CN214641883U - Composite material tool clamping device - Google Patents

Abstract

The utility model provides a composite material tool clamping device, which comprises a tool fixing part and a zero point clamp; the fixture fixing part comprises a fixing plate and a first connecting column connected with the fixing plate; the top end of the first connecting column is provided with a jack; the zero point clamp comprises a clamping bracket and a connecting part connected to the bottom of the clamping bracket; the bottom end of the connecting part is provided with a plurality of telescopic limiting balls; and an air channel communicated with the connecting part is arranged in the clamping support and is connected with an air source. The utility model provides a combined material frock clamping device links to each other with the combined material frock through the fixed plate, realizes pressing from both sides tightly the combined material frock, can enlarge this combined material frock clamping device's application range, reduces the quantity of required anchor clamps, not only is favorable to the simplified operation, and convenient to use is favorable to reduce cost moreover.

Description

Composite material tool clamping device

Technical Field

The utility model relates to a combined material technical field particularly, relates to a combined material frock clamping device.

Background

At present, the composite material is applied to commercial aviation airplanes in a large scale, and the overall structure weight of the airplane is greatly reduced by utilizing the advantages of high specific strength, high specific stiffness, strong designability and the like of the advanced composite material; the composite material structure design of the commercial aircraft tends to be more and more complicated, and a complex and various composite material tool structure is formed.

In the processing and manufacturing process, after the composite material is formed, the composite material can be formed into finished parts only by carrying out mechanical processing such as cutting, drilling, turning and the like; in the machining process, the composite material tool is generally required to be clamped, transported and the like.

Because the variety of combined material frock is more, and the structure difference is great, clamp through designing the anchor clamps of different models come to press from both sides the combined material frock of different structures at present usually, lead to the anchor clamps that need a lot more, not only inconvenient to use, and the cost is higher.

SUMMERY OF THE UTILITY MODEL

The utility model provides a problem be that the combined material frock of present not isostructure needs the anchor clamps of different models to press from both sides tightly.

In order to solve the problems, the utility model provides a composite material tool clamping device, which comprises a tool fixing part and a zero point clamp; wherein the content of the first and second substances,

the fixture fixing part comprises a fixing plate and a first connecting column connected with the fixing plate;

the top end of the first connecting column is provided with a jack;

the zero point clamp comprises a clamping bracket and a connecting part connected to the bottom of the clamping bracket; the bottom end of the connecting part is provided with a plurality of telescopic limiting balls;

the limiting balls are suitable for being inserted into the jack, so that the fixture fixing part is connected with the zero point clamping device;

a gas channel communicated with the connecting part is arranged in the clamping bracket and is connected with a gas source;

through the opening and closing of the air source, the telescopic state of the plurality of limiting balls is controlled, and then the connection and the release of the tool fixing part and the zero point clamping device are controlled.

Optionally, the limiting ball is a steel ball.

Optionally, the connecting part comprises a second connecting column and a jacket sleeved outside the second connecting column, and the second connecting column is slidably connected in the jacket along the vertical direction; the clamping sleeve is fixedly connected with the clamping support, and the gas channel is communicated with the clamping sleeve; the outer wall of the jacket is provided with an air hole, the gas channel is connected with the air hole, and the height of the air hole is higher than the upper end surface of the second connecting column; a plurality of limiting holes are formed in the circumference of the jacket, and the limiting balls are arranged in the limiting holes; the inner diameter of the limiting hole is smaller than the outer diameter of the limiting ball; and the outer wall of the second connecting column is provided with a plurality of limiting grooves matched with the limiting balls.

Optionally, a first sealing ring is arranged between the clamping sleeve and the clamping bracket.

Optionally, the connecting portion further comprises a spring, and the second connecting column is connected with the jacket through the spring.

Optionally, the zero point clamp further comprises a adapter sleeve, and the adapter sleeve is arranged on the outer side of the clamping bracket.

Optionally, a second sealing ring is arranged between the clamping bracket and the adapter sleeve.

Optionally, the zero point clamp further comprises a pressure sensor connected above the clamping bracket.

Optionally, a limiting bump is arranged on the inner wall of the insertion hole.

Optionally, a connecting hole is formed in the fixing plate, a limiting plate is connected to the bottom end of the first connecting column, and the limiting plate is suitable for being inserted into the connecting hole, so that the first connecting column is connected with the fixing plate.

Compared with the prior art, the utility model provides a combined material frock clamping device has following advantage:

the utility model provides a combined material frock clamping device links to each other with combined material frock through the fixed plate, realizes the clamp of combined material frock, convenient operation not only, and this fixed plate can select suitable position to install on the combined material frock of multiple structural shape moreover to can enlarge this combined material frock clamping device's application range, reduce the quantity of required anchor clamps, not only be favorable to simplifying operation, convenient to use is favorable to reduce cost moreover.

Drawings

FIG. 1 is a schematic view of a composite material tooling clamping device according to the present invention;

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

FIG. 3 is a schematic structural diagram of a composite material tooling clamping device according to the present invention;

fig. 4 is a schematic structural diagram three of the composite material tooling clamping device of the present invention;

FIG. 5 is a schematic view of a first connecting post according to the present invention;

fig. 6 is a schematic view of the structure of the middle fixing plate of the present invention.

Description of reference numerals:

1-a fixture fixing part; 11-a fixed plate; 111-connection hole; 12-a first connecting post; 121-a jack; 122-a limit bump; 123-a limiting plate; 2-zero point clamp; 21-clamping the bracket; 211-gas channel; 212-a second sealing ring; 22-a connecting part; 221-a limit ball; 222-a second connecting column; 2221-a limit groove; 223-jacket; 2231-limiting holes; 2232-a first sealing ring; 2233-pores; 224-a spring; 23-a adapter sleeve; 24-a pressure sensor; 3-composite material tooling; 4-lifting device.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for the purpose of simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first" and "second" are used merely to simplify the description and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present disclosure, unless otherwise expressly stated or limited, a first feature "on" or "under" a first feature may comprise the first feature and a second feature in direct contact, or may comprise the first feature and the second feature not in direct contact but in contact with each other through another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "below," and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or merely indicates that the first feature is at a lower level than the second feature.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In order to solve the problems that the composite material tooling with different structures needs clamps with different models for clamping, so that the number of the clamps is large, the use is inconvenient, and the cost is high, the utility model provides a composite material tooling clamping device, which is shown in figures 1 to 6 and comprises a tooling fixing part 1 and a zero point clamp 2; the fixture fixing part 1 is used for being connected with a composite material fixture 3 to be clamped, and the zero point clamp 2 is used for being connected with the lifting device 4.

Specifically, the fixture fixing part 1 comprises a fixing plate 11 and a first connecting column 12 connected with the fixing plate 11; the bottom of the preferred fixed plate 11 of this application links to each other with combined material frock 3, the upper end with fixed plate 11 is connected to the bottom of first connector strut 12, fixed plate 11 links to each other with binding clasp 2 at zero point through first connector strut 12 to in drive fixed plate 11 through the hoisting device 4 that links to each other with binding clasp 2 at zero point and remove, and then drive combined material frock 3 through fixed plate 11 and remove, the realization is to the clamp of combined material frock 3 and transport.

The fixing plate 11 is preferably connected with the composite material tool through a fastener; in order to be connected with the zero point clamping device 2, the top end of the first connecting column 12 is provided with an insertion hole 121; correspondingly, the zero point clamp 2 connected with the zero point clamp comprises a clamping bracket 21 and a connecting part 22 connected to the bottom of the clamping bracket 21; the bottom end of the connecting part 22 is provided with a plurality of telescopic limiting balls 221; the limiting balls 221 are suitable for being inserted into the insertion holes 121, so that the connection between the tool fixing part 1 and the zero point clamping device 2 is realized; a gas channel 211 communicated with the connecting part 22 is arranged in the clamping bracket 21, and the gas channel 211 is connected with a gas source; the expansion state of the limiting balls 221 is controlled by opening and closing the air source, so that the connection and the release of the tool fixing part 1 and the zero point clamp 2 are controlled.

Specifically, the preferred air source of the present application is a compressed air source; when the air source is started, compressed air enters the connecting part 22 through the air passage 211, so that the pressure in the connecting part 22 is increased; when the air source is closed, the pressure in the connecting part 22 is recovered to normal pressure; further, the positions of the plurality of stopper balls 221 are changed by the change of the pressure in the connecting portion 22, thereby extending and contracting the stopper balls 221.

Referring to fig. 1 and 2, a plurality of limiting balls 221 are uniformly distributed on the same circumference; the number of the limiting balls 221 is at least two, and the specific number is determined according to the requirement; the stretching state of the limiting balls 221 in the present application specifically means that the limiting balls 221 are located at positions on the circumference; when the distance between the center of the limiting ball 221 and the center of the circle is far, the limiting ball 221 is in an extending state, and as can be seen from the figure, when the limiting balls 221 are in the extending state, the outer diameter of the circle formed by the limiting balls 221 is larger; on the contrary, when the center of the limiting ball 221 is closer to the center of the circle, the limiting ball 221 is in a retracted state, and as can be seen from the drawing, when the limiting balls 221 are in the retracted state, the outer diameter of the circle formed by the limiting balls 221 is smaller.

In order to facilitate the connection between the fixture fixing part 1 and the zero point clamp 2 and improve the connection strength between the fixture fixing part and the zero point clamp, when the plurality of limiting balls 221 are all in a contraction state, the outer diameter of the circumference where the limiting balls are located is smaller than the inner diameter of the insertion hole 121; when the plurality of limiting balls 221 are in the extending state, the outer diameter of the circumference where the limiting balls 221 are located is larger than the inner diameter of the insertion hole 121, so that interference fit is formed between the plurality of limiting balls 221 in the extending state and the insertion hole 121, and clamping is achieved.

In the working process of the composite material tool clamping device, after the fixing plate 11 is connected with the composite material tool 3 to be clamped, the plurality of limiting balls 221 are controlled to be in a retraction state through the air source, at the moment, the outer diameter of the circumference where the plurality of limiting balls 221 are located is smaller, as shown in fig. 3, the plurality of limiting balls 221 on the connecting part 22 are inserted into the insertion hole 121, then the plurality of limiting balls 221 are controlled to be in an extension state through the air source, at the moment, the plurality of limiting balls 221 are abutted against and clamped with the inner wall of the insertion hole 121, and the connection between the tool fixing part 1 and the zero point clamping device 2 is realized; after the composite material tool 3 is transferred to a designated position through the lifting device, the plurality of limiting balls 221 are controlled to be in a contraction state through the air source, the outer diameter of the circumference where the limiting balls 221 are located is reduced, the zero point clamp 2 is lifted, the connecting portion 22 can be taken out of the jack 121, and the separation of the tool fixing portion 1 and the zero point clamp 2 is completed.

The utility model provides a combined material frock clamping device links to each other with combined material frock 3 through fixed plate 11, realizes the clamp of combined material frock 3 tightly, convenient operation not only, and this fixed plate 11 can select suitable position to install on the combined material frock of multiple structural shape moreover to can enlarge this combined material frock clamping device's application range, reduce the quantity of required anchor clamps, not only be favorable to simplifying the operation, convenient to use, and be favorable to reduce cost moreover.

In addition, the existing composite material tool is complex in shape and structure and often comprises a plurality of product appearance surfaces; when the existing clamp clamps the composite material tool 3, the composite material tool is generally required to be in contact with the appearance surface, so that the appearance surface is easily damaged in the transferring process, and the product quality is influenced; according to the composite material tool clamping device, when the composite material tool 3 is clamped and transported, the fixing plate 11 occupies a small space and can be flexibly arranged at any appointed position on the composite material tool 3; therefore, the fixing plate 11 is mounted on the non-appearance surface of the composite material tool 3, so that damage to the appearance surface of the product in the transfer process can be avoided, and the attractiveness and the product quality of the product can be improved.

In order to further expand the application range of the composite material tool clamping device, the first connecting column 12 is preferably a replaceable component in the application, that is, the first connecting column 12 has various models with different lengths and different shapes, wherein the models of the first connecting column 12 are selectable, the shape of the first connecting column 12 is preferably a column shape, and other shapes can be selected according to actual requirements; in order to improve the connection reliability, the first connecting column 12 is preferably made of high-strength steel; in the use process, the corresponding first connecting column 12 can be selected according to the specific structure and the size of the composite material tool 3 to be transported, so that the composite material tool clamping device has a wider application range.

Further, combined material frock clamping device that this application provided comes the connection and the loosening of control zero point binding clasp 2 and frock fixed part 1 through the air supply, and convenient operation is reliable.

The limiting ball 221 can be made of plastic, metal and the like, and in order to prolong the service life of the composite material tool clamping device, the limiting ball 221 is preferably a steel ball.

Specifically, the connecting portion 22 in the present application includes a second connecting column 222 and a jacket 223 sleeved outside the second connecting column 222, and the second connecting column 222 is slidably connected in the jacket 223 along a vertical direction; the jacket 223 is fixedly connected with the clamping bracket 21, and the gas passage 211 is communicated with the jacket 223; the outer wall of the jacket 223 is provided with air holes 2233, the air channels 211 are connected with the air holes 2233, and the height of the air holes 2233 is higher than the upper end surface of the second connecting column 222; a plurality of limiting holes 2231 are formed in the circumference of the jacket 223, and the limiting ball 221 is installed in the limiting holes 2231; the inner diameter of the limit hole 2231 is smaller than the outer diameter of the limit ball 221; the outer wall of the second connecting post 222 is provided with a plurality of limiting grooves 2221 matched with the limiting balls 221.

The jacket 223 is provided with a hollow cavity, the outer side of the jacket 223 is connected with the clamping bracket 21, and the second connecting column 222 is arranged in the cavity of the jacket 223; in order to realize the communication between the gas passage 211 and the jacket 223, the outer wall of the jacket 223 is provided with a gas hole 2233 connected with the gas passage 211, and the height of the gas hole 2233 is higher than the upper end surface of the second connecting column 222; the number and the positions of the limiting holes 2231 are matched with the limiting balls 221, that is, the number of the limiting holes 2231 is at least two, and the limiting holes 2231 are uniformly distributed on a certain circumference of the outer wall of the jacket 223, that is, the hole centers of the limiting holes 2231 are on the same horizontal plane; similarly, the number of the limiting grooves 2221 is the same as that of the limiting balls 221, and the limiting grooves 2221 are located on the same horizontal plane, and preferably, in the present application, when the fixture fixing portion 1 and the zero point clamp 2 are in a connection state, the height of the limiting grooves 2221 is higher than that of the limiting holes 2231; when the zero point clamp 2 of the tool fixing portion 1 is in a released state, i.e., not connected, the height of the limiting groove 2221 is the same as the height of the limiting hole 2231.

When the air source is started, as shown in fig. 3, compressed air enters the space above the second connecting column 222 in the jacket 223 through the air passage 211 and the air hole 2233, the pressure in the space at the upper end face of the second connecting column 222 is higher than the normal pressure, the second connecting column 222 moves downward under the action of the pressure, at this time, the position of the limiting groove 2221 moves downward to coincide with the height of the limiting hole 2231, at this time, the limiting ball 221 is located in the space formed by the limiting groove 2221 and the limiting hole 2231, the limiting ball 221 is in a contracted state, the outer diameter of the circumference of the plurality of limiting balls 221 is smaller than the inner diameter of the insertion hole 121, and in this state, the lower end of the connecting portion 22 can be inserted into the insertion hole 121 or pulled out of the insertion hole 121.

When the air source is removed, as shown in fig. 4, the pressure in the space above the second connecting post 222 is reduced, the position of the second connecting post 222 moves upward, the height of the limiting groove 2221 is higher than that of the limiting hole 2231, the limiting ball 221 is separated from the limiting groove 2221, the outer wall of the second connecting post 222 applies a force to the limiting ball 221, which points to the outer side of the jacket 223, the limiting ball 221 protrudes outward from the limiting hole 2231, and meanwhile, because the inner diameter of the limiting hole 2231 is smaller than the outer diameter of the limiting ball 221, the separating of the limiting ball 221 from the limiting hole 2231 can be avoided, so that the limiting ball 221 is in an extended state under the synergistic effect of the limiting hole 2231 and the second connecting post 222, and at this time, the limiting balls 221 are abutted against the inner wall of the insertion hole 121, thereby achieving clamping.

After the composite material tool 3 is transferred to the designated position, the air source is started, the limiting ball 221 returns to the contraction state, and the connecting part 22 can be taken out from the jack 121.

The utility model provides a combined material frock clamping device, after removing the air supply, realize being connected of zero point binding clasp 2 and frock fixed part 1, combined material frock clamping device can carry out operations such as free transportation, removal and lift to combined material frock 3 under the condition of no connecting wire this moment, reduces the constraint in the working process, improves the convenience and the security of working process, improves work efficiency, reduces energy consumption simultaneously.

In order to improve the sealing performance, it is preferable that a first sealing ring 2232 is provided between the clamping sleeve 223 and the clamping bracket 21.

Specifically, the present application preferably provides a plurality of annular grooves on the outer wall of the collet 22, and the first sealing ring 2232 is disposed in the grooves on the outer wall of the collet 22 to improve the sealing performance between the collet 223 and the clamping bracket 21.

In order to enable the second connecting column 222 to automatically return after the air supply is removed, the connecting portion 22 in the present application further comprises a spring 224, and the second connecting column 222 is connected to the jacket 223 through the spring 224.

When the air supply is turned on, the second connecting post 222 moves downward and the spring 224 is in tension; after the air source is removed, the pressure on the upper end surface of the second connecting column 222 disappears, and the second connecting column 222 moves upwards under the elastic force of the spring 224 to realize resetting.

For improving the stability of combined material frock clamping device structure, be convenient for simultaneously link to each other this combined material frock clamping device with hoisting device 5, the zero point binding clasp 2 that this application provided still includes adapter sleeve 23, and adapter sleeve 23 sets up in the outside of pressing from both sides tight support 21, and combined material frock clamping device links to each other with hoisting device 5 through this adapter sleeve 23.

The clamping bracket 21 and the adapter sleeve 23 are preferably machined from die steel.

Also, to improve the sealing performance, it is preferable that a second sealing ring 212 is provided between the clamp bracket 21 and the adapter sleeve 23.

In the present application, it is preferable that a plurality of grooves are formed on the outer side of the clamping bracket 21, and the second sealing ring 212 is fitted into the grooves on the outer side of the clamping bracket 21 to seal.

Further, the zero point clamp 2 provided by the present application further includes a pressure sensor 24, and the pressure sensor 24 is connected above the clamping bracket 21.

In order to further improve the connection strength between the connection portion 22 and the first connection post 12, referring to fig. 5, it is preferable that a limiting protrusion 122 is disposed on an inner wall of the insertion hole 121.

The limiting projection 122 is an annular convex structure extending towards the inside of the insertion hole 121; and the inner diameter of the annular limiting bump 122 is larger than the outer diameter of the circumference where the limiting ball 221 is located when in the contraction state and smaller than the outer diameter of the circumference where the limiting ball 221 is located when in the extension state, so that when the limiting ball 221 is in the extension state, the limiting ball 221 can be prevented from falling out of the jack 121 under the blocking action of the limiting block 122, and the connection reliability is improved.

The connection mode between the first connecting column 12 and the fixing plate 11 can be a detachable connection mode such as fastener connection; for the convenience of operation, referring to fig. 6, the fixing plate 11 is preferably provided with a connecting hole 111, and a limiting plate 123 is connected to the bottom end of the first connecting post 12, and the limiting plate 123 is adapted to be inserted into the connecting hole 111 to connect the first connecting post 12 and the fixing plate 11.

This application is preferred that connecting hole 111 is the U type hole, when linking to each other first connector strut 12 with fixed plate 11, inserts limiting plate 123 in connecting hole 111 from the open position of connecting hole 111, rotates 90 with first connector strut 12 again, makes limiting plate 123 block in the connecting hole 111 can.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims (10)

1. The composite material tool clamping device is characterized by comprising a tool fixing part (1) and a zero point clamp (2); wherein the content of the first and second substances,

the fixture fixing part (1) comprises a fixing plate (11) and a first connecting column (12) connected with the fixing plate (11);

the top end of the first connecting column (12) is provided with an insertion hole (121);

the zero point clamping device (2) comprises a clamping bracket (21) and a connecting part (22) connected to the bottom of the clamping bracket (21); the bottom end of the connecting part (22) is provided with a plurality of telescopic limiting balls (221);

the limiting balls (221) are suitable for being inserted into the insertion holes (121) so as to realize the connection between the tool fixing part (1) and the zero point clamp (2);

a gas channel (211) communicated with the connecting part (22) is arranged in the clamping support (21), and the gas channel (211) is connected with a gas source;

through the opening and closing of the air source, the telescopic state of the plurality of limiting balls (221) is controlled, and then the connection and the release of the tool fixing part (1) and the zero point clamp (2) are controlled.

2. The composite material tooling clamping device of claim 1 wherein the limiting ball (221) is a steel ball.

3. The composite material tooling clamping device according to claim 1, wherein the connecting part (22) comprises a second connecting column (222) and a jacket (223) sleeved outside the second connecting column (222), and the second connecting column (222) is connected in a sliding manner in the jacket (223) along a vertical direction; the jacket (223) is fixedly connected with the clamping bracket (21), and the gas channel (211) is communicated with the jacket (223); the outer wall of the jacket (223) is provided with air holes (2233), the gas channel (211) is connected with the air holes (2233), and the height of the air holes (2233) is higher than the upper end face of the second connecting column (222); a plurality of limiting holes (2231) are formed in the circumference of the jacket (223), and the limiting ball (221) is mounted in the limiting holes (2231); the inner diameter of the limiting hole (2231) is smaller than the outer diameter of the limiting ball (221); the outer wall of the second connecting column (222) is provided with a plurality of limiting grooves (2221) matched with the limiting balls (221).

4. The composite material tooling clamping device according to claim 3, wherein a first sealing ring (2232) is arranged between the jacket (223) and the clamping bracket (21).

5. The composite tooling clamping device of claim 3 wherein the connecting portion (22) further comprises a spring (224), the second connecting post (222) being connected to the collet (223) by the spring (224).

6. The composite material tooling clamping device according to any one of claims 1 to 5, wherein the zero point clamp (2) further comprises a adapter sleeve (23), and the adapter sleeve (23) is arranged on the outer side of the clamping bracket (21).

7. The composite material tooling clamping device according to claim 6, wherein a second sealing ring (212) is arranged between the clamping bracket (21) and the adapter sleeve (23).

8. The composite material tooling clamping device according to claim 6, wherein the zero point clamp (2) further comprises a pressure sensor (24), and the pressure sensor (24) is connected above the clamping bracket (21).

9. The composite material tooling clamping device according to claim 6, wherein the inner wall of the insertion hole (121) is provided with a limit bump (122).

10. The composite material tooling clamping device according to claim 9, wherein the fixing plate (11) is provided with a connecting hole (111), a limiting plate (123) is connected to the bottom end of the first connecting column (12), and the limiting plate (123) is suitable for being inserted into the connecting hole (111) to connect the first connecting column (12) and the fixing plate (11).

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