CN112318153A

CN112318153A - Lengthened roller type lathe center frame

Info

Publication number: CN112318153A
Application number: CN202011498343.7A
Authority: CN
Inventors: 李龙江
Original assignee: NINGBO CITY JINGHENG KAIXIANG MACHINERY CO LTD
Current assignee: NINGBO CITY JINGHENG KAIXIANG MACHINERY CO LTD
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-02-05

Abstract

The invention discloses a lengthened roller type lathe center frame, which comprises a center arm arranged in a mounting seat and two support arms hinged on the mounting seat, wherein the front ends of the center arm and the support arms are respectively provided with a roller; the rollers are lengthened rollers, lengthened roller supports are arranged at the front ends of the central arm and the support arm, and the lengthened rollers are arranged in the lengthened roller supports; the central arm is a cylinder body of an oil cylinder hidden in the mounting seat, a safety valve is mounted on the rear end face of the mounting seat, and a piston rod of the oil cylinder is connected with the safety valve; the two support arms are symmetrically arranged, the pressure bearing wheels are installed at the rear ends of the support arms, wedge-shaped plates are installed on the upper side surface and the lower side surface of the central arm, thrust inclined planes in rolling contact with the pressure bearing wheels are formed on the wedge-shaped plates, the central arm moves forwards under the action of hydraulic pressure, meanwhile, the thrust inclined planes push the pressure bearing wheels to drive the two support arms to move synchronously to close, a workpiece is controlled in a circle formed by the support points of the three rollers, and the wedge-shaped plates are provided with returning plates for pulling the support arms to open.

Description

Lengthened roller type lathe center frame

Technical Field

The invention relates to the technical field of machining equipment, in particular to a center frame applied to a lathe, and specifically relates to a center frame of a lengthened roller type lathe.

Background

The center frame is an auxiliary supporting device used in the turning or grinding process of slender shaft parts, so that the high-precision processing of parts such as superfine optical shafts, precision lead screws, ball screws and the like becomes possible. In the prior art, a support wheel for supporting a workpiece on a lathe center frame is generally a short roller, and the roller is similar to a point support, so that the center adjustment of the workpiece clamped by a long shaft is troublesome. Moreover, because the traditional center frame has large external dimension and relatively small clamping range, the center frame is difficult to be installed on a machine tool with small space and large clamping range requirement.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a lengthened roller type lathe center frame which adopts a built-in oil cylinder design, has small volume, large clamping range, long supporting rollers and high center positioning accuracy.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a lengthened roller type lathe center frame comprises a center arm and two support arms, wherein the center arm is arranged at the center position in a mounting seat in a front-back sliding mode, the two support arms are hinged to the mounting seat in a lever mode, and rollers used for being matched with a workpiece in a rolling supporting mode are respectively arranged at the front ends of the center arm and the two support arms; the roller is a cylindrical lengthened roller, the front ends of the central arm and the two support arms are respectively provided with a lengthened roller support, and the lengthened roller is rotatably arranged in the lengthened roller support through a roller shaft which axially penetrates through a central shaft hole of the lengthened roller; the central arm is a cylinder body of an oil cylinder hidden in the mounting seat, a manual-automatic integrated safety valve is fixedly mounted on the rear end face of the mounting seat, and a piston rod of the oil cylinder is connected with a safety valve fixing support; two support arms use the central axis of central arm to set up for symmetry axis longitudinal symmetry to the rear end of two support arms is all installed with rotating and is held the pinch roller, the wedge plate is installed symmetrically to the upper and lower both sides of central arm, the wedge plate shaping have with the support arm on hold pinch roller rolling contact's thrust inclined plane, central arm when advancing under hydraulic pressure the thrust inclined plane of wedge plate push away to hold the pinch roller synchronous motion fold with work piece control in the circle of the strong point formation of three gyro wheel, install on the wedge plate and be used for pulling the support arm when central arm retreats and open the regression board that resets.

In order to optimize the technical scheme, the specific measures adopted further comprise:

the mounting seat comprises a main seat body formed with a mounting cavity and a cover plate covered with the main seat body; the rear end of the main seat body is provided with a notch through which a piston rod can pass, the safety valve is fixedly arranged on the rear end face of the main seat body through four bolts, the oil cylinder is arranged in the mounting cavity of the main seat body, and the center of the front end face of the main seat body is provided with a guide sliding opening which is in sliding guide fit with the peripheral face of the central arm.

The support arm is rotatably provided with a rotating shaft serving as a fulcrum of the lever in a penetrating manner, the front surface of the main seat body and the front surface of the cover plate are both provided with a support lug in a protruding manner for erecting a support rotating shaft, and the support lug is provided with a rotating shaft hole which is in penetrating fit with the end part of the rotating shaft; the pressure bearing wheel is rotatably arranged at the rear end of the support arm through a pressure bearing wheel shaft.

The return plate is fixedly arranged on the wedge-shaped plate through an inner six-screw, an inclined long chute which is consistent with the inclined angle of the thrust inclined plane is processed on the return plate, and a sliding column which is in sliding fit with the inclined long chute is arranged at the rear end of the support arm.

The front end of the support arm is provided with an adjusting seat used for adjusting the angle of the lengthened roller support through adjusting screws, and the rear end face of the lengthened roller support arranged on the support arm is provided with an assembly cavity used for being fixedly sleeved and installed with the adjusting seat.

The front surface of the central arm is fixedly provided with a support fixing frame through an adjusting screw, the support fixing frame is formed with a clamping groove, and the lengthened roller support arranged on the central arm is positioned and clamped in the clamping groove of the support fixing frame.

The central arm and the two support arms are positioned in the same longitudinal plane, and the three rollers are circumferentially distributed at 120 degrees on a circle formed by the support points of the rollers.

The cross section of the central arm is square or rectangular, and a limiting block used for limiting the maximum opening angle of the support arm (3) is formed in the mounting cavity of the main base body.

Compared with the prior art, the roller is a cylindrical lengthened roller, the lengthened roller can increase the contact area with a workpiece, and therefore the machining precision of the workpiece is improved. Under the same condition, compared with the mechanical three-jaw transfer center frame commonly adopted on the current lathe, the invention can greatly save the time for loading and unloading the workpiece and can reduce the trouble for adjusting the center of the workpiece. The invention adopts the design of the built-in oil cylinder, reduces the external dimension of the center frame, enlarges the clamping range, and has high reliability and usability.

Drawings

FIG. 1 is a front view of the present invention (the dotted line in the figure indicates a circle made up of support points of three support wheels);

FIG. 2 is a top view of FIG. 1;

FIG. 3 is an exploded view of the present invention;

FIG. 4 is a schematic view of an assembly structure of the supporting arm and the main base according to the present invention;

FIG. 5 is a schematic view of the mounting structure of the oil cylinder and the safety valve according to the present invention;

FIG. 6 is a schematic perspective view of a regression plate according to the present invention;

FIG. 7 is a schematic view of the present invention with the center arm retracted and the support arm extended;

FIG. 8 is a schematic view of the present invention with the center arm advanced and the arms closed.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 8 are schematic views of construction and wall piles according to the present invention.

Wherein the reference numerals are: the device comprises a regression plate H, an inclined long chute H1, a bolt L, an installation seat 1, an installation cavity 1a, a notch 1b, a guide sliding opening 1c, a main seat body 11, a cover plate 12, a support lug 13, a rotating shaft hole 13a, a limiting block 14, an oil cylinder 2, a central arm 21, a support arm 3, a rotating shaft 31, a pressure-bearing wheel 32, a pressure-bearing wheel shaft 33, a roller 4, a lengthened roller 41, a lengthened roller support 5, an assembly cavity 5a, a safety valve 6, a wedge-shaped plate 7, a thrust inclined plane 7a, a support fixing frame 8 and an adjusting seat 9.

As shown in fig. 1 to 8, the invention provides an elongated roller type lathe center frame which adopts hydraulic power and comprises a mounting base 1 of a flat rectangular body, a center arm 21 arranged at the center position in the mounting base 1 and two support arms 3 hinged on the mounting base 1 in a lever type. The central arm 21 is a cylinder body of the oil cylinder 2 hidden in the mounting seat 1, the supporting point of the oil cylinder 2 is a manual-automatic integrated safety valve 6 fixedly mounted on the rear end face of the mounting seat 1, the safety valve 6 is provided with an oil inlet and an oil return port of the oil cylinder 2, and a piston rod of the oil cylinder 2 penetrates through the rear end face of the mounting seat 1 and is fixedly connected with a safety valve 6 support. The front ends of the central arm 21 and the two support arms 3 are respectively provided with a roller 4 which is used for rolling and supporting and matching with a workpiece, the roller 4 is a cylindrical lengthening roller 41, the front ends of the central arm 21 and the two support arms 3 are respectively provided with a lengthening roller support 5, and the lengthening roller 41 is rotatably arranged in the lengthening roller support 5 through a roller shaft which axially passes through a central shaft hole of the lengthening roller 41.

The two support arms 3 of the present invention are arranged up and down symmetrically by using the central axis of the central arm 21 as the symmetry axis, that is, the central arm 21 and the two support arms 3 are in the same longitudinal plane and are distributed up, middle and down. The parts of the two support arms 3 outside the mounting base 1 are arc-shaped, so that the two support arms 3 and the three rollers 4 on the central arm 21 are distributed in a circle formed by the support points for the workpiece at 120 degrees in the circumferential direction. The rear ends of the two support arms 3 in the mounting base 1 are both rotatably provided with pressure-bearing wheels 32, and the pressure-bearing wheels 32 are used for bearing the torque applied to the support arms 3. As can be seen from fig. 5 of the present invention, the wedge-shaped plates 7 are symmetrically installed on the upper and lower side surfaces of the central arm 21, and the wedge-shaped plates 7 are formed with thrust inclined planes 7a which are in rolling contact with the pressure-bearing wheels 32 on the support arms 3, so that under the control of the hydraulic system, when the central arm 21 extends forward, the wedge-shaped plates 7 can be synchronously driven to move forward, and the wedge-shaped plates 7 can push the pressure-bearing wheels 31 through the thrust inclined planes 7a, thereby driving the two support arms 3 to move synchronously to enable the three rollers 4 to be in a closed state, controlling the workpiece in a circle formed by the support points of the three rollers 4, and realizing the self-centering adjustment of the central frame (as shown in fig.. The center of the circle formed by the three rollers 4 falls on the central axis of the central arm 21. The invention also installs a returning plate H (shown in figure 7) on the wedge-shaped plate 7 for pulling the support arm 3 to open and reset when the central arm 21 retreats.

The invention adopts a hydraulic oil cylinder to push the central arm in the middle and simultaneously drive the three rollers 4 to move. Under the same condition, compared with the mechanical three-jaw transfer center frame commonly adopted on the current lathe, the time for loading and unloading the workpiece can be greatly saved, and the trouble for adjusting the center of the workpiece can be reduced. The center frame adopts the design of the built-in oil cylinder, reduces the appearance size of the center frame, enlarges the clamping range and is suitable for a machine tool with small installation space and large clamping range.

As shown in fig. 1, the mounting seat 1 includes a main seat body 11 and a cover plate 12 covering the main seat body 11. The main base body 11 is formed with a mounting cavity 1a for mounting various parts, for example, the oil cylinder 2, the wedge plate 7 and the return plate H are all located in the mounting cavity 1 a. As can be seen from fig. 5, the rear end of the main seat body 1 of the present invention is provided with a notch 1b so as to enable the piston rod to pass through and be fixedly connected with the safety valve 6. The safety valve 6 is fixedly arranged on the rear end face of the main seat body 11 by four bolts L penetrating through mounting holes on the safety valve. The oil cylinder 2 is arranged in the mounting cavity 1a of the main base body 11, and in order to ensure the stability of the forward and backward movement of the central arm 21, a guide sliding opening 1c matched with the peripheral surface of the central arm 21 in a sliding and guiding manner is formed in the center of the front end surface of the main base body 11.

In the embodiment of the present invention, the rotating shaft 31 is rotatably inserted into the arm 3, and the rotating shaft 31 serves as a fulcrum of the arm 3, so that the arm 3 can rotate around the axis of the rotating shaft 31. The front surface of the main seat body 11 and the front surface of the cover plate 12 are both formed with support lugs 13 for supporting the rotating shaft 31, the support lugs 13 are in a forward protruding arc structure, and the support lugs 13 are provided with rotating shaft holes 13a which are in penetrating fit with the end parts of the rotating shaft 31. A pressure wheel 32 of the present invention is rotatably mounted to the rear end of the arm 3 via a pressure wheel shaft 33.

In the embodiment, the returning plate H is fixedly mounted on the wedge plate 7 through an inner six-screw, an inclined long chute H1 corresponding to the inclined angle of the thrust inclined surface 7a is formed on the returning plate (H), and a sliding column in sliding fit with the inclined long chute H1 is mounted at the rear end of the support arm 3. The sliding column is not shown in the figures of the invention, but the invention can also be provided with a tension spring structure, and the support arm 3 is pulled back to the return position after the support arm 3 loses the pressure of the lever by utilizing the spring force of the tension spring.

The front end of the support arm 3 of the invention is provided with an adjusting seat 9 through an adjusting screw, the structure of a lengthened roller support 5 arranged on the support arm 3 is slightly different from that of the lengthened roller support 5 arranged on the central arm 21, an assembly cavity 5a is formed on the back surface of the lengthened roller support 5 arranged on the support arm 3 so as to be fixedly sleeved and arranged with the adjusting seat 9, the angle of the lengthened roller support 5 arranged on the support arm 3 can be properly adjusted by the adjusting seat 9, thereby changing the angle of the lengthened roller support 5, achieving the purpose of adjusting the angle of the roller 4 and ensuring that the roller 4 can completely support a workpiece.

In the embodiment of the invention, the front surface of the central arm 21 is fixedly provided with the support fixing frame 8 through the adjusting screw, the support fixing frame 8 is formed with a clamping groove, and the lengthened roller support 5 arranged on the central arm 21 is positioned and clamped in the clamping groove of the support fixing frame 8.

The cross section of the central arm 21 is square or rectangular, and a limiting block 14 for limiting the maximum opening angle of the support arm 3 is formed in the mounting cavity 1a of the main base body 11.

The invention can automatically adjust the center position of the workpiece according to the conditions of excircle of the workpiece or axial swing of a rotating shaft and the like in the rotating process of the workpiece, prevent additional deformation and oscillation of the whole system caused by additional deformation caused by interaction between internal forces caused by rigid support, and ensure constant support force, thereby ensuring more stable support.

The working principle of the invention is as follows: under the action of hydraulic pressure, the central arm 21 of the oil cylinder 2 drives the two wedge-shaped plates 7 to move back and forth, so that the central arm 21 simultaneously drives the upper support arm and the lower support arm 3 to move synchronously, and a workpiece is always controlled in a circle formed by the support points of the three rollers 4.

When the center frame does not work, the center frame is in a state of not contacting with the workpiece (as the case may be), the oil cylinder 2 is in an oil discharge state at the time, and the two support arms 3 are controlled to be in a retraction state by the return plate H. When the center frame is required to work (a workpiece is clamped on a machine tool), the oil cylinder 2 is filled with oil into a rodless cavity of the oil cylinder 2 by a hydraulic system, and the center arm 21 extends out to enable the roller 4 of the center frame to move to a part of the workpiece to be supported. The rollers 4 on the upper and lower support arms 3 support the shaft workpiece to be processed, and the roller 4 on the central arm in the middle supports the workpiece to prevent the workpiece from moving transversely. When the process is carried out, as the diameter of the workpiece is continuously reduced, the angle between the rollers 4 on the two support arms 3 is also reduced, and the roller 4 on the central arm moves forwards and always supports against the workpiece.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the invention.

Claims

1. A lengthened roller type lathe center frame comprises a center arm (21) which is arranged at the center position in a mounting seat (1) in a front-back sliding mode and two support arms (3) which are hinged to the mounting seat (1) in a lever mode, wherein the front ends of the center arm (21) and the two support arms (3) are respectively provided with a roller (4) which is used for being matched with a workpiece in a rolling supporting mode; the method is characterized in that: the roller is a cylindrical lengthening roller (41), the front ends of the central arm (21) and the two support arms (3) are respectively provided with a lengthening roller support (5), and the lengthening roller (41) is rotatably arranged in the lengthening roller support (5) through a roller shaft which axially penetrates through a central shaft hole of the lengthening roller (41); the central arm (21) is a cylinder body of an oil cylinder (2) hidden in the mounting seat (1), a manual-automatic integrated safety valve (6) is fixedly mounted on the rear end face of the mounting seat (1), and a piston rod of the oil cylinder (2) is fixedly connected with a fixed support of the safety valve (6); two central axis that support arm (3) used central arm (21) set up for symmetry axis longitudinal symmetry to the rear end of two support arms (3) all installs pressure-bearing wheel (32) with rotating, wedge (7) are installed symmetrically to the upper and lower both sides of central arm (21), wedge (7) shaping have with support arm (3) on pressure-bearing wheel (32) rolling contact's thrust inclined plane (7a), central arm (21) when advancing under hydraulic pressure the thrust inclined plane (7a) extrusion pressure-bearing wheel (31) drive two support arms (3) synchronous motion fold the work piece control in the circle of the strong point formation of three gyro wheel (4), wedge (7) on install and be used for pulling support arm (3) when central arm (21) retreat and open the board (H) that returns that resets.

2. The center frame of an elongated roller type lathe according to claim 1, wherein: the mounting seat (1) comprises a main seat body (11) formed with a mounting cavity (1a) and a cover plate (12) covered with the main seat body (11); the rear end of the main seat body (1) is provided with a notch (1b) through which a piston rod can pass, the safety valve (6) is fixedly arranged on the rear end face of the main seat body (11) through four bolts (L), the oil cylinder (2) is arranged in an installation cavity (1a) of the main seat body (11), and the center of the front end face of the main seat body (11) is provided with a guide sliding opening (1c) which is in sliding guide fit with the peripheral face of the central arm (21).

3. The center frame of an elongated roller type lathe according to claim 2, wherein: a rotating shaft (31) serving as a lever fulcrum is rotatably arranged on the support arm (3) in a penetrating manner, supporting lugs (13) for erecting the supporting rotating shaft (31) are formed in a protruding manner in the front of the main base body (11) and the front of the cover plate (12), and rotating shaft holes (13a) which are in penetrating fit with the end parts of the rotating shaft (31) are formed in the supporting lugs (13); the pressure bearing wheel (32) is rotatably arranged at the rear end of the support arm through a pressure bearing wheel shaft (33).

4. The center frame of an elongated roller type lathe according to claim 3, wherein: the device is characterized in that the regression plate (H) is fixedly arranged on the wedge-shaped plate (7) through an inner six-screw rod, an inclined long sliding groove (H1) which is consistent with the inclined angle of the thrust inclined plane (7a) is processed on the regression plate (H), and a sliding column which is in sliding fit with the inclined long sliding groove (H1) is arranged at the rear end of the support arm (3).

5. The center frame of an elongated roller type lathe according to claim 4, wherein: the front end of support arm (3) install through adjusting screw and be used for reaching regulation roller (4) angle purpose's regulation seat (9) through the installation angle who adjusts extension roller support (5), install the rear end face shaping of extension roller support (5) on support arm (3) has assembly chamber (5a) that are used for with regulation seat (9) fixed suit installation.

6. The center frame of an elongated roller type lathe according to claim 5, wherein: the front of the central arm (21) is fixedly provided with a support fixing frame (8) through an adjusting screw, the support fixing frame (8) is formed with a clamping groove, and the lengthened roller support (5) arranged on the central arm (21) is positioned and clamped in the clamping groove of the support fixing frame (8).

7. The center frame of an elongated roller type lathe according to claim 6, wherein: the central arm (21) and the two support arms (3) are positioned in the same longitudinal plane, and the three rollers (4) are circumferentially distributed at an angle of 120 degrees on a circle formed by the support points of the rollers.

8. The center frame of an elongated roller type lathe according to claim 7, wherein: the cross section of the central arm (21) is square or rectangular, and a limiting block (14) used for limiting the maximum opening angle of the support arm (3) is formed in the mounting cavity (1a) of the main base body (11).