CN219761687U - Circuit board assembly - Google Patents

Abstract

The utility model discloses a circuit board assembly, which comprises a supporting mechanism, an adjusting mechanism and a clamping mechanism, wherein the adjusting mechanism is arranged on the supporting mechanism, the clamping mechanism is arranged on the adjusting mechanism, the supporting mechanism comprises a fixed plate and a mounting frame, the mounting frame is arranged at the top of the fixed plate, fixed rods are fixedly connected between the mounting frame and the fixed plate, the number of the fixed rods is greater than three, the adjusting mechanism consists of an adjusting component and a fixing component, the adjusting component is arranged on the mounting frame, the fixing component is arranged in the adjusting component, and the adjusting component comprises a first sliding block and a second sliding block. According to the utility model, the adjusting mechanism is arranged, and the distance between the two first mounting plates and the two second mounting plates is adjusted, so that circuit board assemblies with different sizes can be fixed, the application range of the device is improved, and meanwhile, the device is simple to operate and convenient to use.

Description

Circuit board assembly

Technical Field

The utility model relates to the field of circuit boards, in particular to a circuit board assembly.

Background

The names of the circuit boards are: circuit boards, PCB boards, aluminum substrates, high frequency boards, thick copper plates, impedance boards, PCBs, ultra-thin circuit boards, printed circuit boards, etc., which make circuits miniaturized and visualized, play an important role in mass production of fixed circuits and optimizing the layout of electrical appliances, and as the electronic industry rapidly progresses, the circuit boards as basic members of electronic products are increasingly used.

The following problems exist with the current circuit board assemblies on the market:

1. when the circuit board assemblies with different sizes are installed, the circuit board assemblies are required to be fixed by the installation racks matched with the circuit board assemblies in size, and meanwhile, the installation of the circuit board assemblies is mainly carried out by adopting screws, so that tools such as screwdrivers and the like are required to be used when the circuit board assemblies are required to be disassembled or installed, and the circuit board assemblies cannot be disassembled conveniently;

2. according to the service environment, the circuit board assembly can generate some vibration in the installation and use process, and the welding spots on the surface of the circuit board assembly can be separated after a long time, so that the circuit board assembly is damaged.

Therefore, it is necessary to invent a circuit board assembly to solve the above problems.

Disclosure of Invention

The utility model aims to provide a circuit board assembly, which can fix circuit board assemblies with different sizes by arranging an adjusting mechanism and adjusting the distance between two first mounting plates and two second mounting plates, thereby being beneficial to improving the application range of the device, and meanwhile, the device is simple to operate and convenient to use so as to solve the defects in the technology.

In order to achieve the above object, the present utility model provides the following technical solutions: the circuit board assembly comprises a supporting mechanism, an adjusting mechanism and a clamping mechanism, wherein the adjusting mechanism is arranged on the supporting mechanism, and the clamping mechanism is arranged on the adjusting mechanism;

the supporting mechanism comprises a fixed plate and a mounting frame, the mounting frame is arranged at the top of the fixed plate, fixed rods are fixedly connected between the mounting frame and the fixed plate, and the number of the fixed rods is greater than three;

the adjusting mechanism consists of an adjusting component and a fixing component, wherein the adjusting component is arranged on the mounting frame, and the fixing component is arranged inside the adjusting component.

Preferably, the adjusting component comprises a first sliding block and a second sliding block, the mounting frame penetrates through the first sliding block, the first sliding block is in sliding connection with the mounting frame, the first sliding blocks are arranged in two groups, the two groups of the first sliding blocks are symmetrically distributed about the central line of the mounting frame, the number of each group of the first sliding blocks is two, a first mounting plate is fixedly connected between the two first sliding blocks, the mounting frame penetrates through the second sliding block, the second sliding block is in sliding connection with the mounting frame, the second sliding block is arranged in two groups, the two groups of the second sliding blocks are symmetrically distributed about the central line of the mounting frame, the number of each group of the second sliding blocks is two, and a second mounting plate is fixedly connected between the two second sliding blocks;

the first mounting plates between the two first sliding blocks can be driven to slide on the inner side of the mounting frame by simultaneously sliding the two first sliding blocks on the surface of the mounting frame, and the distance between the two first mounting plates can be adjusted by sliding the two first mounting plates

The two second sliding blocks slide on the surface of the mounting frame simultaneously, so that the second mounting plates between the two second sliding blocks can be driven to slide on the inner side of the mounting frame, and the distance between the two second mounting plates can be adjusted by sliding the two second mounting plates.

Preferably, the fixing component comprises a first chute, a second chute, a first limit groove and a second limit groove, the first chute is arranged inside the first slide block, a first magnet is arranged at the bottom of the first chute, a first clamping rod is slidably arranged inside the first chute, the first clamping rod is L-shaped and made of magnetic materials, the first clamping rod and the first magnet repel each other, the top of the first clamping rod penetrates through the first slide block, and a first abutting block is fixedly connected to the top of the first clamping rod;

the first limiting grooves are formed in the surface of the mounting frame, one side of each first limiting groove is provided with a plurality of first clamping grooves, the first clamping grooves correspond to the first clamping rods, the number of the first limiting grooves is two, and the two first limiting grooves are symmetrically distributed about the central line of the mounting frame;

the second sliding groove is formed in the second sliding block, a second magnet is arranged at the bottom of the second sliding groove, a second clamping rod is slidably arranged in the second sliding groove, the second clamping rod is L-shaped and made of magnetic materials, the second clamping rod and the second magnet repel each other, the top of the second clamping rod penetrates through the second sliding block, and a second supporting block is fixedly connected to the top of the second clamping rod;

the second limiting grooves are formed in the surface of the mounting frame, and second clamping grooves (a plurality of second clamping grooves (corresponding to the second clamping rods, two second limiting grooves are formed in number;

the first propping block is pressed to drive the first clamping rod to slide downwards in the first sliding groove, at the moment, the first clamping rod is separated from the first clamping groove, at the moment, the first sliding block can slide on the surface of the mounting frame, when the first propping block is loosened, the first clamping rod is repelled by the first magnet, the first clamping rod can slide upwards in the first sliding groove, at the moment, the first clamping rod is automatically separated from the first clamping groove, and therefore the first sliding block is automatically locked;

the second blocking rod can be driven to slide downwards in the second sliding groove by pressing the second supporting block, at the moment, the second blocking rod can slide with the second blocking groove (the second sliding block can slide on the surface of the mounting frame at the moment, when the second supporting block is loosened, the second blocking rod can slide upwards in the second sliding groove by repelling the second blocking rod through the second magnet, at the moment, the second blocking rod is automatically separated from the second blocking groove, and therefore the second sliding block is automatically locked.

4. Preferably, the clamping mechanism comprises a first mounting groove, a second mounting groove, a first clamping plate and a second clamping plate, wherein the first mounting groove is formed in the surface of the first mounting plate, the first clamping plate is arranged inside the first mounting plate, the first clamping plate is L-shaped, a first sliding rod is fixedly connected to the side wall of the first clamping plate, one end of the first sliding rod penetrates through the first mounting groove, a first reset spring is sleeved outside the first sliding rod, one end of the first reset spring abuts against the first clamping plate, and the other end of the first reset spring abuts against the first mounting groove;

the second mounting groove is formed in the surface of the second mounting plate, the second clamping plate is arranged in the second mounting plate, the second clamping plate is L-shaped, the side wall of the second clamping plate is fixedly connected with a second sliding rod, one end of the second sliding rod penetrates through the second mounting groove, a second reset spring is sleeved outside the second sliding rod, one end of the second reset spring abuts against the second clamping plate, and the other end of the second reset spring abuts against the second mounting groove;

the side edge of the circuit board can be fixed through the hole between the first clamping plate and the first mounting plate, and meanwhile, when the first clamping plate is impacted, the first clamping plate can move and press the first reset spring, so that the impact can be buffered through the first reset spring, and the circuit board can be prevented from being damaged;

the side of circuit board can be fixed through the hole between second grip block and the second mounting panel, and simultaneously when the second grip block received the impact, the second grip block can remove and extrude through second reset spring to can cushion the impact that receives through second reset spring, and then can avoid the circuit board to damage.

Preferably, a cooling fan is arranged between the fixed plate and the mounting frame;

the heat dissipation efficiency of the circuit board can be improved by arranging the heat dissipation fan, and further the circuit board can be prevented from being damaged due to high temperature during working.

Preferably, buffer strips are arranged on the inner sides of the first clamping plate and the second clamping plate, and the buffer strips are made of rubber materials; can avoid circuit board and first grip block and second grip block hard contact through setting up the buffer strip to can slow down the wearing and tearing between first grip block and second grip block and the circuit board.

In the technical scheme, the utility model has the technical effects and advantages that:

1. through setting up adjustment mechanism, through adjusting the distance between two first mounting panels and two second mounting panels, can fix the circuit board assembly of different sizes, and then be favorable to improving the application scope of device, device easy operation facilitates the use simultaneously;

2. through setting up fixture, when first grip block received the impact, first grip block can remove and extrude first reset spring to can cushion the impact that receives through first reset spring, when the second grip block received the impact, the second grip block can remove and extrude through second reset spring, thus can cushion the impact that receives through second reset spring, above-mentioned structure can be when the circuit board received the impact to the circuit board buffer protection, and then can avoid the circuit board to damage.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of a supporting mechanism according to the present utility model;

FIG. 3 is a schematic view of a first mounting plate structure according to the present utility model;

FIG. 4 is a schematic view of a second mounting plate structure according to the present utility model;

FIG. 5 is an enlarged view of the portion A mechanism of FIG. 3 in accordance with the present utility model;

FIG. 6 is an enlarged view of the structure of portion B of FIG. 3 in accordance with the present utility model;

FIG. 7 is an enlarged view of the structure of portion C of FIG. 4 in accordance with the present utility model;

fig. 8 is an enlarged view of the D portion structure of fig. 5 according to the present utility model.

Reference numerals illustrate:

1. a support mechanism; 11. a fixing plate; 12. a mounting frame; 13. a fixed rod;

2. an adjusting mechanism;

21. an adjustment assembly; 211. a first slider; 212. a second slider; 213. a first mounting plate; 214. a second mounting plate;

22. a fixing assembly; 221. a first chute; 222. a second chute; 223. a first limit groove; 224. the second limit groove; 225. a first magnet; 226. a first clamping rod; 227. a first abutment; 228. a first clamping groove; 229. a second magnet; 2210. a second clamping rod; 2211. a second abutting block; 2212. a second clamping groove;

3. a clamping mechanism;

31. a first mounting groove; 32. a second mounting groove; 33. a first clamping plate; 34. a second clamping plate; 35. a first slide bar; 36. a first return spring; 37. a second slide bar; 38. a second return spring;

4. a heat radiation fan;

5. and (5) buffering the strip.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a circuit board assembly as shown in figures 1-8, which comprises a supporting mechanism 1, an adjusting mechanism 2 and a clamping mechanism 3, wherein the adjusting mechanism 2 is arranged on the supporting mechanism 1, and the clamping mechanism 3 is arranged on the adjusting mechanism 2;

the supporting mechanism 1 comprises a fixed plate 11 and a mounting frame 12, wherein the mounting frame 12 is arranged at the top of the fixed plate 11, fixed rods 13 are fixedly connected between the mounting frame 12 and the fixed plate 11, and the number of the fixed rods 13 is greater than three;

the adjusting mechanism 2 is composed of an adjusting component 21 and a fixing component 22, wherein the adjusting component 21 is arranged on the mounting frame 12, and the fixing component 22 is arranged inside the adjusting component 21.

Further, in the above technical solution, the adjusting assembly 21 includes a first slider 211 and a second slider 212, the mounting frame 12 is disposed through the first slider 211, the first slider 211 is slidably connected with the mounting frame 12, the first sliders 211 are provided in two groups, the two groups of the first sliders 211 are symmetrically distributed about a centerline of the mounting frame 12, the number of the first sliders 211 in each group is two, a first mounting plate 213 is fixedly connected between the two first sliders 211, the mounting frame 12 is disposed through the second slider 212, the second slider 212 is slidably connected with the mounting frame 12, the second sliders 212 in two groups are symmetrically distributed about the centerline of the mounting frame 12, the number of the second sliders 212 in each group is two, and a second mounting plate 214 is fixedly connected between the two second sliders 212.

Further, in the above technical solution, the fixing assembly 22 includes a first sliding groove 221, a second sliding groove 222, a first limiting groove 223, and a second limiting groove 224, where the first sliding groove 221 is disposed inside the first sliding block 211, a first magnet 225 is disposed at the bottom of the first sliding groove 221, a first clamping rod 226 is slidably disposed inside the first sliding groove 221, the first clamping rod 226 is L-shaped, the first clamping rod 226 is made of a magnetic material, the first clamping rod 226 repels the first magnet 225, the top of the first clamping rod 226 is disposed through the first sliding block 211, and a first abutment block 227 is fixedly connected to the top of the first clamping rod 226;

the first limiting grooves 223 are formed in the surface of the mounting frame 12, one side of the first limiting grooves 223 is provided with first clamping grooves 228, the number of the first clamping grooves 228 is plural, the first clamping grooves 228 correspond to the first clamping rods 226, the number of the first limiting grooves 223 is two, and the two first limiting grooves 223 are symmetrically distributed about the center line of the mounting frame 12;

the second sliding groove 222 is disposed inside the second sliding block 212, a second magnet 229 is disposed at the bottom of the second sliding groove 222, a second clamping rod 2210 is slidably disposed inside the second sliding groove 222, the second clamping rod 2210 is L-shaped, the second clamping rod 2210 is made of a magnetic material, the second clamping rod 2210 repels the second magnet 229, the top of the second clamping rod 2210 penetrates through the second sliding block 212, and a second abutting block 2211 is fixedly connected to the top of the second clamping rod 2210;

the second limiting grooves 224 are formed in the surface of the mounting frame 12, second clamping grooves (2212) are formed in one side of the second limiting grooves 224, the number of the second clamping grooves (2212) is multiple, the second clamping grooves (2212 correspond to the second clamping rods 2210), the number of the second limiting grooves 224 is two, and the two second limiting grooves 224 are symmetrically distributed about the central line of the mounting frame 12.

Further, in the above technical solution, the clamping mechanism 3 includes a first mounting groove 31, a second mounting groove 32, a first clamping plate 33 and a second clamping plate 34, where the first mounting groove 31 is disposed on a surface of the first mounting plate 213, the first clamping plate 33 is disposed inside the first mounting plate 213, the first clamping plate 33 is L-shaped, a first sliding rod 35 is fixedly connected to a side wall of the first clamping plate 33, one end of the first sliding rod 35 penetrates through the first mounting groove 31, a first return spring 36 is sleeved outside the first sliding rod 35, one end of the first return spring 36 abuts against the first clamping plate 33, and the other end of the first return spring 36 abuts against the first mounting groove 31;

the second mounting groove 32 is formed in the surface of the second mounting plate 214, the second clamping plate 34 is arranged inside the second mounting plate 214, the second clamping plate 34 is L-shaped, a second sliding rod 37 is fixedly connected to the side wall of the second clamping plate 34, one end of the second sliding rod 37 penetrates through the second mounting groove 32, a second return spring 38 is sleeved outside the second sliding rod 37, one end of the second return spring 38 abuts against the second clamping plate 34, and the other end of the second return spring 38 abuts against the second mounting groove 32.

Further, in the above technical solution, the heat dissipation fan 4 is disposed between the fixing plate 11 and the mounting frame 12.

Further, in the above technical solution, the inner sides of the first clamping plate 33 and the second clamping plate 34 are respectively provided with a buffer strip 5, and the buffer strips 5 are made of rubber materials.

The working principle of the utility model is as follows:

referring to fig. 1-8 of the specification, when the device is used, firstly, a circuit board assembly to be mounted is placed on the inner side of a mounting frame 12, then a first supporting block 227 is pressed to drive a first clamping rod 226 to slide downwards in a first sliding groove 221, at the moment, the first clamping rod 226 is disengaged from a first clamping groove 228, at the moment, a first sliding block 211 can slide on the surface of the mounting frame 12, by simultaneously sliding two second sliding blocks 212 on the surface of the mounting frame 12, a second mounting plate 214 between the two second sliding blocks 212 can be driven to slide on the inner side of the mounting frame 12, by sliding the two second mounting plates 214, the distance between the two second mounting plates 214 can be adjusted, and the gap between each first mounting plate 213 and a first clamping plate 33 can fix the side edge of the circuit board, so that the front side and the rear side of the circuit board can be fixed through the two first mounting plates 213;

when the first abutment 227 is released, the first magnet 225 repels the first clamping rod 226, so that the first clamping rod 226 can slide upwards in the first sliding groove 221, and at this time, the first clamping rod 226 is automatically disengaged from the first clamping groove 228, so that the first sliding block 211 is automatically locked;

then, the second pressing block 2211 can drive the second clamping rod 2210 to slide downwards in the second sliding groove 222, at this time, the second clamping rod 2210 is disengaged from the second clamping groove (2212, at this time, the second sliding blocks 212 can slide on the surface of the mounting frame 12, by simultaneously sliding the two second sliding blocks 212 on the surface of the mounting frame 12, the second mounting plates 214 between the two second sliding blocks 212 can be driven to slide on the inner side of the mounting frame 12, by sliding the two second mounting plates 214, the distance between the two second mounting plates 214 can be adjusted, and the gap between each second mounting plate 214 and the second clamping plate 34 can be used for fixing the side edge of the circuit board, so that the front side and the rear side of the circuit board can be fixed through the two second mounting plates 214;

when the second abutment 2211 is released, the second magnet 229 repels the second clamping rod 2210, so that the second clamping rod 2210 can slide upwards in the second sliding groove 222, and at this time, the second clamping rod 2210 is automatically disengaged from the second clamping groove 2212, so that the second slider 212 is automatically locked;

therefore, the circuit boards with different sizes can be fixed through the structure;

referring to fig. 1 to 8 of the specification, when the device is in use, the side edge of the circuit board can be fixed through the hole between the first clamping plate 33 and the first mounting plate 213, and meanwhile, when the first clamping plate 33 is impacted, the first clamping plate 33 can move and press the first return spring 36, so that the impact can be buffered through the first return spring 36, and further, the circuit board can be prevented from being damaged;

the side of the circuit board can be fixed through the hole between the second clamping plate 34 and the second mounting plate 214, and meanwhile when the second clamping plate 34 is impacted, the second clamping plate 34 can move and squeeze to pass through the second return spring 38, so that the impact can be buffered through the second return spring 38, and the circuit board can be prevented from being damaged.

Standard parts used in the utility model can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of all parts adopt conventional means such as mature bolts, rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the details are not described.

Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.

Claims (6)

1. The utility model provides a circuit board assembly which characterized in that: the device comprises a supporting mechanism (1), an adjusting mechanism (2) and a clamping mechanism (3), wherein the adjusting mechanism (2) is arranged on the supporting mechanism (1), and the clamping mechanism (3) is arranged on the adjusting mechanism (2);

the supporting mechanism (1) comprises a fixed plate (11) and a mounting frame (12), wherein the mounting frame (12) is arranged at the top of the fixed plate (11), fixed rods (13) are fixedly connected between the mounting frame (12) and the fixed plate (11), and the number of the fixed rods (13) is more than three;

the adjusting mechanism (2) consists of an adjusting component (21) and a fixing component (22), wherein the adjusting component (21) is arranged on the mounting frame (12), and the fixing component (22) is arranged inside the adjusting component (21).

2. A circuit board assembly according to claim 1, wherein: the adjusting component (21) comprises first sliding blocks (211) and second sliding blocks (212), the mounting frame (12) penetrates through the first sliding blocks (211), the first sliding blocks (211) are in sliding connection with the mounting frame (12), the first sliding blocks (211) are arranged in two groups, the first sliding blocks (211) are symmetrically distributed about the center line of the mounting frame (12), each group is arranged in two groups, a first mounting plate (213) is fixedly connected between the two first sliding blocks (211), the mounting frame (12) penetrates through the second sliding blocks (212) to be arranged, the second sliding blocks (212) are in sliding connection with the mounting frame (12), the second sliding blocks (212) are arranged in two groups, the second sliding blocks (212) are symmetrically distributed about the center line of the mounting frame (12), the second sliding blocks (212) are arranged in two groups, and a second mounting plate (214) is fixedly connected between the two second sliding blocks (212).

3. A circuit board assembly according to claim 2, wherein: the fixing assembly (22) comprises a first sliding groove (221), a second sliding groove (222), a first limiting groove (223) and a second limiting groove (224), wherein the first sliding groove (221) is formed in the first sliding block (211), a first magnet (225) is arranged at the bottom of the first sliding groove (221), a first clamping rod (226) is slidably arranged in the first sliding groove (221), the first clamping rod (226) is L-shaped, the first clamping rod (226) is made of a magnetic material, the first clamping rod (226) repels the first magnet (225), the top of the first clamping rod (226) penetrates through the first sliding block (211), and a first supporting block (227) is fixedly connected to the top of the first clamping rod (226);

the first limiting grooves (223) are formed in the surface of the mounting frame (12), one side of each first limiting groove (223) is provided with a plurality of first clamping grooves (228), the number of the first clamping grooves (228) is set to be equal to that of the first clamping rods (226), the number of the first limiting grooves (223) is set to be two, and the two first limiting grooves (223) are symmetrically distributed about the central line of the mounting frame (12);

the second sliding groove (222) is formed in the second sliding block (212), a second magnet (229) is arranged at the bottom of the second sliding groove (222), a second clamping rod (2210) is slidably arranged in the second sliding groove (222), the second clamping rod (2210) is L-shaped, the second clamping rod (2210) is made of magnetic materials, the second clamping rod (2210) and the second magnet (229) repel each other, the top of the second clamping rod (2210) penetrates through the second sliding block (212), and a second supporting block (2211) is fixedly connected to the top of the second clamping rod (2210);

the second limiting grooves (224) are formed in the surface of the mounting frame (12), second clamping grooves ((2212) are formed in one side of the second limiting grooves (224), the number of the second clamping grooves ((2212) is multiple, the second clamping grooves ((2212) are corresponding to the second clamping rods (2210)), the number of the second limiting grooves (224) is two, and the two second limiting grooves (224) are symmetrically distributed about the central line of the mounting frame (12).

4. A circuit board assembly according to claim 1, wherein: the clamping mechanism (3) comprises a first mounting groove (31), a second mounting groove (32), a first clamping plate (33) and a second clamping plate (34), wherein the first mounting groove (31) is formed in the surface of a first mounting plate (213), the first clamping plate (33) is arranged inside the first mounting plate (213), the first clamping plate (33) is L-shaped, a first sliding rod (35) is fixedly connected to the side wall of the first clamping plate (33), one end of the first sliding rod (35) penetrates through the first mounting groove (31), a first reset spring (36) is sleeved outside the first sliding rod (35), one end of the first reset spring (36) is abutted against the first clamping plate (33), and the other end of the first reset spring (36) is abutted against the first mounting groove (31);

the second mounting groove (32) is formed in the surface of the second mounting plate (214), the second clamping plate (34) is arranged inside the second mounting plate (214), the second clamping plate (34) is in an L shape, a second sliding rod (37) is fixedly connected to the side wall of the second clamping plate (34), one end of the second sliding rod (37) penetrates through the second mounting groove (32), a second return spring (38) is sleeved outside the second sliding rod (37), one end of the second return spring (38) abuts against the second clamping plate (34), and the other end of the second return spring (38) abuts against the second mounting groove (32).

5. A circuit board assembly according to claim 1, wherein: a cooling fan (4) is arranged between the fixing plate (11) and the mounting frame (12).

6. The circuit board assembly of claim 4, wherein: the inner sides of the first clamping plate (33) and the second clamping plate (34) are respectively provided with a buffer strip (5), and the buffer strips (5) are made of rubber materials.