CN114619060A

CN114619060A - Thimble type slidable auxiliary centering device

Info

Publication number: CN114619060A
Application number: CN202111567080.5A
Authority: CN
Inventors: 王朝琴; 罗程宇; 王小荣; 何鹏; 罗冠炜
Original assignee: Lanzhou Jiaotong University
Current assignee: Lanzhou Jiaotong University
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-06-14

Abstract

A thimble type slidable auxiliary centering device relates to a mechanism, in particular to a thimble type slidable auxiliary centering device. The invention aims to solve the problem of low processing efficiency caused by an eccentric phenomenon due to overlarge diameter and uneven end surface of a blank in the clamping process. The mechanism comprises a fixed sleeve, a locking disc, a clamping jaw, an adjusting bolt, a driving gear, an end cover, an inner hexagon bolt, a sliding guide groove, a retaining ring, a thimble body, a deep groove ball bearing, a cylindrical roller bearing, a bearing end cover and a spring pin. The ejector pin type slidable auxiliary centering device needs to be designed and researched, so that the centering of the blank can be efficiently and quickly carried out when the blank is clamped, and the blank is convenient to process. The invention can obtain the ejector pin type slidable auxiliary centering device.

Description

Thimble type slidable auxiliary centering device

Technical Field

The invention relates to a cylindrical clamping device, in particular to a thimble type slidable auxiliary centering device.

Background

In the machining process, a lathe is required to be frequently used for turning the workpiece such as an excircle and a plane, in order to guarantee machining precision and improve working efficiency, the workpiece needs to be accurately clamped, and therefore an efficient device needs to be designed to improve machining efficiency.

The clamp of operations such as cutting of present lathe only can carry out centre gripping fixed to the work piece, though can carry out certain clamping task, nevertheless can often appear eccentric phenomenon in the clamping in-process, need carry out operations such as supplementary clamp to the work piece, otherwise appear off-centre easily, cause the influence to processing. When the problem occurs, most of the clamping devices can only be used for clamping again to ensure that the eccentric center is avoided, but a large amount of time is consumed at the same time, so that the processing efficiency is seriously reduced. Therefore, the conventional centering device is limited. In order to solve the above problems, it is necessary to design a simple and easy ejector pin type slidable auxiliary centering device.

Disclosure of Invention

In view of the defects of the prior art, the invention improves the centering of the blank exceeding the problems of the diameter of the inner hole of the chuck, the uneven end surface and the like on the lathe, provides the ejector pin type slidable auxiliary centering device, can realize the original ejector pin function, and can also carry out auxiliary clamping by the ejector pin of the tailstock.

In order to achieve the novel purpose, the invention provides the following technical scheme:

a thimble type slidable auxiliary centering device is characterized by comprising an auxiliary centering mechanism with an adjustable slidable diameter and a thimble.

The slidable auxiliary centering mechanism with the adjustable diameter comprises a fixed sleeve, a locking disc, a clamping jaw, an adjusting bolt, a driving gear, a fixed sleeve end cover, an inner hexagon bolt, a sliding guide groove and a check ring; the thimble comprises a thimble body, a deep groove ball bearing, a cylindrical roller bearing, a bearing end cover and a spring pin; the thimble is placed in the tailstock sleeve through the tailstock sleeve; the auxiliary centering mechanism with the adjustable slidable diameter is placed on the ejector pin, slides with the sliding guide rail through the spring pin, and ensures coaxiality through the spring pin; the retainer ring is in interference fit with the fixed sleeve; the driving gear is fixedly connected with the adjusting bolt in a welding manner; the adjusting bolt is in clearance fit with the retainer ring; the locking disc is meshed with the adjusting bolt through a gear; the locking disc is in clearance fit with the fixed sleeve; the clamping jaw is connected with the locking disc through meshing of rectangular teeth; the sleeve end cover is connected with the front end of the fixed sleeve through a hexagon socket head cap bolt in order to ensure that the locking disc is tightly combined with the clamping jaw, and the clamping jaw is dustproof and the like; the thimble is provided with a threaded hole; the spring pin is in threaded connection with the ejector pin.

The thimble of the thimble type slidable auxiliary centering device comprises a thimble body, a spring pin, a thimble, a deep groove ball bearing, a cylindrical roller bearing, a sleeve and a bearing end cover; the deep groove ball bearing is in interference fit with the thimble body; the cylindrical roller bearing is in interference fit with the thimble body; the centre is in interference fit with the deep groove ball bearing and the cylindrical roller bearing; a sleeve is arranged between the cylindrical roller bearing and the deep groove ball bearing for positioning; the sleeve is in clearance fit with the thimble tip body; the bearing end cover is connected with the thimble body through threads; the spring pin is in threaded connection with the thimble body.

Optionally, the slidable adjustable diameter secondary centering mechanism is provided with a set of clamping grips to ensure secondary centering accuracy.

The slidable diameter-adjustable auxiliary centering mechanism is provided with a transmission device, and the transmission device comprises a locking disc, a locking bolt and a clamping jaw; one side of the disc body is provided with a spiral rectangular straight tooth which is used for being meshed with the clamping jaws to realize the opening and closing of the clamping jaws; a gear is arranged at the other end of the locking disc; the lower end of the locking bolt is fixedly connected with a driving gear, and the locking bolt is in meshing and locking connection through a gear; the clamping jaw is connected with the locking disc through rectangular spiral teeth; the locking bolt is rotated through the inner hexagonal wrench, so that the disc body is driven to rotate, and the clamping jaws are driven to open and close.

The auxiliary centering mechanism with the adjustable slidable diameter can realize definite front-back sliding through the two spring pins and the two sliding guide grooves. The fixed sleeve of the slidable diameter-adjustable centering and clamping mechanism is in clearance fit with the ejector pin.

The invention relates to a thimble type slidable auxiliary centering device, wherein when the thimble type slidable auxiliary centering device works, a fixed sleeve drives a slidable diameter-adjustable auxiliary centering mechanism to move in a sliding guide groove through a spring pin, and the fixed sleeve is rotated after the thimble reaches a limit position, so that the spring pin is clamped on a designed corresponding position, and the fixed sleeve is fixed, thereby ensuring the coaxiality, putting one end of a workpiece into a three-jaw chuck of a machine tool, pushing a tailstock to approach, putting the other end of the workpiece into the slidable diameter-adjustable centering clamping mechanism, carrying out primary clamping operation on the three-jaw chuck, and carrying out primary clamping operation on the rear end until both ends are in contact with clamping jaws, clamping the three-jaw chuck and fixing the workpiece; if the thimble is needed, only the fixed sleeve needs to slide on the rear end of the thimble, and the thimble can independently perform auxiliary centering at the moment.

The ejector pin type slidable auxiliary centering device is formed by a fixing sleeve, a locking disc, a clamping jaw, an adjusting bolt, a driving gear, an end cover, an inner hexagon bolt, a sliding guide groove, a retaining ring, an ejector pin body, an ejector tip body, a deep groove ball bearing, a cylindrical roller bearing, a bearing end cover and a spring pin. The coaxiality of the parts during clamping is guaranteed, the centering difficulty of the blank during clamping is greatly reduced, the clamping speed is increased, and the working efficiency is improved.

Drawings

Fig. 1 is an overall configuration view of a thimble type slidable auxiliary centering device.

Fig. 2 is a schematic view of a thimble-type slidable secondary centering device in full section.

Fig. 3 is a longitudinal cut-away full sectional view of a thimble-type slidable secondary centering device.

Fig. 4 is a schematic view of a fixing sleeve of the thimble-type slidable auxiliary centering device in full section.

FIG. 5 is a partial cross-sectional view of a spring pin on a thimble of a thimble-type slidable secondary centering device.

Detailed Description

The first specific implementation way is as follows: the embodiment of the invention relates to a thimble type slidable auxiliary centering device which comprises an auxiliary centering mechanism (1) with an adjustable slidable diameter, a thimble (2), a fixed sleeve (3), an adjusting bolt (4), a driving gear (5), a locking disc (6), a clamping jaw (7), a fixed sleeve end cover (8), an inner hexagon bolt (9), a check ring (10), a sliding guide groove (11), a deep groove ball bearing (12), a thimble (13), a cylindrical roller bearing (14), a sleeve (15), a bearing end cover (16), a thimble body (17) and a spring pin (18).

The auxiliary centering mechanism (1) with the adjustable slidable diameter comprises a fixed sleeve (3), a locking disc (6), a clamping jaw (7), an adjusting bolt (4), a driving gear (5), a fixed sleeve end cover (8), an inner hexagon bolt (9), a sliding guide groove (11) and a check ring (10); the locking disc (6) is placed in the fixed sleeve; the driving gear (5) is placed on the left side of the locking disc (6) and meshed with the locking disc (6) through a gear, and is positioned below the adjusting bolt (4); the clamping jaws (7) are placed on the right side of the locking disc (6) and are meshed through a spiral straight gear; the adjusting bolt (4) is fixedly connected with the driving gear (5); the adjusting bolt (4) is in clearance fit with the retainer ring (10); the retainer ring (10) is in interference fit with the fixed sleeve (3); the sliding guide groove (11) is arranged on the fixed sleeve (3);

the thimble (2) comprises a thimble body (17), a spring pin (18), a thimble (13), a deep groove ball bearing (12), a cylindrical roller bearing (14), a sleeve (15) and a bearing end cover (16); the deep groove ball bearing (12) is in interference fit with the ejector pin body (17); the cylindrical roller bearing (14) is in interference fit with the thimble body (17); the center (13) is in interference fit with the deep groove ball bearing (12) and the cylindrical roller bearing (14); a sleeve is arranged between the cylindrical roller bearing (14) and the deep groove ball bearing (12) for positioning; the sleeve (15) is in clearance fit with the tip (13); the bearing end cover (16) is connected with the thimble body (17) through threads; the center (13) is in clearance fit with the bearing end cover (16); the spring pin (18) is in threaded connection with the thimble body (17).

The second embodiment is as follows: the first difference between the present embodiment and the present embodiment is: the tail end of the sliding guide groove (11) is provided with a bending structure which can clamp the head of the main spring pin (18) so as to ensure the coaxiality of the auxiliary centering mechanism (1) with the adjustable sliding diameter during working. The rest is the same as the first embodiment.

The third concrete implementation mode: the difference between this embodiment and the first or second embodiment is: the head of the spring pin (18) is in clearance fit with the sliding guide groove (11) to ensure the smoothness of sliding. The others are the same as in the first or second embodiment.

The fourth concrete implementation mode: the present embodiment differs from the first to third embodiments in that: the locking disc (6) is in clearance fit with the fixed sleeve (3). The others are the same as the first to third embodiments.

The fifth concrete implementation mode: the present embodiment differs from the first to fourth embodiments in that: the adjusting bolt (4) is fixed by the retainer ring (10) in an auxiliary way; the retainer ring (10) is in interference fit with the fixed sleeve (3). The rest is the same as the first to fourth embodiments.

Claims

1. The utility model provides a supplementary centring means of thimble formula slidable which characterized in that: the device comprises a slidable auxiliary centering mechanism (1) with an adjustable diameter, an ejector pin (2), a fixed sleeve (3), an adjusting bolt (4), a driving gear (5), a locking disc (6), a clamping jaw (7), a fixed sleeve end cover (8), an inner hexagonal bolt (9), a check ring (10), a sliding guide groove (11), a deep groove ball bearing (12), an ejector tip (13), a cylindrical roller bearing (14), a sleeve (15), a bearing end cover (16), an ejector pin body (17) and a spring pin (18); the auxiliary centering mechanism (1) with the adjustable slidable diameter comprises a fixed sleeve (3), a locking disc (6), a clamping jaw (7), an adjusting bolt (4), a driving gear (5), a fixed sleeve end cover (8), an inner hexagon bolt (9), a sliding guide groove (11) and a check ring (10); the locking disc (6) is placed in the fixed sleeve; the driving gear (5) is placed on the left side of the locking disc (6) and meshed with the locking disc (6) through a gear and is positioned below the adjusting bolt (4); the clamping jaws (7) are placed on the right side of the locking disc (6) and are meshed through a spiral straight gear; the adjusting bolt (4) is fixedly connected with the driving gear (5); the adjusting bolt (4) is in clearance fit with the retainer ring (10); the retainer ring (10) is in interference fit with the fixed sleeve (3); the sliding guide groove (11) is arranged on the fixed sleeve (3); the thimble (2) comprises a thimble body (17), a spring pin (18), a thimble (13), a deep groove ball bearing (12), a cylindrical roller bearing (14), a sleeve (15) and a bearing end cover (16); the deep groove ball bearing (12) is in interference fit with the ejector pin body (17); the cylindrical roller bearing (14) is in interference fit with the thimble body (17); the tip (13) is in interference fit with the deep groove ball bearing (12) and the cylindrical roller bearing (14); a sleeve is arranged between the cylindrical roller bearing (14) and the deep groove ball bearing (12) for positioning; the sleeve (15) is in clearance fit with the tip (13); the bearing end cover (16) is connected with the thimble body (17) through threads; the center (13) is in clearance fit with the bearing end cover (16); the spring pin (18) is in threaded connection with the ejector pin body (17).

2. The ejector pin type slidable auxiliary centering device according to claim 1, wherein: the tail end of the sliding guide groove (11) is provided with a bending structure which can clamp the head of the main spring pin (18) to ensure that the coaxiality of the sliding diameter-adjustable auxiliary centering mechanism (1) part is ensured during working.

3. The ejector pin type slidable auxiliary centering device according to claim 1, wherein: the head of the spring pin (18) is in clearance fit with the sliding guide groove (11) to ensure the smoothness of sliding.

4. The ejector pin type slidable auxiliary centering device according to claim 1, wherein: the locking disc (6) is in clearance fit with the fixed sleeve (3).

5. The ejector pin type slidable auxiliary centering device according to claim 1, wherein: the adjusting bolt (4) is fixed by the retainer ring (10) in an auxiliary way; the retainer ring (10) is in interference fit with the fixed sleeve (3).