CN113997214B

CN113997214B - Multifunctional flat tongs

Info

Publication number: CN113997214B
Application number: CN202111232434.0A
Authority: CN
Inventors: 陈跃; 农胜隆; 曾向阳; 申邵峰; 张金瑞; 刘广; 于宗平; 陈沛; 刘晓; 杨智堂
Original assignee: Liuzhou Institute of Technology
Current assignee: Liuzhou Institute of Technology
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2023-02-28
Anticipated expiration: 2041-10-22
Also published as: CN113997214A

Abstract

A multifunctional flat-nose pliers relates to a flat-nose pliers, which comprises a jaw mechanism, a middle swing moving mechanism and a rotating base, wherein the jaw mechanism comprises a jaw base, a fixed jaw and a sliding jaw; the fixed jaw is fixed at one end of the top of the jaw base, the sliding jaw is in sliding fit with the other end of the top of the jaw base, and the sliding jaw clamps a workpiece through the quick clamping mechanism; the jaw mechanism is arranged on the middle swinging moving mechanism, and the middle swinging moving mechanism is arranged on the rotating base. The invention can position and clamp workpieces through the jaw mechanism, the middle swing moving mechanism can realize the adjustment of swing angles and the fine adjustment movement in the front, back, left and right directions, the rotary positioning can be realized through the rotary base, the position adjustment is convenient, and the processing range of the workpieces is enlarged. The invention also has the characteristics of high processing efficiency, reliable clamping action, capability of being disassembled and assembled according to workpieces with different shapes, capability of clamping various irregular workpieces, high universality, low cost and the like, and is easy to popularize and apply.

Description

Multifunctional flat tongs

Technical Field

The invention relates to flat tongs, in particular to multifunctional flat tongs.

Background

The flat tongs are a universal fixture used for clamping workpieces in machining and manufacturing, the existing flat tongs generally comprise a base, a fixed jaw, a movable jaw and a screw rod, a slide rail is arranged on the base, the movable jaw is slidably connected with the slide rail, the fixed jaw is fixed on the base, a nut is fixed on the movable jaw, and the screw rod penetrates through the nut and then is fixed on the base through a bearing. The flat tongs have the following defects: because the fixed jaw is used for positioning when clamping the workpiece, once the base is fixed, the position of the fixed jaw is also fixed, and the positioning surface of the fixed jaw cannot be randomly adjusted; however, in the actual use process, especially on a numerical control machine tool, the position of the base needs to be adjusted when the multifunctional precise flat tongs are used for positioning, so that the positioning surface of the fixed jaw is attached to a workpiece, the adjustment of the position of the base is very inconvenient, great inconvenience is brought to the operation of workers, and the processing efficiency is greatly influenced.

The invention patent with the publication number of CN209903010U discloses 'flexible multifunctional self-centering flat tongs', which has the following defects:

(1) The workpiece clamping device cannot clamp the workpiece quickly, even if a jaw above the T-shaped groove can move quickly to be close to the workpiece, the two first bolts at two ends still need to be screwed, and the workpiece can be clamped only by rotating the screw rod through the traditional screw rod mechanism. The clamping is only realized by screwing two first bolts, so that the labor is wasted, and whether the workpiece is clamped or not cannot be ensured;

(2) The whole flat-nose pliers can only rotate around the Z axis, the rotation is still strongly interfered by manpower, and the flat-nose pliers are designed to be round and convenient to rotate but consume much physical force and time.

The invention patent with the publication number of CN212470612U discloses a novel flexible jaw structure with a quick replaceable precision multi-surface quick flat-nose pliers, which still has the following defects:

(1) In the clamping and positioning process, a clamping pin is needed to be used, so that the lifting piece is fixed in the middle of the clamping hole, and the operation is needed for each clamping, which is still very troublesome and time-consuming;

(2) The jaw structure has only 1 degree of freedom and can only rotate around the Y axis. The rotation angle is limited, the rapid locking can be realized only when the clamping table rotates by 0/90 degrees, other angles can be realized only when the standard rod is lapped on the gauge blocks with the height to be calculated, and the gauge blocks with different heights are very troublesome.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides a multifunctional flat tongs, which solves the problems that the workpiece position adjustment in the prior art is inconvenient, the processing efficiency is influenced, and the workpiece can not be clamped quickly.

The technical scheme for solving the technical problems is as follows: a multifunctional flat-nose pliers comprises a jaw mechanism for positioning and clamping a workpiece, wherein the jaw mechanism comprises a jaw base, a fixed jaw and a sliding jaw; the fixed jaw is fixed at one end of the top of the jaw base, and the sliding jaw is in sliding fit with the other end of the top of the jaw base; the sliding jaw clamps a workpiece through a quick clamping mechanism; the multifunctional flat tongs also comprise a middle swinging moving mechanism for adjusting the swinging angle and finely adjusting the movement in the front, back, left and right directions and a rotating base for rotating and positioning, wherein the jaw mechanism is arranged on the middle swinging moving mechanism, and the middle swinging moving mechanism is arranged on the rotating base.

The further technical scheme of the invention is as follows: the quick clamping mechanism comprises a bottom locking block, a hemispherical part and a fastening bolt, wherein the bottom locking block is integrally formed by a cam end positioned at the lower part and a cylindrical end positioned at the upper part, and the cam end of the bottom locking block is obliquely arranged in a cam sliding groove arranged in the middle of the jaw base in a forward tilting manner; positioning columns are respectively arranged on two sides of the cylindrical end of the bottom locking block, and a threaded hole is formed in the cylindrical end; a forward-inclined hemispherical part mounting through hole is formed in the middle of the sliding jaw, and the hemispherical part is mounted in the hemispherical part mounting through hole; the fastening bolt obliquely penetrates through the hemispherical part and is connected with the threaded hole of the bottom locking block through threads; the front side and the rear side of the jaw base are respectively provided with a plurality of arc groove bayonets which are matched with the positioning columns.

The further technical scheme of the invention is as follows: the opposite ends of the fixed jaw and the sliding jaw are respectively connected with flexible tong head modules for positioning profiles of profile-shaped surface members; the flexible binding clip module comprises a flexible binding clip base, a binding clip knob, a plurality of thimble assemblies, an upper pressing plate, a lower pressing plate, a left pressing plate, a right pressing plate and a cover plate; the flexible binding clip base is respectively arranged at one end opposite to the fixed jaw and the sliding jaw, the upper pressing plate and the lower pressing plate are respectively arranged inside the upper end and the lower end of the flexible binding clip base, the left pressing plate and the right pressing plate are respectively arranged inside the left side and the right side of the flexible binding clip base, the cover plate is arranged on the inner side of the flexible binding clip base, and the cover plate is provided with thimble assembly mounting holes matched with a plurality of thimble assemblies; the clamp head knobs are respectively arranged at the upper end, the left side and the right side of the flexible clamp head module through threads, and the tail ends of the threads of the clamp head knobs are respectively tightly propped against the upper pressing plate, the lower pressing plate and the left pressing plate and the right pressing plate; the plurality of thimble assemblies are arranged in the thimble assembly mounting holes of the cover plate according to a rule respectively.

The invention further adopts the technical scheme that: the thimble assembly comprises a square locking rod, a push rod and a reset spring, wherein the front end of the push rod is a spherical contact or a conical contact or a square contact which is contacted with a workpiece, the reset spring is sleeved at the middle part of the push rod, the rear end of the push rod is connected with the square locking rod through threads, and the square locking rod is regularly arranged in a thimble assembly mounting hole of the cover plate.

The further technical scheme of the invention is as follows: the jaw mechanism also comprises a movable fixed jaw, the movable fixed jaw comprises a middle component and a side plate, and various chucks for clamping workpieces are arranged at the inner end of the middle component; the middle assembly is connected with the side plates through tightening bolts positioned on two sides, and the bottom of each side plate is provided with a convex hook through which the jaw base is hooked.

The further technical scheme of the invention is as follows: the jaw mechanism further comprises a heightening block, and the heightening block is respectively arranged on the sliding jaw and the middle assembly.

The invention has the further technical scheme that: the middle swing moving mechanism comprises a clamp body base, a circular shaft seat and a shaft sleeve seat; the clamp body base is provided with a concave through groove along the length direction, and the bottom of the clamp jaw base is positioned in the concave through groove and is in sliding fit with the concave through groove; two side walls of the concave through groove are also connected with 7-shaped positioning blocks along the top, and the side surfaces of the positioning blocks are connected with positioning bolts for providing clamping force to the concave grooves; the bottom of the caliper body base is provided with a special-shaped groove with two ends bent upwards along the width direction, a T-shaped groove is arranged above the special-shaped groove, and a T-shaped block which is connected with the caliper body base and the round shaft seat through an inner hexagonal screw is arranged in the T-shaped groove; the top of the round shaft seat is provided with a T-shaped boss III, and the T-shaped boss III is in sliding fit with the special-shaped groove; two ends of the round shaft seat are respectively provided with a round shaft; the shaft sleeve seats are respectively positioned on the left side and the right side of the bottom of the clamp body base, are rotatably connected with a round shaft of the round shaft seat and are locked through a shaft locking mechanism, and the bottom ends of the shaft sleeve seats are fixedly connected with the rotating base.

The invention has the further technical scheme that: the shaft sleeve seat is also provided with a shaft locking block mounting groove; the locking shaft mechanism comprises a locking shaft block and a locking shaft knob, the locking shaft block is arranged in a locking shaft block mounting groove of the shaft sleeve seat and is fixedly connected with the shaft sleeve seat through a fastener, a round shaft mounting hole is formed in the middle of the upper end of the locking shaft block, an open groove is formed between the middle of the top end of the locking shaft block and the middle of the top end of the round shaft mounting hole, and scale marks are arranged along the periphery of the upper half part of the round shaft mounting hole; the lock shaft knob is tightly screwed on one side of the lock shaft block through threads.

The further technical scheme of the invention is as follows: the rotary base comprises a base, an upper rotary table, a lower rotary table, two pawls, a rotating rod, a spring and a thrust ball bearing; the base comprises a bottom plate and a base fixedly arranged on the bottom plate, a bearing mounting hole is formed in the base, and a lower rotary table mounting annular groove and a rotary rod mounting annular groove are respectively formed in the periphery of the bearing mounting hole from inside to outside; the base is also provided with a notch, and the top end of the notch is provided with a baffle plate; one end of the thrust ball bearing is arranged on the lower rotating disc, and the other end of the thrust ball bearing is arranged in a bearing mounting hole of the base; the lower rotary table is arranged in a lower rotary table mounting annular groove of the base, and the top end of the lower rotary table is fixedly connected with the bottom of the upper rotary table; the top of the upper rotating disc is fixedly connected with the shaft sleeve seat, and the top surface of the upper rotating disc is provided with scale marks; the rotating rod consists of a rotating ring and a rod piece, the rotating ring is arranged in an annular groove for installing the rotating rod of the base, the rod piece extends out of the gap of the base, and the rod piece is respectively provided with a connecting rod I and a connecting rod II; the connecting rod I is respectively connected with one ends of the two pawls, and the other ends of the two pawls are meshed with a rotating gear of the downward rotating turntable; and one end of the spring is connected to the two pawls respectively, and the other end of the spring is connected to the connecting rod II respectively.

Due to the adoption of the structure, compared with the prior art, the multifunctional flat-nose pliers have the following beneficial effects:

1. the position of the workpiece is convenient to adjust

The device comprises a jaw mechanism, a middle swinging and moving mechanism and a rotating base, wherein the jaw mechanism is used for positioning and clamping a workpiece, the middle swinging and moving mechanism is used for adjusting a swinging angle and performing fine tuning movement in the front, back, left and right directions, and the rotating base is used for rotating and positioning; the jaw mechanism is arranged on the middle swing moving mechanism, and the middle swing moving mechanism is arranged on the rotating base. Therefore, the invention can realize the adjustment of the swing angle and the fine adjustment movement in the front, back, left and right directions through the middle swing moving mechanism, and can realize the rotary positioning through the rotary base. The whole flat-nose pliers can realize the adjustment of four degrees of freedom, including X-axis and Y-axis movement and rotation around Z-axis and Y-axis, and the adjustment is carried out in the groove during movement, so that the overturning caused by larger stress can be avoided; the rotation range is stepless adjustment, which is convenient for controlling various rotation angles. Therefore, the invention can conveniently adjust the position of the workpiece and greatly increase the processing range of the workpiece.

Specifically, the method comprises the following steps: the jaw mechanism comprises a jaw base, a fixed jaw, a sliding jaw and a flexible jaw module; the middle swing moving mechanism comprises a clamp body base, a circular shaft seat and a shaft sleeve seat; the rotating base comprises a base, an upper rotating disc, a lower rotating disc, two pawls, a rotating rod, a spring and a thrust ball bearing.

(1) Can realize the adjustment of the front, back, left and right movement

The jaw base of the jaw mechanism is arranged on the jaw body base of the middle swinging moving mechanism and can move back and forth, and the circular shaft base and the jaw body base of the middle swinging moving mechanism can realize left-right movement adjustment, so that the jaw mechanism can move in two vertical directions to increase the processing range of workpieces.

(2) Can realize up-down swing positioning

The circular shaft seat of the middle swing moving mechanism can rotate in the locking shaft block, and when the circular shaft seat rotates at a proper angle, the whole pliers body can be fixed only by screwing the knob of the locking shaft. Therefore, the invention can realize the swing in the front and back directions in the processing so as to increase the processing range of the workpiece.

(3) Can realize rotary positioning

The rotating base at the bottom of the invention can realize angle adjustment and positioning through the upper rotating disc, the lower rotating disc and the thrust ball bearing.

2. High processing efficiency

The invention can realize the adjustment of the swing angle and the fine adjustment movement in the front, back, left and right directions through the middle swing moving mechanism, can realize the rotation positioning through the rotating base, can ensure that the position adjustment of a workpiece is more convenient, and greatly improves the processing efficiency.

In addition, different from the principle that other common flat tongs adopt a screw rod, the flat tongs can realize quick clamping by adopting a quick clamping mechanism, and the quick clamping mechanism comprises a bottom locking block, a hemispherical part and a fastening bolt. After the workpiece is positioned, a chuck on the sliding jaw is pushed to be close to the surface of the workpiece, and positioning columns on two sides of a bottom locking block of the rapid clamping mechanism rapidly move between circular arc groove bayonets on the jaw base; after the chuck on the sliding jaw is completely contacted with the workpiece, the positioning columns on two sides of the bottom locking block are certainly clamped in a certain arc groove bayonet of the jaw base; thus, a coarse motion is achieved. If the workpiece is clamped, the fastening bolt arranged on the sliding jaw is screwed, so that the sliding jaw is subjected to axial force along the fastening bolt, horizontal component force and vertical component force can be obtained by decomposing the axial force, the cam end at the lower part of the bottom locking block can push the sliding jaw to move towards the workpiece under the action of the horizontal component force, and the workpiece can be clamped only by screwing the fastening bolt, so that fine adjustment action is completed. In addition, the lower part of the bottom locking block adopts a cam structure design, so that friction with the jaw base can be prevented, and errors are reduced. The structure solves the defects of overlong clamping time and poor precision of the common flat tongs.

The workpiece clamping device can ensure that the workpiece is clamped through the quick clamping mechanism, and the quick clamping mechanism is very convenient to use and disassemble, so that the labor efficiency is greatly improved, the labor intensity is reduced, and the production efficiency is improved.

3. Can realize rapid clamping

The sliding jaw clamps a workpiece through a quick clamping mechanism, and the quick clamping mechanism comprises a bottom locking block, a hemispherical part and a fastening bolt, wherein the bottom locking block is integrally formed by a cam end positioned at the lower part and a cylindrical end positioned at the upper part. The cam structure of the bottom locking block is utilized, the adjusting stroke is large, the speed is high, the sliding jaw can be quickly moved to be attached to a workpiece to finish coarse adjustment, and then the fastening bolt is screwed to realize fine adjustment; and the fixed jaw is fixed on the jaw body through a bolt, so that the workpiece can be clamped only by screwing the fastening bolt of the sliding jaw. In addition, the cam structure can lengthen the stroke of adjustment to can realize stepless regulation, the precision is higher.

4. Reliable clamping action

The invention is different from the traditional mode in clamping the workpiece, but adopts the design of the rapid clamping mechanism with a cam structure, and the design optimizes the traditional structure. The rapid clamping mechanism provided by the invention has the advantages that the positioning columns on the two sides of the bottom locking block are used for clamping the arc groove bayonet of the jaw base and the fastening bolt is used for locking the bottom locking block, so that the clamping of the bench clamp is realized, the structure is more compact, the reliability is high, the workpiece is not easy to loosen when being processed, the damage rate is greatly reduced, the flat tongs have longer service life, and the cost is reduced.

5. Can be disassembled and combined according to workpieces with different shapes

The jaw mechanism of the invention adopts the modular jaw, and the modular jaw has the advantages that the modular jaw can be disassembled and assembled according to workpieces with different shapes, such as:

(1) The sliding jaw and the fixed jaw on the jaw base can be combined with different flexible jaw modules.

(2) The movable fixed jaws can be installed at the same time, so that the multi-station positioning and clamping can be realized among the sliding jaw, the movable fixed jaws and the fixed jaws.

(3) The sliding jaw and the movable fixed jaw on the jaw base can be used for adapting to the clamping of workpieces with different heights through the heightening module.

(4) A flexible jaw module and a chuck can be arranged on the sliding jaw and the fixed jaw; the clamping heads can be arranged on both sides in the movable fixed jaw, and the clamping heads can be arranged on the sliding jaw and the heightening module of the movable fixed jaw. The chucks can be provided with the chucks as required according to actual needs, so that multifunctional clamping can be realized.

6. Can clamp various irregular workpieces

The adopted flexible binding clip module comprises a flexible binding clip base, a binding clip knob, a plurality of thimble assemblies, an upper pressing plate, a lower pressing plate, a left pressing plate, a right pressing plate and a cover plate; the ejector pin assemblies can freely stretch and retract under the action of the return spring, and can be in self-adaptive full contact with workpieces with different shapes, so that the workpieces made of hard and soft materials can be clamped. In addition, in the aspect of the shape of the workpiece, the ejector pin component can be replaced by the ejector pin component which is adaptive to the workpiece with different shapes so as to enhance the positioning stability. Therefore, the invention can clamp various irregular workpieces even curved surfaces, irregular workpieces and workpieces which can not be clamped by common flat tongs, and greatly widens the range of the flat tongs capable of clamping the workpieces.

In addition, the jaw base and the jaw body base of the invention can also be detached and are simple to fix, and a plurality of flat-nose pliers can be combined to realize the combination of a table top, the clamping of super-long parts, special-shaped parts and the like.

7. High universality and low cost

The chuck is quickly replaced through the dovetail groove, and the V-shaped chuck, the flexible chuck and the rigid chuck can be installed as required, so that the purpose of effective clamping is achieved. Meanwhile, the machining requirement can be finished only by debugging and replacing the clamping block without being limited to the aspects of hardness and shape of workpiece materials (such as a workpiece made of an over-hard and soft material, a cylindrical or cylindrical tool piece and the like), the universality is high, a clamp for manufacturing a special workpiece is not needed, and the machining cost is greatly reduced.

In addition, the invention can also clamp large workpieces; or multi-clamping operation is carried out, two or more workpieces are clamped for processing, and if the workpieces are too large, the jaws can be increased, so that certain clamping time is saved in mass production.

The technical features of the multi-functional flat-nose pliers of the present invention will be further described with reference to the accompanying drawings and examples.

Drawings

FIG. 1: embodiment A schematic three-dimensional structure of the multi-functional flat-nose pliers of the present invention,

FIG. 2: example a schematic perspective view of the jaw mechanism,

FIG. 3: example a front cross-sectional view of the jaw mechanism,

FIG. 4: in the top view of figure 3 of the drawings,

FIG. 5: example a schematic view of the structure of the jaw base,

FIG. 6: example a schematic view of the structure of the fixed jaw,

FIG. 7: example a schematic view of the sliding jaw configuration,

FIG. 8: embodiment a schematic structural view of a bottom locking block of the quick clamping mechanism,

FIG. 9: embodiment one structural schematic diagram of the flexible binding clip module,

FIG. 10: embodiment one structural schematic diagram of the base of the flexible forceps head,

FIG. 11: embodiment one is a schematic structural view of the cover plate,

FIG. 12: embodiment a structural schematic view of the thimble assembly,

FIG. 13: embodiment a schematic structural view of the square locking bar,

FIG. 14: embodiment one is a schematic structural view of the push rod,

FIG. 15: example a schematic view of another form of the push rod,

FIG. 16: example a schematic structural view of yet another form of the putter,

FIG. 17: embodiment one of the structural schematic diagrams of the middle swinging movement mechanism,

FIG. 18: second embodiment of the present invention (viewed from another direction) is a schematic structural view of the middle swing movement mechanism,

FIG. 19: embodiment one is a structural schematic diagram of the base of the caliper body,

FIG. 20: embodiment a schematic structural view of the circular shaft seat,

FIG. 21: embodiment a structural schematic view of the shaft sleeve seat,

FIG. 22: example a schematic view of the structure of the T-block,

FIG. 23: embodiment I a schematic view of a connection structure between the caliper body base and the circular shaft seat,

FIG. 24: embodiment one structural schematic diagram of the lock shaft block,

FIG. 25 is a schematic view of: embodiment one is a schematic structural view of the rotating base,

FIG. 26: example a detonation diagram of the rotating base,

FIG. 27 is a schematic view showing: the schematic structural diagram of the rotating base after the upper rotating disc is removed,

FIG. 28: in the top view of figure 27, the top view,

FIG. 29: the cross-sectional viewbase:Sub>A-base:Sub>A of figure 28,

FIG. 30: embodiment one is a schematic structural view of the base,

FIG. 31: embodiment one the structure of the turning rod is schematically shown,

FIG. 32: second embodiment a schematic structural view of the jaw mechanism,

FIG. 33: example two the structure of the movable fixed jaw is schematically shown,

FIG. 34 is a schematic view of: embodiment three is a structural schematic diagram of the jaw mechanism;

in the above drawings, the respective reference numerals are explained as follows:

1-a jaw mechanism, wherein the jaw mechanism is arranged on the jaw,

11-a jaw base, 111-T-shaped bosses I, 112-arc groove bayonets, 113-cam sliding grooves,

12-fixing the jaw, namely fixing the jaw,

13-sliding jaw, 131-hemispherical part mounting through hole,

14-quick clamping mechanism, 141-bottom lock, 1411-cam end, 1412-cylinder end, 1413-positioning post,

142-hemispherical parts, 143-fastening bolts,

15-flexible binding clip module, 151-flexible binding clip base, 1511-T-shaped boss II, 152-binding clip knob,

153-spike assembly, 1531-square locking bar,

1532 push rod, 15321 ball contact, 15322 cone contact, 15323 square contact,

1533-a return spring for the spring,

154-upper and lower pressing plates, 155-left and right pressing plates, 156-cover plate, 1561-thimble assembly mounting hole,

16-moving the fixed jaw, 161-intermediate assembly, 1611-dovetail groove III, 162-side plate, 1621-hook,

163-the tightening of the screw(s),

17-heightening block, 18-fixed chuck, 19-fixed block,

2-a middle swing moving mechanism for swinging the movable plate,

21-a caliper body base, 211-a concave through groove, 212-a special-shaped groove, 213-a T-shaped groove,

22-round shaft seat, 221-T-shaped boss III, 222-round shaft,

23-shaft sleeve seat, 231-shaft locking block mounting groove,

24-a positioning block is arranged on the upper surface of the steel pipe,

25-positioning the bolt, namely positioning the bolt,

26-T-shaped block, 261-inner hexagon bolt,

27-a shaft locking mechanism, 271-a shaft locking block, 2711-a round shaft mounting hole, 2712-an open slot, 272-a shaft locking knob,

3-rotating the base, wherein the base is provided with a plurality of rotating holes,

31-a base, 311-a bottom plate, 312-a base, 3121-a bearing mounting hole, 3122-a lower rotary table mounting annular groove,

3123 installing annular groove, 3124 notch, 3125 baffle plate on rotating rod,

32-the upper rotating disc is rotated upwards,

33-rotating the rotating disc downwards,

34-the pawl is arranged on the base plate,

35-rotating rod, 351-rotating ring, 352-rod, 353-connecting rod I, 354-connecting rod II,

36-a spring, which is provided with a spring,

37-thrust ball bearing.

Detailed Description

The first embodiment is as follows:

a multifunctional flat-nose pliers is suitable for a flexible clamping mode and comprises a jaw mechanism 1 for positioning and clamping a workpiece, a middle swinging moving mechanism 2 for adjusting a swinging angle and finely adjusting and moving in the front, back, left and right directions and a rotating base 3 for rotating and positioning, wherein the jaw mechanism 1 is installed on the middle swinging moving mechanism 2, and the middle swinging moving mechanism 2 is installed on the rotating base 3.

The jaw mechanism 1 comprises a jaw base 11, a fixed jaw 12 and a sliding jaw 13; the top of the jaw base 11 is provided with a T-shaped boss I111 along the length direction, and the bottoms of the fixed jaw 12 and the sliding jaw 13 are respectively provided with a dovetail groove I matched with the T-shaped boss I111; the fixed jaw 12 is sleeved at one end of a T-shaped boss I111 of the jaw base 11 through a dovetail groove I and fixedly connected together through a bolt; the sliding jaw 13 is in sliding fit with the other end of the T-shaped boss I111 of the jaw base 11 through the dovetail groove I and is clamped and positioned through the quick clamping mechanism 14;

the quick clamping mechanism 14 comprises a bottom locking block 141, a hemispherical part 142 and a fastening bolt 143, wherein the bottom locking block 141 is integrally formed by a lower cam end 1411 and an upper cylindrical end 1412, and the cam end 1411 of the bottom locking block 141 is obliquely and forwardly arranged in a cam sliding groove 113 arranged in the middle of the jaw base 11; positioning columns 1413 are respectively arranged on two sides of the cylindrical end 1411 of the bottom locking block 141, and threaded holes are formed in the cylindrical end 141; a forward inclined semi-spherical part mounting through hole 131 is formed in the middle of the sliding jaw 13, and the semi-spherical part 142 is mounted in the semi-spherical part mounting through hole 131; the fastening bolt 143 is obliquely penetrated through the hemispherical part 142 and is connected with the threaded hole of the bottom locking block 141 through threads; the front side and the rear side of the jaw base 11 are respectively provided with a plurality of arc groove bayonets 112, and the arc groove bayonets 112 are matched with the positioning columns 1413.

The opposite ends of the fixed jaw 12 and the sliding jaw 13 are respectively connected with a flexible binding clip module 15 for positioning profiles of different-shaped face parts; the flexible binding clip module 15 comprises a flexible binding clip base 151, a binding clip knob 152, a plurality of thimble assemblies 153, an upper press plate 154, a lower press plate 154, a left press plate 155, a right press plate 155 and a cover plate 156; the end part of the flexible clamp head base 151 is provided with a T-shaped boss II 1511, the opposite end parts of the fixed jaw 12 and the sliding jaw 13 are respectively provided with a dovetail groove II, the flexible clamp head base 151 is respectively fixedly connected in the dovetail grooves II of the fixed jaw 12 and the sliding jaw 13 through the T-shaped boss II, and the fixed jaw 12 is fixedly connected with the flexible clamp head base 151 through a fixed block 19; the upper pressing plate 154 and the lower pressing plate 154 are respectively installed inside the upper end and the lower end of the flexible binding clip base 151, the left pressing plate 155 and the right pressing plate 155 are respectively installed inside the left side and the right side of the flexible binding clip base 151, the cover plate 156 is installed on one side of the flexible binding clip base 151 opposite to the T-shaped boss II 1511, and the cover plate 156 is provided with ejector pin assembly installation holes 1561 matched with the plurality of ejector pin assemblies 153; the tong head knobs 152 are respectively installed at the upper end, the left side and the right side of the flexible tong head module 15 through threads, and the tail ends of the threads of the tong head knobs 152 are respectively tightly propped against the upper and lower pressing plates 154 and the left and right pressing plates 155; the flexible pliers head can clamp a workpiece to be machined by rotating the pliers head knob 152 clockwise to apply pressure to the upper and lower pressing plates and extending the pressure to the left and right pressing plates to increase friction force, and the plurality of ejector pin assemblies 153 are arranged in the ejector pin assembly mounting holes 1561 of the cover plate 156 according to a regular pattern.

The thimble assembly 153 includes a square locking rod 1531, a push rod 1532, and a return spring 1533, the front end of the push rod 1532 is a spherical contact 15321 (see fig. 14) contacting with the workpiece, the return spring 1533 is sleeved at the middle part of the push rod 1532, and the purpose of installing the return spring is to save the time of manually returning the position of the clamp after the clamp clamps the workpiece and to avoid the dent on the surface of the workpiece; the rear end of the push rod 1532 is connected to a square locking rod 1531 through a screw thread, and the square locking rod 1531 is regularly arranged in the thimble assembly mounting hole 1561 of the cover plate 156. The square locking bar 1531 is square to lock the workpiece by limiting the movement of the locking bar by the pressure of the workpiece and the upper, lower, left, and right pressing plates when the locking bars are stacked.

Of course, the front end of the push rod 1532 contacting the workpiece may be a tapered contact 15322 (see fig. 15) or a square contact 15323 (see fig. 16).

The middle swing moving mechanism 2 comprises a clamp body base 21, a round shaft seat 22 and a shaft sleeve seat 23; the clamp body base 21 is provided with a concave through groove 211 along the length direction thereof, and the bottom of the clamp jaw base 11 is positioned in the concave through groove 211 and is in sliding fit with the concave through groove 211; two side walls of the concave through groove 211 are also connected with 7-shaped positioning blocks 24 along the top, and the side surfaces of the positioning blocks 24 are connected with positioning bolts 25 for providing clamping force to the concave groove 211; the bottom of the caliper body base 21 is provided with a special-shaped groove 212 with two ends bent upwards along the width direction, a T-shaped groove 213 is arranged above the special-shaped groove 212, and a T-shaped block 26 which is connected with the caliper body base 21 and the round shaft seat 22 through an inner hexagonal bolt 261 is arranged in the T-shaped groove 213; the top of the circular shaft seat 22 is provided with a T-shaped boss III 221, and the T-shaped boss III 221 is in sliding fit with the special-shaped groove 212; the two ends of the round shaft seat 22 are respectively provided with a round shaft 222; the shaft sleeve seats 23 are respectively positioned at the left side and the right side of the bottom of the caliper body base 21, the shaft sleeve seats 23 are rotatably connected with the circular shafts 222 of the circular shaft seats 22 and are locked through a shaft locking mechanism 27, and the bottom ends of the shaft sleeve seats 23 are fixedly connected with the rotating base 3.

The shaft sleeve seat 23 is also provided with a shaft locking block mounting groove 231; the shaft locking mechanism 27 comprises a shaft locking block 271 and a shaft locking knob 272, wherein the shaft locking block 271 is arranged in a shaft locking block mounting groove 231 of the shaft sleeve seat 23 and is fixedly connected with the shaft sleeve seat 23 through a fastener, a circular shaft mounting hole 2711 is arranged in the middle of the upper end of the shaft locking block 271, an open groove 2712 is arranged between the middle of the top end of the shaft locking block 271 and the middle of the top end of the circular shaft mounting hole 2711, and scale marks are arranged along the periphery of the upper half part of the circular shaft mounting hole 2711; the lock shaft knob 272 is screwed on one side of the lock shaft block 271.

The rotating base 3 comprises a base 31, an upper rotating disc 32, a lower rotating disc 33, two pawls 34, a rotating rod 35, a spring 36 and a thrust ball bearing 37; the base 31 comprises a bottom plate 311 and a base 312 fixedly installed on the bottom plate 311, a bearing installation hole 3121 is arranged in the base 312, and a lower rotary table installation annular groove 3122 and a rotary rod installation annular groove 3123 are respectively arranged from inside to outside on the periphery of the bearing installation hole 3121; the base 312 is further provided with a notch 3124, and a baffle 3125 is installed at the top end of the notch 3124; one end of the thrust ball bearing 37 is mounted on the lower rotating disc 33, and the other end of the thrust ball bearing 37 is mounted in the bearing mounting hole 3121 of the base 31; the lower rotary table 33 is arranged in the lower rotary table mounting annular groove 3122 of the base 31, and the top end of the lower rotary table 33 is fixedly connected with the bottom of the upper rotary table 32; the top of the upper rotating disc 32 is fixedly connected with the shaft sleeve seat 23, and the top surface of the upper rotating disc 32 is provided with scale marks; the rotating rod 35 is composed of a rotating ring 351 and a rod piece 352, the rotating ring 351 is installed in a rotating rod installation annular groove 3123 of the base 31, the rod piece 352 extends out of a notch 3124 of the base 312, and the rod piece 352 is respectively provided with a connecting rod I353 and a connecting rod II 354; the connecting rod I353 is respectively connected with one ends of the two pawls 34, and the other ends of the two pawls 34 are meshed with the rotating gear of the lower rotating disc 33; one end of the spring 36 is respectively connected to the two pawls 34, and the other end of the spring 36 is respectively connected to the connecting rod II 354.

In this embodiment, the multifunctional flat-nose pliers implement the following action processes:

1. the clamping action process comprises the following steps:

after the workpiece is positioned, the chuck on the sliding jaw 13 is pushed to be close to the surface of the workpiece, and at this time, the positioning columns 1413 on the two sides of the bottom locking block 141 of the rapid clamping mechanism 14 rapidly move between the arc slot bayonets 112 on the jaw base 11; after the chuck on the sliding jaw 13 is completely contacted with the workpiece, the positioning posts 1413 on both sides of the bottom locking block 141 are necessarily clamped in a certain arc groove bayonet 112 of the jaw base 11; thus, a coarse motion is achieved. If the workpiece is clamped further, the fastening bolt 143 mounted on the sliding jaw 13 is tightened, so that the sliding jaw 13 is subjected to an axial force along the fastening bolt 143, the axial force is decomposed to obtain a horizontal component and a vertical component, the sliding jaw 13 moves towards the workpiece under the action of the horizontal component, and thus, the workpiece can be clamped only by tightening the fastening bolt 143, and the fine adjustment action is completed.

Flexible binding clip module positioning action

If irregular workpieces such as spherical surfaces, inclined surfaces and the like need to be clamped, the common flat tongs are difficult to clamp or are not firm to clamp. The front ends of the fixed jaw 12 and the sliding jaw 13 are respectively connected with a flexible binding clip module 15, and 56 thimble assemblies 153 are arranged on the flexible binding clip module 15. The mode is suitable for clamping parts with irregular shapes, special shapes and the like, and can also clamp common parts.

(1) Clamping: an irregular workpiece is placed between a sliding jaw 13 and a flexible tong head module 15 installed on a fixed jaw 12, the sliding jaw 13 is manually pushed to move forwards, 56 ejector pin assemblies 153 on the flexible tong head module 15 are enabled to automatically adjust the moving distance of a push rod 1532 in a flexible tong head base 151 under the action of a reset spring 1533 and forward thrust to enable a spherical contact head 15321 to be in point-effect contact with multiple surfaces of the clamped irregular workpiece, (the contact head is spherical and can achieve point contact), then tong head knobs 152 on the upper surface and two side surfaces of the flexible tong head module 15 are screwed, upper and lower and left and right pressing plates in the flexible tong head base 151 are enabled to move left and right, 56 square locking rods 1531 which are regularly arranged are enabled to be in contact with each other under the action of force and friction force to be locked, and the push rod is prevented from moving.

(2) Loosening: the fastening bolt 143 mounted on the sliding jaw 13 is loosened, the whole sliding jaw 13 is moved backward by force, so as to realize loosening and clamping, the jaw knobs 152 on the upper surface and two side surfaces of the flexible jaw module 15 are loosened, the upper, lower, left and right pressing plates are separated from contact with the square locking rod 1531, and the 56 thimble assemblies 153 in the flexible jaw base 151 move under the action of the return spring 1533, so as to automatically return.

Move front and back and left and right

The middle swing movable support 2 mainly comprises a clamp body base 21, a round shaft seat 22 and a shaft sleeve seat 23; the jaw base 11 can slide back and forth on the jaw body base 21 to a certain distance and is fixed; and the clamp body base 21 and the clamp opening base 11 are integrated into a whole and move left and right for a certain distance on the round shaft base 22, so that the front and back and left and right movement of the clamp opening base 11 can be realized, and the defect that the clamp opening base 11 can only be fixed at one end of the clamp body base 21 and cannot move is overcome.

The working process is as follows:

the middle swinging movable support 2 can realize the condition that a workpiece needs to be adjusted to transversely and longitudinally move for a certain distance to be machined in the machining process, and as the jaw base 11 is fixed on the clamp body base 21, when the jaw base 11 moves forwards or backwards for a certain distance, the jaw base 11 can longitudinally move for a certain distance on the clamp body base 21 and can be fixed at any time by screwing the positioning bolt 25 on each positioning block 24 on the side surface of the clamp body base 21. When the jaw base 11 needs to move laterally, the positioning bolts 25 on each positioning block 24 are firstly screwed down to fix the jaw base 11 on the caliper body base 21, the hexagon socket head cap screws 261 in the T-shaped blocks 26 on the shaft seat 22 are unscrewed, and then the caliper body base 21 is moved leftwards or rightwards to reach a proper machining cross section, and the hexagon socket head cap screws 261 in the T-shaped blocks 26 are screwed down to achieve the fixing purpose.

Swing up and down

When the machining is carried out, the workpiece is often required to be machined not only on a horizontal plane but also on an inclined plane, so that the workpiece needs to be adjusted to swing at different angles in the machining process to be machined. The action process of the invention for realizing up-and-down swinging is as follows:

the jaw base 11 is fixed on the surface of the jaw base 21, and when the jaw base 21 swings, the whole jaw and the swing angle of the workpiece fixed in the jaw can be realized. First, the shaft locking knob 272 is released, and the rotating shaft seat 22 swings to a desired angle, which can be displayed by the scale engraved on the shaft locking block 271. Pulling the knob 272 to be parallel to the circular shaft 222 again, rotating the bolt in the lock shaft block 271 to reduce the gap 2712, and locking and fixing the circular shaft 222 of the circular shaft seat 22; the locking shaft knob 272 is pulled again to be perpendicular to the circular shaft.

Horizontal rotation positioning

When the workpiece needs to be machined at a certain angle on the horizontal plane, the workpiece can be easily machined only by rotating the base 3 on the basis of clamping the workpiece.

The action process is as follows:

the lower rotary table 33 can rotate through a thrust ball bearing 37 arranged on the base 31; the fixed shaft sleeve seat 23 is arranged above the upper rotary table 32, and the lower part of the upper rotary table is fixed with the lower rotary table 33; when the base 31 is rotated to a fixed position, the rotating lever 35 is rotated slightly so that one of the pawls 34 catches the gear of the lower rotary plate 33 and the other pawl 34 is released. So that the entire rotating base 3 can be rotated. Meanwhile, the rotating rod 35 can rotate to the middle position after rotating for a proper angle according to the scale marked on the surface of the upper rotating disk 32, and the double pawls 34 lock the gear on the lower rotating disk 33 to prevent the gear from rotating and positioning, so that the purpose of the angle of horizontal rotation is achieved.

Example two:

the utility model provides a multi-functional flat-nose pliers, this flat-nose pliers is applicable to multistation clamping mode, and its structure all is the same embodiment one basically, and the difference lies in: the jaw mechanism 1 is different, as shown in fig. 32, the fixed jaw 12 and the sliding jaw 13 are respectively connected with a common fixed chuck 18 at opposite ends, and a movable fixed jaw 16 is further installed between the fixed jaw 12 and the sliding jaw 13; the movable fixed jaw 16 comprises a middle assembly 161 and a side plate 162, wherein a dovetail groove III 1611 is respectively arranged on two sides of the middle assembly 161, and various chucks, such as a fixed chuck 18, are mounted through the dovetail groove III 1611; the middle assembly 161 is connected to the side plate 162 by the tightening bolts 163 at both sides, and the side plate 162 has a hook 1621 at the bottom thereof, and the T-shaped boss i 111 of the jaw base 1 is hooked by the hook 1621.

The working principle of the movable fixed jaw in the second embodiment is as follows:

the movable fixed jaw 16 is composed of a middle assembly 161 and a side plate 162, various chucks can be mounted on the dovetail groove iii 1611 on both sides of the middle assembly 161, and the movable fixed jaw 16 can slide to any position on the jaw base 11 and be fixed. The clamping device can realize a plurality of station clamping modes and an increasing clamping mode, and makes up the defect that the fixed jaw 12 can only be fixed at one end of the jaw base 11.

The working process is as follows:

the middle assembly 161 is connected to the side plate 162 by screws, and the T-shaped boss i 111 on the jaw base 11 is hooked by the hook 1621 on the side plate 162, so that the movable fixed jaw 16 does not separate from the jaw base 11, but can slide on the movable fixed jaw. When a workpiece needs to be clamped, the fixed jaw 16 is firstly slid to a proper position to position the workpiece; when positioned, the bolts on both sides of the middle assembly 161 are tightened to force the side plates 162 toward the middle; under the condition that both sides are stressed, the side plate 162 can firmly clamp the T-shaped boss I111 of the jaw base 11; the movable fixed jaw 16 is fixed to the jaw base 11, and the clamping of the sliding jaw 13 can be performed.

The working principle of the jaw mechanism in the second embodiment is as follows:

the invention is provided with a sliding jaw 13 and a fixed jaw 12 at two ends of a jaw base 11, and one or more movable fixed jaws 16 in the middle. The mode is suitable for clamping a plurality of parts of the same type, and can clamp workpieces needing multi-step processing, so that a large amount of time is saved for processing.

The action process comprises the following steps:

(1) The sliding jaw 12 and the fixed jaw are moved first (the movement of the fixed jaw is referred to the working principle of the fixed jaw), so that a plurality of workpieces to be machined are positioned first at the jaw base 11.

(2) After the workpiece is positioned by the three jaws, the fastening screw 143 is tightened (referring to the clamping operation principle described in the first embodiment), so as to perform the coarse and fine clamping processes on the workpiece.

(3) And (5) processing.

Example three:

the utility model provides a work piece that multi-functional flat-nose pliers, this flat-nose pliers is applicable to and increases the clamping mode for clamping large-scale, other combination mode clamping. The structure of the multifunctional flat tongs in the third embodiment is basically the same as that in the second embodiment, except that: the jaw mechanism 1 is different, as shown in fig. 34, the jaw mechanism 1 of the third embodiment does not include the fixed jaw 12; and the top ends of the middle components 161 of the sliding jaw 13 and the movable fixed jaw 16 are also connected with a heightening block 17, and the heightening block 17 is a common technology.

As a variation of the third embodiment, the heightening block 17 may be provided with a clip.

The third embodiment describes the working principle of the jaw mechanism as follows:

(1) Firstly, the sliding jaw 13 and the movable fixed jaw 16 are moved to fix the movable fixed jaw 16 (refer to the working principle of the movable fixed jaw in the second embodiment); the workpiece to be machined is first positioned on the jaw base 11.

(2) After the workpiece is positioned by the two jaws, the fastening screw 143 is tightened (refer to the clamping working principle in the first embodiment), so as to realize the coarse and fine adjustment of the clamping process for the workpiece.

(3) And (5) processing.

Claims

1. A multifunctional flat-nose pliers comprises a jaw mechanism (1) for positioning and clamping a workpiece, wherein the jaw mechanism (1) comprises a jaw base (11), a fixed jaw (12) and a sliding jaw (13); the fixed jaw (12) is fixed at one end of the top of the jaw base (11), and the sliding jaw (13) is in sliding fit with the other end of the top of the jaw base (11); the method is characterized in that: the sliding jaw (13) clamps a workpiece through a quick clamping mechanism (14); the multifunctional flat tongs further comprise a middle swinging moving mechanism (2) for adjusting a swinging angle and performing fine tuning movement in the front, back, left and right directions and a rotating base (3) for rotating and positioning, wherein the tong opening mechanism (1) is arranged on the middle swinging moving mechanism (2), and the middle swinging moving mechanism (2) is arranged on the rotating base (3);

the quick clamping mechanism (14) comprises a bottom locking block (141), a hemispherical part (142) and a fastening bolt (143), wherein the bottom locking block (141) is integrally formed by a cam end (1411) positioned at the lower part and a cylindrical end (1412) positioned at the upper part, and the cam end (1411) of the bottom locking block (141) is obliquely and forwardly arranged in a cam sliding groove (113) arranged in the middle of the jaw base (11); positioning columns (1413) are respectively arranged on two sides of a cylindrical end (1412) of the bottom locking block (141), and threaded holes are formed in the cylindrical end (1412); a forward inclined semi-spherical part mounting through hole (131) is formed in the middle of the sliding jaw (13), and the semi-spherical part (142) is mounted in the semi-spherical part mounting through hole (131); the fastening bolt (143) obliquely penetrates through the hemispherical part (142) and is connected with the threaded hole of the bottom locking block (141) through threads; the front side and the rear side of the jaw base (11) are respectively provided with a plurality of arc groove bayonets (112), and the arc groove bayonets (112) are matched with the positioning columns (1413);

the middle swing moving mechanism (2) comprises a clamp body base (21), a round shaft seat (22) and a shaft sleeve seat (23); the clamp body base (21) is provided with a concave through groove (211) along the length direction, and the bottom of the clamp jaw base (11) is positioned in the concave through groove (211) and is in sliding fit with the concave through groove (211); two side walls of the concave through groove (211) are also connected with 7-shaped positioning blocks (24) along the top, and the side surfaces of the positioning blocks (24) are connected with positioning bolts (25) for providing clamping force into the concave through groove (211); the bottom of the caliper body base (21) is provided with a special-shaped groove (212) with two ends bent upwards along the width direction, a T-shaped groove (213) is arranged above the special-shaped groove (212), and a T-shaped block (26) which is connected with the caliper body base (21) and the circular shaft seat (22) through an inner hexagonal screw is arranged in the T-shaped groove (213); the top of the round shaft seat (22) is provided with a T-shaped boss III (221), and the T-shaped boss III (221) is in sliding fit with the special-shaped groove (212); two ends of the round shaft seat (22) are respectively provided with a round shaft (222); the shaft sleeve seats (23) are respectively positioned at the left side and the right side of the bottom of the clamp body base (21), the shaft sleeve seats (23) are rotatably connected with a round shaft (222) of a round shaft seat (22) and locked by a shaft locking mechanism (27), and the bottom ends of the shaft sleeve seats (23) are fixedly connected with the rotating base (3);

the rotary base (3) comprises a base (31), an upper rotary table (32), a lower rotary table (33), two pawls (34), a rotary rod (35), a spring (36) and a thrust ball bearing (37); the base (31) comprises a bottom plate (311) and a base (312) fixedly installed on the bottom plate (311), a bearing installation hole (3121) is formed in the base (312), and a lower rotary table installation annular groove (3122) and a rotary table installation annular groove (3123) are respectively formed in the periphery of the bearing installation hole (3121) from inside to outside; the base (312) is also provided with a notch (3124), and the top end of the notch (3124) is provided with a baffle plate (3125); one end of the thrust ball bearing (37) is arranged on the lower rotary table (33), and the other end of the thrust ball bearing (37) is arranged in a bearing mounting hole (3121) of the base (31); the lower rotary table (33) is arranged in a lower rotary table mounting annular groove (3122) of the base (31), and the top end of the lower rotary table (33) is fixedly connected with the bottom of the upper rotary table (32); the top of the upper rotating disc (32) is fixedly connected with the shaft sleeve seat (23), and the top surface of the upper rotating disc (32) is provided with scale marks; the rotating rod (35) is composed of a rotating ring (351) and a rod piece (352), the rotating ring (351) is installed in a rotating rod installation annular groove (3123) of the base (31), the rod piece (352) extends out of a notch (3124) of the base (312), and the rod piece (352) is respectively provided with a connecting rod I (353) and a connecting rod II (354); the connecting rod I (353) is respectively connected with one ends of the two pawls (34), and the other ends of the two pawls (34) are meshed with a rotating gear of the lower rotating disc (33); one end of the spring (36) is respectively connected to the two pawls (34), and the other end of the spring (36) is respectively connected to the connecting rod II (354).

2. The multi-functional flat-nose pliers according to claim 1, characterized in that: the opposite ends of the fixed jaw (12) and the sliding jaw (13) are respectively connected with a flexible binding clip module (15) for positioning profiles of surface members with different shapes; the flexible binding clip module (15) comprises a flexible binding clip base (151), a binding clip knob (152), a plurality of thimble assemblies (153), an upper pressing plate (154), a lower pressing plate (154), a left pressing plate (155), a right pressing plate (155) and a cover plate (156); the flexible tong head base (151) is respectively arranged at one end opposite to the fixed tong head (12) and the sliding tong head (13), the upper pressing plate and the lower pressing plate (154) are respectively arranged inside the upper end and the lower end of the flexible tong head base (151), the left pressing plate and the right pressing plate (155) are respectively arranged inside the left side and the right side of the flexible tong head base (151), the cover plate (156) is arranged inside the flexible tong head base (151), and the cover plate (156) is provided with thimble assembly mounting holes (1561) matched with a plurality of thimble assemblies (153); the clamp head rotary knob (152) is respectively installed at the upper end, the left side and the right side of the flexible clamp head module (15) through threads, and the tail ends of the threads of the clamp head rotary knob (152) are respectively tightly propped against the upper pressing plate (154), the lower pressing plate (154) and the left pressing plate (155); the ejector pin assemblies (153) are arranged in the ejector pin assembly mounting holes (1561) of the cover plate (156) according to a regular pattern.

3. The multi-functional flat-nose pliers according to claim 2, wherein: the thimble assembly (153) comprises a square locking rod (1531), a push rod (1532) and a reset spring (1533), wherein the front end of the push rod (1532) is a spherical contact head (15321) or a conical contact head (15322) or a square contact head (15323) which is in contact with a workpiece, the reset spring (1533) is sleeved at the middle part of the push rod (1532), the rear end of the push rod (1532) is connected with the square locking rod (1531) through a thread, and the square locking rod (1531) is regularly arranged in a thimble assembly mounting hole (1561) of the cover plate (156).

4. The multi-functional flat-nose pliers according to claim 1, characterized in that: the jaw mechanism also comprises a movable fixed jaw (16), the movable fixed jaw (16) comprises a middle component (161) and a side plate (162), and various chucks for clamping workpieces are arranged at the inner end of the middle component (161); the middle assembly (161) is connected with the side plate (162) through the tightening bolts (163) positioned on two sides, the bottom of the side plate (162) is provided with a convex hook (1621), and the jaw base (11) is hooked through the convex hook (1621).

5. The multi-functional flat-nose pliers according to claim 4, wherein: the jaw mechanism also comprises a heightening block (17), and the heightening block (17) is respectively arranged on the sliding jaw (13) and the middle assembly (161).

6. The multi-functional flat-nose pliers according to claim 1, characterized in that: the shaft sleeve seat (23) is also provided with a shaft locking block mounting groove (231); the shaft locking mechanism (27) comprises a shaft locking block (271) and a shaft locking knob (272), the shaft locking block (271) is installed in a shaft locking block installation groove (231) of the shaft sleeve seat (23) and is fixedly connected with the shaft sleeve seat (23) through a fastening piece, a circular shaft installation hole (2711) is formed in the middle of the upper end of the shaft locking block (271), an open groove (2712) is formed between the middle of the top end of the shaft locking block (271) and the middle of the top end of the circular shaft installation hole (2711), and scale marks are arranged around the upper half part of the circular shaft installation hole (2711); the lock shaft knob (272) is screwed on one side of the lock shaft block (271) through threads.