Quick linking device and linking method for electric power insulation operating rod

Abstract

The invention discloses a quick linking device and method for an electric insulation operating rod, and the device comprises a connecting piece housing and an operating rod body, the operating rod body is inserted in the connecting piece housing, and the connecting piece housing is internally provided with a connecting mechanism with a spiral limiting rod. The connecting mechanism comprises a spiral limiting rod which is rotationally installed in the connecting piece shell and used for being connected with the operating rod body, an auxiliary mechanism with a worm gear and a worm is arranged in the connecting piece shell, and the worm gear is fixedly installed at one end of the spiral limiting rod. Automatic rotation locking of the spiral limiting rod is achieved, rapid connection of insertion and locking is completed, the connection efficiency is greatly improved, zero rotation loosening after connection is ensured through the self-locking characteristic of the worm gear and the worm, meanwhile, elastic deformation is generated when the double spiral grooves are meshed, a contact surface gap is smaller, zero-clearance fit is ensured, and the service life of the spiral limiting rod is prolonged. Therefore, the operation rod body is fixed and connected.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power insulation operating rods, and particularly relates to a quick connection device and a connection method for an electric power insulation operating rod. Background Art

[0002] In the power system, the insulation operating rod is the core tool for live working. Its connection stability and operating efficiency are directly related to the operating safety and efficiency. The insulation rod is the most commonly used safety tool in the substation operation and test and maintenance departments. It is a tool made of an insulating tube or rod with end fittings, and usually includes an operating rod, a binding wire rod, a hook head rod, a general operating rod, etc.

[0003] The traditional connection method of the insulation operating rod mainly uses snap fixation. The connection lacks a self-locking mechanism and is prone to loosening when subjected to vibration or torque reaction during operation. Especially under harsh weather conditions, the connection strength is greatly reduced, resulting in an increased risk of accidental detachment of the operating rod, threatening the safe operation of the power grid. At the same time, the traditional connection method cannot effectively reduce the displacement or rotation caused by the operating force, and cannot fully ensure the stability and reliability of the operating rod in different operating scenarios. Summary of the Invention

[0004] The purpose of the present invention is to provide a quick connection device and a connection method for an electric power insulation operating rod to solve the problems raised in the above background art, that is, the connection lacks a self-locking mechanism and is prone to loosening when subjected to vibration or torque reaction during operation. Especially under harsh weather conditions, the connection strength is greatly reduced, resulting in an increased risk of accidental detachment of the operating rod.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A quick connection device for an electric power insulation operating rod, including a connector housing and an operating rod body. The operating rod body is inserted into the interior of the connector housing. A connection mechanism with a spiral limiting rod is arranged inside the connector housing. The connection mechanism includes a spiral limiting rod rotatably installed inside the connector housing for connecting with the operating rod body. An auxiliary mechanism with a worm gear and a worm is arranged inside the connector housing. The worm gear is fixedly installed at one end of the spiral limiting rod. The worm is rotatably installed inside the connector housing, and the worm gear for stably connecting the spiral limiting rod and the operating rod body meshes with the worm. A gear is fixedly installed at one end of the worm. A limiting ring is installed on the operating rod body. A rack bar is clamped inside the limiting ring. The rack bar is inserted into the interior of the connector housing and meshes with the gear.

[0006] As a preferred technical solution of the present invention, a first spiral groove is formed on the outer surface of the spiral limiting rod, a second spiral groove for fitting the spiral limiting rod is formed at one end of the operating rod body close to the spiral limiting rod, and the spiral limiting rod is inserted into the second spiral groove. A spiral support strip for reducing the thread clearance is installed between the first spiral groove and the second spiral groove.

[0007] As a preferred technical solution of the present invention, the cross-sections of both ends of the spiral support strip are arc-shaped. An oily sponge adsorbed with lubricating oil is installed inside the spiral support strip. Oil outlet holes are formed between the space where the oily sponge is located and the first spiral groove and the second spiral groove.

[0008] As a preferred technical solution of the present invention, a threaded ejector rod is threadedly installed on the connecting piece housing. A spherical block is arranged between one end of the threaded ejector rod and one end of the worm, and both the threaded ejector rod and the worm are rotatably connected to the surface of the spherical block. A long cylinder is installed inside the connecting piece housing, and the rack rod is inserted into the long cylinder.

[0009] As a preferred technical solution of the present invention, a fastening ring for limiting the spiral limiting rod is arranged on the inner bottom wall of the connecting piece housing. A cavity for reducing air pressure is formed between the fastening ring and the spiral limiting rod.

[0010] As a preferred technical solution of the present invention, a stabilizing mechanism with a rubber ring is arranged inside the connecting piece housing. A plugging piece is installed inside the connecting piece housing, and the rubber ring for increasing the resistance of the operating rod body is installed on the inner wall of the plugging piece close to the spiral limiting rod.

[0011] As a preferred technical solution of the present invention, a plurality of the rubber rings are connected in series by a plurality of connecting ropes. A plurality of air vent holes for buffering and pressure relief are formed on the surface of the rubber ring. A buffer spring for pressurizing the operating rod body is installed on the inner bottom wall of the plugging piece close to the operating rod body.

[0012] As a preferred technical solution of the present invention, a limiting mechanism with an assembly head is arranged inside the connecting piece housing close to the plugging piece. The assembly head is installed on the inner wall of the connecting piece housing. A plurality of sliding plates are fixedly installed on the surface of the assembly head close to the operating rod body. A sliding groove is formed on the surface of the operating rod body close to the connecting piece housing. The sliding plates are slidably installed inside the sliding groove. A through groove for exhausting air and relieving pressure is formed on the surface of the sliding plate, and the through groove communicates the inner space of the connecting piece housing with the outside. The side ends of the sliding plates close to the sliding groove are all arranged in an arc shape.

[0013] As a preferred technical solution of the present invention, symmetrically arranged connecting piece housings are arranged at one end of the operating rod body, and an insulating connector is fixedly installed at the free end of the operating rod body.

[0014] As a preferred technical solution of the present invention, a method for quickly connecting an electric insulating operating rod comprises the following connecting steps: Step 1: Align the free end of the operating rod body to be connected with the insertion port of the connector housing, and ensure that the opening direction of the second spiral groove at the end of the operating rod body is aligned with the axial direction of the spiral limiting rod inside the connector housing; Step 2: Insert the second spiral groove at one end of the operating rod body into the spiral limiting rod. At this time, the displacement of the operating rod body drives the rack rod to move inward synchronously. The rack rod meshes with the gear at the end of the worm to drive the worm to rotate. The worm drives the spiral limiting rod to rotate through the meshing worm wheel. The first spiral groove and the second spiral groove of the operating rod body form a double spiral bite. The spiral support bar is squeezed and deformed in the thread gap to reduce the gap. Step 3: When the operating rod body is fully inserted to the marked position, the spiral limit rod stops rotating due to the self-locking characteristics of the worm wheel and the worm. At this time, the spiral support bar reaches the maximum compression amount, and the double spiral groove achieves zero clearance fit; Step 4: When disassembling, screw in the threaded push rod and push the worm axially out of the worm wheel through the ball block structure to release the self-locking state.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes automatic rotation and locking of the spiral limit rod by triggering the linkage mechanism of rack-gear-worm-worm wheel when the operating rod body is inserted into the connector housing, completing the quick connection of insertion and locking, greatly improving the connection efficiency, and the self-locking characteristics of the worm wheel and worm ensure zero rotation looseness after connection.

[0016] 2. The present invention is installed by interlocking the spiral support strips and adopts an arc end face design, which produces elastic deformation when the double spiral grooves are engaged, making the contact surface gap smaller and ensuring zero-gap fit, thereby achieving fixation and connection of the operating rod body. At the same time, the oily sponge achieves dynamic lubrication through the oil outlet hole, reduces the friction coefficient, solves the wear problem caused by direct friction of the metal threads, and extends the service life.

[0017] 3. The present invention forms an air buffer zone through the fastening ring cavity design, which compensates for the pressure difference caused by thermal expansion and contraction within a special weather temperature range, avoids connection failure in extreme environments, and the slide plate slot achieves internal and external air pressure balance, eliminating the increase in operating resistance caused by regional air pressure differences.

[0018] 4. When disassembling, the present invention can push the worm axially away from the worm wheel by rotating the threaded push rod, thereby releasing the self-locking state, thereby facilitating the rapid disassembly of the operating rod body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal structure of the connector housing of the present invention; Figure 3 Schematic diagram of the internal structure of the assembly head of the present invention; Figure 4 Schematic diagram of the internal structure of the plug member of the present invention; Figure 5 Schematic diagram of the internal structure of the operating rod body of the present invention; Figure 6 Schematic diagram of the worm and worm gear structure of the present invention; Figure 7 Schematic diagram of the spiral limiting rod structure of the present invention; Figure 8 Schematic diagram of the cross-sectional structure of the spiral support bar of the present invention; Figure 9 Schematic diagram of the rubber ring structure of the present invention; Figure 10 Schematic diagram of the slide plate and the cross-sectional structure of the slide plate of the present invention.

[0020] In the figure: 1. Operating rod body; 2. Connector housing; 3. Limiting mechanism; 31. Assembly head; 32. Slide plate; 4. Stabilizing mechanism; 41. Plug member; 42. Rubber ring; 43. Vent hole; 44. Connecting rope; 45. Buffer spring; 5. Fastening ring; 6. Connecting mechanism; 61. Spiral limiting rod; 62. First spiral groove; 63. Second spiral groove; 64. Spiral support bar; 65. Oil sponge; 66. Oil outlet hole; 7. Auxiliary mechanism; 71. Limiting ring; 72. Rack bar; 73. Long tube; 74. Threaded ejector rod; 75. Gear; 76. Worm; 77. Worm gear; 8. Insulating connector. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-10 , the present invention provides a fast connection device for a power insulation operating rod, including a connector housing 2 and an operating rod body 1. The operating rod body 1 is inserted into the inside of the connector housing 2. A connecting mechanism 6 with a spiral limiting rod 61 is provided inside the connector housing 2. The connecting mechanism 6 includes a spiral limiting rod 61 rotatably installed inside the connector housing 2 for connecting with the operating rod body 1.

[0023] Among them, when the operating rod body 1 is quickly connected to the connecting piece housing 2, the operating rod body 1 is inserted into the interior of the connecting piece housing 2, and the operating rod body 1 is threadedly connected to the spiral limiting rod 61. At this time, the operating rod body 1 can be continuously fixed and inserted to achieve the connection.

[0024] In the technical solution of the embodiment of the present application, an auxiliary mechanism 7 with a worm gear 77 and a worm 76 is provided inside the connecting piece housing 2. The worm gear 77 is fixedly installed at one end of the spiral limiting rod 61. The worm 76 is rotatably installed inside the connecting piece housing 2, and the worm gear 77 used for stably connecting the spiral limiting rod 61 and the operating rod body 1 meshes with the worm 76. A gear 75 is fixedly installed at one end of the worm 76. A limiting ring 71 is installed on the operating rod body 1, and a rack bar 72 is clamped inside the limiting ring 71. The rack bar 72 is inserted into the interior of the connecting piece housing 2 and meshes with the gear 75.

[0025] Among them, when the second thread groove at one end of the operating rod body 1 is sleeved on the spiral limiting rod 61, at this time, the operating rod body 1 can drive the rack bar 72 to move. The rack bar 72 drives the gear 75 to rotate. The gear 75 drives the worm 76 to rotate. The worm 76 drives the worm gear 77 to rotate. The worm gear 77 drives the spiral limiting rod 61 to rotate. Thus, the operating rod body 1 is threadedly connected to the spiral limiting rod 61. At this time, the operating rod body 1 can be continuously fixed. And when the worm gear 77 and the worm 76 cooperate to rotate, it can just achieve the synchronous and equidistant rotation of the rack bar 72 and the spiral limiting rod 61, so that the spiral limiting rod 61 rotates as the rack bar 72 moves, which can ensure the stable installation of the operating rod body 1 and the spiral limiting rod 61.

[0026] In some embodiments, a first spiral groove 62 is formed on the outer surface of the spiral limiting rod 61. A second spiral groove 63 for fitting the spiral limiting rod 61 is formed at one end of the operating rod body 1 close to the spiral limiting rod 61. And the spiral limiting rod 61 is inserted into the interior of the second spiral groove 63. A spiral support bar 64 for reducing the thread clearance is installed between the first spiral groove 62 and the second spiral groove 63.

[0027] Among them, when the spiral support bar 64 is installed inside the second spiral groove 63, at this time, when the spiral limiting rod 61 and the operating rod body 1 are installed, with the cooperation of the spiral support bar 64, the contact surface gap between them can be smaller, ensuring zero-clearance fit, so as to realize the fixation and connection of the operating rod body 1.

[0028] In some embodiments, the cross sections at both ends of the spiral support bar 64 are arc-shaped. An oil sponge 65 adsorbed with lubricating oil is installed inside the spiral support bar 64. Oil outlet holes 66 are formed between the space where the oil sponge 65 is located and the first spiral groove 62 and the second spiral groove 63.

[0029] Among them, when the spiral support bar 64 is in use, through the mutual pressing and rotation of the spiral limiting rod 61 and the operating rod body 1, the oily sponge 65 with lubricating oil inside the spiral support bar 64 can be pressurized. The oily sponge 65 realizes dynamic lubrication through the oil outlet holes 66, reduces the friction coefficient, solves the wear problem caused by direct friction of metal threads, prolongs the service life, and enables smoother installation and higher efficiency.

[0030] In some embodiments, a threaded ejector rod 74 is threadedly installed on the connecting piece housing 2. A ball block is provided between one end of the threaded ejector rod 74 and one end of the worm 76, and both the threaded ejector rod 74 and the worm 76 are rotatably connected to the surface of the ball block. A long cylinder 73 is installed inside the connecting piece housing 2, and the rack bar 72 is inserted into the long cylinder 73.

[0031] Among them, by rotating the threaded ejector rod 74 to push the worm 76 to axially disengage from the worm gear 77 and release the self-locking state, it is convenient to quickly disassemble the operating rod body 1; by providing the long cylinder 73, the rack bar 72 can be protected, enabling the rack bar 72 to move along a predetermined route and enabling more stable installation of the operating rod body 1.

[0032] In some embodiments, a fastening ring 5 for limiting the spiral limiting rod 61 is provided on the inner bottom wall of the connecting piece housing 2, and a cavity for reducing air pressure is formed between the fastening ring 5 and the spiral limiting rod 61.

[0033] Among them, an air buffer zone is formed through the cavity design of the fastening ring 5 to compensate for the pressure difference caused by thermal expansion and contraction within a special weather temperature range, avoiding connection failure in extreme environments, and the through groove of the slide plate 32 realizes internal and external air pressure balance, eliminating the increase in operating resistance caused by air pressure difference in different regions.

[0034] In some embodiments, a stabilizing mechanism 4 with a rubber ring 42 is provided inside the connecting piece housing 2. A plug member 41 is installed inside the connecting piece housing 2, and the rubber ring 42 for increasing the resistance of the operating rod body 1 is installed on the inner wall of the plug member 41 close to the spiral limiting rod 61.

[0035] Among them, when the operating rod body 1 is inserted into the connecting piece housing 2, the buffer spring 45 is compressed to generate a continuous axial pre-tightening force, which, combined with the radial expansion of the rubber ring 42, increases the contact pressure between the spiral support bar 64 and the double spiral groove, ensuring zero-clearance fit.

[0036] In some embodiments, multiple rubber rings 42 are connected in series by multiple connecting ropes 44. Multiple air holes 43 for buffering and pressure relief are provided on the surface of the rubber ring 42, and a buffer spring 45 for pressurizing the operating rod body 1 is installed on the inner bottom wall of the plug member 41 close to the operating rod body 1.

[0037] Among them, multiple series-connected rubber rings 42 are radially expanded under the pressure of the buffer spring 45, forming an interference fit with the operating rod body 1, effectively blocking external dust and moisture. By providing a plurality of ventilation holes 43 on the surface of the rubber ring 42, the ventilation holes 43 cause local stress relaxation of the rubber ring 42 during compression, avoiding damage to the rubber ring 42 due to excessive compression caused by thermal expansion. Moreover, the thermal deformation differences between the buffer spring 45 and the spiral support bar 64 are automatically compensated by the spring compression amount, avoiding high-temperature jamming or low-temperature loosening.

[0038] In some embodiments, a limiting mechanism 3 with an assembly head 31 is provided inside the connector housing 2 near the plugging member 41. The assembly head 31 is installed on the inner wall of the connector housing 2. A plurality of sliding plates 32 are fixedly installed on the surface of the assembly head 31 close to the operating rod body 1. A chute is provided on the surface of the operating rod body 1 close to the connector housing 2. The sliding plates 32 are slidably installed inside the chute. Through grooves for exhausting air and pressure are provided on the surface of the sliding plates 32, and the through grooves communicate the internal void of the connector housing 2 with the outside. The side ends of the sliding plates 32 close to the chute are all set in an arc shape.

[0039] Among them, when the operating rod body 1 is installed, the chute on the operating rod body 1 is fitted and installed with the sliding plates 32 on the inner wall of the assembly head 31, so that the operating rod body 1 is positioned and installed. Moreover, during the insertion and extraction of the operating rod body 1, the through grooves on the sliding plates 32 and the ventilation holes 43 form a double exhaust channel, enabling the internal air pressure of the connector housing 2 to quickly balance with the outside, eliminating the operation resistance fluctuation in the high-altitude low-pressure environment, and improving the quick installation of the operating rod body 1.

[0040] In some embodiments, symmetrically installed connector housings 2 are provided at one end of the operating rod body 1, and an insulating connector 8 is fixedly installed at the free end of the operating rod body 1.

[0041] A method for quickly chain-connecting a power insulating operating rod, and its connection steps are as follows: Step 1: Align the free end of the operating rod body 1 to be connected with the insertion port of the connector housing 2, and ensure that the opening direction of the second spiral groove 63 at the end of the operating rod body 1 is axially aligned with the spiral limiting rod 61 inside the connector housing 2; Step 2: Sleeve the second spiral groove 63 at one end of the operating rod body 1 onto the spiral limiting rod 61. At this time, the displacement of the operating rod body 1 drives the rack bar 72 to move inward synchronously. The rack bar 72 meshes with the gear 75 at the end of the worm 76, driving the worm 76 to rotate. The worm 76 drives the spiral limiting rod 61 to rotate through the engaged worm gear 77. Its first spiral groove 62 and the second spiral groove 63 of the operating rod body 1 form a double spiral bite, and the spiral support bar 64 is squeezed and deformed in the thread gap, reducing the void; Step 3: When the operating rod body 1 is fully inserted into the marked position, the spiral limiting rod 61 stops rotating under the self-locking characteristics of the worm gear 77 and the worm 76. At this time, the spiral support bar 64 reaches the maximum compression amount, and the double spiral groove realizes zero-clearance fit; Step 4: When disassembling, screw in the threaded ejector rod 74, and push the worm 76 axially away from the worm gear 77 through the ball block structure to release the self-locking state.

[0042] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A quick-connect device for an electric insulating operating rod, comprising a connector housing (2) and an operating rod body (1), characterized in that: The operating rod body (1) is inserted into the interior of the connecting piece housing (2); a connecting mechanism (6) having a screw limit rod (61) is arranged inside the connecting piece housing (2); the connecting mechanism (6) comprises a screw limit rod (61) rotatably mounted inside the connecting piece housing (2) and used for connecting to the operating rod body (1); An auxiliary mechanism (7) having a worm wheel (77) and a worm (76) is arranged inside the connector housing (2); the worm wheel (77) is fixedly mounted on one end of the spiral limiting rod (61); the worm (76) is rotatably mounted inside the connector housing (2); and the worm wheel (77) and the worm (76) are meshed for stably connecting the spiral limiting rod (61) and the operating rod body (1); a gear (75) is fixedly mounted on one end of the worm (76); a limiting ring (71) is mounted on the operating rod body (1); a rack rod (72) is clamped inside the limiting ring (71); the rack rod (72) is inserted inside the connector housing (2) and meshes with the gear (75).

2. The electric insulating operating rod quick connection device according to claim 1, characterized in that: The outer surface of the spiral limiting rod (61) is provided with a first spiral groove (62); an end of the operating rod body (1) close to the spiral limiting rod (61) is provided with a second spiral groove (63) for engaging with the spiral limiting rod (61); the spiral limiting rod (61) is inserted into the interior of the second spiral groove (63); and a spiral support bar (64) for reducing thread gap is installed between the first spiral groove (62) and the second spiral groove (63).

3. The electric insulating operating rod quick connection device according to claim 2, characterized in that: Both ends of the spiral support strip (64) have arc-shaped cross-sections. An oily sponge (65) adsorbed with lubricating oil is installed inside the spiral support strip (64). Oil outlet holes (66) are provided between the space where the oily sponge (65) is located and the first spiral groove (62) and the second spiral groove (63).

4. The electric insulating operating rod quick connection device according to claim 1, characterized in that: The connector housing (2) is threadedly mounted with a threaded push rod (74), a ball block is arranged between one end of the threaded push rod (74) and one end of the worm (76), and the threaded push rod (74) and the worm (76) are both rotatably connected to the surface of the ball block, and a long tube (73) is installed inside the connector housing (2), and the rack rod (72) is inserted inside the long tube (73).

5. The electric insulating operating rod quick connection device according to claim 1, characterized in that: The inner bottom wall of the connector housing (2) is provided with a fastening ring (5) for limiting the position of the spiral limiting rod (61), and a cavity for reducing air pressure is provided between the fastening ring (5) and the spiral limiting rod (61).

6. The electric insulating operating rod quick connection device according to claim 1, characterized in that: A stabilizing mechanism (4) with a rubber ring (42) is provided inside the connector housing (2), a plug (41) is installed inside the connector housing (2), and the rubber ring (42) for increasing the resistance of the operating rod body (1) is installed on the inner wall of the plug (41) close to the spiral limiting rod (61).

7. The electric insulating operating rod quick connection device according to claim 6, characterized in that: The plurality of rubber rings (42) are connected in series using a plurality of connecting ropes (44); a plurality of air holes (43) for buffering and pressure relief are provided on the surface of the rubber ring (42); and a buffer spring (45) for pressurizing the operating rod body (1) is installed on the plug (41) near the inner bottom wall of the operating rod body (1).

8. The electric insulating operating rod quick connection device according to claim 6, characterized in that: A limiting mechanism (3) having an assembly head (31) is arranged inside the connector housing (2) near the plugging member (41); the assembly head (31) is mounted on the inner wall of the connector housing (2); a plurality of slide plates (32) are fixedly mounted on the surface of the assembly head (31) near the operating rod body (1); a slide groove is provided on the surface of the operating rod body (1) near the connector housing (2); the slide plate (32) is slidably mounted inside the slide groove; a through groove for exhausting air and pressure is provided on the surface of the slide plate (32); the through groove connects the internal space of the connector housing (2) with the outside; and the side ends of the slide plates (32) near the slide groove are all arranged in an arc shape.

9. The electric insulating operating rod quick connection device according to claim 1, characterized in that: One end of the operating rod body (1) is provided with a symmetrically mounted connector housing (2), and the free end of the operating rod body (1) is fixedly mounted with an insulating connector (8).

10. A method for quickly connecting an electric insulating operating rod, wherein the connecting steps are: Step 1: Align the free end of the operating rod body (1) to be connected with the insertion port of the connector housing (2), ensuring that the opening direction of the second spiral groove (63) at the end of the operating rod body (1) is axially aligned with the spiral limiting rod (61) inside the connector housing (2); Step 2: insert the second spiral groove (63) at one end of the operating rod body (1) into the spiral limiting rod (61), and the displacement of the operating rod body (1) drives the rack rod (72) to move inward synchronously, and the rack rod (72) meshes with the gear (75) at the end of the worm (76), driving the worm (76) to rotate, and the worm (76) drives the spiral limiting rod (61) to rotate through the meshing worm wheel (77), and the first spiral groove (62) and the second spiral groove (63) of the operating rod body (1) form a double spiral bite, and the spiral support bar (64) is squeezed and deformed in the thread gap to reduce the gap; Step 3: When the operating rod body (1) is fully inserted to the marked position, the spiral limit rod (61) stops rotating due to the self-locking characteristics of the worm wheel (77) and the worm (76). At this time, the spiral support bar (64) reaches the maximum compression amount, and the double spiral groove achieves zero clearance fit; Step 4: When disassembling, screw in the threaded push rod (74) to push the worm (76) axially out of the worm wheel (77) through the ball block structure to release the self-locking state.

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