CN204657105U - Vertical miller spindle lift structure - Google Patents

Abstract

The utility model relates to the field of continuous hot rolling, and discloses a lifting structure for connecting shafts of vertical rolling mills. It includes a lifting drive mechanism, a spline sleeve, a spline sleeve top cover, a tapered roller bearing and a fixed-length universal joint shaft. The universal joint shaft is connected to the bottom of the spline sleeve, and the spline sleeve top cover is connected to On the top of the spline sleeve, the tapered roller bearing is located in the spline sleeve and its upper part is connected to the top cover of the spline sleeve. The lifting drive mechanism is installed above the rolling mill reducer through a support frame, which can accommodate The cavity of the spline sleeve, the lower end of the lifting drive mechanism passes through the top cover of the spline sleeve and is inserted into the tapered roller bearing, and the lower part of the tapered roller bearing is connected with the lower end of the lifting drive mechanism through the bearing sleeve. The spline sleeve and the gear spline groove of the rolling mill reducer slide and cooperate to form a moving pair. The lifting structure is not only convenient for changing rollers and shafts, but also solves the problem of short service life of traditional telescopic universal joint shafts.

Description

Lifting structure of vertical roll mill connecting shaft

technical field

The utility model relates to the field of continuous hot rolling, in particular to a lifting structure for connecting shafts of vertical rolling mills.

Background technique

Traditionally, the shaft lifting structure of the vertical roll mill is installed in the middle of the rolling mill. This area is usually used to replace the work roll and the shaft. When replacing, the shaft needs to be lifted and disengaged from the work roll. Due to the compact layout of the frame space, the process of changing rolls and lifting the connecting shaft requires skilled workers to lift the telescopic connecting shaft to the highest position and lock it with bolts with the workshop hoisting crane and special spreader, and then the work roll can be replaced , The lowering of the connecting shaft needs to perform the opposite procedure. The whole process takes a long time and has a low degree of automation, which affects the production efficiency of the rolling mill. The traditional structure adopts the splined telescopic universal joint shaft, which has high cost, and due to the limited structural space and harsh use environment, the spline pair of the shaft wears quickly, the service life of the shaft is short, and the economy is poor.

Utility model content

The technical problem to be solved by the utility model is to provide a vertical rolling mill shaft lifting structure adopting a fixed-length universal joint shaft. The problem of short service life.

The shaft lifting structure of the vertical rolling mill disclosed by the utility model includes a lifting drive mechanism, a spline sleeve, a top cover of the spline sleeve, a tapered roller bearing and a fixed-length universal joint shaft, the universal joint shaft is connected to The bottom of the spline sleeve, the top cover of the spline sleeve is connected to the top of the spline sleeve, the tapered roller bearing is located in the spline sleeve and its upper part is connected with the top cover of the spline sleeve, and the lifting drive mechanism is installed through a support frame Above the reducer of the rolling mill, the support frame has a cavity that can accommodate the spline sleeve. The lower end of the lifting drive mechanism passes through the top cover of the spline sleeve and is inserted into the tapered roller bearing. The lower part of the tapered roller bearing The bearing sleeve is connected with the lower end of the lifting drive mechanism, and the spline sleeve is slidably matched with the gear spline groove of the rolling mill reducer to form a moving pair.

Preferably, a bearing sleeve is arranged in the spline sleeve, the tapered roller bearing and the bearing sleeve are both located in the bearing sleeve, and the bearing sleeve is connected with the top cover of the spline sleeve and the spline sleeve as a whole.

Preferably, the spline sleeve top cover includes a bearing upper cover and a gland, the bearing upper cover is installed on the bearing outer shell, and the gland is installed on the spline sleeve.

Preferably, the lower end of the lifting drive mechanism is provided with a lock nut for locking the bearing sleeve, the lower part of the bearing sleeve is provided with an inner guide ring, and the tapered roller bearing, the inner guide ring and the bearing sleeve are in interference connection, An outer guide ring is installed at a position corresponding to the inner guide ring inside the bearing outer shell, and there is a gap between the inner guide ring and the outer guide ring.

Preferably, a mounting frame is provided above the support frame, the lifting drive mechanism is a hydraulic cylinder, the top end of the hydraulic cylinder is connected to the mounting frame, and the piston rod of the hydraulic cylinder is connected to the bearing sleeve through the top cover of the spline sleeve.

Preferably, a protective cover is arranged outside the lifting drive mechanism.

Preferably, a coupling cover is connected to the lower part of the spline sleeve, and a matching semi-sealed cover is provided at a corresponding position on the bottom of the rolling mill reducer.

Preferably, the outer periphery of the spline sleeve top cover has a flange, and the upper part of the support frame is provided with a safety pin corresponding to the flange.

Preferably, an upper limit travel switch is installed on the upper part of the support frame, and a lower limit travel switch is installed on the lower part of the support frame.

Preferably, a working position travel switch and an angle travel switch are installed in the middle of the support frame.

The beneficial effects of the utility model are:

1. The fixed-length universal joint shaft is adopted, and the shaft does not need spline pair to expand and contract. The influence of the use environment on the performance of the joint shaft is reduced, and the product price and maintenance cost are reduced. Since the spline pair is in the gearbox, the connecting shaft structure is no longer limited, and a larger slewing diameter can be adopted, the force transmission performance is significantly increased, the service life is extended, and the product's economy is greatly improved.

2. The new structure layout is in the middle of the upper part of the reducer, which expands the space in the middle of the rolling mill. The lifting and lowering of the shaft does not require the participation of the workshop hoisting crane and special spreader. rolling efficiency.

3. Since the weight of the connecting shaft is borne by the lifting hydraulic cylinder, the axial force of the work roll is reduced, the force of the vertical roller bearing is improved, and the bearing life is increased.

Description of drawings

Fig. 1 is the schematic diagram of vertical rolling mill;

Fig. 2 is the schematic diagram of the lifting structure of the shaft connection of the vertical roller mill in the prior art;

Fig. 3 is a schematic diagram of the lifting structure of the shaft of the vertical roller mill of the present invention;

Fig. 4 is the sectional view of A direction of Fig. 3;

Fig. 5 is an enlarged view of place I in Fig. 4;

FIG. 6 is a side view of FIG. 2 .

Reference signs: 1-spline sleeve, 2-bearing outer shell, 3-lock nut, 4-bearing sleeve, 5-bearing upper cover, 6-lifting drive mechanism, 7-protective cover, 8-gland, 9- Outer guide ring, 10-inner guide ring, 11-tapered roller bearing, 12-safety pin, 13-installation frame, 14-universal joint shaft, 15-semi-sealed cover, 16-connection cover, 17-support frame, 18-upper limit travel switch, 19-lower limit travel switch, 20-working position travel switch, 21-angle travel switch, 22-cavity, 23-spline groove, 24-flange.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Fig. 3 and Fig. 4, the shaft lifting structure of the vertical rolling mill disclosed by the utility model includes a lifting drive mechanism 6, a spline sleeve 1, a spline sleeve top cover, a tapered roller bearing 11 and a fixed-length universal Connecting shaft 14, the universal joint shaft 14 is connected to the bottom of the spline sleeve 1, the top cover of the spline sleeve is connected to the top of the spline sleeve 1, and the tapered roller bearing 11 is located in the spline sleeve 1 and its upper part Connected with the top cover of the spline sleeve, the lifting drive mechanism 6 is installed above the rolling mill reducer through a support frame 17. The support frame 17 has a cavity 22 that can accommodate the spline sleeve 1, and the lower end of the lift drive mechanism 6 Through the top cover of the spline sleeve, it is inserted into the tapered roller bearing 11. The lower part of the tapered roller bearing 11 is connected to the lower end of the lifting drive mechanism 6 through the bearing sleeve 4. The spline sleeve 1 is connected to the gear spline of the rolling mill reducer. The keyway 23 is slidably matched to form a mobile pair.

Different from the traditional structure that uses a telescopic universal joint shaft, the joint shaft lifting structure forms a telescopic structure through the cooperation of the spline sleeve 1 and the gear spline groove 23 of the rolling mill reducer. The cavity formed in the support frame 17 is the spline sleeve 1 Provides room for improvement. The gear spline groove 23 of the rolling mill reducer cooperates with the spline sleeve 1 to drive the spline sleeve 1 to rotate, the lower part of the spline sleeve 1 is connected to the fixed-length universal joint shaft 14, and the lower end of the universal joint shaft 14 is connected to the vertical roll of the rolling mill, thereby driving the vertical roll. Roller turns. The lifting drive mechanism 6 provides the lifting driving force for the lifting of the connecting shaft, and it does not participate in the rotation. The tapered roller bearing 11 is arranged in the spline sleeve 1, so that the lifting driving mechanism 6 can provide the vertical driving force for the spline sleeve 1 at the same time. , can rotate relative to the spline sleeve 1. The tapered roller bearing 11 can not only bear radial load but also bear relatively large axial load.

When the vertical roll mill needs to change the roll and lift the connecting shaft, the motor and the inner gear of the reduction box stop rotating, the lifting drive mechanism 6 is lifted, and the lifting force is transmitted to the spline through the bearing sleeve 4, the tapered roller bearing 11 and the top cover of the spline sleeve. On the sleeve 1, the spline sleeve 1 slides in the spline groove 23 of the large gear of the reducer, and drives the universal joint shaft 14 to achieve final lifting. After the lifting is in place, the lifting drive mechanism 6 stops and locks the position, and the joint shaft needs to be lowered during the roll change. , the lower end of the lifting drive mechanism 6 descends, and the spline sleeve 1 and the universal joint shaft 14 can realize the joint shaft descending under the action of gravity.

If the tapered roller bearing 11 is directly arranged in the spline sleeve 1, a relatively large bearing is required, and it is an installation bearing, which requires higher processing requirements for the spline sleeve 1. In order to reduce the processing requirements and facilitate installation, as a preferred In this way, the spline sleeve 1 is provided with a bearing casing 2, the tapered roller bearing 11 and the bearing casing 4 are all located in the bearing casing 2, and the bearing casing 2 is connected with the spline casing top cover and the spline casing 1 as one.

Similarly, for ease of installation, as a preferred method, the spline sleeve top cover includes a bearing upper cover 5 and a gland 8, the bearing upper cover 5 is installed on the bearing outer shell 2, and the gland 8 is installed on the spline sleeve 1 on.

Generally speaking, when the rolling mill is working and during the lifting process of the lifting structure, the axial force of the lifting drive mechanism 6 can be transmitted well. The force is better transmitted downwards. In order to solve this problem, as a preferred method, the lower end of the lifting drive mechanism 6 is provided with a lock nut 3 for locking the bearing sleeve 4, and the lower part of the bearing sleeve 4 is provided with an inner guide. ring 10, the tapered roller bearing 11, the inner guide ring 10 are in interference connection with the bearing sleeve 4, and the outer guide ring 9 is installed in the position corresponding to the inner guide ring 10 in the bearing outer shell 2, and the inner guide ring 10 There is a gap with the outer guide ring 9.

The inner guide ring 10 is in interference connection with the bearing sleeve 4, and can bear torque, axial force or the combined load of the two, and has a high bearing capacity. In the case that the connecting shaft is lowered, there is a certain gap between the inner guide ring 10 and the outer guide ring 9, so that during the working process of the rolling mill, there will be no friction between the inner guide ring 10 and the outer guide ring 9, which will affect the rolling mill. Normal operation; during the descent of the lifting structure, the downward force of the lifting drive mechanism 6 can be well transmitted to the spline sleeve 1 through the interaction between the inner guide ring 10 and the outer guide ring 9, so that The connecting shaft is lowered; while the rolling mill is working normally and the lifting structure is rising, the lock nut 3 can lock the bearing sleeve 4 to ensure the stability and safety of the lifting force transmission.

There are many options for the lifting drive mechanism 6, as long as it can provide the axial lifting force for the spline sleeve 1, and as a preferred mode, a mounting frame 13 is arranged above the support frame 17, and the lifting drive mechanism 6 is a hydraulic cylinder , the top of the hydraulic cylinder is connected to the mounting frame 13, and the piston rod of the hydraulic cylinder passes through the top cover of the spline sleeve and is connected to the bearing sleeve 4.

In order to protect the lifting drive mechanism 6 , as a preferred manner, a protective cover 7 is arranged outside the lifting drive mechanism 6 .

Lubricating oil will be added to the spline sleeve 1, spline groove and other mechanisms to ensure the normal operation of the mechanism, and in order to prevent the leakage of lubricating oil, as a preferred method, the lower part of the spline sleeve 1 is connected with a coupling cover 16. A matching semi-sealed cover 15 is provided at the corresponding position on the bottom.

In order to enhance the safety of the lifting mechanism, as a preferred method, the outer periphery of the spline sleeve top cover has a flange 24 , and the upper part of the support frame 17 is provided with a safety pin 12 corresponding to the flange 24 . After the spline sleeve 1 is lifted in place, the safety pin 12 can be inserted, and redundant safety measures are taken to ensure the safety of the roller change.

In order to ensure accurate lifting in place, as a preferred method, an upper limit travel switch 18 is installed on the upper part of the support frame 17, which is used to control the connecting shaft to rise accurately in place, and a lower limit travel switch 19 is installed on the lower part of the support frame 17, which is used to control the connecting shaft to fall in place Precise, so controlled lifting motion is always within the proper range.

Likewise, as a preferred manner, a working position travel switch 20 and an angle travel switch 21 are installed in the middle of the support frame 7 . The working position travel switch 20 is used to control the connecting shaft to accurately stop at the correct working position. In roll changing, the vertical roll must be at the correct angle to replace it smoothly, and the angle travel switch 21 can control it to stop at the precise position.

Claims (10)

1. vertical miller spindle lift structure, it is characterized in that: comprise and promote driving mechanism (6), spline housing (1), spline housing top cover, the universal-joint spindle (14) of taper roll bearing (11) and regular length, described universal-joint spindle (14) is connected to spline housing (1) bottom, described spline housing top cover is connected to spline housing (1) top, described taper roll bearing (11) is positioned at spline housing (1) and its top is connected with spline housing top cover, described lifting driving mechanism (6) is installed on above rolling mill reduction gears by bracing frame (17), support frame as described above (17) has the cavity (22) that can hold spline housing (1), described lifting driving mechanism (6) bottom is set in taper roll bearing (11) through spline housing top cover, described taper roll bearing (11) bottom is connected with lifting driving mechanism (6) bottom by bearing holder (housing, cover) (4), described spline housing (1) and rolling mill reduction gears gear spline groove (23) are slidably matched composition moving sets.

2. vertical miller spindle lift structure as claimed in claim 1, it is characterized in that: in described spline housing (1), be provided with bearing outside (2), described taper roll bearing (11), bearing holder (housing, cover) (4) are all arranged in bearing outside (2), and described bearing outside (2) connects as one with spline housing top cover and spline housing (1).

3. vertical miller spindle lift structure as claimed in claim 2, it is characterized in that: described spline housing top cover comprises bearing upper cover (5) and gland (8), described bearing upper cover (5) is installed on bearing outside (2), and described gland (8) is installed on spline housing (1).

4. vertical miller spindle lift structure as claimed in claim 2, it is characterized in that: described lifting driving mechanism (6) bottom is provided with the locking nut (3) for lock shaft bearing sleeve (4), described bearing holder (housing, cover) (4) bottom is provided with inner pivot ring (10), described taper roll bearing (11), inner pivot ring (10) is connected with bearing holder (housing, cover) (4) interference, position corresponding with inner pivot ring (10) in bearing outside (2) is provided with outer lead ring (9), between described inner pivot ring (10) and outer lead ring (9), there is gap.

5. vertical miller spindle lift structure as claimed in claim 1, it is characterized in that: support frame as described above (17) top is provided with installing rack (13), described lifting driving mechanism (6) is hydraulic cylinder, described hydraulic cylinder top is connected on installing rack (13), and hydraulic cylinder piston rod is connected with bearing holder (housing, cover) (4) through spline housing top cover.

6. vertical miller spindle lift structure as claimed in claim 5, is characterized in that: described lifting driving mechanism (6) is outside equipped with protective cover (7).

7. vertical miller spindle lift structure as claimed in claim 1, it is characterized in that: described spline housing (1) bottom is connected with connecting cap (16), correspondence position is provided with suitable semitight cover (15) bottom rolling mill reduction gears.

8. vertical miller spindle lift structure as claimed in claim 1, it is characterized in that: described spline housing top cover periphery has flange (24), support frame as described above (17) top is provided with the safety pin (12) corresponding with described flange (24).

9. vertical miller spindle lift structure as claimed in claim 1, it is characterized in that: support frame as described above (17) top is provided with upper limit travel switch (18), bracing frame (17) bottom is provided with lower bound range switch (19).

10. vertical miller spindle lift structure as claimed in claim 9, is characterized in that: support frame as described above (7) middle part is provided with working position travel switch (20) and angular travel switch (21).