Ground line retractor

Abstract

The utility model relates to a grounding wire retractor relates to oil unloading protection technical field, the utility model discloses: shell, and the lower end and the front end open, the cover plate is connected with the upper end surface of shell front end through the hinge, the reel is set up in the shell inside, and is rotatively connected with the left and right side wall of shell, the limit ratchet wheel is set up in the left side plate outside of shell, and its axle is connected with the reel, and one group of ratchet teeth that bends to the same direction is arranged along its circumference, the pawl, one end is installed on the shell through the axle, and the other end is matched with the ratchet tooth, each ratchet tooth on the limit ratchet wheel is arc bending, and it includes the first surface to the surface to the bending direction and the second surface that deviates from the bending direction. The utility model is provided with the shell of fixed mounting on the frame, can avoid the damage of external environment to the grounding wire, is set up with the reel of rotatory connection in the shell, can recover the grounding wire to the shell 1 in the vehicle driving process, avoids being irradiated by ultraviolet.

Description

Technical Field

[0001] This utility model relates to the field of oil unloading protection technology, specifically a grounding wire expansion joint. Background Technology

[0002] Liquid oil products generate a large amount of static electricity during operation, which is the biggest safety hazard in liquid transportation. It is necessary to discharge all static electricity generated by oil trucks during operation to ensure driving safety. Currently, the solution for static grounding is to fix the static grounding wire to the vehicle frame with screws. Because the static grounding wire is relatively long, most people choose to fold it or coil it around the vehicle frame and rear bumper for fixation. However, this leaves the grounding wire completely exposed. Prolonged exposure to ultraviolet light can cause the grounding wire to become brittle and crack at the folded parts, preventing the static electricity from being fully released and creating a safety hazard. Utility Model Content

[0003] The purpose of this invention is to design a grounding wire expansion joint that can collect and protect the grounding wire.

[0004] This utility model includes:

[0005] The outer casing has openings at its lower and front ends;

[0006] The cover plate is connected to the upper end face of the front end of the outer casing via a hinge;

[0007] The winding shaft is located inside the housing and is rotatably connected to the left and right side walls of the housing.

[0008] A limiting ratchet is located on the outside of the left side plate of the housing. Its shaft is connected to the winding shaft, and a set of ratchet teeth that bend in the same direction are arranged along its circumference.

[0009] The pawl is mounted on the housing at one end via a shaft, and the other end engages with the ratchet teeth.

[0010] Each ratchet tooth on the limiting ratchet is curved, including a first surface facing the bending direction and a second surface away from the bending direction. The first surface and the second surface are connected by a locking block, wherein the second surface is smoothly connected to the locking block, and the maximum width of the locking block is greater than the distance between the upper ends of the first surface and the second surface, thereby forming a groove at the upper end of the first surface. The pawl is provided with a groove that allows each ratchet tooth to enter. The third surface adjacent to the first surface of the groove has the same shape as the first surface of the ratchet tooth, and the fourth surface adjacent to the second surface has a curvature greater than that of the second surface. The inner end of the groove on the pawl is provided with a slot adapted to the shape of the locking block, and a protrusion corresponding to the groove is provided between the slot and the third surface of the pawl.

[0011] Furthermore, the curvature of the second surface is greater than that of the first surface.

[0012] Furthermore, the winding shaft is provided with a countersunk hole for threading, and a threaded hole with an angle to the countersunk hole is connected to the countersunk hole at its inner end, and a clamping bolt is screwed into the threaded hole.

[0013] Furthermore, a connector is provided at the other end of the winding shaft.

[0014] Furthermore, the connector is a polygonal connector block.

[0015] Furthermore, the limiting ratchet is provided with 11 ratchet teeth. The angle between the line connecting the root A of the first surface ratchet tooth and the root B of the second surface ratchet tooth and the center point O of the limiting ratchet tooth is X degrees, where X is 20° to 15°. The top C of the first surface ratchet tooth and the top D of the second surface ratchet tooth are on the same straight line as the root A of the first surface ratchet tooth and the center point O of the limiting ratchet tooth. The arc length of the first surface is L1, and its arc radius is R1. The second surface is L2, and its arc radius is R2. <L2,R1<R2。

[0016] This invention features a housing fixedly mounted on the vehicle frame to prevent damage to the grounding wire from the external environment. Inside the housing is a winding shaft rotatably connected to it. By connecting the grounding wire to the winding shaft, static electricity generated during vehicle operation can be guided. During vehicle operation, the grounding wire can be retracted into the housing to prevent exposure to ultraviolet radiation. This invention also includes a matching limiting ratchet and pawl, allowing adjustment of the grounding wire's extension length to adapt to different vehicle conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2 This is a left view of an embodiment of the present utility model;

[0019] Figure 3 for Figure 2 A magnified view of a section at point E in the middle;

[0020] Figure 4 for Figure 2 A magnified view of a section at point F in the middle;

[0021] Figure 5 for Figure 1 The front view after removing the cover plate;

[0022] Figure 6 for Figure 5 Cross-sectional view along the GG direction;

[0023] The components are: 1. outer shell, 2. cover plate, 3. winding shaft, 4. limiting ratchet, 5. pawl, 6. ratchet tooth, 7. first surface, 8. second surface, 9. locking block, 10. third surface, 11. fourth surface, 12. groove, 13. polygonal connecting block, 14. wire through countersunk hole, 15. threaded hole, 16. clamping bolt. Detailed Implementation

[0024] by Figure 4 Define the up, down, left, right, front, and back directions in this embodiment.

[0025] As shown in the figure, this embodiment includes a housing 1 with openings at the lower and front ends. In use, the rear end of the housing 1 is fixedly installed to the frame or rear bumper of the oil tanker by welding or threaded connection. A cover plate 2 is provided on the front side of the housing 1. The upper end of the cover plate 2 is rotatably connected to the upper surface of the front end of the housing 1 via a hinge, allowing the grounding wire to be enclosed within the housing 1, preventing it from being exposed to ultraviolet radiation. In use, the grounding wire can be installed by lifting the cover plate 2, making operation convenient and avoiding obstruction. A winding shaft 3 is provided inside the housing 1, with its left and right ends rotatably connected to the side walls of the housing 1. A polygonal connecting block 16 is provided on the right side of the housing 1. In this embodiment, the polygonal connecting block 16 is hexagonal prism-shaped and fixedly connected to the right end of the winding shaft, allowing the rotation of the winding shaft 3 to be controlled by rotating the polygonal connecting block 16.

[0026] A limiting ratchet 4 is provided on the outer side of the left side plate of the outer casing 1. The central axis of the limiting ratchet 4 passes through the left side plate of the outer casing 1 to the right and is fixedly connected to the left end of the winding shaft 3, and can rotate with the winding shaft 3. A pawl 5 is provided above the limiting ratchet 4. The rear end of the pawl 5 is rotatably connected to the left side plate of the outer casing 1 through a shaft, and its front end hangs down naturally and cooperates with the outer periphery of the limiting ratchet 4.

[0027] The limiting ratchet 4 has a set of ratchet teeth 6 arranged in the circumferential direction. In this embodiment, there are 11 ratchet teeth 6.

[0028] Each ratchet 6 is curved in an arc and bends counterclockwise. The surface of each ratchet 6 facing the bending direction is the first surface 7. On the same ratchet 6, the side opposite to the first surface 7 is the second surface 8 facing away from the bending direction. The first surface 7 and the second surface 8 have a movable arc shape, gradually expanding outward from their apex to the root of the ratchet 6. Therefore, the curvature of the second surface 8 is greater than that of the first surface 7. A locking block 9 is provided at the tip of each ratchet 6. The first surface 7 and the second surface 8 are connected at the top of their ratchets through the surface of the locking block 9. The connection between the second surface 8 and the locking block 9 is made smooth by setting a rounded corner. The maximum width of the locking block 9 is greater than the distance between the upper ends of the first surface 7 and the second surface 8, thus forming a groove between the upper end of the first surface 7 and the locking block 9.

[0029] The pawl 5 has a groove at its front end that allows the ratchet teeth 6 to enter. The side of the groove adjacent to the first surface 7 is the third surface 10, which has the same shape and curvature as the first surface 7. The side of the groove adjacent to the second surface 8 is the fourth surface 11. The fourth surface 11 and the third surface 10 gradually expand outwards, and the expansion dimension is larger than the dimension of the tooth root of the first surface 7 and the second surface 8. Therefore, the curvature of the fourth surface 11 is greater than that of the second surface 8. When the ratchet teeth 6 engage with the groove of the pawl 5, the outwardly expanding structure of the ratchet teeth 6 and the groove can disperse the radial force on the pawl 5, reduce local stress concentration, and improve the service life of the pawl 5. When the limiting ratchet 4 and the pawl 5 wear due to long-term use, the contact between the fourth surface 11 and the ratchet teeth 6 at the engagement point can compensate for the wear, avoiding jamming due to point contact.

[0030] The inner end of the groove on the pawl 5 is provided with a groove 12 that is adapted to the shape of the block 9. The connection between the groove 12 and the fourth surface 11 is made smooth by opening a rounded corner. The other end is provided with a protrusion line corresponding to the groove line between it and the third surface 10. When the ratchet 6 engages with the groove of the pawl 5, the block 9 moves into the groove 12. The groove line and the protrusion line at the engagement point make the ratchet 6 and the pawl 5 fit together, reducing the phenomenon of "tooth skipping" in a vibrating environment.

[0031] The root of the ratchet on the first surface 7 of the ratchet 6 is set as point A, and the root of the ratchet on the second surface 8 is set as point B. The angle between the line connecting points A and B and the center point O of the limiting ratchet 4 is X degrees, where X is 20° to 15°. In this embodiment, X = 15°. The top of the ratchet on the first surface 7 of the ratchet 6 is set as point C, and the top of the ratchet on the second surface 8 is set as point D. Points C, D, and A are on the same straight line as the center point O of the limiting ratchet 4. The arc length of the first surface 7 is L1, and its radius is R1. The arc length of the second surface 8 is L2, and its radius is R2. In this embodiment, L1 = 15.2, R1 = 10.5, L2 = 20.8, and R2 = 14.

[0032] In this embodiment, the mounting shaft of the pawl 5 is located directly above the center of the limiting ratchet 4, which shortens the distance between the fulcrum and the engagement point of the pawl 5 and reduces the operating torque. When in use, the pawl 5 can fit against the limiting ratchet 4 by its own weight, and can quickly self-lock when the limiting ratchet 4 reverses, making operation convenient.

[0033] A countersunk hole 14 is provided on the circumferential surface of the winding shaft 3. A threaded hole 15 is provided on the radial side of the countersunk hole 14 at an angle to the countersunk hole 14. The inner end of the threaded hole 15 communicates with the countersunk hole 14 and is screwed with a clamping bolt 16. In use, after inserting one end of the static grounding wire connected to the frame into the countersunk hole 14, the clamping bolt 16 is screwed in to clamp and fix it.

[0034] In this embodiment, the outer casing 1 is first fixed to the frame by welding or bolting. One end of the static grounding wire connected to the frame is inserted into the countersunk hole 14 and secured with the clamping bolt 16. After completion, the grounding wire is completely wound around the winding shaft 3 when the polygonal connecting block 13 is rotated. To discharge static electricity, the pawl 5 is first lifted, and the polygonal connecting block 13 is rotated to release the grounding wire. After releasing it to a suitable length, the pawl 5 is lowered, so that the limiting ratchet 4 engages with the pawl 5. At this time, the extension length of the grounding wire is fixed. The other end of the grounding wire is connected to the grounding stake to discharge static electricity. After the static electricity of the frame is discharged, the oil loading and unloading process is carried out. After the oil loading and unloading is completed, the connection between the grounding wire and the grounding stake is disconnected, and the polygonal connecting block 13 is rotated to retract the grounding wire into the outer casing 1, completing the discharge of static electricity from the frame.

Claims

1. A grounding wire expansion joint, comprising: The outer casing has openings at its lower and front ends; The cover plate is connected to the upper end face of the front end of the outer casing via a hinge; The winding shaft is located inside the housing and is rotatably connected to the left and right side walls of the housing. A limiting ratchet is located on the outside of the left side plate of the housing. Its shaft is connected to the winding shaft, and a set of ratchet teeth that bend in the same direction are arranged along its circumference. The pawl is mounted on the housing at one end via a shaft, and the other end engages with the ratchet teeth. Its features are as follows: each ratchet tooth on the limiting ratchet is curved, including a first surface facing the bending direction and a second surface away from the bending direction. The first surface and the second surface are connected by the surface of the locking block. The second surface is smoothly connected to the locking block. The maximum width of the locking block is greater than the distance between the upper ends of the first surface and the second surface, thereby forming a groove at the upper end of the first surface. The pawl is provided with a groove that allows each ratchet tooth to enter. The third surface adjacent to the first surface of the groove has the same shape as the first surface of the ratchet tooth. The fourth surface adjacent to the second surface has a curvature greater than that of the second surface. The inner end of the groove on the pawl is provided with a slot adapted to the shape of the locking block, and a protrusion corresponding to the groove is provided between the slot and the third surface of the pawl.

2. The grounding wire expansion joint according to claim 1, characterized in that: The curvature of the second surface is greater than that of the first surface.

3. A grounding wire expansion joint according to claim 1 or 2, characterized in that: The winding shaft is provided with a countersunk hole for threading, and a threaded hole with an angle to the countersunk hole has its inner end connected to the countersunk hole. A clamping bolt is screwed into the threaded hole.

4. A grounding wire expansion joint according to claim 3, characterized in that: A connector is provided at the other end of the winding spool.

5. A grounding wire expansion joint according to claim 4, characterized in that: The connector is a polygonal connecting block.

6. A grounding wire expansion joint according to claim 1 or 2, characterized in that: The limiting ratchet has 11 ratchet teeth. The angle between the line connecting the root A of the first surface ratchet tooth and the root B of the second surface ratchet tooth and the center point O of the limiting ratchet tooth is X degrees, where X is 20° to 15°. The top C of the first surface ratchet tooth and the top D of the second surface ratchet tooth are on the same straight line as the root A of the first surface ratchet tooth and the center point O of the limiting ratchet tooth. The arc length of the first surface is L1, and its radius is R1. The second surface is L2, and its radius is R2. <L2,R1<R2。

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