An environmental protection soil heavy metal pollution detection device

Abstract

This invention relates to the field of environmental monitoring and analysis technology, specifically to an environmental protection soil heavy metal pollution detection device. The device includes a frame, on which a digestion tank is rotatably mounted. A rotating mechanism for driving the digestion tank's rotation is also mounted on the frame. The rotating mechanism includes a main drive shaft rotatably mounted on the frame, which is connected to the digestion tank via a first linkage mechanism. When the main drive shaft rotates, it drives the digestion tank to rotate synchronously. Two air pumping mechanisms are mounted on the frame, and these mechanisms are connected to the main drive shaft via a second linkage mechanism. During the rotation of the main drive shaft, the second linkage mechanism periodically drives the two air pumping mechanisms to operate alternately. This invention enables efficient, uniform, safe, and automated sample pretreatment during soil digestion. In particular, it enhances the mixing effect of soil and strong acid without the need for internal mechanical stirring, and simultaneously collects and renders harmless the hazardous waste gas generated during digestion.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring and analysis technology, specifically to an environmental protection soil heavy metal pollution detection device. Background Technology

[0002] Soil heavy metal pollution detection is a crucial part of environmental monitoring, and the accuracy of the results highly depends on the quality of sample pretreatment. Microwave digestion technology, as the current mainstream sample pretreatment method, involves placing soil samples with mixed strong acids such as nitric acid, hydrochloric acid, and hydrofluoric acid in a sealed digestion vessel and using microwave heating to fully dissolve the heavy metal components. It has the advantages of being fast, efficient, and low-pollution.

[0003] However, existing microwave digestion technologies and equipment still have several technical shortcomings in practical applications, mainly in terms of sample mixing uniformity and operational safety. Firstly, to ensure complete digestion, the sample needs to be in full contact with the strong acid reagent and react uniformly. Currently, most microwave digestion equipment lacks online mixing capabilities, relying primarily on natural convection of the solution, resulting in low mixing efficiency. This is especially true for viscous soil samples or those containing poorly soluble components, which are prone to digestion dead zones, leading to incomplete local digestion and ultimately affecting the accuracy and reliability of the test results. Although some high-end equipment has attempted to introduce mechanical stirring devices, the strong acid... The harsh environment of high temperature and high pressure places extremely high demands on the corrosion resistance of the stirring components and the dynamic sealing structure, resulting in high equipment manufacturing costs, reduced reliability, and the risk of leakage due to seal failure, making it difficult to widely apply in conventional laboratories. Secondly, there are serious safety hazards in operation after digestion. After digestion, a large amount of strong acid mist, such as nitric acid mist and hydrofluoric acid gas, generated by the vaporization of acid liquid accumulates in the digestion tank. These are highly corrosive and toxic. The moment the digestion tank is opened, these high-pressure mists will escape instantly, which not only directly endangers the health of operators, but also corrodes precision laboratory instruments and causes secondary pollution in the long term.

[0004] Currently, laboratories generally lack effective means for the immediate treatment of waste gas from this process, and usually rely solely on fume hoods for dilution and emission, which fails to fundamentally solve the problem of toxic waste gas purification and poses a continuous threat to the laboratory environment and personnel safety. Therefore, we provide an environmental protection soil heavy metal pollution detection device to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide an environmental protection soil heavy metal pollution detection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An environmental protection soil heavy metal pollution detection device includes a frame, a digestion tank rotatably mounted on the frame, and a rotating mechanism for driving the digestion tank to rotate on the frame. The rotating mechanism includes a main drive shaft rotatably mounted on the frame. The main drive shaft and the digestion tank are connected by a first linkage mechanism. When the main drive shaft rotates, it will drive the digestion tank to rotate synchronously.

[0008] The frame is equipped with two air pumping mechanisms. The two air pumping mechanisms are connected to the main drive shaft through a second linkage mechanism. During the rotation of the main drive shaft, the second linkage mechanism periodically drives the two air pumping mechanisms to operate alternately.

[0009] During each working cycle, when one of the gas pumping mechanisms pumps gas into the digestion tank to create positive pressure, the other gas pumping mechanism is in a non-operating state; when the other gas pumping mechanism draws gas from the digestion tank to create negative pressure, the first gas pumping mechanism is in a non-operating state.

[0010] An environmental protection soil heavy metal pollution detection device as described above: a motor is fixed on the frame, and the output end of the motor is connected to the main drive shaft through a coupling to drive the main drive shaft to rotate.

[0011] An environmental protection soil heavy metal pollution detection device as described above: The first linkage mechanism includes a first transmission shaft rotatably mounted on a frame. The first transmission shaft and the main drive shaft are connected by a worm gear mechanism. When the main drive shaft rotates, it drives the first transmission shaft to rotate synchronously. A hollow shaft is rotatably mounted on the frame. The hollow shaft and the first transmission shaft are connected by a first gear mechanism. When the first transmission shaft rotates, it drives the hollow shaft to rotate synchronously. The bottom end of the digestion tank is rotatably connected to the frame through a bearing, and the top end is fixedly connected to the hollow shaft.

[0012] An environmental protection soil heavy metal pollution detection device as described above: the worm gear mechanism includes a worm fixed on the main drive shaft and a worm wheel fixed on the first transmission shaft, wherein the worm meshes with the worm wheel;

[0013] The first gear mechanism includes a driving gear fixed on a first transmission shaft and rotatably mounted on a frame, and a driven gear fixed on a hollow shaft and rotatably mounted on a frame, wherein the driving gear meshes with the driven gear.

[0014] An environmental protection soil heavy metal pollution detection device as described above: the pumping mechanism includes a barrel fixed on a frame, a piston rod movably inserted into the barrel, a piston fixed on the piston rod and movably engaged in the barrel, a second gas pipe and a first gas pipe communicating with the inside of the digestion tank fixed on the barrel, one-way valves respectively installed on the first gas pipe and the second gas pipe, a connector rotatably installed at the top of the hollow shaft, and the end of the first gas pipe fixed to the connector and communicating with the inside of the hollow shaft.

[0015] An environmental protection soil heavy metal pollution detection device as described above: The second linkage mechanism includes a secondary drive shaft rotatably mounted on the frame. The primary drive shaft and the secondary drive shaft are connected via a pulley mechanism. When the primary drive shaft rotates, it drives the secondary drive shaft to rotate synchronously. Two crankshafts are rotatably mounted on the frame. The two crankshafts are connected to the primary drive shaft and the secondary drive shaft respectively via an intermittent mechanism. When the primary drive shaft and the secondary drive shaft rotate, they periodically drive the two crankshafts to rotate alternately. In each working cycle, when one crankshaft rotates, the other crankshaft does not rotate; when the other crankshaft rotates, the first crankshaft does not rotate.

[0016] The two crankshafts are connected to the piston rods via crank-connecting rod mechanisms. When the crankshafts rotate, they drive the piston rods to move up and down reciprocally.

[0017] An environmental protection soil heavy metal pollution detection device as described above: the pulley mechanism includes an active toothed pulley fixed on the main drive shaft and a driven toothed pulley fixed on the auxiliary drive shaft, and the active toothed pulley and the driven toothed pulley are driven by a toothed belt.

[0018] An environmental protection soil heavy metal pollution detection device as described above: The intermittent mechanism includes a turntable fixed on a main drive shaft and a secondary drive shaft respectively; a gear ring and a drive disk are rotatably mounted on the frame; a swing arm is fixed on the drive disk; a slot is provided on the swing arm; a pin is fixed on the turntable and movably engaged in the slot; a ratchet groove is provided on the inner wall of the gear ring; a ratchet tooth is hinged on the drive disk and movably engaged in the ratchet groove; an elastic paddle is provided on the drive disk; one end of the elastic paddle is fixed to the drive disk, and the other end movably fits against one edge of the ratchet tooth; a limit groove is fixed on the frame; a limit tooth that meshes with the gear ring is movably engaged in the limit groove; a spring is provided in the limit groove; one end of the spring is fixed to the limit tooth, and the other end is connected to the inner wall of the limit groove; a transmission gear is fixed on the crankshaft and meshes with the gear ring.

[0019] An environmental protection soil heavy metal pollution detection device as described above: the crank-connecting rod mechanism includes a crank disc fixed on a crankshaft, a connecting rod is provided between the crank disc and the piston rod, and the two ends of the connecting rod are respectively hinged to the crank disc and the piston rod.

[0020] An environmental protection soil heavy metal pollution detection device as described above: a waste gas absorption box is fixed on the frame, and the second gas pipe of one of the pumping mechanisms extends into the interior of the waste gas absorption box.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The digestion tank of the present invention rotates at a constant speed under the drive of the main drive shaft and the first linkage mechanism, generating centrifugal force and tangential flow. At the same time, the main drive shaft and the second linkage mechanism periodically drive two pumping mechanisms to operate alternately, pumping air into the tank to form positive pressure or drawing air from the tank to form negative pressure, causing the liquid inside the digestion tank to form violent up-and-down rolling and convection, forming a continuous and strong vortex and shear force inside the tank, which greatly enhances the mass and heat transfer process inside the digestion tank, ensuring the thoroughness of digestion. At the same time, it abandons the traditional method of built-in mechanical stirring structure. The mixing function is realized by the rotation of the digestion tank and the external pneumatic mechanism. All power components do not come into direct contact with the strong acid and high temperature medium inside the tank, perfectly avoiding the damage of the harsh corrosive environment to the precision moving parts, greatly reducing the manufacturing and maintenance costs of the equipment, and fundamentally improving the reliability and durability of the device in long-term operation.

[0022] In addition, by integrating the waste gas treatment function into the system, during the digestion process, one of the gas pumping mechanisms continuously transports the high-risk waste gas rich in strong acid mist generated in the digestion tank to the waste gas absorption box for neutralization and purification through the tank body and the second gas pipe connected to it. This ensures that the waste gas is collected and treated as soon as it is generated, fundamentally avoiding the environmental pollution caused by the escape of toxic and harmful gases in the laboratory, and greatly improving the operational safety of laboratory personnel. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an environmental protection soil heavy metal pollution detection device.

[0024] Figure 2 In order to be in Figure 1 This is a partial structural diagram after the protective plates on the frame have been removed.

[0025] Figure 3 In order to be in Figure 2 This is a partial structural diagram after the frame has been removed.

[0026] Figure 4 In order to be in Figure 3 Based on this, only the structural diagrams of the gear mechanism and the digestion tank are retained.

[0027] Figure 5 This is a schematic diagram of the gear mechanism, worm gear, and part of the motor structure.

[0028] Figure 6 In order to be in Figure 3 This is a schematic diagram of the structure after removing the worm gear, gear mechanism, and motor.

[0029] Figure 7 In order to be in Figure 6 Based on this, only one set of linkage mechanisms is retained in the partial structural diagram.

[0030] Figure 8 This is a partial structural diagram of the pump mechanism.

[0031] Figure 9 This is a partial structural diagram of the intermittent mechanism.

[0032] Figure 10 for Figure 9 The diagram shows the structure of the gear ring, rocker arm, and turntable.

[0033] In the diagram: 1. Frame; 2. Digestion tank; 3. Feed hopper; 4. Discharge valve; 5. Main drive shaft; 6. Motor; 7. First transmission shaft; 8. Worm gear; 9. Worm wheel; 10. Hollow shaft; 11. Drive gear; 12. Driven gear; 13. Barrel body; 14. Piston rod; 15. Piston; 16. First air pipe; 17. Second air pipe; 18. Crankshaft; 19. Crank disc; 20. Connecting rod; 21. 21. Secondary drive shaft; 22. Driving toothed pulley; 23. Driven toothed pulley; 24. Toothed belt; 25. Gear ring; 26. Transmission gear; 27. Drive disc; 28. Racket groove; 29. ​​Racket; 30. Elastic lever; 31. Limiting groove; 32. Limiting tooth; 33. Spring; 34. Turntable; 35. Pulley pin; 36. Swing arm; 37. Slot; 38. Exhaust gas absorption box; 39. Connector. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] Please see Figures 1-10As an embodiment of the present invention, an environmental protection soil heavy metal pollution detection device includes a frame 1, a digestion tank 2 rotatably mounted on the frame 1, and a rotating mechanism for driving the digestion tank 2 to rotate on the frame 1. The rotating mechanism includes a main drive shaft 5 rotatably mounted on the frame 1. The main drive shaft 5 and the digestion tank 2 are connected by a first linkage mechanism. When the main drive shaft 5 rotates, it will drive the digestion tank 2 to rotate synchronously.

[0036] Two air pumping mechanisms are installed on the frame 1. The two air pumping mechanisms are connected to the main drive shaft 5 through a second linkage mechanism. During the rotation of the main drive shaft 5, the second linkage mechanism periodically drives the two air pumping mechanisms to operate alternately.

[0037] During each working cycle, when one of the gas pumping mechanisms pumps gas into the digestion tank 2 to create positive pressure, the other gas pumping mechanism is in a non-operating state; when the other gas pumping mechanism draws gas from the digestion tank 2 to create negative pressure, the first gas pumping mechanism is in a non-operating state.

[0038] In this embodiment, a feed hopper 3 is fixed to the top of the digestion tank 2. The feed hopper 3 is used to add strong acid and crushed soil samples into the digestion tank 2. A cover plate is detachably installed on the feed hopper 3 to seal the digestion tank 2 during the reaction process and prevent leakage of strong acid gas. A discharge valve 4 is fixed to the bottom of the digestion tank 2 to remove the digested soil material and waste liquid. During testing, the strong acid and crushed soil samples are first added to the digestion tank 2 through the feed hopper 3. Then, the cover plate on the feed hopper 3 is tightened to seal the tank. The main drive shaft 5 is then driven to rotate. The digestion tank 2 rotates at a uniform speed under the drive of the main drive shaft 5 and the first linkage mechanism, generating centrifugal force and tangential flow to initially mix the strong acid and soil inside the digestion tank 2. Simultaneously, the main drive shaft 5, in conjunction with the second linkage mechanism, periodically drives two pumping mechanisms to alternately operate, pumping air into the tank to create positive pressure or drawing air from the tank to create negative pressure, thus implementing positive pressure. During gas pumping, the pumping mechanism rapidly injects gas into the digestion tank 2, causing a sudden increase in pressure inside the tank. This compresses the liquid downwards and forces bubbles to rise from the bottom, creating violent turbulence. When negative pressure suction is applied, the pumping mechanism rapidly extracts some gas from the digestion tank 2, causing a sudden drop in pressure. The dissolved gas inside the liquid is quickly released, forming tiny bubbles. Simultaneously, the liquid experiences a strong backflow from top to bottom. This combination of high-frequency pressurization-suction circulation and the rotation of the digestion tank 2 creates violent up-and-down turbulence and convection within the tank, generating continuous and intense three-dimensional vortices and shear forces. This significantly enhances the mass and heat transfer process inside the digestion tank 2, ensuring the thorough digestion of the soil. After digestion, the heavy metals in the soil are fully dissolved in the acid solution. After settling, the test solution containing heavy metals can be removed by opening the discharge valve 4 for subsequent precise testing.

[0039] As a further embodiment of the present invention, a motor 6 is fixed on the frame 1, and the output end of the motor 6 is connected to the main drive shaft 5 through a coupling to drive the main drive shaft 5 to rotate.

[0040] In this embodiment, the motor 6 is electrically connected to an external power source via wires. Starting the motor 6 can drive the main drive shaft 5 to rotate, and the motor 6 is also the only power source of the device.

[0041] As a further embodiment of the present invention, the first linkage mechanism includes a first transmission shaft 7 rotatably mounted on the frame 1. The first transmission shaft 7 is engaged with the main drive shaft 5 through a worm gear mechanism. When the main drive shaft 5 rotates, it will drive the first transmission shaft 7 to rotate synchronously. A hollow shaft 10 is rotatably mounted on the frame 1. The hollow shaft 10 is engaged with the first transmission shaft 7 through a first gear mechanism. When the first transmission shaft 7 rotates, it will drive the hollow shaft 10 to rotate synchronously. The bottom end of the digestion tank 2 is rotatably connected to the frame 1 through a bearing, and the top end is fixedly connected to the hollow shaft 10.

[0042] In this embodiment, when the main drive shaft 5 rotates, it drives the first transmission shaft 7 to rotate synchronously. When the first transmission shaft 7 rotates, it drives the hollow shaft 10 to rotate synchronously. When the hollow shaft 10 rotates, it drives the digestion tank 2 to rotate synchronously. The worm gear mechanism has a large reduction ratio, which can convert the high-speed rotation of the main drive shaft 5 into a lower but higher torque speed of the first transmission shaft 7. This is suitable for driving the digestion tank 2 with a heavy load. At the same time, the structure has self-locking properties, which can prevent the digestion tank 2 from continuing to rotate due to inertia when the motor stops and the main drive shaft 5 stops rotating.

[0043] As a further embodiment of the present invention, the worm gear mechanism includes a worm 8 fixed on the main drive shaft 5 and a worm wheel 9 fixed on the first transmission shaft 7, wherein the worm 8 meshes with the worm wheel 9;

[0044] The first gear mechanism includes a drive gear 11 fixed on the first transmission shaft 7 and rotatably mounted on the frame 1, and a driven gear 12 fixed on the hollow shaft 10 and rotatably mounted on the frame 1, wherein the drive gear 11 meshes with the driven gear 12.

[0045] In this embodiment, when the main drive shaft 5 rotates, it drives the worm 8 to rotate. The worm 8 meshes with the worm wheel 9, which in turn drives the worm wheel 9 to rotate, thereby driving the first transmission shaft 7 to rotate.

[0046] When the first drive shaft 7 rotates, it will drive the drive gear 11 to rotate. The drive gear 11 meshes with the driven gear 12, which will drive the driven gear 12 to rotate, thereby driving the hollow shaft 10 to rotate.

[0047] As a further embodiment of the present invention, the air pumping mechanism includes a barrel 13 fixed on the frame 1, a piston rod 14 movably inserted into the barrel 13, a piston 15 movably engaged with the piston rod 14 and the barrel 13, a second air pipe 17 and a first air pipe 16 communicating with the inside of the digestion tank 2 are fixed on the barrel 13, a one-way valve is installed on the first air pipe 16 and the second air pipe 17 respectively, a connector 39 is rotatably installed on the top end of the hollow shaft 10, and the end of the first air pipe 16 is fixed on the connector 39 and communicates with the inside of the hollow shaft 10.

[0048] In this embodiment, when the piston rod 14 moves up and down, it drives the piston 15 to move up and down inside the barrel 13. In conjunction with the first air pipe 16 and the second air pipe 17, gas can be extracted from or delivered into the digestion tank 2. The one-way valve ensures that one of the two pumping mechanisms allows gas from inside the digestion tank 2 to enter the barrel 13 through the first air pipe 16 and then be discharged outward through the second air pipe 17. The other pumping mechanism allows external gas to enter the barrel 13 through the second air pipe 17 and then be delivered into the digestion tank 2 through the first air pipe 16. In addition, the connector 39 is connected to the hollow shaft 10. The barrel 13 and the hollow shaft 10 form a rotary sealed passage, so that even if the digestion tank 2 is rotating continuously, the air passage between the first air pipe 16 and the hollow shaft 10 can still be kept connected.

[0049] As a further embodiment of the present invention, the second linkage mechanism includes a secondary drive shaft 21 rotatably mounted on the frame 1. The main drive shaft 5 and the secondary drive shaft 21 are connected by a pulley mechanism. When the main drive shaft 5 rotates, it drives the secondary drive shaft 21 to rotate synchronously. Two crank shafts 18 are rotatably mounted on the frame 1. The two crank shafts 18 are connected to the main drive shaft 5 and the secondary drive shaft 21 respectively by an intermittent mechanism. When the main drive shaft 5 and the secondary drive shaft 21 rotate, they periodically drive the two crank shafts 18 to rotate alternately. In each working cycle, when one crank shaft 18 rotates, the other crank shaft 18 does not rotate; when the other crank shaft 18 rotates, the first crank shaft 18 does not rotate.

[0050] The two crankshafts 18 are connected to the piston rod 14 through a crank-connecting rod mechanism. When the crankshaft 18 rotates, it will drive the piston rod 14 to move up and down reciprocally.

[0051] In this embodiment, when the main drive shaft 5 rotates, it will drive the auxiliary drive shaft 21 to rotate synchronously. When the main drive shaft 5 and the auxiliary drive shaft 21 rotate, they will periodically drive the two crank shafts 18 to rotate alternately. Therefore, they can alternately drive the two piston rods 14 to move up and down reciprocally, ensuring the timing of the pressurization and suction actions.

[0052] As a further embodiment of the present invention, the pulley mechanism includes a driving toothed pulley 22 fixed on the main drive shaft 5 and a driven toothed pulley 23 fixed on the auxiliary drive shaft 21. The driving toothed pulley 22 and the driven toothed pulley 23 are driven by a toothed belt 24.

[0053] In this embodiment, when the main drive shaft 5 rotates, it drives the active toothed pulley 22 to rotate. The active toothed pulley 22 and the driven toothed pulley 23 are driven to rotate by the toothed belt 24, thereby driving the auxiliary drive shaft 21 to rotate.

[0054] As a further embodiment of the present invention, the intermittent mechanism includes a turntable 34 fixed on the main drive shaft 5 and the auxiliary drive shaft 21 respectively. A gear ring 25 and a drive disk 27 are rotatably mounted on the frame 1. A swing arm 36 is fixed on the drive disk 27, and a slot 37 is provided on the swing arm 36. A pin 35 is fixed on the turntable 34 and is movably engaged in the slot 37. A ratchet groove 28 is provided on the inner wall of the gear ring 25. A ratchet 29 is hinged on the drive disk 27 and is movably engaged in the ratchet groove 28. A flexible paddle 30 is provided, with one end of the flexible paddle 30 fixed to the drive disc 27 and the other end movably attached to one edge of the ratchet 29. A limit groove 31 is fixed on the frame 1, and a limit tooth 32 that meshes with the gear ring 25 is movably engaged in the limit groove 31. A spring 33 is provided in the limit groove 31, with one end of the spring 33 fixed to the limit tooth 32 and the other end connected to the inner wall of the limit groove 31. A transmission gear 26 is fixed on the crankshaft 18 and meshes with the gear ring 25.

[0055] In this embodiment, during operation, the main drive shaft 5 rotates, causing the turntable 34 to rotate at a constant speed. When the pin 35 on it enters the slot 37 of the rocker arm 36, it causes the rocker arm 36 to swing back and forth, thereby causing the slot 37 to rotate back and forth clockwise and counterclockwise by a certain angle. When the drive disk 27 rotates counterclockwise, the ratchet 29 on it swings and moves the ratchet groove 28 of the gear ring 25, causing the gear ring 25 to rotate through a pitch angle. The gear ring 25 drives the crank shaft 18 to rotate through the transmission gear 26 meshing with it, thereby pulling the piston rod 14 to complete a complete stroke. When the drive disk 27 rotates clockwise, the ratchet 29 overcomes the elastic force of the elastic plate 30 and disengages from the ratchet groove 28. Therefore, the gear ring 25 does not rotate, and the crank shaft 18 stops rotating. The piston rod 14 stays in one position, that is, the main drive shaft 5 rotates intermittently. The piston rod 14 moves up and down and then stops for a period of time. Similarly, when the auxiliary drive shaft 21 rotates, it will also intermittently drive the other piston rod 14 to move up and down and then stop for a period of time. By setting two sets of intermittent mechanisms on the main drive shaft 5 and the auxiliary drive shaft 21 and staggering their phases, the two crank shafts 18 can be rotated alternately, that is, the two sets of pumping mechanisms can be operated alternately. The function of the spring 33 is mainly to restrict the rotation of the gear ring 25 by the elastic force of the limiting tooth 32. When the drive disk 27 rotates counterclockwise, the thrust of the ratchet 29 on the ratchet groove 28 can overcome the elastic pressure of the limiting tooth 32 and push the gear ring 25 to rotate. When the drive disk 27 rotates clockwise, the thrust of the ratchet 29 on the ratchet groove 28 is not enough to overcome the elastic pressure of the limiting tooth 32, so the gear ring 25 will not rotate.

[0056] As a further embodiment of the present invention, the crank-connecting rod mechanism includes a crank disc 19 fixed on a crankshaft 18, and a connecting rod 20 is provided between the crank disc 19 and the piston rod 14, with both ends of the connecting rod 20 being hinged to the crank disc 19 and the piston rod 14, respectively.

[0057] In this embodiment, when the crankshaft 18 rotates, it drives the crank disc 19 to rotate, which in turn drives the connecting rod 20 to pull the piston rod 14 up and down, thereby driving the piston 15 to move up and down within the barrel 13, converting the rotational motion of the crankshaft 18 into the linear reciprocating motion of the piston rod 14.

[0058] As a further embodiment of the present invention, an exhaust gas absorption box 38 is fixed on the frame 1, and a second gas pipe 17 extends into the interior of the exhaust gas absorption box 38.

[0059] In this embodiment, during the digestion process, one of the pumping mechanisms continuously draws the strong acid waste gas in the digestion tank 2 into the alkaline absorption liquid inside the waste gas absorption box 38 through the second gas pipe 17. The acid mist and the alkaline liquid undergo a neutralization reaction to generate harmless salt and water, thereby achieving the purpose of purifying the air and ensuring safety.

[0060] The working principle of this invention is as follows: During operation, the motor 6 starts, driving the main drive shaft 5 to rotate. The power is transmitted in two paths: one path, through a transmission chain consisting of a worm gear 8, a worm wheel 9, a driving gear 11, and a driven gear 12, ultimately drives the digestion tank 2 to rotate at a constant speed; the other path, the main drive shaft 5 drives the auxiliary drive shaft 21 to rotate synchronously. The main drive shaft 5 and the auxiliary drive shaft 21, respectively, drive two crankshafts 18 to rotate periodically and alternately through intermittent mechanisms. The crankshafts 18 drive the corresponding pistons 15 to reciprocate through a crank-connecting rod mechanism. When one piston 15 moves upward, a negative pressure is generated in its corresponding barrel 13, and external air is drawn in through the second air pipe 17; when the piston 15 of one of the pumping mechanisms moves upward... The gas inside the cylinder is forced into the rotating digestion tank 2 through the first gas pipe 16, forming a positive pressure pulse. During this process, the other gas pumping mechanism is not working. Afterward, the other gas pumping mechanism operates, and the other piston 15 moves upward to generate negative pressure in the tank 13. Gas is drawn from the digestion tank 2 through the first gas pipe 16, forming a negative pressure pulse inside the digestion tank 2. The drawn gas is strong acid mist, which is discharged into the waste gas absorption box 38 through the second gas pipe 17 for neutralization and absorption. The two gas pumping mechanisms work alternately in this cycle, so that while the digestion tank 2 generates tangential mixing by its own rotation, the liquid inside is also subjected to violent tumbling, cavitation and convection caused by the alternating positive and negative gas pressure pulses. The two mixing effects work together to greatly improve the digestion efficiency and effect.

[0061] The above embodiments are exemplary and not restrictive. Therefore, any technical solutions that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention are included within the scope of the present invention.

Claims

1. An environmental protection soil heavy metal pollution detection device, comprising a frame (1), characterized in that: A digestion tank (2) is rotatably mounted on the frame (1). A rotating mechanism for driving the digestion tank (2) to rotate is provided on the frame (1). The rotating mechanism includes a main drive shaft (5) rotatably mounted on the frame (1). The main drive shaft (5) and the digestion tank (2) are connected by a first linkage mechanism. When the main drive shaft (5) rotates, it will drive the digestion tank (2) to rotate synchronously. Two gas pumping mechanisms are provided on the frame (1). The two gas pumping mechanisms are connected by a second linkage mechanism to the main drive shaft (5). In each working cycle, when one gas pumping mechanism pumps gas into the digestion tank (2) to form a positive pressure, the other gas pumping mechanism is in a non-operating state. When the other gas pumping mechanism draws gas from the digestion tank (2) to form a negative pressure, the first gas pumping mechanism is in a non-operating state. The top of the digestion vessel (2) is fixedly connected to the hollow shaft (10); the pumping mechanism includes a barrel (13) fixed on the frame (1), and a piston rod (14) is movably inserted into the barrel (13); a second air pipe (17) and a first air pipe (16) communicating with the inside of the digestion vessel (2) are fixed on the barrel (13), and one-way valves are respectively installed on the first air pipe (16) and the second air pipe (17); the end of the first air pipe (16) is communicating with the inside of the hollow shaft (10); the second linkage mechanism includes a secondary drive shaft (21) rotatably mounted on the frame (1). When the main drive shaft (5) rotates, it will drive the auxiliary drive shaft (21) to rotate synchronously. Two crank shafts (18) are rotatably mounted on the frame (1). The two crank shafts (18) are respectively connected to the main drive shaft (5) and the auxiliary drive shaft (21) through an intermittent mechanism. When the main drive shaft (5) and the auxiliary drive shaft (21) rotate, they will periodically drive the two crank shafts (18) to rotate alternately. The two crank shafts (18) are respectively connected to the piston rod (14) through a crank-connecting rod mechanism. When the crank shafts (18) rotate, they will drive the piston rod (14) to move up and down reciprocally. One of the gas pumping mechanisms allows the gas inside the digester (2) to enter the barrel (13) through the first gas pipe (16) in one direction, and then be discharged to the waste gas absorption box (38) through the second gas pipe (17). The other gas pumping mechanism allows the external gas to enter the barrel (13) through the second gas pipe (17) in one direction, and then be transported into the digester (2) through the first gas pipe (16).

2. The environmental protection soil heavy metal pollution detection device according to claim 1, characterized in that, A motor (6) is fixed on the frame (1), and the output end of the motor (6) is connected to the main drive shaft (5) through a coupling to drive the main drive shaft (5) to rotate.

3. The environmental protection soil heavy metal pollution detection device according to claim 1, characterized in that, The first linkage mechanism includes a first transmission shaft (7) rotatably mounted on the frame (1). The first transmission shaft (7) is connected to the main drive shaft (5) through a worm gear mechanism. When the main drive shaft (5) rotates, it will drive the first transmission shaft (7) to rotate synchronously. A hollow shaft (10) is rotatably mounted on the frame (1). The hollow shaft (10) is connected to the first transmission shaft (7) through a first gear mechanism. When the first transmission shaft (7) rotates, it will drive the hollow shaft (10) to rotate synchronously. The bottom end of the digestion tank (2) is rotatably connected to the frame (1) through a bearing.

4. The environmental protection soil heavy metal pollution detection device according to claim 3, characterized in that, The worm gear mechanism includes a worm (8) fixed on the main drive shaft (5) and a worm wheel (9) fixed on the first transmission shaft (7), wherein the worm (8) meshes with the worm wheel (9); The first gear mechanism includes a drive gear (11) fixed on the first transmission shaft (7) and rotatably mounted on the frame (1), and a driven gear (12) fixed on the hollow shaft (10) and rotatably mounted on the frame (1). The drive gear (11) meshes with the driven gear (12).

5. The environmental protection soil heavy metal pollution detection device according to claim 3, characterized in that, A piston (15) is fixed on the piston rod (14) and is movably engaged in the barrel (13). A connector (39) is rotatably installed on the top end of the hollow shaft (10). The end of the first air pipe (16) is fixed on the connector (39).

6. The environmental protection soil heavy metal pollution detection device according to claim 5, characterized in that, The main drive shaft (5) and the auxiliary drive shaft (21) are connected by a pulley mechanism.

7. The environmental protection soil heavy metal pollution detection device according to claim 6, characterized in that, The pulley mechanism includes an active toothed pulley (22) fixed on the main drive shaft (5) and a driven toothed pulley (23) fixed on the auxiliary drive shaft (21). The active toothed pulley (22) and the driven toothed pulley (23) are driven by a toothed belt (24).

8. The environmental protection soil heavy metal pollution detection device according to claim 6, characterized in that, The intermittent mechanism includes a turntable (34) fixed on the main drive shaft (5) and the auxiliary drive shaft (21) respectively. A gear ring (25) and a drive disk (27) are rotatably mounted on the frame (1). A swing arm (36) is fixed on the drive disk (27). A slot (37) is provided on the swing arm (36). A pin (35) is fixed on the turntable (34) and is movably engaged in the slot (37). A ratchet groove (28) is provided on the inner wall of the gear ring (25). A ratchet (29) is hinged on the drive disk (27) and is movably engaged in the ratchet groove (28). A spring is provided on the drive disk (27). A paddle (30) is provided, one end of which is fixed to the drive disc (27), and the other end is movably attached to one side edge of the ratchet (29). A limiting groove (31) is fixed on the frame (1). A limiting tooth (32) that meshes with the gear ring (25) is movably engaged in the limiting groove (31). A spring (33) is provided in the limiting groove (31). One end of the spring (33) is fixed to the limiting tooth (32), and the other end is connected to the inner wall of the limiting groove (31). A transmission gear (26) is fixed on the crankshaft (18), and the transmission gear (26) meshes with the gear ring (25).

9. The environmental protection soil heavy metal pollution detection device according to claim 6, characterized in that, The crank-connecting rod mechanism includes a crank disc (19) fixed on a crankshaft (18), and a connecting rod (20) is provided between the crank disc (19) and the piston rod (14). The two ends of the connecting rod (20) are respectively hinged to the crank disc (19) and the piston rod (14).

10. The environmental protection soil heavy metal pollution detection device according to claim 5, characterized in that, The frame (1) is fixed with an exhaust gas absorption box (38), and a second air pipe (17) of one of the pumping mechanisms extends into the exhaust gas absorption box (38).

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