Double-hydraulic-cylinder type hydraulic spring hinge

Abstract

The utility model provides a double-hydraulic-cylinder type hydraulic spring hinge which comprises a shell, a cam shaft arranged in the shell in a penetrating mode, a main hydraulic cylinder body installed in the shell in a sliding mode and an auxiliary hydraulic cylinder body installed in the shell in a sliding mode. The auxiliary hydraulic cylinder body and the main hydraulic cylinder body are arranged on the two sides of the cam shaft respectively, the main hydraulic cylinder body abuts against the nearest point of the rotating center of the cam shaft, and the auxiliary hydraulic cylinder body abuts against the farthest point of the rotating center of the cam shaft. The auxiliary hydraulic cylinder body is used for providing hydraulic buffering when the auxiliary hydraulic cylinder body is subjected to external force in the same direction in the door closing process. The double-hydraulic-cylinder type hydraulic spring hinge overcomes the defect that the hydraulic damping effect of an existing hydraulic spring hinge is prone to losing when the existing hydraulic spring hinge is subjected to external force in the same direction in the door closing process.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic spring hinges, and in particular to a dual hydraulic cylinder type hydraulic spring hinge. Background Technology

[0002] Hinges, as components that connect two solid objects and allow them to rotate relative to each other, are widely used in doors, windows, furniture, and many other fields. As people's demands for quality of life and user experience increase, traditional hinges have gradually become insufficient in terms of functionality, leading to the development of hydraulic hinges. Hydraulic hinges, based on ordinary hinges, add a hydraulic damping system; the rotation speed of the pivot is controlled by the flow of hydraulic oil in a sealed cavity, achieving buffering and speed regulation functions for the opening and closing of doors, windows, or furniture doors.

[0003] In existing technology, a hydraulic spring hinge includes a housing, a camshaft inserted into the housing, and a hydraulic cylinder slidably mounted within the housing. One end of the hydraulic cylinder rests against the camshaft, and a hydraulic damping component is installed within the hydraulic cylinder to generate a damping effect. Under normal use, when opening the door, the hydraulic cylinder moves from the closest point to the farthest point of the camshaft's rotation center, and the camshaft pushes the hydraulic cylinder to move. When closing the door, the hydraulic cylinder moves from the farthest point to the closest point of the camshaft's rotation center, and the hydraulic damping component generates a damping effect, causing the hydraulic cylinder to slowly return to its original position. However, if a sudden external force is applied in the same direction during the closing process, the door leaf accelerates to close, while the hydraulic cylinder slowly returns to its original position. This can easily cause the hydraulic cylinder to detach from the camshaft surface, thus losing its hydraulic damping effect and resulting in poor performance. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The problem to be solved by this utility model is to provide a dual hydraulic cylinder type hydraulic spring hinge to overcome the defect of existing hydraulic spring hinges that easily lose hydraulic damping effect when subjected to external force in the same direction during the closing process.

[0006] (II) Technical Solution

[0007] To solve the aforementioned technical problem, this utility model provides a dual-hydraulic-cylinder type hydraulic spring hinge, including a housing, a camshaft passing through the housing, and a main hydraulic cylinder slidably installed in the housing, and also including an auxiliary hydraulic cylinder slidably installed in the housing. The auxiliary hydraulic cylinder and the main hydraulic cylinder are respectively arranged on both sides of the camshaft. The main hydraulic cylinder is positioned at the closest point to the rotation center of the camshaft, and the auxiliary hydraulic cylinder is positioned at the farthest point to the rotation center of the camshaft. The auxiliary hydraulic cylinder is used to provide hydraulic cushioning when subjected to an external force in the same direction during the closing process.

[0008] In some embodiments, the camshaft is provided with a cam portion, a groove is formed on one side of the cam portion, and a first push head adapted to the groove is provided at the end of the main hydraulic cylinder; first cam walls are symmetrically and spaced apart on the outer wall of the cam portion, a second cam wall is recessed between the two first cam walls, and a second push head is provided on the auxiliary hydraulic cylinder that abuts against the second cam wall; the first cam walls are used to push the main hydraulic cylinder to slide, and the second cam wall is used to push the auxiliary hydraulic cylinder to slide.

[0009] In some embodiments, a first hydraulic damping component is installed in the main hydraulic cylinder, and a second hydraulic damping component is installed in the auxiliary hydraulic cylinder; when closing the door, the main hydraulic cylinder moves from the farthest point of the camshaft rotation center to the nearest point, and the first hydraulic damping component produces a hydraulic damping effect; the auxiliary hydraulic cylinder moves from the nearest point of the camshaft to the farthest point, and the second hydraulic damping component produces a hydraulic damping effect.

[0010] In some embodiments, the first hydraulic damping assembly includes a first piston rod, a first piston, and a first baffle ring. One end of the first piston rod is fixedly connected to the housing, and the other end is inserted into the main hydraulic cylinder and fixed with the first piston. The first piston divides the inner cavity of the main hydraulic cylinder into a first piston left cavity and a first piston right cavity, and a first pressure relief gap is formed between the first piston and the main hydraulic cylinder. The first baffle ring is slidably mounted on the first piston and is used to open and close the first pressure relief gap. A first return flow hole is provided inside the first piston, and the first piston right cavity is connected to the first piston left cavity through the first return flow hole.

[0011] In some embodiments, the first hydraulic damping assembly further includes a guide seat placed in the left cavity of the first piston. The guide seat is mounted on the first piston rod and abuts against the first piston. The guide seat has a first through hole symmetrically arranged inside it, and a second through hole symmetrically arranged at one end of the guide seat facing the first piston. The left cavity of the first piston communicates with the first pressure relief gap through the first through hole and the second through hole in sequence. A guide ring is sleeved on the guide seat, and a notch is opened on the guide ring.

[0012] In some embodiments, the first piston is provided with a plurality of first pressure relief grooves at equal intervals in an annular shape, and the first pressure relief gap is connected to the right cavity of the first piston through the first pressure relief grooves; one end of the first piston is provided with a first annular flange, and the first annular flange and the main hydraulic cylinder body form the first pressure relief gap; the other end of the first piston is fitted with a first limiting ring, and the first flow-blocking ring can slide between the first annular flange and the first limiting ring.

[0013] In some embodiments, the second hydraulic damping assembly includes a second piston rod, a second piston, and a second baffle ring. One end of the second piston rod is fixedly connected to the housing, and the other end is inserted into the auxiliary hydraulic cylinder and fixed with the second piston. The second piston divides the inner cavity of the auxiliary hydraulic cylinder into a left chamber and a right chamber, and a second pressure relief gap is formed between the second piston and the auxiliary hydraulic cylinder. The second baffle ring is slidably mounted on the second piston and is used to open and close the second pressure relief gap. A second return flow hole is provided inside the second piston, and the right chamber of the second piston communicates with the left chamber of the second piston through the second return flow hole. A second limiting ring is fitted on the second piston and is used to limit the second baffle ring.

[0014] In some embodiments, a cylindrical groove extends along the length of the housing, and both the auxiliary hydraulic cylinder and the main hydraulic cylinder are placed in the cylindrical groove. L-shaped seats for covering the cylindrical groove are symmetrically installed at both ends of the housing. A camshaft hole is provided in the housing and arranged perpendicular to the cylindrical groove, and the camshaft is placed in the camshaft hole.

[0015] In some embodiments, a first spring is installed between the main hydraulic cylinder and the housing, and a second spring is installed between the auxiliary hydraulic cylinder and the housing.

[0016] (III) Beneficial Effects

[0017] This utility model provides a dual-hydraulic cylinder type hydraulic spring hinge, which adds an auxiliary hydraulic cylinder and a second hydraulic damping component. During normal door closing, both the first and second hydraulic damping components can generate hydraulic damping effects, resulting in better overall damping and a better door closing effect. When the door is subjected to an external force in the same direction during the closing process, the main hydraulic cylinder is prone to disengaging from the camshaft and losing its hydraulic damping effect. However, since the auxiliary hydraulic cylinder moves from the closest point to the farthest point of the camshaft, it can always maintain contact with the camshaft. Under the hydraulic damping effect generated by the second hydraulic damping component, it can buffer the door and prevent accidental damage to the door, ensuring the effectiveness of use. This overcomes the defect of existing hydraulic spring hinges that are prone to losing their hydraulic damping effect when subjected to an external force in the same direction during the closing process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of a dual-hydraulic-cylinder hydraulic spring hinge according to the present invention.

[0020] Figure 2 This is an exploded view of a dual-hydraulic-cylinder hydraulic spring hinge according to this utility model;

[0021] Figure 3 This is a cross-sectional view of a dual-hydraulic cylinder type hydraulic spring hinge according to the present invention;

[0022] Figure 4 This is a perspective view of the connection between the main hydraulic cylinder, auxiliary hydraulic cylinder, and camshaft of a dual-hydraulic cylinder type hydraulic spring hinge according to this utility model.

[0023] Figure 5 This is a perspective view of the connection between the main hydraulic cylinder and the camshaft of a dual-hydraulic-cylinder hydraulic spring hinge according to this utility model.

[0024] Figure 6 This is a perspective view of a dual-hydraulic-cylinder hydraulic spring hinge camshaft according to the present invention.

[0025] Figure 7 This is a schematic diagram of the connection between the main hydraulic cylinder and the first hydraulic damping component of a dual-hydraulic cylinder type hydraulic spring hinge according to this utility model.

[0026] Figure 8 This is a perspective view of the first hydraulic damping component of a dual-hydraulic cylinder hydraulic spring hinge according to this utility model.

[0027] Figure 9 This is an exploded view of the first hydraulic damping component of a dual-hydraulic cylinder hydraulic spring hinge according to this utility model.

[0028] Figure 10 This is a schematic diagram of the structure of the auxiliary hydraulic cylinder body and the second hydraulic damping component of the dual hydraulic cylinder type hydraulic spring hinge of this utility model.

[0029] Figure 11 This is an exploded view of the second hydraulic damping component of a dual-hydraulic cylinder hydraulic spring hinge according to this utility model.

[0030] The component names corresponding to the various reference numerals in the figure are as follows: 1. Housing; 101. Cylindrical groove; 102. Camshaft hole; 2. Camshaft; 201. Cam portion; 202. Groove; 203. First cam wall; 204. Second cam wall; 3. Main hydraulic cylinder body; 301. First mandrel; 302. Left chamber of the first piston; 303. Right chamber of the first piston; 304. First pressure relief gap; 4. Auxiliary hydraulic cylinder body; 401. Second mandrel; 402. Left chamber of the second piston; 403. Right chamber of the second piston; 404. Second pressure relief gap; 5. First hydraulic cylinder body; Damping assembly; 51, First piston rod; 52, First piston; 53, First baffle ring; 54, Guide seat; 55, Guide ring; 56, First limiting ring; 521, First return flow hole; 522, First pressure relief groove; 523, First annular flange; 541, First through hole; 542, Second through hole; 551, Notch; 6, Second hydraulic damping assembly; 61, Second piston rod; 62, Second piston; 63, Second baffle ring; 64, Second limiting ring; 621, Second return flow hole; 7, L-shaped seat; 8, First spring; 9, Second spring. Detailed Implementation

[0031] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0034] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0036] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0037] See Figures 1 to 11 This utility model provides a double hydraulic cylinder type hydraulic spring hinge, including a housing 1, a camshaft 2 passing through the housing 1, and a main hydraulic cylinder 3 that can be slidably installed in the housing 1. In use, the housing 1 is fixed on the outer door leaf, and the camshaft 2 is fixed to the ground by the base. When the door leaf is rotated, the housing 1 and the main hydraulic cylinder 3 can rotate around the camshaft 2. During the rotation, the camshaft 2 can push the main hydraulic cylinder 3 to slide inside the housing 1.

[0038] See Figures 1 to 3 The dual-cylinder hydraulic spring hinge also includes an auxiliary hydraulic cylinder 4 that can be slidably installed within the housing 1. The auxiliary hydraulic cylinder 4 and the main hydraulic cylinder 3 are respectively arranged on both sides of the camshaft 2. When the door is closed, the main hydraulic cylinder 3 is positioned at the closest point to the rotation center of the camshaft 2, and the auxiliary hydraulic cylinder 4 is positioned at the farthest point to the rotation center of the camshaft 2. The auxiliary hydraulic cylinder 4 is used to provide hydraulic cushioning when subjected to external forces in the same direction during the closing process.

[0039] See Figure 3The main hydraulic cylinder 3 is equipped with a first hydraulic damping component 5, and the auxiliary hydraulic cylinder 4 is equipped with a second hydraulic damping component 6. When the door is closed normally, the main hydraulic cylinder 3 moves from the farthest point of the rotation center of the camshaft 2 to the nearest point, and the first hydraulic damping component 5 produces a hydraulic damping effect. At the same time, the auxiliary hydraulic cylinder 4 moves from the nearest point of the camshaft 2 to the farthest point, and the second hydraulic damping component 6 produces a hydraulic damping effect. This structure adds an auxiliary hydraulic cylinder 4 and a second hydraulic damping component 6. During normal door closing, both the first hydraulic damping component 5 and the second hydraulic damping component 6 can produce hydraulic damping effects, resulting in better overall damping and a better door closing effect. When the door is subjected to an external force in the same direction during the closing process, the main hydraulic cylinder 3 is prone to disengage from the camshaft 2 and lose its hydraulic damping effect. However, since the auxiliary hydraulic cylinder 4 moves from the closest point to the farthest point of the camshaft 2, it can always be in contact with the camshaft 2. Under the hydraulic damping effect generated by the second hydraulic damping component 6, the door can be buffered to prevent accidental damage to the door and ensure the performance.

[0040] In some embodiments, such as Figures 4 to 6 As shown, a cam portion 201 is provided on the camshaft 2, located in the middle of the camshaft 2. A groove 202 is formed on one side of the cam portion 201, and a first push head 301 adapted to the groove 202 is provided at the end of the main hydraulic cylinder 3. First cam walls 203 are symmetrically and spaced apart on the outer wall of the cam portion 201, and a second cam wall 204 is recessed between the two first cam walls 203. A second push head 401 is provided on the auxiliary hydraulic cylinder 4, which abuts against the second cam wall 204. The first cam walls 203 are used to push the main hydraulic cylinder 3 to slide, and the second cam wall 204 is used to push the auxiliary hydraulic cylinder 4 to slide. This structure, by providing the first cam wall 203 and the second cam wall 204, ensures that the auxiliary hydraulic cylinder 4 and the main hydraulic cylinder 3 can achieve their respective functions without interfering with each other.

[0041] In some embodiments, such as Figures 7 to 9 As shown, the first hydraulic damping assembly 5 includes a first piston rod 51, a first piston 52, and a first baffle ring 53. One end of the first piston rod 51 is fixedly connected to the housing 1, and the other end of the first piston rod 51 is inserted into the main hydraulic cylinder 3 and fixed with the first piston 52. The first piston 52 is placed inside the main hydraulic cylinder 3 and divides the inner cavity of the main hydraulic cylinder 3 into a left chamber 302 and a right chamber 303. A first pressure relief gap 304 is formed between the first piston 52 and the main hydraulic cylinder 3, and the left chamber 302 can be connected to the right chamber 303 through the first pressure relief gap 304. The first baffle ring 53 is slidably mounted on the first piston 52 and is used to open and close the first pressure relief gap 304. A first return flow hole 521 is provided inside the first piston 52, and the right chamber 303 can be connected to the left chamber 302 through the first return flow hole 521.

[0042] In some embodiments, such as Figure 8 and Figure 9 As shown, the first hydraulic damping assembly 5 also includes a guide seat 54 placed inside the left cavity 302 of the first piston. The guide seat 54 is mounted on the first piston rod 51 and abuts against the first piston 52. A first through hole 541 is symmetrically arranged inside the guide seat 54, and a second through hole 542 is symmetrically arranged at the end of the guide seat 54 facing the first piston 52. The left cavity 302 of the first piston is connected to the first pressure relief gap 304 through the first through hole 541 and the second through hole 542 in sequence. A guide ring 55 is sleeved on the guide seat 54, and a notch 551 is opened on the guide ring 55. This structure, through the cooperation of the guide seat 54 and the guide ring 55, can guide the main hydraulic cylinder 3, reduce friction and wear, and extend service life.

[0043] In some embodiments, such as Figures 7 to 9 As shown, the first piston 52 is provided with a plurality of first pressure relief grooves 522 at equal intervals in an annular shape, and the first pressure relief gap 304 is connected to the right cavity 303 of the first piston through the first pressure relief grooves 522; one end of the first piston 52 is provided with a first annular flange 523, and the first annular flange 523 and the main hydraulic cylinder 3 form the first pressure relief gap 304; the other end of the first piston 52 is fitted with a first limiting ring 56, and the first flow-blocking ring 53 can slide between the first annular flange 523 and the first limiting ring 56; when the first flow-blocking ring 53 abuts against the first annular flange 523, the first pressure relief gap 304 is closed; when the first flow-blocking ring 53 disengages from the first annular flange 523, the first pressure relief gap 304 is opened; a first spring 8 is installed between the main hydraulic cylinder 3 and the housing 1.

[0044] When the door is opened, the main hydraulic cylinder 3 gradually moves from the closest point to the farthest point of the camshaft 2's rotation center. The camshaft 2 pushes the main hydraulic cylinder 3 to move to the right, compressing the first spring 8. At this time, the first baffle ring 53 is pushed onto the first limit ring 56, and the first pressure relief gap 304 is opened. The hydraulic oil in the left chamber 302 of the first piston enters the right chamber 303 of the first piston through the first pressure relief gap 304. When the door is closed, under the spring force of the first spring 8, the main hydraulic cylinder 3 moves to the left. At this time, the first baffle ring 53 is pushed onto the first annular flange 523, and the first pressure relief gap 304 is closed. The hydraulic oil in the right chamber 303 of the first piston enters the left chamber 302 of the first piston through the first return flow hole 521. Because the diameter of the first return flow hole 521 is small, the main hydraulic cylinder 3 can slowly return to its original position, thereby producing a hydraulic damping effect.

[0045] In some embodiments, such as Figure 10 and Figure 11As shown, the structure and hydraulic principle of the second hydraulic damping assembly 6 are basically the same as those of the first hydraulic damping assembly 5, but the second hydraulic damping assembly 6 does not have the guide seat 54 and guide ring 55 components.

[0046] The second hydraulic damping assembly 6 includes a second piston rod 61, a second piston 62, and a second baffle ring 63. One end of the second piston rod 61 is fixedly connected to the housing 1, and the other end is inserted into the auxiliary hydraulic cylinder 4 and fixed with the second piston 62. The second piston 62 divides the inner cavity of the auxiliary hydraulic cylinder 4 into a second piston left cavity 402 and a second piston right cavity 403. A second pressure relief gap 404 is formed between the second piston 62 and the auxiliary hydraulic cylinder 4. The second baffle ring 63 is slidably mounted on the second piston 62 and is used to open and close the second pressure relief gap 404. A second return flow hole 621 is provided inside the second piston 62, and the second piston right cavity 403 is connected to the second piston left cavity 402 through the second return flow hole 621. A second limiting ring 64 is fitted on the second piston 62 and is used to limit the second baffle ring 63. A second spring 9 is installed between the auxiliary hydraulic cylinder 4 and the housing 1.

[0047] When the door is opened, the auxiliary hydraulic cylinder 4 gradually moves from the farthest point of the camshaft 2's rotation center to the closest point, and moves to the right, causing the second spring 9 to return to its original position. At this time, the second baffle ring 63 is pushed onto the second limit ring 64, and the second pressure relief gap 404 is opened. The hydraulic oil in the left chamber 402 of the second piston enters the right chamber 403 of the second piston through the second pressure relief gap 404. When the door is closed, the auxiliary hydraulic cylinder 4 gradually moves from the closest point of the camshaft 2's rotation center to the farthest point, the second spring 9 is compressed, and the main hydraulic cylinder 3 moves to the left. At this time, the second baffle ring 63 is pushed onto the second annular flange of the second piston 62, and the second pressure relief gap 404 is closed. The hydraulic oil in the right chamber 403 of the second piston enters the left chamber 402 of the second piston through the second return flow hole 621. Because the diameter of the second return flow hole 621 is small, the auxiliary hydraulic cylinder 4 can slowly return to its original position, thereby producing a hydraulic damping effect.

[0048] In some embodiments, such as Figure 1 and Figure 2 As shown, a cylindrical groove 101 extends along the length of the housing 1. The auxiliary hydraulic cylinder 4 and the main hydraulic cylinder 3 are both placed in the cylindrical groove 101. L-shaped seats 7 for covering the cylindrical groove 101 are symmetrically installed at both ends of the housing 1. A camshaft hole 102 is provided in the housing 1, which is arranged perpendicular to the cylindrical groove 101. The camshaft 2 is placed in the camshaft hole 102.

[0049] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0050] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual hydraulic cylinder type hydraulic spring hinge comprising a housing (1), a camshaft (2) penetrating in the housing (1), and a main hydraulic cylinder body (3) which is slidably installed in the housing (1), characterized in that: It also includes an auxiliary hydraulic cylinder (4) that can be slidably installed in the housing (1). The auxiliary hydraulic cylinder (4) and the main hydraulic cylinder (3) are respectively arranged on both sides of the camshaft (2). The main hydraulic cylinder (3) is located at the closest point to the rotation center of the camshaft (2), and the auxiliary hydraulic cylinder (4) is located at the farthest point to the rotation center of the camshaft (2). The auxiliary hydraulic cylinder (4) is used to provide hydraulic buffer when subjected to an external force in the same direction during the closing process.

2. The dual ram hydraulic spring hinge of claim 1, wherein: The camshaft (2) is provided with a cam portion (201), and a groove (202) is formed on one side of the cam portion (201). The end of the main hydraulic cylinder (3) is provided with a first push head (301) that is adapted to the groove (202). The outer wall of the cam portion (201) is provided with first cam walls (203) symmetrically and spaced apart. A second cam wall (204) is formed recessed between the two first cam walls (203). The auxiliary hydraulic cylinder (4) is provided with a second push head (401) that abuts against the second cam wall (204). The first cam wall (203) is used to push the main hydraulic cylinder (3) to slide, and the second cam wall (204) is used to push the auxiliary hydraulic cylinder (4) to slide.

3. The dual ram hydraulic spring hinge of claim 1, wherein: The main hydraulic cylinder (3) is equipped with a first hydraulic damping component (5), and the auxiliary hydraulic cylinder (4) is equipped with a second hydraulic damping component (6). When the door is closed, the main hydraulic cylinder (3) moves from the farthest point of the rotation center of the camshaft (2) to the nearest point, and the first hydraulic damping component (5) produces a hydraulic damping effect. The auxiliary hydraulic cylinder (4) moves from the nearest point of the camshaft (2) to the farthest point, and the second hydraulic damping component (6) produces a hydraulic damping effect.

4. The dual ram hydraulic spring hinge of claim 3, wherein: The first hydraulic damping assembly (5) includes a first piston rod (51), a first piston (52), and a first baffle ring (53). One end of the first piston rod (51) is fixedly connected to the housing (1), and the other end is inserted into the main hydraulic cylinder (3) and fixed with the first piston (52). The first piston (52) divides the inner cavity of the main hydraulic cylinder (3) into a first piston left cavity (302) and a first piston right cavity (303). A first pressure relief gap (304) is formed between the first piston (52) and the main hydraulic cylinder (3). The first baffle ring (53) is slidably mounted on the first piston (52) and is used to open and close the first pressure relief gap (304). A first return flow hole (521) is provided in the first piston (52), and the first piston right cavity (303) is connected to the first piston left cavity (302) through the first return flow hole (521).

5. The dual ram hydraulic spring hinge of claim 4, wherein: The first hydraulic damping assembly (5) further includes a guide seat (54) placed in the left cavity (302) of the first piston. The guide seat (54) is mounted on the first piston rod (51) and abuts against the first piston (52). The guide seat (54) is symmetrically provided with a first through hole (541). The guide seat (54) is symmetrically provided with a second through hole (542) at one end facing the first piston (52). The left cavity (302) of the first piston communicates with the first pressure relief gap (304) in sequence through the first through hole (541) and the second through hole (542). A guide ring (55) is sleeved on the guide seat (54). The guide ring (55) has a notch (551).

6. The dual ram hydraulic spring hinge of claim 4, wherein: The first piston (52) is provided with a plurality of first pressure relief grooves (522) at equal intervals in an annular shape, and the first pressure relief gap (304) is connected to the right cavity (303) of the first piston through the first pressure relief grooves (522); one end of the first piston (52) is provided with a first annular flange (523), and the first annular flange (523) and the main hydraulic cylinder (3) form the first pressure relief gap (304); the other end of the first piston (52) is fitted with a first limiting ring (56), and the first flow-blocking ring (53) can slide between the first annular flange (523) and the first limiting ring (56).

7. The dual hydraulic cylinder type hydraulic spring hinge as described in claim 3, characterized in that: The second hydraulic damping assembly (6) includes a second piston rod (61), a second piston (62), and a second baffle ring (63). One end of the second piston rod (61) is fixedly connected to the housing (1), and the other end is inserted into the auxiliary hydraulic cylinder (4) and fixed with the second piston (62). The second piston (62) divides the inner cavity of the auxiliary hydraulic cylinder (4) into a second piston left cavity (402) and a second piston right cavity (403). A second pressure relief chamber is formed between the second piston (62) and the auxiliary hydraulic cylinder (4). The second piston (62) has a second pressure relief gap (404); a second flow-blocking ring (63) is slidably mounted on the second piston (62), and the second flow-blocking ring (63) is used to open and close the second pressure relief gap (404); a second return flow hole (621) is provided inside the second piston (62), and the right cavity (403) of the second piston is connected to the left cavity (402) of the second piston through the second return flow hole (621); a second limiting ring (64) is fitted on the second piston (62), and the second limiting ring (64) is used to limit the second flow-blocking ring (63).

8. The dual ram hydraulic spring hinge of claim 1, wherein: A cylindrical groove (101) is provided inside the housing (1) along its length direction. The auxiliary hydraulic cylinder (4) and the main hydraulic cylinder (3) are both placed inside the cylindrical groove (101). L-shaped seats (7) for covering the cylindrical groove (101) are symmetrically installed at both ends of the housing (1). A camshaft hole (102) is provided inside the housing (1) and arranged perpendicularly to the cylindrical groove (101). The camshaft (2) is placed inside the camshaft hole (102).

9. The dual ram hydraulic spring hinge of claim 1, wherein: The first spring (8) is installed between the main hydraulic cylinder body (3) and the shell (1), and the second spring (9) is installed between the auxiliary hydraulic cylinder body (4) and the shell (1).

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