Sizing mill for hot-rolled steel pipe production

Abstract

The utility model belongs to the field of hot-rolled steel pipe production, and discloses a sizing mill for hot-rolled steel pipe production, which comprises a main machine device for rolling and sizing a hot-rolled steel pipe, and further comprises a rack device for supporting the main machine device to rotate, and a driving device for providing rotating power is arranged in front of the rack device; the machine frame device comprises a foundation bottom plate, two bearing frames are symmetrically installed on the foundation bottom plate, and a rotary bearing is installed between the bearing frames. The driving device comprises a driven wheel ring, a driving wheel is arranged on one side of the driven wheel ring, a transmission belt is installed between the driven wheel ring and the driving wheel, and a swing motor is arranged behind the driving wheel. According to the sizing mill for producing the hot-rolled steel pipe, the three rollers are distributed in an equilateral triangle shape and are of a tooth-meshed homodromous rotating structure, and the reciprocating swinging design is combined, so that the rollers can conduct comprehensive rolling in the circumferential direction of the steel pipe, the non-rolling area between the head and the tail of each roller in a traditional sizing mill is eliminated, and the uniformity and the surface quality of the outer diameter of the steel pipe are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of hot-rolled steel pipe production, and in particular relates to a sizing machine for hot-rolled steel pipe production. Background Technology

[0002] The hot-rolled steel pipe sizing mill is one of the key pieces of equipment in a steel pipe production line, mainly used for precise control of the outer diameter and wall thickness of hot-rolled steel pipes. This equipment uses a multi-stand rolling process to continuously roll the steel pipe at high temperatures, ultimately achieving the required standard dimensions and roundness. In terms of process principle, the sizing mill utilizes the plastic deformation characteristics of metals at high temperatures. After the steel pipe passes through a reheat furnace at 950-1100℃, it enters the sizing mill. The roll passes of each stand gradually decrease in size, and through precise adjustment of the roll gap, the outer diameter of the steel pipe gradually approaches the target dimension.

[0003] Comparing with Chinese Patent CN215467042U, a hot-rolled seamless steel pipe sizing machine is disclosed, including a machine body, a scraping mechanism, and a base. The scraping mechanism is located inside the machine body, and the base is fixedly installed at the bottom of the machine body. The scraping mechanism includes a fixed seat and a first limiting groove. The first limiting groove is opened in the middle of the fixed seat, and a top column is inserted into the first limiting groove. By setting the scraping mechanism at the lower end of the roll inside the machine body, the scraper in the scraping mechanism is in close contact with the bottom of the roll groove. The return spring inside the top column generates an upward thrust on the top column, causing the top column to push the scraper up and down, so that the scraper is always in close contact with the roll groove of the roll. When the sizing machine sizings the steel pipe, the roll groove of the roll is always scraped and impurities are removed by the scraper during the rotation of the roll, avoiding impurity particles from appearing in the roll groove and scratching the steel pipe, thus improving the quality of the finished steel pipe.

[0004] However, there are gaps at the joints of the three rolls in the above-mentioned patent, which can easily lead to areas on the surface of the hot-rolled steel pipe that are not rolled, seriously affecting the uniformity of the outer diameter and the surface quality of the hot-rolled steel pipe. Therefore, a new device needs to be designed. Utility Model Content

[0005] The purpose of this utility model is to provide a sizing machine for hot-rolled steel pipe production to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A sizing mill for hot-rolled steel pipe production includes a main unit for sizing hot-rolled steel pipes by rolling, and a frame unit for supporting the rotation of the main unit. A drive device for providing rotational power is provided at the front of the frame unit. The main unit includes a main body, a front support bracket is provided at the front of the main body, and a rear support bracket is provided at the rear of the main body. The frame unit includes a base plate, on which two support brackets are symmetrically mounted, and a slewing bearing is installed in the middle of the support brackets. The drive device includes a driven wheel ring, a driving wheel is provided on one side of the driven wheel ring, a transmission belt is installed between the driven wheel ring and the driving wheel, and a swivel motor is provided behind the driving wheel.

[0008] Furthermore: the main body includes a chassis, a chassis cover is installed on the front of the chassis, and three rollers are evenly distributed inside the chassis. The three rollers are distributed in an equilateral triangle and adopt a toothed co-rotating structure. A rotary motor is provided on one side of one of the rollers.

[0009] Furthermore: the front support bracket and the chassis cover are integrally formed, and the rear support bracket and the chassis body are integrally formed.

[0010] Furthermore, the base plate has four mounting slots evenly distributed at its four corners, and the mounting slots are U-shaped.

[0011] Furthermore, the support frame is inverted L-shaped and is bolted to the foundation plate.

[0012] Furthermore: the passive wheel ring and the front support bracket are bolted together, and the swing motor and the support bracket are bolted together.

[0013] Furthermore, the transmission belt is a toothed belt, and the oscillating motor is a servo motor.

[0014] Compared with existing technologies, the beneficial effects are:

[0015] 1. By using the equilateral triangle distribution of three rolls and the toothed co-rotating structure, combined with the reciprocating swing design, the rolls can roll the steel pipe circumferentially, eliminating the unrolled area between the beginning and end of the rolls in the traditional sizing mill, and significantly improving the uniformity of the outer diameter and surface quality of the steel pipe.

[0016] 2. The toothed belt drive system driven by a servo motor enables precise reciprocating rotation of the passive pulley ring. The rotation angle and speed can be flexibly adjusted according to process requirements to adapt to the sizing requirements of steel pipes of different specifications. The bolt connection between the inverted L-shaped support frame and the U-shaped channel base plate, combined with the slewing bearing support, ensures the stability of the main unit during dynamic rotation and reduces the impact of vibration on processing accuracy.

[0017] 3. The slewing bearing supports the rotating parts of the main unit, reducing friction loss; the toothed belt drive is more impact-resistant and has lower noise than the gear drive, making it suitable for long-term high-frequency operation; the integrated molding design (the front / rear bearing tubes are integrally molded with the cover and the chassis body respectively) reduces connecting parts, lowers the risk of assembly errors, and improves overall rigidity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a sizing machine for hot-rolled steel pipe production according to the present invention;

[0019] Figure 2 This is an isometric view of the main unit of the sizing mill for hot-rolled steel pipe production described in this utility model;

[0020] Figure 3 This is a front view of the main unit of the sizing machine for hot-rolled steel pipe production described in this utility model;

[0021] Figure 4 This is a rear-view isometric view of the main unit of the sizing mill for hot-rolled steel pipe production described in this utility model;

[0022] Figure 5 This is a schematic diagram of the frame device of a sizing machine for hot-rolled steel pipe production according to the present invention;

[0023] Figure 6 This is a schematic diagram of the drive device for a sizing machine used in the production of hot-rolled steel pipes according to this utility model.

[0024] In the attached drawings, the following are the reference numerals: 101, machine housing; 102, machine housing cover; 103, rolling mill roll; 104, rotary motor; 105, front support bracket; 106, rear support bracket; 201, support frame; 202, slewing bearing; 203, foundation plate; 204, mounting groove; 301, driven wheel ring; 302, driving wheel; 303, transmission belt; 304, oscillating motor. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-6 A sizing machine for hot-rolled steel pipe production includes a main unit for rolling and sizing hot-rolled steel pipes, and a frame unit for supporting the rotation of the main unit. A drive unit for providing rotational power is provided in front of the frame unit.

[0027] In this embodiment: the main unit includes a main body, a front support bracket 105 is provided at the front of the main body, and a rear support bracket 106 is provided at the rear of the main body; the main body includes a chassis 101, a chassis cover 102 is installed at the front of the chassis 101, and three rollers 103 are evenly distributed inside the chassis 101. The three rollers 103 are arranged in an equilateral triangle and adopt a toothed co-rotating structure. A rotary motor 104 is provided on one side of one of the rollers 103; the front support bracket 105 and the chassis cover 102 are integrally formed, and the rear support bracket 106 is provided at the rear of the chassis 101. The support tube 106 and the machine housing 101 are integrally formed; during operation, the hot-rolled steel pipe passes through the center surrounded by three rollers 103. The machine housing 101 supports the rotary motor 104 to drive the three rollers 103 to rotate in the same direction through gear meshing, rolling the hot-rolled steel pipe to sizing. The machine housing cover 102 is connected to the slewing bearing 202 on the front support frame 201 through the front support tube 105 to obtain rotational support. The machine housing 101 is connected to the slewing bearing 202 on the rear support frame 201 through the rear support tube 106 to obtain rotational support.

[0028] In this embodiment: the frame device includes a base plate 203, on which two support brackets 201 are symmetrically installed. A slewing bearing 202 is installed in the middle of the support brackets 201. Four mounting slots 204 are evenly arranged at the four corners of the base plate 203. The mounting slots 204 are U-shaped. The support brackets 201 are inverted L-shaped and bolted to the base plate 203. The base plate 203 is fixed to the foundation through the mounting slots 204. The support brackets 201 support the front support bracket 105 and the rear support bracket 106 through the slewing bearing 202.

[0029] In this embodiment: the driving device includes a passive wheel ring 301, a driving wheel 302 is provided on one side of the passive wheel ring 301, a transmission belt 303 is installed between the passive wheel ring 301 and the driving wheel 302, and a swing motor 304 is provided behind the driving wheel 302; the passive wheel ring 301 is bolted to the front support tube 105, and the swing motor 304 is bolted to the support frame 201; the transmission belt 303 is a toothed belt, and the swing motor 304 is a servo motor; the swing motor 304 drives the driving wheel 302 to drive the passive wheel ring 301 to reciprocate through the transmission belt 303, and the passive wheel ring 301 drives the machine cover 102 and the machine body 101 to reciprocate through the front support tube 105, so that the three rolls 103 rotate and roll along the circumference of the hot-rolled steel pipe, avoiding the appearance of unrolled areas between the beginning and end of the three rolls 103.

[0030] Working principle: The base plate 203 is fixed to the foundation through the mounting groove 204. The support bracket 201 supports the front support tube 105 and the rear support tube 106 through the slewing bearing 202. During operation, the hot-rolled steel pipe passes through the center formed by the three rollers 103. The machine housing 101 supports the rotary motor 104 to drive the three rollers 103 to rotate in the same direction through gear meshing, rolling the hot-rolled steel pipe to set the sizing. At the same time, the support bracket 201 supports the swing motor 304 to drive the drive wheel 302 to drive the passive wheel ring 301 to swing back and forth through the transmission belt 303. The passive wheel ring 301 drives the machine housing cover 102 and the machine housing 101 to swing back and forth through the front support tube 105, so that the three rollers 103 rotate and roll along the circumference of the hot-rolled steel pipe, avoiding the absence of unrolled areas between the beginning and end of the three rollers 103.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sizing mill for hot-rolled steel pipe production, comprising a main unit for sizing hot-rolled steel pipes by rolling, characterized in that: It also includes a frame assembly for supporting the rotation of the main unit, and a drive device for providing rotational power is provided at the front of the frame assembly; The host device includes a host body, a front support (105) is provided at the front of the host body, and a rear support (106) is provided at the rear of the host body. The frame device includes a base plate (203), on which two support frames (201) are symmetrically installed, and a slewing bearing (202) is installed in the middle of the support frame (201); The driving device includes a passive wheel ring (301), a driving wheel (302) is provided on one side of the passive wheel ring (301), a transmission belt (303) is installed between the passive wheel ring (301) and the driving wheel (302), and a swing motor (304) is provided behind the driving wheel (302).

2. A sizing mill for the production of hot-rolled steel pipes according to claim 1, characterized in that: The main body includes a chassis (101), a chassis cover (102) is installed on the front of the chassis (101), and three rollers (103) are evenly distributed inside the chassis (101). The three rollers (103) are arranged in an equilateral triangle and adopt a toothed co-rotating structure. A rotary motor (104) is provided on one side of one of the rollers (103).

3. A sizing mill for the production of hot-rolled steel pipes according to claim 2, characterized in that: The front support bracket (105) and the chassis cover (102) are integrally formed, and the rear support bracket (106) and the chassis body (101) are integrally formed.

4. A sizing mill for the production of hot-rolled steel pipes according to claim 1, characterized in that: The base plate (203) has four mounting slots (204) evenly arranged at its four corners, and the mounting slots (204) are U-shaped slots.

5. A sizing mill for the production of hot-rolled steel pipes according to claim 4, characterized in that: The support frame (201) is inverted L-shaped and is bolted to the base plate (203).

6. A sizing mill for the production of hot-rolled steel pipes according to claim 1, characterized in that: The passive wheel ring (301) and the front support bracket (105) are bolted together, and the swing motor (304) and the support frame (201) are bolted together.

7. A sizing mill for the production of hot-rolled steel pipes according to claim 6, characterized in that: The transmission belt (303) is a toothed belt, and the swing motor (304) is a servo motor.

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