TWI694205B - Two-way opening and closing hydraulic buffer hinge - Google Patents

Abstract

The invention belongs to a bidirectional opening and closing hydraulic buffer hinge, which includes a first hinge body, a second hinge body, and a mandrel device. Both ends of the mandrel device are respectively connected to the first hinge body and the second hinge body. The characteristic is that the mandrel device includes a mandrel tube body, a first sealed connector, a second sealed connector, a movable piston cam, a limiting cylinder sleeve, a rotating connecting shaft, a spring, a limiting pin, and the spring is sleeved on the rotating connecting shaft , The movable piston cam is movably connected to the rotating connecting shaft, the limit cylinder sleeve is sleeved on the first sealing connection piece, the movable piston cam is movably embedded in the limit cylinder sleeve, and the limit pins are respectively inserted in the movable piston cam and the limit On the cylinder sleeve, the mandrel tube body is sleeved on the inner end of the first sealed connector, the second sealed connector is sealingly connected to the mandrel tube body, and the inner hole of the mandrel tube body forms a sealed oil cavity. The invention has the advantages of scientific and reasonable structural design, high reliability, long service life and low noise.

Description

Two-way opening and closing hydraulic buffer hinge

The invention belongs to the field of door and window accessories, in particular to a bidirectional opening and closing hydraulic buffer hinge.

At present, many hinges have a buffer function. Among them, most of the existing buffers are composed of the first hinge body, the second hinge body, the connecting shaft, the movable block, the spring, the positioning sleeve, the outer sleeve, and the limit pin. The positioning sleeve will be provided with a limit element Function limit pilot hole. During assembly, the spring is set on the connecting shaft, the movable block is movably connected to the end of the connecting shaft, and the two ends of the spring are respectively elastically acting on the connecting shaft and the movable block, and then the movable block is extended into the positioning sleeve, and Put the limit pin on the guide hole of the limit element and the movable block at the same time, then fit the outer sleeve on the connecting shaft, the movable block, the spring, and the positioning sleeve, and then put the two ends of the outer sleeve on the first On the hinge body and the second hinge body, the end of the connecting shaft is connected to the first hinge body, and the positioning sleeve is also connected to the second hinge body. In this way, when the first hinge body and the second hinge body rotate and rotate with each other, the movable block rotates relative to the positioning sleeve, and the limit element pin slides in the limit element guide hole. Due to the elasticity of the spring on the movable block, in the absence of external force, the spring through the spring will push the limiter pin to slide in the limiter guide hole, and then through the reverse force, the connecting shaft can be realized Rotating, so that the first hinge body and the second hinge body can rotate relative to each other, and then the door can be automatically closed Effect. In this type of buffer hinge, the door is automatically closed by the elastic force of the spring alone. However, under long-term use, the elastic force of the spring is prone to failure, which will cause the service life of the hinge to be reduced. Moreover, during the rotation of such activities, large noises are likely to occur, which greatly affects people's lives. Although there are currently hinges with hydraulic oil, due to the defects of the existing hinge structure design, hydraulic oil is prone to turbulence and disturbance during the process, which greatly affects the stability of the hinge buffer. It cannot satisfy people's normal use.

The purpose of the present invention is to solve the above problems and deficiencies, and to provide a two-way opening and closing hydraulic buffer hinge, the two-way opening and closing hydraulic buffer hinge has two opening and closing directions, and when opening a certain angle, the door leaf can be automatically positioned at a certain angle When the door leaf is closed to a certain angle, it can automatically close the door leaf, and can adjust the hinge operating strength, applicability strength, flexible and convenient adjustment according to actual needs; in addition, it also has a scientific, reasonable and reliable structural design Durability, long service life, minimal operating noise and other advantages.

The technical solution of the present invention is realized as follows: A bidirectional opening and closing hydraulic buffer hinge includes a first hinge body, a second hinge body, and a mandrel device. The first hinge body and the second hinge body pass through the core The shaft device is assembled and connected together, which is characterized in that the mandrel device includes a mandrel tube body, a first sealed connector, a second sealed connector, a movable piston cam, a limiting cylinder sleeve, a rotating connecting shaft, a spring, a limiting pin, One-way valve, wherein the outer end of the first sealing connector is provided with a threaded adjustment hole, an adjustment screw plug is provided in the threaded adjustment hole, and two sides of the hole wall of the threaded adjustment hole are provided with outwardly penetrating An oil hole and an oil inlet hole, wherein the oil return hole is arranged through the outer side wall of the first seal connector, the oil inlet hole is arranged through the inner end face of the first seal connector, and the first seal connector There is also a fixed cam part on the inner end face; the movable piston cam is provided with a movable cam part matching the fixed cam part, and a guide penetrating from one end to the other end is also provided on the movable piston cam Oil hole; the positioning cylinder sleeve is provided with a positioning guide hole that penetrates from one end to the other end, and a limiting element guide hole in the shape of a letter "V" is also provided on the surface of the limiting element cylinder sleeve. The limit element guide hole and the positioning guide hole are arranged in a penetrating communication, and a guide groove provided along the length of the limit cylinder sleeve is also provided on the surface of the limit cylinder sleeve; the limit cylinder sleeve and the first sealing connector are fixed together , And the guide groove on the limit cylinder liner and the oil return hole of the first sealing connector are connected to form an oil return channel; the movable piston cam is set in the positioning guide hole of the limit element cylinder liner, and is active The movable cam part on the piston cam is engaged with the fixed cam part of the first sealing connector, and a cavity hole for accommodating and installing the check valve is also provided between the movable cam part and the fixed cam part. It is installed in the cavity hole; there is also a limit pin arranged horizontally interposed between the limit cylinder sleeve and the movable piston cam, and one end of the limit pin is placed in the limit element guide hole to make the movable piston cam follow the limit The bit guide hole moves axially; the movable piston cam is fitted with one end of the rotating connecting shaft, and the spring is fitted between the movable piston cam and the rotating connecting shaft, thereby assembling to constitute the first mandrel element; The first mandrel element is sleeved in one end of the mandrel tube body, and the first sealing connector is placed at the one end nozzle of the mandrel tube body to form a sealing seal on the one end nozzle of the mandrel tube body End effect; the second sealing connector is connected to the other end of the rotating connecting shaft, and the second sealing connector is placed at the other end of the mandrel tube body to embed at the other end of the mandrel tube body One end of the orifice forms a sealing end effect, thereby forming a sealed oil cavity closed at both ends in the mandrel tube body.

Further, in order to adjust the tension of the spring, the rotary connecting shaft is also provided with a first waist-shaped hole, a spring pressure pin is inserted in the first waist-shaped hole, and the other end face of the rotary connecting shaft There is a threaded hole penetrating from the end surface to the first waist-shaped hole, and the threaded hole is installed with Adjust the screw and make the inner end of the adjusting screw against the middle of the spring pressure pin. The spring sleeve is placed between the spring pressure pin and the movable piston cam.

Furthermore, in order to connect the movable piston cam and the rotary connecting shaft simply and reliably, the movable piston cam is also provided with a sleeve hole, which is sleeved with the rotary connecting shaft. The outer surface is also provided with a second waist-shaped hole penetrating through the sleeve hole, and the second waist-shaped hole is also provided with a connecting movable pin traversing the rotating connecting shaft, so that the movable piston cam and the rotating connecting shaft are assembled and connected together.

Beneficial effect of the present invention: In the design of the present invention, since one end of the mandrel tube body is sleeved on the inner end of the first sealed connector, and one end of the second sealed connector is embedded in the mandrel tube body After the second sealing connector in one end is embedded in the mandrel tube body, the inner hole of the mandrel tube body can form a sealed oil cavity. The one end of the rotating connecting shaft, the movable piston cam, the spring, and the limit cylinder sleeve are all located in the oil cavity, which can play a role in shielding and protecting these structures, and can reduce the generation of noise and reduce the amount of wear of each component. This helps to increase the service life of the hinge. During the activity of the movable piston cam, the space between the movable piston cam and the fixed cam portion can be expanded or reduced. Since the first sealing connector is provided with a screw adjustment hole, an oil return hole and an oil inlet hole, after the assembly is completed, an oil inlet hole, a screw adjustment hole, an oil return hole and a diversion groove can be formed on the hinge , Oil cavity, oil guide hole constitute the oil circulation channel. Because the one-way valve is provided on the oil guide hole, the oil passage circulation channel can only achieve one-way flow, so that during the movement of the movable piston cam, the hydraulic oil can be pushed to flow in one direction along the oil passage circulation channel. Since the adjusting screw plug is provided in the screw adjusting hole, the screw bite amount between the oil inlet hole and the oil return hole hole can be adjusted by turning the adjusting screw plug. When the bite amount is larger, the hydraulic oil passes The more the thread bite clearance, the greater the cushioning effect it achieves. The smaller the bite amount, the less the bite clearance of the thread through which the hydraulic oil passes, and the cushioning effect it achieves The less. In this way, the purpose of adjusting the buffering force can be achieved. Since the oil inlet hole and the oil return hole are located on the wall of the thread adjustment hole, this can make the hydraulic oil flow more smoothly along the nip gap of the thread, which can effectively avoid the situation of turbulent disturbance and help Improve the buffer performance of the hinge, which can fully meet people's needs. At the same time, because the limit cylinder sleeve is provided with a limit element guide hole in the shape of a letter "V", under the action of the elastic force of the spring, the limit pin can only stay in the middle of the limit element guide hole. The page can be opened and closed in both directions. In application, the door can be opened both outward and inward, and when the door leaf is opened to a certain angle, the door leaf can be automatically positioned at a certain angle; for example, when the door leaf is opened to about 45 degrees, The door leaf can be automatically opened and positioned at a 90-degree angle, or, when the door leaf is opened to an angle greater than 90 degrees, the door leaf can be automatically opened and positioned at a 180-degree angle. On the contrary, when the door leaf is closed to a certain angle, it can automatically close the upper door leaf. And in the process of closing the door leaf, it also has a buffering effect, which avoids the door leaf from hitting the door frame excessively, and has the effect of mute closing the door. Through the cooperation of the movable cam part and the fixed cam part of the movable piston cam, it can play a double limiting role together with the limiting element guide hole, which helps to improve the reliability of the hinge. The structural design of the two-way opening and closing hydraulic buffer hinge is very scientific and reasonable, which helps to improve the reliability of the hinge.

1: the first hinge body

2: second hinge body

3: Mandrel device

4: The first mandrel element

10: Set hole

20: cavity

21: locking screw

31: Mandrel tube body

32: The first sealed connector

33: Second sealed connector

34: Active piston cam

35: Limit cylinder liner

36: Rotating connecting shaft

37: Spring

38: Limit pin

101: Set tube

102: fixed plate

103: protective cover

120: locking hole

301: Oil return hole

302: Oil inlet

311: Oil chamber

321: Threaded adjustment hole

322: adjusting screw plug

323: Cam part

324: Spline part

331: Bearing

332: bearing seal sleeve

333: Spline shaft head

341: Active cam

342: oil guide hole

343: Check valve

344: Sleeve hole

345: Second waist hole

346: Activity pin

351: Positioning guide hole

352: Limit hole guide hole

353: diversion channel

361: The first waist-shaped hole

362: spring pressure pin

363: threaded hole

364: Adjusting screw

1 is a schematic view of the three-dimensional structure of the present invention; FIG. 2 is a schematic view of the split structure of the present invention; FIG. 3 is a schematic sectional view of the mandrel device of the present invention; FIG. 4 is a schematic view of the split structure of the mandrel device of the present invention ; Fig. 5 is a schematic sectional view of the first sealing connector in the present invention; Fig. 6 is a schematic sectional view of the movable piston cam in the present invention; Fig. 7 is a schematic structural view of the limit cylinder sleeve in the present invention; Fig. 8 is A schematic view of the cross-sectional structure of the rotating connecting shaft in the present invention.

As shown in FIGS. 1, 2 and 4, a bidirectional opening and closing hydraulic buffer hinge according to the present invention includes a first hinge body 1, a second hinge body 2, a mandrel device 3, and the first hinge The page body 1 and the second hinge body 2 are assembled and connected together by a mandrel device 3, characterized in that the mandrel device 3 includes a mandrel tube body 31, a first sealed connector 32, a second sealed connector 33, a movable The piston cam 34, the limit cylinder sleeve 35, the rotation connecting shaft 36, the spring 37, the limit pin 38, and the check valve 343.

Wherein, as shown in FIG. 5, the outer end of the first sealing connector 32 is provided with a screw adjustment hole 321, and an adjustment screw 322 is provided in the screw adjustment hole 321, and the two sides of the hole wall of the screw adjustment hole 321 respectively There are an oil return hole 301 and an oil inlet hole 302 which are arranged to penetrate outward, wherein the oil return hole 301 is arranged to penetrate to the outer side wall of the first sealed connector 32, and the oil inlet hole 302 is arranged to penetrate to the first sealed connector On the inner end face of the 32, a fixed cam portion 323 is further provided on the inner end face of the first sealing connector 32. The design of the oil return hole 301 and the oil inlet hole 302 here can adjust the screw plug 322 to realize the speed of the oil flow when the entire oil circuit is running, so as to adjust the oil pressure during the entire hinge operation process.

As shown in FIG. 6 and FIG. 4, the movable piston cam 34 is provided with a movable cam portion 341 adapted to the fixed cam portion 323, and the movable piston cam 34 is further provided with an end penetrating from one end to the other end导油孔342.

As shown in FIGS. 7 and 4, the limiting cylinder sleeve 35 is provided with a positioning guide hole 351 extending from one end to the other end, and a letter “V” is also provided on the surface of the limiting cylinder sleeve 35 The shape of the limiting element guide hole 352 is provided in communication with the positioning guide hole 351. On the surface of the limiting cylinder sleeve 35, a guide groove 353 is also provided along its length.

As shown in FIGS. 2 and 3, the limiting cylinder liner 35 and the first sealing connector 32 are fixed together, and the diversion groove 353 on the limiting cylinder liner 35 and the oil return of the first sealing connector 32 The holes 301 communicate with each other to form an oil return channel; the movable piston cam 34 is fitted in the positioning guide hole 351 of the limit cylinder sleeve 35, and the movable cam portion 341 on the movable piston cam 34 is fixed to the first sealing connector 32 The cam portion 323 is relatively engaged with each other, and a cavity hole 20 for accommodating and installing the one-way valve 343 is also provided between the movable cam portion 341 and the fixed cam portion 323, and the one-way valve 343 is installed in the cavity hole 20; There is also a limit pin 38 interposed horizontally between the position cylinder liner 35 and the movable piston cam 34, and one end of the limit pin 38 is placed in the limit element guide hole 352, so that the movable piston cam 34 follows the limit element The guide hole 352 performs axial movement. The movable piston cam 34 is fitted with one end of the rotating connecting shaft 36, and the spring 37 is fitted between the movable piston cam 34 and the rotating connecting shaft 36 to assemble and constitute the first mandrel element 4.

As shown in FIG. 3, the first mandrel element 4 is fitted in one end of the mandrel tube body 31, and the first sealing connector 32 is placed at one end of the mandrel tube body 31 to align the core One end of the shaft tube 31 forms a sealing end; the second sealing connector 33 is connected to the other end of the rotating connecting shaft 36, and the second sealing connector 33 is placed in the mandrel tube body At the other end nozzle of 31, a sealing end effect is formed on the other end nozzle of the mandrel tube body 31, thereby forming a sealed oil cavity 311 with both ends closed in the mandrel tube body 31.

In the design of the present invention, since one end of the mandrel tube body 31 is sleeved on the inner end of the first seal connector 32, and one end of the second seal connector 33 is embedded in the other end of the mandrel tube body 31 After the second sealing connector 33 is embedded in the mandrel tube body 31, the inner hole of the mandrel tube body 31 can form a sealed oil cavity 311. The one end of the rotating connecting shaft 36, the movable piston cam 34, the spring 37, and the limit cylinder sleeve 35 are all located in the oil chamber 311, which can play a role in shielding and protecting these structures, and can reduce the generation of noise and reduce the various The amount of component wear, which helps to increase the service life of the hinge. During the movement of the movable piston cam 34, the space between the movable piston cam 34 and the fixed cam portion 323 can be enlarged or reduced. Since the first sealing connector 32 is provided with a screw adjustment hole 321, an oil return hole 301, and an oil inlet hole 302, after the assembly is completed, an oil inlet hole 302, a screw adjustment hole 321, a return hole can be formed on the hinge The oil passage 301, the flow guide groove 353, the oil chamber 311, and the oil guide hole 342 constitute an oil passage circulation channel. Since the oil guide hole 342 is provided with a one-way valve 343, the oil passage circulation channel can only achieve one-way flow, so that during the activity of the movable piston cam 34, the hydraulic oil can be pushed along the oil passage circulation channel flow. Since the adjusting screw 322 is provided in the screw adjusting hole 321, by turning the adjusting screw 322, the amount of thread bite between the port of the oil inlet 302 and the port of the oil return hole 301 can be adjusted, when the bite amount is larger The more the thread bite clearance through which the hydraulic oil passes, the greater the cushioning effect it achieves. When the bite amount is smaller, the thread bite clearance through which the hydraulic oil passes is smaller, and the less cushioning effect it achieves. In this way, the purpose of adjusting the buffering force can be achieved. Because the inlet hole 302 and the oil return hole 301 are located on the wall of the thread adjustment hole 321, this can make the hydraulic oil flow more smoothly along the nip of the thread, which can effectively avoid the situation of turbulent disturbance , Help to improve the buffering performance of the hinge, which can fully meet people's needs. At the same time, since the limiting cylinder liner 35 is provided with a limiting element guide hole 352 in the shape of a letter "V", under the elastic force of the spring 37, the limiting pin 38 can only stay at the limit The bit guide hole 352 is central, so that the hinge can be opened and closed in two directions. In application, the door can be opened both outwards and inwards, and can be automatically closed. It also has a buffering effect during the closing process. By the cooperation of the movable cam portion 341 and the fixed cam portion 323 of the movable piston cam 34, it can play a dual limiting role together with the limiting element guide hole 352, which helps to improve the reliability of the hinge. The structural design of the two-way opening and closing hydraulic buffer hinge is very scientific and reasonable, which helps to improve the reliability of the hinge.

By keeping the movement path of the limit pin 38 on the movable piston cam 34 consistent with the hole pattern of the limit element guide hole 352, it can be avoided that the movable pin cam 34 and the fixed cam portion 323 rotate relative to each other, and the limit pin 38 is stuck. , Which helps to improve the reliability of the overall structure. In the actual manufacturing process, in order to enhance the sealing performance of the hinge, a sealing ring may be provided at the connection of some structures as required.

In order to adjust the tension of the spring 37, as shown in FIG. 8, FIG. 3, and FIG. 4, the rotary connecting shaft 36 is also provided with a first waist-shaped hole 361, in which the first waist-shaped hole 361 is inserted The spring pressure pin 362 is provided with a threaded hole 363 penetrating from the end surface to the first waist-shaped hole 361 at the other end surface of the rotary connecting shaft 36. The threaded hole 363 is provided with an adjusting screw 364 The inner end is pressed against the middle of the spring pressure pin 362, and the spring 37 is nested between the spring pressure pin 362 and the movable piston cam 34. During use, the spring pressure pin 362 can be pushed by turning the adjusting screw 364 to slide along the first waist hole 361, which can achieve the purpose of the spring pressure pin 362 changing the pressure acting on the spring 37, which can be changed The movement intensity of the movable piston cam 34 is to achieve the purpose of adjusting the buffering effect. The structural design is very simple and reliable. Through the design of the adjustment structure of the spring force of this part of the spring, the invention can not only be adjusted by oil pressure To adjust the hinge running strength, and the hinge running strength can also be adjusted by adjusting the tension of the spring 37, which has the function of double adjustment.

In order to connect the movable piston cam and the rotary connecting shaft simply and reliably, as shown in FIGS. 3 and 4, the movable piston cam 34 is also provided with a sleeve hole 344, which is connected to the rotary connecting shaft 36 Together, a second waist-shaped hole 345 penetrating through the sleeve hole 344 is also provided on the outer surface of the movable piston cam 34, and a connecting movable pin traversing the rotary connecting shaft 36 is also provided in the second waist-shaped hole 345 346, so that the movable piston cam 34 and the rotary connecting shaft 36 are assembled and connected together. Through such a structural design, it is helpful to improve the reliability of the connecting structure of the movable piston cam 34 and the rotary connecting shaft 36.

On the basis of the foregoing, in order to further optimize the structure of the second sealed connector, as shown in FIGS. 2 and 4, the second hinge body 2 is provided with a sleeve hole 10, and the second sealed connector 33 includes a bearing 331 , Bearing seal sleeve 332, spline shaft head 333, the bearing 331 is sleeved on the other end of the rotary connecting shaft 36, the bearing seal sleeve 332 is sealed sleeved on the bearing 331, and the bearing seal sleeve 332 is sealed and embedded in the mandrel tube In the body 31, the spline shaft head 333 is fitted on the rotating connecting shaft 36 outside the bearing seal sleeve 332, and the spline shaft head 333 is fitted into the fitting hole 10 of the second hinge body 2. The structural design of the second sealed connector 33 is very reliable. In the actual manufacturing process, the ball bearing and the cylindrical rolling bearing can be fitted on the rotating connecting shaft 36 at the same time, and then the bearing sealing sleeve 332 can be fitted on the ball bearing and the cylindrical rolling bearing at the same time.

On the basis of the foregoing, in order to further optimize the structure of the first hinge body and the second hinge body, as shown in FIGS. 1 and 2, the first hinge body 1 and the second hinge body 2 are respectively formed by a sleeve 101. A fixing plate 102 is formed. The fixing plate 102 is provided with a plurality of locking holes 120. The sides of the fixing plate 102 are connected to the outer surface of the sleeve 101. The two ends of the mandrel device 3 are respectively connected to the first hinge The sleeve tube 101 of the body 1 is in the sleeve tube 101 of the second hinge body 2. The structural design of the first hinge body 1 and the second hinge body 2 is very simple and reliable, which helps to improve the manufacturing efficiency of the hinge. In the actual manufacturing process, the locking hole 120 can be made as a countersunk hole.

On the basis of the foregoing, in order to further optimize the assembly structure of the first sealing connector and the first hinge body, as shown in FIGS. 2 and 5, the first hinge body 1 is provided with a sleeve hole 10, the first The sealing connector 32 has a cylindrical structure. The outer end of the first sealing connector 32 is provided with a spline portion 324. The spline portion 324 is inserted into the sleeve hole 10 of the first hinge body 1. Through such a structural design, it is helpful to improve the reliability of the assembly structure of the first sealing connector 32 and the first hinge body 1. In actual use, a protective cover 103 may be placed on the outer end opening of the sleeve hole 10 of the first hinge body 1 and the second hinge body 2 respectively, so as to shield and protect the internal structure.

As shown in FIGS. 1 and 2, the mandrel tube body 31 is fitted with a plane bearing 301, and the plane bearing 301 is located between the first hinge body 1 and the second hinge body 2 respectively. The arrangement of the planar bearing 301 can prevent the first hinge body 1 and the second hinge body 2 from rubbing against each other, and can effectively improve the smoothness of the rotation of the first hinge body 1 and the second hinge body 2.

On the basis of the foregoing, in order to further optimize the assembly structure of the second sealing connector and the second hinge body, as shown in FIGS. 1 and 2, the second hinge body 2 is provided with a lock on the second sealing connector 33 and the locking screw 21 on the rotation connecting shaft 36. The structural design can play an effective positioning role and help to improve the reliability of the hinge. In the actual design process, the locking screw 21 sequentially passes through the outer wall of the sleeve 101 and the spline shaft head 333 and is pressed tightly on the rotating connecting shaft 36.

1‧‧‧The first hinge

2‧‧‧The second hinge

10‧‧‧Set hole

21‧‧‧locking screw

31‧‧‧Mandrel body

32‧‧‧The first sealed connector

33‧‧‧Second sealed connector

35‧‧‧Limited cylinder liner

36‧‧‧Rotating connecting shaft

37‧‧‧Spring

101‧‧‧ Set tube

102‧‧‧Fixed board

103‧‧‧Protection cover

322‧‧‧Adjusting screw plug

331‧‧‧bearing

364‧‧‧Adjusting screw

Claims (8)

A hinge includes a first hinge body (1), a second hinge body (2), and a mandrel device (3). The first hinge body (1) and the second hinge body (2) pass through the core The shaft device (3) is assembled and connected together, characterized in that the mandrel device (3) includes a mandrel tube body (31), a first sealed connector (32), a second sealed connector (33), and a movable piston cam (34), limit cylinder liner (35), rotary connecting shaft (36), spring (37), limit pin (38), check valve (343), wherein the outer end of the first sealed connector (32) A screw adjusting hole (321) is opened at the end, and an adjusting screw plug (322) is provided in the screw adjusting hole (321), and the oil return of the screw adjusting hole (321) is provided on both sides of the hole wall A hole (301) and an oil inlet hole (302), wherein the oil return hole (301) is arranged through the outer side wall of the first sealing connector (32), and the oil inlet hole (302) is arranged through the first sealing connection A fixed cam portion (323) is further provided on the inner end surface of the first sealing connector (32) on the inner end surface of the member (32); the fixed cam portion (323) is provided on the movable piston cam (34) ) The movable cam part (341) with matching action is also provided with an oil guide hole (342) penetrating from one end to the other end of the movable piston cam (34); the limiting cylinder sleeve (35) is provided There is a positioning guide hole (351) penetrating from one end to the other end, and a limit element guide hole (352) in the shape of letter "V" is also provided on the surface of the limit cylinder sleeve (35). The bit guide hole (352) and the positioning guide hole (351) are arranged in communication with each other, and a guide groove (353) provided along the length of the limit cylinder sleeve (35) is also provided on the surface; The limiting cylinder liner (35) and the first sealing connector (32) are fitted together and fixed together, and the deflector groove (353) on the limiting cylinder liner (35) and the return of the first sealing connector (32) The oil holes (301) are relatively connected together to form an oil return channel; the movable piston cam (34) is sleeved in the positioning guide hole (351) of the limit cylinder liner (35), and the movable cam on the movable piston cam (34) The portion (341) is engaged with the fixed cam portion (323) of the first sealing connector (32), and a check valve (343) is provided between the movable cam portion (341) and the fixed cam portion (323) ) Accommodating the installed cavity hole (20), the one-way valve (343) is installed in the cavity hole (20); there is also a lateral insertion setting between the limit cylinder liner (35) and the movable piston cam (34) The limit pin (38) and one end of the limit pin (38) are placed in the limit element guide hole (352), so that the movable piston cam (34) moves axially along the limit element guide hole (352) The movable piston cam (34) is fitted with one end of the rotating connecting shaft (36), and the spring (37) is fitted between the movable piston cam (34) and the rotating connecting shaft (36) to assemble and constitute A first mandrel element (4); the first mandrel element (4) is sleeved in one end of the mandrel tube body (31), and the first sealing connector (32) is placed on the mandrel tube body (31) ) At one end of the nozzle to form a sealed end effect on the one end of the mandrel tube body (31); the second seal connector (33) is connected to the other end of the rotary connection shaft (36), And the second sealing connector (33) is placed at the other end of the mandrel tube body (31) to form a sealed end effect on the other end of the mandrel tube body (31) Thus, a sealed oil cavity (311) with both ends closed is formed in the mandrel tube body (31). The hinge according to claim 1, wherein the rotary connecting shaft (36) is further provided with a first waist-shaped hole (361), and a spring pressure pin (362) is inserted in the first waist-shaped hole (361) ), the other end face of the rotating connecting shaft (36) is provided with a threaded hole (363) penetrating from the end face to the first waist hole (361), and an adjusting screw (364) is installed in the threaded hole (363) And the inner end of the adjusting screw (364) is pressed against the middle of the spring pressure pin (362), and the spring (37) is sleeved between the spring pressure pin (362) and the movable piston cam (34). The hinge according to claim 1, wherein the movable piston cam (34) is further provided with a sleeve hole (344), and the sleeve hole (344) is sleeved together with the rotary connecting shaft (36), in The outer surface of the movable piston cam (34) is also provided with a second waist-shaped hole (345) penetrating through the sleeve hole (344), and the second waist-shaped hole (345) is also provided with a transverse rotation connecting shaft (36) ) Is connected to the movable pin (346), so that the movable piston cam (34) and the rotary connecting shaft (36) are assembled and connected together. The hinge according to claim 1, wherein the second hinge body (2) is provided with a sleeve hole (10), and the second sealing connector (33) includes a bearing (331) and a bearing sealing sleeve (332) ), spline shaft head (333), the bearing (331) is sleeved on the other end of the rotating connecting shaft (36), the bearing sealing sleeve (332) is sealingly sleeved on the bearing (331), and the bearing sealing sleeve (333) 332) The seal is embedded in the mandrel tube body (31), the spline shaft head (333) is sleeved on the rotating connecting shaft (36) outside the bearing seal sleeve (332), and the spline shaft head (333) is made It is embedded in the sleeve hole (10) of the second hinge body (2). The hinge according to claim 1, wherein the first hinge body (1) and the second hinge body (2) are respectively composed of a sleeve tube (101) and a fixing plate (102), and the fixing plate (102) ) There are a number of locking holes (120), the side of the fixing plate (102) and the sleeve (101) The outer surfaces are connected, and both ends of the mandrel device (3) are respectively connected in the sleeve cylinder (101) of the first hinge body (1) and the sleeve cylinder (101) of the second hinge body (2). The hinge according to claim 1, wherein the first hinge body (1) is provided with a sleeve hole (10), the first sealed connector (32) has a cylindrical structure, and the first sealed connector (32) The outer end is provided with a spline portion (324), and the spline portion (324) is fitted into the sleeve hole (10) of the first hinge body (1). The hinge according to claim 1, wherein the mandrel tube body (31) is covered with a plane bearing (301), and the plane bearings (301) are respectively located on the first hinge body (1) and the second hinge Between the page body (2). The hinge according to claim 1, wherein the second hinge body (2) is provided with a locking screw (21) which is locked on the second sealing connector (33) and the rotary connecting shaft (36).

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