Axial clearance adjusting and locking device of electric screw press

Abstract

An axial clearance adjusting and locking device of an electric screw press comprises a cross beam, a screw, a thrust bearing cover, a thrust bearing, a roller bearing seat, a flywheel, a thrust self-aligning roller bearing, an adjusting gasket installed on the shoulder of the screw, an adjusting gland installed on the top face of the flywheel, a double-end pre-tightening bolt and a pre-tightening sleeve installed on the double-end pre-tightening bolt. The adjusting gland, the pre-tightening sleeve and the double-end pre-tightening bolt are pre-tightened on the top surface of the flywheel through the small round nut, the large round nut is in threaded connection with the upper end of the screw rod, the expansion connecting sleeve is installed between the screw rod and the large round nut, and the positioning key is arranged between the adjusting gland and the top surface of the flywheel. The adjusting gland is prevented from rotating, the pre-tightening effect is good, a proper and stable axial clearance value is ensured, the bearing capacity of the screw rod is ensured, the service life of the screw rod is long, the large round nut and the screw rod are reliably locked, dust prevention is conducted on the thrust bearing, clearance adjustment is convenient, and efficiency is high. The device can be widely applied to the electric screw press.

Description

Technical Field

[0001] The present invention relates to an axial clearance adjustment and locking device for an electric screw press, which can be widely applied to electric screw presses. Background Art

[0002] The shoulder of the screw bearing of the screw press plays a crucial role during the operation of the entire press. From a mechanical structure perspective, the shoulder of the screw bearing can axially position the thrust bearing, keeping the thrust bearing in a stable position on the screw, preventing its axial movement, ensuring the accurate relative positions of all components during the operation of the press, and guaranteeing the normal operation of the press. At the same time, in terms of bearing loads, the shoulder of the screw bearing can assist the thrust bearing in sharing a part of the axial force generated during the operation of the press, avoiding damage to the thrust bearing due to excessive local stress, and enhancing the stability and load-bearing capacity of the overall structure.

[0003] During the operation of the press, wear problems will occur between the shoulder of the screw bearing and the thrust bearing. Normal fatigue wear of metals is an important reason for the wear of the shoulder of the screw bearing. Due to the long-term high-load working state of the press, the shoulder of the screw bearing is constantly subjected to friction and impact, and the metal material of the shoulder of the screw bearing will gradually show wear.

[0004] The size of the axial clearance between the shoulder of the screw bearing and the thrust bearing directly determines whether the electric screw press can be used normally and the service life of the entire equipment. Therefore, it is necessary to adjust it in time to keep an appropriate and stable axial clearance value. Whether this clearance value can be locked for a long time after being adjusted, and whether it is convenient to adjust this clearance value again after several years becomes extremely crucial.

[0005] In the existing axial clearance adjustment device for the shoulder of the screw bearing and the thrust bearing, the adjusting gland is directly fixed on the top surface of the flywheel with bolts and there is no positioning key for positioning. Therefore, the adjusting gland is subjected to axial and normal forces and will rotate. During the operation of the press, due to the huge instantaneous rebound force and torsional force during the impact of the press, the fixed bolts are frequently cut off. The fracture of the bolts causes the axial clearance between the screw and the thrust bearing to become larger and larger, the impact force to become larger and larger, the wear of the shoulder of the screw bearing to be large, the service life of the screw to be short, and the manufacturing accuracy of the forging to be low.

[0006] The reasons for the fracture of the bolts of the traditional press are as follows: the pre-tightening forces of the bolts used are different, and a single bolt cannot withstand the impact force of the adjusting gland. Therefore, the bolts break successively according to the strength of the bolt pre-tightening force. The adjusting gland is also subject to a normal force. The large round nut pressed on the adjusting gland uses a method of fixing with a square key and the screw rod. As the service life of the press increases, the clearance between the square key and the keyway increases, and the connection between the screw rod and the large round nut becomes loose. The two cannot be locked tightly, resulting in the large round nut rotating back and forth, and the adjusting gland rotating simultaneously, shearing the bolt and causing the bolt to break. Summary of the Invention

[0007] The purpose of the present invention is to provide an axial clearance adjustment and locking device for an electric screw press that can prevent the adjusting gland from rotating, has a good pre-tightening effect, ensures a proper and stable axial clearance value, ensures the load-bearing capacity of the screw rod, has a long service life of the screw rod, has a reliable locking between the large round nut and the screw rod, dust-proofs the thrust bearing, is convenient for clearance adjustment, and has high efficiency.

[0008] To achieve the above purpose, the axial clearance adjustment and locking device for the electric screw press of the present invention includes a cross beam, a screw rod installed in the central hole of the press cross beam, a thrust bearing cover fastened to the large central hole on the bottom surface of the cross beam through a tension bolt, a thrust bearing located between the bearing shoulder of the screw rod and the thrust bearing cover and installed on the bearing shoulder of the screw rod, a roller bearing seat fastened to the large central hole on the top surface of the cross beam through a fastening bolt, a flywheel connected to the screw rod by a key connection, a spherical roller thrust bearing located on the top surface of the cross beam and connected to the flywheel in a convex-concave manner and installed on the roller bearing seat, an adjusting gasket installed on the shoulder of the screw rod, an adjusting gland combined with the top surface of the flywheel in a convex-concave manner and pressing against the adjusting gasket and installed on the top surface of the flywheel, a double-headed pre-tightening bolt for pre-tightening the adjusting gland to the top surface of the flywheel, a pre-tightening sleeve closely attached to the top surface of the adjusting gland and installed on the double-headed pre-tightening bolt, a small round nut for pre-tightening the adjusting gland, the pre-tightening sleeve, and the double-headed pre-tightening bolt to the top surface of the flywheel, a large round nut threadedly connected to the upper end of the screw rod, an expansion connection sleeve installed between the screw rod and the large round nut, and a positioning key provided between the adjusting gland and the top surface of the flywheel.

[0009] For the axial clearance adjustment and locking device of the electric screw press of the present invention, the small round nut is provided with a transverse rotation hole for inserting a hand lever for rotation.

[0010] For the axial clearance adjustment and locking device of the electric screw press of the present invention, the large round nut is provided with a transverse rotation hole for inserting a hand lever for rotation.

[0011] For the axial clearance adjustment and locking device of the electric screw press of the present invention, the thrust bearing is made of copper material.

[0012] For the axial clearance adjustment and locking device of the electric screw press of the present invention, the positioning key serves to prevent the adjusting gland from rotating.

[0013] For the axial clearance adjustment and locking device of the electric screw press of the present invention, the thrust bearing cover surrounds the thrust bearing, which not only acts as a bearing seat but also plays a role in dust prevention for the thrust bearing.

[0014] For the axial clearance adjustment and locking device of the electric screw press of the present invention, a double-headed pre-tightening bolt and pre-tightening sleeve structure is adopted. Through a special pre-tightening tooling, the pre-tightening force of each double-headed pre-tightening bolt is ensured to be the same. The setting of the pre-tightening sleeve in the present invention lengthens the double-headed pre-tightening bolt, making the double-headed pre-tightening bolt have a certain elasticity and reducing its stiffness. Therefore, the pre-tightening effect of the present invention is good, ensuring a proper and stable axial clearance value between the bearing shoulder bearing surface and the thrust bearing, keeping the thrust bearing in a stable position on the screw, preventing axial movement of the thrust bearing, ensuring the accurate relative positions of each component, and guaranteeing the normal operation of the press.

[0015] For the axial clearance adjustment and locking device of the electric screw press of the present invention, the thrust bearing is made of copper material. Therefore, the friction contact surface between the thrust bearing and the screw is the contact between a soft copper material and a hard steel material, with a small friction coefficient and small frictional force, and it is not easy for the hard screw bearing shoulder bearing surface to be scratched and worn. Therefore, the load-bearing capacity of the screw is ensured and the service life of the screw is long.

[0016] For the axial clearance adjustment and locking device of the electric screw press of the present invention, compared with the prior art, the fixing between the large round nut and the screw adopts a shrink fit sleeve connection. Therefore, the large round nut and the screw are reliably locked.

[0017] For the axial clearance adjustment and locking device of the electric screw press of the present invention, when the thrust bearing wears and it is necessary to maintain a proper axial clearance value, the thickness of the adjustment shim can be changed to realize the adjustment of the axial clearance between the screw bearing shoulder bearing surface and the thrust bearing. Therefore, the clearance adjustment is convenient and efficient.

[0018] In summary, for the axial clearance adjustment and locking device of the electric screw press of the present invention, it prevents the adjusting gland from rotating, has a good pre-tightening effect, ensures a proper and stable axial clearance value, ensures the load-bearing capacity of the screw, has a long service life of the screw, reliably locks the large round nut and the screw, dust-proofs the thrust bearing, is convenient for clearance adjustment, and has high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and their embodiments.

[0020] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In Figure 1In the axial clearance adjustment and locking device of the electric screw press of the present invention, it includes a crossbeam 1, a screw rod 2 installed in the central hole of the press crossbeam, a thrust bearing cover 4 fastened to the large central hole on the bottom surface of the crossbeam through a tension bolt 3, a thrust bearing 5 located between the bearing shoulder of the screw rod and the thrust bearing cover and installed on the bearing shoulder a of the screw rod, a roller bearing seat 7 fastened to the large central hole on the top surface of the crossbeam through a fastening bolt 6, a flywheel 8 connected to the screw rod by a key connection, a thrust self-aligning roller bearing 9 located on the top surface of the crossbeam and convex-concave connected with the flywheel and installed on the roller bearing seat, an adjusting gasket 10 installed on the shoulder of the screw rod, an adjusting gland 11 combined with the top surface of the flywheel in a convex-concave manner and pressing against the adjusting gasket and installed on the top surface of the flywheel, a double-headed pre-tightening bolt 12 for pre-tightening the adjusting gland to the top surface of the flywheel, a pre-tightening sleeve 13 closely attached to the top surface of the adjusting gland and installed on the double-headed pre-tightening bolt, a small round nut 14 for pre-tightening the adjusting gland, the pre-tightening sleeve and the double-headed pre-tightening bolt to the top surface of the flywheel, a large round nut 15 threadedly connected to the upper end of the screw rod, an expansion sleeve 16 installed between the screw rod and the large round nut, and a positioning key 17 arranged between the adjusting gland and the top surface of the flywheel.

[0022] In the axial clearance adjustment and locking device of the electric screw press of the present invention, the small round nut 14 is provided with a transverse rotation hole for inserting a hand rod to rotate.

[0023] In the axial clearance adjustment and locking device of the electric screw press of the present invention, the large round nut 15 is provided with a transverse rotation hole for inserting a hand rod to rotate.

[0024] In the axial clearance adjustment and locking device of the electric screw press of the present invention, the thrust bearing 5 is made of copper material.

[0025] In the axial clearance adjustment and locking device of the electric screw press of the present invention, the positioning key 17 functions to prevent the adjusting gland from rotating.

[0026] In the axial clearance adjustment and locking device of the electric screw press of the present invention, the thrust bearing cover 4 encloses the thrust bearing, which not only functions as a bearing seat but also plays a role in dust prevention for the thrust bearing.

[0027] In summary, only the preferred embodiments of the present invention have been described above. It should be noted that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art, without departing from the scope of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An axial clearance adjustment and locking device for an electric screw press, characterized in that It includes a crossbeam, a screw rod installed in the central hole of the crossbeam of the press, a thrust bearing cover fastened to the large central hole on the bottom surface of the crossbeam through a tension bolt, a thrust bearing located between the bearing shoulder of the screw rod and the thrust bearing cover and installed on the bearing shoulder of the screw rod, a roller bearing seat fastened to the large central hole on the top surface of the crossbeam through a fastening bolt, a flywheel connected to the screw rod by a key connection, a spherical roller thrust bearing located on the top surface of the crossbeam and connected to the flywheel in a convex-concave manner and installed on the roller bearing seat, an adjusting shim installed on the shoulder of the screw rod, an adjusting gland combined with the top surface of the flywheel in a convex-concave manner and pressing against the adjusting shim and installed on the top surface of the flywheel, a double-headed pre-tightening bolt for pre-tightening the adjusting gland to the top surface of the flywheel, a pre-tightening sleeve closely attached to the top surface of the adjusting gland and installed on the double-headed pre-tightening bolt, a small round nut for pre-tightening the adjusting gland, the pre-tightening sleeve and the double-headed pre-tightening bolt to the top surface of the flywheel, a large round nut threadedly connected to the upper end of the screw rod, an expansion sleeve installed between the screw rod and the large round nut, and a positioning key provided between the adjusting gland and the top surface of the flywheel.

2. The axial clearance adjustment and locking device of the electric screw press according to claim 1, characterized in that, The small round nut is provided with a transverse rotation hole for inserting a hand lever to rotate.

3. The axial clearance adjustment and locking device of the electric screw press according to claim 1, characterized in that, The large round nut is provided with a transverse rotation hole for inserting a hand lever to rotate.

4. The axial clearance adjustment and locking device of the electric screw press according to claim 1, characterized in that, The thrust bearing is made of copper material.

5. The axial clearance adjustment and locking device for an electric screw press according to claim 1, characterized in that, The positioning key serves to prevent the adjusting gland from rotating.

6. The axial clearance adjustment and locking device of the electric screw press according to claim 1, characterized in that, The thrust bearing cover encloses the thrust bearing, which not only acts as a bearing seat but also plays a role in dust prevention for the thrust bearing.

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