CN214186284U

CN214186284U - Lead screw pre-stretching adjusting mechanism of gantry machining center

Info

Publication number: CN214186284U
Application number: CN202020934316.9U
Authority: CN
Inventors: 耿辉芳; 李军强
Original assignee: Neway Cnc Equipment Suzhou Co ltd
Current assignee: Neway Cnc Equipment Suzhou Co ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2021-09-14
Anticipated expiration: 2030-05-28

Abstract

The utility model discloses a longmen machining center lead screw pretension guiding mechanism, including the lead screw, the bearing frame, bearing assembly and lock nut, the lead screw is located to the bearing assembly cover, bearing assembly and partial lead screw are located the bearing frame, lock nut installs in the lead screw tip, longmen machining center lead screw pretension guiding mechanism still includes the spacer, elastic component and clamp plate, the spacer is contradicted with the bearing assembly, the clamp plate is installed between spacer and lock nut, the elastic component both ends are contradicted with spacer and clamp plate respectively, the lead screw is when pretensioning, as long as twist lock nut suitable size and just can know that the lead screw pretensions how big power, and easy operation is convenient, and positioning accuracy is high.

Description

Lead screw pre-stretching adjusting mechanism of gantry machining center

Technical Field

The utility model relates to a lathe especially relates to a longmen machining center lead screw prestretches guiding mechanism.

Background

The purpose of prestretching the screw rod of the driving shaft of the gantry machining center is to prevent the screw rod from excessively drooping under the condition of self weight and prevent the screw rod from generating heat during the operation to influence the operation precision. The traditional pretensioning is achieved by converting pretensioning force given by a lead screw manufacturer into torque and tightening the torque by a torque wrench. In practice, due to different sizes of the lead screws, the lead screws are difficult to be consistent with the requirements of lead screw manufacturers, and the precision of a machine tool is difficult to influence.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a longmen machining center lead screw prestretches guiding mechanism with simple operation and high positioning accuracy.

The purpose of the utility model is realized by adopting the following technical scheme:

the lead screw pre-stretching adjusting mechanism for the gantry machining center comprises a lead screw, a bearing seat, a bearing assembly and a locking nut, wherein the bearing assembly is sleeved on the lead screw, the bearing assembly and part of the lead screw are positioned in the bearing seat, the locking nut is installed at the end part of the lead screw, the lead screw pre-stretching adjusting mechanism for the gantry machining center further comprises a spacer bush, an elastic piece and a pressing plate, the spacer bush is abutted against the bearing assembly, the pressing plate is installed between the spacer bush and the locking nut, and two ends of the elastic piece are abutted against the spacer bush and the pressing plate respectively.

Further, the elastic member is a disc spring.

Further, a gap exists between the pressing plate and the spacer bush.

Further, the locking nut abuts against the pressing plate.

Further, the bearing assembly comprises a front bearing, a rear bearing and a spacer assembly, the front bearing, the rear bearing and the spacer assembly are sleeved on the lead screw, and the spacer assembly is located between the front bearing and the rear bearing.

Further, the spacer bush assembly comprises an outer spacer bush and an inner spacer bush, the outer spacer bush is sleeved on the inner spacer bush, and two ends of the outer spacer bush and two ends of the inner spacer bush respectively abut against the front bearing and the rear bearing.

Further, a gap exists between the outer spacer and the inner spacer.

Further, the screw rod pre-stretching adjusting mechanism of the gantry machining center further comprises a gland, wherein the gland is installed on the partition sleeve, and the end part of the gland is abutted against the bearing seat and the front bearing.

Compared with the prior art, the utility model discloses longmen machining center lead screw prestretches guiding mechanism still includes spacer, elastic component and clamp plate, and the spacer is contradicted with the bearing assembly, and the clamp plate is installed between spacer and lock nut, and the elastic component both ends are contradicted with spacer and clamp plate respectively, and the lead screw is when prestretching, as long as twist lock nut suitable size and just can know that the lead screw prestretches how big power, and easy operation is convenient, and positioning accuracy is high.

Drawings

Fig. 1 is a schematic structural view of the screw rod pre-stretching adjusting mechanism of the gantry machining center of the present invention.

In the figure: 10. a lead screw; 20. a bearing seat; 21. a step portion; 30. a bearing assembly; 31. a front bearing; 32. an outer spacer sleeve; 33. an inner spacer sleeve; 34. a rear bearing; 40. a gland; 50. a spacer sleeve; 60. an elastic member; 70. pressing a plate; 80. and locking the nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, in order to show an embodiment of the screw rod pretensioning adjusting mechanism of the gantry machining center of the present invention, the screw rod pretensioning adjusting mechanism of the gantry machining center includes a screw rod 10, a bearing seat 20, a bearing assembly 30, a gland 40, a spacer 50, an elastic member 60, a pressing plate 70, and a lock nut 80.

The bearing housing 20 is provided with a step 21. The bearing assembly 30 includes a front bearing 31, a spacer assembly, and a rear bearing 34. The spacer assembly is located between the front bearing 31 and the rear bearing 34. The spacer assembly comprises an outer spacer 32 and an inner spacer 33. The outer spacer 32 is sleeved on the inner spacer 33, and a gap is formed between the outer spacer 32 and the inner spacer 33.

When assembling the screw rod pretension adjusting mechanism of the gantry machining center, the bearing seat 20 is fixed on the cross beam. The front bearing 31 and the rear bearing 34 are mounted to the bearing housing 20. A spacer assembly is located between the front bearing 31 and the rear bearing 34 to space the front bearing 31 from the rear bearing 34. The outer spacer 32 is sleeved on the inner spacer 33. The rear bearing 34 interferes with the stepped portion 21 of the bearing housing 20. The lead screw 10 extends into the front bearing 31 and the rear bearing 34, and the front bearing 31 and the rear bearing 34 support the lead screw 10. The gland 40 presses the outer race of the front bearing 31. The spacer 50 abuts against the outer ring of the front bearing 31, and the elastic member 60 and the pressing plate 70 are mounted on the screw 10. The elastic member 60 has two ends respectively abutting against the spacer 50 and the pressing plate 70. A gap exists between the spacer 50 and the pressure plate 70. The lock nut 80 is fixed to the end of the lead screw 10.

The elastic member 60 is a disc spring. The butterfly spring is a spring with a relatively large force in the spring, and the magnitude of the force can be controlled by the size after compression. Therefore, when the screw rod 10 is prestretched, the force for prestretching the screw rod 10 can be known only by screwing the locking nut 80 to the proper size, and the operation is simple and convenient.

After the length and diameter of the threaded spindle 10, including the transmission, are determined, the required pretensioning force of the threaded spindle 10 is a function of the data. The rigidity of the elastic element 60 can be regarded as linear output within the ranges of 0-20%, 20-50% and 50-75% of the total deformation, the required deformation amount can be easily obtained, and the locking nut 80 is screwed to compress the disc spring to the required size, namely the required pre-tightening force can be achieved.

The locking nut 80 is screwed, the locking nut 80 transmits force to the pressure plate 70, the pressure plate 70 transmits force to the elastic element 60, the elastic element 60 transmits force to the spacer 50, the spacer 50 abuts against the front bearing 31, and the force is transmitted to the outer ring of the rear bearing 34 through the inner ring and the rolling body of the front bearing 31 and is transmitted to the bearing seat 20, so that the locking effect is realized.

Through the design, when the lead screw 10 needs to be stretched by large force, the thickness of prepressing can meet the requirement easily through calculating the force of the butterfly spring. The connection of the screw 10 and the bearing seat 20 is elastic, and the service life of the screw 10 is prolonged. When the lead screw 10 is in thermal extension, the disc spring can automatically eliminate the clearance with the bearing, and the transmission precision is improved.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, all according to the equivalent modifications and evolutions of the present invention, which are made to the above embodiments by the essential technology, and all belong to the protection scope of the present invention.

Claims

1. The utility model provides a longmen machining center lead screw pretension guiding mechanism, includes lead screw, bearing frame, bearing subassembly and lock nut, the bearing subassembly cover is located the lead screw, bearing subassembly and part the lead screw is located in the bearing frame, lock nut installs in the lead screw tip, its characterized in that: the screw rod pre-stretching adjusting mechanism of the gantry machining center further comprises a spacer bush, an elastic piece and a pressing plate, the spacer bush and the pressing plate are sleeved on the screw rod, the tail end of the pressing plate extends to a position between the spacer bush and the screw rod, the elastic piece is sleeved on the pressing plate and is not in contact with the screw rod, the spacer bush is abutted against the bearing assembly, the pressing plate is installed between the spacer bush and the locking nut, and two ends of the elastic piece are respectively abutted against the spacer bush and the pressing plate.

2. The screw rod pre-stretching adjusting mechanism of gantry machining center according to claim 1, characterized in that: the elastic piece is a disc spring.

3. The screw rod pre-stretching adjusting mechanism of gantry machining center according to claim 1, characterized in that: and a gap is formed between the pressing plate and the spacer bush.

4. The screw rod pre-stretching adjusting mechanism of gantry machining center according to claim 1, characterized in that: the locking nut is abutted against the pressing plate.

5. The screw rod pre-stretching adjusting mechanism of gantry machining center according to claim 1, characterized in that: the bearing assembly comprises a front bearing, a rear bearing and a spacer assembly, the front bearing, the rear bearing and the spacer assembly are sleeved on the lead screw, and the spacer assembly is located between the front bearing and the rear bearing.

6. The screw rod pre-stretching adjusting mechanism of gantry machining center according to claim 5, characterized in that: the spacer assembly comprises an outer spacer and an inner spacer, the outer spacer is sleeved on the inner spacer, and two ends of the outer spacer and two ends of the inner spacer are respectively abutted against the front bearing and the rear bearing.

7. The screw rod pre-stretching adjusting mechanism of gantry machining center according to claim 6, characterized in that: a gap exists between the outer spacer bush and the inner spacer bush.

8. The screw rod pre-stretching adjusting mechanism of gantry machining center according to claim 5, characterized in that: the screw rod pre-stretching adjusting mechanism of the gantry machining center further comprises a gland, wherein the gland is installed on the partition sleeve, and the end part of the gland is abutted against the bearing seat and the front bearing.