CN104828729A - Tension maintaining device - Google Patents

Abstract

The invention discloses a tension maintaining device, which comprises a first gear and a second gear set on the same gear shaft; the first gear is fixed on a gear shaft and connected with a gear transmission system of a wire rope guide wheel; The two ends of the gear shaft are equipped with rotating bearings; the second gear is sleeved on the gear shaft through a one-way bearing, and a bushing is arranged between the second gear and the one-way bearing, and the gear transmission system of the second gear and the motor drives the drum Connection; static friction discs are fixed on both sides of the second gear, the static friction discs are correspondingly pressed against a dynamic friction disc, and the dynamic friction discs are fixedly socketed with the outer ring of the one-way bearing in the circumferential direction. The invention adopts a purely mechanical structure to realize the constant tension force of the hoisting wire rope, has a simple structure and is ingeniously designed. It can be adjusted by the pressing force of the friction disc.

Description

tension maintaining device

technical field

The invention relates to a tension maintaining device applied to winches, automobile cranes and other various types of rope transmission mechanical equipment.

Background technique

In the lifting equipment, the motor drives a lifting device (drum), and the heavy object is hoisted or lowered through the rotation of the drum, while the hoisting steel rope is connected with the hoisted object through a guide wheel. Depending on the situation, it is necessary to ensure that the wire rope maintains a certain tension when retracting and unwinding, so as to prevent the wire rope from forming a messy rope on the hoisting drum.

The tension maintaining device in the traditional lifting equipment needs to make corresponding feedback on the change of the traction force of the driving drum through the cooperation of the circuit and the hydraulic system to ensure the constant tension of the wire rope. The structure of this tension maintaining device is too complicated. There are certain difficulties in design, troublesome maintenance in the later stage, and also greatly increase the cost of equipment use.

Contents of the invention

The technical problem solved by the present invention is to provide a new type of purely mechanical tension maintaining device, which has high feasibility and reliability, high control precision, and long lasting.

The present invention is realized by the following technical solutions: a tension maintaining device, comprising a first gear 2 and a second gear 6 fitted on the same gear shaft;

The first gear 2 is fixed on the gear shaft 11, and is connected with the gear transmission system of the wire rope guide wheel 14, and the two ends of the gear shaft 11 are equipped with rotating bearings 1;

The second gear 6 is sleeved on the gear shaft 11 through the one-way bearing 9, a bushing 5 is arranged between the second gear 6 and the one-way bearing 9, and the second gear 6 is connected with the gear transmission system of the motor 12 driving the drum ;

Static friction discs 10 are fixed on both sides of the second gear 6 . The static friction discs 10 are correspondingly pressed against a dynamic friction disc 7 , and the dynamic friction discs 7 are fixedly socketed with the outer ring of the one-way bearing 9 in the circumferential direction.

Further, the inner ring of the one-way bearing 9 is fixedly sleeved on the gear shaft 11, the outer ring is covered with a bearing sleeve 15, the second gear 6 is sleeved on the bearing sleeve 15 through the bushing 5, and the dynamic friction disc 7 Through the spline connection and the bearing sleeve 15, the circumferential fixed socket is realized.

Further, the dynamic friction disc 7 presses the static friction disc 10 from both sides of the second gear 6 through the disc spring assembly 8, the disc spring assembly 8 is set on the bearing sleeve 15, and one end is fixed on the bearing sleeve The upper retaining ring 4 is in contact, and the other end presses and squeezes the back of the dynamic friction disc to realize the preload between the dynamic friction disc and the static friction disc.

Further, the static friction disc 10 is fixedly embedded on both end surfaces of the second gear 6 .

In the present invention, the one-way bearing 9 is a one-way needle bearing.

In the present invention, the dynamic friction disc 7 and the static friction disc 10 use wet paper-based friction materials.

In the present invention, disc springs apply preload to the second gear 6 embedded with friction material to fix its circumferential degree of freedom, and then use the one-way locking function of the one-way needle bearing to realize torque transmission in one direction. When the input torque of the second gear 6 is greater than the maximum torque that can be generated by the preload of the dynamic and static friction discs, the static friction discs begin to slip relative to the dynamic friction discs. The maximum torque that can be generated by the load is equal, so as to realize the tension maintenance function.

The static friction disc is a paper-based friction material directly embedded in the output gear. The wet paper-based friction material used in this device has good friction and wear performance, so the device has good reliability and can guarantee a long life.

The present invention has following beneficial effects:

The present invention has a purely mechanical structure, ingenious design, and simple structure. The wet paper-based friction material used in the friction plate has very good friction and abrasion properties, can ensure long-term work, has high reliability, and can ensure relatively high Long life, the preload friction torque of the friction disc can be adjusted by adjusting the relative position of the parts and changing the parameters of the disc spring assembly, that is, the tension of the wire rope can be adjusted.

The present invention will be further described in detail below in conjunction with the accompanying drawings, but not limited to those shown in the accompanying drawings.

Description of drawings

Figure 1 is a schematic diagram of the assembly of the tension maintaining device.

Figure 2 is a schematic diagram of the mechanism of the tension maintaining device connected to the lifting device.

Fig. 3 is a working principle diagram of the tension maintaining device.

Symbols in the figure: 1-rotating bearing, 2-first gear, 3-gasket, 4-retaining ring, 5-bush, 6-second gear, 7-moving friction disc, 8-disc spring assembly, 9- One-way bearing, 10-static friction disc, 11-gear shaft, 12-motor, 13-roller, 14-wire rope guide wheel, 15-bearing sleeve.

Detailed ways

Example

Referring to FIG. 1 , the tension maintaining device includes a first gear 2 , a second gear 6 , a dynamic friction disc 7 , a one-way bearing 9 , a static friction disc 10 , and a gear shaft 11 .

The first gear 2 is fixed on a gear shaft 11, the first gear 2 and the gear shaft 11 can be connected by a key or integrally formed, the two ends of the gear shaft 11 are equipped with a rotating bearing 1, and the second gear 6 is sleeved by a one-way bearing 9 On the gear shaft 11, the inner ring of the one-way bearing 9 is fixedly sleeved on the gear shaft 11, the outer ring is covered with a bearing sleeve 15, the second gear 6 is sleeved on the bearing sleeve 15 through the bushing 5, and the two sides of the second gear 6 The static friction disc 10 is fixed on the side end surface, and the static friction disc 10 is fixedly embedded on the two side end surfaces of the second gear 6. The static friction disc 10 is correspondingly pressed against the dynamic friction disc 7, and the dynamic friction disc 7 is connected with the bearing sleeve 15 through a spline to realize Circumferential fixed socket.

Specifically, the dynamic friction disc 7 presses the static friction disc 10 from both sides of the second gear 6 through the disc spring assembly 8, the disc spring assembly 8 is set on the bearing sleeve 15, and one end is connected with the retaining ring fixed on the bearing sleeve. 4 contact, the other end presses the back of the dynamic friction disc, the disc spring assembly 8 is installed on the same shaft (bearing sleeve) as the dynamic and static friction discs, and a certain pressing force is applied to the dynamic and static friction discs by compressing the disc springs. A certain friction torque is maintained between the dynamic and static friction discs, and the preload between the dynamic and static friction discs is realized. A gasket 3 is provided between the retaining ring 4 of the second gear 6 and the first gear 2 .

When assembling, the present invention applies a certain load to the second gear 6 by adjusting the compression amount of the disc spring and pressing the dynamic and static friction discs. When the torque is high, the first gear 2 can be driven to transmit normally. When the torque transmitted by the second gear 6 is greater than the maximum friction torque that can be generated by the preload, the dynamic and static friction discs will start to slip, and the output torque of the first gear 2 will be constant. It is equal to the maximum friction torque generated by the preload of dynamic and static friction discs.

In a specific application, the one-way bearing 9 is a one-way needle bearing, which can further reduce the assembly structure.

In this embodiment, the dynamic friction disc 7 and the static friction disc 10 use wet paper-based friction materials. Due to the particularity of the friction materials, the friction materials should work in the working environment of lubricating oil.

After the above tension maintaining device is assembled, the working status is as follows:

Due to the existence of the one-way bearing, the second gear 6 can rotate freely in one direction (assumed to be counterclockwise) relative to the first gear 2, that is, when the first gear 2 does not rotate, because of the effect of the one-way bearing, the second gear 6 It can rotate freely counterclockwise, and no torque is transmitted at this time

When the second gear 6 rotates in another direction (clockwise) relative to the first gear 2, the first gear 2 applies torque in another direction (clockwise), and the second gear 6 overcomes the frictional moment between the dynamic and static friction discs , through the relative rotation of the bush 5 and the bearing sleeve 15, relative sliding occurs between the dynamic and static friction discs, and the friction torque between the dynamic and static friction discs overcome when the second gear 6 and the first gear 2 rotate relatively is the second gear 2 The tension moment transmitted, when the friction moment between the dynamic and static friction discs is constant, the tension is constant.

Referring to Fig. 2, the second gear 6 in Fig. 1 is connected with the gear transmission system of the motor 12 driving the drum 13; the first gear 2 is connected with the gear transmission system of the wire rope guide wheel 14;

Referring to Fig. 3, the first gear 2 cannot rotate clockwise due to the limitation of the one-way bearing, while the second gear 6 is connected with the one-way bearing through a sliding bush and can rotate in reverse, so when the second gear 6 is opposite When the first gear 2 rotates clockwise, the second gear 6 can rotate as long as it overcomes the friction torque between the dynamic and static friction discs. When the rotational torque exceeds the set frictional torque, relative rotation occurs between the second gear 6 and the first gear 2, the dynamic and static friction discs slide relative to each other, and the relative sliding torque is a certain value (set value M=X N.m) , The X value can be adjusted by the amount of compression of the disc spring assembly.

The motor 12 drives the drum 13, and the heavy object is hoisted or put down by the rotation of the drum 13, and the hoisting steel rope is connected with the suspended object through the wire rope guide wheel 14.

During the working process, the second gear 6 is connected with the gear on the shaft of the motor-driven drum 13, and the first gear 2 is meshed with the gear on the shaft of the wire rope guide wheel. tension.

When the second gear 6 rotates counterclockwise relative to the first gear 2 (consistent with the direction in which the one-way bearing can rotate), it can rotate freely. When the hoisting equipment lifts heavy objects, it is not necessary to consider the tension of the wire rope. ;

When the second gear 6 rotates clockwise relative to the first gear 2, the second gear 6 can rotate when the rotational torque is greater than the set friction torque (set value M=X N.m), and the dynamic and static frictions overcome by the second gear 6 The friction torque between the discs is the rotational torque output by the first gear 2, that is, the tension torque of the wire rope guide wheel 14. If the friction force between the dynamic and static friction discs is constant, the tension force generated by the wire rope guide wheel 14 on the wire rope is constant. , so that a certain tension can be maintained when the wire rope is retracted.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (6)

1. tension maintaining device, is characterized in that: comprise the first gear (2) and the second gear (6) that same gear wheel shaft is set with;

Described first gear (2) is fixed on gear wheel shaft (11), and is connected with the gear train assembly of steel rope guide wheel (14), and described gear wheel shaft (11) two ends are equipped with rolling bearing (1);

Described second gear (6) is set on gear wheel shaft (11) by unilateral bearing (9), be provided with lining (5) between second gear (6) and unilateral bearing (9), the second gear (6) is connected with the gear train assembly of electrical motor (12) head roll;

The both sides end face of described second gear (6) is installed with static friction dish (10), described static friction dish (10) correspondence compresses dynamic friction dish (7), and described dynamic friction dish (7) is fixedly sleeved with the outer ring circumference of unilateral bearing (9).

2. tension maintaining device according to claim 1, the inner ring of described unilateral bearing (9) is fixedly sleeved on gear wheel shaft (11), outer ring sleeve has bearing carrier ring (15), described second gear (6) is sleeved on bearing carrier ring (15) by lining (5), and it is fixedly sleeved that described dynamic friction dish (7) realizes circumference by spline joint and bearing carrier ring (15).

3. tension maintaining device according to claim 2, described dynamic friction dish (7) compresses static friction dish (10) by disk spring assembly (8) from the both sides end face of the second gear (6), described disk spring assembly (8) is sleeved on bearing carrier ring (15), one end contacts with the back-up ring be installed on bearing carrier ring (4), the other end compresses the extruding dynamic friction dish back side, realizes the prestrain between dynamic friction dish and static friction dish.

4. tension maintaining device according to claim 3, described static friction dish (10) is fixedly flush-mounted on the both sides end face of the second gear (6).

5. the tension maintaining device according to any one of claim 1-4, described unilateral bearing (9) is unidirectional needle bearing.

6. tension maintaining device according to claim 5, described dynamic friction dish (7) and static friction dish (10) adopt hygrometric state paper friction material.