the parallel pipe is located outside the sampling box.

3. A domestic sewage detection quantitative sampling device according to claim 1, characterized in that: The length of the sampling hose is greater than the height difference of the sampling piston moving up and down.

4. A domestic sewage detection quantitative sampling device according to claim 1, characterized in that: A limit stopper is arranged on the side surface of the sampling box, and the limit stopper is located on both sides of the driving handle, and the rotation angle of the driving handle is controlled within 90°.

5. A domestic sewage detection quantitative sampling device according to claim 4, characterized in that: After the driving handle rotates to the maximum angle, the pinion drives the connecting rod cam to rotate 360°.

6. A domestic sewage detection quantitative sampling device according to claim 1, characterized in that: The volume of the moving track of the sampling piston is smaller than the volume of the sampling bottle mechanism.

7. A domestic sewage detection quantitative sampling device according to claim 1, characterized in that: A torque spring is sleeved on the driving shaft, and two ends of the torque spring are respectively fixed on the driving handle and the sampling box.

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