Improved hidden damping hinge

Abstract

The utility model relates to an improved hidden type damping hinge which comprises a first connecting seat, a second connecting seat, a hinge arm assembly and a damping oil cylinder, hinged supports are hinged to the two sides of one end of the hinge arm assembly respectively, the first connecting seat is provided with a first concave cavity, the two hinged supports are arranged in the first concave cavity, and the other end of the hinge arm assembly is hinged to the damping oil cylinder. The two ends of the damping oil cylinder are provided with cylinder bases respectively, the other end of the hinge arm assembly is hinged to the two cylinder bases, the second connecting base is provided with a second concave cavity corresponding to the damping oil cylinder, the damping oil cylinder is connected into the second concave cavity through the two cylinder bases, and the two hinge bases are fixedly connected through a first linkage piece. The ends of the first linkage pieces are connected to the two adjacent end faces of the hinged supports in a fastened mode. An arc-shaped concave surface is arranged on one side, close to the hinged axis of the hinged support or the cylinder base, of the upper surface of the hinged arm assembly; the two hinged supports of the hidden damping hinge are linked through the first linkage piece, adjustment is more convenient, and relative axial displacement between the hinged supports and the hinge pin of the hinge arm assembly is prevented.

Description

Technical Field

[0001] The utility model relates to the field of concealed hinges, in particular to an improved concealed damping hinge. Background Art

[0002] The current concealed damping hinge mainly includes a first connecting seat, a second connecting seat, a hinge arm assembly and a damping cylinder. The hinge arm assembly is hinged on both sides of one end thereof. The first connecting seat is provided with a first concave cavity corresponding to one end of the hinge arm assembly. Two hinge seats are arranged in the first concave cavity and are adjustably connected to the first connecting seat. The other end of the hinge arm assembly is also hinged to two cylinder seats on both sides. The damping cylinder is connected between the two cylinder seats, and the second connecting seat is provided with a second concave cavity corresponding to the damping cylinder. The damping cylinder is connected to the second concave cavity through the two cylinder seats. An adjusting seat is provided on the outer side of the hinge seat. The adjusting seat is connected to the first connecting seat through a locking screw. An elongated hole is provided on the adjusting seat, and the locking screw passes through the elongated hole.

[0003] When adjusting the hinge seat, to adjust one hinge seat, it is necessary to link the other hinge seat through the hinge arm assembly; when the locking screw on the passive hinge seat is not loose enough, it is easy to cause relative axial displacement of the hinge seat and the pin shaft of the hinge arm assembly, and the two hinge seats cannot achieve the same direction and synchronous movement adjustment; eventually, the hinge arm assembly can swing back and forth between the two hinge seats. Utility Model Content

[0004] The utility model aims to provide a concealed damping hinge which has a simple and reasonable structure, is easy to install and has a stable structure.

[0005] An improved concealed damping hinge comprises a first connecting seat, a second connecting seat, a hinge arm assembly and a damping oil cylinder. The hinge arm assembly is hinged with hinge seats on both sides at one end thereof. The first connecting seat is provided with a first concave cavity corresponding to one end of the hinge arm assembly. Two hinge seats are arranged in the first concave cavity and are adjustably connected to the first connecting seat. The other end of the hinge arm assembly is hinged with the damping oil cylinder. Cylinder seats are provided at both ends of the damping oil cylinder. The two sides of the other end of the hinge arm assembly are also hinged with the two cylinder seats respectively, and the second connecting seat is provided with a second concave cavity corresponding to the damping oil cylinder. The damping oil cylinder is connected in the second concave cavity through the two cylinder seats, and the two hinge seats are connected and fixed by a first linkage sheet. In addition, an arc-shaped concave surface is provided on the upper surface of the hinge arm assembly close to the hinge axis with the hinge seat or the cylinder seat.

[0006] The purpose of the utility model can also be solved by the following technical measures:

[0007] As a more specific solution, the bottom end surface of the hinge seat and the inner end surface close to the cylinder seat are provided with fastening holes; the first linkage piece is L-shaped, wherein the ends of the transverse part and the longitudinal part are provided with connecting holes corresponding to the fastening holes, and the fastening unit passes through the connecting holes and the fastening holes, so that the transverse part is fastened to the bottom end surface, and the longitudinal part is fastened to the inner end surface. Alternatively, the bottom end surface of the hinge seat is provided with fastening holes; the first linkage piece is flat, and the ends of the first linkage piece are provided with connecting holes corresponding to the fastening holes, and the fastening unit passes through the connecting holes and the fastening holes, so that the transverse part is fastened to the bottom end surface.

[0008] As a further solution, the two cylinder seats are connected and fixed via a second linkage plate.

[0009] As a further solution, the hinge arm assembly includes at least a first connecting rod and a second connecting rod, the first connecting rod includes two first connecting rods, the ends of the two first connecting rods are adjacently arranged with a first sleeve at intervals to form a U-shaped structure, and an arcuate concave surface is provided at the joint between the first connecting rod and the first sleeve; the second connecting rod is arranged between the two first connecting rods, and the middle parts of the first and second connecting rods are cross-hinged in an X shape through a pin shaft, one end of the second connecting rod is provided with a second sleeve and forms a T-shaped structure with the second sleeve, and an arcuate concave surface is provided at the joint between the second connecting rod and the second sleeve.

[0010] As a further solution, the hinge arm assembly also includes a third connecting rod with a concave structure, one end of the third connecting rod is hinged to the hinge seat through a pin on the left and right sides, and the other end is hinged to the other end of the second connecting rod through a pin on the left and right sides; one end of the second connecting rod is hinged to the cylinder seat through a pin inserted in the second sleeve; one end of the first connecting rod is hinged to the hinge seat through a pin inserted in the first sleeve, and the damping cylinder is connected to a third sleeve placed between the two first connecting rods, and the other end of the first connecting rod is hinged to the third sleeve through a pin.

[0011] As a further solution, a detachable pre-installed expansion component is further arranged between the hinge seat and the adjacent cylinder seat; the pre-installed expansion component includes an inserting and pulling part, the surface contour of the inserting and pulling part is an arc structure, and the bottom surface of the inserting and pulling part is provided with an expansion tongue, which extends in the direction of the hinge seat and the cylinder seat, and one end of the expansion tongue is abutted against the cylinder seat, and the other end is clamped in the gap between the first connecting seat and the hinge seat.

[0012] As a further solution, guide grooves are provided at both ends of the first concave cavity, and connecting holes are provided at the bottom of the guide grooves. A first adjustment seat is extended from the outer side of the hinge seat to form a linear sliding fit with the guide grooves. A strip through hole is provided on the first adjustment seat corresponding to the connecting hole, and the first adjustment seat is connected to the first connecting seat by passing a locking screw through the strip through hole and the connecting hole.

[0013] As a further solution, both ends of the second cavity are provided with a first support and a second support of different heights, and the outer side of the cylinder seat is extended with a second adjustment seat that matches the first and second support in height, and the second adjustment seat is rotatably riveted with a lifting adjustment screw, which is threadedly connected to the second support, and the second adjustment seat is also threadedly connected with a fixing screw, which passes through the second adjustment seat and abuts against the first support.

[0014] As a further solution, the damping cylinder includes a cylinder barrel, a rotating shaft assembly, a piston, an energy storage spring and a sealing plug. The rotating shaft assembly and the cylinder barrel are relatively rotatable, the piston is axially slidingly arranged in the cylinder barrel and spirally cooperates with the rotating shaft assembly, one end of the rotating shaft assembly is provided with a through hole leading to the interior of the cylinder barrel, a push rod is inserted in the through hole, the energy storage spring is arranged in the cylinder barrel and crimped between the piston and the sealing plug, the interior of the cylinder barrel is also filled with hydraulic oil, and its interior is sealed and separated from the outside; the damping cylinder is horizontally arranged in the second connecting seat, and is respectively connected to the two cylinder seats through the outer ends of the rotating shaft assembly.

[0015] As a further solution, the rotating shaft assembly includes a first rotating shaft and a second rotating shaft, the inner end of the first rotating shaft is axially provided with a first guide groove, the piston is inserted into the first guide groove and spirally matched with the first rotating shaft, the outer end of the first rotating shaft is provided with a first shaft head, the first shaft head is connected to one of the cylinder seats, the side wall of the first shaft head is provided with an opening, the two ends of the through hole lead to the first guide groove and the opening respectively, the inner end of the second rotating shaft is axially provided with a second guide groove, the second guide groove is axially provided with a sealing plug, the outer end of the second rotating shaft is provided with a second shaft head, the sealing plug is crimped between the energy storage spring and the inner end of the second guide groove, the cylinder seat corresponding to the first shaft head is provided with a first shaft hole matched with the first shaft head, the top surface of the cylinder seat is provided with a screw hole connected with the first shaft hole, a force adjusting screw is provided in the screw hole, and the screw hole passes through the screw hole and extends into the opening; the inner end of the force adjusting screw matches the outer end conical surface of the push rod.

[0016] As a further solution, the outer circumference of the piston is provided with an annular groove, a spiral groove and a guide block in sequence. The annular groove is located at one end close to the first rotating shaft, and a sealing ring is provided outside the annular groove. The piston is provided with a first oil hole running through both ends thereof, and a one-way flow limiting valve is provided in the first oil hole; a roller is provided in the first rotating shaft, and the roller is inserted into the spiral groove; an axial guide groove is provided on the inner wall of the cylinder, and the guide block is exposed outside the first rotating shaft and is linearly slidably matched with the axial guide groove.

[0017] The improved concealed damping hinge of the utility model has two hinge seats linked by a first linkage plate, which is more convenient to adjust and prevents relative axial displacement between the hinge seats and the pin shaft of the hinge arm assembly. The other two hinge seats are connected and fixed by the first linkage plate, which can also prevent relative lateral and longitudinal displacement between the two hinge seats. In addition, an arc-shaped concave surface is arranged on the upper surface of the hinge arm assembly, which can disperse or transfer the stress borne by the hinge arm assembly during use, reduce the risk of deformation and breakage of the hinge arm assembly, and increase the service life of the hinge arm assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the exploded structure of a hidden damping hinge embodiment.

[0019] Figure 2 It is a schematic diagram of the exploded structure of the first linkage piece in the utility model.

[0020] Figure 3 This is a schematic diagram of the disassembled structure of the hinge arm assembly and the pre-installed propping parts in the utility model.

[0021] Figure 4 This is a schematic diagram of the first connecting rod structure in the utility model.

[0022] Figure 5 This is a schematic diagram of the second connecting rod structure in the utility model.

[0023] Figure 6 It is a schematic diagram of the structure of the pre-installed propping member in the utility model.

[0024] Figure 7 It is a schematic diagram of the exploded structure of the first connecting seat and the hinge seat in the utility model.

[0025] Figure 8 It is a schematic diagram of the exploded structure of the second connecting seat and the cylinder seat in the utility model.

[0026] Fig. 9 It is a schematic diagram of the exploded structure of the damping oil cylinder in the utility model.

[0027] Fig.10 It is a schematic diagram of the cross-sectional structure of the damping oil cylinder in the utility model.

[0028] Fig.11 This is a structural schematic diagram of Example 2 of the present utility model.

[0029] Fig.12 This is a schematic diagram of the exploded structure of the hinge arm assembly in the utility model.

[0030] Fig.13 It is a schematic diagram of the cross-sectional structure of the second damping cylinder in the utility model.

[0031] Fig.14 It is a schematic diagram of the exploded structure of Embodiment 3 of the concealed damping hinge in the utility model.

[0032] Fig.15 for Fig.14 Schematic diagram of the structure from another angle.

[0033] Fig.16 It is a side view structural schematic diagram of the concealed damping hinge in the utility model.

[0034] Fig.17 for Fig.16 AA cross-sectional structure schematic diagram.

[0035] Fig.18 It is a structural schematic diagram of a fourth embodiment of a concealed damping hinge in the utility model. DETAILED DESCRIPTION

[0036] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Example

[0037] like Figures 1 to 8 As shown, the improved concealed damping hinge comprises a first connecting seat 1, a second connecting seat 2, a hinge arm assembly 3 and a damping cylinder 8, wherein hinge seats 4 are respectively hinged on both sides of one end of the hinge arm assembly 3, the first connecting seat 1 is provided with a first concave cavity 101 corresponding to one end of the hinge arm assembly 3, two hinge seats 4 are arranged in the first concave cavity 101 and are adjustably connected to the first connecting seat 1, the other end of the hinge arm assembly 3 is hinged to the damping cylinder 8, cylinder seats 5 are respectively provided at both ends of the damping cylinder 8, the two sides of the other end of the hinge arm assembly 3 are also respectively hinged to the two cylinder seats 5, and the second connecting seat 2 is provided with a second concave cavity 201 corresponding to the damping cylinder 8, the damping cylinder 8 is connected in the second concave cavity 201 through the two cylinder seats 5, and the two hinge seats 4 are connected and fixed by a first linkage sheet 6; and an arc-shaped concave surface 7 is provided on the upper surface of the hinge arm assembly 3 close to the hinge axis with the hinge seat 4 or the cylinder seat 5.

[0038] The two hinge seats 4 of this concealed damping hinge are linked by a first linkage plate 6, which makes adjustment more convenient and prevents relative axial displacement between the hinge seats 4 and the pin shafts of the hinge arm assembly 3.

[0039] A fastening hole 401 is provided on the bottom end surface of the hinge seat 4 and the inner end surface close to the cylinder seat 5; the first linkage piece 6 is L-shaped, wherein the ends of the transverse portion 61 and the longitudinal portion 62 are provided with connecting holes 601 corresponding to the fastening holes 401, and a fastening unit 9 such as a screw passes through the connecting holes 601 and the fastening holes 401, so that the transverse portion 61 is fastened to the bottom end surface, and the longitudinal portion 62 is fastened to the inner end surface.

[0040] The two hinge seats 4 are connected and fixed by the transverse portion 61 and the longitudinal portion 62 of the first linkage piece 6, which can also prevent the two hinge seats 4 from relative transverse and longitudinal displacement; the first linkage piece 6 is an integrated structure, which is simple to produce, low in cost, and can improve assembly efficiency.

[0041] The hinge arm assembly 3 includes at least a first connecting rod 31 and a second connecting rod 32. The first connecting rod 31 includes two first connecting rods 31. The ends of the two first connecting rods 31 are spaced apart and arranged adjacent to each other through a first shaft sleeve 311 to form a U-shaped structure, and an arc-shaped concave surface 7 is provided at the joint between the first connecting rod 31 and the first shaft sleeve 311; the second connecting rod 32 is arranged between the two first connecting rods 31, and the middle parts of the first and second connecting rods 32 are cross-hinged in an X shape through a pin shaft. One end of the second connecting rod 32 is provided with a second shaft sleeve 321 and forms a T-shaped structure with the second shaft sleeve 321. The joint between the second connecting rod 32 and the second shaft sleeve 321 is provided with an arc-shaped concave surface 7.

[0042] The arc-shaped concave surface 7 is provided on the upper surface of the first connecting rod 31 and the second connecting rod 32, which can disperse or transfer the stress borne by the hinge arm assembly during use, reduce the risk of deformation and fracture of the hinge arm assembly, and increase the service life of the hinge arm assembly.

[0043] The hinge arm assembly 3 also includes a third connecting rod 33 with a concave structure, one end of the third connecting rod 33 is hinged to the hinge seat 4 through a pin shaft on the left and right sides, and the other end is hinged to the other end of the second connecting rod 32 on the left and right sides through a pin shaft; one end of the second connecting rod 32 is hinged to the cylinder seat 5 through a pin shaft inserted in the second shaft sleeve 321; one end of the first connecting rod 31 is hinged to the hinge seat 4 through a pin shaft inserted in the first shaft sleeve 311, and a third shaft sleeve 34 placed between the two first connecting rods 31 is connected to the damping cylinder 8, and the other end of the first connecting rod 31 is hinged to the third shaft sleeve 34 through a pin shaft.

[0044] A detachable pre-installed stretching member 10 is also provided between the hinge seat 4 and the adjacent cylinder seat 5. When the damping hinge is not installed on the door or window, it is difficult to open the damping hinge by the force arm principle after the damping hinge is closed, which makes it difficult for workers to assemble. When the damping hinge leaves the factory, it is supported by the pre-installed stretching member 10 so that the damping hinge can remain in an open state.

[0045] The pre-installed expansion member 10 includes a plug-in portion 1001, and the surface profile of the plug-in portion 1001 is an arc structure; workers can install or remove the pre-installed expansion member 10 through the plug-in portion 1001, and the plug-in portion 1001 with the arc structure can prevent the plug-in portion 1001 from scratching the hands;

[0046] The bottom surface of the plug-in portion 1001 is provided with a spreading tongue 1002, which extends toward the hinge seat 4 and the cylinder seat 5, with one end of the spreading tongue 1002 resting on the cylinder seat 5 and the other end clamped in the gap A between the first connecting seat 1 and the hinge seat 4; since the hinge seat 4 can be adjusted relative to the first connecting seat 1, a movable gap A is left between the two, so the gap A can be used to clamp the spreading tongue 1002 to achieve a positioning and fixing effect.

[0047] Guide grooves 102 are provided at both ends of the first concave cavity 101, and a connecting hole 103 is provided at the bottom of the guide groove 102. A first adjustment seat 41 is extended from the outer side of the hinge seat 4 to form a linear sliding fit with the guide groove 102. The first adjustment seat 41 is provided with a strip through hole 411 corresponding to the connecting hole 103. The first adjustment seat 41 is connected to the first connecting seat 1 by a locking screw 11 passing through the strip through hole 411 and the connecting hole 103.

[0048] Both ends of the second concave cavity 201 are provided with a first support 202 and a second support 203 set at different heights. The outer side of the cylinder seat 5 is extended with a second adjustment seat 51 that matches the first support 202 and the second support 203 in height. The second adjustment seat 51 is rotatably riveted with a lifting adjustment screw 12, which is threadedly connected to the second support 203. The second adjustment seat 51 is also threadedly connected with a fixing screw 13, which passes through the second adjustment seat 51 and abuts against the first support 202.

[0049] like Fig. 9 and Fig.10 As shown, the damping cylinder 8 includes a cylinder barrel 81, a rotating shaft assembly, a piston 83, an energy storage spring 82 and a sealing plug 87. The rotating shaft assembly and the cylinder barrel 81 are relatively rotatable, the piston 83 is axially slidably arranged in the cylinder barrel 81 and spirally cooperates with the rotating shaft assembly, one end of the rotating shaft assembly is provided with a through hole leading to the inside of the cylinder barrel 81, and a push rod 88 is inserted in the through hole, the energy storage spring 82 is arranged in the cylinder barrel 81 and crimped between the piston 83 and the sealing plug 87, the cylinder barrel 81 is also filled with hydraulic oil, and its interior is sealed and separated from the outside; the damping cylinder 8 is horizontally arranged in the second connecting seat 2, and is respectively connected to the two cylinder seats 5 through the outer ends of the rotating shaft assembly.

[0050] The shaft assembly includes a first shaft 84 and a second shaft 89. The inner end of the first shaft 84 is axially provided with a first guide groove. The piston 83 is inserted into the first guide groove and spirally matched with the first shaft 84. The outer end of the first shaft 84 is provided with a first shaft head 843. The first shaft head 843 is connected to one of the cylinder seats 5. The side wall of the first shaft head 843 is provided with an opening 893. The two ends of the through hole lead to the first guide groove and the opening 893 respectively. The inner end of the second shaft 89 is axially provided with a second guide groove. The second guide groove is axially provided with a A sealing plug 87 is provided at the outer end of the second rotating shaft 89 with a second shaft head 891, and the sealing plug 87 is crimped between the energy storage spring 82 and the inner end of the second guide groove, and the cylinder seat 5 corresponding to the first shaft head 843 is provided with a first shaft hole 501 that cooperates with the first shaft head 843, and the top surface of the cylinder seat 5 is provided with a screw hole 502 that is connected to the first shaft hole 501, and a force adjusting screw 503 is provided in the screw hole 502, and extends into the opening 893 through the screw hole 502; the inner end of the force adjusting screw 503 cooperates with the outer end conical surface of the push rod 88.

[0051] The outer circumference of the piston 83 is provided with an annular groove, a spiral groove 831 and a guide block 832 in sequence. The annular groove is located at one end close to the first rotating shaft 84, and a sealing ring is provided outside the annular groove. The piston 83 is provided with a first oil hole running through both ends thereof, and a one-way flow limiting valve 833 is provided in the first oil hole; a roller 834 is provided in the first rotating shaft 84, and the roller 834 is inserted into the spiral groove 831; an axial guide groove 812 is provided on the inner wall of the cylinder 81, and the guide block 832 is exposed outside the first rotating shaft 84 and is linearly slidably matched with the axial guide groove 812.

[0052] The roller 834 is rotatably disposed on the fixed shaft 835 , and both ends of the fixed shaft 835 are fixedly connected to corresponding holes 842 on the first rotating shaft 84 .

[0053] The first shaft head 843 is provided with a through hole, the push rod 88 is spirally connected in the through hole, the inner end of the push rod 88 is provided with a valve needle 861, and the outer periphery of the end of the valve needle 861 close to the push rod 88 is provided with a necking section; the center of the piston 83 is provided with a second oil hole 836 that runs through both ends thereof, and the end of the piston 83' facing the energy storage spring 82 is provided with a cavity, the first oil hole and the second oil hole 836 are respectively connected to the cavity, the valve needle 861 is inserted into the second oil hole 836, and has a clearance fit with the second oil hole 836. A sealing ring is also provided on the outer periphery of the piston 83 of the damping oil cylinder 8, and the sealing ring is sealed and matched with the inner wall of the first guide groove of the first rotating shaft 84.

[0054] The first rotating shaft 84 is provided with a first shoulder on the periphery corresponding to the first shaft head 843, and a first annular arc groove is provided on the first shoulder. The first shaft head 843 is provided with a first sleeve 851 on the outer sleeve, and a second annular arc groove is provided on the first sleeve 851 facing the first annular arc groove. A plurality of first steel balls are provided between the first annular arc groove and the second annular arc groove. The first sleeve 851 is located in one end of the cylinder 81, and sealing rings are provided between the outer ring surface and the inner ring surface of the first sleeve 851 and the inner wall of the cylinder 81 and the outer periphery of the first shaft head 843 respectively; the outer end side wall of the first shaft head 843 is also provided with a cut surface, and is sleeved with the gear ring 77, and the outer periphery of the gear ring 77 is provided with teeth, wherein a cylinder seat 5 is provided with a first shaft hole 501, and the first shaft hole 501 is interference fit with the teeth on the outer periphery of the gear ring 77.

[0055] A first retaining spring 844 for blocking the first shaft sleeve 851 is further disposed outside the first shaft head 843 .

[0056] A sealing ring is provided between the second rotating shaft 89 and the inner wall of the cylinder 81 ; and a second shaft hole 504 matching with the second rotating shaft 89 is provided on the other cylinder seat 5 .

[0057] The top surfaces of both ends of the first connecting seat 1 and the second connecting seat 2 are provided with connecting ears 15 , and a cover plate 16 is provided on the connecting ears 15 .

[0058] Its working principle is as follows: Assuming that the first connecting seat 1 and the second connecting seat 2 are connected to the door body and the door frame respectively, when the door is opened, the hinge arm assembly drives the cylinder 81 to rotate relative to the shaft assembly, and the cylinder 81 drives the piston 83 to rotate at the same time, and the piston 83 and the first shaft 84 perform a lead screw motion, and the piston 83 moves upward and causes the energy storage spring 82 to be compressed. At the same time, during the rising process of the piston 83, the one-way flow limiting valve 833 opens (allowing a larger amount of oil to pass through) to reduce the resistance of the piston 83.

[0059] When closing the door, the energy storage spring 82 releases its pressure, pushes the piston 83 downward, and drives the cylinder 81 and the hinge arm assembly to rotate in the opposite direction. At this time, the one-way flow limiting valve 833 is closed (oil cannot pass or the amount of oil allowed to pass is small), and the hydraulic oil under the piston 83 can only pass slowly through the gap between the valve needle 861 and the second oil hole 836, which plays the role of slowly closing the door. When the second oil hole 836 of the piston 83 moves down to the necking position of the valve needle 861 (when the door body is close to closing), the gap between the second oil hole 836 and the valve needle 861 increases, and the oil passing speed increases, thereby achieving fast door closing. By rotating the top rod 88, the relative distance between the necking position of the valve needle 861 and the second oil hole 836 is changed, thereby changing the angle of fast door closing. The later the second oil hole 836 reaches the necking position (or does not pass the necking position), the slower the door closing speed, and even the whole process of slow and silent door closing can be achieved. Example

[0060] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that: Fig.11 and Fig.13 As shown, a second damping cylinder 14 is further provided in the first concave cavity, and both ends of the second damping cylinder 14 are connected to the hinge seat 4. Compared with the damping cylinder 8, the structure of the second damping cylinder 14 does not have a damping structure. The damping structure mainly refers to the push rod 88 and the valve needle 861, and the oil hole structure on the piston that cooperates with the valve needle 861; correspondingly, the hinge arm assembly 3 can omit the third connecting rod 33, and the second damping cylinder 14 is hinged to the other end of the second connecting rod through the fourth shaft sleeve 35.

[0061] The piston 83 of the second damping oil cylinder 14 has no sealing ring on its outer periphery, and is clearance-matched with the inner wall of the first guide groove of the first rotating shaft 84. The piston 83 of the second buffer shaft 7 is sleeve-shaped, with an oil through hole formed in the center (similar in function to the second oil through hole 836, but without the need to insert a valve needle), and the oil through hole can be provided with a narrowing portion.

[0062] Compared with the first embodiment, the second embodiment adopts a double buffer shaft. When the damping hinge is opened and closed, the double buffer shaft makes both sides of the hinge arm assembly 3 have a buffering effect, preventing the hinge arm assembly 3 from being broken due to a large impact force in an instant. In addition, the double buffer shaft is not affected by the size of the installation space, and can provide a larger spring force, so that when the damping hinge is used in conjunction with a heavy door, the damping door closing effect is better. Example

[0063] The structure and principle of the third embodiment are basically the same as those of the second embodiment, except that: Fig.14 and Fig.17 As shown, a fastening hole 401 is provided on the bottom end surface of the hinge seat 4; the first linkage piece 6 is in the shape of a flat plate, and a connecting through hole 601 is provided at the end of the first linkage piece 6 corresponding to the fastening hole 401, and the fastening unit 9 passes through the connecting through hole 601 and the fastening hole 401, so that the transverse portion 61 is fastened and fitted on the bottom end surface.

[0064] The two cylinder seats 5 are connected and fixed via a second linkage piece 6 ′. The structure of the second linkage piece 6 ′ may refer to the first linkage piece 6 .

[0065] There is no sealing ring on the periphery of the piston 83 of the second damping cylinder 14, that is, oil can flow between the periphery of the piston 83 and the first rotating shaft 84; the piston 83 is also provided with oil through holes running through both ends thereof, and a one-way valve 837 is provided in the oil through hole to limit the oil flow. Example

[0066] The fourth embodiment is different from the first embodiment in that: Fig.18As shown, a second damping cylinder 14 is further provided in the first concave cavity as in the second embodiment, and the structure and working principle of the damping cylinder 8 are the same as those in the first embodiment. The structure and working principle of the second damping cylinder 14 are basically the same as those of the damping cylinder 8, except that the direction of the spiral groove 831 in the damping cylinder 8 is exactly opposite to the direction of the spiral groove 831 of the second damping cylinder 14, so that when it is opened, the energy storage springs 82 of the two damping cylinders are compressed at the same time, and released at the same time when closed.

[0067] In this embodiment, the damping cylinder 8 and the second damping cylinder 14 both have an adjustable push rod 88 and valve needle 861 structure, as well as a piston push rod 810 structure, while in other embodiments, only the damping cylinder 8 or the second damping cylinder 14 has the piston push rod 810 structure.

[0068] The above is a preferred embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An improved concealed damping hinge, comprising a first connecting seat (1), a second connecting seat (2), a hinge arm assembly (3) and a damping oil cylinder (8), wherein one end of the hinge arm assembly (3) is hingedly connected to hinge seats (4) on both sides thereof, the first connecting seat (1) is provided with a first concave cavity (101) corresponding to one end of the hinge arm assembly (3), two hinge seats (4) are arranged in the first concave cavity (101) and are adjustably connected to the first connecting seat (1), the other end of the hinge arm assembly (3) is hingedly connected to the damping oil cylinder (8), both ends of the damping oil cylinder (8) are provided with cylinder seats (5), the other end of the hinge arm assembly (3) is also hingedly connected to the two cylinder seats (5) on both sides thereof, and the second connecting seat (2) is provided with a second concave cavity (201) corresponding to the damping oil cylinder (8), and the damping oil cylinder (8) is connected to the second concave cavity (201) through the two cylinder seats (5), characterized in that: The two hinge seats (4) are connected and fixed via a first linkage piece (6); and an arc-shaped concave surface (7) is provided on the upper surface of the hinge arm assembly (3) on the side close to the hinge axis with the hinge seat (4) or the cylinder seat (5).

2. The improved concealed damping hinge according to claim 1, characterized in that: The bottom end surface of the hinge seat (4) and the inner end surface close to the cylinder seat (5) are provided with fastening holes (401); the first linkage piece (6) is L-shaped, wherein the ends of the transverse portion (61) and the longitudinal portion (62) are provided with connecting holes (601) corresponding to the fastening holes (401), and the fastening unit (9) passes through the connecting holes (601) and the fastening holes (401), so that the transverse portion (61) is fastened to the bottom end surface and the longitudinal portion (62) is fastened to the inner end surface; Alternatively, a fastening hole (401) is provided on the bottom end surface of the hinge seat (4); the first linkage piece (6) is in the shape of a flat plate, and a connecting through hole (601) is provided on the end of the first linkage piece (6) corresponding to the fastening hole (401); a fastening unit (9) passes through the connecting through hole (601) and the fastening hole (401), so that the transverse portion (61) is fastened and fitted on the bottom end surface.

3. The improved concealed damping hinge according to claim 1, characterized in that: The two cylinder seats (5) are connected and fixed via a second linkage piece (6').

4. The improved concealed damping hinge according to claim 1 is characterized in that The hinge arm assembly (3) comprises at least a first connecting rod (31) and a second connecting rod (32); the first connecting rod (31) comprises two first connecting rods, the ends of the two first connecting rods (31) are arranged adjacent to each other via a first shaft sleeve (311) to form a U-shaped structure, and an arcuate concave surface (7) is provided at the joint between the first connecting rod (31) and the first shaft sleeve (311); the second connecting rod (32) is arranged between the two first connecting rods (31), and the middle parts of the first and second connecting rods (32) are cross-hinged in an X shape via a pin shaft, one end of the second connecting rod (32) is provided with a second shaft sleeve (321) and forms a T-shaped structure with the second shaft sleeve (321), and an arcuate concave surface (7) is provided at the joint between the second connecting rod (32) and the second shaft sleeve (321).

5. The improved concealed damping hinge according to claim 4 is characterized in that The hinge arm assembly (3) further comprises a third connecting rod (33) having a concave structure, wherein one end of the third connecting rod (33) is hinged to the hinge seat (4) via a pin shaft on both sides, and the other end of the third connecting rod (33) is hinged to the other end of the second connecting rod (32) via a pin shaft on both sides; one end of the second connecting rod (32) is hinged to the cylinder seat (5) via a pin shaft inserted in the second shaft sleeve (321); one end of the first connecting rod (31) is hinged to the hinge seat (4) via a pin shaft inserted in the first shaft sleeve (311); a third shaft sleeve (34) disposed between the two first connecting rods (31) is connected to the damping oil cylinder (8), and the other end of the first connecting rod (31) is hinged to the third shaft sleeve (34) via a pin shaft.

6. The improved concealed damping hinge according to claim 1, characterized in that A detachable pre-installed expansion member (10) is also provided between the hinge seat (4) and the adjacent cylinder seat (5); the pre-installed expansion member (10) comprises an insertion portion (1001), the surface profile of the insertion portion (1001) is an arc structure, and the bottom surface of the insertion portion (1001) is provided with an expansion tongue (1002), the expansion tongue (1002) is extended in the direction of the hinge seat (4) and the cylinder seat (5), and one end of the expansion tongue (1002) is abutted against the cylinder seat (5), and the other end is clamped in the gap (A) between the first connection seat (1) and the hinge seat (4).

7. The improved concealed damping hinge according to claim 1, characterized in that The first concave cavity (101) is provided with guide grooves (102) at both ends, and a connecting hole (103) is provided at the bottom of the guide groove (102). A first adjustment seat (41) is extended from the outer side of the hinge seat (4) to form a linear sliding fit with the guide groove (102). The first adjustment seat (41) is provided with a strip-shaped through hole (411) corresponding to the connecting hole (103). The first adjustment seat (41) is connected to the first connecting seat (1) by a locking screw (11) passing through the strip-shaped through hole (411) and the connecting hole (103).

8. The improved concealed damping hinge according to claim 1, characterized in that The second concave cavity (201) is provided with a first support platform (202) and a second support platform (203) at both ends thereof, and a second adjustment seat (51) is extended from the outer side of the cylinder seat (5) and matches the first support platform (202) and the second support platform (203) in height, and the second adjustment seat (51) is rotatably riveted with a lifting adjustment screw (12), which is threadedly connected to the second support platform (203), and a fixing screw (13) is also threadedly connected to the second adjustment seat (51), and the fixing screw (13) passes through the second adjustment seat (51) and abuts against the first support platform (202).

9. The improved concealed damping hinge according to claim 1, characterized in that The damping oil cylinder (8) comprises a cylinder barrel (81), a rotating shaft assembly, a piston (83), an energy storage spring (82) and a sealing plug (87). The rotating shaft assembly and the cylinder barrel (81) are relatively rotatably matched. The piston (83) is axially slidably arranged in the cylinder barrel (81) and spirally matched with the rotating shaft assembly. One end of the rotating shaft assembly is provided with a through hole leading to the inside of the cylinder barrel (81). A push rod (88) is inserted into the through hole. The energy storage spring (82) is arranged in the cylinder barrel (81) and is crimped between the piston (83) and the sealing plug (87). The inside of the cylinder barrel (81) is also filled with hydraulic oil, and its inside is sealed and isolated from the outside. The damping oil cylinder (8) is horizontally arranged in the second connecting seat (2) and is respectively connected to the two cylinder seats (5) through the outer ends of the rotating shaft assembly.

10. The improved concealed damping hinge according to claim 9, characterized in that The rotating shaft assembly comprises a first rotating shaft (84) and a second rotating shaft (89), the inner end of the first rotating shaft (84) is axially provided with a first guide groove, the piston (83) is inserted into the first guide groove and spirally matched therewith, the outer end of the first rotating shaft (84) is provided with a first shaft head (843), the first shaft head (843) is connected to one of the cylinder seats (5), the side wall of the first shaft head (843) is provided with an opening (893), the two ends of the through hole lead to the first guide groove and the opening (893) respectively, the inner end of the second rotating shaft (89) is axially provided with a second guide groove, and a sealing plug (893) is axially provided in the second guide groove. 7), a second shaft head (891) is provided at the outer end of the second rotating shaft (89), a sealing plug (87) is crimped between the energy storage spring (82) and the inner end of the second guide groove, a cylinder seat (5) corresponding to the first shaft head (843) is provided with a first shaft hole (501) matched with the first shaft head (843), a screw hole (502) connected with the first shaft hole (501) is provided on the top surface of the cylinder seat (5), a force adjusting screw (503) is provided in the screw hole (502), and passes through the screw hole (502) and extends into the opening (893); the inner end of the force adjusting screw (503) is matched with the outer end conical surface of the push rod (88).

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