High-temperature, high-weight and large-area wave-soldering clamp

Abstract

The utility model discloses a high-temperature, high-weight and large-area wave soldering clamp which comprises two supporting rods which are arranged in parallel, a cross rod is fixedly installed at the upper ends of the two supporting rods, sliding blocks are fixedly installed at the lower ends of the two supporting rods respectively, a buffer rod is arranged in the center of the lower end of the cross rod, and supporting pieces are installed at the upper ends of the inner sides of the two supporting rods respectively. The system further comprises; according to the buffering assembly, through cooperation of two sliding blocks and an external rail and the buffering and damping design of a rubber pad in a sliding groove, the clamp can be precisely and stably located in a sliding mode in wave soldering equipment, the welding position precision of an electronic element under the high-temperature and high-weight condition is guaranteed, and the production efficiency and the consistency of product quality are improved; the heat dissipation grooves in the upper ends of the transverse rods increase the contact area with air, heat absorbed by the clamp can be rapidly and effectively dissipated during high-temperature welding, the clamp is prevented from being deformed and damaged due to overheating, and the service life of the clamp is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wave soldering, and particularly relates to a high-temperature and high-weight large-area wave soldering clamp. BACKGROUND

[0002] In the modern electronic manufacturing industry, wave soldering, as an efficient welding technology, is widely used in the connection between electronic components and circuit boards, especially when dealing with high-temperature, high-weight and large-area welding tasks, the stability and reliability of wave soldering technology are particularly important, however, such welding operation has extremely harsh requirements for the clamp, the clamp not only needs to have sufficient strength and stability to withstand the huge thermal stress and mechanical stress generated during the welding process, but also needs to have good shock resistance and buffering performance to protect the precision electronic components from the influence of vibration and impact force generated during the welding process.

[0003] Traditional clamp design often cannot fully meet these stringent requirements, in a high-temperature and high-weight environment, ordinary clamps are prone to deformation due to thermal expansion and material fatigue, resulting in a decrease in welding precision, and even damage to electronic components, in addition, the vibration generated during the wave soldering process often has an adverse effect on the positioning accuracy of electronic components and the welding quality, especially when welding a large area, the influence of vibration is more significant.

[0004] Therefore, the existing structure and defects are improved, and the high-temperature and high-weight large-area wave soldering clamp is provided, so as to achieve a more practical purpose. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model provides a high-temperature and high-weight large-area wave soldering clamp, which solves the above problems.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a high-temperature and high-weight large-area wave soldering clamp, comprising a support rod, the support rod is arranged in parallel in two, a cross bar is fixedly installed at the upper end of the two support rods, a sliding block is fixedly installed at the lower end of the two support rods respectively, a buffer rod is arranged at the lower end of the cross bar, a support piece is installed at the upper end of the inner side of the two support rods respectively, characterized in that, further comprising;

[0007] The buffer assembly is fixedly installed at the lower end of the cross bar, and is used for reducing the external influence on the electronic components during transportation or operation.

[0008] Preferably, the cross bar, the two support rods and the buffer rod are respectively made of high-temperature alloy steel.

[0009] Preferably, the lower end of the two sliding blocks is centrally provided with a sliding groove, a rubber pad is arranged at one end of the inner wall of the sliding groove, a bolt one is connected to the outer end of the rubber pad, and the other end of the bolt one extends to the outer end of the sliding block through the inner wall of the sliding block.

[0010] Preferably, the outer end of the cross bar is provided with a mounting groove on both sides, a threaded hole is formed in the inner side surface of the lower end of the two mounting grooves, a plurality of heat dissipation grooves are formed in the upper end surface of the cross bar, and two hinge seats are fixedly installed on the central lower end surface of the cross bar.

[0011] Preferably, the upper end of the two support rods is fixedly connected with a mounting block, the outer end of the two mounting blocks is inserted into the mounting groove formed at the two ends of the cross bar, and a threaded hole is formed in the upper end of the opposite inner side surfaces of the two support rods.

[0012] Preferably, the support member is triangular, and a bolt two is arranged on the upper and lower end surfaces of the support member, and the front ends of the two bolts two are threadedly connected in the threaded holes formed in the cross bar and the support rods.

[0013] Preferably, the lower end of the buffer rod is provided with a buffer spring one, a support base is fixedly connected to the upper end surface of the buffer rod, a buffer box is fixedly installed on the central upper end surface of the support base, a through hole is formed in the two side surfaces of the buffer box, a guide rod one is sleeved in the through hole, and an anti-vibration spring is fixedly connected to the inner opposite surfaces of the two guide rods one in the buffer box.

[0014] Preferably, the buffer assembly comprises an inclined telescopic sleeve, a connecting rod, a guide rod two and a buffer spring two, the two inclined telescopic sleeves are arranged at the upper ends of the buffer box, the connecting rod is fixedly installed at the lower end of each inclined telescopic sleeve, the lower end of the connecting rod is movably connected to the front end of the guide rod one, a through hole is formed in the central upper end of each inclined telescopic sleeve, the guide rod two is sleeved in the through hole, the two ends of the guide rod two are movably connected to the lower end of the hinge seat, the rear end of the guide rod two is fixedly connected with the buffer spring two in the inclined telescopic sleeve, and the other end of the buffer spring two is fixedly connected to the inner bottom surface of the inclined telescopic sleeve.

[0015] Compared with the prior art, the high-temperature and high-weight large-area wave peak welding clamp has the following beneficial effects:

[0016] In the high-temperature and high-weight wave soldering operation environment, the fixture provides a solid and stable support platform for electronic components by virtue of the stable main support structure of the cross rod and the two support rods and the strengthening effect of the support on the connection strength of the cross rod and the support rod, effectively avoids the problems of structural deformation caused by high temperature and loosening under high weight pressure, and simultaneously, the comprehensive buffering system composed of the buffer spring one in the buffer rod, the shockproof spring in the buffer box and the oblique telescopic sleeve, the buffer spring two and the like in the buffer assembly can efficiently absorb and disperse impact force and vibration from all directions, greatly reduces the risk of displacement and damage of electronic components during welding, guarantees the precision of welding and the yield of products, and reduces the production cost.

[0017] The cooperation of the two sliding blocks with the external track and the buffering and damping design of the rubber pad in the sliding groove enable the fixture to slide and position accurately and stably in the wave soldering equipment, ensure the welding position precision of electronic components under high-temperature and high-weight conditions, improve the production efficiency and the consistency of product quality, in addition, the heat dissipation groove at the upper end of the cross rod increases the contact area with air, can quickly and effectively dissipate the heat absorbed by the fixture during high-temperature welding, prevents the deformation and damage of the fixture due to overheating, prolongs the service life of the fixture, simultaneously creates a relatively stable temperature environment for electronic components, reduces the potential influence of high temperature on the performance of electronic components, further improves the overall quality and reliability of wave soldering, and enhances the competitiveness of products in the market. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic view of the utility model;

[0019] Figure 2 It is a support rod structure schematic view of the utility model;

[0020] Figure 3 It is a buffer rod structure schematic view of the utility model;

[0021] Figure 4 It is a buffer assembly structure schematic view of the utility model.

[0022] In the drawing: 1, cross rod; 2, support rod; 3, sliding block; 4, buffer rod; 5, support; 6, rubber pad; 7, bolt one; 8, mounting block; 9, bolt two; 10, support chassis; 11, buffer spring one; 12, oblique telescopic sleeve; 13, hinged seat; 14, buffer box; 15, shockproof spring; 16, guide rod one; 17, connecting rod; 18, guide rod two; 19, buffer spring two. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present utility model.

[0024] Please refer to Figures 1-4 , high-temperature and high-weight large-area wave-soldering fixture, including support rod 2, support rod 2 parallel arrangement is two, in two support rod 2 upper end fixed installation has crossbeam 1, in two support rod 2 lower end respectively fixed installation has sliding block 3, in crossbeam 1 lower end central arrangement has buffer rod 4, in two support rod 2 inner side upper end respectively installation has support piece 5, its characterized in that, still include;

[0025] Buffering assembly, fixedly installed at the lower end of the crossbeam 1, and used for reducing the external influence on electronic components during handling or operation.

[0026] Further, the crossbeam 1, the two support rods 2 and the buffer rod 4 are respectively made of high-temperature alloy steel.

[0027] Further, the lower end of the two sliding blocks 3 is respectively provided with a sliding groove, the inner wall of the sliding groove is respectively provided with a rubber pad 6, the outer end of the rubber pad 6 is respectively connected with a bolt 7, and the other end of the bolt 7 is extended to the outer end of the sliding block 3 through the inner wall of the sliding block 3.

[0028] Further, the outer end of the crossbeam 1 is respectively provided with a mounting groove, the lower end of the two mounting grooves is respectively provided with a threaded hole, and the upper end surface of the crossbeam 1 is respectively provided with a plurality of heat dissipation grooves.

[0029] Further, the upper end of the two support rods 2 is respectively fixedly connected with a mounting block 8, the outer end of the two mounting blocks 8 is respectively inserted into the mounting groove at the two ends of the crossbeam 1, and the upper end of the opposite surface of the two support rods 2 is respectively provided with a threaded hole.

[0030] Further, the support piece 5 is triangular, the upper and lower end surfaces of the support piece 5 are respectively provided with a bolt 9, and the front end of the two bolts 9 is respectively connected with the threaded hole of the crossbeam 1 and the support rod 2 through the internal thread of the support piece 5.

[0031] Further, the buffer spring one 11 is arranged at the lower end of the buffer rod 4, the support base 10 is fixedly connected to the upper end surface of the buffer rod 4, the buffer box 14 is fixedly installed at the central upper end surface of the support base 10, the through holes are respectively arranged at the two side surfaces of the buffer box 14, the guide rod one 16 is respectively sleeved in the through holes, and the anti-vibration spring 15 is fixedly connected to the opposite surfaces of the two guide rod one 16 inside the buffer box 14.

[0032] Further, the buffer assembly comprises the oblique telescopic sleeves 12, the connecting rods 17, the guide rod two 18 and the buffer spring two 19, the two oblique telescopic sleeves 12 are arranged at the upper ends of the two sides of the buffer box 14, the connecting rods 17 are respectively fixedly installed at the lower ends of the two oblique telescopic sleeves 12, the lower ends of the connecting rods 17 are movably connected to the front ends of the two guide rod one 16, the through holes are respectively arranged at the central upper ends of the two oblique telescopic sleeves 12, the guide rod two 18 is respectively sleeved in the through holes, the lower ends of the guide rod two 18 are movably connected to the lower end inside of the hinge seat 13, the buffer spring two 19 is fixedly connected to the rear end of the guide rod two 18 inside the oblique telescopic sleeve 12, and the other end of the buffer spring two 19 is fixedly connected to the inner bottom surface of the oblique telescopic sleeve 12.

[0033] The horizontal rod 1 is made of high-temperature alloy steel and has excellent strength and heat resistance. The mounting grooves at the two sides of the outer end of the horizontal rod 1 are used to accurately connect the mounting blocks 8 of the support rods 2, so as to ensure that the overall structure is stable and reliable. The heat dissipation grooves at the upper end of the horizontal rod 1 can accelerate heat dissipation during high-temperature welding, prevent the clamp from being deformed due to overheating, ensure the service life of the clamp and protect the electronic components. The hinge seat 13 at the lower end provides a key support for the buffer assembly and a flexible connection point.

[0034] The support rod 2 is made of high-temperature alloy steel and is arranged in parallel with the other support rod 2. The mounting block 8 at the upper end of the support rod 2 is stably connected to the horizontal rod 1 by a bolt, and the screw holes inside the support rod 2 are used to install the support 5, thereby further strengthening the stability of the structure. The lower end of the support rod 2 is provided with the sliding block 3, which helps the clamp to smoothly slide in the wave soldering equipment and realize accurate positioning operation.

[0035] The lower end sliding groove of the sliding block 3 is provided with the rubber pad 6 made of high-elastic wear-resistant rubber and fixed by the bolt one 7. During the sliding process of the sliding block, the rubber pad 6 can effectively buffer and absorb the shock, avoid the collision and wear of the sliding block and the track, ensure the stable and accurate movement of the clamp, and ensure the welding precision and quality of the electronic components.

[0036] The buffer rod 4 is internally provided with the buffer spring one 11, which can quickly respond when the clamp is vertically impacted, convert the impact force into elastic potential energy, store and slowly release the impact force, reduce the impact influence, and protect the clamp and the electronic components. The support base 10 at the upper end of the buffer rod 4 provides a stable support platform for the buffer box 14 and ensures the normal buffering and shock-absorbing function of the buffer box 14.

[0037] Support component 5: The triangular design provides strong stability. The crossbar 1 and support rod 2 are tightly connected by bolts 29 at both ends, which enhances the overall structural strength and prevents deformation and loosening under high temperature and high weight conditions, thus providing stable support for electronic components.

[0038] Rubber pad 6: Located in the groove of slider 3, it not only buffers and reduces shock, but also reduces friction noise between slider and track, improving the comfort of the working environment. It can also be adjusted by bolt 7 to adapt to different working conditions and ensure the welding accuracy and quality of electronic components.

[0039] Bolt 7: Precisely fixes the position of rubber pad 6, making it easy to adjust its tightness and ensuring that rubber pad 6 always maintains the best cushioning and anti-wear performance under different working conditions, thus extending the service life of the slider and track.

[0040] Mounting block 8: Its shape and size perfectly match the mounting slot of crossbar 1. The pin connection method is simple and efficient. It can withstand greater pressure stress in high temperature and high weight environments, ensuring the stability of the main support structure of the fixture and providing a solid foundation for the welding of electronic components.

[0041] Bolt 29: Tightly fix the support 5 between the crossbar 1 and the support rod 2. After tightening, the connection strength of the three can be significantly enhanced, effectively preventing loosening and deformation due to stress during operation, ensuring the overall stability of the fixture, and creating reliable conditions for the welding of electronic components.

[0042] Support frame 10: Provides stable support for buffer box 14, ensuring that it maintains a stable posture under vibration and impact, so that internal anti-vibration spring 15 and guide rod 16 and other components work stably, efficiently absorb and disperse vibration energy, reduce the impact on the welding quality of electronic components, and provide reliable buffer protection.

[0043] Buffer spring 11: When the fixture is subjected to vertical impact force, it quickly compresses and stores energy and releases it smoothly, effectively reducing the damage of instantaneous impact to the fixture and electronic components, improving welding quality and product reliability, and is an important part of the fixture buffer system.

[0044] Two oblique telescopic sleeves 12 are provided, located on both sides of the upper end of the buffer box 14. The lower connecting rod 17 is movably connected to the front end of the first guide rod 16, and the upper guide rod 18 is movably connected to the hinge seat 13. When subjected to impact or vibration, the oblique telescopic sleeve 12 extends and retracts along the second guide rod 18, and the internal buffer spring 19 works in coordination, together with the internal components of the buffer box 14, to provide all-round buffer protection for electronic components, enhancing stability and welding quality.

[0045] Hinge seat 13: Provides a flexible movable connection point for guide rod 18, allowing it to rotate within a certain range. This effectively adapts to the complex motion requirements of the buffer assembly under impact or vibration in different directions, ensuring that the buffer assembly can stably and efficiently perform its buffering function, protecting electronic components, and ensuring the smooth progress of the wave soldering process.

[0046] Buffer box 14: Installed on the support base 10, the guide rods 16 in the through holes on both sides provide precise guidance and stable support for the anti-vibration springs 15. When the fixture vibrates, the anti-vibration springs 15 extend and retract along the guide rods 16, efficiently absorbing and dispersing vibration energy, preventing electronic components from shifting or being damaged due to vibration, creating a stable welding environment for electronic components, and improving welding quality and product reliability.

[0047] Anti-vibration spring 15: Located inside the buffer box 14 and connected between the guide rods 16, it has excellent elasticity and shock absorption performance. When the fixture is vibrated, it quickly undergoes elastic deformation, converting the vibration energy into elastic potential energy and gradually dissipating it, effectively reducing the impact of vibration on electronic components, ensuring the stability and welding quality of electronic components during the welding process, and improving the overall reliability of electronic products.

[0048] Guide rod 16: Precisely fitted into the through holes on both sides of the buffer box 14, providing stable guidance and support for the anti-vibration spring 15, ensuring that the anti-vibration spring 15 always extends and contracts in the correct direction during vibration, efficiently absorbing and dispersing vibration energy, avoiding twisting and displacement, ensuring the buffering and shock absorption effect of the buffer box 14, providing a stable soldering environment for electronic components, and improving the quality and efficiency of wave soldering.

[0049] Connecting rod 17: Fixed to the lower end of the inclined telescopic sleeve 12, and movably connected to the front end of the guide rod 16. When the inclined telescopic sleeve 12 is subjected to impact or vibration and undergoes telescopic movement, the movement is promptly transmitted to the guide rod 16, so that the anti-vibration spring 15 in the buffer box 14 participates in the buffering and shock absorption process, realizing the close cooperation between the buffer assembly and the buffer box 14, providing comprehensive and efficient buffer protection for electronic components, and improving the stability and reliability of the wave soldering process.

[0050] Guide rod 2 18: It is sleeved in the through hole at the upper end of the inclined telescopic sleeve 12 and its two ends are movably connected to the hinge seat 13. It provides stable guidance and support for the inclined telescopic sleeve 12. When the fixture is subjected to impact or vibration, it ensures that the inclined telescopic sleeve 12 can extend and retract stably in its direction, ensuring the stability and reliability during the movement process. It enables the buffer component to effectively play its buffering role, reduces the impact of external impact and vibration on electronic components, provides a stable environment for electronic component soldering, and improves wave soldering quality and product reliability.

[0051] Buffer spring 19: Installed inside the inclined telescopic sleeve 12, with both ends fixedly connected to the guide rod 18 and the bottom surface of the inclined telescopic sleeve 12, respectively. When the fixture is subjected to impact or vibration from various directions, it compresses or extends with the telescopic sleeve 12, converting the impact force into elastic potential energy and gradually dissipating it. Together with components such as the anti-vibration spring 15 in the buffer box 14, it provides comprehensive and multi-layered buffer protection for electronic components, effectively reducing the impact of external impacts and vibrations on electronic components, significantly improving the stability and welding quality of electronic components during wave soldering, and strongly ensuring the reliability and stability of electronic products.

[0052] Working principle: The crossbar 1 and two support rods 2 constitute the main support structure of the fixture. The two support rods 2 are arranged in parallel, and their upper ends are fixedly connected to the mounting grooves at both ends of the crossbar 1 by mounting blocks 8. This connection method ensures the stability of the structure and can withstand the pressure and stress under high temperature and heavy load environments. The support member 5 is set as a triangle, and the bolts 9 at its upper and lower ends are threadedly connected to the threaded holes on the crossbar 1 and the support rods 2, respectively, which further enhances the connection strength between the crossbar and the support rods, ensuring that the entire fixture will not deform or loosen during operation, providing a stable support platform for electronic components during the welding process. The buffer rod 4 is located below the crossbar 1. At the center of the end, the buffer spring 11 at the lower end can provide initial cushioning when the fixture is subjected to vertical impact force, reducing the impact of instantaneous impact force on the fixture and electronic components. The anti-vibration spring 15 inside the buffer box 14 is guided and supported by the guide rod 16. When the fixture is vibrated, the anti-vibration spring can effectively absorb and disperse the vibration energy, reducing the impact of vibration on the soldering quality of electronic components, and ensuring that electronic components will not be displaced or damaged due to vibration during wave soldering. The inclined telescopic sleeve 12, connecting rod 17, guide rod 18 and buffer spring 19 in the buffer assembly work together to prevent the fixture from being subjected to impact force from various directions. When subjected to impact or vibration, the inclined telescopic sleeve 12 will extend or retract under the action of the guide rod 18, and the buffer spring 19 will compress or extend accordingly, converting the impact force into the elastic potential energy of the spring and gradually dissipating it, thereby further reducing the impact of external impact and vibration on electronic components and providing all-round buffer protection for electronic components. The two sliders 3 are respectively installed at the lower ends of the two support rods 2. The groove in the center of the lower end of the slider 3 cooperates with the external track to realize the sliding of the fixture, which facilitates positioning and operation in the wave soldering equipment. The rubber pad 6 at one end of the inner wall of the groove is fixed by bolt 7, which can play a role in buffering and shock absorption during the sliding of the slider. This design not only prevents wear and damage caused by collisions between the slider and the track, but also ensures that the fixture can move accurately and smoothly to the designated position for welding operations under high temperature and high pressure environments, thus ensuring the welding accuracy and quality of electronic components. Several heat dissipation grooves are opened at both ends of the upper surface of the crossbar 1. During the high temperature welding process, these heat dissipation grooves can increase the contact area between the crossbar and the air, promote heat dissipation, and prevent the fixture from overheating and deforming due to prolonged exposure to high temperature environments. This ensures the structural stability and service life of the fixture, and also helps to protect the electronic components being welded from the effects of excessively high temperatures, improving welding quality and product reliability.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature high-weight large-area wave crest welding clamp, comprising support rods (2) arranged in parallel in two, a cross rod (1) is fixedly installed at the upper end of the two support rods (2), a sliding block (3) is fixedly installed at the lower end of the two support rods (2) respectively, a buffer rod (4) is arranged at the lower end of the cross rod (1) centrally, a support piece (5) is installed at the upper end of the inner side of the two support rods (2) respectively, characterized in that, Also includes; The buffer assembly is fixedly installed at the lower end of the crossbar (1) and is used to reduce the external influence on the electronic components during transportation or operation.

2. The high temperature high mass area wave solder clamp of claim 1, wherein: The crossbar (1), the two support rods (2) and the buffer rod (4) are respectively made of high-temperature alloy steel.

3. The high temperature high mass area wave soldering fixture of claim 1, wherein: The lower end of each of the two sliding blocks (3) is provided with a sliding groove, and a rubber pad (6) is arranged at one end of the inner wall of the sliding groove. A bolt (7) is connected to the outer end of the rubber pad (6), and the other end of the bolt (7) extends to the outer end of the sliding block (3) through the inner wall of the sliding block (3).

4. The high temperature high mass area wave solder clamp of claim 2, wherein: The outer end of the crossbar (1) is provided with a mounting groove on both sides, and a threaded hole is formed in the inner side surface of the lower end of the two mounting grooves. A plurality of heat dissipation grooves are formed at both ends of the upper surface of the crossbar (1), and two hinge seats (13) are fixedly installed at the central lower end of the crossbar (1).

5. The high temperature high mass area wave solder clamp of claim 2, wherein: The upper end of each of the two support rods (2) is fixedly connected with a mounting block (8), and the outer end of each of the two mounting blocks (8) is inserted into the mounting groove formed at the two ends of the crossbar (1). Threaded holes are formed in the upper end of the opposite surfaces of the inner sides of the two support rods (2).

6. The high temperature high mass area wave solder clamp of claim 1, wherein: The support piece (5) is triangular, and a bolt (9) is arranged on the upper and lower surfaces of the support piece (5). The front ends of the two bolts (9) are threadedly connected to the threaded holes formed in the crossbar (1) and the support rod (2).

7. The high temperature high mass area wave solder clamp of claim 2, wherein: The lower end of the buffer rod (4) is provided with a buffer spring (11), and the upper end surface of the buffer rod (4) is fixedly connected with a support base (10). A buffer box (14) is fixedly installed at the central upper end surface of the support base (10). A through hole is formed in the two side surfaces of the buffer box (14), and a guide rod (16) is sleeved in the through hole. Anti-vibration springs (15) are fixedly connected to the inner opposite surfaces of the two guide rods (16) in the buffer box (14).

8. The high temperature high mass area wave solder clamp of claim 1, wherein: The buffer assembly includes two inclined telescopic sleeves (12), a connecting rod (17), a guide rod (18) and a buffer spring (19). The two inclined telescopic sleeves (12) are arranged at the upper ends of the two sides of the buffer box (14). The connecting rod (17) is fixedly installed at the lower end of each of the two inclined telescopic sleeves (12). The lower end of the connecting rod (17) is movably connected to the front end of the guide rod (16). A through hole is formed in the central upper end of each of the two inclined telescopic sleeves (12), and the guide rod (18) is sleeved in the through hole. The guide rod (18) is movably connected to the lower end of the hinge seat (13) at both ends. The rear end of the guide rod (18) is fixedly connected with the buffer spring (19) in the inclined telescopic sleeve (12), and the other end of the buffer spring (19) is fixedly connected to the inner bottom surface of the inclined telescopic sleeve (12).

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