CN102290746A - Screw tightening device - Google Patents

Abstract

A screw tightening device, comprising an outer sleeve (10) and a trapezoidal screw (3) inside, the two ends of the screw tightening device are upper and lower fork joints (2, 20) for tightening connection and The shaft pin (1) used for fixing, the bottom of the upper fork joint (2) at one end is screwed to the trapezoidal screw (3) that can move in the outer sleeve (10), and the bottom of the lower fork joint (20) at the other end is closed , support the other end of the trapezoidal screw (3) with the bearing (19). The screw tightening device comprises a nut transmission unit formed at the bottom end of the upper fork joint (2) of the trapezoidal screw rod (3) and the lower fork joint ( 20) A bevel gear transmission unit is formed at the bottom end, and a ratchet wrench (16) is arranged axially outside the bevel gear shaft (14). The trapezoidal screw of the screw tightening device of the present invention has a small helix angle and has a self-locking function; the structure is simple, light in weight and small in size; the gear transmission efficiency is high; the operation and maintenance are convenient and safe.

Description

Screw tightening device

technical field

The invention relates to a high-voltage line stringing tool, and more particularly relates to a screw tightening device as a line stringing tightening device.

Background technique

So far, a variety of tightening tools or devices have been used when stringing high-voltage wires, for example, there are multi-functional tighteners, ratchet take-ups, double-hook tighteners, steel wire ghost claw tighteners, and tiger head tighteners. Devices, ratchet lever hoists, chain chain hoists, wire rope traction hoists, etc. However, the various tightening tools or devices lack self-locking function, or have complex structures, heavy weight, and large volume, or the gear transmission efficiency is not high, the lifting speed of the screw is unsatisfactory, or the operation and maintenance are inconvenient and safe. Poor reliability.

For this reason, hydraulic tensioner is often used in recent high-voltage line stringing. However, due to the field operation of high-voltage line stringing, the environmental conditions are poor, oil leakage is easy, and maintenance is difficult.

Contents of the invention

In order to solve the above-mentioned problems, the present invention provides a screw tightening device suitable for field high-voltage line stringing operations with simple structure, convenient operation, flexibility, safety and reliability.

In order to solve the above problems, the technical scheme that the present invention takes is:

A screw tightening device, used for tightening high-voltage wires, includes an outer sleeve 10, a transmission sleeve 9 and a trapezoidal screw 3 that can move relative to the outer sleeve 10, and is characterized in that,

The two ends of the screw tightening device are respectively the upper and lower fork joints 2, 20 for tightening the connection, and the bottom of the upper fork joint 2 has screw holes for screwing the trapezoidal screw 3, and the trapezoidal screw 3 through and can move relative to the transmission sleeve 9,

The bottom of the lower fork joint 20 at the other end of the screw tightening device is closed, and one end of the trapezoidal screw 3 is supported by a bearing 19,

At the bottom section of the trapezoidal screw 3 close to the end of the upper fork joint 2, a nut transmission unit placed in the transmission gear box 6 is arranged,

The nut drive unit includes:

Through the guide nut 7 screwed and driven by the thrust bearing 5 and the outer circumference of the trapezoidal screw rod 3, the transmission sleeve 9 fixedly connected with the guide nut 7 by the nut key 8 embedded in the outer circumference of the guide nut 7, the transmission sleeve 9 extends to The bottom of the lower fork joint 20 at the other end of the trapezoidal screw rod 3,

The trapezoidal screw rod 3 supported on the bottom side of the lower fork joint 20 with the bearing 19 forms a bevel gear transmission unit placed in the gear box 18,

The bevel gear transmission unit includes:

The bevel gear 12 and the bevel gear shaft 14 meshed with the bevel gear 12 through the bearing sleeve 13, the bevel gear shaft 14 is engaged with the bevel gear 12 through the bearing sleeve 13,

A ratchet wrench 16 is arranged axially outside the bevel gear shaft 14 .

According to the screw tightening device of the present invention, it is characterized in that there is a guide key on the end surface of the bearing cover, and the guide key can move outward.

According to the thread tightening device of the present invention, it is characterized in that the thrust bearing 5 is arranged between the bearing cap and the lead nut.

According to the screw tightening device of the present invention, the wrench is a two-way ratchet wrench.

According to the screw tightening device of the present invention, it is characterized in that a bearing cover 4 for closing the transmission gearbox 6 is provided at the bottom end of the fork joint 2 on the trapezoidal screw 3, and the bevel gear transmission unit is provided on the gear Box 18.

According to the screw tightening device of the present invention, it is characterized in that the upper fork joint 2 is provided with a connection hole, and the shaft pin 1 for tightening the connection is screwed in the connection hole,

According to the thread tightening device of the present invention, a bushing 17 is arranged between the bevel gear 12 and the bearing 19 of the bevel gear transmission unit.

According to the screw tightening device of the present invention, the structure is simple, the weight and the volume are small; in addition, the helix angle of the trapezoidal screw of the line stringing tightening device of the present invention is small, the gear transmission efficiency is high, the lifting speed of the trapezoidal screw is fast, and it has the advantages of Self-locking function. The operation and maintenance are convenient and the reliability is high; in addition, the two-way ratchet wrench is located on the center line of the tensioning device, and does not collide with nearby high-voltage wires, so the operation is safe.

Description of drawings

Fig. 1 is a structural schematic diagram of the screw tightening device of the present invention.

Fig. 2 is an outline view of the screw tightening device of the present invention.

In the figure, 1 is the shaft pin, 2 is the upper fork joint, 3 is the trapezoidal screw, 4 is the bearing cover, 5 is the thrust bearing, 6 is the transmission sleeve, 7 is the guide nut, 8 is the nut key, and 9 is the transmission sleeve 10 is an outer sleeve, 11 is a gear key, 12 is a bevel gear, 13 is a bearing sleeve, 14 is a bevel gear shaft, 15 is a retaining ring, 16 is a two-way ratchet wrench, 17 is a bushing, 18 is a gear box, 19 Be a bearing, and 20 are lower fork joints.

Detailed ways

The screw thread tightening device of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

A screw tightening device for high-tension wire tensioning, comprising an outer sleeve 10 and a trapezoidal screw 3 inside. The two ends of the screw tightening device are the upper fork joints 2, 20 for tightening connection and the shaft pin 1 for fixing that is inserted in the connecting hole of the upper fork joint 2. Screw holes are provided at the bottom of the upper fork joint 2 at one end of the screw tightening device for screwing the trapezoidal screw 3 that can move in the outer sleeve 10, and the bottom of the lower fork joint 20 at the other end of the screw tightening device is closed , support the other end of the trapezoidal screw 3 with the bearing 19. The trapezoidal screw rod 3 (upper section) screwed on the bottom of the upper fork joint 2 forms a nut transmission unit.

The nut drive unit includes:

Transmission gear box 6, in the transmission gear box 6, through thrust bearing 5, the lead nut 7 that is screwed with the trapezoidal screw rod 3 outer periphery to drive, the nut key 8 that insert groove is arranged on the lead nut 7 outer periphery, by the promotion of lead nut 7 can The drive sleeve 9 that moves along the outside of the trapezoidal screw 3 and inside the outer sleeve 10 . The transmission sleeve 9 extends to the bottom of the lower fork joint 20 at the other end of the trapezoidal screw 3, and the trapezoidal screw 3 (lower section) screwed and fixed on the bottom of the lower fork joint 20 forms a bevel gear transmission unit.

The bevel gear transmission unit includes:

The bevel gear 12 arranged in the gearbox 18 and the bevel gear shaft 14 for vertical meshing transmission, the bevel gear 12 is connected to the transmission sleeve 9 with the gear key 11, the bevel gear shaft 14 is vertically meshed with the bevel gear 12 for transmission through the bearing sleeve 13, the bevel gear The gear shaft 14 is provided with a ratchet wrench 16 axially connected to the outside.

In this embodiment, a guide key is provided on the end surface of the bearing cover, and the guide key can move outward. There is a thrust bearing 5 between the bearing cover and the guide nut.

In this embodiment, the wrench is a two-way ratchet wrench, and the bevel gear transmission unit is arranged in the gear box 18 .

In this embodiment, a bearing cover 4 for closing the transmission gearbox 6 is provided at the bottom end of the fork joint 2 on the trapezoidal screw 3 . A guide key is provided at the closed end of the sleeve of the trapezoidal screw.

In this embodiment, when the screw tightening device is in operation, the upper fork joint 2 at one end of the screw tightening device hangs on the high voltage line, and the other end of the fork joint serves as a fixed end to hang on the iron frame.

The two-way ratchet handle of the line stringing tightening device that swings back and forth can drive the bevel gear transmission unit to rotate in one direction by the two-way ratchet, and the bevel gear transmission unit rotates. That is, the bevel gear shaft 14 is vertically meshed with the bevel gear 12 through the bearing sleeve 13, and the bevel gear 12 rotates to drive the transmission sleeve 9 that can move along the outside of the trapezoidal screw 3 and the inside of the outer sleeve 10 to rotate. The transmission sleeve 9 is screwed to the trapezoidal screw 3 through the nut key 8 and the guide nut 7 arranged on the outer periphery of the guide nut 7, so that the trapezoidal screw 3 moves up and down relative to the transmission sleeve 9, and the up and down of the trapezoidal screw 3 moves relative to the transmission sleeve 9. , drive the upper fork joint 2 to move up and down, and the upper fork joint 2 moves up and down to tighten the high-tension line that it hangs.

As shown in the figure, the trapezoidal screw of the screw tightening device stretches or descends, and only needs to change the direction of the two-way ratchet wrench 11, and the trapezoidal screw 7 can be stretched or descended.

According to the screw tightening device of the present invention, the structure is simple, the weight and the volume are small; in addition, the helix angle of the trapezoidal screw of the screw tightening device of the present invention is small, the gear transmission efficiency is high, the lifting speed of the trapezoidal screw is fast, and it has self-locking Function. The operation and maintenance are convenient and the reliability is high; in addition, the two-way ratchet wrench is located on the center line of the tensioning device, and does not collide with nearby high-voltage wires, so the operation is safe.

Claims (7)

1. A screw tightening device for tightening high-voltage wires, including an outer sleeve (10) and a transmission sleeve (9) that can move relative to the outer sleeve (10) and a trapezoidal screw (3) , characterized in that, The two ends of the screw tightening device are respectively upper and lower fork-shaped joints (2, 20) for tightening the connection, and the bottom of the upper fork-shaped joint (2) has a screw hole for screwing the trapezoidal screw (3) , the trapezoidal screw (3) penetrates and can move relative to the transmission sleeve (9), The bottom of the lower fork joint (20) at the other end of the screw tightening device is closed, and one end of the trapezoidal screw (3) is supported by a bearing (19). At the bottom of the trapezoidal screw (3) close to the end of the upper fork joint (2), a nut transmission unit placed in the transmission gear box (6) is arranged, The nut drive unit includes: Through the thrust bearing (5) and the trapezoidal screw (3) outer circumference threaded transmission guide nut (7), through the nut key (8) embedded in the outer circumference of the guide nut (7) and the transmission of the guide nut (7) fixed connection Sleeve (9), the transmission sleeve (9) extends to the bottom of the lower fork joint (20) at the other end of the trapezoidal screw (3), The trapezoidal screw (3) supported by the bearing (19) on the bottom side of the lower fork joint (20) forms a bevel gear transmission unit placed in the gear box (18), The bevel gear transmission unit includes: The bevel gear (12) and the bevel gear shaft (14) meshed with the bevel gear (12) through the bearing sleeve (13), the bevel gear (12) is connected to the transmission sleeve (9) with the gear key (11), A ratchet wrench (16) is arranged axially outside the bevel gear shaft (14). 2. The screw tightening device according to claim 1, characterized in that there is a guide key on the end surface of the bearing cover, and the guide key can move outward. 3. The screw tightening device according to claim 1, characterized in that, the thrust bearing (5) is arranged between the bearing cover and the lead nut. 4. The screw tightening device according to claim 1, wherein the wrench is a two-way ratchet wrench. 5. The screw tightening device according to claim 1, characterized in that, a bearing cover (4) for closing the transmission gearbox (6) is provided at the bottom end of the upper fork joint (2) of the trapezoidal screw (3) , the bevel gear transmission unit is arranged in the gear box (18). . 6. The screw tightening device according to claim 1, characterized in that, the upper fork joint (2) is provided with a connection hole, and the shaft pin (1) for tightening the connection is screwed in the connection hole, 7. The screw tightening device according to claim 1, characterized in that, a bushing (17) is arranged between the bevel gear (12) and the bearing (19) of the bevel gear transmission unit.

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