CN209949179U

CN209949179U - Simple and easy reliable general type centre gripping support

Info

Publication number: CN209949179U
Application number: CN201921113437.0U
Authority: CN
Inventors: 杨伟钊
Original assignee: Shenzhen City Naijia Electronics Co Ltd
Current assignee: Shenzhen City Naijia Electronics Co Ltd; Shenzhen Annaijia Electronics Co Ltd
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2020-01-14
Anticipated expiration: 2029-07-16

Abstract

The utility model discloses a simple and reliable universal clamping bracket, which comprises a shell and a clamping arm component arranged on the shell; the clamping arm assembly comprises two clamping arms extending out of the left side and the right side of the shell, and the two clamping arms are in linkage with each other through a linkage mechanism; a plurality of positioning racks are arranged on the clamping arm or the linkage mechanism, and the positioning racks are one-way ratchets; the clamping arm locking device also comprises a push switch used for locking the position of the clamping arm; the press switch comprises a swing rod, the swing rod is pivoted to the shell and provided with two swing arms which are respectively positioned on the left side and the right side of the pivoting position, and one swing arm is provided with a locking tooth which is adaptive to the positioning rack; when the pressing part is pressed, the other swing arm swings towards the side where the positioning rack is located, and the other swing arm swings away from the side where the positioning rack is located, so that the locking teeth are separated from the positioning rack to achieve unlocking; when the pressing part is not arranged, the locking tooth is clamped into the positioning rack, and the clamping arms move inwards to be closed when being applied with an inward acting force; therefore, the linkage mechanism has the advantages of simple structure, stable and reliable linkage and the like.

Description

Simple and easy reliable general type centre gripping support

Technical Field

The utility model belongs to the technical field of the support field technique and specifically relates to indicate a simple and easy reliable general type centre gripping support, its main nevertheless not restriction be used for the centre gripping location to mobile electronic products such as cell-phones.

Background

In the prior art, the clamping size is adjusted by limiting, locking or unlocking the clamping support, so that the clamping and positioning of mobile electronic products such as mobile phones with different sizes are met. However, the linkage mechanism has the disadvantages of complex structure, poor linkage reliability and the like, is not beneficial to controlling the product cost during production and manufacturing, and is easy to break down during use to influence the service performance of the product.

Therefore, a new technical solution needs to be developed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a simple and reliable universal clamping bracket, which has the advantages of simple structure, stable and reliable linkage, etc. in view of the deficiency of the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a simple and reliable universal clamping bracket comprises a shell and a clamping arm component arranged on the shell; the clamping arm assembly comprises two clamping arms extending out of the left side and the right side of the shell, and the two clamping arms are in linkage with each other through a linkage mechanism; a plurality of positioning racks are arranged on the clamping arm or the linkage mechanism, and the positioning racks are one-way ratchets;

the clamping arm locking device also comprises a push switch used for locking the position of the clamping arm; the pressing switch comprises a swing rod, the swing rod is pivoted to the shell, the swing rod is provided with two swing arms which are respectively positioned on the left side and the right side of the pivoting position, one swing arm is provided with a locking tooth which is adaptive to the positioning rack, the locking tooth is provided with a stop surface for limiting the clamp arm to move outwards and a guide surface for guiding the clamp arm to move inwards, and the other swing arm is connected with a pressing part and a first reset elastic element;

when the pressing part is pressed, the other swing arm swings towards the side where the positioning rack is located, and the other swing arm swings away from the side where the positioning rack is located, so that the locking teeth are separated from the positioning rack to achieve unlocking;

when the pressing part is not arranged, the locking teeth are clamped into the positioning rack under the action of the first reset elastic element on the other swing arm, the stop surface of the positioning rack is limited on the positioning rack to limit the clamping arms to move outwards, and when the clamping arms are subjected to inward acting force, the positioning rack acts on the guide surface of the locking teeth to enable the locking teeth to be separated from the positioning rack intermittently and the clamping arms to move inwards and get close.

As a preferred scheme, at least one clamping arm is connected with a third reset elastic element which drives the clamping arm to move outwards; one end of the third reset elastic element acts on the clamping arm, and the other end of the third reset elastic element acts on the shell; when the pressing part is pressed, the locking tooth is separated from the positioning rack for unlocking, and the clamping arm automatically opens outwards under the action force of the third reset elastic element. Preferably, the outer end of the clamping arm is provided with a lateral stopping portion, the lateral stopping portion is pivoted to the outer end of the clamping arm, and a second reset elastic element is connected between the lateral stopping portion and the clamping arm so that the lateral stopping portion can be elastically reset to turn outwards relative to the outer end of the clamping arm.

Preferably, the lateral stopping portion is pivotally connected to the outer end of the clamping arm through a pivot, the second elastic restoring element includes a torsion portion, and a first torsion arm and a second torsion arm respectively connected to two sides of the torsion portion, the torsion portion is sleeved on the pivot, the first torsion arm acts on the outer end of the clamping arm, and the second torsion arm acts on the lateral stopping portion.

As a preferable scheme, a soft rubber piece is arranged on the inner side of the lateral stopping portion, and the soft rubber piece is inwardly exposed on the inner side of the lateral stopping portion.

Preferably, the inner side of the lateral stopping portion is provided with a caulking groove, and the soft rubber member is detachably inserted into the caulking groove to achieve positioning.

Preferably, an access opening for taking and placing the clamped object is formed between the front ends of the lateral stopping parts of the two clamping arms, the front ends of the lateral stopping parts are provided with rotating parts rotating around the vertical axial direction, and the rotating parts are provided with rotating contact surfaces protruding out of the access opening.

As a preferable scheme, the first reset elastic element is a compression spring, the upper end of the first reset elastic element acts on the lower end of the other swing arm, and the lower end of the first reset elastic element acts on the shell; the locking tooth is connected to the lower end of a swing arm;

the shell is internally provided with a limiting wall which extends leftwards and rightwards and is used for positioning the clamping arm, and the lower end of the first reset elastic element is abutted against the limiting wall.

As a preferred scheme, the link gear is including the rotor, the rotor pin joint is in the casing, just, the rotor has the upside swinging boom that is located pin joint position upper end and is located the downside swinging boom of pin joint position lower extreme, and the inner of two arm lock is pin joint respectively in upside swinging boom, downside swinging boom.

As a preferred scheme, the linkage mechanism comprises a gear, and the two clamping arms are respectively meshed with the upper side and the lower side of the gear.

As a preferred scheme, the linkage mechanism comprises a gear disc, wherein the gear disc comprises a second gear and a first ratchet disc which are concentrically arranged and connected with each other; the two clamping arms are respectively meshed with the upper side and the lower side of the second gear, and the positioning rack is arranged on the periphery of the first ratchet plate. Compared with the prior art, the utility model has obvious advantages and beneficial effects, concretely speaking, known from the above technical scheme, it is mainly through the structural improvement to the press switch, make the structure of press switch become simple, press switch's operation is more smooth and easy, press switch is stable and reliable to the linkage of arm lock or link gear, difficult breaking down when using, and, press switch's structural simplification also is favorable to the cost control of product;

secondly, the lateral stopping part is arranged at the outer end of the clamping arm, and the lateral stopping part can be elastically reset to turn outwards relative to the outer end of the clamping arm, so that the clamped object can be conveniently taken and placed;

moreover, the soft rubber piece is arranged on the clamping arm, and the soft rubber piece is utilized to form non-rigid contact with the clamped object, so that the clamped object is prevented from being damaged by clamping, and meanwhile, the soft clamping also increases the clamping friction force and the clamping stability of the bracket on the clamped object;

and the front end of the lateral stopping part is provided with a rotating part which rotates around the vertical axial direction, so that when the clamped object is taken and placed, the rotating part provides a rotating contact surface, and the taking and the placing become smoother.

To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is an assembled view of a first embodiment of the present invention;

FIG. 2 is a diagram illustrating an exploded structure of a first embodiment of the present invention;

FIG. 3 is a cross-sectional view of a first embodiment of the present invention;

fig. 4 is a partial structural view of a second embodiment of the present invention (mainly embodying another design situation of the second restoring elastic element);

fig. 5 is a partial structural view (mainly showing the structure of the push switch) of the first embodiment of the present invention;

fig. 6 is a diagram illustrating a linkage relationship between the push switch and the clamp arm according to the first embodiment of the present invention;

fig. 7 is a diagram showing the linkage relationship between the push switch and the clamp arm according to the third embodiment of the present invention;

fig. 8 is a diagram illustrating a linkage relationship between the push switch and the clamp arm according to a fourth embodiment of the present invention;

fig. 9 is a diagram showing a linkage relationship between the push switch and the linkage mechanism according to the fifth embodiment of the present invention;

fig. 10 is a diagram showing the linkage relationship between the push switch and the linkage mechanism according to the sixth embodiment of the present invention.

The attached drawings indicate the following:

limiting wall 11 of shell 10

Front case 101 and rear case 102

Clamping arm 20 positioning rack 201

Side stop 21 nest 211

Torsion body 221 of second reset elastic element 22

First torque arm 222 and second torque arm 223

Pin 23 flexible glue 24

Inner end contact portion 242 of outer end embedded portion 241

Access 25 rotor 26

Third restoring spring element 27 of the rotary contact surface 261

Push switch 30 swing link 31

Swing arm 311 locking tooth 3111

Stop surface 3112 guide surface 3113

The pressing portion 312 is a first elastic restoring element 313

Upper rotary arm 41 of rotary sheet 40

First gear 50 of lower side rotating arm 42

Turntable 60 gear wheel 70

Second gear 71 first ratchet plate 72

A second ratchet plate 80.

Detailed Description

Referring to fig. 1 to 10, specific structures of various embodiments of the present invention are shown. A simple and reliable universal clamping bracket comprises a shell 10 and a clamping arm component arranged on the shell 10; the housing 10 includes a front case 101 and a rear case 102 assembled with each other. The clamping arm assembly comprises two clamping arms 20 extending out of the left side and the right side of the shell 10, and the two clamping arms 20 are mutually linked through a linkage mechanism; in the following, specific design cases of several kinds of link mechanisms are listed, and in the actual design, the number is not limited to these, and other possible link mechanisms may be adopted.

A plurality of positioning racks 201 are arranged on the clamping arm 20 or the linkage mechanism, and the positioning racks 201 are one-way ratchets; the device also comprises a push switch 30 for locking the position of the clamping arm 20; the push switch 30 includes a swing link 31, the swing link 31 is pivoted to the housing 10, the swing link 31 has two swing arms 311 respectively located at the left and right sides of the pivot, one swing arm 311 has a locking tooth 3111 adapted to the positioning rack 201, the locking tooth 3111 has a stop surface 3112 for limiting the outward movement of the clamp arm 20 and a guide surface 3113 for guiding the inward movement of the clamp arm 20, and the other swing arm 311 is connected with a pressing portion 312 and a first return elastic element 313; the shape of the spacing groove between adjacent positioning splines 201 preferably matches the shape of the locking teeth 3111.

When the pressing portion 312 is pressed, the other swing arm 311 swings toward the side where the positioning rack 201 is located, and the one swing arm 311 swings away from the side where the positioning rack 201 is located, so that the locking tooth 3111 is separated from the positioning rack 201 to achieve unlocking;

when the pressing portion 312 is not provided, under the action of the first elastic return element 313 on the other swing arm 311, the locking tooth 3111 is clamped into the positioning rack 201, the stop surface 3112 of the locking tooth 3111 is limited on the positioning rack 201 to limit the outward movement of the clamping arm 20, and when the clamping arm 20 is subjected to an inward acting force, the positioning rack 201 acts on the guide surface 3113 of the locking tooth 3111 to intermittently disengage the locking tooth 3111 from the positioning rack 201 and move the clamping arm 20 inward and close.

Preferably, the outer ends of the clamping arms 20 have lateral stoppers 21, the lateral stoppers 21 are pivoted to the outer ends of the clamping arms 20, and a second elastic return element 22 is connected between the lateral stoppers 21 and the clamping arms 20, so that the lateral stoppers 21 can be elastically and resiliently turned outwards relative to the outer ends of the clamping arms 20. The lateral stopping portion 21 is pivotally connected to the outer ends of the clipping arms 20 by the pivot shaft 23, the second return elastic element 22 has a torsion portion 221, and a first torsion arm 222 and a second torsion arm 223 respectively connected to both sides of the torsion portion 221, the torsion portion 221 is sleeved on the pivot shaft 23, the first torsion arm 222 acts on the outer ends of the clipping arms 20, and the second torsion arm 223 acts on the lateral stopping portion 21.

Generally, the second return elastic element 22 may be a torsion spring or a spring plate, as shown in fig. 2 and 4; preferably, a first groove for positioning the first torsion arm 222 is provided at the outer end of the clamping arm 20, and a second groove for positioning the second torsion arm 223 is provided at the inner side of the lateral stop 21.

Also, the inner side of the lateral stop 21 is provided with a soft rubber 24, such as: silicone pieces, etc.; the soft rubber piece 24 is inwardly exposed from the inner side of the lateral stopping portion 21 to form non-rigid contact with the object to be clamped. The inner side of the lateral stopping portion 21 is provided with an embedding groove 211, and the soft rubber member 24 is detachably embedded in the embedding groove 211 to achieve positioning. Here, the left and right cross-sections of the rubber member 24 are T-shaped, and the rubber member has an outer end fitting portion 241 and an inner end contact portion 242 integrally connected to the inner end of the outer end fitting portion 241, the outer end fitting portion 241 is fitted into the fitting groove 211, and the inner end contact portion 242 is protruded to the inside of the side stopper portion 21.

An access 25 for taking and placing the clamped object is formed between the front ends of the lateral stopping portions 21 of the two clamping arms 20, the front ends of the lateral stopping portions 21 are provided with rotating members 26 which rotate around the vertical axial direction, and the rotating members 26 have rotating contact surfaces 261 which are exposed out of the access 25 so as to facilitate the taking and placing of the clamped object. Of course, the arrangement of the rotating part 26 also plays a role in limiting the front sides of the mobile phone and the like, so that the mobile phone placed in the support is more stable. The rotating member 26 may be a roller, a ball, a roller, or other structures capable of rotating, and mainly guides the mobile phone to slide in or out by using a rotating contact surface, so as to improve the smoothness of taking and placing the mobile phone.

The first elastic reset element 313 is a compression spring, the upper end of which acts on the lower end of the other swing arm 311, and the lower end of which acts on the shell 10; the locking tooth 3111 is connected to the lower end of a swing arm 311; here, a limiting wall 11 extending left and right for positioning the clip arm 20 is provided in the housing 10, and the lower end of the first elastic return element 313 abuts against the limiting wall 11, which corresponds to skillfully utilizing the limiting wall 11 as the lower end abutment portion of the first elastic return element 313.

As shown in fig. 2 and 6, the positioning rack 201 is disposed on the clamping arm 20; the linkage mechanism comprises a rotating piece 40, the rotating piece 40 is pivoted to the shell 10, the rotating piece 40 is provided with an upper side rotating arm 41 positioned at the upper end of the pivoting position and a lower side rotating arm 42 positioned at the lower end of the pivoting position, and the inner ends of the two clamping arms 20 are respectively pivoted to the upper side rotating arm 41 and the lower side rotating arm 42. Specifically, the left arm lock 20 pin joint in upside swinging boom 41, the arm lock 20 pin joint in downside swinging boom 42 on right side, here, are provided with the bar groove respectively at upside swinging boom 41, downside swinging boom 42, and two arm locks 20 stretch into corresponding bar inslot through first spliced pole, and first spliced pole is less than the bar groove to make first spliced pole have certain relative home range in the bar inslot. Thus, when the clamping arm 20 on the left side is pulled outwards, the upper rotating arm 41 rotates leftwards, and simultaneously, the lower rotating arm 42 rotates rightwards, so that the clamping arm 20 on the right side is linked to be pulled outwards; similarly, when the left arm clamp 20 moves inward, the upper rotating arm 41 rotates to the right, and at the same time, the lower rotating arm 42 rotates to the left, and the right arm clamp 20 moves inward in conjunction with the rotation.

As shown in fig. 8, the linkage mechanism is a rotating disc 60, in fact, the rotating disc 60 shown in fig. 8 is similar to the rotating plate 40 shown in the figure, the rotating disc 60 and the rotating plate 40 are mainly different in shape, the rotating disc 60 is also pivoted to the housing 10, two rotating points arranged up and down are also provided on the rotating disc 60 for the corresponding left and right clamping arms 20 to form the linkage point, and therefore, it can also be understood that: the upper side rotating arm and the lower side rotating arm of the turntable 60 are in a semicircular structure. The operation principle of the structure shown in fig. 8 is substantially the same as that of fig. 6, and will not be described again.

In fig. 7, the linkage mechanism includes a first gear 50, and the two clamping arms 20 are respectively engaged with the upper and lower sides of the first gear 50.

In the embodiments shown in fig. 6 to 8, the clamping arm 20 is linked by pressing a switch, that is, a plurality of positioning racks 201 are disposed on the clamping arm 20.

As shown in fig. 9 and 10, the positioning rack 201 is provided on the linkage mechanism, specifically:

the linkage mechanism shown in fig. 9 comprises a gear plate 70, wherein the gear plate 70 comprises a second gear 71 and a first ratchet plate 72 which are concentrically arranged and connected with each other; the two clamping arms 20 are respectively meshed with the upper side and the lower side of the second gear 71, the positioning rack 201 is arranged on the periphery of the first ratchet plate 72, and the locking teeth 3111 of the push switch 30 are adapted to the positioning rack 201 on the periphery of the first ratchet plate 72. When the clamping arm 20 moves inwards, the second gear 71 is linked to rotate clockwise, and the second gear 71 is simultaneously linked with the other clamping arm 20 to move inwards; the first ratchet plate 72 and the second gear 71 rotate in the same direction, and the lock teeth 3111 of the push switch 30 are intermittently unlocked from the first ratchet plate 72 by the positioning rack 201 of the first ratchet plate 72. When the push switch 30 is unlocked and the clip arm 20 is pulled outward, the first ratchet plate 72 cannot rotate and the second gear 71 cannot rotate due to the locking of the locking teeth 3111 and the first ratchet plate 72, so that the clip arm 20 cannot be pulled outward. The gear plate 70 is provided with a simple structure, and is easy to install and position, and particularly, the second gear 71 and the first ratchet plate 72 are concentrically provided and connected with each other, the linkage between the two clamping arms 20 is more stable, the synchronism is good, when the clamping arms 20 are pulled inwards, the straight teeth on the clamping arms 20 are directly meshed with the second gear 71, the rotation of the first ratchet plate 72 is completely synchronous with the second gear 71, the first ratchet plate 72 is smoother and more reliable to the linkage of the press switch 30, and similarly, when the press switch 30 locks the first ratchet plate 72, the second gear 71 is equivalently and directly locked, the locking effect on the clamping arms 20 is good, and therefore, the gear plate 70 is used as a linkage mechanism, and the smooth inward folding operation of the clamping arms 20 can be better ensured, and the clamping of the clamping arms 20 to the clamped object is kept reliable.

The linkage mechanism shown in fig. 10 includes a second ratchet plate 80, the second ratchet plate 80 is pivotally connected to the housing 10, two rotation points are disposed on the second ratchet plate 80, and the two rotation points are disposed up and down, so that the corresponding left and right clamping arms 20 form a linkage point, which corresponds to that the structure of the rotating plate 40 shown in fig. 6 is changed into the second ratchet plate 80 shown in fig. 10, and the linkage relationship and principle between the second ratchet plate 80 and the two clamping arms 20 are substantially the same as those shown in fig. 6 and 8, which mainly differs in that the positioning rack 201 is disposed on the periphery of the second ratchet plate 80.

It should be noted that the clamping arm 20 can be pulled apart manually, and can also be opened automatically by using the elastic restoring force; preferably, at least one of the clamping arms 20 is connected with a third elastic return element 27 for driving the clamping arm 20 to move outwards; one end of the third elastic resetting element 27 acts on the clamping arm 20, and the other end acts on the shell 10; when the pressing portion 312 is pressed, the locking tooth 3111 is disengaged from the positioning rack 201 to be unlocked, and then the clamping arm 20 is automatically opened outward by the force of the third restoring elastic element 27, so that the convenience of operation is improved.

Next, a procedure for using the holding bracket will be described in general:

in the initial state, the bracket is in a clamping state;

when an object to be clamped, such as a mobile phone, is required to be placed, the press switch 30 is pressed first, and the clamping arm 20 automatically opens outwards under the action of the third reset elastic element 27;

the mobile phone is put in, the clamping arms 20 are inwards squeezed by one hand, and the clamping arms 20 on the left side and the right side are inwards folded and disturbed to clamp the mobile phone; because the clamping arm 20 is in the folding process, the intermittent unlocking process between the press switch 30 and the clamping arm 20 or the linkage mechanism is also referred to as the 'unlocking-locking' continuous switching cycle process, when the clamping arm 20 is folded to any position and the hand is released, the clamping arm 20 locks the current size, and the support can also be understood as 'memorizing' the size of the currently clamped mobile phone;

when the mobile phone needs to be taken out, the lateral stopping part 21 on one side is tilted, so that the lateral stopping part 21 is outwards turned relative to the outer end of the clamping arm 20, and the mobile phone slides out along with the rotation of the rotating part 26 through the rolling type contact between the rotating part 26 and the mobile phone;

when the mobile phone needs to be put in next time, if the size of the placed mobile phone is the same as that of the mobile phone at the last time, the size of the support does not need to be adjusted any more, the lateral stopping part 21 on one side is directly tilted, so that the lateral stopping part 21 is outwards turned relative to the outer end of the clamping arm 20, one side of the mobile phone is put in an inclined manner, and the other side of the mobile phone is pressed to slide in along with the rotation of the rotating part 26 through rolling contact between the rotating part 26 and the other side of the mobile phone;

of course, no matter whether the next mobile phone is the same size as the previous mobile phone, the pressing switch 30 can be pressed to automatically open the two clamping arms 20, then the mobile phone is placed in, and then the clamping arms 20 are manually folded inwards to clamp the mobile phone.

If the third elastic return element 27 is not provided, the push switch 30 is pressed during operation, and the other hand pulls the clip arm 20 outward at the same time of pressing, so as to pull the clip arm to a corresponding width as required.

Also, as for the connection of the post with the groove (hole), the position can be interchanged at the time of actual design; and the positions of the pivot shaft and the corresponding pivot hole can be exchanged, and these equivalent changes are not described again.

To sum up, the utility model discloses a design focus lies in:

the structure of the press switch is improved, so that the structure of the press switch is simple, the operation of the press switch is smoother, the linkage of the press switch to the clamping arm or the linkage mechanism is stable and reliable, the press switch is not easy to break down when in use, and the structure simplification of the press switch is also beneficial to the cost control of products;

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a simple and easy reliable general type centre gripping support which characterized in that: comprises a shell (10) and a clamping arm component arranged on the shell (10); the clamping arm assembly comprises two clamping arms (20) extending out of the left side and the right side of the shell (10), and the two clamping arms (20) are mutually linked through a linkage mechanism; a plurality of positioning racks (201) are arranged on the clamping arm (20) or the linkage mechanism, and the positioning racks (201) are one-way ratchets;

the clamp also comprises a push switch (30) for locking the position of the clamping arm (20); the push switch (30) comprises a swing rod (31), the swing rod (31) is pivoted to the shell (10), the swing rod (31) is provided with two swing arms (311) which are respectively positioned on the left side and the right side of the pivoting position, one swing arm (311) is provided with a locking tooth (3111) which is matched with the positioning rack (201), the locking tooth (3111) is provided with a stop surface (3112) for limiting the outward movement of the clamping arm (20) and a guide surface (3113) for guiding the inward movement of the clamping arm (20), and the other swing arm (311) is connected with a pressing part (312) and a first reset elastic element (313);

when the pressing part (312) is pressed, the other swing arm (311) swings towards the side where the positioning rack (201) is located, and the swing arm (311) swings away from the side where the positioning rack (201) is located so that the locking tooth (3111) is separated from the positioning rack (201) to achieve unlocking;

when the pressing part (312) is not arranged, under the action of the first reset elastic element (313) on the other swing arm (311), the locking tooth (3111) is clamped into the positioning rack (201), the stop surface (3112) of the locking tooth is limited on the positioning rack (201) to limit the outward movement of the clamping arm (20), and when the clamping arm (20) is acted by an inward acting force, the positioning rack (201) acts on the guide surface (3113) of the locking tooth (3111) to enable the locking tooth (3111) to be intermittently separated from the positioning rack (201) and the clamping arm (20) to move inwards and approach.

2. A simple and reliable universal gripping bracket according to claim 1, characterized in that: at least one clamping arm (20) is connected with a third reset elastic element (27) which drives the clamping arm (20) to move outwards; one end of the third reset elastic element (27) acts on the clamping arm (20), and the other end of the third reset elastic element acts on the shell (10); when the pressing part (312) is pressed, the locking tooth (3111) is separated from the positioning rack (201) to be unlocked, and the clamping arm (20) automatically opens outwards under the action of the third reset elastic element (27).

3. A simple and reliable universal gripping bracket according to claim 1, characterized in that: the outer end of the clamping arm (20) is provided with a lateral stopping portion (21), the lateral stopping portion (21) is pivoted to the outer end of the clamping arm (20), and a second reset elastic element (22) is connected between the lateral stopping portion (21) and the clamping arm (20) so that the lateral stopping portion (21) can be elastically reset to turn outwards relative to the outer end of the clamping arm (20).

4. A simple and reliable universal gripping bracket according to claim 3, characterized in that: the lateral stopping portion (21) is pivoted to the outer end of the clamping arm (20) through a pivoting shaft (23), the second reset elastic element (22) is provided with a twisting body portion (221) and a first torsion arm (222) and a second torsion arm (223) which are respectively connected to two sides of the twisting body portion (221), the twisting body portion (221) is sleeved on the pivoting shaft (23), the first torsion arm (222) acts on the outer end of the clamping arm (20), and the second torsion arm (223) acts on the lateral stopping portion (21).

5. A simple and reliable universal gripping bracket according to claim 3, characterized in that: the inner side of the lateral stopping portion (21) is provided with a soft rubber piece (24), and the soft rubber piece (24) is inwards exposed out of the inner side of the lateral stopping portion (21).

6. A simple and reliable universal clamping bracket according to claim 5, characterized in that: the inner side of the lateral stopping part (21) is provided with an embedding groove (211), and the soft rubber piece (24) is detachably embedded into the embedding groove (211) to achieve positioning.

7. A simple and reliable universal gripping bracket according to claim 3, characterized in that: an access opening (25) for taking and placing clamped objects is formed between the front ends of the lateral stopping parts (21) of the two clamping arms (20), a rotating part (26) rotating around the vertical axial direction is arranged at the front end of the lateral stopping part (21), and the rotating part (26) is provided with a rotating contact surface (261) protruding out of the access opening (25).

8. A simple and reliable universal gripping bracket according to claim 1, characterized in that: the first reset elastic element (313) is a compression spring, the upper end of the first reset elastic element acts on the lower end of the other swing arm (311), and the lower end of the first reset elastic element acts on the shell (10); the locking tooth (3111) is connected to the lower end of a swing arm (311);

a limiting wall (11) which extends leftwards and rightwards and is used for positioning the clamping arm (20) is arranged in the shell (10), and the lower end of the first reset elastic element (313) abuts against the limiting wall (11).

9. A simple and reliable universal gripping bracket according to claim 1, characterized in that: the link gear is including rotor (40), rotor (40) pin joint in casing (10), just, rotor (40) have upside swinging boom (41) that are located pin joint position upper end and downside swinging boom (42) that are located pin joint position lower extreme, and the inner of two arm lock (20) pin joint respectively in upside swinging boom (41), downside swinging boom (42).

10. A simple and reliable universal gripping bracket according to claim 1, characterized in that: the linkage mechanism comprises a first gear (50), and the two clamping arms (20) are respectively meshed with the upper side and the lower side of the first gear (50).

11. A simple and reliable universal gripping bracket according to claim 1, characterized in that: the linkage mechanism comprises a gear disc (70), and the gear disc (70) comprises a second gear (71) and a first ratchet disc (72) which are concentrically arranged and connected with each other; the two clamping arms (20) are respectively meshed with the upper side and the lower side of the second gear (71), and the positioning rack (201) is arranged on the periphery of the first ratchet plate (72).