Electrical grounding resistance detection device for constructional engineering

Abstract

The invention relates to the technical field of resistance detection, in particular to a constructional engineering electrical grounding resistance detection device which comprises a resistance detection box, a plurality of wiring terminals are arranged in the resistance detection box, detection lines are inserted into the wiring terminals, a winding cavity is formed in the resistance detection box, and two guide wheels are rotationally connected to the side wall of the winding cavity. A tensioning wheel is arranged between the two guide wheels, an elastic telescopic rod is fixed between a mounting seat of the tensioning wheel and the inner wall of the winding cavity, and in the pulling process, when the elastic telescopic rod is used for shrinking and avoiding, a piston pushes gas in a fixed cylinder to a flow guide pipe and discharges the gas to an air bag through the flow guide pipe, so that the air bag is inflated to expand and extrudes a wire, and the wire is wound. And the clamping force on the detection line is increased, so that the stability of the detection line is ensured when the detection line is pulled.

Description

Technical Field

[0001] The invention relates to the field of resistance detection, and in particular to a construction engineering electrical grounding resistance detection device. Background Art

[0002] Electrical ground resistance detection is a key link in ensuring the safe operation of electrical systems. It relies on professional instruments such as ground resistance testers. The instruments are connected, calibrated and measured according to the correct steps, and the ground resistance value is obtained by taking the average value through multiple measurements.

[0003] When conducting ground resistance detection, the detection line is relatively long, some are ten meters, twenty meters or forty meters. Due to the long detection line, the wire may be pulled during the detection process, causing the connection part to loosen. For example, during the line laying process, the detection line needs to be pulled frequently, and the end of the detection line is plugged into the resistance detection box. During the pulling process, the plug-in position is repeatedly stressed, which is prone to fatigue effect. Even if the force is applied each time within a seemingly reasonable range, the stability of the connection will decrease as the number of times increases, making it easier to loosen, and structures such as the wires at the bends are also more easily damaged. For another example, during the detection process, the detection line may be touched or kicked by people passing by, causing the wire to be pulled loose, etc. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a construction engineering electrical grounding resistance detection device.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: an electrical grounding resistance detection device for construction engineering, comprising a resistance detection box, a plurality of wiring terminals are arranged inside the resistance detection box, a detection line is plugged into the wiring terminals, a winding cavity is arranged inside the resistance detection box, two guide wheels are rotatably connected to the side wall of the winding cavity, a tensioning wheel is arranged between the two guide wheels, an elastic telescopic rod is fixed between the mounting seat of the tensioning wheel and the inner wall of the winding cavity, the elastic telescopic rod comprises a fixed cylinder and a movable rod, the fixed cylinder is fixed on On the side wall of the winding cavity, the movable rod is fixed on the mounting seat of the tensioning wheel, the movable rod is inserted into the fixed cylinder, a piston is fixed on the end of the movable rod, an elastic component is arranged inside the fixed cylinder, a clamping component is arranged on one side of the terminal, the clamping component includes a fixed wheel and a movable wheel, a fixed rod is fixed between the fixed wheel and the resistance detection box, an electric push rod is fixed between the movable wheel and the resistance detection box, an airbag is sleeved on the fixed wheel, a guide tube is fixedly connected to the side wall of the fixed cylinder, and the guide tube is connected to the inside of the airbag.

[0006] Preferably, the elastic component includes a support frame and a pressure sensor, the support frame is fixed on the inner wall of the fixed cylinder, the pressure sensor is fixed on the support frame, and a first spring is arranged between the pressure sensor and the piston.

[0007] Preferably, a regulating valve is inserted and fixed on the side wall of the fixed cylinder, and the regulating valve includes a valve cylinder with openings at both ends, and a plurality of air permeable grooves are evenly opened in the middle of the valve cylinder, one end of the valve cylinder is connected to the outside, and the other end of the valve cylinder is connected to the guide pipe, and a first sealing plate and a second sealing plate are slidably connected in the openings at both ends of the valve cylinder, respectively, a bracket is fixed on the inner wall of the valve cylinder, and a sliding rod is slidably inserted on the bracket, and both ends of the sliding rod are respectively fixed on the surfaces of the first sealing plate and the second sealing plate, and a second spring is fixed between the bracket and the first sealing plate.

[0008] Preferably, the valve cylinder includes a straight cylinder and a conical cylinder, the straight cylinder is arranged on a side close to the guide tube, the small end of the conical cylinder is fixedly connected to the straight cylinder, the large end of the conical cylinder is connected to the outside, and the air permeable groove is opened on the outer wall of the conical cylinder.

[0009] Preferably, a plurality of exhaust grooves are provided on the side wall of the cone cylinder, filter cotton is filled and fixed in the exhaust grooves, and a limiting block is fixed on the inner wall of the cone cylinder.

[0010] Preferably, a through hole is formed on an outer wall of one side of the second sealing plate close to the interior of the valve cylinder, the through hole is communicated with the outside, and an elastic membrane is fixed on the inner wall of the through hole.

[0011] Preferably, a blocking plate is fixed on one side of the second sealing plate, a sealing bag is fixed on the outer annular surface of the second sealing plate, and the sealing bag is connected with the inside of the through hole through a pipeline.

[0012] Preferably, a sealing ring is sleeved and fixed on the outer wall of the first sealing plate, the sealing ring has a first port and a second port, the inner diameter of the second port is larger than the inner diameter of the first port, and the second port is arranged on a side close to the second spring.

[0013] Preferably, the surface of the resistance detection box is rotatably connected to a plurality of groups of guide posts, each group of the guide posts has two guide posts, and the two guide posts are symmetrically arranged on both sides of the clamping position.

[0014] Compared with the prior art, the present invention has the following beneficial effects: First, during the pulling process, when the elastic telescopic rod contracts and makes way, the piston pushes the gas in the fixed cylinder to the guide tube, and discharges it to the airbag through the guide tube, so that the airbag is inflated and expands and squeezes the wire, increasing the clamping force on the detection line, thereby ensuring the stability of the detection line when it is pulled. Secondly, when the pulling force is greater, the greater the contraction distance of the elastic telescopic rod, the greater the expansion degree of the airbag, so that the squeezing force of the airbag on the detection line can be automatically adjusted and adapted according to the magnitude of the pulling force, thereby avoiding the situation where the wire is continuously subjected to a large squeezing force, resulting in the deformation of the detection line for too long, affecting the detection result.

[0015] Second, when the airbag does not continue to expand, the gas in the fixed tube can be directly discharged to the outside, thereby ensuring the normal telescopic function of the elastic telescopic rod, and the connecting position between the guide tube and the valve tube is sealed synchronously through the first sealing plate, which is conducive to ensuring the normal extrusion state of the airbag and preventing the gas in the airbag from flowing out from the valve tube position, affecting the extrusion effect, causing the plug-in position to loosen, and affecting the detection result.

[0016] 3. During the detection process, slight shaking may occur due to wind blowing or other circumstances, causing the elastic telescopic rod to shrink and stretch in a small range with a high frequency, thereby causing the airbag to be repeatedly inflated and deflated, and the clamping part of the detection line to continue to be squeezed back and forth. The reciprocating deformation of the detection line may have an adverse effect on the detection result. In order to reduce this adverse effect, this embodiment arranges an elastic membrane, and the material of the elastic membrane is easier to deform than the airbag. Therefore, when the elastic telescopic rod shrinks, the elastic membrane can deform first and sink outward, thereby increasing the internal space of the valve cylinder and providing space for the gas to make way, thereby avoiding the repeated expansion and contraction of the airbag to squeeze the detection line, which is beneficial to ensure the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0018] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0019] Figure 3 It is a schematic diagram of the guide wheel, tension wheel and fixed wheel structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the fixed wheel of the present invention.

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the fixed cylinder and the movable rod of the present invention.

[0022] Figure 6It is a schematic diagram of the cross-sectional structure of the fixing tube of the present invention.

[0023] Figure 7 It is a schematic diagram of the cross-sectional structure of the valve cylinder of the present invention.

[0024] Figure 8 It is a schematic diagram of the straight tube and tapered tube structure of the present invention.

[0025] Fig. 9 It is a schematic diagram of the structure of the second sealing plate of the present invention.

[0026] Fig.10 It is a schematic structural diagram of the first sealing plate of the present invention.

[0027] In the figure: 1. resistance detection box; 2. terminal block; 3. detection line; 4. winding cavity; 5. guide wheel; 6. tension wheel; 7. elastic telescopic rod; 8. fixed cylinder; 9. movable rod; 10. piston; 11. fixed wheel; 12. movable wheel; 13. fixed rod; 14. electric push rod; 15. air bag; 16. guide tube; 17. support frame; 18. pressure sensor; 19. first spring; 20. valve cylinder; 21. air permeable groove; 22. first sealing plate; 23. second sealing plate; 24. bracket; 25. slide rod; 26. second spring; 27. straight cylinder; 28. cone cylinder; 29. ​​exhaust groove; 30. filter cotton; 31. limit block; 32. through hole; 33. elastic membrane; 34. blocking plate; 35. sealing bag; 36. pipeline; 37. sealing ring; 38. first port; 39. second port; 40. guide column. DETAILED DESCRIPTION

[0028] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0029] like Figures 1 to 10The electrical grounding resistance detection device for construction engineering shown in the figure comprises a resistance detection box 1, a plurality of wiring terminals 2 are arranged inside the resistance detection box 1, a detection line 3 is plugged into the wiring terminal 2, a winding cavity 4 is arranged inside the resistance detection box 1, two guide wheels 5 are rotatably connected to the side wall of the winding cavity 4, a tensioning wheel 6 is arranged between the two guide wheels 5, an elastic telescopic rod 7 is fixed between the mounting seat of the tensioning wheel 6 and the inner wall of the winding cavity 4, the elastic telescopic rod 7 comprises a fixed cylinder 8 and a movable rod 9, the fixed cylinder 8 is fixed to the side wall of the winding cavity 4, and the movable rod 9 is fixed to the side wall of the winding cavity 4. It is fixed on the mounting seat of the tensioning wheel 6, and the movable rod 9 is inserted into the fixed cylinder 8. A piston 10 is fixed to the end of the movable rod 9. An elastic component is arranged inside the fixed cylinder 8. A clamping component is arranged on one side of the terminal 2. The clamping component includes a fixed wheel 11 and a movable wheel 12. A fixed rod 13 is fixed between the fixed wheel 11 and the resistance detection box 1, and an electric push rod 14 is fixed between the movable wheel 12 and the resistance detection box 1. An air bag 15 is sleeved on the fixed wheel 11. A guide tube 16 is fixedly connected to the side wall of the fixed cylinder 8, and the guide tube 16 is connected to the inside of the air bag 15.

[0030] Specifically, when performing ground resistance detection, the detection line 3 is relatively long, such as ten meters, twenty meters or forty meters. Since the detection line 3 is relatively long, the wire may be pulled during the detection process, resulting in loosening of the connection part. For example, during the wire laying process, the detection line 3 needs to be pulled frequently, and the end of the detection line 3 is plugged into the resistance detection box 1. During the pulling process, the plug-in position is repeatedly stressed, which is prone to fatigue effect. Even if the force is applied each time within a seemingly reasonable range, as the number of times increases, the stability of the connection will decrease, and it will become more and more likely to loosen, and structures such as the wires at the bends will also be more easily damaged. For another example, during the detection process, the detection line 3 may be bumped or kicked by people passing by, resulting in the wire being pulled and loosened. The present invention can solve the above problems. The above problem is solved in a specific way. When releasing the wire, the electric push rod 14 is first started to descend, so that the distance between the fixed wheel 11 and the movable wheel 12 is increased, which is convenient for putting in the detection wire 3. Then, the detection wire 3 is put in between the fixed wheel 11 and the movable wheel 12, and the electric push rod 14 is started to rise again, so that the fixed wheel 11 and the movable wheel 12 are close to each other. Since the fixed wheel 11 and the movable wheel 12 will not rotate, the detection wire 3 is squeezed and clamped by the two wheels, which can avoid the force acting directly on the plug-in position during the process of pulling the detection wire 3, which is beneficial to ensure the stability and service life of the plug-in position. Further, the box door on one side of the winding cavity 4 is opened, and the detection wire 3 is wound around the two guide wheels 5 and the tensioning wheel 6, so that during the pulling process, The detection line 3 can push the tensioning wheel 6 to move and compress the elastic telescopic rod 7 to provide space for making way, and the elastic telescopic rod 7 can compress the elastic component during the contraction process, and the pulling force is offset and dispersed by the elastic force of the elastic component, thereby reducing the force transmitted to the clamping position, thereby ensuring the stability and service life of the detection line 3 at the clamping position. Furthermore, during the line release process, when the operator pulls the detection line 3, the damping generated by the elastic deformation can allow the operator to feel a certain resistance feedback, so that the operator can clearly perceive the size of the operating force and the current stress state of the detection line 3, thereby performing more precise operations. It should be noted that, under normal conditions, in order to reduce the deformation of the detection line 3 during the clamping process, the clamping component provides a The holding force is small. If a small clamping force is still used during the pulling process, the clamping effect may be affected. Therefore, during the pulling process, when the elastic telescopic rod 7 contracts and makes way, the piston 10 pushes the gas in the fixed cylinder 8 to the guide tube 16, and discharges it to the airbag 15 through the guide tube 16, so that the airbag 15 is inflated and expands and squeezes the wire, increasing the clamping force on the detection line 3, thereby ensuring the stability of the detection line 3 when it is pulled. Secondly, when the pulling force is greater, the greater the contraction distance of the elastic telescopic rod 7, the greater the expansion degree of the airbag 15, so that the squeezing force of the airbag 15 on the detection line 3 can be automatically adjusted and adapted according to the size of the pulling force, so as to avoid the wire being continuously subjected to a large squeezing force, resulting in the deformation time of the detection line 3 being too long.A situation that affects the test results occurs.

[0031] As a further embodiment of the present invention, the elastic component includes a support frame 17 and a pressure sensor 18. The support frame 17 is fixed on the inner wall of the fixed cylinder 8. The pressure sensor 18 is fixed on the support frame 17. A first spring 19 is arranged between the pressure sensor 18 and the piston 10.

[0032] Specifically, since the end of the detection line 3 away from the resistance detection box 1 is a clamping claw contact, when the detection line 3 is tripped by a passerby, the clamping claw contact may loosen and affect the detection result. In order to enable the detection personnel to find the problem in time, this embodiment provides elastic resistance to the elastic telescopic rod 7 through the first spring 19. During the detection, the detection line 3 is in a straight state, so that the first spring 19 is in a deformed state and squeezes the pressure sensor 18. During the detection process, the looseness of the detection line 3 can be judged by the pressure detected by the pressure sensor 18.

[0033] As a further implementation scheme of the present invention, a regulating valve is inserted and fixed on the side wall of the fixed cylinder 8, and the regulating valve includes a valve cylinder 20 with openings at both ends, and a plurality of air-permeable grooves 21 are evenly opened in the middle of the valve cylinder 20, one end of the valve cylinder 20 is connected to the outside, and the other end of the valve cylinder 20 is connected to the guide pipe 16, and a first sealing plate 22 and a second sealing plate 23 are slidingly connected in the openings at both ends of the valve cylinder 20, respectively, a bracket 24 is fixed on the inner wall of the valve cylinder 20, and a sliding rod 25 is slidably inserted on the bracket 24, and both ends of the sliding rod 25 are respectively fixed on the surfaces of the first sealing plate 22 and the second sealing plate 23, and a second spring 26 is fixed between the bracket 24 and the first sealing plate 22.

[0034] Specifically, the surface material of some wires is relatively hard. When the airbag 15 is squeezed, the deformation of the wire is small, which makes it more difficult to expand the airbag 15, and then makes it difficult for the elastic telescopic rod 7 to continue to shrink and give way, affecting the normal use of the tensioning wheel 6. This embodiment can solve the above problems. The specific working method is as follows. In the initial state, under the elastic force of the second spring 26, the first sealing plate 22 is separated from one end of the valve cylinder 20, and the second sealing plate 23 seals the other end of the valve cylinder 20, so that the valve cylinder 20 is connected to the guide tube 16, and the fixed cylinder 8 is connected to the inside of the valve cylinder 20 through the air permeable groove 21, so that the fixed cylinder 8, the valve cylinder 20, the guide tube 16, and the airbag 15 are connected to each other. When the elastic telescopic rod 7 is contracted, the gas in the fixed cylinder 8 can enter the guide tube 16 to inflate the airbag 15. When the surface material of the wire is relatively hard, after the airbag 15 expands to a certain extent, it is difficult to continue to expand, and at this time the elastic telescopic rod 7 still needs to continue The second sealing plate 23 is continuously shortened. Under the action of air pressure, the second sealing plate 23 has a tendency to move toward the outside of the opening. When the air pressure increases to overcome the elastic force of the second spring 26, the second sealing plate 23 begins to move and moves out of the opening, so that the valve cylinder 20 is connected with the outside. During the movement of the second sealing plate 23, the sliding rod 25 can drive the first sealing plate 22 to move synchronously, and close the connecting position of the valve cylinder 20 and the guide tube 16 through the first sealing plate 22, so that the fixed cylinder 8 is only connected with the outside. In this way, when the airbag 15 does not continue to expand, the gas in the fixed cylinder 8 can be directly discharged to the outside, thereby ensuring the normal telescopic function of the elastic telescopic rod 7, and the connecting position of the guide tube 16 and the valve cylinder 20 is sealed synchronously through the first sealing plate 22, which is conducive to ensuring the normal extrusion state of the airbag 15 and avoiding the gas in the airbag 15 from flowing out from the valve cylinder 20 position, affecting the extrusion effect, causing the plug-in position to loosen, and affecting the detection result.

[0035] As a further implementation scheme of the present invention, the valve cylinder 20 includes a straight cylinder 27 and a conical cylinder 28. The straight cylinder 27 is arranged on a side close to the guide tube 16. The small end of the conical cylinder 28 is fixedly connected to the straight cylinder 27, and the large end of the conical cylinder 28 is connected to the outside. The air permeable groove 21 is opened on the outer wall of the conical cylinder 28.

[0036] Specifically, when the elastic telescopic rod 7 is contracted, if the air is exhausted through the regulating valve, the connecting position between the guide tube 16 and the valve cylinder 20 must be sealed first, and then the other end of the valve cylinder 20 must be opened to ensure that the gas inside the airbag 15 will not leak out, resulting in a decrease in the squeezing effect of the airbag 15. If a conventional straight valve cylinder 20 is used, after the first sealing plate 22 enters the interior of the valve cylinder 20, the space between the first sealing plate 22 and the second sealing plate 23 is fixed, so that when the air pressure inside the valve cylinder 20 increases, a jamming phenomenon may occur. In order to solve the above problem, this embodiment designs the shape of the valve cylinder 20, and the conical cylinder 28 has a large end and a small end. The opening size of the large end is larger, and the opening size of the small end is smaller. When the elastic telescopic rod 7 is contracted, the gas pushes the second sealing plate 23 to move toward the outside of the conical cylinder 28. The second sealing plate 23 drives the first sealing plate 22 to move through the sliding rod 25, so that the first sealing plate 22 enters the straight cylinder 27, and seals the connection position between the guide tube 16 and the valve cylinder 20 in advance, so as to prevent the gas in the airbag 15 from overflowing from the connection position between the guide tube 16 and the valve cylinder 20 when exhausting, resulting in a reduced extrusion effect. After the first sealing plate 22 enters the straight cylinder 27, under the action of air pressure, the second sealing plate 23 will be pushed to continue to move toward the large end of the cone cylinder 28, so that the space between the first sealing plate 22 and the second sealing plate 23 is enlarged, providing space for the gas to make way. When the second sealing plate 23 moves out of the cone cylinder 28, the space between the first sealing plate 22 and the second sealing plate 23 is connected to the outside, so that the gas in the elastic telescopic rod 7 can be directly discharged to the outside through the valve cylinder 20, thereby ensuring the normal tensioning function of the tensioning wheel 6.

[0037] As a further embodiment of the present invention, a plurality of exhaust grooves 29 are provided on the side wall of the cone 28 , filter cotton 30 is filled and fixed in the exhaust grooves 29 , and a limiting block 31 is fixed on the inner wall of the cone 28 .

[0038] Specifically, by setting the exhaust groove 29, after the second sealing plate 23 moves to the position of the exhaust groove 29, the gas in the valve cylinder 20 can be discharged from the exhaust groove 29 to complete the pressure relief. When the air pressure inside the valve cylinder 20 is relatively high, the movement of the second sealing plate 23 can be limited by the limit block 31, so that the gas can only be discharged from the exhaust groove 29. Since the size of the exhaust groove 29 is relatively small, the gas in the valve cylinder 20 can be discharged slowly, avoiding the elastic telescopic rod 7 from shrinking quickly and causing a large pulling force, which leads to the loosening of the clamping position of the detection line 3. In addition, the filter cotton 30 can also filter the gas during the subsequent air intake process to reduce the entry of dust and impurities.

[0039] As a further embodiment of the present invention, a through hole 32 is formed on the outer wall of the second sealing plate 23 close to the inside of the valve cylinder 20 . The through hole 32 is connected to the outside, and an elastic membrane 33 is fixed on the inner wall of the through hole 32 .

[0040] Specifically, part of the detection line 3 is relatively thin. During the detection process, slight shaking may occur due to wind blowing or other circumstances, causing the elastic telescopic rod 7 to contract and extend in a small range with a high frequency, thereby causing the airbag 15 to be repeatedly inflated and deflated, and the clamping part of the detection line 3 continues to be squeezed back and forth. The reciprocating deformation of the detection line 3 may have an adverse effect on the detection result. In order to reduce this adverse effect, this embodiment provides an elastic membrane 33. The material of the elastic membrane 33 is easier to deform than the airbag 15. Therefore, when the elastic telescopic rod 7 contracts, the elastic membrane 33 can deform first and sink outward, thereby increasing the internal space of the valve cylinder 20 and providing space for the gas to make way, thereby avoiding the situation where the airbag 15 repeatedly expands and contracts to squeeze the detection line 3, which is beneficial to ensuring the accuracy of the detection result.

[0041] As a further embodiment of the present invention, a blocking plate 34 is fixed to one side of the second sealing plate 23 , a sealing bag 35 is fixed to the outer annular surface of the second sealing plate 23 , and the sealing bag 35 is connected to the inside of the through hole 32 through a pipe 36 .

[0042] Specifically, since the size of the cone 28 is gradually increased during the movement of the second sealing plate 23, the sealing bag 35 on the outer ring surface of the second sealing plate 23 needs to be continuously increased during the movement. If an ordinary sealing strip is used, the sealing effect is poor and gas leakage may occur. If the first sealing plate 22 has not entered the straight tube 27 when the gas leaks, the gas inside the airbag 15 will be reduced, affecting the extrusion performance of the airbag 15. This embodiment of the present invention can solve the above problem. The specific working method is as follows: by sealing one side of the through hole 32, when the elastic telescopic rod 7 is contracted, the gas first squeezes the elastic membrane 33, so that the elastic membrane 33 is recessed into the through hole 32, and the gas inside the through hole 32 is squeezed into the pipe 36. The gas is then transported into the sealing bag 35 through the pipe 36, so that the sealing bag 35 expands and fits tightly against the inner wall of the cone cylinder 28. As the second sealing plate 23 moves, the gap between the second sealing plate 23 and the inner wall of the cone cylinder 28 increases, so that the sealing bag 35 has space to continue to expand. Under the action of air pressure, the elastic membrane 33 can further deform, and the gas remaining in the through hole 32 is promptly transported into the sealing bag 35, so that the inside of the sealing bag 35 can continue to be inflated during the movement, so that the sealing bag 35 can always fit tightly against the inner wall of the cone cylinder 28, thereby ensuring the sealing performance of the second sealing plate 23 during the movement, and then ensuring that the first sealing plate 22 can seal the straight cylinder 27 first, and the cone cylinder 28 is connected to the outside, to avoid gas leakage inside the airbag 15.

[0043] As a further embodiment of the present invention, a sealing ring 37 is fixedly mounted on the outer wall of the first sealing plate 22 , and the sealing ring 37 has a first port 38 and a second port 39 . The inner diameter of the second port 39 is larger than the inner diameter of the first port 38 , and the second port 39 is arranged on a side close to the second spring 26 .

[0044] Specifically, when the first sealing plate 22 moves in the straight tube 27, the second port 39 of the sealing ring 37 contacts the inner wall of the straight tube 27. Since the second port 39 of the sealing ring 37 is relatively large, a radial force component is generated during the movement due to its tapered structure, so that the sealing ring 37 can fit more closely on the sealing surface, and as the pressure increases, this fit becomes tighter, thereby achieving a good self-tightening sealing effect. When the elastic telescopic rod 7 is extended to inhale, negative pressure is generated inside the valve cylinder 20. Since there is a gap between the second port 39 and the outer annular surface of the first sealing plate 22, negative pressure is generated in the negative Under the action of pressure, the second port 39 tends to approach the outer ring surface of the first sealing plate 22, and part of the position on the sealing ring 37 will be separated from the inner wall of the straight tube 27, causing the sealing ring 37 to lose its sealing effect, so that the gas in the guide tube 16 can enter the valve cylinder 20 to complete the exhaust of the airbag 15, avoiding the difficulty in exhausting the internal gas of the airbag 15 and the continuous squeezing of the detection line 3. Furthermore, the gas at the position of the second sealing plate 23 enters from the exhaust groove 29. Since the exhaust groove 29 is small in size, it can also extend the extension time of the elastic telescopic rod 7, providing the airbag 15 with sufficient exhaust time.

[0045] As a further embodiment of the present invention, the surface of the resistance detection box 1 is rotatably connected to multiple groups of guide pillars 40, each group of guide pillars 40 has two guide pillars, and the two guide pillars 40 are symmetrically arranged on both sides of the clamping position.

[0046] Specifically, since there are multiple detection lines 3 and the plug-in positions are relatively concentrated, when fixing the wires, the wires need to be dispersed and moved to various clamping positions. By setting the guide column 40, the wires can be limited and guided to avoid the wires being skewed during clamping, which affects the clamping effect.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A construction engineering electrical grounding resistance detection device, comprising a resistance detection box (1), wherein a plurality of connection terminals (2) are arranged inside the resistance detection box (1), and detection wires (3) are plugged into the connection terminals (2), characterized in that: The resistance detection box (1) has a winding chamber (4) inside, two guide wheels (5) are rotatably connected to the side wall of the winding chamber (4), a tensioning wheel (6) is arranged between the two guide wheels (5), an elastic telescopic rod (7) is fixed between the mounting seat of the tensioning wheel (6) and the inner wall of the winding chamber (4), the elastic telescopic rod (7) comprises a fixed cylinder (8) and a movable rod (9), the fixed cylinder (8) is fixed to the side wall of the winding chamber (4), the movable rod (9) is fixed to the mounting seat of the tensioning wheel (6), the movable rod (9) is inserted into the fixed cylinder (8), a piston (10) is fixed to the end of the movable rod (9), and an elastic component is arranged inside the fixed cylinder (8); A clamping assembly is provided on one side of the wiring terminal (2), the clamping assembly comprising a fixed wheel (11) and a movable wheel (12), a fixed rod (13) is fixed between the fixed wheel (11) and the resistance detection box (1), an electric push rod (14) is fixed between the movable wheel (12) and the resistance detection box (1), an air bag (15) is sleeved on the fixed wheel (11), a flow guide tube (16) is fixedly connected to the side wall of the fixed cylinder (8), and the flow guide tube (16) is connected to the inside of the air bag (15).

2. A construction engineering electrical grounding resistance detection device according to claim 1, characterized in that: The elastic component comprises a support frame (17) and a pressure sensor (18); the support frame (17) is fixed on the inner wall of the fixed cylinder (8); the pressure sensor (18) is fixed on the support frame (17); and a first spring (19) is provided between the pressure sensor (18) and the piston (10).

3. A construction engineering electrical grounding resistance detection device according to claim 1, characterized in that: A regulating valve is inserted and fixed on the side wall of the fixed cylinder (8), and the regulating valve comprises a valve cylinder (20) with openings at both ends, a plurality of air-permeable grooves (21) are evenly arranged in the middle of the valve cylinder (20), one end of the valve cylinder (20) is connected to the outside, and the other end of the valve cylinder (20) is connected to the guide pipe (16), a first sealing plate (22) and a second sealing plate (23) are slidably connected in the openings at both ends of the valve cylinder (20), a bracket (24) is fixed on the inner wall of the valve cylinder (20), a sliding rod (25) is slidably inserted on the bracket (24), and the two ends of the sliding rod (25) are respectively fixed on the surface of the first sealing plate (22) and the second sealing plate (23), and a second spring (26) is fixed between the bracket (24) and the first sealing plate (22).

4. A construction engineering electrical grounding resistance detection device according to claim 3, characterized in that: The valve cylinder (20) comprises a straight cylinder (27) and a conical cylinder (28); the straight cylinder (27) is arranged on a side close to the flow guide tube (16); the small end of the conical cylinder (28) is fixedly connected to the straight cylinder (27); the large end of the conical cylinder (28) is connected to the outside; and the air permeable groove (21) is provided on the outer wall of the conical cylinder (28).

5. A construction engineering electrical grounding resistance detection device according to claim 4, characterized in that: A plurality of exhaust grooves (29) are provided on the side wall of the cone cylinder (28), filter cotton (30) is filled and fixed in the exhaust grooves (29), and a limiting block (31) is fixed on the inner wall of the cone cylinder (28).

6. A construction engineering electrical grounding resistance detection device according to claim 4, characterized in that: A through hole (32) is provided on the outer wall of one side of the second sealing plate (23) close to the inside of the valve cylinder (20); the through hole (32) is connected to the outside, and an elastic membrane (33) is fixed on the inner wall of the through hole (32).

7. A construction engineering electrical grounding resistance detection device according to claim 6, characterized in that: A blocking plate (34) is fixed to one side of the second sealing plate (23), a sealing bag (35) is fixed to the outer annular surface of the second sealing plate (23), and the sealing bag (35) is connected to the interior of the through hole (32) through a pipe (36).

8. The construction engineering electrical grounding resistance detection device according to claim 4, characterized in that: A sealing ring (37) is sleeved and fixed on the outer wall of the first sealing plate (22), the sealing ring (37) having a first port (38) and a second port (39), the inner diameter of the second port (39) being larger than the inner diameter of the first port (38), and the second port (39) being arranged on a side close to the second spring (26).

9. The construction engineering electrical grounding resistance detection device according to claim 1, characterized in that: The surface of the resistance detection box (1) is rotatably connected to a plurality of groups of guide pillars (40), each group of the guide pillars (40) having two guide pillars, and the two guide pillars (40) are symmetrically arranged on both sides of the clamping position.

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