Height-adjustable instrument for overhead contact system of railway

Abstract

The utility model relates to a kind of screw rod type railway overhead line structure height adjustable instrument, including the drive mechanism outside shell, laser range finder and first drag hook subassembly, the adjusting box subassembly of the screw rod and rotating component being equipped in shell, the both ends of the screw rod are worn out to the shell outside, one end is equipped with second drag hook subassembly, the direction of the laser range finder is parallel with the length direction of the screw rod, the rotating component includes threaded sleeve, rotating bevel gear and rotating bearing, the drive mechanism includes drive bevel gear, drive shaft and drive handle, the distance between first drag hook subassembly and second drag hook subassembly is rotated by drive mechanism drive rotating mechanism adjustment.The utility model structure is portable and convenient to carry, and simple to operate, the height of railway overhead line is accurately measured by laser range finder, and railway overhead line height is quickly and high-precision adjusted accordingly;By mechanical thread screw rod connection, it is not easy to damage with greater strength and rigidity.

Description

Technical Field

[0001] This utility model belongs to the technical field of railway catenary height adjustment equipment, and in particular relates to a screw-type railway catenary structure height adjustable instrument. Background Technology

[0002] In railway electrification systems, the overhead contact line, as the power source for electric locomotives, is of paramount importance. A suitable and stable overhead contact line height is crucial for ensuring good pantograph-catenary contact and achieving efficient and stable current collection. With the continuous increase in railway operating speeds and train density, more stringent requirements are placed on the accuracy and stability of the overhead contact line height. For example, in high-altitude and cold regions, large temperature differences and frequent rain and snow cause soil loosening, making the overhead contact line supports prone to tilting, which in turn leads to changes in the height of the overhead contact line conductors, affecting the power supply to electric locomotives.

[0003] Currently, there are several main methods for adjusting the height of the overhead contact line: One method involves adjusting the contact wire droppers. This method requires the use of a ladder or rail-mounted work vehicle, with a 6C vehicle-mounted or hand-operated laser measuring instrument to determine sections with a height difference > 10mm. Within the designated maintenance window, a static laser measuring instrument is used to verify the precise guide height of each dropper / positioning point. The required millimeters to raise / lower the droppers are calculated based on the design slope (e.g., ≤ 3‰ for 120km / h sections). The dropper clamps or positioners are loosened, and a hydraulic tensioner or electric chain hoist is used to raise / lower the line to the target height in one go. After verification, the clamps are locked to complete the height adjustment. This method requires at least 9 people per work group, including operators and support staff. Based on 100 minutes of effective working time, only 150 meters of contact wire height adjustment can be completed. This not only results in high costs associated with deploying large machinery but also extremely low labor efficiency. Other tools include chain hoists or wire rope tensioners. However, these tools have a wide range of adjustment levels, making them inaccurate to the millimeter, and they can only tighten and raise the rope, not release and lower it, making them extremely inconvenient to use.

[0004] In the prior art, the patent "Contact Network Structure Height Fine Adjuster" with publication number CN218463507U uses a hexagonal crank handle inserted into a dial to rotate, thereby tightening or releasing the wire rope to adjust the distance. This allows for millimeter-level adjustments and integrates the wire release and reeling processes, making it compact and portable. To address the aforementioned issues, the applicant's previous patent application, number 2025110764490, provides a servo-type intelligent portable height adjuster for railway contact networks. Suspended between the contact network and the catenary cable, it automatically adjusts the height with a single measurement, significantly reducing the number of maintenance personnel and saving time spent replacing or adjusting droppers.

[0005] However, the existing technology still has the following technical problems: the extension distance of the extension rod is controlled by a motor without a locking structure. Long-term stress during use may damage the motor and reduce its service life. In order to ensure portability, a large-volume motor cannot be installed in the recovery rod. The motor power is small, which results in a slow extension and retraction speed of the extension rod, affecting work efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a screw-type adjustable height device for railway contact network structures to solve the technical problems mentioned in the background art.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A screw-type adjustable height instrument for railway contact wire structures is provided, including an adjustment box assembly. The outer shell of the adjustment box assembly is provided with a drive mechanism, a laser rangefinder, and a first hook assembly. Inside the shell of the adjustment box assembly is a screw and a rotating assembly. Both ends of the screw extend outwards from the shell, with a second hook assembly at one end. The first and second hook assemblies are arranged facing opposite directions. The laser rangefinder is parallel to the length direction of the screw. A limit groove is formed along the length direction of the screw. The limiting groove mates with a limiting block located within the housing to prevent the screw from rotating around its axis. The rotating assembly includes a threaded sleeve, a rotating helical gear, and a rotating bearing. The internal thread of the threaded sleeve engages with the external thread of the screw. The threaded sleeve and the rotating helical gear are coaxially and fixedly connected. The threaded sleeve is rotatably mounted within the housing via the rotating bearing. The driving mechanism includes a driving helical gear, a driving shaft, and a driving handle. The driving helical gear meshes with the rotating helical gear. The driving helical gear is connected to the driving handle via the driving shaft.

[0008] Preferably, the housing side of the adjustment box assembly is provided with a clamping frame for holding the laser rangefinder.

[0009] Preferably, the housing is composed of a left adjustment box and a right adjustment box, and the inner cavity formed between the left adjustment box and the right adjustment box is an adjustment chamber. The screw and the rotating assembly are disposed in the adjustment chamber, and the upper and lower ends of the left adjustment box and the right adjustment box are provided with through holes for the screw to pass through.

[0010] Preferably, both the upper and lower ends of the left and right adjustment boxes are provided with fixing plate grooves for installing fixing plates. The fixing plate is composed of a left fixing plate and a right fixing plate. The through hole is provided between the left fixing plate and the right fixing plate. The left fixing plate and the right fixing plate are provided with two limiting blocks arranged opposite to each other.

[0011] Preferably, a drive retainer is provided on one side of the left or right adjustment box. The drive shaft is rotatably mounted in the drive retainer via a drive bearing. The drive retainer includes a cylindrical body as an outer shell, and a cylindrical cavity inside the cylindrical body. A limit plate groove is opened at the outer end of the cylindrical cavity. A drive limit plate as an end cap is fixed in the limit plate groove. A rotating shaft hole for the drive shaft to pass through is opened at the center of the drive limit plate.

[0012] Preferably, the end face of the drive shaft connected to the drive handle has a drill connection hole.

[0013] Preferably, the first hook assembly and the second hook assembly are respectively an anti-detachment hook assembly and an anti-slip hook assembly. The anti-detachment hook assembly is connected to the housing via a connecting assembly, and the anti-slip hook assembly is connected to the screw via a connecting assembly. The connecting assembly includes a connecting plate, one end of which has a plurality of fixing bolt holes. The first hook assembly and the second hook assembly select one or more of the fixing bolt holes according to the hook position and are connected to the connecting plate via fixing bolts. When the connecting plate is connected to the screw, one end of the connecting plate is provided with a threaded connector, and the threaded connector is connected to the threaded end of the screw via a lock nut. When the connecting plate is connected to the housing, one end of the connecting plate is directly fixed to the surface of the housing.

[0014] Preferably, the anti-detachment hook assembly includes a hook, and the hook is provided with an anti-detachment device. The anti-detachment device includes a clamp, a spring, and a pin. The pin is rotatably installed in the pin hole of the hook. The clamp is connected to the inner wall of the hook of the hook through the spring. The pin is connected to the clamp. When the spring is in the initial pressure position, the clamp closes the opening of the hook.

[0015] Preferably, the anti-slip hook assembly includes a hook, and a wear-resistant and anti-slip rubber sleeve is fitted onto the hook bend.

[0016] The advantages are as follows: This utility model has a lightweight and portable structure, is easy to use and operate, accurately measures the height of the railway contact network using a laser rangefinder, and adjusts the height of the railway contact network quickly and with high precision accordingly; it is connected by a mechanical threaded screw, which has great strength and rigidity and is not easily damaged; the screw can be driven with a small amount of force at the operating end, and the screw position adjustment can be accelerated simply by inserting a hand drill into the drill connection hole. Attached Figure Description

[0017] Figure 1 This is a front elevation diagram of a screw-type adjustable height railway contact network structure. Figure 2 This is a schematic diagram of the rear elevation of a screw-type railway contact network structure height adjustable instrument; Figure 3 This is a side elevation diagram of a screw-type railway catenary structure height adjustable instrument; Figure 4 This is a schematic diagram of the vertical cross-section of a screw-type railway contact network structure height adjustable instrument; Figure 5 yes Figure 4 Schematic diagram of the AA section; Figure 6 yes Figure 4 Schematic diagram of the BB cross section; Figure 7 yes Figure 4 Schematic diagram of the CC section; Figure 8 yes Figure 4 Schematic diagram of the DD section; Figure 9 yes Figure 4 Schematic diagram of the EE cross section; Figure 10 Figure 4 Schematic diagram of the FF section; Figure 11 Figure 4 Schematic diagram of the cross-section of GG in China; Figure 12 Figure 1 Schematic diagram of the anti-detachment hook assembly; Figure 13 Figure 1 Schematic diagram of the anti-slip hook assembly; Figure 14 yes Figure 1 Schematic diagram of the middle screw; Figure 15 This is a schematic diagram of Embodiment 2 of a screw-type adjustable height railway contact network structure. Figure 16 This is a schematic diagram illustrating the usage of a screw-type adjustable height meter for railway contact wire structures. Figure 1 ; Figure 17 This is a schematic diagram illustrating the usage of a screw-type adjustable height meter for railway contact wire structures. Figure 2 .

[0018] Among them, a. Screw-type adjustable height instrument for railway contact network structure, b. Catenary wire, c. Contact network, d. Dropper, e. Track work vehicle, f. Track plane, g. Lifting platform, L. Distance from laser rangefinder to hook, H. Standard height of contact network, h1. Distance from lifting platform to guide rail, h2. Distance from laser rangefinder to lifting platform; 1. Screw, 2. Hook assembly, 3. Connecting assembly, 4. Adjusting box assembly, 5. Drive mechanism, 6. Rotating assembly, 7. Clamping frame, 8. Laser rangefinder; 11. Rod body; 12. Limiting groove; 13. Connecting thread; 14. Thread; 21. Anti-detachment hook assembly; 22. Anti-slip hook assembly; 211. Hook; 212. Anti-detachment device; 213. Wear-resistant and anti-slip rubber sleeve; 214. Through hole; 215. Pin hole; 2121. Clip; 2122. Spring; 2123. Pin; 31. Connecting plate; 32. Threaded connector; 33. Locking nut; 34. Threaded hole; 35. Fixing bolt hole; 36. Fixing bolt; 37. Hole; 41. Housing; 42. Fixing plate; 43. Drive retainer; 44. Fastening bolt hole; 45. Fastening bolt; 411. Right adjusting box; 412. Left adjusting box; 413. Adjusting chamber; 414. Fixing plate groove; 415. Through hole; 416. Screw hole; 417. Screw; 418. Rotating chamber; 421. Upper fixing plate; 422. Lower fixing plate; 423. Limiting block; 424. Limiting hole; 431. Cylinder body; 432. Cylinder cavity; 433. Drive limiting plate; 434. Limiting plate groove; 435. Rotary shaft hole; 51. Drive helical gear; 52. Drive shaft; 53. Drive bearing; 54. Drive handle; 55. Electric drill connection hole; 61. Rotating helical gear; 62. Threaded sleeve; 63. Rotating bearing; 64. Reinforcing ring; 631. Outer ring, 632. Inner ring, 633. Roller, 644. Cage, 655. Mounting hole.

[0019] The same markings in each diagram represent the same component. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0021] like Figure 1 As shown, this utility model provides a screw-type adjustable height instrument for railway contact network structure, including an adjustment box assembly 4. The housing 41 of the adjustment box assembly 4 is provided with a drive mechanism 5, a laser rangefinder 8 and a first hook assembly. The housing 41 of the adjustment box assembly 4 is provided with a screw 1 and a rotating assembly 6.

[0022] The housing 41 is generally square. Both ends of the screw 1 extend outwards from the top and bottom of the housing 41. One end of the screw 1 is provided with a second hook assembly. The first hook assembly and the second hook assembly are arranged facing opposite directions. The laser rangefinder 8 is oriented parallel to the length direction of the screw 1. A limiting groove 12 is formed along the length direction of the screw 1's shaft 11. The limiting groove 12 mates with a limiting block 423 located within the housing 41 to prevent the screw 1 from rotating around its axis. Figure 1-4 In the specific embodiment shown, the upper end of the screw 1 is provided with the second hook assembly, the lower end of the housing 41 is provided with the first hook assembly, and the laser rangefinder 8 is provided on the side of the housing 41, parallel to the length direction of the screw 1 and arranged towards the first hook assembly.

[0023] like Figure 4 , 7 As shown in Figure 8, the inner cavity of the housing 41 for mounting the rotating assembly 6 is called the rotating chamber 418. The rotating assembly 6 includes a threaded sleeve 62, a rotating helical gear 61, and a rotating bearing 63. The internal thread of the threaded sleeve 62 mates with the external thread of the screw 1. The threaded sleeve 62 and the rotating helical gear 61 are coaxially and fixedly connected. The threaded sleeve 62 is rotatably mounted in the housing 41 through the rotating bearing 63. A reinforcing ring 64 with a triangular cross-section is provided at the connection between the threaded sleeve 62 and the rotating helical gear 61, which ensures connection strength while narrowing the outer diameter of the threaded sleeve 62 and reducing the overall size.

[0024] The drive mechanism 5 includes a drive helical gear 51, a drive shaft 52, and a drive handle 54. The drive helical gear 51 meshes with the rotating helical gear 61, and the drive helical gear 51 is connected to the drive handle 54 through the drive shaft 52.

[0025] The housing 41 of the adjustment box assembly 4 is provided with a clamping frame 7 for holding the laser rangefinder 8. The surface of the clamping frame 7 has screw holes 416, and the laser rangefinder 8 is fixed on the clamping frame 7 by screws 417 screwed into the screw holes 416.

[0026] The housing 41 is composed of a left adjustment box 412 and a right adjustment box 411. The inner cavity formed between the left adjustment box 412 and the right adjustment box 411 is an adjustment chamber 413. The screw 1 and the rotating assembly 6 are disposed in the adjustment chamber 413. Both the upper and lower ends of the left adjustment box 412 and the right adjustment box 411 are provided with through holes 415 for the screw 1 to pass through.

[0027] like Figure 4In the specific embodiment shown, both the upper and lower ends of the left adjustment box 412 and the right adjustment box 411 are provided with fixing plate grooves 414 for mounting the fixing plate 42. Figure 6 The image shown is a top view of the upper fixing plate 421 located at the top. Figure 10 The image shown is a top view of the lower fixing plate 422 located at the lower end, as shown below. Figure 11 The image shows a bottom view of the lower fixing plate 422 located at the lower end. Specifically, the fixing plate 42 is composed of a left fixing plate and a right fixing plate. The through hole 415 is located between the left and right fixing plates. The left and right fixing plates are provided with two opposing limiting blocks 423. The fixing plate 42 is fixed to the housing 41 and the fixing bolt holes 44 of the fixing plate 42 by fastening bolts 45. The screw 1 passes through the through hole 415 on both fixing plates 42, and its length-direction limiting groove 12 is restricted by the limiting blocks 423 and cannot rotate.

[0028] A drive retainer 43 is provided on one side of the left adjustment box 412 or the right adjustment box 411. The drive shaft 52 is rotatably mounted in the drive retainer 43 via a drive bearing 53. The drive retainer 43 includes a cylindrical body 431 as a shell. The cylindrical body 431 has a cylindrical cavity 432 inside. A limit plate groove 434 is opened at the outer end of the cylindrical cavity 432. A drive limit plate 433 as an end cover is fixed in the limit plate groove 434. A rotating shaft hole 435 for the drive shaft 52 to pass through is opened at the center of the drive limit plate 433.

[0029] like Figure 9 In the specific embodiment shown, both the rotary bearing 63 and the drive bearing 53 are commonly used roller bearings, including an outer ring 631 and an inner ring 632. A cage 644 is provided between the inner ring 632 and the outer ring 631. The cage 644 has mounting holes 655 for mounting the roller 633, allowing the inner ring 632 and the outer ring 631 to rotate relative to each other via the roller 633. The outer circumference of the outer ring 631 of the rotary bearing 63 is fixed inside the housing 41, and the inner circumference of the inner ring 632 is fixed outside the threaded sleeve 62, allowing the threaded sleeve 62 to rotate relative to the housing 41. The outer circumference of the outer ring 631 of the drive bearing 53 is fixed inside the cylindrical body 431, and the inner circumference of the inner ring 632 is fixed outside the drive shaft 52, allowing the drive shaft 52 to rotate relative to the cylindrical body 431.

[0030] A drill connection hole 55 is provided on the end face of the drive shaft 52 that is connected to the drive handle 54. For example... Figure 8 , 15In the specific embodiment shown, the drill connection hole 55 is a square hole. A matching square connecting block can be added to the end of the pistol drill. The position adjustment of the screw 1 can be accelerated simply by inserting the electric drill into the drill connection hole 55, allowing the operating end to quickly drive the screw 1 to move with less force, thereby changing the distance between the first hook assembly and the second hook assembly.

[0031] like Figure 2 , 3 In the specific embodiments shown in 4 and 5, the first hook assembly and the second hook assembly are respectively an anti-detachment hook assembly 21 and an anti-slip hook assembly 22. The anti-detachment hook assembly 21 is connected to the housing 41 through a connecting assembly, and the anti-slip hook assembly 22 is connected to the screw 1 through a connecting assembly. Both are connected to the housing 41 and the screw 1 through a connecting assembly 3. The connecting assembly 3 includes a connecting plate 31, one end of which has several fixing bolt holes 35. The first hook assembly and the second hook assembly select one or more of the fixing bolt holes 35 according to the hook position and connect to the connecting plate 31 through fixing bolts 36 (e.g., ...). Figure 15 (Double-hook type) When the connecting plate 31 is connected to the screw 1, one end of the connecting plate 31 is provided with a threaded connector 32, and the threaded connector 32 has a threaded hole 34, which is connected to the threaded end of the screw 1, and is further locked by a locking nut 33; when the connecting plate 31 is connected to the housing 41, one end of the connecting plate 31 is directly fixed to the surface of the housing 41. To reduce weight, the connecting plate 31 is also provided with several perforated holes 37.

[0032] like Figure 12 In the specific embodiment shown, the anti-detachment hook assembly 21 includes a hook 211, and an anti-detachment device 212 is provided on the hook 211. The anti-detachment device 212 includes a clip 2121, a spring 2122, and a pin 2123. The pin 2123 is rotatably installed in the pin hole 215 of the hook. The clip 2121 is connected to the inner wall of the hook 211 through the spring 2122. The pin 2123 is connected to the clip 2121. When the spring 2122 is in the initial pressure position, the clip 2121 closes the opening of the hook 211.

[0033] like Figure 13 In the specific embodiment shown, the anti-slip hook assembly 22 includes a hook 211, and a wear-resistant and anti-slip rubber sleeve 213 is fitted onto the hook of the hook 211.

[0034] The distance from the laser rangefinder 8 on the adjustable height instrument a of the screw-type railway contact network structure to the hook 211 of the first hook assembly is L, and the height between the lifting platform g and the track plane f is h1. In order for the contact network c to meet the standard height H between the contact network c and the track plane f, the height from the laser rangefinder 8 to the lifting platform g needs to be h2 = H-h1+L. It can be determined whether the standard height H between the contact network c and the track plane f has been reached based on the distance measured in real time by the laser rangefinder 8.

[0035] like Figure 16 As shown, when the height of the catenary cable b is relatively low and it is possible to contact the catenary cable without adjusting the height of the lifting platform g, the method of using this utility model is as follows: The operator stands on the lifting platform g at its lowest position and holds this utility model to attach the first hook assembly to the contact wire c and the second hook assembly to the catenary cable b; the operator cranks the drive handle 54 to retract the screw 1, and determines whether the distance from the contact wire c to the track plane f meets the design requirements based on the reading of the laser rangefinder 85; after confirming that the design requirements are met, the cable is re-locked or the suspension cable d is replaced.

[0036] like Figure 16 As shown, another method of using this utility model when the height of the catenary cable b is high and the height of the lifting platform g needs to be adjusted is as follows: The operator stands on the raised lifting platform g and first uses the laser rangefinder 8 of this invention to measure the height h1 between the lifting platform g and the track plane f; then, the operator holds this utility model and hangs the first hook assembly on the contact wire c and the second hook assembly on the catenary cable b; the operator cranks the drive handle 54 to release or retract the screw 1, and determines whether the distance from the contact wire c to the track plane f meets the design requirements based on the reading of the laser rangefinder 85; after confirming that the design requirements are met, the suspension cable d is re-locked.

[0037] Compared with the prior art, the advantages are as follows: (1) The screw-type adjustable height instrument for railway contact network structure provided by this utility model is lightweight, easy to carry, and simple to use; (2) Railway contact network maintenance requires a lot of manual pulling and measurement work. By suspending the screw-type portable adjustable instrument between the contact network and the catenary cable to adjust the height of the contact network, the number of maintenance personnel can be greatly reduced, and the time for replacing or adjusting the suspension wire can be saved; (3) The laser rangefinder can accurately measure the height of the railway contact network. By using the screw-type adjustable height instrument for railway contact network structure, the height of the railway contact network can be controlled with millimeter accuracy, ensuring good contact between the contact network and the pantograph, and ensuring the safety and stability of the running train; (4) The screw-type adjustable height instrument for railway contact network structure has greater strength and rigidity and can adapt to complex working conditions; (5) By inserting a hand drill into the drill connection hole, the extension and retraction of the screw can be accelerated, and the efficiency of the contact network height adjustment can be improved.

Claims

1. A screw-type adjustable height instrument for railway contact wire structure, characterized in that, The system includes an adjustment box assembly. The outer casing of the adjustment box assembly houses a drive mechanism, a laser rangefinder, and a first hook assembly. The inner casing of the adjustment box assembly houses a screw and a rotating assembly. Both ends of the screw extend outward from the housing, with a second hook assembly at one end. The first and second hook assemblies are arranged facing opposite directions. The laser rangefinder is oriented parallel to the length direction of the screw. A limiting groove is formed along the length direction of the screw, and the limiting groove mates with a limiting block located within the housing to prevent the screw from rotating around its axis. The rotating assembly includes a threaded sleeve, a rotating helical gear, and a rotating bearing. The internal thread of the threaded sleeve mates with the external thread of the screw. The threaded sleeve is coaxially and fixedly connected to the rotating helical gear. The threaded sleeve is rotatably mounted within the housing via the rotating bearing. The driving mechanism includes a driving helical gear, a driving shaft, and a driving handle. The driving helical gear meshes with the rotating helical gear, and the driving helical gear is connected to the driving handle via the driving shaft.

2. The screw-type adjustable height instrument for railway contact network structure according to claim 1, characterized in that, The side of the housing of the adjustment box assembly is provided with a clamping frame for holding the laser rangefinder.

3. The screw-type adjustable height instrument for railway contact network structure according to claim 1, characterized in that, The housing is composed of a left adjustment box and a right adjustment box. The inner cavity formed between the left and right adjustment boxes is an adjustment chamber. The screw and the rotating assembly are located in the adjustment chamber. Both the upper and lower ends of the left and right adjustment boxes have through holes for the screw to pass through.

4. The screw-type adjustable height instrument for railway contact network structure according to claim 3, characterized in that, Both the upper and lower ends of the left and right adjustment boxes are provided with fixing plate grooves for installing fixing plates. The fixing plate is composed of a left fixing plate and a right fixing plate. The through hole is provided between the left fixing plate and the right fixing plate. The left fixing plate and the right fixing plate are provided with two limiting blocks arranged opposite to each other.

5. The screw-type adjustable height instrument for railway contact network structure according to claim 3, characterized in that, A drive retainer is provided on one side of the left or right adjustment box. The drive shaft is rotatably mounted in the drive retainer via a drive bearing. The drive retainer includes a cylindrical body as an outer shell, and a cylindrical cavity inside the cylindrical body. A limit plate groove is opened at the outer end of the cylindrical cavity. A drive limit plate as an end cover is fixed in the limit plate groove. A rotating shaft hole for the drive shaft to pass through is opened at the center of the drive limit plate.

6. The screw-type adjustable height instrument for railway contact network structure according to claim 1, characterized in that, A drill connection hole is provided on the end face of the drive shaft that is connected to the drive handle.

7. The screw-type adjustable height instrument for railway contact network structure according to claim 1, characterized in that, The first hook assembly and the second hook assembly are respectively an anti-detachment hook assembly and an anti-slip hook assembly. The anti-detachment hook assembly is connected to the housing via a connecting assembly, and the anti-slip hook assembly is connected to the screw via the connecting assembly. The connecting assembly includes a connecting plate, one end of which has a plurality of fixing bolt holes. The first hook assembly and the second hook assembly select one or more of the fixing bolt holes according to the hook position and are connected to the connecting plate via fixing bolts. When the connecting plate is connected to the screw, one end of the connecting plate is provided with a threaded connector, and the threaded connector is connected to the threaded end of the screw through a lock nut; When the connecting plate is connected to the housing, one end of the connecting plate is directly fixed to the surface of the housing.

8. The screw-type adjustable height instrument for railway contact network structure according to claim 7, characterized in that, The anti-detachment hook assembly includes a hook, and the hook is provided with an anti-detachment device. The anti-detachment device includes a clamp, a spring, and a pin. The pin is rotatably installed in the pin hole of the hook. The clamp is connected to the inner wall of the hook of the hook through the spring. The pin is connected to the clamp. When the spring is in the initial pressure position, the clamp closes the opening of the hook.

9. A screw-type adjustable height instrument for railway contact network structure according to claim 7, characterized in that, The anti-slip hook assembly includes a hook, and a wear-resistant and anti-slip rubber sleeve is fitted onto the hook bend.

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