CN220347391U

CN220347391U - Screw tap fixture

Info

Publication number: CN220347391U
Application number: CN202321925435.8U
Authority: CN
Inventors: 陈正强; 黄飞
Original assignee: Yuhuan Yueyue Intelligent Equipment Co ltd
Current assignee: Yuhuan Yueyue Intelligent Equipment Co ltd
Priority date: 2023-07-21
Filing date: 2023-07-21
Publication date: 2024-01-16
Anticipated expiration: 2033-07-21

Abstract

The utility model provides a tap clamp, and belongs to the technical field of clamps. It solves the problem of insufficient reliability. The novel screw tap comprises a mounting sleeve, an action spring and a cylindrical clamping piece, wherein a connecting hole capable of being circumferentially fixed with the upper end of the screw tap is formed in the inner side of the mounting sleeve, the clamping piece is sleeved on the outer peripheral side of the mounting sleeve, a lock sleeve with the upper end fixed with the mounting sleeve is sleeved outside the clamping piece, the lower end of the clamping piece extends out of the lock sleeve, a plurality of clamping blocks which are circumferentially distributed and enclose into clamping holes are arranged on the inner side of the lower end of the clamping piece, the lower end of the action spring abuts against the upper end of the clamping piece, a first guide conical surface capable of moving along the inner side of the lower end of the lock sleeve and gathering the clamping blocks when the clamping piece moves downwards under the action of the action spring is arranged on the outer side of the lower end of the clamping piece, and a second guide conical surface capable of moving along the outer side of the lower end of the mounting sleeve and dispersing the clamping blocks are arranged on the inner side of the lower end of the clamping piece. It has the advantages of higher reliability, etc.

Description

Screw tap fixture

Technical Field

The utility model belongs to the technical field of clamps, and relates to a tap clamp.

Background

The screw cap is a common part, the internal thread on the screw cap is usually formed by tapping by adopting a screw tap, in order to avoid influencing the processing precision, the screw tap is directly separated from the screw tap clamp after being tapped by the screw tap, rather than reversing the screw tap to return to the original path, and therefore, the screw tap clamp is required to have the functions of automatically clamping the screw tap and automatically loosening the screw tap after the processing is finished. For example, a unidirectional clamping mechanism for a shaft of patent application No. 201320004014.1 comprises a spindle sleeve with a slit at the front end, a locking piece is arranged on the inner side of the front end of the spindle sleeve, the locking piece consists of a torus and a plurality of clamping strips connected to the torus, the torus is partially exposed out of the spindle sleeve, the clamping strips are positioned in the spindle sleeve, a spring is arranged between the locking piece and the spindle sleeve, and the slit is crossed on the end face of the spindle sleeve in a cross shape along the axial direction. When a workpiece shaft (such as a tap) to be clamped is inserted into the main shaft sleeve and continuously moves leftwards, the locking piece pushes the spring leftwards under the action of friction force, the slit at the front end of the main shaft sleeve is enlarged, when the workpiece shaft moves rightwards under the action of friction force, the locking piece also moves rightwards, the slit at the front end of the main shaft sleeve is reduced, and at the moment, the workpiece shaft can only enter leftwards, and is clamped rightwards more tightly, so that unidirectional clamping of the workpiece shaft is completed; if the workpiece shaft is to be loosened, the locking piece is pressed leftwards. That is, the one-way clamping mechanism of the shaft can realize automatic clamping and falling of the tap.

However, the unidirectional clamping mechanism of the shaft has the following defects: when the locking piece is pressed leftwards, the space for outward resetting of the locking piece is provided through the enlargement of the slit at the front end of the main shaft sleeve, so that the locking piece can reset under the action of self elastic force and release the workpiece shaft, the self elastic force of the locking piece is in fatigue limit, the elastic force of the locking piece is weakened after long-term use, the situation that the workpiece shaft cannot be normally reset is caused, and the problem of insufficient reliability exists.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a tap clamp which solves the problem of insufficient reliability.

The aim of the utility model can be achieved by the following technical scheme:

the utility model provides a screw tap anchor clamps, includes installation cover, action spring and is the clamping piece of tube-shape, the installation cover inboard be equipped with can form the fixed connecting hole of circumference with the screw tap upper end, its characterized in that, the clamping piece cover locate the periphery side of installation cover and the clamping piece overcoat be equipped with the lock sleeve that upper end and installation cover are fixed mutually, the lower extreme of clamping piece stretches out the lock sleeve and the lower tip inboard of clamping piece has a plurality of clamping pieces that distribute and enclose into the clamping hole along circumference, action spring's lower extreme supports and leans on the upper end of clamping piece, the clamping piece lower extreme outside is equipped with and can follow the inboard motion of lock sleeve lower tip and make the direction conical surface first that each clamping piece gathered together when the clamping piece receives action spring's effect down, the clamping piece lower extreme inboard is equipped with and can follow the outside motion of installation cover lower tip and make the direction conical surface second that each clamping piece disperseed when the clamping piece moves up.

The tap clamp is mainly used for an automatic tapping machine for tapping nuts, and when the tap clamp is used, the installation sleeve is installed and fixed at the end part of a tapping shaft of the automatic tapping machine. When the tap is required to be clamped, the clamping piece is pushed upwards (can be manually pushed), at the moment, the second guiding conical surface on the inner side of the lower end of the clamping piece moves along the outer side of the lower end of the mounting sleeve, so that the lower end of the clamping piece is stressed to be in an outward expansion state to enable the clamping blocks to be dispersed, and the upper end of the tap is inserted into the connecting hole on the inner side of the mounting sleeve through the clamping hole surrounded by the clamping blocks to form torque transmission. The acting force of pushing up the clamping piece is removed when the screw tap is held, the clamping piece can move downwards under the action of the acting spring, the second guide conical surface is separated from the lower end part of the mounting sleeve, and the second guide conical surface outside the lower end of the clamping piece moves along the inner side of the lower end part of the lock sleeve, so that the lower end part of the clamping piece is stressed to be in a contracted state, the clamping blocks are gathered inwards, the screw tap is clamped, and the screw tap can be prevented from falling or tilting in the tapping process. After the screw cap is tapped by the screw tap through the tapping shaft, the screw tap is driven by the tapping shaft to move downwards to the lower end part of the clamping piece to form contact with the upper side surface of the screw cap, the clamping piece can overcome the elasticity of the acting spring to move upwards again because the screw cap cannot move, so that the first guide conical surface can fail, and the clamping blocks on the clamping piece are outwards dispersed to loosen the screw tap under the action of the movement of the second guide conical surface along the lower end part of the mounting sleeve, so that the screw tap can automatically fall off.

The screw tap fixture is provided with the lock sleeve, the upper end of which is fixedly connected with the mounting sleeve, the outer side of the lower end of the clamping piece is provided with the first guide conical surface which can move along the inner side of the lower end part of the lock sleeve and gather all clamping blocks when the clamping piece moves downwards under the action of the acting spring, the inner side of the lower end of the clamping piece is provided with the second guide conical surface which can move along the outer side of the lower end part of the mounting sleeve and disperse all the clamping blocks when the clamping piece moves upwards, so that the screw tap is clamped or loosened by not completely depending on the self elasticity of the clamping piece, and the reliability of use is well improved.

In the tap fixture, the outer side of the lower end part of the mounting sleeve is provided with the second action conical surface, the size reduction direction of the second action conical surface is the same as that of the second guide conical surface, and the second guide conical surface can move along the second action conical surface when the clamping piece moves upwards.

When the clamping piece moves upwards, the second guide conical surface can be propped against the second action conical surface and can move along the second action conical surface in the subsequent upward movement process of the clamping piece, and the mounting sleeve is fixed, so that an outwards expanding acting force can be formed on the lower end of the clamping piece, and the clamping blocks can be automatically dispersed to loosen the tap.

In the tap fixture, the inner side of the lower end of the lock sleeve is provided with the first action conical surface, the size reduction direction of the first action conical surface is the same as that of the first guide conical surface, the first guide conical surface can move along the first action conical surface when the clamping piece moves downwards under the action of the elastic force of the action spring, and a gap is reserved between the second guide conical surface and the second action conical surface when the first guide conical surface abuts against the first action conical surface.

When the clamping piece moves downwards under the action of the elastic force of the action spring, the guide conical surface abuts against the action conical surface II at a moment and the guide conical surface II moves along the action conical surface II in the subsequent downward movement process of the clamping piece.

In the screw tap fixture, the clamping piece comprises a plurality of petal-shaped parts which are distributed along the circumferential direction and are mutually independent, each clamping block is respectively arranged on the inner side of the lower end part of each petal-shaped part in a protruding mode, the outer side of each petal-shaped part is provided with an arc groove I, the arc grooves I are spliced into an annular groove I, an outer limit clamp spring is arranged in the annular groove I, the inner side of each petal-shaped part is provided with an arc groove II, the arc grooves II are spliced into an annular groove II, an inner limit clamp spring is arranged in the annular groove II, and each petal-shaped part mutually supports against each other under the combined action of the outer limit clamp spring and the inner limit clamp spring.

Through the arrangement of the outer limit clamp spring and the inner limit clamp spring, the mutually independent petal-shaped parts can be connected together. When the clamping piece moves upwards to enable the second guiding conical surface to move along the second acting conical surface, the petal-shaped parts can overcome the action of the outer limit clamp spring to be outwards dispersed (the outer limit clamp spring expands from the opening) under the action force exerted by the second acting conical surface, and therefore the clamping blocks are dispersed. When the clamping piece moves downwards under the action of the action spring to enable the first guide conical surface to move along the first action conical surface, each petal-shaped part can overcome the action of the inner limit clamp spring to be folded inwards (the inner limit clamp spring is folded from the opening) under the action of the first action conical surface, and therefore the gathering of each clamping block is achieved.

In the tap fixture, the lower end orifice of the clamping hole is in an outward expansion shape.

The lower end hole opening of the clamping hole is arranged to be in an outward expansion shape, so that a guiding function can be achieved, and the screw tap can conveniently penetrate through the central hole of the annular protruding portion to the inside of the mounting sleeve.

In the tap fixture, the middle part of the central hole of the mounting sleeve is provided with the internal thread, the lower part of the central hole of the mounting sleeve is internally connected with the positioning ring, and the connecting hole is the central hole of the positioning ring.

The middle part of the central hole of the installation sleeve is provided with the internal thread, so that the installation sleeve can be installed and fixed at the end part of the tapping shaft of the automatic tapping machine. The lower part of the central hole of the installation sleeve is connected with the positioning ring, and the connecting hole is the central hole of the positioning ring, so that the installation sleeve can be matched with the upper end of the tap naturally to form circumferential fixation.

In the screw tap fixture, the outer side of the upper end of the mounting sleeve is provided with the annular boss, the upper end of the acting spring is propped against the lower side surface of the annular boss, and the upper end of the lock sleeve is in threaded connection with the outer side of the annular boss.

Compared with the prior art, the screw tap fixture is provided with the lock sleeve, the upper end of which is fixedly connected with the mounting sleeve, the outer side of the lower end of the clamping piece is provided with the first guide conical surface which can move along the inner side of the lower end part of the lock sleeve and gather all clamping blocks when the clamping piece moves downwards under the action of the action spring, the inner side of the lower end of the clamping piece is provided with the second guide conical surface which can move along the outer side of the lower end part of the mounting sleeve and disperse all the clamping blocks when the clamping piece moves upwards, so that the screw tap is clamped or loosened by the self elastic force of the clamping piece is not completely realized, and the use reliability is well improved.

Drawings

Fig. 1 is a cross-sectional view of the present tap fixture.

Fig. 2 is a partial enlarged view at a in fig. 1.

Fig. 3 is a schematic perspective view of a clamping member in the present tap fixture.

Fig. 4 is another angular perspective view of the clamping member of the present tap fixture.

Fig. 5 is a schematic perspective view of a petal.

Fig. 6 is another angular perspective view of a lobe.

In the figure, 1, a mounting sleeve; 1a, an annular boss; 1b, an action conical surface II; 2. a clamping member; 2a, clamping blocks; 2b, clamping holes; 2c, guiding the first conical surface; 2d, guiding the conical surface II; 2e, petals; 2e1, arc surface I; 2e2, an arc-shaped surface II; 2e3, arc groove one; 2e4, arc-shaped groove II; 3. an action spring; 4. a lock sleeve; 4a, an action conical surface I; 5. an outer limit clamp spring; 6. an inner limit clamp spring; 7. a positioning ring; 7a, connecting holes; 8. locking the screw.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1, a tap fixture comprises a mounting sleeve 1, an action spring 3 and a cylindrical clamping piece 2, wherein a connecting hole 7a capable of being circumferentially fixed with the upper end of a tap is formed in the inner side of the mounting sleeve 1, specifically, an internal thread is formed in the middle of the mounting sleeve 1, a positioning ring 7 is connected to the lower portion of a central hole of the mounting sleeve 1, the connecting hole 7a is a square hole, and the connecting hole 7a is a central hole of the positioning ring 7. In this embodiment, the outer peripheral wall of the positioning ring 7 abuts against the inner hole wall of the lower portion of the central hole of the installation sleeve 1, the side portion of the lower end of the installation sleeve 1 is connected with a locking screw 8 in a threaded manner, and the end portion of the locking screw 8 abuts against the outer peripheral wall of the positioning ring 7 to fix the positioning ring 7 in the installation sleeve 1. The clamping piece 2 cover is located the periphery side of installation cover 1 and clamping piece 2 overcoat is equipped with the lock sleeve 4 that the upper end is fixed mutually with installation cover 1, and the lower extreme of clamping piece 2 stretches out outside the lock sleeve 4 and the lower tip inboard of clamping piece 2 has a plurality of along circumference distribution and enclose into clamping hole 2 b's grip block 2a, and clamping hole 2 b's lower extreme drill way is the flaring form, and the lower extreme of action spring 3 supports and leans on the upper end of clamping piece 2. The outer side of the upper end of the installation sleeve 1 is provided with an annular boss 1a, the upper end of the acting spring 3 is abutted against the lower side surface of the annular boss 1a, and the upper end of the lock sleeve 4 is in threaded connection with the outer side of the annular boss 1 a.

As shown in fig. 1, 2, 3 and 4, the outer side of the lower end of the clamping member 2 is provided with a first guiding conical surface 2c which can move along the inner side of the lower end of the lock sleeve 4 and gather the clamping blocks 2a when the clamping member 2 moves downwards under the action of the action spring 3, and the inner side of the lower end of the clamping member 2 is provided with a second guiding conical surface 2d which can move along the outer side of the lower end of the mounting sleeve 1 and disperse the clamping blocks 2a when the clamping member 2 moves upwards. In this embodiment, the outer side of the lower end portion of the mounting sleeve 1 has a second acting conical surface 1b, the size reduction direction of the second acting conical surface 1b is the same as the size reduction direction of the second guiding conical surface 2d, and the second guiding conical surface 2d can move along the second acting conical surface 1b when the clamping member 2 moves upwards. The inner side of the lower end part of the lock sleeve 4 is provided with an action conical surface I4 a, the size reduction direction of the action conical surface I4 a is the same as that of the guide conical surface I2 c, the guide conical surface I2 c can move along the action conical surface I4 a when the clamping piece 2 moves downwards under the action of the elasticity of the action spring 3, and a gap is reserved between the guide conical surface II 2d and the action conical surface II 1b when the guide conical surface I2 c abuts against the action conical surface I4 a.

Further, as shown in fig. 1, 2, 3, 4, 5 and 6, the clamping member 2 includes a plurality of circumferentially distributed and mutually independent lobes 2e, and each clamping block 2a is disposed in a protruding manner inside the lower end portion of each lobe 2 e. The outer side of the lower end of each petal-shaped part 2e is provided with an arc-shaped surface I2 e1, and a guide conical surface I2 c of the clamping piece 2 is spliced by the arc-shaped surfaces I2 e 1; the inner side of the lower end of each petal-shaped part 2e is provided with an arc-shaped surface two 2e2, and a guide conical surface two 2d of the clamping piece 2 is spliced by each arc-shaped surface two 2e 2. The outer side of each petal-shaped part 2e is provided with an arc-shaped groove I2 e3, the inner side of each petal-shaped part 2e is provided with an arc-shaped groove II 2e4, each arc-shaped groove I2 e3 is spliced into an annular groove I, an outer limit clamp spring 5 is arranged in the annular groove I, each arc-shaped groove II 2e4 is spliced into an annular groove II, an inner limit clamp spring 6 is arranged in the annular groove II, and each petal-shaped part 2e mutually abuts against each other under the combined action of the outer limit clamp spring 5 and the inner limit clamp spring 6.

The tapping clamp is mainly used for an automatic tapping machine for tapping nuts, and when the tapping clamp is used, the installation sleeve 1 is installed and fixed at the end part of a tapping shaft of the automatic tapping machine. When the tap needs to be clamped, the clamping piece 2 is pushed upwards (can be manually pushed) against the action of the action spring 3, at the moment, the second guiding conical surface 2d on the inner side of the lower end part of the clamping piece 2 abuts against the second acting conical surface 1b on the outer side of the lower end part of the mounting sleeve 1, the second guiding conical surface 2d moves along the second acting conical surface 1b in the subsequent upward movement process of the clamping piece 2, and the mounting sleeve 1 is fixed in the axial direction, so that an outwards expanding acting force can be formed on the lower end of the clamping piece 2, each petal-shaped part 2e is outwards dispersed (the outer limit clamp spring 5 expands from the opening) against the action of the outer limit clamp spring 5, so that each clamping block 2a is dispersed to expand the clamping hole 2b, and the upper end of the tap is inserted into the connecting hole 7a on the inner side of the mounting sleeve 1 through the clamping hole 2b to form torque transmission.

The screw tap is held, the acting force pushing up the clamping piece 2 is removed, the clamping piece 2 moves downwards under the action of the elastic force of the acting spring 3, at the moment, the second guiding conical surface 2d is separated from the second acting conical surface 1b, the first guiding conical surface 2c at the outer side of the lower end part of the clamping piece 2 is abutted against the first acting conical surface 4a at the inner side of the lower end part of the lock sleeve 4, the first guiding conical surface 2c moves along the first acting conical surface 4a in the subsequent movement of the clamping piece 2 under the action of the acting spring 3, and the lock sleeve 4 is fixed in the axial direction, so that the inward acting force can be formed on the lower end of the clamping piece 2, each petal-shaped part 2e overcomes the action of the inner limit clamp spring 6 to gather inwards (the inner limit clamp spring 6 contracts from the opening), and each clamping block 2a gathers together to shrink the clamping hole 2b and clamp the screw tap. In this state, torque is transmitted from the mounting sleeve 1 to the tap through the connecting hole 7a, and the tap is clamped by the clamping blocks 2a so as not to be skewed or fallen during tapping. After the screw cap is tapped by the screw tap driven by the tapping shaft to move downwards, the screw tap is driven by the tapping shaft to move downwards until the lower end part of the clamping piece 2 is in contact with the upper side surface of the screw cap, the clamping piece 2 can overcome the elasticity of the acting spring 3 to move upwards again due to the fact that the screw cap cannot move, so that the matching of the first guide conical surface 2c and the first acting conical surface 4a can fail, and the clamping blocks 2a on the clamping piece 2 can scatter outwards under the matching of the second guide conical surface 2d and the second acting conical surface 1b to loosen the screw tap again, and automatic falling of the screw tap is realized.

The lock sleeve 4 with the upper end fixedly connected with the installation sleeve 1 is sleeved outside the clamping piece 2, the outer side of the lower end of the clamping piece 2 is provided with the guide cone I2 c which can move along the action cone I4 a on the inner side of the lower end part of the lock sleeve 4 and gather all clamping blocks 2a when the clamping piece 2 moves downwards under the action of the action spring 3, the inner side of the lower end of the clamping piece 2 is provided with the guide cone II 2d which can move along the action cone II 1b on the outer side of the lower end part of the installation sleeve 1 and enable all the clamping blocks 2a to be dispersed when the clamping piece 2 moves upwards, so that the clamped or loosened tap is not realized by completely depending on the self elasticity of the clamping piece 2, and the reliability of use is well improved.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. The utility model provides a screw tap anchor clamps, includes installation cover (1), action spring (3) and is clamping piece (2) of tube-shape, installation cover (1) inboard be equipped with can form circumference fixed connecting hole (7 a) with the screw tap upper end, its characterized in that, clamping piece (2) cover locate the periphery side of installation cover (1) and clamping piece (2) overcoat be equipped with upper end and installation cover (1) looks fixed lock sleeve (4), the lower extreme of clamping piece (2) stretches out the lower tip inboard of outer and clamping piece (2) of lock sleeve (4) and has a plurality of along circumference distribution and enclose clamping piece (2 a) of clamping hole (2), the lower extreme of action spring (3) supports and leans on the upper end of clamping piece (2), clamping piece (2) lower extreme outside be equipped with can follow the inboard motion of lock sleeve (4) lower tip and make the direction conical surface (2 c) that each clamping piece (2 a) gathered together when clamping piece (2) is equipped with down the effect of action spring (3) and move down, clamping piece (2) lower extreme is equipped with and can make two conical surfaces (2 d) along the outside of installing down the clamping piece (2) when clamping piece (2) move down.

2. The tap fixture according to claim 1, wherein the outer side of the lower end part of the mounting sleeve (1) is provided with a second acting conical surface (1 b), the size reduction direction of the second acting conical surface (1 b) is the same as the size reduction direction of the second guiding conical surface (2 d), and the second guiding conical surface (2 d) can move along the second acting conical surface (1 b) when the clamping piece (2) moves upwards.

3. The tap fixture according to claim 2, wherein the inner side of the lower end portion of the lock sleeve (4) is provided with an action conical surface one (4 a), the dimension shrinkage direction of the action conical surface one (4 a) is the same as that of the guide conical surface one (2 c), the guide conical surface one (2 c) can move along the action conical surface one (4 a) when the clamping piece (2) moves downwards under the action of the elastic force of the action spring (3), and a gap is formed between the guide conical surface two (2 d) and the action conical surface two (1 b) when the guide conical surface one (2 c) abuts against the action conical surface one (4 a).

4. The tap fixture according to claim 1, 2 or 3, wherein the clamping piece (2) comprises a plurality of petal-shaped parts (2 e) which are distributed along the circumferential direction and are mutually independent, each clamping block (2 a) is respectively arranged on the inner side of the lower end part of each petal-shaped part (2 e) in a protruding mode, an arc-shaped groove I (2 e 3) is arranged on the outer side of each petal-shaped part (2 e) and is spliced into an annular groove I, an outer limit clamp spring (5) is arranged in the annular groove I, an arc-shaped groove II (2 e 4) is arranged on the inner side of each petal-shaped part (2 e) and is spliced into an annular groove II, an inner limit clamp spring (6) is arranged in the annular groove II, and each petal-shaped part (2 e) is mutually abutted against under the combined action of the outer limit clamp spring (5) and the inner limit clamp spring (6).

5. Tap holder according to claim 1, characterised in that the lower end opening of the holding hole (2 b) is flared.

6. The tap fixture according to claim 1, wherein the middle part of the central hole of the mounting sleeve (1) is provided with an internal thread, the lower part of the central hole of the mounting sleeve (1) is connected with a positioning ring (7), and the connecting hole (7 a) is the central hole of the positioning ring (7).

7. The tap fixture according to claim 6, wherein the outer side of the upper end of the mounting sleeve (1) is provided with an annular boss (1 a), the upper end of the acting spring (3) is abutted against the lower side surface of the annular boss (1 a), and the upper end of the lock sleeve (4) is in threaded connection with the outer side of the annular boss (1 a).