Electric heater connecting device for soil in-situ thermal desorption electric heating

Abstract

The invention belongs to the technical field of contaminated soil in-situ thermal desorption repair, and particularly relates to an electric heater connecting device for soil in-situ thermal desorption electric heating, which comprises a first flange, a second flange and a third flange, and a group of mounting holes are formed in the second flange and the third flange; the device is characterized in that the bottom surface of the first flange is fixedly connected with a group of extension pipes; the screws make contact with the positioning ring so that all the screws can be located on the same horizontal plane, then the nuts are installed from the positions above the screws, the nuts are screwed to make contact with the second flange, then the cylinders are moved, the positioning ring does not make contact with the screws any more, and at the moment, threads cannot move due to limiting of the nuts above; and then the remaining nuts are screwed down from the lower portion of the threaded rod till the remaining nuts make contact with the bottom face of the third flange, so that the extension pipe and the heating rod are rapidly and conveniently assembled, and the connection convenience is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of in-situ thermal desorption remediation of contaminated soil, and specifically is an electric heater connection device for in-situ thermal desorption electric heating of soil. Background Art

[0002] In-situ thermal desorption is a process that inputs heat energy into the ground to heat the soil and groundwater, change the saturated vapor pressure and solubility of the target pollutants, promote the volatilization, dissolution or degradation of pollutants, and remove the target pollutants through soil gas phase extraction or multiphase extraction. In-situ thermal desorption technology can be used to treat volatile organic pollutants and semi-volatile organic pollutants such as benzene, petroleum hydrocarbons, halogenated hydrocarbons, polychlorinated biphenyls, dioxins, etc. in contaminated soil and groundwater. Electric heaters are heat conduction heating technologies that use electricity for direct heating. They are the development trend of in-situ thermal desorption technology. This technology has cost advantages in areas with sufficient electricity supply. This technology takes a short time and can treat multiple pollutants at the same time. It has strong applicability and high remediation efficiency for low-permeability pollution areas and heterogeneous pollution areas.

[0003] The above technology often has the following defects: In the current structure of electric heaters, key components such as heating rods and controllers are mainly included. The length of the heating section of the electric heating rod needs to be flexibly set according to the actual site requirements, which means that in certain situations, the electric heating rod needs to be connected in multiple sections to meet different working conditions. Usually, flange structures are provided at the adjacent ends of the electric heating rods, and screws and bolts are used to achieve the purpose of connecting the sections of the electric heating rods.

[0004] During the specific connection process, multiple screws need to pass through the corresponding flanges. However, the existing installation method has obvious defects. Due to the lack of effective overall pre-positioning means, the only installation strategy is to pass the screws through the flanges one by one. Figure 1 When all the screws are passed through the flange at once, it is very easy for the screws to be misaligned and unable to be accurately aligned. This misalignment of the screws will directly lead to many difficulties in the fixing link when connecting multiple sections of electric heating rods. Therefore, the present invention provides an electric heater connection device for in-situ thermal desorption electric heating of soil. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an electric heater connection device for in-situ thermal desorption electric heating of soil described in the present invention comprises a first flange, a second flange and a third flange, and a group of mounting holes are opened on the second flange and the third flange; it is characterized in that: a group of extension tubes are fixedly connected to the bottom surface of the first flange, the top of the extension tubes is connected to a wire, and the second flange is fixed to the bottom surface of the extension tube; a group of heating rods are fixedly connected to the third flange, a detachable connecting tube is arranged between the heating rod and the extension tube, and the wire passes through the connecting tube to be electrically connected to the heating rod; a screw is arranged in the mounting hole, a pair of nuts are threadedly connected to the screw, a connecting column is fixedly connected to the bottom surface of the third flange, and the connecting column is opened at one end away from the second flange; a cylinder is arranged on the connecting column, and a positioning ring for positioning the screw is fixedly connected to the side wall of the cylinder through a bracket, and a positioning component for positioning the cylinder is arranged in the connecting column.

[0007] The positioning assembly includes a connecting groove opened on the inner wall of the connecting column, a clamping groove is opened on the side wall of the cylinder corresponding to the movable groove, a clamping block is clamped in the clamping groove, a connecting rod is fixedly connected to the end of the clamping block away from the cylinder, the connecting rod passes through the side wall of the connecting column, and a first spring is fixedly connected between the clamping block and the connecting groove.

[0008] One end of the positioning ring close to the screw is fixedly connected to a limiting sleeve, the inner wall of the limiting sleeve is fixedly connected to an elastic ring, and the elastic ring is sleeved on the screw.

[0009] The interior of the elastic ring is a hollow structure, the cylinder is sealingly and slidingly connected to the inner wall of the connecting column, a first conduit is connected between the elastic ring and the connecting column, and a second spring is fixedly connected between one end of the cylinder close to the connecting column and the inner wall of the connecting column.

[0010] Lubricating oil is stored in the connecting column, the interior of the nut is a hollow structure, the side wall of the connecting column is provided with through holes corresponding to the number of nuts, an oil injection mechanism is provided between the through holes and the interior of the nut, and the inner wall of the nut is provided with a group of oil outlet holes.

[0011] The oil injection mechanism includes a round tube connected to the through hole, a second conduit is connected inside the round tube, a fixing ring is rotatably connected to the top of the nut, the bottom end of the fixing ring is open, and the bottom end of the fixing ring extends into the nut, and the end of the second conduit away from the round tube is connected to the inside of the connecting ring.

[0012] The connecting column is provided with an annular slide groove connected to the through hole, a sealing ring is slidably connected in the annular slide groove to seal the through hole, a circular hole corresponding to the through hole is provided on the sealing ring, and a driving component for driving the sealing ring to move is arranged in the cylinder.

[0013] The driving assembly includes a magnetic ring fixedly connected to the bottom surface of the cylinder, the sealing ring is made of a magnetic material that is magnetically attracted to the magnetic ring, and a group of third springs are fixedly connected between the end of the sealing ring away from the magnetic ring and the inner wall of the slide groove.

[0014] A rotation groove is provided at one end of the cylinder away from the connecting column, and a round rod is sealingly and rotatably connected to the inner wall of the rotation groove. A torsion spring is arranged between the side wall of the round rod and the rotation groove, and a group of connecting holes are provided on the round rod. A funnel is fixedly connected to one end of the round rod away from the connecting column, and a circular groove is provided at one end of the cylinder away from the funnel, and a group of connecting grooves corresponding to the connecting holes are provided between the circular groove and the rotation groove.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention allows the screw rods to contact the positioning ring so that all the screw rods can be in the same horizontal plane, and then the nuts are installed from above the screw rods, so that the nuts are tightened and contacted with the second flange, and then the cylinder is moved so that the positioning ring is no longer in contact with the screw rod. At this time, the thread will not move due to the limitation of the upper nut, and then the remaining nuts are tightened from below the screw rod until they contact with the bottom surface of the third flange, so that the extension tube and the heating rod can be assembled quickly and conveniently, greatly improving the convenience of connection.

[0017] 2. The present invention can position the cylinder by engaging the block with the slot so that all the screws can be in contact and aligned with the positioning ring. When the positioning ring needs to be moved, the connecting rod can be pulled to make the block slide out of the slot. At this time, the cylinder can be moved so that the cylinder drives the positioning ring no longer in contact with the screw. When the block needs to be engaged with the slot, the cylinder is moved to align the block with the slot. At this time, the block will be engaged with the slot under the push of the first spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structure after the extension tube and the heating rod are connected in the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the connecting device in the present invention;

[0021] Figure 3 yes Figure 2 A magnified image of point A;

[0022] Figure 4 yes Figure 2 A magnified view of point B;

[0023] Figure 5 It is a schematic diagram of the internal structure of the cylinder and the connecting column in the present invention.

[0024] In the figure: 1. first flange; 2. second flange; 3. third flange; 4. extension pipe; 5. connecting pipe; 6. heating rod; 7. screw; 8. nut; 9. connecting column; 10. cylinder; 11. movable groove; 12. positioning ring; 13. connecting rod; 14. limiting sleeve; 15. elastic ring; 16. first conduit; 17. through hole; 18. round pipe; 19. second conduit; 20. oil outlet hole; 21. fixing ring; 22. slide groove; 23. sealing ring; 24. magnetic ring; 25. round hole; 26. round rod; 27. connecting groove; 28. round groove; 29. ​​block. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] Embodiment 1: Figures 1 to 4 As shown, an electric heater connection device for in-situ thermal desorption electric heating of soil according to an embodiment of the present invention comprises a first flange 1, a second flange 2 and a third flange 3, wherein a group of mounting holes are provided on the second flange 2 and the third flange 3; the characteristics are as follows: a group of extension tubes 4 are fixedly connected to the bottom surface of the first flange 1, a wire is connected to the top of the extension tube 4, and the second flange 2 is fixed to the bottom surface of the extension tube 4; a group of heating rods 6 are fixedly connected to the third flange 3, a detachable connecting tube 5 is provided between the heating rod 6 and the extension tube 4, and the wire passes through the connecting tube 5 and is electrically connected to the heating rod 6; a screw 7 is provided in the mounting hole, a pair of nuts 8 are threadedly connected to the screw 7, a connecting column 9 is fixedly connected to the bottom surface of the third flange 3, and the connecting column 9 is provided with an opening at one end away from the second flange 2; a cylinder 10 is provided on the connecting column 9, a positioning ring 12 for positioning the screw 7 is fixedly connected to the side wall of the cylinder 10 through a bracket, and a positioning component for positioning the cylinder 10 is provided in the connecting column 9;

[0027] When assembling the heating rod 6 and the extension tube 4, the present application first connects the heating rod 6 and the extension tube 4 by connecting the tube 5, and then passes all the screws 7 through the second flange 2 in turn, and then passes through the mounting holes of the third flange 3 until they contact the positioning ring 12. At this time, all the screws 7 are in the same horizontal plane and pass through the mounting holes on the second flange 2 in turn so that the screws 7 contact the positioning ring 12. Then, the nut 8 is installed from above the screw 7 so that the nut 8 is tightened and contacts the second flange 2. Then, the cylinder 10 is moved so that the positioning ring 12 no longer contacts the screw 7. At this time, the thread will not move due to the limitation of the nut 8 above. Then, the remaining nuts 8 are tightened from below the screw 7 until they contact the bottom surface of the third flange 3. The above mechanism can quickly and conveniently assemble the extension tube 4 and the heating rod 6, greatly improving the convenience of connection.

[0028] The positioning assembly includes a connecting groove 27 provided on the inner wall of the connecting column 9, a slot is provided at the side wall of the cylinder 10 corresponding to the movable groove 11, a block 29 is clamped in the slot, and the end of the block 29 away from the cylinder 10 is fixedly connected to the connecting rod 13, the connecting rod 13 passes through the side wall of the connecting column 9, and a first spring is fixedly connected between the block 29 and the connecting groove 27; the present application can position the cylinder 10 by clamping the block 29 with the slot, so that all the screws 7 can be contacted and aligned with the positioning ring 12. When the positioning ring 12 needs to be moved, the connecting rod 13 can be pulled to make the block 29 slide out of the slot. At this time, the cylinder 10 can be moved so that the cylinder 10 drives the positioning ring 12 no longer in contact with the screw 7. When the block 29 needs to be clamped with the slot, the cylinder 10 is moved so that the block 29 is aligned with the slot. At this time, the block 29 will be clamped with the slot under the push of the first spring.

[0029] The end of the positioning ring 12 close to the screw 7 is fixedly connected to a limiting sleeve 14, and the inner wall of the limiting sleeve 14 is fixedly connected to an elastic ring 15, and the elastic ring 15 is sleeved on the screw 7; when the nut 8 in the present application is twisted on the screw 7, the screw 7 is prone to rotate. Through the above-mentioned mechanism, after the screw 7 is inserted into the limiting sleeve 14, the elastic ring 15 can be sleeved on the screw 7 to apply pressure on the screw 7, so that the screw 7 will not rotate when the nut 8 is installed, so as to further improve the convenience of connecting the extension tube 4 and the heating rod 6.

[0030] The interior of the elastic ring 15 is a hollow structure, the cylinder 10 is sealingly and slidingly connected to the inner wall of the connecting column 9, the elastic ring 15 and the connecting column 9 are connected by a first conduit 16, and a second spring is fixedly connected between the end of the cylinder 10 close to the connecting column 9 and the inner wall of the connecting column 9; the block 29 and the slot in the present application are normally in a disengaged state, after the screw 7 passes through the second flange 2 and the third flange 3, the screw 7 will enter the limiting sleeve 14, and at this time it can move to the side close to the second spring, so that the cylinder 10 pushes the gas in the connecting column 9 from the first conduit 16 into the elastic ring 15, so that the elastic ring 15 expands and fits and squeezes the screw 7 to improve the fixing effect of the screw 7, and in the fixing process of the movement of the cylinder 10, the block 29 will be engaged with the slot, and the elastic ring 15 has completed expansion at this time.

[0031] Lubricating oil is stored in the connecting column 9, and the interior of the nut 8 is a hollow structure. The side wall of the connecting column 9 is provided with through holes 17 corresponding to the number of nuts 8, and an oil injection mechanism is arranged between the through hole 17 and the interior of the nut 8. A group of oil outlet holes 20 are arranged on the inner wall of the nut 8; after the nut 8 and the screw rod 7 in the present application are connected for a long time, the connection will inevitably be corroded, especially since the device needs to be used underground, which is more susceptible to corrosion, resulting in difficulty in rotating the extension tube 4 and the heating rod 6 when they are disassembled. The present application can allow the block 29 to disengage from the slot, and then allow the cylinder 10 to move toward one side of the second spring, so that the cylinder 10 pushes the lubricating oil in the connecting column 9 to be injected into the nut 8 from the oil injection mechanism, and finally flows out from the oil outlet hole 20, so as to disassemble the connection between the nut 8 and the screw rod 7, thereby facilitating the subsequent disassembly of the nut 8.

[0032] The oil injection mechanism includes a round tube 18 connected to the through hole 17, a second conduit 19 is connected to the round tube 18, a fixing ring 21 is rotatably connected to the top of the nut 8, the bottom end of the fixing ring 21 is open, and the bottom end of the fixing ring 21 extends to the inside of the nut 8, and the end of the second conduit 19 away from the round tube 18 is connected to the inside of the connecting ring; when the cylinder 10 in the present application squeezes the lubricating oil in the connecting column 9, the lubricating oil will enter the round tube 18 from the through hole 17, and then enter the fixing ring 21 from the second conduit 19, and finally enter the nut 8, so as to smoothly inject the lubricating oil into the nut 8, and the fixing ring 21 rotatably connected to the nut 8 can not affect the rotation of the nut 8 on the screw rod, and at the same time, it can also prevent the nut 8 from being lost.

[0033] The connecting column 9 is provided with an annular groove 22 connected to the through hole 17, and a sealing ring 23 for sealing the through hole 17 is slidably connected in the annular groove 22. The sealing ring 23 is provided with a circular hole 25 corresponding to the through hole 17, and a driving component for driving the sealing ring 23 to move is provided in the cylinder 10; in the present application, when the lubricating oil does not need to be discharged from the through hole 17, the through hole 17 needs to be sealed, otherwise the lubricating oil in the connecting column 9 may be pushed out when the cylinder 10 moves, and the through hole 17 can be sealed by the sealing ring 23 in the above-mentioned mechanism. When the lubricating oil needs to be discharged, the driving component can drive the sealing ring 23 to move so that the through hole 17 is aligned with the circular hole 25. At this time, the lubricating oil can normally enter the circular tube 18 from the through hole 17. When the through hole 17 needs to be sealed, the driving component drives the sealing ring 23 to reset so that the outer wall of the sealing ring 23 is fitted and sealed with the through hole 17.

[0034] The driving assembly includes a magnetic ring 24 fixedly connected to the bottom surface of the cylinder 10, and the sealing ring 23 is made of a magnetic material that is magnetically attracted to the magnetic ring 24. A group of third springs are fixedly connected between the end of the sealing ring 23 away from the magnetic ring 24 and the inner wall of the slide groove 22; when the sealing ring 23 needs to be moved, the cylinder 10 can be pushed to make the magnetic ring 24 and the sealing ring 23 magnetically attracted, and then when the cylinder 10 moves, the sealing ring 23 will be driven to move so that the circular hole 25 is aligned with the through hole 17, and when the sealing ring 23 needs to be reset, the cylinder 10 can be moved upward, because the sealing ring 23 will be limited by the slide groove 22, and when the cylinder 10 moves, the magnetic ring 24 will be separated from the sealing ring 23.

[0035] Embodiment 2: Figure 5 As shown, compared with Example 1, another implementation of the present invention is: a rotation groove is provided at one end of the cylinder 10 away from the connecting column 9, and a round rod 26 is sealed and rotatably connected to the inner wall of the rotation groove, and a torsion spring is arranged between the side wall of the round rod 26 and the rotation groove, and a group of connecting holes are provided on the round rod 26, and a funnel is fixedly connected to the end of the round rod 26 away from the connecting column 9, and a circular groove 28 is provided at the end of the cylinder 10 away from the funnel, and a group of connecting grooves 27 corresponding to the connecting holes are provided between the circular groove 28 and the rotation groove; when it is necessary to inject lubricating oil into the connecting column 9, the round rod 26 can be rotated to align the connecting hole with the connecting groove 27, and then the lubricating oil is injected from the funnel, so that the lubricating oil enters the connecting column 9 along the connecting hole, the connecting groove 27 and the circular groove 28. After the lubricating oil is injected, the round rod 26 is released, and the round rod 26 is allowed to rotate and reset under the action of the torsion spring, and at this time the connecting hole will be misaligned with the connecting groove 27.

[0036] Working principle: When assembling the heating rod 6 and the extension tube 4, the present application first connects the heating rod 6 and the extension tube 4 by connecting the tube 5, and then passes all the screws 7 through the second flange 2 in turn, and then passes through the mounting holes of the third flange 3 until they contact the positioning ring 12. At this time, all the screws 7 are in the same horizontal plane, and pass through the mounting holes on the second flange 2 in turn, so that the screws 7 contact the positioning ring 12, and then install the nuts 8 from above the screws 7, so that the nuts 8 are tightened and contact the second flange 2, and then move the cylinder 10 so that the positioning ring 12 no longer contacts the screw 7. At this time, the thread will not move due to the limit of the nuts 8 above, and then the remaining nuts 8 are removed from the screws 7. The extension tube 4 and the heating rod 6 can be quickly and conveniently assembled by the above mechanism, which greatly improves the convenience of connection. The present application can position the cylinder 10 by engaging the block 29 with the slot, so that all the screws 7 can be aligned with the positioning ring 12. When the positioning ring 12 needs to be moved, the connecting rod 13 can be pulled to make the block 29 slide out of the slot. At this time, the cylinder 10 can be moved so that the cylinder 10 drives the positioning ring 12 no longer in contact with the screw 7. When the block 29 needs to be engaged with the slot, the cylinder 10 is moved so that the block 29 is aligned with the slot. At this time, the block 29 will be engaged with the slot under the push of the first spring.

[0037] When the nut 8 in the present application is screwed on the screw rod 7, the screw rod 7 is prone to rotate. Through the above-mentioned mechanism, after the screw rod 7 is inserted into the limiting sleeve 14, the elastic ring 15 can be sleeved on the screw rod 7 to apply pressure to the screw rod 7, so that when the nut 8 is installed, the screw rod 7 will not rotate, so as to further improve the convenience of connecting the extension tube 4 and the heating rod 6; the clamping block 29 in the present application is in a disengaged state from the clamping groove under normal circumstances. After the screw rod 7 passes through the second flange 2 and the third flange 3, the screw rod 7 will enter the limiting sleeve 14. At this time, it can move to the side close to the second spring, so that the cylinder 10 pushes the gas in the connecting column 9 from the first conduit 16 into the elastic ring 15, so that the elastic ring 15 expands and fits and squeezes the screw rod 7, so as to improve the fixing effect of the screw rod 7. In the fixing process of the movement of the cylinder 10, the clamping block 29 will be clamped with the clamping groove, and the elastic ring 15 has been expanded.

[0038] After the nut 8 and the screw rod 7 are connected for a long time in the present application, the connection will inevitably be corroded, especially when the device needs to be used underground, it is more susceptible to corrosion, resulting in difficulty in rotating the extension tube 4 and the heating rod 6 when they are disassembled. The present application can disengage the block 29 from the slot, and then move the cylinder 10 to one side of the second spring, so that the cylinder 10 pushes the lubricating oil in the connecting column 9 to be injected into the nut 8 from the oil injection mechanism, and finally flows out from the oil outlet 20, so as to disassemble the connection between the nut 8 and the screw rod 7, thereby facilitating the subsequent disassembly of the nut 8; when the cylinder 10 in the present application squeezes the lubricating oil in the connecting column 9, the lubricating oil will enter the circular tube 18 from the through hole 17, and then enter the fixing ring 21 from the second guide tube 19, and finally enter the nut 8, so as to smoothly inject the lubricating oil into the nut 8, and through the fixing ring 21 rotatably connected to the nut 8, the rotation of the nut 8 on the screw rod can be not affected, and the loss of the nut 8 can also be avoided;

[0039] In the present application, when the lubricating oil does not need to be discharged from the through hole 17, the through hole 17 needs to be sealed. Otherwise, when the cylinder 10 moves, the lubricating oil in the connecting column 9 may be pushed out. The through hole 17 can be sealed by the sealing ring 23 in the above-mentioned mechanism. When the lubricating oil needs to be discharged, the driving component can drive the sealing ring 23 to move so that the through hole 17 is aligned with the circular hole 25. At this time, the lubricating oil can normally enter the circular tube 18 from the through hole 17. When the through hole 17 needs to be sealed, the driving component drives the sealing ring 23 to move. 23 is reset, so that the outer wall of the sealing ring 23 is fitted and sealed with the through hole 17; when the sealing ring 23 needs to be moved, the present application can push the cylinder 10, so that the magnetic ring 24 and the sealing ring 23 are magnetically attracted, and then when the cylinder 10 moves, the sealing ring 23 will be driven to move, so that the circular hole 25 is aligned with the through hole 17, and when the sealing ring 23 needs to be reset, the cylinder 10 can be moved upward, because the sealing ring 23 will be limited by the slide groove 22, and when the cylinder 10 moves, the magnetic ring 24 will be separated from the sealing ring 23.

[0040] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electric heater connection device for in-situ thermal desorption electric heating of soil, comprising a first flange (1), a second flange (2) and a third flange (3), wherein a group of mounting holes are provided on the second flange (2) and the third flange (3); Features: A set of extension tubes (4) are fixedly connected to the bottom surface of the first flange (1), a wire is connected to the top of the extension tube (4), and the second flange (2) is fixed to the bottom surface of the extension tube (4); A group of heating rods (6) are fixedly connected to the third flange (3); a detachable connecting tube (5) is provided between the heating rods (6) and the extension tube (4); and the wire passes through the connecting tube (5) and is electrically connected to the heating rods (6); A screw rod (7) is arranged in the mounting hole, a pair of nuts (8) are threadedly connected to the screw rod (7), a connecting column (9) is fixedly connected to the bottom surface of the third flange (3), and the connecting column (9) is arranged with an opening at one end away from the second flange (2); The connecting column (9) is provided with a cylinder (10), the side wall of the cylinder (10) is fixedly connected to a positioning ring (12) for positioning the screw rod (7) through a bracket, and a positioning component for positioning the cylinder (10) is provided inside the connecting column (9).

2. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 1, characterized in that: The positioning assembly comprises a connecting groove (11) formed on the inner wall of the connecting column (9); a clamping groove is formed on the side wall of the cylinder (10) corresponding to the movable groove (11); a clamping block (29) is clamped in the clamping groove; an end of the clamping block (29) away from the cylinder (10) is fixedly connected to a connecting rod (13); the connecting rod (13) passes through the side wall of the connecting column (9); and a first spring is fixedly connected between the clamping block (29) and the connecting groove (27) (11).

3. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 2, characterized in that: One end of the positioning ring (12) close to the screw rod (7) is fixedly connected to a limiting sleeve (14), and the inner wall of the limiting sleeve (14) is fixedly connected to an elastic ring (15), and the elastic ring (15) is sleeved on the screw rod (7).

4. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 3, characterized in that: The interior of the elastic ring (15) is a hollow structure, the cylinder (10) is sealingly and slidably connected to the inner wall of the connecting column (9), a first conduit (16) is connected between the elastic ring (15) and the connecting column (9), and a second spring is fixedly connected between one end of the cylinder (10) close to the connecting column (9) and the inner wall of the connecting column (9).

5. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 4, characterized in that: Lubricating oil is stored in the connecting column (9), the interior of the nut (8) is a hollow structure, the side wall of the connecting column (9) is provided with through holes (17) corresponding to the number of nuts (8), an oil injection mechanism is provided between the through holes (17) and the interior of the nut (8), and the inner side wall of the nut (8) is provided with a group of oil outlet holes (20).

6. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 5, characterized in that: The oil injection mechanism comprises a round tube (18) connected to the through hole (17), a second conduit (19) is connected inside the round tube (18), a fixing ring (21) is rotatably connected to the top end of the nut (8), the bottom end of the fixing ring (21) is open, and the bottom end of the fixing ring (21) extends into the interior of the nut (8), and an end of the second conduit (19) away from the round tube (18) is connected to the interior of the connecting ring.

7. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 6, characterized in that: The connecting column (9) is provided with an annular slide groove (22) connected to the through hole (17); a sealing ring (23) is slidably connected in the annular slide groove (22) for sealing the through hole (17); a circular hole (25) corresponding to the through hole (17) is provided on the sealing ring (23); and a driving component for driving the sealing ring (23) to move is provided in the cylinder (10).

8. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 7, characterized in that: The driving assembly comprises a magnetic ring (24) fixedly connected to the bottom surface of the cylinder (10); the sealing ring (23) is made of a magnetic material that is magnetically attracted to the magnetic ring (24); and a group of third springs are fixedly connected between one end of the sealing ring (23) away from the magnetic ring (24) and the inner wall of the slide groove (22).

9. The electric heater connection device for in-situ thermal desorption electric heating of soil according to claim 8, characterized in that: A rotation groove is provided at one end of the cylinder (10) away from the connecting column (9), a round rod (26) is sealingly and rotatably connected to the inner wall of the rotation groove, a torsion spring is provided between the side wall of the round rod (26) and the rotation groove, a group of connecting holes are provided on the round rod (26), a funnel is fixedly connected to one end of the round rod (26) away from the connecting column (9), a circular groove (28) is provided at one end of the cylinder (10) away from the funnel, and a group of connecting grooves (27) corresponding to the connecting holes are provided between the circular groove (28) and the rotation groove.

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