Hydraulic clamping mechanism for mandril of steel pipe cold rolling mill

Abstract

The utility model discloses a hydraulic clamping mechanism for a mandril of a steel pipe cold rolling mill in the technical field of steel pipe cold rolling mills, which comprises a chuck seat, two fixing plates are mounted on one side of the chuck seat and close to the bottom, a mounting plate is hinged to one side of each fixing plate, a clamping piece for fixing a workpiece is mounted on one side of the chuck seat, and the clamping piece is hinged to the mounting plate. A driving part is installed at the top of the chuck seat, a core rod is clamped through the multiple evenly-distributed clamping parts, each clamping part can act independently, it can be effectively guaranteed that clamping force is evenly distributed on the circumferential surface of the core rod, shaking and deviation of the core rod in the working process are avoided, and the problems that the clamping force of a clamping mechanism is not uniform, and the clamping force is not uniform are solved. The problems that a core rod is likely to shake or deviate in the working process due to the fact that the core rod and the inner wall of a steel pipe are abraded abnormally, the operation of clamping and loosening the core rod by a clamping mechanism is tedious, and the precision and efficiency of steel pipe production and machining are affected are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel pipe cold rolling mill technical field, specifically a kind of steel pipe cold rolling mill mandrel hydraulic clamping mechanism. BACKGROUND

[0002] In the steel pipe cold rolling production process, mandrel plays a vital role. It is inserted into the inside of steel pipe, cooperates with roll to realize the cold rolling processing of steel pipe, so that the required pipe diameter and wall thickness and other dimensional accuracy are obtained. However, the existing mandrel clamping mechanism of steel pipe cold rolling mill has some deficiencies, and the traditional clamping mechanism is often uneven in clamping force, which may cause the mandrel to shake or deviate during work, which not only affects the precision of steel pipe cold rolling, but also may cause abnormal wear of the mandrel and the inner wall of the steel pipe, reduces the product quality of the mandrel and the steel pipe, increases the production cost, and the operation of part of the existing clamping mechanism when clamping and releasing the mandrel is not convenient and efficient, which consumes more time and manpower, thereby affecting the efficiency of the whole steel pipe cold rolling production, and with the increasing requirements of steel pipe cold rolling process on processing precision and production efficiency, the existing clamping mechanism has been difficult to meet the needs of actual production.

[0003] The clamping force of the existing clamping mechanism is uneven, which may cause the mandrel to shake or deviate during work, causing abnormal wear of the mandrel and the inner wall of the steel pipe, and the operation of the clamping mechanism when clamping and releasing the mandrel is relatively cumbersome, affecting the precision and efficiency of steel pipe production and processing, therefore, the technical personnel in the art provides a kind of steel pipe cold rolling mill mandrel hydraulic clamping mechanism to solve the problems raised in the above background technology. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of steel pipe cold rolling mill mandrel hydraulic clamping mechanism to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a kind of steel pipe cold rolling mill mandrel hydraulic clamping mechanism, including chuck seat, two fixed plates are installed in the side of chuck seat and close to bottom, the fixed plate side is hinged with mounting plate, the chuck seat side is installed with the clamping piece for fixing workpiece, the chuck seat top is installed with driving part, the fixed plate is fixedly connected with chuck seat;

[0006] The driving part includes a middle swing frame installed on the top of the chuck seat, an oil cylinder is installed on the inner side of the middle swing frame, a push rod is installed on the inner side of the oil cylinder, a joint rod is installed on one end of the push rod, a driving rod is installed between the two mounting plates and close to the top, the push rod is screw-connected with the driving rod through the joint rod, the driving rod is hinged with the mounting plate, and the oil cylinder is hinged with the middle swing frame.

[0007] The clamping piece comprises a hollow shaft installed in the inner side of the chuck base for placing the core rod, a pushing cylinder sleeved on the outer side of the hollow shaft and close to one end, a three-jaw flange installed on one end of the hollow shaft, and three clamping jaws arranged in a circle on the outer side of the three-jaw flange and hinged with the three-jaw flange.

[0008] Preferably, one side of the mounting plate is provided with a bolt rod, one end of the bolt rod is provided with a mounting block, the outer side of the pushing cylinder is provided with a cover plate close to one end, the bolt rod penetrates through the mounting plate and is screwed therewith, and the bolt rod is rotationally connected with the mounting block without being detached.

[0009] Preferably, grooves are formed on the two sides of the clamping jaw respectively, three groups of limiting blocks arranged in a circle are connected to the inner side of the pushing cylinder, and the limiting blocks are slidingly connected with the grooves.

[0010] Preferably, guide grooves are formed on the top of the clamping jaw and close to the two sides respectively, and three groups of guide portions arranged in a circle are connected to the outer side of the three-jaw flange, and the guide portions are slidingly connected with the guide grooves.

[0011] Preferably, anti-skid strips are laid on one side of the clamping jaw.

[0012] Compared with the prior art, the clamping device has the advantages that:

[0013] 1. In the utility model, through setting up the fixed plate and the mounting plate, the chuck base supports and fixes the mounting plate through the fixed plate, the driving part can drive the clamping piece to release and clamp, a plurality of evenly distributed clamping pieces clamp the core rod, and each clamping piece can act independently, which can effectively ensure that the clamping force is evenly distributed on the circumferential surface of the core rod, and avoids the shaking and deviation of the core rod in the working process.

[0014] 2. In the utility model, through setting up the middle swing frame, the push rod, the driving rod, the hollow shaft, the pushing cylinder, the three-jaw flange and the clamping jaw, a plurality of evenly distributed clamping jaws clamp the core rod, and each clamping jaw can act independently, which can effectively ensure that the clamping force is evenly distributed on the circumferential surface of the core rod, and avoids the shaking and deviation of the core rod in the working process, greatly improves the precision of the steel pipe cold rolling, reduces the abnormal wear of the core rod and the steel pipe, reduces the production cost, the oil cylinder drives the driving rod to move through the joint rod at one end of the push rod, the driving rod moves through the mounting plate, the pushing cylinder extrudes and pushes and shrinks and slides the clamping jaw, so that the three clamping jaws on the outer side of the three-jaw flange expand and clamp, the operation of clamping and releasing the core rod is more convenient and efficient, can quickly respond to production needs, and effectively improves the efficiency of the whole steel pipe cold rolling production. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the whole structure of the utility model;

[0016] Figure 2 It is the front perspective view of the whole structure of the utility model;

[0017] Figure 3 It is the structure schematic view of the three claw flanges and the guide part in the whole structure of the utility model; Figure 1 It is the enlarged view of A in the middle;

[0018] Figure 4 It is the structure schematic view of the three claw flanges and the guide part in the whole structure of the utility model;

[0019] Figure 5 It is the structure schematic view of the pushing cylinder and the limiting block in the whole structure of the utility model;

[0020] Figure 6 It is the structure schematic view of the clamping claw, the recess, the guide groove and the anti-skid strip in the whole structure of the utility model;

[0021] Figure 7 It is the structure schematic view of the mounting plate, the pushing cylinder, the bolt rod, the mounting block, the cover plate and the limiting block in the whole structure of the utility model.

[0022] In the drawing: 1, chuck seat; 2, fixed plate; 3, mounting plate; 4, middle swing frame; 5, oil cylinder; 6, push rod; 7, joint rod; 8, driving rod; 9, hollow shaft; 10, pushing cylinder; 11, three claw flange; 12, clamping claw; 13, bolt rod; 14, mounting block; 15, cover plate; 16, recess; 17, limiting block; 18, guide groove; 19, guide part; 20, anti-skid strip. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0024] Please refer to Figures 1-7 In the embodiments of the utility model, a steel pipe cold rolling machine mandrel hydraulic clamping mechanism, including chuck seat 1, chuck seat 1 one side and close to the bottom is equipped with two fixed plates 2, the fixed plate 2 one side is hinged with mounting plate 3, chuck seat 1 one side is equipped with the clamping piece for fixing workpiece, chuck seat 1 top is equipped with driving piece, fixed plate 2 and chuck seat 1 fixed connection.

[0025] In use, the chuck base 1 supports and fixes the mounting plate 3 through the fixing plate 2, and the clamping part can be released and clamped and fixed by the driving part. The core rod is clamped by the plurality of uniformly distributed clamping parts, and each clamping part can act independently, which can effectively ensure that the clamping force is uniformly distributed on the circumferential surface of the core rod, and avoids the shaking and deviation of the core rod in the working process.

[0026] In one embodiment, specifically, the driving part includes a middle swing frame 4 mounted on the top of the chuck base 1, an oil cylinder 5 is mounted on the inner side of the middle swing frame 4, a push rod 6 is mounted on the inner side of the oil cylinder 5, a joint rod 7 is mounted on one end of the push rod 6, a driving rod 8 is mounted between the two mounting plates 3 and close to the top, the clamping part includes a hollow shaft 9 mounted on the inner side of the chuck base 1 for placing the core rod, a push cylinder 10 is sleeved on the outer side of the hollow shaft 9 and close to one end, a three-jaw flange 11 is mounted on one end of the hollow shaft 9, three clamping jaws 12 arranged in a circle are mounted on the outer side of the three-jaw flange 11, anti-skid strips 20 are laid on one side of the clamping jaws 12, the three-jaw flange 11 is hinged with the clamping jaws 12, the push rod 6 is screw-connected with the driving rod 8 through the joint rod 7, the driving rod 8 is hinged with the mounting plate 3, and the oil cylinder 5 is hinged with the middle swing frame 4.

[0027] The plurality of uniformly distributed clamping jaws 12 clamp the core rod, and each clamping jaw 12 can act independently, which can effectively ensure that the clamping force is uniformly distributed on the circumferential surface of the core rod, and avoids the shaking and deviation of the core rod in the working process, greatly improves the precision of the steel pipe cold rolling, reduces the abnormal wear of the core rod and the steel pipe, reduces the production cost, and makes the operation of clamping and loosening the core rod more convenient and efficient, can quickly respond to production needs, and effectively improves the efficiency of the entire steel pipe cold rolling production.

[0028] Further, a bolt rod 13 is mounted on one side of the mounting plate 3, an installation block 14 is mounted on one end of the bolt rod 13, a cover plate 15 is mounted on the outer side of the push cylinder 10 and close to one end, the bolt rod 13 penetrates through the mounting plate 3 and is screw-connected therewith, and the bolt rod 13 is rotationally connected with the installation block 14 and does not come off.

[0029] In one embodiment, specifically, the bolt rod 13 can be screw-connected and fixed through the mounting plate 3, then the installation block 14 at one end of the bolt rod 13 is embedded in the outer side of the push cylinder 10, then the installation block 14 is located on one side of the cover plate 15, and the push cylinder 10 can drive the installation block 14 to rotate on the outer side of the bolt rod 13.

[0030] The two sides of the clamping jaw 12 are respectively provided with grooves 16, three groups of limiting blocks 17 are circumferentially arranged on the inner side of the pushing cylinder 10, the top of the clamping jaw 12 and close to the two sides are respectively provided with guide grooves 18, three groups of guide portions 19 are circumferentially arranged on the outer side of the three-jaw flange 11, the guide portions 19 are slidably connected with the guide grooves 18, the limiting blocks 17 are slidably connected with the grooves 16, the limiting blocks 17 can slide in the grooves 16, and the guide portions 19 can slide in the guide grooves 18, so that the limiting blocks 17 and the guide portions 19 guide and limit the clamping jaw 12 from different directions, and the clamping jaw 12 is prevented from deviating or shaking.

[0031] The working principle of the utility model is as follows:

[0032] First, when the mandrel does not need to be clamped, the push rod 6 of the oil cylinder 5 is in the retracted state, the joint rod 7 is retracted by the push rod 6, the joint rod 7 drives the mounting plate 3 to be hinged to rotate on one side of the fixed plate 2 by the driving rod 8, the two mounting plates 3 drive the pushing cylinder 10 in the mounting block 14 to move backward by the bolt rod 13, so that the clamping jaw 12 is in the loosening position, at this time, the mandrel can smoothly pass through the center hole of the clamping seat, when the mandrel needs to be clamped, the push rod 6 of the oil cylinder 5 is extended, the push rod 6 drives the mounting plate 3 to be extended by the joint rod 7 through the driving rod 8, the two mounting plates 3 drive the pushing cylinder 10 in the mounting block 14 to move outside the hollow shaft 9 by the bolt rod 13, the pushing cylinder 10 extrudes and pushes the three clamping jaws 12 on the outer side of the three-jaw flange 11, the plurality of clamping jaws 12 act simultaneously, the clamping jaws 12 gradually fit the outer surface of the mandrel to clamp the mandrel, after the mandrel is clamped, steel pipe cold rolling processing operation can be carried out.

[0033] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A hydraulic clamping mechanism for a mandrel of a steel tube cold rolling mill, comprising a chuck seat (1), characterized in that: Two fixing plates (2) are installed on one side of the chuck seat (1) and near the bottom, a mounting plate (3) is hinged on one side of the fixing plate (2), a clamping member for fixing a workpiece is installed on one side of the chuck seat (1), a driving member is installed on the top of the chuck seat (1), and the fixing plate (2) is fixedly connected to the chuck seat (1); The driving member includes a middle swing frame (4) mounted on the top of the chuck seat (1), an oil cylinder (5) is mounted on the inner side of the middle swing frame (4), a push rod (6) is mounted on the inner side of the oil cylinder (5), a joint rod (7) is mounted on one end of the push rod (6), a driving rod (8) is mounted between the two mounting plates (3) and near the top, the push rod (6) is screwed to the driving rod (8) through the joint rod (7), the driving rod (8) is hinged to the mounting plate (3), and the oil cylinder (5) is hinged to the middle swing frame (4); The clamping member includes a hollow shaft (9) installed on the inner side of the chuck seat (1) for placing the core rod, a push cylinder (10) is installed on the outer side of the hollow shaft (9) and close to one end, a three-claw flange (11) is installed at one end of the hollow shaft (9), and three clamping jaws (12) arranged in a circumference are installed on the outer side of the three-claw flange (11), and the three-claw flange (11) is hinged to the clamping jaws (12).

2. The hydraulic clamping mechanism for a cold rolling mill mandrel of a steel tube according to claim 1, characterized in that: A bolt rod (13) is installed on one side of the mounting plate (3), and a mounting block (14) is installed on one end of the bolt rod (13). A cover plate (15) is installed on the outside of the push cylinder (10) and near one end. The bolt rod (13) passes through the mounting plate (3) and is screwed thereto. The bolt rod (13) is rotatably connected to the mounting block (14) and does not separate.

3. The hydraulic clamping mechanism for a cold rolling mill mandrel of a steel tube according to claim 2, characterized in that: Grooves (16) are respectively provided on both sides of the clamping jaw (12), and three groups of circumferentially arranged limit blocks (17) are connected to the inner side of the pushing cylinder (10), and the limit blocks (17) are slidably connected to the grooves (16).

4. The hydraulic clamping mechanism for a cold rolling mill mandrel of a steel tube according to claim 3, characterized in that: Guide grooves (18) are respectively provided at the top and near both sides of the clamping jaw (12), and three groups of guide parts (19) arranged in a circumference are connected to the outer side of the three-jaw flange (11), and the guide parts (19) are slidably connected to the guide grooves (18).

5. The hydraulic clamping mechanism for a cold rolling mill mandrel of a steel tube according to claim 3, characterized in that: An anti-slip strip (20) is provided on one side of the clamping jaw (12).

Images