A portable roof lightning protection grounding grid grounding resistance detection device

Abstract

The present invention discloses a portable grounding resistance detection device for a roof lightning protection grounding grid, which belongs to the field of grounding resistance detection technology. The device comprises a detector, a connecting line, an alligator clip and a detection rod. The bottom of the detection rod is movably sleeved with a telescopic sleeve, and the bottom of the telescopic sleeve is movably sleeved with a probe rod. The present invention adopts a telescopic design of the detection rod, the telescopic sleeve and the probe rod, which are convenient for unified storage and carrying. During the detection process, through the movably sleeved connection between the detection head and the probe rod, and the design of pressure amplification and transmission between the pressure chamber and the detection chamber, the movement of the piston block can make detection feedback on the stress encountered by the insertion into the soil. Moreover, during the insertion process, when the resistance encountered is too large, the piston block can be used to connect the pressure chamber and the transmission chamber, driving the telescopic claw to rotate and expand, thereby increasing the stress dispersion effect during insertion, achieving an automatic protection effect on the detection rod, the telescopic sleeve and the probe rod, and avoiding bending caused by excessive stress.

Description

Technical Field

[0001] The present invention relates to the technical field of grounding resistance detection, in particular to a portable grounding resistance detection device for a roof lightning protection grounding grid. Background Art

[0002] The introduction of grounding technology was originally a protective measure to prevent electrical or electronic equipment from being struck by lightning. The purpose was to introduce the lightning current generated by lightning into the earth through lightning rods, thereby protecting buildings. Grounding resistance is an important parameter used to measure whether the grounding state is good. It is the resistance encountered by the current flowing from the grounding device into the earth and then through the earth to another grounding body or spreading to a distant place.

[0003] The current existing technology mainly adopts the three-level ground resistance detection method. The grounding part detection mainly adopts the probe to insert into the soil for detection. However, the surface area of ​​the traditional probe is small, the detection contact area is small, and the soil cannot be detected during the detection process. When the soil hardness is high, the probe is easily bent and damaged when forced into the soil. When there are cavities inside the soil, it will lead to the loss of effective contact area, affecting the overall detection results.

[0004] How to invent a portable roof lightning protection grounding grid grounding resistance detection device to improve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In order to make up for the above shortcomings, the present invention provides a portable roof lightning protection grounding grid grounding resistance detection device, which aims to improve the problems raised by the above background technology.

[0006] The present invention is achieved in that:

[0007] The present invention provides a portable grounding resistance detection device for a roof lightning protection grounding grid, comprising a detector, a connecting line, an alligator clip, and a detection rod. A telescopic sleeve is movably sleeved at the bottom of the detection rod, a probe rod is movably sleeved at the bottom of the telescopic sleeve, a detection mechanism and an expansion mechanism are provided inside the probe rod, a clamping mechanism is provided between the telescopic sleeve and the probe rod, and a fixing mechanism is provided on the outer side wall of the detection rod.

[0008] The detection mechanism includes a pressure chamber provided at the bottom of the probe rod, a detection head movably sleeved on the pressure chamber, a spring provided between the detection head and the probe rod, a detection chamber and a transmission chamber connected from bottom to top provided inside the probe rod, the detection chamber being connected to the pressure chamber, a piston block sleeved on the inside of the detection chamber, a spring provided between the piston block and the detection chamber, a switch 1 and a switch 2 provided on the bottom and top of the inner side of the detection chamber in sequence, a piston rod sleeved on the inside of the transmission chamber, a connecting pipe connecting the pressure chamber and the detection chamber provided inside the probe rod, and a return pipe provided inside the probe rod;

[0009] The clamping mechanism includes a clamping block three arranged on the outer wall of the probe rod, a spring is arranged between the clamping block three and the probe rod, a clamping block four is sleeved on the side wall of the telescopic sleeve, a spring is arranged between the clamping block four and the telescopic sleeve, and the clamping block four and the clamping block three are designed to cooperate with each other.

[0010] Preferably, the interiors of the pressure chamber and the detection chamber are filled with hydraulic oil, and the inner diameter of the pressure chamber is larger than the inner diameters of the detection chamber and the transmission chamber.

[0011] Preferably, the piston block is a two-stage design, with a sealed movable sleeve design between the two sections of the piston block, and a spring is provided at the connection. A group of L-shaped tubes that match the connecting pipe are opened inside the piston block to connect the connecting pipe with the detection chamber.

[0012] Preferably, the expansion mechanism includes a telescopic claw uniformly opened along the ring on the side wall of the probe rod, the telescopic claw and the probe rod are rotatably connected by a rotating shaft, the rotating shaft of the telescopic claw is connected to a gear, the interior of the probe rod is sleeved with a transmission shaft, the side wall of the transmission shaft is connected to a rack meshing with the gear, the top of the transmission shaft is connected to a group of connecting ropes extending to the inside of the detection rod, and the top of the piston rod extends to close to the bottom of the transmission shaft.

[0013] Preferably, a side of the telescopic claw away from the probe rod is provided with an oblique angle.

[0014] Preferably, the fixing mechanism includes a fixing ring which is sleeved on the outer wall of the detection rod, an insert block is provided at the bottom of the fixing ring, a clamping block 1 is movably sleeved on the outer wall of the insert block, a spring is connected between the clamping block 1 and the insert block, a pressure block is sleeved on the inner side of the insert block, a push block is sleeved on the bottom of the fixing ring, a spring is connected between the push block and the fixing ring, a clamping block 2 which cooperates with the push block is sleeved on the outer wall of the detection rod, and a spring is provided between the clamping block 2 and the detection rod.

[0015] Preferably, the top end of the connecting rope extends through the detection rod via a guide wheel arranged inside the probe rod and is finally connected to the bottom of the fixing ring.

[0016] Preferably, the bottom of the pressing block is provided with an oblique angle, and the top of the first clamping block is provided with a chamfered angle that matches the pressing block.

[0017] In summary, the beneficial effects of the present invention are:

[0018] 1. The detection rod, telescopic sleeve and probe rod are designed with a telescopic design, which is convenient for unified storage and carrying. At the same time, during the detection process, through the movable socket connection between the detection head and the probe rod, and the design of pressure amplification and transmission between the pressure chamber and the detection chamber, the movement of the piston block can provide detection feedback on the stress of the soil when inserted. Moreover, during the insertion process, if the resistance is too large, the pressure chamber and the transmission chamber can be connected through the piston block, driving the telescopic claw to rotate and expand, increasing the stress dispersion effect during insertion, and realizing the automatic protection effect of the detection rod, telescopic sleeve and probe rod, avoiding bending caused by excessive stress.

[0019] 2. During the insertion detection process, the plug is inserted into the soil surface and is fixed and self-locked on the soil surface by extending the card block. When the detection rod is inserted to the end, the relative movement of the fixed ring and the detection rod is further driven by the connecting rope to rotate and expand the telescopic claw, thereby achieving self-locking deep in the soil. At the same time, it can increase the detection contact area, enhance the electrical contact stability between the contact point and the detection soil, realize a multi-point contact network to expand the data collection density, reduce local interference, and have good stability during detection, covering the stable detection needs of various media soils such as loose, sticky, and hard. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a front schematic diagram of the detector provided by the embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the back of the detector provided by the embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of the detection rod provided by an embodiment of the present invention when it is completely retracted.

[0024] Figure 4 This is a schematic diagram of the detection rod provided by an embodiment of the present invention when it is fully extended.

[0025] Figure 5 It is a schematic diagram of the interior of the detection rod provided by the embodiment of the present invention when it is extended.

[0026] Figure 6 It is an overall schematic diagram of the detection mechanism provided by the embodiment of the present invention.

[0027] Figure 7It is an overall schematic diagram of the expansion mechanism provided in an embodiment of the present invention.

[0028] Figure 8 It is an overall schematic diagram of the clamping mechanism provided in an embodiment of the present invention.

[0029] Figure 9 2 is a schematic diagram of the interior of a fixing ring provided in an embodiment of the present invention.

[0030] Figure 10 It is an overall schematic diagram of a card block provided in an embodiment of the present invention.

[0031] Figure 11 It is an overall schematic diagram of the card block 2 provided in an embodiment of the present invention.

[0032] Legend:

[0033] 100. Detector; 101. Connecting wire; 102. Alligator clip; 200. Detection rod; 201. Telescopic sleeve; 202. Probe rod; 203. Detection head; 204. Pressure chamber; 205. Detection chamber; 206. Transmission chamber; 207. Piston rod; 208. Piston block; 209. Connecting pipe; 210. Return pipe; 211. Switch 1; 212. Switch 2; 300. Fixing ring; 301. Pressing block; 302. Clamping block 1; 303. Pushing block; 304. Clamping block 2; 305. Inserting block; 400. Transmission shaft; 401. Rack; 402. Telescopic claw; 403. Gear; 404. Connecting rope; 500. Clamping block 3; 501. Clamping block 4. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] Reference Figure 1-11The present invention provides a portable roof lightning protection grounding grid grounding resistance detection device, including a detector 100, a connecting line 101, an crocodile clip 102 and a detection rod 200, the bottom of the detection rod 200 is movably connected with a telescopic sleeve 201, the bottom of the telescopic sleeve 201 is movably connected with a probe rod 202, a detection mechanism and an expansion mechanism are arranged inside the probe rod 202, a clamping mechanism is arranged between the telescopic sleeve 201 and the probe rod 202, and a fixing mechanism is arranged on the outer wall of the detection rod 200; it should be noted that a card slot and a storage slot are arranged inside the detector 100 for storing and storing the connecting line 101, the crocodile clip 102 and the detection rod 200.

[0036] The detection mechanism includes a pressure chamber 204 provided at the bottom of the probe rod 202, the pressure chamber 204 is movably connected to the detection head 203, a spring is provided between the detection head 203 and the probe rod 202, the probe rod 202 has a detection chamber 205 and a transmission chamber 206 connected from bottom to top, the detection chamber 205 is connected to the pressure chamber 204, a piston block 208 is connected to the inside of the detection chamber 205, a spring is provided between the piston block 208 and the detection chamber 205, a switch 1 211 and a switch 212 are provided at the bottom and top of the inner side of the detection chamber 205, and a movable detection chamber 205 is provided inside the transmission chamber 206. The plug rod 207 is provided with a spring between the piston rod 207 and the transmission chamber 206. A connecting pipe 209 is provided inside the probe rod 202 to connect the pressure chamber 204 and the detection chamber 205. A return pipe 210 is provided inside the probe rod 202 to connect the pressure chamber 204 and the transmission chamber 206. A one-way valve is provided inside the return pipe 210 to allow the hydraulic oil in the transmission chamber 206 to flow back to the pressure chamber 204 to achieve reset and balance. The switch 1 211 and the switch 2 212 are touch switches, and the switch 1 211 and the switch 2 212 are electrically connected to the detector 100.

[0037] The clamping mechanism includes a clamping block 3 500 arranged on the outer wall of the probe rod 202, a spring is arranged between the clamping block 3 500 and the probe rod 202, a clamping block 4 501 is sleeved on the side wall of the telescopic sleeve 201, a spring is arranged between the clamping block 4 501 and the telescopic sleeve 201, and the clamping block 4 501 and the clamping block 3 500 are designed to cooperate with each other; it should be noted that the same clamping mechanism is also arranged between the detection rod 200 and the telescopic sleeve 201, and the two sets of clamping mechanisms have the same function. , are used to fix the telescopic sleeve 201 and the probe rod 202 when they are extended, so as to facilitate their deployment and insertion into the soil. When the probe rod 202 needs to be retracted, just press the card block four 501 and push the probe rod 202 back. At this time, since the card block four 501 pushes the card block three 500 back to the inside of the probe rod 202, the card connection between the telescopic sleeve 201 and the probe rod 202 is lost, and the probe rod 202 can be pushed back to the inside of the telescopic sleeve 201.

[0038] Furthermore, the interior of the pressure chamber 204 and the detection chamber 205 is filled with hydraulic oil, and the inner diameter of the pressure chamber 204 is larger than the inner diameters of the detection chamber 205 and the transmission chamber 206; it should be noted that, through the difference in the inner diameters of the pressure chamber 204, the detection chamber 205 and the transmission chamber 206, when the detection head 203 moves inside the pressure chamber 204, the corresponding changes in the amount of hydraulic oil inside the detection chamber 205 and the transmission chamber 206 can push the piston block 208 and the piston rod 207 to move a greater distance, thereby amplifying the detection results.

[0039] It should be noted that the piston block 208 is a two-stage design, and a sealed movable sleeve design is adopted between the two sections of the piston block 208, and a spring is provided at the connection. A group of L-shaped tubes cooperating with the connecting tube 209 are opened inside the piston block 208, which are used to connect the connecting tube 209 with the detection chamber 205, and a group of movable tubes are provided inside the piston block 208, which are used to maintain the connection of the internal L-shaped tube when the two sections of the piston block 208 move. Through the two-stage elastic design of the piston block 208, when the detection head 203 drives the internal pressure of the pressure chamber 204 to change, the pressure is first adjusted by the movement of the lower half of the piston block 208, and the piston rod 207 will not change accordingly. Only when the pressure on the lower half of the piston block 208 is too large, the piston block 208 moves up as a whole and makes the connecting tube 209 connected to the transmission chamber 206 through the L-shaped tube inside the piston block 208, and the piston rod 207 will be affected by the internal pressure of the pressure chamber 204.

[0040] Reference Figure 1-7 The expansion mechanism includes a telescopic claw 402 uniformly opened along the ring on the side wall of the probe rod 202, the telescopic claw 402 and the probe rod 202 are rotatably connected by a rotating shaft, the rotating shaft of the telescopic claw 402 is connected to a gear 403, the interior of the probe rod 202 is sleeved with a transmission shaft 400, the side wall of the transmission shaft 400 is connected to a rack 401 meshing with the gear 403, the top of the transmission shaft 400 is connected to a set of connecting ropes 404 extending to the inside of the detection rod 200, and the top of the piston rod 207 extends to close to the bottom of the transmission shaft 400; it should be noted that the detection rod 200, the telescopic sleeve 201, the probe rod 202 and the telescopic claw 402 are all made of conductive materials and are connected to the top interface of the detection rod 200 through a wire, and finally the detected electrical signal is transmitted to the inside of the detector 100 through the connecting line 101.

[0041] Furthermore, a bevel is provided on the side of the telescopic claw 402 away from the probe rod 202, which can break the soil when deployed, facilitate the deployment of the telescopic claw 402, and reduce deployment resistance.

[0042] Reference Figure 9-10The fixing mechanism includes a fixing ring 300 sleeved on the outer wall of the detection rod 200, a plug block 305 is provided at the bottom of the fixing ring 300, a clamping block 302 is movably sleeved on the outer wall of the plug block 305, a spring is connected between the clamping block 302 and the plug block 305, a pressure block 301 is sleeved on the inner side of the plug block 305, a push block 303 is sleeved on the bottom of the fixing ring 300, a spring is connected between the push block 303 and the fixing ring 300, a clamping block 2 304 that cooperates with the push block 303 is sleeved on the outer wall of the detection rod 200, and a spring is provided between the clamping block 2 304 and the detection rod 200.

[0043] Furthermore, the top end of the connecting rope 404 extends through the detection rod 200 via a guide wheel provided inside the probe rod 202 and is finally connected to the bottom of the fixing ring 300 .

[0044] It should be noted that the bottom of the pressing block 301 is provided with an oblique angle, and the top of the clamping block 302 is provided with a chamfered angle that matches the pressing block 301.

[0045] The working process of the portable roof lightning protection grounding grid grounding resistance detection device is as follows:

[0046] During testing, take out the connecting wire 101, the crocodile clip 102 and the testing rod 200, connect the crocodile clip 102 and the testing rod 200 to the detector 100 respectively through the connecting wire 101, then fix the crocodile clip 102 to the exposed part of the grounded metal to be tested, and unfold the remaining two sets of testing rods 200 and ground them.

[0047] When performing the grounding work, first pull the probe rod 202 and the telescopic sleeve 201 out to the extreme position. When the probe rod 202 is pulled out to the extreme position, the clamping block 3 500 just extends out and engages with the telescopic sleeve 201. At the same time, the clamping block 4 501 also corresponds to the position of the clamping block 3 500. Through the engagement of the clamping block 3 500 with the telescopic sleeve 201, the probe rod 202 can be engaged and fixed with the telescopic sleeve 201. Similarly, the detection rod 200 and the telescopic sleeve 201 are also unfolded and fixed in this way, so that the telescopic sleeve 201 and the probe rod 202 can be quickly unfolded and fixed, and then a suitable position and soil are selected for insertion and testing.

[0048] During the insertion process of the soil, the sharp design of the bottom of the detection head 203 can break through the surface layer and insert deep into the soil. As the detection head 203, the probe rod 202 and the telescopic sleeve 201 are inserted, when the detection rod 200 is inserted into the soil, the detection rod 200 penetrates into the soil until the bottom of the plug block 305 contacts the soil, and continues to be inserted. The oblique angle of the bottom of the plug block 305 can facilitate the breaking of the soil surface layer and the insertion of the soil. When the detection rod 200 and the plug block 305 continue to be inserted until the bottom of the push block 303 contacts the soil surface, the soil surface pushes the push block 303 toward the inside of the fixing ring 300, and the oblique angle of the clamping block 304 pushes the clamping block 304 toward the inside of the detection rod 200, so that the clamping connection of the clamping block 304 between the fixing ring 300 and the detection rod 200 is lost, thereby making the detection rod When 200 continues to be inserted, the fixing ring 300 and the insert block 305 stay on the surface of the soil and no longer continue to penetrate with the detection rod 200. The detection rod 200 continues to penetrate until the top of the detection rod 200 contacts the pressure block 301 and pushes the pressure block 301, causing the pressure block 301 to sink. Through the coordination of the bevel angle at the bottom of the pressure block 301 and the bevel angle at the top of the clamping block 302, a circle of clamping blocks 302 around the insert block 305 are extended synchronously, increasing the contact area between the insert block 305 and the soil, improving the stress dispersion effect, increasing the contact and fixation stability of the detection rod 200 and the soil, improving the overall anti-drift effect of the detection rod 200, and can improve the adhesion and gripping effect with the soil, especially sandy or clay soil, reduce the device fluctuation caused by the soil, and thus improve the accuracy of the overall detection.

[0049] In the above-mentioned process of inserting soil detection, after the fixing ring 300 is disengaged from the locking connection with the detection rod 200, as the detection rod 200 continues to be inserted, the detection rod 200 and the fixing ring 300 move relative to each other under the obstruction of the soil, and the fixing ring 300 moves upward relative to the detection rod 200, thereby pulling the connecting rope 404, further driving the transmission shaft 400 to move upward, causing the rack 401 to move upward, and the engagement of the rack 401 and the gear 403 drives the gear 403 and the telescopic claw 402 to rotate, so that when the detection rod 200 is inserted to the end, the telescopic claw 402 can be driven to automatically expand, which can not only cooperate with the insertion block 305, but also above the detection rod 200 and the probe rod Two sets of self-locking structures are formed under 202 to improve the fixing effect during detection, the anti-drift effect, and the stress dispersion effect, and the stability of the device detection. Moreover, by unfolding the telescopic claw 402, the detection contact area with the soil can be increased in the detection area. The telescopic claw 402 adopts surface laser-etched micro-grooves combined with a conductive coating to enhance the electrical contact stability between the contact and the detection soil. Compared with traditional probe-type detection, it can significantly improve the signal transmission efficiency. Not only can it expand the data collection density and reduce local interference by increasing the contact area and realizing a multi-point contact network, but it also has good stability during detection, covering the stable detection needs of various media soils such as loose, sticky, and hard.

[0050] Furthermore, during the insertion of the probe rod 202 and the detection head 203 into the soil, if the detected area is a soil cavity area, the soil pressure on the detection head 203 is small, and the detection head 203 moves away from the probe rod 202 under the action of the elastic force. The detection head 203 moves downward, driving the piston block 208 to move downward, triggering the switch 1 211. Through the detector 100, it can be concluded that this is a loose soil cavity area, so that the detection point can be changed to reduce the interference effect of the soil and ensure the accuracy of the detection. During the insertion of the probe rod 202 into the soil, if the hardness and density of the soil layer are too high, the detection head 203 is subjected to excessive pressure between the probe rod 202 and the soil, causing the detection head 203 to move toward the probe rod 202, compressing the hydraulic oil in the pressure chamber 204. After being pressurized, the hydraulic oil in the pressure chamber 204 enters the detection chamber 205 and pushes the piston block 208 upward. The lower half of the piston block 208 moves upward under the action of the pressure, causing the spring between the two groups of piston blocks 208 to be compressed. When the pressure on the head 203 continues to increase, the hydraulic pressure inside the pressure chamber 204 continues to push the piston block 208 up until the lower piston block 208 is in close contact with the upper piston block 208 and moves up synchronously, pushing the trigger switch 212, and the detector 100 reminds that the pressure is too high. At the same time, the L-shaped tube inside the piston block 208 is connected to the connecting pipe 209 through the lower half of the piston block 208, and the hydraulic pressure enters the transmission chamber 206 through the connecting pipe 209, pushing the piston rod 207 up. The piston rod 207 moves upward to push the transmission shaft 400 upward, thereby driving the telescopic claw 402 to rotate and expand, so that when the detection head 203 is subjected to excessive pressure, an alarm is issued through the switch 212. At the same time, through the transmission and connection of the piston block 208, the piston rod 207 is pushed upward to drive the telescopic claw 402 to rotate and expand, thereby increasing the stress dispersion effect during insertion, realizing the automatic protection effect of the detection rod 200, the telescopic sleeve 201 and the probe rod 202, and avoiding bending caused by excessive stress.

[0051] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A portable roof lightning protection grounding grid grounding resistance detection device, comprising a detector (100), a connecting line (101), an alligator clip (102) and a detection rod (200), characterized in that: The bottom of the detection rod (200) is movably sleeved with a telescopic sleeve (201), the bottom of the telescopic sleeve (201) is movably sleeved with a probe rod (202), a detection mechanism and an expansion mechanism are provided inside the probe rod (202), a clamping mechanism is provided between the telescopic sleeve (201) and the probe rod (202), and a fixing mechanism is provided on the outer side wall of the detection rod (200); The detection mechanism comprises a pressure chamber (204) provided at the bottom of the probe rod (202), a detection head (203) being movably sleeved in the pressure chamber (204), a spring being provided between the detection head (203) and the probe rod (202), a detection chamber (205) and a transmission chamber (206) being connected from bottom to top in the interior of the probe rod (202), the detection chamber (205) being in communication with the pressure chamber (204), a piston block (208) being sleeved in the interior of the detection chamber (205), and a plurality of pistons (209) being provided in the piston rod (208). ), a spring is provided between the piston block (208) and the detection chamber (205), a switch 1 (211) and a switch 2 (212) are provided on the inner bottom and top of the detection chamber (205) in sequence, a piston rod (207) is sleeved inside the transmission chamber (206), a connecting pipe (209) is provided inside the probe rod (202) to connect the pressure chamber (204) and the detection chamber (205), and a return pipe (210) is provided inside the probe rod (202); The clamping mechanism comprises a clamping block three (500) arranged on the outer side wall of the probe rod (202), a spring is arranged between the clamping block three (500) and the probe rod (202), a clamping block four (501) is sleeved on the side wall of the telescopic sleeve (201), a spring is arranged between the clamping block four (501) and the telescopic sleeve (201), and the clamping block four (501) and the clamping block three (500) are designed to cooperate with each other.

2. A portable roof lightning protection grounding grid grounding resistance detection device according to claim 1, characterized in that: The interiors of the pressure chamber (204) and the detection chamber (205) are filled with hydraulic oil, and the inner diameter of the pressure chamber (204) is larger than the inner diameters of the detection chamber (205) and the transmission chamber (206).

3. A portable roof lightning protection grounding grid grounding resistance detection device according to claim 1, characterized in that: The piston block (208) is designed in two sections, and a sealed movable sleeve design is adopted between the two sections of the piston block (208), and a spring is provided at the connection. A group of L-shaped tubes that match the connecting tube (209) are opened inside the piston block (208) for connecting the connecting tube (209) with the detection chamber (205).

4. A portable roof lightning protection grounding grid grounding resistance detection device according to claim 1, characterized in that: The expansion mechanism includes a telescopic claw (402) uniformly opened along a ring on the side wall of the probe rod (202), the telescopic claw (402) and the probe rod (202) are rotatably connected by a rotating shaft, the rotating shaft of the telescopic claw (402) is connected to a gear (403), the interior of the probe rod (202) is sleeved with a transmission shaft (400), the side wall of the transmission shaft (400) is connected to a rack (401) meshing with the gear (403), the top of the transmission shaft (400) is connected to a group of connecting ropes (404) extending to the inside of the detection rod (200), and the top of the piston rod (207) extends to close to the bottom of the transmission shaft (400).

5. A portable roof lightning protection grounding grid grounding resistance detection device according to claim 4, characterized in that: The telescopic claw (402) is provided with an oblique angle on a side away from the probe rod (202).

6. A portable roof lightning protection grounding grid grounding resistance detection device according to claim 4, characterized in that: The fixing mechanism comprises a fixing ring (300) sleeved on the outer wall of the detection rod (200), an inserting block (305) is provided at the bottom of the fixing ring (300), a clamping block (302) is movably sleeved on the outer wall of the inserting block (305), a spring is connected between the clamping block (302) and the inserting block (305), a pressure block (301) is sleeved on the inner side of the inserting block (305), a push block (303) is sleeved on the bottom of the fixing ring (300), a spring is connected between the push block (303) and the fixing ring (300), a clamping block (304) matching the push block (303) is sleeved on the outer wall of the detection rod (200), and a spring is provided between the clamping block (304) and the detection rod (200).

7. A portable roof lightning protection grounding grid grounding resistance detection device according to claim 6, characterized in that: The top end of the connecting rope (404) extends through the detection rod (200) via a guide wheel arranged inside the probe rod (202) and is finally connected to the bottom of the fixing ring (300).

8. A portable roof lightning protection grounding grid grounding resistance detection device according to claim 6, characterized in that: The bottom of the pressing block (301) is provided with an oblique angle, and the top of the clamping block (302) is provided with a chamfered angle that matches the pressing block (301).

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