CN215545023U

CN215545023U - Clamping mechanism for lathe

Info

Publication number: CN215545023U
Application number: CN202121374182.0U
Authority: CN
Inventors: 罗朝威
Original assignee: Suzhou Tongyu Machine & Tool Co ltd
Current assignee: Suzhou Tongyu Machine & Tool Co ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-01-18
Anticipated expiration: 2031-06-21

Abstract

The utility model discloses a clamping mechanism for a lathe, which comprises: a main shaft; the pull rod is provided with a first inner cavity which is communicated with the two ends of the pull rod along the axis direction, and the pull rod is arranged in the main shaft in a penetrating way; a chuck connected to one end of the pull rod; the rotary oil cylinder is connected with the other end of the pull rod and is provided with a second inner cavity which is communicated with the two ends of the pull rod along the axis direction, and the second inner cavity is communicated with the first inner cavity; the mounting seat is connected to one side, away from the chuck, of the rotary oil cylinder; the locating rod is sequentially arranged in the second inner cavity and the first inner cavity in a penetrating mode, the locating rod is provided with a first end and a second end which are arranged oppositely, the first end is fixedly connected with the mounting seat, the second end is connected with a locating piece, and the locating piece is provided with a reference plane towards one side of the chuck. The scheme can improve the accuracy and the machining precision of the clamping position of the workpiece.

Description

Clamping mechanism for lathe

Technical Field

The utility model relates to the technical field of lathes, in particular to a clamping mechanism for a lathe.

Background

The lathe is a machine tool for turning a rotating workpiece mainly by a lathe tool, and the lathe can improve the production efficiency of small-batch workpieces, so that the lathe has wide application. A chuck is a part of a lathe for directly holding a workpiece (e.g., bar stock) and generally includes three parts, a chuck body, movable jaws, and a jaw driving mechanism. The center of the chuck body is provided with a through hole so as to pass through a workpiece or a bar material; the back of the chuck body is provided with a cylindrical or short conical structure so as to be connected with the end part of a spindle of the machine tool directly or through a flange. Chucks are commonly used in lathes, cylindrical grinders and internal grinders, and may also be used in conjunction with various indexing devices for milling and drilling machines.

The existing power chuck belongs to an automatic centering chuck, and a pneumatic chuck, a hydraulic chuck or an electric chuck can be formed by matching the automatic centering chuck with different power devices (cylinders, oil cylinders or motors). The air cylinder or the oil cylinder is arranged at the rear end of the main shaft of the machine tool, the wedge-shaped sleeve in the chuck body at the front end of the main shaft is pushed and pulled by a pull rod penetrating through a main shaft hole, and the 3 clamping jaws simultaneously and radially move to clamp or loosen a workpiece by the axial advance and retreat of the wedge-shaped sleeve. The chuck has rapid action and small jaw moving amount, and is suitable for mass production. Although the jaw exerts an acting force on the bar material along the radial direction, the bar material is inevitably subjected to the acting force in the axial direction exerted by the jaw in the clamping process, so that the bar material moves in the axial direction in the clamping process, and the position of the bar material is deviated after the bar material is clamped, and the machining precision is affected.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the embodiment of the utility model provides a clamping mechanism for a lathe, which is used for solving the problems.

The embodiment of the application discloses: a clamping mechanism for a lathe, comprising:

a main shaft;

the pull rod is provided with a first inner cavity which is communicated with two ends along the axis direction, and the pull rod is arranged in the main shaft in a penetrating way;

the chuck is connected to one end of the pull rod;

the rotary oil cylinder is connected with the other end of the pull rod, the rotary oil cylinder is provided with a second inner cavity which is communicated with the two ends of the pull rod along the axis direction, and the second inner cavity is communicated with the first inner cavity;

the mounting seat is connected to one side, away from the chuck, of the rotary oil cylinder;

the locating lever, it wears to establish in proper order in the second inner chamber with in the first inner chamber, the locating lever has relative first end and the second end that sets up, first end with mount pad fixed connection, the second end is connected with a setting element, the setting element orientation one side of chuck has a reference plane.

Specifically, the mounting seat has the third inner chamber that link up along axis direction both ends, the third inner chamber with the second inner chamber intercommunication, the first end of locating lever is worn out outside the third inner chamber and through the nut with the mounting seat is connected.

Specifically, the setting element includes first portion and the second portion that meets, first portion is used for the cover to be established the second of locating lever is served, the second portion be used for with first inner chamber sliding connection, the reference plane sets up on the second portion.

In particular, the diameter of the first portion is smaller than the diameter of the second portion.

Specifically, be equipped with the slot on the outer wall of second portion, be equipped with the sealing washer on the slot.

Specifically, the first portion is detachably connected to the positioning rod.

Specifically, the clamping mechanism for the lathe further comprises a water drainage box arranged between the rotary oil cylinder and the mounting seat, and the water drainage box is provided with a fourth inner cavity communicated with the second inner cavity.

The utility model has at least the following beneficial effects:

1. in the process of clamping the workpiece, the reference plane of the positioning piece can play roles in positioning and limiting the end part of the workpiece, the workpiece is prevented from moving along the axial direction in the clamping process of the clamping jaw, and the accuracy and the machining precision of the clamping position of the workpiece are ensured.

2. In this embodiment, the connection position of locating lever and mount pad is adjustable, consequently, the axial distance of the reference plane of setting element and chuck on the locating lever is adjustable to make the fixture for lathe of this embodiment can satisfy the location demand of different work pieces.

In order to make the aforementioned and other objects, features and advantages of the utility model comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a clamping mechanism for a lathe according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural diagram of the positioning element in this embodiment.

Reference numerals of the above figures: 1. a main shaft; 2. a pull rod; 3. a chuck; 31. a chuck body; 32. a claw; 4. rotating the oil cylinder; 5. a mounting seat; 6. positioning a rod; 61. a first end; 62. a second end; 7. a positioning member; 71. a first part; 72. a second section; 721. a trench; 8. a drain box; 9. a nut; 10. and (5) a workpiece.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and 2, the clamping mechanism for a lathe of the present embodiment includes: the device comprises a main shaft 1, a pull rod 2, a chuck 3, a rotary oil cylinder 4, a mounting seat 5, a positioning rod 6 and a positioning piece 7.

Wherein, the outer wall of the main shaft 1 can be sleeved with a transmission gear to be connected with a transmission mechanism; the pull rod 2 is arranged in the main shaft 1 in a penetrating mode, the pull rod 2 is provided with a first inner cavity which is communicated with two ends of the pull rod 2 along the axial direction, in other words, the pull rod 2 is provided with a first inner cavity which is arranged along the axial direction of the pull rod 2 and is communicated with two ends of the pull rod 2; the chuck 3 is connected to one end of the pull rod 2, specifically, the chuck 3 is a chuck 3 in the prior art, and includes a chuck main body 31 connected to the spindle 1, a wedge sleeve (not shown in the figure) disposed inside the chuck main body 31 and connected to the pull rod 2, and a plurality of jaws 32 respectively connected to the chuck main body 31 and the wedge sleeve, wherein when the pull rod 2 moves along the axial direction, the jaws 32 can clamp or loosen the workpiece 10 under the driving of the wedge sleeve; a piston rod of the rotary oil cylinder 4 is connected with the other end of the pull rod 2, the rotary oil cylinder 4 can drive the pull rod 2 to move along the axial direction, the rotary oil cylinder 4 is provided with a second inner cavity which is communicated with the first inner cavity along the two ends of the axial direction,

preferably, the second lumen is disposed coaxially with the first lumen. The mounting seat 5 is connected to one side of the rotary oil cylinder 4, which is far away from the chuck 3, and is used for mounting a positioning rod 6; locating lever 6 wears to establish in second inner chamber and first inner chamber in proper order, and locating lever 6 has relative first end 61 and the second end 62 that sets up, first end 61 and mount pad 5 fixed connection, and second end 62 is connected with a setting element 7, and this setting element 7 has a reference plane towards one side of chuck 3.

By means of the scheme, the working principle of the clamping mechanism for the lathe is as follows: pull rod 2 can be along axial motion under the drive of rotary cylinder 4, locating lever 6 is fixed unable axial motion of following behind mount pad 5, when the fixture centre gripping work piece 10 that is used for the lathe that adopts this embodiment, rotary cylinder 4 drives pull rod 2 along the direction motion that deviates from chuck 3, the wedge cover is along with pull rod 2 motion so that jack catch 32 opens, afterwards, stretch into work piece 10 in chuck 3's the through-hole until work piece 10's tip butt to on the reference plane of setting element 7 and keep work piece 10 and setting element 7 to offset, then, rotary cylinder 4 drives pull rod 2 along the direction motion towards chuck 3, the wedge cover is along with pull rod 2 motion so that jack catch 32 is closed with centre gripping work piece 10. Thus, the workpiece 10 can be ensured not to move along the axial direction in the clamping process of the clamping jaws, and the precision and the machining precision of the clamping position of the workpiece 10 are ensured.

Specifically, as shown in fig. 1, the mounting seat 5 of the present embodiment has a third inner cavity penetrating through two ends in the axial direction, the third inner cavity is communicated with the second inner cavity, preferably, the third inner cavity and the second inner cavity are coaxially arranged, and the first end 61 of the positioning rod 6 penetrates out of the third inner cavity and is connected to the mounting seat 5 through a nut 9. More specifically, first end 61 of locating lever 6 can be equipped with external screw thread structure, and it passes the third inner chamber in order to set up in the one side that mount pad 5 deviates from rotary cylinder 4, and first end 61 of locating lever 6 is fixed on mount pad 5 through the mode that adopts threaded connection with nut 9. In this way, the relative position between the second end 62 of the positioning rod 6 and the chuck 3 along the axial direction is adjustable, that is, the relative position between the reference plane of the positioning member 7 and the chuck 3 is adjustable, so as to meet the positioning requirements of different workpieces 10 and improve the applicability of the clamping mechanism for the lathe of the present embodiment.

Specifically, as shown in fig. 2 and 3, the positioning member 7 of the present embodiment includes a first portion 71 and a second portion 72 that meet. The first portion 71 is configured to be sleeved on the second end 62 of the positioning rod 6, the second portion 72 is configured to be slidably connected with the first inner cavity of the pull rod 2, and the reference plane is disposed on the second portion 72. Further, the first portion 71 and the second portion 72 may be cylindrical, and the diameter of the first portion 71 is smaller than that of the second portion 72, so that the friction area between the positioning member 7 and the positioning rod 6 can be reduced. Preferably, the first portion 71 is detachably connected to the positioning rod 6, for example, the first portion 71 may be connected to the positioning rod 6 by a screw, so that the positioning member 7 can be easily replaced when the reference plane is worn.

Specifically, as shown in fig. 3, a groove 721 is formed on an outer wall of the second portion 72 of the positioning member 7 of the present embodiment, the groove 721 can be used to install a waterproof sealing ring, and the sealing ring can reduce the amount of the working fluid flowing into the first inner cavity of the pull rod 2 at the chuck 3.

Specifically, as shown in fig. 1, the clamping mechanism for a lathe of the present embodiment further includes a water drainage box 8 disposed between the rotary cylinder 4 and the mounting seat 5, the water drainage box 8 has a fourth inner cavity, the fourth inner cavity is communicated with the second inner cavity of the rotary cylinder 4, and the fourth inner cavity can also be communicated with the third inner cavity of the mounting seat 5, so that the positioning rod 6 passes through several inner cavities. Preferably, the bottom of the fourth inner cavity is lower than the bottoms of the second inner cavity and the third inner cavity, so that the working fluid flowing into the second inner cavity from the first inner cavity can be easily discharged, the working fluid is prevented from being accumulated in the second inner cavity and the first inner cavity, and the working fluid is also prevented from entering the third inner cavity of the mounting base 5.

In summary, the clamping mechanism for a lathe of the present embodiment has the following advantages:

1. in the process of clamping the workpiece 10, the reference plane of the positioning element 7 of the embodiment can play a role in positioning and limiting the end of the workpiece 10, so that the workpiece 10 is prevented from moving along the axial direction in the clamping process of the clamping jaw, and the accuracy and the machining precision of the clamping position of the workpiece 10 are ensured.

2. In this embodiment, the connecting position between the positioning rod 6 and the mounting seat 5 is adjustable, so that the axial distance between the reference plane of the positioning member 7 on the positioning rod 6 and the chuck 3 is adjustable, and the clamping mechanism for a lathe in this embodiment can meet the positioning requirements of different workpieces 10.

The principle and the implementation mode of the utility model are explained by applying specific embodiments in the utility model, and the description of the embodiments is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A clamping mechanism for a lathe, comprising:

a main shaft;

the chuck is connected to one end of the pull rod;

2. The clamping mechanism for the lathe according to claim 1, wherein the mounting base has a third inner cavity penetrating through both ends in the axial direction, the third inner cavity is communicated with the second inner cavity, and the first end of the positioning rod penetrates out of the third inner cavity and is connected with the mounting base through a nut.

3. The clamping mechanism for a lathe of claim 1, wherein the positioning member comprises a first portion and a second portion connected with each other, the first portion is configured to be sleeved on the second end of the positioning rod, the second portion is configured to be slidably connected with the first inner cavity, and the reference plane is disposed on the second portion.

4. The clamping mechanism for a lathe of claim 3, wherein the diameter of the first portion is smaller than the diameter of the second portion.

5. The clamping mechanism for a lathe as set forth in claim 3, wherein a groove is provided on an outer wall of the second portion, and a seal ring is provided on the groove.

6. The clamping mechanism for a lathe of claim 3, wherein the first portion is detachably connected to the positioning rod.

7. The clamping mechanism for a lathe of claim 1, further comprising a drain box disposed between the rotary cylinder and the mounting block, the drain box having a fourth internal cavity in communication with the second internal cavity.