A heavy duty buffer hinge

Abstract

The present invention is a heavy-duty buffer hinge, comprising a hinge cup, a rocker, a hinge arm, a base, and a crankshaft, wherein the hinge arm is mounted on the base, and the two ends of the rocker and the crankshaft are respectively hinged to the hinge cup and the hinge arm, and the hinge arm is also provided with an elastic energy storage component and a damper, and the elastic energy storage component comprises a fixed seat, an elastic member and a sliding member, the fixed seat is connected to the hinge arm, and the elastic member is located between the fixed seat and the sliding member, and the rear ends of the crankshaft and the rocker are respectively provided with swinging parts, and when the hinge cup is rotated to open relative to the hinge arm, the swinging part of the crankshaft can push the sliding member to move toward the rear end of the hinge arm, and at the same time, the sliding member compresses the elastic member, and the swinging part of the rocker can compress the damper when the hinge cup is rotated to close relative to the hinge arm. The present invention provides a closing force to the hinge cup through the elastic energy storage component, which reduces the assembly difficulty of the hinge, improves the assembly efficiency, and has a good mute effect when opening and closing the door, and also has a door closing buffer function to avoid a strong collision between the cabinet door and the cabinet body.

Description

Technical Field

[0001] The invention belongs to the technical field of hinges, and in particular relates to a heavy-duty buffer hinge. Background Art

[0002] Existing furniture door hinges generally use two elastic arms (extended ends) of a torsion spring to press on the connecting rod and the crankshaft respectively, so that the hinge cup has a closing force, such as the hinge disclosed in Chinese Patent Publication No. CN107905661A. This hinge that uses a torsion spring to provide closing force is difficult to assemble, and the two elastic arms of the torsion spring will slide relative to the connecting rod and the crankshaft regardless of whether the hinge cup is opening or closing, thereby generating noise due to friction. Summary of the invention

[0003] In view of the deficiencies of the prior art, an object of the present invention is to provide a heavy-duty buffer hinge that is easy to assemble.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a heavy-duty buffer hinge, including a hinge cup, a rocker, a hinge arm, a base, and a crankshaft, wherein the hinge arm is installed on the base, a first axial hole is provided at the front end of the rocker, a second axial hole is provided at the rear end of the rocker, a third axial hole is provided at the front end of the crankshaft, and a fourth axial hole is provided at the rear end of the crankshaft. The front end of the rocker is hinged to the hinge cup through the first hinge axis through the first axial hole, the rear end of the rocker is hinged to the hinge arm through the second hinge axis through the second axial hole, the front end of the crankshaft is hinged to the hinge cup through the third hinge axis through the third axial hole, the rear end of the crankshaft is hinged to the hinge arm through the fourth hinge axis through the fourth axial hole, and the hinge arm is also provided with an elastic energy storage component, the elastic energy storage component includes a fixed seat, an elastic member and a sliding member, the fixed seat is connected to the hinge arm, the elastic member is located between the fixed seat and the sliding member, and the sliding member is located on the side of the fixed seat corresponding to the crankshaft, the rear end of the crankshaft is also provided with a crankshaft swinging part, and when the hinge cup is rotated and opened relative to the hinge arm, the crankshaft swinging part of the crankshaft can push the sliding member to move toward the rear end of the hinge arm, and the sliding member compresses the elastic member.

[0005] In the above scheme, when the hinge cup rotates and opens relative to the hinge arm, the crankshaft rotates and drives the crankshaft swinging part at its rear end to swing around the fourth hinge axis. During the swinging process of the crankshaft swinging part, the sliding part is pushed to move toward the rear end of the hinge arm to compress the elastic part. After the elastic part is compressed, energy is stored. At this time, when the door needs to be closed, the elastic part is automatically reset after being compressed, thereby pushing the sliding part to move toward the front end of the hinge arm, and at the same time pushing the crankshaft swinging part to swing in the opposite direction around the fourth hinge axis, thereby driving the crankshaft and the rocker to rotate around the circle so that the hinge cup rotates and closes relative to the hinge arm, thereby achieving the effect of automatic door closing. The present invention provides closing force to the hinge cup through an elastic energy storage component, and does not need to use a torsion spring to provide closing force, thereby reducing the assembly difficulty of the hinge and improving assembly efficiency.

[0006] Furthermore, the above-mentioned hinge arm is also provided with a damper, and the rear end of the rocker is also provided with a rocker swinging part. When the hinge cup rotates and closes relative to the hinge arm, the rocker swinging part of the rocker can compress the damper. Due to the damping effect of the damper, the hinge cup rotates slowly in the closing direction, so that the door closing process is carried out slowly, avoiding strong collision between the cabinet door and the cabinet body.

[0007] Furthermore, the rear end of the damper is fixed on a fixed seat to facilitate the installation of the damper. A push block is provided at the front end of the damper. When the hinge cup rotates and closes relative to the hinge arm, the rocker swing part slides relative to the push block and pushes the push block to move toward the rear end of the hinge arm to compress the damper. When the hinge cup rotates and opens relative to the hinge arm, the damper automatically resets and pushes the push block to move toward the front end of the hinge arm. This solution allows the door to close slowly, and the door opening is not affected by the damper, making it easy to open the door.

[0008] Furthermore, the above-mentioned sliding member has a critical contact portion on one side corresponding to the crankshaft swinging portion. When the crankshaft swinging portion and the critical contact portion conflict with each other, the compression amount of the elastic member is the largest; when the conflicting portion between the crankshaft swinging portion and the sliding member is located on one side of the critical contact portion, the elastic member remains in a compressed state, and the crankshaft swinging portion and the sliding member remain relatively stationary, and the hinge cup is in an open state; when the conflicting portion between the crankshaft swinging portion and the sliding member is located on the other side of the critical contact portion, and the conflicting portion between the crankshaft swinging portion and the sliding member is away from the critical contact portion, the elastic member automatically resets, the crankshaft swinging portion and the sliding member slide relative to each other, and the hinge cup rotates and closes relative to the hinge arm. This solution can achieve that the hinge cup is in an open state without automatically closing.

[0009] Furthermore, the above-mentioned crankshaft swinging part has a roller, which contacts with the sliding member, and when the hinge cup rotates relative to the hinge arm, the roller can roll on the sliding member, effectively reducing the noise generated by friction.

[0010] Furthermore, in order to facilitate the installation of the roller, the above-mentioned crankshaft swing part includes support plates arranged on the left and right sides of the rear end of the crankshaft, the two support plates are respectively provided with fifth axial holes, and the two ends of a roller shaft are passed through the fifth axial holes of the two support plates. The roller is located between the two support plates and is sleeved on the outside of the roller shaft.

[0011] Furthermore, the first shaft hole, the second shaft hole, the third shaft hole, and the fourth shaft hole are respectively provided with shaft sleeves, and the shaft sleeves include an inner ring and an outer ring provided at the end of the inner ring, wherein the diameter of the outer ring is larger than the diameter of the inner ring, the inner ring is sleeved in the shaft hole, and the outer ring is located outside the shaft hole. This solution uses shaft sleeves to prevent the rocker and crankshaft from directly contacting the hinge cup, hinge arm, and hinge shaft, thereby reducing friction resistance, increasing wear resistance, and improving the overall life of the hinge, while also reducing noise generation.

[0012] Furthermore, a limiting structure is provided between the inner ring of the sleeve located in the first shaft hole, the second shaft hole, and the third shaft hole and the inner wall of the corresponding shaft hole, and a positioning block is extended on the outer side of the outer ring of the sleeve located in the fourth shaft hole along the direction of the crankshaft swinging part, and an axis groove is provided on the inner side of the positioning block at a position corresponding to the fifth shaft hole, and the end of the roller shaft is inserted into the axis groove of the corresponding side positioning block. In this way, the sleeve can only slide relative to the hinge shaft, but not relative to the shaft hole, which can improve the life of the sleeve.

[0013] Furthermore, the above-mentioned elastic member is a coil spring, and a spring hole is provided at the front end of the fixed seat corresponding to the rear end of the coil spring, and a spring column is provided on the rear side of the sliding member corresponding to the front end of the coil spring. The front end of the coil spring is sleeved on the outside of the spring column of the sliding member, and the rear end of the coil spring is inserted into the spring hole of the fixed seat. This facilitates the assembly of the coil spring with the fixed seat and the sliding member, and the installation stability of the coil spring is better.

[0014] The hinge of the present invention provides closing force to the hinge cup through an elastic energy storage component, and the damper is assembled together with the elastic energy storage component, which reduces the difficulty of assembling the hinge and improves the assembly efficiency; the rocker and crankshaft are isolated from the hinge cup, hinge arm and hinge shaft by bushings, and the swinging part of the crankshaft contacts the sliding part through rollers, which can reduce friction resistance, increase wear resistance, and improve the overall life of the hinge, while also reducing noise generation and improving the quiet effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a heavy-duty buffer hinge according to an embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the structural decomposition of a heavy-duty buffer hinge according to an embodiment of the present invention.

[0017] Figure 3 It is a partial cross-sectional view of the heavy-duty buffer hinge in the open state according to the embodiment of the present invention.

[0018] Figure 4 It is a partial cross-sectional view of the heavy-duty buffer hinge in the closed state according to an embodiment of the present invention.

[0019] Figure 5 It is a schematic diagram of the assembled state of the crankshaft, sleeve and roller according to an embodiment of the present invention.

[0020] Figure 6 for Figure 5 Schematic diagram of the structural decomposition.

[0021] Figure 7 It is a schematic diagram of the shaft sleeve structure located at the first, second and third shaft hole positions according to an embodiment of the present invention.

[0022] Figure 8 Schematic diagram of the assembly state of the rocker and the shaft sleeve according to an embodiment of the present invention.

[0023] Fig. 9 for Figure 8 Schematic diagram of the structural decomposition.

[0024] Fig.10 It is a schematic diagram of the shaft sleeve structure located at the fourth shaft hole position according to an embodiment of the present invention.

[0025] Fig.11 It is a schematic diagram of the assembly state of the elastic energy storage component and the damper according to an embodiment of the present invention.

[0026] Fig.12 for Fig.11 Schematic diagram of the structural decomposition. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings, which are only used for exemplary description and cannot be understood as limiting the present invention.

[0028] In order to more concisely describe the present embodiment, some parts that are well known to those skilled in the art but not related to the main content of the present invention will be omitted in the drawings or descriptions. In addition, for the convenience of description, some parts in the drawings will be omitted, enlarged or reduced, but they do not represent the size or entire structure of the actual product. In addition, the descriptions of the front, back, left, right, up, down, clockwise, counterclockwise and other directions in the embodiments are all based on the relative directions of the placement state of the drawings, and do not represent the relative directions of the actual product.

[0029] Example

[0030] like Figure 1-12 As shown, this embodiment provides a heavy-duty buffer hinge, including a hinge cup 1, a rocker 2, a hinge arm 3, a base 4, a damper 5, a crankshaft 6 and an elastic energy storage component 7, wherein the cross-section of the hinge arm 3 is similar to a door shape, the hinge arm 3 is installed on the base 4, the front end of the rocker 2 is provided with a first axial hole 81, the rear end of the rocker 2 is provided with a second axial hole 82, the front end of the crankshaft 6 is provided with a third axial hole 83, and the rear end of the crankshaft 6 is provided with a fourth axial hole 84, the front end of the rocker 2 is hinged to the hinge cup 1 through a first hinge axis 91 passing through the first axial hole 81 and the axial hole 10 of the hinge cup 1, the rear end of the rocker 2 is hinged to the upper front end of the hinge arm 3 through a second hinge axis 92 passing through the second axial hole 82, the front end of the crankshaft 6 is hinged to the hinge cup 1 through a third hinge axis 93 passing through the third axial hole 83 and the axial hole 11 of the hinge cup 1, the rear end of the crankshaft 6 is hinged to the upper front end of the hinge arm 3 through a fourth hinge axis 94 passing through the fourth axial hole 84, and the rocker 2 is located on the upper side of the crankshaft 6.

[0031] The above-mentioned elastic energy storage component 7 includes a fixed seat 71, an elastic member 72 and a sliding member 73. The fixed seat 71 is located in the hinge arm 3, and the left and right side walls of the fixed seat 71 are against the side walls of the hinge arm 3. The rear end of the fixed seat 71 is connected to the side walls of the hinge arm 3 through two connecting holes 710 at its rear end via two connecting pins 96, so that the fixed seat 71 is stably fixed in the hinge arm 3. The rear end of the elastic member 72 is connected to the fixed seat 71, and the front end of the elastic member 72 is connected to the sliding member 73, and the sliding member 73 is located on the front side of the fixed seat 71. The rear end of the crankshaft 6 is also provided with a crankshaft swinging part 61, and when the hinge cup 1 rotates relative to the hinge arm 3, the crankshaft swinging part 61 of the crankshaft 6 can slide up and down along the front side of the sliding member 73. The rear end of the damper 5 is fixed on the fixing seat 71 , and the damper 5 is located above the sliding member 73 . The rear end of the rocker 2 is also provided with a rocker swinging portion 21 . When the hinge cup 1 rotates and closes relative to the hinge arm 3 , the rocker swinging portion 21 of the rocker 2 can compress the damper 5 .

[0032] When the above hinge is used, Figure 3 , 4 As shown, when the hinge cup 1 is rotated and opened relative to the hinge arm 2, the crankshaft 6 and the rocker 2 rotate clockwise, wherein the crankshaft 1 rotates to drive the crankshaft swinging part 61 at its rear end to swing clockwise around the fourth hinge axis 94, and during the clockwise swinging process, the crankshaft swinging part 61 slides downward along the front side of the sliding member 73 and pushes the sliding member 73 to move toward the rear end of the hinge arm 1, thereby compressing the elastic member 72, and the elastic member 72 is compressed to store energy. At this time, when the door needs to be closed, the elastic member 72 is compressed and automatically resets forward, thereby pushing the sliding member 73 to move toward the front end of the hinge arm 1. At the same time, the sliding member 73 pushes the crankshaft swinging part 61 to swing counterclockwise around the fourth hinge axis 94, thereby driving the crankshaft 6 and the rocker 2 to rotate counterclockwise so that the hinge cup 1 rotates and closes relative to the hinge arm 2, thereby achieving an automatic door closing effect. When the rocker 2 rotates counterclockwise, it will also drive the rocker swinging part 21 at its rear end to compress the damper 5. Due to the damping effect of the damper 5, the hinge cup 1 rotates slowly in the closing direction, so that the door closing process is carried out slowly, avoiding a strong collision between the cabinet door and the cabinet body.

[0033] As a relatively preferred solution of this embodiment, Fig.11 , 12As shown, the elastic member 72 is a coil spring, a spring hole 711 is provided at the front end of the fixed seat 71 at a position corresponding to the rear end of the coil spring, a spring column 731 is provided at the rear side of the sliding member 73 at a position corresponding to the front end of the coil spring, the front end of the coil spring is sleeved on the outside of the spring column 731 of the sliding member 73, and the rear end of the coil spring is inserted into the spring hole 711 of the fixed seat 71, so that the assembly of the coil spring with the fixed seat 71 and the sliding member 73 is convenient, and the installation stability of the coil spring is better. The front end surface of the fixed seat 71 is also provided with a damper fixing hole 712 at the rear end position of the damper 5, and the rear end of the damper 5 is inserted into the damper fixing hole 712, so that the damper 5 is conveniently installed stably. A push block 51 is provided at the front end of the damper 5. When the hinge cup 1 rotates and closes relative to the hinge arm 3, the rocker swing portion 21 slides relative to the push block 51 and pushes the push block 51 to move toward the rear end of the hinge arm 3 to compress the damper 5. When the hinge cup 1 rotates and opens relative to the hinge arm 3, the damper 5 automatically resets and pushes the push block 51 to move toward the front end of the hinge arm 3. In this way, the door closing process is carried out slowly, and the door opening is not affected by the damper, which facilitates the door opening.

[0034] like Fig.12 As shown, the damper 5 of this embodiment includes a cylinder body 52 and a piston rod 53, the piston rod 53 can be extended and retracted relative to the cylinder body 52, and the rear end of the cylinder body 52 is inserted into the damper fixing hole 712; and the push block 51 includes a connecting block 512 and a sliding block 511, the sliding block 511 is made of wear-resistant plastic, the connecting block 512 and the sliding block 511 are detachably connected, the connecting block 512 is connected to the front end of the piston rod 53, the sliding block 511 is located at the front end of the connecting block 512, and the front end surface of the sliding block 511 has an arc surface 513. When the hinge cup 1 rotates relative to the hinge arm 3, the rocker swing part 21 slides on the arc surface 513, so that the friction noise when the rocker swing part 21 and the sliding block 511 slide relative to each other can be reduced, and the hinge cup 1 is more evenly and smoothly rotated and closed relative to the hinge arm 3.

[0035] In this embodiment, the front side surface of the above-mentioned sliding member 73 has a critical contact portion. When the crankshaft swing part 61 conflicts with the critical contact portion, the compression amount of the above-mentioned coil spring is the largest (that is, the length of the coil spring becomes the shortest after being compressed); when the conflicting portion between the crankshaft swing part 61 and the sliding member 73 is located at the lower side of the critical contact portion, the elastic member 72 remains in a compressed state, and the crankshaft swing part 61 and the sliding member 73 remain relatively stationary, and the hinge cup 1 is in an open state. In the absence of external force, the hinge cup 1 will not automatically rotate and close relative to the hinge arm 3, and the door body is kept in an open state; when the conflicting portion between the crankshaft swing part 61 and the sliding member 73 is located at the upper side of the critical contact portion, and the conflicting portion between the crankshaft swing part 61 and the sliding member 73 moves upward away from the critical contact portion, the coil spring automatically resets gradually (that is, the coil spring gradually stretches), the crankshaft swing part 61 slides upward relative to the sliding member 73, and the hinge cup 1 automatically rotates and closes relative to the hinge arm 3, thereby realizing automatic door closing.

[0036] In order to reduce the friction between the crankshaft swing part 61 and the sliding member 73 and reduce the noise, the crankshaft swing part 61 has a roller 62, which contacts the sliding member 73 to form the above-mentioned contact part. When the hinge cup 1 rotates relative to the hinge arm 3, the roller 62 rolls on the front side of the sliding member 73, which can reduce the wear speed of the crankshaft swing part 61 and the sliding member 73, increase the life of the hinge, and have a better mute effect. Figure 5 , 6 As shown, the crankshaft swinging portion 61 of the present embodiment includes support plates 60 arranged on the left and right sides of the rear end of the crankshaft 6, the two support plates 60 are respectively provided with a fifth shaft hole 85, both ends of a roller shaft 95 are passed through the fifth shaft hole 85 of the two support plates 60, and the roller 62 is located between the two support plates 60 and is sleeved on the outside of the roller shaft 95, which facilitates the installation of the roller 62.

[0037] Similarly, as an improved solution of this embodiment, Figure 5-10 As shown, the first shaft hole 81, the second shaft hole 82, the third shaft hole 83 and the fourth shaft hole 84 are respectively provided with shaft sleeves 90, and the shaft sleeves 90 are made of wear-resistant plastic material. The shaft sleeves 90 include an inner ring 901 and an outer ring 902 arranged at the end of the inner ring 901, wherein the diameter of the outer ring 902 is larger than the diameter of the inner ring 901, the inner ring 901 is sleeved in the shaft hole, and the outer ring 902 is located outside the shaft hole, and the shaft hole and the hinge shaft are isolated by the inner ring 901, and the outer ring 902 isolates the rocker 2 and the crankshaft 6 from the hinge cup 1 and the hinge arm 3. Since the rocker 2, the crankshaft 6, the hinge cup 1 and the hinge arm 3 are generally made of metal, this can avoid direct contact between these metal parts of the hinge, which is easy to cause accelerated wear, thereby increasing the life of the hinge, and at the same time avoid the direct contact and friction of the metal parts to generate a large noise, which is beneficial to improving the quiet effect. In addition, a limiting structure is provided between the inner ring 901 of the sleeve 90 located at the first shaft hole 81, the second shaft hole 82, and the third shaft hole 83 and the inner wall of the corresponding shaft hole. The limiting structure of this embodiment is a convex rib 904 provided on the outer side of the inner ring 901 and a groove 80 provided on the inner hole wall of the first shaft hole 81, the second shaft hole 82, and the third shaft hole 83. The inner ring 901 cooperates with the groove 80 of the corresponding shaft hole through its convex rib 904, so that the sleeve 90 will not slide relative to the shaft hole, thereby reducing the sleeve 9 0 wear rate, which can increase the life of the sleeve 90; and a positioning block 903 is extended on the outer side of the outer ring 902 of the sleeve 90 located in the fourth shaft hole 84 along the direction of the crankshaft swing part 61, and an axis groove 9031 is opened on the inner side of the positioning block 903 at a position corresponding to the fifth shaft hole 85, and the end of the roller shaft 95 is inserted into the axis groove 9031 of the corresponding side positioning block 903, which can also prevent the sleeve 90 from sliding relative to the shaft hole, and can also limit the roller shaft 95, thereby improving the stability of the structure.

[0038] The hinge of the present invention has good mute effect when in use, the moving space of each component along the axial direction of the hinge shaft is restricted, the load-bearing is stable, and the service life is long.

[0039] The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A heavy-duty buffer hinge, comprising a hinge cup (1), a rocker (2), a hinge arm (3), a base (4), and a crankshaft (6), wherein: The hinge arm (3) is mounted on the base (4); the front end of the rocker (2) is provided with a first shaft hole (81); the rear end of the rocker (2) is provided with a second shaft hole (82); the front end of the crankshaft (6) is provided with a third shaft hole (83); the rear end of the crankshaft (6) is provided with a fourth shaft hole (84); the front end of the rocker (2) is hinged to the hinge cup (1) through a first hinge shaft (91) passing through the first shaft hole (81); the rear end of the rocker (2) is hinged to the hinge arm (3) through a second hinge shaft (92) passing through the second shaft hole (82); the front end of the crankshaft (6) is hinged to the hinge cup (1) through a first hinge shaft (91) passing through the first shaft hole (81); The three hinge shafts (93) pass through the third shaft hole (83) and are hinged to the hinge cup (1); the rear end of the crankshaft (6) passes through the fourth shaft hole (84) and is hinged to the hinge arm (3) via the fourth hinge shaft (94); the hinge arm (3) is further provided with an elastic energy storage component (7); the elastic energy storage component (7) comprises a fixed seat (71), an elastic member (72) and a sliding member (73); the fixed seat (71) is connected to the hinge arm (3); the elastic member (72) is located between the fixed seat (71) and the sliding member (73); and the sliding member (73) is provided with an elastic energy storage component (7). The member (73) is located on a side of the fixed seat (71) corresponding to the crankshaft (6); the rear end of the crankshaft (6) is also provided with a crankshaft swinging portion (61); and when the hinge cup (1) is rotated to open relative to the hinge arm (3), the crankshaft swinging portion (61) of the crankshaft (6) can push the sliding member (73) to move toward the rear end of the hinge arm (3), and at the same time, the sliding member (73) compresses the elastic member (72); the hinge arm (3) is also provided with a damper (5), and the rear end of the rocker (2) is also provided with a rocker swinging portion (21). When the hinge cup (1) is relative to the hinge arm, the hinge cup (1) is rotated to open relative to the hinge arm. (3) When the rocker (2) is rotated to close, the rocker swinging portion (21) of the rocker (2) can compress the damper (5); the elastic member (72) is a coil spring, the front end of the fixed seat (71) is provided with a spring hole (711) at a position corresponding to the rear end of the coil spring, the rear side of the sliding member (73) is provided with a spring column (731) at a position corresponding to the front end of the coil spring, the front end of the coil spring is sleeved on the outside of the spring column (731) of the sliding member (73), and the rear end of the coil spring is inserted into the spring hole (711) of the fixed seat (71).

2. The heavy-duty buffer hinge according to claim 1, characterized in that: The rear end of the damper (5) is fixed on the fixing seat (71), and the front end of the damper (5) is provided with a push block (51). When the hinge cup (1) rotates and closes relative to the hinge arm (3), the rocker swing part (21) and the push block (51) slide relative to each other and push the push block (51) to move toward the rear end of the hinge arm (3) to compress the damper (5). When the hinge cup (1) rotates and opens relative to the hinge arm (3), the damper (5) automatically resets and pushes the push block (51) to move toward the front end of the hinge arm (3).

3. The heavy-duty buffer hinge according to claim 1, characterized in that: The sliding member (73) has a critical contact portion on one side corresponding to the crankshaft swinging portion (61); when the crankshaft swinging portion (61) and the critical contact portion are in contact, the compression amount of the elastic member (72) is maximum; when the contact portion between the crankshaft swinging portion (61) and the sliding member (73) is located on one side of the critical contact portion, the elastic member (72) remains in a compressed state, and the crankshaft swinging portion (61) and the sliding member (73) remain relatively stationary, and the hinge cup (1) is in an open state; when the contact portion between the crankshaft swinging portion (61) and the sliding member (73) is located on the other side of the critical contact portion, and the contact portion between the crankshaft swinging portion (61) and the sliding member (73) is moving away from the critical contact portion, the elastic member (72) automatically resets, the crankshaft swinging portion (61) and the sliding member (73) slide relative to each other, and the hinge cup (1) rotates relative to the hinge arm (3) to close.

4. The heavy-duty buffer hinge according to claim 1, characterized in that: The crankshaft swinging part (61) has a roller (62), the roller (62) is in contact with a sliding member (73), and when the hinge cup (1) rotates relative to the hinge arm (3), the roller (62) can roll on the sliding member (73).

5. The heavy-duty buffer hinge according to claim 4, characterized in that: The crankshaft swinging part (61) comprises support plates (60) arranged on the left and right sides of the rear end of the crankshaft (6), the two support plates (60) are respectively provided with a fifth shaft hole (85), the two ends of a roller shaft (95) are passed through the fifth shaft holes (85) of the two support plates (60), and the roller (62) is located between the two support plates (60) and is sleeved on the outside of the roller shaft (95).

6. The heavy-duty buffer hinge according to claim 5, characterized in that: The first axial hole (81), the second axial hole (82), the third axial hole (83), and the fourth axial hole (84) are respectively provided with a shaft sleeve (90), and the shaft sleeve (90) includes an inner ring (901) and an outer ring (902) arranged at the end of the inner ring (901), wherein the diameter of the outer ring (902) is greater than the diameter of the inner ring (901), the inner ring (901) is sleeved in the axial hole, and the outer ring (902) is located outside the axial hole.

7. The heavy-duty buffer hinge according to claim 6, characterized in that: A limiting structure is provided between the inner ring (901) of the shaft sleeve (90) located at the first shaft hole (81), the second shaft hole (82) and the third shaft hole (83) and the inner wall of the corresponding shaft hole, and a positioning block (903) is extended along the direction of the crankshaft swinging part (61) on the outer side of the outer ring (902) of the shaft sleeve (90) located at the fourth shaft hole (84), and an axis groove (9031) is provided on the inner side of the positioning block (903) at a position corresponding to the fifth shaft hole (85), and the end of the roller shaft (95) is inserted into the axis groove (9031) of the corresponding side positioning block (903).

8. The heavy-duty buffer hinge according to claim 1, characterized in that: The first axial hole (81), the second axial hole (82), the third axial hole (83), and the fourth axial hole (84) are respectively provided with a shaft sleeve (90), and the shaft sleeve (90) includes an inner ring (901) and an outer ring (902) arranged at the end of the inner ring (901), wherein the diameter of the outer ring (902) is greater than the diameter of the inner ring (901), the inner ring (901) is sleeved in the axial hole, and the outer ring (902) is located outside the axial hole.

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