CN216937689U - Rotary supporting device for mandrel chuck shaft on seamless steel pipe cold rolling mill - Google Patents

Abstract

The utility model discloses a rotary supporting device for a mandrel chuck shaft on a seamless steel tube cold rolling mill, which comprises a guide sleeve, a supporting seat and a roller; the guide sleeve is connected and fixed on the tail end face of the mandrel chuck main shaft; the two supporting seats are connected and fixed on the plane of a feeding rotary gear box body at the tail part of the mandrel chuck main shaft and are symmetrically positioned at two sides of the guide sleeve; the two idler wheels are respectively arranged on the corresponding supporting seats. According to the utility model, the axial bearing force is realized to counteract the axial movement by optimizing the positioning component, so that the running quality of the two-roller periodic seamless steel tube cold rolling mill is improved, and the technical requirements of high-grade seamless steel tube cold rolling tube production are met.

Description

Rotary supporting device for mandrel chuck shaft on seamless steel pipe cold rolling mill

Technical Field

The utility model relates to cold rolling production equipment for producing seamless steel tubes in the metallurgical and mechanical industries, in particular to a rotary supporting device for a mandrel chuck shaft on a seamless steel tube cold rolling mill.

Background

Seamless steel pipes are common metallurgical metal products. The seamless steel pipe cold rolling technology is a main mode for producing, preparing and processing seamless steel pipes at present due to the characteristics of high rolling precision, high speed, high productivity, high yield, easy production organization and process technology adjustment and the like.

The seamless steel tube cold rolling production equipment is divided into two-roller type and multi-roller type according to the number of rollers, wherein the two-roller periodic cold rolling tube is used for carrying out normal-temperature cold deformation processing on a blank tube through a deformation tool consisting of a top head (together with a core rod) and a hole pattern, and the seamless steel tube cold rolling mill is the most widely applied seamless steel tube cold rolling mill due to the characteristics of compact structure, large rolling force, high yield and the like.

The two-roller periodic cold pilger mill is a commonly used seamless steel pipe cold rolling device at present, and mainly comprises a feeding swing mechanism, a rolling mechanism, a transmission mechanism, a mandrel swing mechanism, a lathe bed supporting mechanism, a feeding and blanking mechanism, a hydraulic system, a process lubricating system, an electric automatic control system, a pneumatic system, an auxiliary mechanism and the like. Referring to fig. 1, the feeding and turning mechanism comprises a mandrel chuck device 1, a mandrel fine-tuning device 2, corner input and output devices 3 and 4, a feeding and turning cam device, a worm gear (worm) rod pair, a feeding swing rod device, a box body, a hydraulic pressure 5, a lubricating system and the like, is installed in a feeding and turning gear box body 6 in a set, and has the using function of decomposing power output by a main motor into horizontal feeding motion and synchronous rotating motion in seamless steel tube rolling, outputting the synchronous motion of feeding (horizontal displacement) and turning (radial rotation) required by rolling deformation of the seamless steel tube, and outputting corresponding vector kinetic energy after decelerating and changing the direction.

Referring to fig. 2, the mandrel chucking device 1 mainly comprises a main shaft 101, a rotary sleeve 102, a chuck 103, a positioning seat 104, and the like, has a total length of about 2m, and is of a slender structure, wherein the main shaft 101 is a slender hollow shaft, the chuck 103 comprises elements such as a guide cylinder, a support guide sleeve, a rolling bearing, a spacing ring, an end cap, a jaw body, a shift fork swing rod, and the like, the rotary sleeve 102 comprises elements such as a cylinder body, a rolling bearing, a gear, a spacing ring, a support ring, and the like, and the positioning seat 104 comprises elements such as a gear, a rolling bearing, a sliding seat, and the like; the chuck 103, the rotating sleeve 102 and the positioning seat 104 are sequentially and directionally installed on the main shaft 101, a shifting fork swing rod on the outer side of the chuck 103 is connected with a hydraulic cylinder, and the chuck 103 is driven to horizontally reciprocate on the main shaft 101 through the horizontal reciprocating motion of a piston rod of the hydraulic cylinder, so that the opening and closing functions of a mandrel jaw body are realized. Wherein, the open state of the jaw body provides a channel for the core rod and the seamless steel tube (tube blank) coated on the outer circumferential surface of the core rod to enter the middle lathe bed, and the closing of the jaw body locks the core rod, thereby preventing the core rod from escaping in the horizontal direction and driving the core rod to rotate. The guide sleeve 7 is composed of a sleeve, a snap ring, a housing and an inner hexagonal screw, the split snap ring is embedded into an annular groove at the tail part of the main shaft, and the sleeve, the housing and the like are connected and fixed on the end surface of the tail part of the main shaft 101 through the screw so as to play a role in horizontally guiding a pipe blank to be rolled and a core rod.

In the production practice, the cold rolling deformation processing movement process of the seamless steel tube mainly comprises the horizontal movement and the rotary movement of a tube blank (blank tube), in the cold rolling deformation processing, the horizontal movement is a main movement, the rotary movement is an auxiliary movement, both the horizontal movement and the rotary movement are intermittent movements, and the work machine frame is started and stopped simultaneously when located at the foremost station and the last station in the machine base. Wherein: the horizontal motion is intermittent linear motion, a feeding rotary mechanism outputs power through a three-wire lead screw to drive a feeding chuck to move forwards (in the direction of a rolling mechanism) to push a pipe blank, and the whole branch pipe blank is rolled from head to tail. The rotary motion is intermittent synchronous rotary motion, on one hand, the feed rotary mechanism transmits rotary power to the mandrel rotary mechanism, and the tube blank does intermittent rotary motion according to set parameters through clamping force of the front and rear chucks on the tube blank; on the other hand, the mandrel and the top head arranged at the foremost end of the mandrel are locked and driven to do synchronous rotary motion by feeding the mandrel chuck device in the rotary gearbox body, the function of the synchronous rotary motion is to ensure the roundness (coaxiality) in the rolling deformation processing of the seamless steel tube, and the number (numerical value) of the rotary motion is the rotary amount of the tube blank rolling. Therefore, according to the working condition structure and function of the feeding and rotating mechanism, the mandrel chuck device mainly plays roles of locking (locking) and synchronous rotation of the mandrel, and is also the only device in the feeding and rotating mechanism which directly participates in rolling deformation by taking the mandrel (plug) as a carrier, and the operation stability of the device not only affects the output precision of the feeding and rotating mechanism, but also directly affects the operation state of the rolling mechanism.

For a mandrel chucking device, the stability of the operation of the chuck is a difficulty which affects the entire mandrel chucking device. The inner part of the chuck is provided with three groups of jaw bodies, supporting sleeves and the like in an equal division mode, elements such as rolling bearings, shifting fork oscillating bars and the like are arranged on the outer side of the chuck, horizontal reciprocating motion is achieved under the driving of a hydraulic cylinder, synchronous rotation is achieved under the driving of a rotating sleeve, and the locking and driving functions of the core rod are achieved through the three groups of jaw bodies. Thus, in production practice, the chuck is the primary failure point for the mandrel chuck assembly, with the chuck guide barrel upset being the most problematic equipment failure in the field. The so-called sticking up of the chuck guide cylinder means that the horizontal displacement of the guide cylinder on the main shaft is abnormal, and the hydraulic cylinder cannot drive the guide cylinder to move horizontally. The main reason is that the guide cylinder has a heavy weight (150kg), various elements are assembled inside and outside, the total weight exceeds 300kg, and the chuck guide cylinder needs to horizontally displace on the main shaft twice when each pipe blank is rolled. And the clearance fit tolerance of the guide cylinder and the main shaft is controlled between 0.05-0.08 mm, once the guide cylinder is worn, the forward tilting phenomenon is generated due to the unbalance of the weight structure, the end part of the guide cylinder is just like a shovel (scraping) knife scraping the outer circumferential surface of the main shaft to generate rib-shaped burrs, and finally the rising and incrustation faults of the chuck guide cylinder on the main shaft are caused, and although the use precision of the faults can be recovered by replacing parts such as a chuck, the rising and incrustation faults can still occur repeatedly after the faults are used for a period of time. The failure disposal needs to open a feeding rotary gear box body, replace wear failure parts such as clamping heads and the like, and has long labor-consuming, time-consuming and shutdown time (the general shutdown time needs three working days).

The utility model discloses a chinese patent number ZL 202022201915.2's utility model a mandrel chuck device for seamless steel pipe cold rolling mill feeds rotation mechanism's through optimizing mandrel chuck supporting mechanism, has solved the stagnant and rising and has inlayed the hidden danger from the source. However, because the mandrel chuck device is always in a state of locking and driving the mandrel to synchronously rotate along with horizontal movement, according to the Newton's third motion law, the counter-acting force generated by the rolling mechanism on the acting force of the seamless steel tube in rolling is horizontally transmitted to the mandrel chuck device along the length direction of the mandrel and is sequentially transmitted to the chuck head and the main shaft through the jaw body of the locking mandrel, so that the main shaft horizontally moves towards the rear end. At this time, a phenomenon occurs in which: the mandrel chuck device moves towards the front end firstly and then moves towards the rear end, the moving distance (moving) is the accumulated value of each movement gap of the mandrel chuck device, and the seamless steel tube with high deformation resistance strength and large deformation specification exists all the time along with the rolling operation of the seamless steel tube in the state, the larger the reaction force is, the reciprocating movement (moving) of the mandrel and the rolled tube blank in the annular hole shape is caused, and the rolling quality and the service life of the top head are influenced. Meanwhile, the structure of a guide cylinder at the tail part of the mandrel is complex, the daily use and maintenance are inconvenient, and the conventional structure cannot provide a compensation supporting function for the axial movement of the mandrel chuck, so that the conventional mandrel chuck device needs to be structurally optimized, the hidden danger of equipment failure caused by the reaction force during rolling is reduced by an axial supporting compensation mode, and the construction of the functional precision of the equipment is promoted.

In summary, the mandrel chuck device for the two-roll periodical seamless steel tube cold rolling mill has the problems that the repeated axial movement (play) of the mandrel chuck device always exists due to the acting force and the reacting force during rolling, and the movement clearance increases synchronously along with the increase of the wear of the mandrel chuck, so that the hidden troubles of equipment failure and rolling quality deviation are caused.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a rotary supporting device for a mandrel chuck shaft on a seamless steel tube cold rolling mill, which can realize that the axial supporting force offsets the axial movement by optimizing a positioning component, thereby improving the running quality of a two-roller periodic seamless steel tube cold rolling mill and meeting the technical requirements of high-grade seamless steel tube cold rolled tube production.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a rotary supporting device for a mandrel chuck shaft on a seamless steel tube cold rolling mill comprises a guide sleeve, a supporting seat and a roller;

the guide sleeve is connected and fixed on the tail end face of the mandrel chuck main shaft;

the two supporting seats are connected and fixed on the plane of a feeding rotary gear box body at the tail part of the mandrel chuck main shaft and are symmetrically positioned at two sides of the guide sleeve;

the two idler wheels are respectively arranged on the corresponding supporting seats.

Preferably, the guide sleeve is a concentric and reducing three-section step-shaped cylinder, wherein an inner hole of the cylinder is formed in the axis position of the cylinder in one outer section, and an inner hole of a cone is formed in the axis position of the cylinder in the other outer section;

the inner hole of the cylinder is communicated with the inner hole of the cone through a thread inner hole.

Preferably, the major diameter side of the internal threaded hole of the cone faces outwards, and the minor diameter side faces inwards;

the diameter of the minor diameter is consistent with the diameter of the thread inner hole.

Preferably, the supporting seat comprises a flat plate, an upright post and a rib plate;

the flat plate is horizontally arranged, the upright post is vertically arranged on the upper surface of the flat plate, and the rib plate is connected between the flat plate and the upright post.

Preferably, the flat plate is rectangular, and a cross-shaped rectangular groove for mounting the upright post and the rib plate is formed in the upper surface of the flat plate;

round holes are formed in the four corner positions of the flat plate.

Preferably, a semi-closed groove is formed in the inner side face of the upper portion of the upright post, the bottom of the groove is semicircular, and the circle center of the semicircle coincides with the vertical center line of the upright post.

Preferably, the rib plates are arranged to be right triangles, and the height of the rib plates is 1/3-2/5 of the height of the upright post.

Preferably, the roller comprises a pin shaft, a roller sleeve, a rolling bearing, a distance ring, a washer and a nut;

the pin shaft is arranged into a concentric and reducing step-shaped cylinder, one end of the pin shaft is matched with the groove on the upright post, and the other end of the pin shaft is matched with the inner diameter of the rolling bearing;

the roller sleeve is sleeved on the outer diameter of the rolling bearing;

the two rolling bearings are provided, and the distance ring is also sleeved on the other end of the pin shaft and is positioned between the two rolling bearings;

the two nuts are respectively arranged on the two end parts of the pin shaft;

the two washers are respectively arranged on the two end parts of the pin shaft and positioned on the inner side of the nut.

The rotary supporting device for the mandrel chuck shaft on the seamless steel pipe cold rolling mill provided by the utility model has the following beneficial effects:

1) the mandrel chuck device has the advantages that the design is reasonable, the structure is compact, the axial positioning effect is continuous and stable, the axial movement (play) problem of the mandrel chuck device is effectively solved, and the production requirement of precision rolling of high-grade seamless steel pipes is met;

2) the two sets of supporting seats are provided with semi-closed positioning grooves for mounting rollers according to the rotating direction of the mandrel chuck, and the closed edges of the positioning grooves are utilized to play a role in circumferential positioning, so that the mandrel chuck is labor-saving, time-saving, safe, reliable, practical and efficient;

3) the guide sleeve is installed by adopting a threaded structure, the daily use and maintenance are convenient, the thread turning direction is consistent with that of the mandrel chuck, and the anti-loosening and anti-escape functions are stable and reliable;

4) the combination of the rectangular groove on the flat plate end surface of the supporting seat, the upright post and the rib plate has good deformation resistance and vibration resistance, and meets the strength requirement after the mandrel chuck bears the transmission of the reaction force during rolling;

5) the roller converts the rotary motion of the mandrel chuck into the rotary motion of the roller, converts the axial thrust of the mandrel chuck into the friction force of the roller motion, reduces the influence of axial movement (play) on the supporting seat and the roller, and prolongs the service life of the supporting member;

6) the roller is composed of a built-in rolling bearing and a roller sleeve, and the roller sleeve is used as a quick-wear part and can be quickly replaced after being worn, so that the use function is recovered;

7) the split type structure is adopted, the layout is reasonable, the dynamic and static combination is realized, the original component structure is not damaged, the requirement of ordered production of a seamless steel pipe cold rolling production line is met, the production promoting effect of eliminating the accident and reducing the cost is achieved to a certain extent, and the functional precision construction is promoted;

8) the universal mandrel chuck device has strong universality, is improved for the mandrel chuck device in the feeding swing mechanism of the similar two-roller periodic seamless steel tube cold rolling mill at present, and has certain reference and application values.

Drawings

FIG. 1 is a schematic structural view of a feeding rotary box of a conventional seamless steel pipe cold rolling mill, wherein (a) is a front view, (b) is a side view, and (c) is a schematic view of the direction M in (a);

FIG. 2 is a schematic diagram of a prior art mandrel chucking apparatus (shafting);

FIG. 3 is a schematic front view of the rotary support apparatus of the present invention;

FIG. 4 is a side schematic view of the rotary support apparatus of the present invention;

FIG. 5 is a schematic top view of the rotary support apparatus of the present invention;

FIG. 6 is a schematic view showing the structure of a guide sleeve in the rotary support apparatus of the present invention;

FIG. 7 is a schematic structural view of a support base in the rotary support apparatus of the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a top view;

FIG. 8 is a schematic view of the structure of the plate of FIG. 7;

FIG. 9 is a schematic structural view of the columns and webs of FIG. 7, wherein (a) is a front view, (b) is a side view, and (c) is a top view;

FIG. 10 is a schematic view of the structure of the roller of the rotation support device of the present invention;

FIG. 11 is a schematic structural view of the pin of FIG. 10;

FIG. 12 is a schematic view of the roller sleeve of FIG. 10;

fig. 13 is a schematic view showing an operation state of the rotary support apparatus of the present invention.

Detailed Description

In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.

Referring to fig. 3 to 5, the rotary supporting device for the mandrel chuck shaft of the seamless steel tube cold rolling mill provided by the utility model adopts a split structure, and comprises a guide sleeve 8, a supporting seat 9 and a roller 10.

The guide sleeve 8 is connected and fixed to the tail end face of the mandrel chuck spindle 11 by a threaded structure.

The two supporting seats 9 are connected and fixed on the plane of the feeding rotary gear box body at the tail part of the mandrel chuck main shaft and are symmetrically positioned at two sides of the guide sleeve 8.

The rollers 10 also have two sets, each mounted on a respective support 9. The axial movement positioning effect on the mandrel chuck shaft is realized through the attaching effect of the rollers 10 at the two sides of the feeding rotary gear box body and the guide sleeve 8 at the tail end face of the mandrel chuck main shaft.

The mandrel chuck main shaft 11 is made of a Q-235A hot-rolled seamless steel pipe, triangular threads are machined on the end face of the tail part of the mandrel chuck main shaft, and the outer diameter and the length of the triangular threads are matched with those of a thread inner hole 803 of the guide sleeve 8.

Referring to fig. 6, the guiding sleeve 8 is made of Q-235A and is configured as a three-segment step-shaped cylinder with a concentric diameter, wherein an inner hole 801 of the cylinder is formed at the axial center of the cylinder at one outer segment, an inner hole 802 of the cone is formed at the axial center of the cylinder at the other outer segment, the inner hole 801 of the cylinder and the inner hole 802 of the cone are communicated through a threaded inner hole 803, the large diameter side of the inner hole 802 of the cone faces outward, the small diameter side faces inward, and the diameter of the small diameter is the same as the diameter of the threaded inner hole 803.

The outer diameter of the cylinder with the cylindrical inner hole 801 is the largest, the outer diameter of the cylinder with the conical inner hole 802 is the next largest, the outer diameter of the cylinder with the threaded inner hole 803 is the smallest, and all connecting sections on the outer side of the cylinder are chamfered.

As shown in fig. 7 to 9, the supporting base 9 includes a flat plate 901, a column 902, and a rib plate 903.

The flat plate 901 is horizontally arranged, the upright column 902 is vertically arranged on the upper surface of the flat plate 901, and the rib plate 903 is connected between the flat plate 901 and the upright column 902.

The flat plate 901 is rectangular and made of Q-235A, the upper surface of the flat plate is provided with a cross-shaped rectangular groove 904 for mounting the upright post 902 and the rib plate 903, and a round hole 905 for mounting on the plane of the feeding rotary gear box body, and the round hole 905 is provided with an inner hexagon screw 12.

Four corners of the flat plate 901 are all processed with 45-degree chamfers, a cross-shaped rectangular groove 904 is arranged in the middle of the flat plate 901, and the groove width of the rectangular groove 904 is matched with the widths of the upright posts 902 and the rib plates 903.

The upright post 902 is made of Q-235A, both sides of the top in the length direction are respectively processed with a 45-degree chamfer, the inner side surface (close to the chamfer position) at the upper part is provided with a semi-closed groove 906, the bottom of the groove 906 is arranged into a semi-circle, and the center of the semi-circle coincides with the vertical center line of the upright post 902.

The rib plate 903 is made of Q-235A and is arranged to be a right triangle, and the height of the rib plate is 1/3-2/5 of the height of the upright post 902.

As shown in fig. 10 to 12, the roller 10 includes a pin 1001, a roller bushing 1002, a rolling bearing 1003, a distance ring 1004, a washer 1005, and a nut 1006.

The pin 1001 is made of Q-235A and is configured as a concentric and reducing step-shaped cylinder, one end of which is provided with a triangular thread 1007 on the outer circumferential surface and a rectangular plane on the inner side and the like, the width of the pin is matched with the groove 906 for being mounted on the upright column 902, and the other end of which is provided with a triangular thread 1008 on the outer circumferential surface and is matched with the inner diameter of the rolling bearing 1003 for being mounted on the rolling bearing 1003.

The roller sleeve 1002 is made of Q-235A and is a concentric, reducing and semi-enclosed ring, the inner diameter 1009 of the ring is matched with the outer diameter of the rolling bearing 1003 and is sleeved on the outer diameter of the rolling bearing 1003, a circular through hole 1010 is machined in the center of the enclosed end face of the ring, and the diameter of the circular through hole 1010 is matched with the diameter of the other end of the pin shaft 1001.

The rolling bearing 1003 has two, each 6205, deep groove bearings; the distance ring 1004 is made of Q-235A, is a concentric and reducing ring, and is also sleeved on the other end of the pin 1001 and located between the two rolling bearings 1003.

The nuts 1006 are M24 hexagonal nuts, and are respectively provided on the triangular threads 1007 and 1008 on both ends of the pin 1001.

The two washers 1005 are provided on both ends of the pin 1001 and inside the nut 1006, and are each a phi 24 spring washer and/or a phi 24 flat washer.

When the rotary supporting device is used, the rotary supporting device needs to be assembled in advance, namely:

1) assembling the supporting seat 9: the flat plate 901 is processed with a cross-shaped rectangular groove 904, the plane is horizontally arranged on a welding platform upwards, firstly, the end face of the upright post 902, which is processed with a 45-degree chamfer, is inserted into the rectangular groove 904, and the two ends are fixed by positioning welding; then, adhering 2 pieces of rib plates 903 to planes on two sides of the upright post 902 by using right-angle long sides, inserting the right-angle short sides into the rectangular groove 904, and fixing by tack welding; after the fitting between the upright column 902 and the rib plate 903 is corrected, the welding is firm, and 2 sets of bearing seats 9 are assembled by adopting the mode.

2) Assembling the roller 10: sequentially assembling two sets of rolling bearings 1003 on a bearing section of the pin shaft 1001 in an oriented manner by adopting a temperature difference method, and installing a distance ring 1004 between the two sets of rolling bearings 1003; and then after the rolling bearing 1003 is cooled to the room temperature state, the roller sleeve 1002 is directionally assembled on the rolling bearing 1003 by adopting a temperature difference method, and then a spring washer and a hexagonal thread are installed on the threaded section of the pin shaft 1001 on the outer side of the roller sleeve 1002 for fixing.

As shown in fig. 13, the assembly of the supporting seat 9 and the roller 10 included in the design of the rotary supporting device 200 of the present invention is completed, and the rotary supporting device can be installed on a machine for use. When the mandrel chuck is used on site, the threaded inner hole 803 of the guide sleeve 8 needs to be aligned with the tail thread section of the mandrel chuck spindle 11 and screwed and fixed in place. Then, according to the rotation direction (clockwise) of the mandrel chuck, the bearing blocks 9 are respectively fixed in the threaded holes on the outer side of the box body of the feeding rotary gearbox by using the inner hexagon screws 12, at the moment, the openings of the grooves 906 of the left bearing block 9 face downwards, and the openings of the grooves 906 of the right bearing block 9 face upwards. Finally, the rectangular plane section of the pin shaft 1001 of 2 sets of rollers 10 is directionally inserted into the groove 906 of the supporting seat 9, and a phi 24 flat washer, a phi 24 spring washer and an M24 hexagon nut are sequentially installed for fixing and preventing looseness. At the moment, the roller 10 is tightly attached to the end face with the largest diameter of the guide sleeve 8, an external axial positioning component is added to the mandrel chuck device, when the seamless steel tube is rolled, the mandrel holder rotates clockwise, the reaction force is transmitted to the roller 10 through the guide sleeve 8, on one hand, the roller 10 processes axial force and converts the axial force into self synchronous rotation, and on the other hand, the roller plays a role of axial support through the combination of the pin shaft 1001 and the support seat 9.

The rotary supporting device of the utility model improves the movement precision and stability of the mandrel chuck during the processing of the seamless steel tube cold-rolled tube from the source, has reasonable design, compact structure and continuous and stable axial positioning effect, effectively solves the problem of axial movement (play) of the mandrel chuck device, and meets the production requirement of high-grade seamless steel tube precision rolling. The split type structure is reasonable in layout, dynamic and static combination is achieved, the original component structure is not damaged, the requirement of ordered production of a seamless steel pipe cold rolling production line is met, a certain elimination effect is achieved, the cost is reduced, the production promoting effect is achieved, and the functional precision construction is promoted. The two sets of supporting seats are provided with semi-closed positioning grooves for mounting rollers according to the rotating direction of the mandrel chuck, and the closed edges of the positioning grooves are used for circumferential positioning, so that the mandrel chuck is labor-saving, time-saving, safe, reliable, practical and efficient. The guide sleeve is installed by adopting a threaded structure, the daily use and maintenance are convenient, the thread turning direction is consistent with the turning direction of the mandrel chuck, and the anti-loosening and anti-escape functions are stable and reliable. The roller consists of a built-in rolling bearing and a roller sleeve, the rotary motion of the mandrel chuck is converted into the rotary motion of the roller, the axial thrust of the mandrel chuck is converted into the friction force of the roller motion, the influence of axial movement (play) on the supporting seat and the roller is reduced, and the service life of the supporting member is prolonged. The universal mandrel chuck device has strong universality, is improved for the mandrel chuck device in the feeding swing mechanism of the similar two-roller periodic seamless steel tube cold rolling mill at present, and has certain reference and application values.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (8)

1. The utility model provides a rotation support device that is used for mandrel chuck axle on seamless steel pipe cold rolling mill which characterized in that: comprises a guide sleeve, a supporting seat and a roller;

the guide sleeve is connected and fixed on the tail end face of the mandrel chuck main shaft;

the two supporting seats are connected and fixed on the plane of a feeding rotary gear box body at the tail part of the mandrel chuck main shaft and are symmetrically positioned at two sides of the guide sleeve;

the two idler wheels are respectively arranged on the corresponding supporting seats.

2. The rotary supporting device for the mandrel chuck shaft on the seamless steel tube cold rolling mill according to claim 1, characterized in that: the guide sleeve is a concentric and reducing three-section step-shaped cylinder, wherein the axis position of the cylinder at one outer section is provided with an inner hole of the cylinder, and the axis position of the cylinder at the other outer section is provided with an inner hole of a cone;

the inner hole of the cylinder is communicated with the inner hole of the cone through a threaded inner hole.

3. The rotary supporting device for the mandrel chuck shaft on the seamless steel tube cold rolling mill according to claim 2, characterized in that: the large diameter side of the internal thread hole of the cone faces outwards, and the small diameter side of the internal thread hole of the cone faces inwards;

the diameter of the minor diameter is consistent with the diameter of the thread inner hole.

4. The rotary supporting device for the mandrel chuck shaft on the seamless steel tube cold rolling mill according to claim 1, characterized in that: the supporting seat comprises a flat plate, an upright post and a rib plate;

the flat plate is horizontally arranged, the upright post is vertically arranged on the upper surface of the flat plate, and the rib plate is connected between the flat plate and the upright post.

5. The rotary supporting device for the mandrel chuck shaft on the seamless steel tube cold rolling mill according to claim 4, characterized in that: the flat plate is rectangular, and the upper surface of the flat plate is provided with a cross-shaped rectangular groove for mounting the upright post and the rib plate;

round holes are formed in the four corner positions of the flat plate.

6. The rotary supporting device for the mandrel chuck shaft on the seamless steel tube cold rolling mill according to claim 4, characterized in that: a semi-closed groove is formed in the inner side face of the upper portion of the upright post, the bottom of the groove is semicircular, and the circle center of the semicircle coincides with the vertical center line of the upright post.

7. The rotary supporting device for the mandrel chuck shaft on the seamless steel tube cold rolling mill according to claim 4, characterized in that: the rib plates are arranged to be right-angled triangles, and the height of the rib plates is 1/3-2/5 of the height of the upright column.

8. The rotary supporting device for the mandrel chuck shaft on the seamless steel tube cold rolling mill according to claim 6, characterized in that: the roller comprises a pin shaft, a roller sleeve, a rolling bearing, a distance ring, a gasket and a nut;

the pin shaft is arranged to be a concentric and reducing step-shaped cylinder, one end of the pin shaft is matched with the groove in the upright post, and the other end of the pin shaft is matched with the inner diameter of the rolling bearing;

the roller sleeve is sleeved on the outer diameter of the rolling bearing;

the two rolling bearings are provided, and the distance ring is also sleeved on the other end of the pin shaft and is positioned between the two rolling bearings;

the two nuts are respectively arranged on the two end parts of the pin shaft;

the two washers are respectively arranged on the two end parts of the pin shaft and positioned on the inner side of the nut.

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