CN106644459A - Sprocket fatigue test tester and test method - Google Patents

Abstract

The invention discloses a sprocket fatigue test device and test method. The test device includes a drive system and a brake system. The drive system includes an AC servo motor, the output shaft of the AC servo motor is connected to the input shaft of a planetary reducer, and the output The shaft is connected to one end of the drive shaft through a coupling, and the other end of the drive shaft is connected to the three-jaw chuck of the drive sprocket. The drive sprocket is fixed on the three-jaw chuck of the drive sprocket. There is a magnetic powder brake on the platform, the output shaft of the magnetic powder brake is connected to one end of the torque sensor through coupling two, the other end of the torque sensor is connected to one end of the brake shaft through coupling three, and the other end of the brake shaft is connected to the three-jaw chuck of the brake sprocket , the brake sprocket is fixed on the three-jaw chuck of the brake sprocket. The sprocket fatigue test device of the present invention can input a fixed alternating load for a specific working condition to reflect the real fatigue performance of the sprocket.

Description

A sprocket fatigue test device and test method

technical field

The invention belongs to the technical field of testing and testing, and in particular relates to a sprocket fatigue testing device and testing method.

Background technique

Chain transmission is an important transmission device in mechanical equipment. It is suitable for most heavy equipment due to its advantages such as no elastic sliding, accurate average transmission ratio, large transmission power, and strong overload capacity. However, the cost of the sprocket is high, it is easy to wear, and the transmission stability is poor. At the same time, additional dynamic loads, vibrations, and impacts will be generated during operation, which greatly reduces the life of the sprocket. Sprocket failure in heavy machinery can not only cause economic loss, but also cause safety problems. At present, the sprockets used in key components of heavy industries such as coal mines have high manufacturing costs due to their high material strength, good impact toughness, and corrosion resistance. If they are replaced as a whole due to partial damage, it will not only increase production costs, but also do not conform to "green manufacturing" the concept of. In recent years, with the establishment of the theory of additive manufacturing and the development of technology, most of the sprockets that have failed due to local damage have been repaired by laser cladding or surfacing and continue to be used. Fatigue performance evaluation, test method and test device of repaired sprocket.

At present, there are endless fatigue test devices at home and abroad, but they are mainly indirect test methods, and the fatigue performance of parts is evaluated by testing the fatigue performance of materials. This test method ignores the structural characteristics of the parts, and the reliability of the obtained data is low. It cannot reflect the stress state of the parts under actual working conditions, and the life evaluation is inaccurate.

Contents of the invention

Purpose of the invention: In order to reflect the fatigue characteristics of the sprocket more truly, the present invention provides a fatigue test device and test method for the sprocket. According to the service condition of the sprocket, the actual working condition of the sprocket is simulated to solve the problem of the existing fatigue test device. It cannot truly reflect the fatigue characteristics of the sprocket.

In order to achieve the above object, the present invention adopts the following technical solutions: a sprocket fatigue test device, including a drive system and a braking system, the drive system includes an AC servo motor, the output shaft of the AC servo motor is connected to the input shaft of the planetary reducer, The output shaft of the planetary reducer is connected to one end of the drive shaft through a coupling, and the other end of the drive shaft is connected to the three-jaw chuck of the drive sprocket. The drive sprocket is fixed on the three-jaw chuck of the drive sprocket. The braking system includes a one-dimensional motion platform The one-dimensional motion platform is equipped with a magnetic powder brake, the output shaft of the magnetic powder brake is connected to one end of the torque sensor through the coupling two, the other end of the torque sensor is connected to one end of the brake shaft through the coupling three, and the other end of the brake shaft is connected to the brake sprocket Three-jaw chuck, the brake sprocket is fixed on the three-jaw chuck of the brake sprocket.

Further, the drive sprocket three-jaw chuck includes a disc body, a disc wire is provided inside the disc body, a spiral groove is provided on one side of the coil wire, a tooth groove is provided on the other side of the coil wire, and a Bevel gear, the bevel gear and the tooth groove are meshed with each other. Three radial chute grooves are evenly distributed along the circumference on the end face of the disk body near the spiral groove. One end of the claw is embedded in the radial chute groove, and there are several arc grooves on the claw The arc-shaped notch and the spiral groove cooperate with each other, the other end of the jaw is provided with an axial positioning pressure block, the positioning bolt is matched with the hole thread on the axial positioning pressure block, and the end of the positioning bolt is provided with an arc-shaped rubber pad; The structure of the three-jaw chuck of the brake sprocket is the same as that of the drive sprocket three-jaw chuck.

Further, the one-dimensional motion platform includes a stepping motor, the output shaft of the stepping motor is connected to the screw through a coupling, the screw nut cooperates with the screw, the mobile platform is connected to the screw nut through bolts, and the two sides of the screw are symmetrical Two slide rails are distributed, and two slide blocks are installed on each slide rail, and the slide blocks are connected with the moving platform of the brake system through bolts.

Further, a bearing seat 1 is provided in the middle of the drive shaft and the brake shaft.

Further, the end of the screw is provided with a bearing seat 2.

The sprocket fatigue test test method according to the above-mentioned test device includes the following steps:

a) Fix the drive sprocket through the three-jaw chuck of the drive sprocket, and fix the brake sprocket through the three-jaw chuck of the brake sprocket;

b) Adjust the one-dimensional motion platform, install the chain on the drive sprocket and brake sprocket, and adjust the one-dimensional motion platform again to tension the chain.

c) Input the driving signal according to the actual working conditions, the AC servo motor drives the driving sprocket to rotate, the braking system is provided by the magnetic powder brake, the driving system and the braking system transmit torque through the chain, the torque sensor monitors and feeds back the torque information in real time, and the The output signal of the torque sensor is compared with the input signal and adjusted.

Beneficial effects: the present invention aims at the fatigue characteristics of the sprocket, and proposes a special fatigue test device for the sprocket, which is different from the previous indirect test fatigue characteristics. The phase-fixed alternating load reflects the real fatigue performance of the sprocket, and the three-jaw chuck can be adapted to sprockets of different diameters and thicknesses. At the same time, the one-dimensional motion platform can adjust the center distance of the sprocket. The above functions make it suitable for For various types of sprocket fatigue tests.

Description of drawings

Fig. 1 is the structural representation of sprocket fatigue test testing device of the present invention;

Figure 2 is an exploded view of the drive system;

Figure 3 is an exploded view of the braking system;

Figure 4 is an isometric view of the drive sprocket three-jaw chuck;

Fig. 5 is a sectional view of the drive sprocket three-jaw chuck;

Figure 6 is an isometric view of a one-dimensional motion platform;

Fig. 7 is the bottom view of one-dimensional motion platform;

In the figure: 1-test bench, 2-drive sprocket, 3-bearing seat 1, 4-coupling 1, 5-planetary reducer, 6-AC servo motor, 7-magnetic powder brake, 8-coupling 2 , 9-torque sensor, 10-coupling three, 11-one-dimensional motion platform, 1101-moving platform, 1102-slide rail, 1103-coupling four, 1104-stepping motor, 1105-screw, 1106-bearing Seat two, 1107-screw nut, 1108-slider, 12-drive sprocket three-jaw chuck, 1201-axial positioning pressure block, 1202-locating bolt, 1203-arc rubber pad, 1204-claw, 1205 -disc body, 1206-disc wire, 1207-bevel gear, 1208-spiral groove, 1209-tooth groove, 1210-arc notch, 13-brake sprocket, 14-brake sprocket three-jaw chuck.

detailed description:

The present invention will be further explained below in conjunction with the accompanying drawings.

As shown in FIGS. 1 to 3 , a sprocket fatigue test device of the present invention includes a driving system and a braking system installed on a test bench 1 . The drive system includes an AC servo motor 6, the output shaft of the AC servo motor 6 is connected to the input shaft of the planetary reducer 5, the output shaft of the planetary reducer 5 is connected to one end of the drive shaft through a coupling 4, and the middle part of the drive shaft is provided with a bearing seat 3 to drive The other end of the shaft is connected to the drive sprocket three-jaw chuck 12, and the drive sprocket 2 is fixed on the drive sprocket three-jaw chuck 12. The braking system includes a one-dimensional motion platform 11, on which a magnetic powder brake 7 is arranged, and the output shaft of the magnetic powder brake 7 is connected to one end of the torque sensor 9 through a coupling two 8, and the other end of the torque sensor 9 is through a coupling three 10 Connect one end of the brake shaft, the middle part of the brake shaft is provided with a bearing seat 3, the other end of the brake shaft is connected to the three-jaw chuck 14 of the brake sprocket, and the brake sprocket 13 is fixed on the three-jaw chuck 14 of the brake sprocket .

As shown in Figures 4 and 5, the drive sprocket three-jaw chuck 12 includes a disc body 1205, a coil wire 1206 is arranged inside the disc body 1205, a spiral groove 1208 is provided on one side of the coil wire 1206, and a spiral groove 1208 is provided on the other side of the coil wire 1206. A tooth groove 1209 is provided, and a bevel gear 1207 is arranged on the circumference of the disk body 1205. The bevel gear 1207 and the tooth groove 1209 mesh with each other, and three radial slide grooves are evenly distributed along the circumference on the end surface of the disk body 1205 close to the spiral groove 1208. One end of the claw 1204 is embedded in the radial chute. The claw 1204 is provided with a number of arc-shaped notches 1210. The arc-shaped notch 1210 cooperates with the spiral groove 1208. The other end of the claw 1204 is provided with an axial positioning pressure block 1201. The positioning bolt 1202 is threadedly matched with the hole on the axial positioning pressure block 1201 , and the end of the positioning bolt 1202 is provided with an arc-shaped rubber pad 1203 . The brake sprocket three-jaw chuck 14 has the same structure as the driving sprocket three-jaw chuck 12 .

As shown in Figures 6 and 7, the one-dimensional motion platform 11 includes a stepping motor 1104, the output shaft of the stepping motor 1104 is connected to the screw 1105 through a coupling 4 1103, and the end of the screw 1105 is provided with a bearing seat 2 1106 . The lead screw nut 1107 cooperates with the screw rod 1105, the mobile platform 1101 is connected with the lead screw nut 1107 by bolts, two slide rails 1102 are symmetrically distributed on both sides of the screw rod 1105, and two slide blocks 1108 are installed on each slide rail 1102, and the slide block 1108 It is connected with the brake system mobile platform 1101 by bolts.

The sprocket fatigue test device is different from the previous indirect fatigue test method. This sprocket fatigue test device can input a specific alternating load for a certain working condition to reflect the real fatigue performance of the sprocket, and The three-jaw chuck of this fatigue test device can be adapted to sprockets of different diameters and thicknesses. At the same time, the one-dimensional motion platform can adjust the center distance of sprockets. The above functions make it suitable for fatigue tests of various types of sprockets.

The sprocket fatigue test test method according to the above-mentioned test device includes the following steps:

a) Fix the drive sprocket 2 by the three-jaw chuck 12 of the drive sprocket, and fix the brake sprocket 13 by the three-jaw chuck 14 of the brake sprocket;

b) Adjust the one-dimensional motion platform 11, install the chain on the drive sprocket 2 and the brake sprocket 13, and adjust the one-dimensional motion platform 11 again to tension the chain.

c) Input the driving signal according to the actual working conditions, the AC servo motor 6 drives the driving sprocket to rotate, the braking system is provided by the magnetic powder brake 7, the driving system and the braking system transmit torque through the chain, and the torque sensor 9 monitors and feeds back the torque in real time Information, compare the output signal of the torque sensor with the input signal, and adjust.

In step a), by manually rotating the bevel gear 1207, the bevel gear 1207 drives the coil wire 1206 to rotate, and the coil wire 1206 drives the claw 1204 to slide along the radial chute, so that the claw supports the inner ring of the drive sprocket 2 . Axial positioning pressing blocks 1201 are respectively fixed on the three claws 1204, and the positioning bolts 1202 on the axial positioning pressing blocks 1201 are tightened so that the arc-shaped rubber pad 1203 is pressed against the driving sprocket 2, which is used for driving the sprocket 2 Axial positioning. The fixing method of the brake sprocket 13 is the same as that of the drive sprocket 2 .

In step b), the stepper motor 1104 is driven to drive the screw 1105 to rotate so that the screw nut 1107 translates left and right to realize the left and right adjustment of the braking system mobile platform 1101, and the two sliders 1108 move along the slide rail 1102 with the mobile platform 1101 to Reduce the frictional resistance when moving left and right, and reduce the load of the stepping motor 1104. When installing the chain, the installation process can be simplified by driving the one-dimensional motion platform 11, and the installation efficiency can be improved. At the same time, when the chain reaches a certain load, it will relax, and the chain is prone to loosening. The stepping motor 1104 can be driven to adjust the center distance of the sprocket, so as to realize the tension of the chain, so that the test can be carried out normally.

In step c), during the test, the sprocket drive system is driven by the AC servo motor 6, and after decelerating through the planetary reducer 5, the torque is transmitted to the three claws of the drive sprocket through the coupling-4 The chuck 12 finally drives the driving sprocket 2 to rotate. In the braking system described above, the alternating load signal under a certain working condition is input to the control terminal of the magnetic powder brake 7, so that the magnetic powder brake 7 outputs an alternating load, and the magnetic powder brake 7 and the brake sprocket three-jaw chuck 14 There is a torque sensor 9 between them. The torque sensor 9 monitors and feeds back torque information in real time. The control end calibrates the output load of the magnetic powder brake 7 in real time by comparing the input signal of the magnetic powder brake 7 with the feedback information of the torque sensor 9, and finally transmits the torque to the control system. On the moving sprocket 13, ensure that the sprocket is subjected to the same alternating load as the actual working condition.

The above is only a preferred embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the present invention. It should be regarded as the protection scope of the present invention.

Claims (6)

1. a kind of sprocket wheel fatigue test test device, it is characterised in that：Including drive system and brakes, drive system includes AC servo motor (6), AC servo motor (6) output shaft connection planetary reduction gear (5) input shaft, planetary reduction gear (5) is defeated Shaft connects drive shaft one end, drive shaft other end connection drive sprocket scroll chuck (12), drive chain by shaft coupling one (4) Wheel (2) is fixed on drive sprocket scroll chuck (12), and brakes includes motion in one dimension platform (11), motion in one dimension platform (11) magnetic powder brake (7) is provided with, magnetic powder brake (7) output shaft connects torque sensor (9) by shaft coupling two (8) End, torque sensor (9) other end connects brake axle one end, brake axle other end connection braking sprocket wheel by shaft coupling three (10) Scroll chuck (14), braking sprocket wheel (13) is fixed in braking sprocket wheel scroll chuck (14).

2. a kind of sprocket wheel fatigue test test device according to claim 1, it is characterised in that：The drive sprocket three-jaw Chuck (12) includes disk body (1205), and inside disk body (1205) parcel (1206) is provided with, and parcel (1206) side is provided with helicla flute (1208), parcel (1206) opposite side is provided with teeth groove (1209), and conical gear (1207) is provided with disk body (1205) circumference, circle Bevel gear (1207) is intermeshed with teeth groove (1209), circumferentially equal near the side end face of helicla flute (1208) in disk body (1205) Three radial grooves of cloth, in the embedded radial groove in claw (1204) one end, claw (1204) is provided with some arc-shaped slots (1210), arc-shaped slot (1210) cooperates with helicla flute (1208), and claw (1204) other end is provided with axially position briquetting (1201), bolt (1202) coordinates with the hole screw thread on axially position briquetting (1201), and bolt (1202) end sets There is arc rubber blanket (1203)；Braking sprocket wheel scroll chuck (14) is identical with drive sprocket scroll chuck (12) structure.

3. a kind of sprocket wheel fatigue test test device according to claim 1 and 2, it is characterised in that：The motion in one dimension Platform (11) includes stepper motor (1104), and stepper motor (1104) output shaft is with screw rod (1105) by shaft coupling four (1103) It is connected, feed screw nut (1107) coordinates with screw rod (1105), mobile platform (1101) is connected by bolt and feed screw nut (1107) Connect, symmetrical two slide rails (1102) in both sides of screw rod (1105), two slide blocks (1108) be installed on each slide rail (1102), Slide block (1108) is connected by bolt with brakes mobile platform (1101).

4. a kind of sprocket wheel fatigue test test device according to claim 3, it is characterised in that：The drive shaft, braking Axle middle part is provided with bearing block one (3).

5. a kind of sprocket wheel fatigue test test device according to claim 3, it is characterised in that：Screw rod (1105) end Portion is provided with bearing block two (1106).

6. according to right 3 test device sprocket wheel fatigue test method of testing, it is characterised in that：Comprise the following steps：

A) by drive sprocket scroll chuck (12) fixed drive sprocket wheel (2), by braking the fixed system of sprocket wheel scroll chuck (14) Movable sprocket (13)；

B) motion in one dimension platform (11) is adjusted, chain is arranged on drive sprocket (2) and braking sprocket wheel (13), one is adjusted again Maintenance and operation moving platform (11) carries out chain tension.

C) according to actual condition input drive signal, AC servo motor (6) drives drive sprocket to rotate, and brakes is by magnetic Brake (7) provides load, and drive system and brakes transmit torque by chain, and torque sensor (9) real-time monitoring is simultaneously Feedback torque information, torque sensor output signal and input signal are contrasted, adjustment.