TWM525730U - Multi-stage auto-adjustment pneumatic cylinder provided with one-way back-stop function for prosthetic knee joint - Google Patents

Description

Multi-section automatic adjustment pneumatic cylinder for prosthetic knee joint with one-way backstop function

The invention relates to a buffer pneumatic cylinder, in particular to a multi-section automatic adjusting pneumatic cylinder for a prosthetic knee joint and a one-way backstop function.

Pressing, the pneumatic cylinder mainly moves through a piston rod relative to a pneumatic cylinder body, thereby compressing the gas, further providing a buffering effect through the compressed gas, and having an automatic recovery characteristic after the external force is removed, therefore, the existing Pneumatic cylinders are widely used in articles around the life to provide a cushioning or shock absorbing effect.

Further, with the rapid development and prosperity of science and technology, the medical technology is changing with each passing day. In addition to providing effective medical treatment for patients or the disabled, it also further enhances the performance of its use, thereby improving the quality of life of users. Therefore, the existing pneumatic cylinder is also applied to the prosthetic knee joint, so that the user can act through the pneumatic cylinder during walking to provide a cushioning effect.

However, the existing pneumatic cylinder for the prosthetic knee joint, such as the prosthetic pneumatic cylinder of the multi-stage pneumatic valve shown in the TW Patent No. M444158 (hereinafter referred to as the previous case), when the piston member 3 undergoes a chronic reciprocating motion during use, The air located in the lower air chamber 212 is discharged through the main passage 113, the first bypass passage 114 and the second bypass passage 15 of the multi-stage pneumatic valve 1 (shown in FIG. 1A in the foregoing), and has a long buffer stroke. In addition, when the user walks quickly, the piston member 3 performs a rapid up and down movement reciprocating motion, and the air in the lower air chamber 212 can only pass through the multi-stage air pressure valve 1 (as shown in Figure 1B of the previous example), the main passage 113 discharges air, and the buffer stroke is short, so that the user's foot The part can have a higher induction force to the external environment (such as the road surface). However, the first set 11 of the multi-stage air pressure valve 1 in the previous case cooperates with the upper and lower movements of the piston member 3 to move left or right to close or open the first part. When the second bypass passage 15 is theoretically, the second bypass passage 15 should be surely closed when the first set 11 is pressed, but the piston member 3 is moved upward due to the rapid up and down movement inertia of the position of the piston member 3. At a short time, the sealing ring 13 cannot reach the position of the bottom end of the second set 12 to close the second bypass passage 15, so that air will flow out of the lower air chamber 212 through the second bypass passage 15. Therefore, the buffering effect of the lower air chamber 212 due to the pressure cannot be achieved, so that the air flow rate of the multi-stage air pressure valve 1 in the previous case is not lower than the air flow rate when the pressure is not pressed, so there is still Need to improve.

Therefore, in view of the lack and deficiency of the existing pneumatic cylinders for the prosthetic knee joints, the present invention has finally developed a novel that can improve the existing defects through continuous experiment and research. The present invention is applied to the prosthetic knees. A multi-stage automatic adjustment pneumatic cylinder with joints and one-way backstop function, which can automatically adjust the corresponding buffering force according to different travel speeds or states through a simplified structure configuration, which is convenient and comfortable for the user. Walking, and thus providing a compact structure, one-way anti-reverse effect and automatically adjust the use of the pneumatic cylinder.

In order to achieve the above object, the present invention provides a multi-stage automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function, which comprises: a body, the body is a hollow cylinder, the body is A pressure chamber is formed in the middle portion, and a rod hole communicating with the air chamber is disposed at a middle portion of the top portion, and the body is provided with an upper air passage communicating with the air chamber and the outside air on one side of the rod hole. The upper air passage is provided with a first check valve, and the body is further provided with a lower air passage communicating with the air chamber and the outside at the bottom; a piston member movably coupled with the body and extending The piston member is provided with a rod body and a plug body, and the bottom end of the rod body extends into the air pressure chamber through the rod hole of the body. The plug body is combined with one end of the rod body extending into the air pressure chamber, thereby dividing the air pressure chamber of the body into two upper and lower upper air chambers and a lower air chamber, and the piston member is located in the plug body of the rod body a connecting air passage is disposed on one side, and a second check valve is disposed in the connecting air passage; a multi-stage pneumatic valve is disposed in the lower air passage of the body and is provided with a first a kit, a second kit, an elastic member and a one-way valve, the first kit is disposed in the lower air passage, the second kit is movably disposed in the first kit, and a a side passage, and the second sleeve radially extends through a second bypass passage communicating with the first bypass passage at an outer surface, the elastic member being located in the first sleeve and surrounding the exterior of the second sleeve, such that The second set is revertible to the initial position after being moved relative to the first set; and the check valve is disposed at an inner end of the first set and adjacent to the second set, the check valve is provided with a valve barrel, a seal a component, a valve cover and a limiting member, the valve cylinder is a hollow cylinder and is inside a partitioning plate is formed to divide the valve tube into a receiving groove and a mounting groove, wherein the receiving groove is disposed near one end of the second sleeve, and the partition plate is laterally penetrated and disposed in the middle portion And a valve hole communicating with the mounting groove, the sealing element is disposed in the receiving groove of the valve barrel and selectively closing the valve hole, and the valve cover is combined with the valve tube to be located in the receiving groove, so that The sealing member is located between the partition plate of the valve cylinder and the valve cover. The valve cover is disposed with a plurality of through holes communicating with the receiving groove. The limiting member is disposed in the receiving groove and abuts against the sealing groove. Between the sealing member and the valve cover, the sealing member abuts against the partition plate to close the valve hole, so that the installation groove does not communicate with the receiving groove.

Further, the upper air passage has a larger diameter than the connecting air passage, and the connecting air passage has a larger diameter than the lower air passage.

Further, the body is provided with a first sealing ring in the rod hole, and the rod body of the piston member abuts against the first sealing ring for closing a gap between the rod body and the rod hole.

Preferably, the plug body of the piston member is sleeved on the outer peripheral surface with a second sealing ring that abuts the inner surface of the body, thereby closing a gap between the plug body and the body.

Preferably, the multi-stage air pressure valve is further provided with two sound-absorbing cottons, and the two sound-absorbing cottons are spaced apart in the lower air passage of the body.

Preferably, one of the sound-absorbing cotton is combined with the mounting groove of the valve cylinder to be located between the lower air passage and the valve cylinder, and the other sound-absorbing cotton is located at the first set away from the one-way valve. One end.

Preferably, the sealing member is provided with a sealing plate and a coupling column, and the sealing plate is annularly disposed in the receiving groove, and the coupling column is combined with a side of the sealing plate away from the partition plate and extends Out of the valve cylinder, the valve cover is provided at the center through a coupling hole which is combined with the coupling column and located between the perforations.

According to the above technical features, the present invention is a multi-segment automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function, which avoids the existing knee joint for prosthetic limbs by allowing air to flow in and out. The pneumatic cylinder has a complex and multi-member air passage design, and further, through the arrangement of the two check valves and the multi-stage pneumatic valve, the outside air can enter the body in one direction, and according to the magnitude and travel of the user. The type automatically adjusts the air flowing into and out of the body, thereby providing a cushioning resistance corresponding to the magnitude and type of the user's force, so that the user can walk conveniently and comfortably, and further, through the plurality of segments. The check valve is installed in the pneumatic valve to move the piston member upward relative to the body, ensuring that the O-ring of the second kit cannot reach the position of the bottom end of the first kit. It can be used as a safety device to prevent the O-ring from reaching the position at the bottom end of the first kit. The body, caused by fast-moving situation of the piston member upwardly, so as to provide a streamlined structure, with one-way non-return effect and can be used to automatically adjust the pneumatic cylinder.

[This new type]

10‧‧‧ Ontology

11‧‧‧Pneumatic chamber

12‧‧‧ rod holes

13‧‧‧First seal ring

14‧‧‧Upper airway

15‧‧‧First check valve

16‧‧‧ lower airway

17‧‧‧Upper air chamber

18‧‧‧Air chamber

20‧‧‧ piston parts

21‧‧‧ rod body

22‧‧‧ body

23‧‧‧Connected airways

24‧‧‧Second check valve

25‧‧‧Second seal ring

30‧‧‧Multi-section air valve

31‧‧‧ first kit

32‧‧‧ second kit

321‧‧‧ first bypass

322‧‧‧second bypass

33‧‧‧Flexible parts

34‧‧‧ check valve

35‧‧‧Music cotton

36‧‧‧ valve cartridge

361‧‧ ‧ partition

362‧‧‧ 容 槽

363‧‧‧Installation slot

364‧‧‧ valve hole

37‧‧‧Sealing components

371‧‧‧ Sealing plate

372‧‧‧ binding column

38‧‧‧ bonnet

381‧‧‧bond hole

382‧‧‧Perforation

39‧‧‧Limited parts

[Prior technology]

1‧‧‧Multi-section air valve

11‧‧‧ first kit

113‧‧‧ main channel

114‧‧‧First bypass

12‧‧‧ second kit

13‧‧‧Seal ring

15‧‧‧second bypass

212‧‧‧Air chamber

3‧‧‧ piston parts

1 is a partial cross-sectional side view of the multi-stage automatic adjustment air cylinder of the present invention for a prosthetic knee joint and having a one-way backstop function.

2 is an enlarged cross-sectional side view of the multi-stage air pressure valve of the multi-stage automatic adjustment air cylinder of the present invention for a prosthetic knee joint and having a one-way backstop function.

3 is a perspective view showing a partial cross-section of a one-way valve of a multi-stage air pressure valve of a multi-stage automatic adjustment air cylinder of the present invention for a prosthetic knee joint and having a one-way backstop function.

4 is a cross-sectional side view of the one-way valve of the multi-stage pneumatic valve of the multi-stage automatic adjustment pneumatic cylinder of the present invention for a prosthetic knee joint and having a one-way backstop function.

Fig. 5 is a side elevational view showing the operation of the piston member of the multi-section automatic adjustment pneumatic cylinder of the present invention for a prosthetic knee joint and having a one-way backstop function.

Fig. 6 is a side view showing the operation of the multi-stage pneumatic valve when the piston member of the multi-stage automatic adjustment pneumatic cylinder of the present invention is used for the prosthetic knee joint and has a one-way backstop function.

Fig. 7 is a side view showing the operation of the check valve when the piston member of the multi-stage automatic adjustment pneumatic cylinder of the present invention is used for the prosthetic knee joint and has a one-way backstop function.

Fig. 8 is a side elevational view showing the operation of the piston member of the multi-stage automatic adjustment pneumatic cylinder of the present invention for a prosthetic knee joint and having a one-way backstop function.

Fig. 9 is a side view showing the operation of the check valve when the piston member of the multi-stage automatic adjustment pneumatic cylinder of the present invention is used for the prosthetic knee joint and has a one-way backstop function.

In order to understand the technical features and practical functions of the present invention in detail and can be implemented according to the contents of the specification, the following further describes the preferred embodiment as shown in the following figure: Please refer to FIG. 1 , the multi-section automatic adjusting pneumatic cylinder for the prosthetic knee joint and having the one-way backstop function is provided with a body 10 , a piston member 20 and a multi-stage pneumatic valve 30 , wherein: The body 10 is a hollow cylinder. The body 10 has a pneumatic chamber 11 formed therein, and a rod hole 12 communicating with the air chamber 11 is disposed at a middle portion of the top portion. Preferably, the body 10 is provided. A first sealing ring 13 is disposed in the rod hole 12, and an upper air passage 14 communicating with the air chamber 11 and the outside air is disposed in a side of the rod hole 12, and the upper air passage 14 is disposed in the upper air passage 14 A first check valve 15 is provided to allow air to enter the air chamber 11 through the upper air passage 14 only by the outside. The body 10 is further provided with an L shape at the bottom and communicates with the air chamber 11 and the outside. Lower airway 16.

The piston member 20 is movably coupled to the body 10 and protrudes from the top of the body 10. The piston member 20 is provided with a rod body 21 and a plug body 22, and the bottom end of the rod body 21 is passed through the body 10. The rod hole 12 extends into the air pressure chamber 11 and abuts against the first sealing ring 13 for closing a gap between the rod body 21 and the rod hole 12, and the plug body 22 is coupled to the rod body 21 The end portion extending into the air pressure chamber 11 is combined, thereby dividing the air pressure chamber 11 of the body 10 into two upper and lower upper air chambers 17 and a lower air chamber 18, wherein the upper air chamber 17 is connected to the upper air passage 14 is communicated, and the lower air chamber 18 communicates with the lower air passage 16 and changes the volume of the upper air chamber 17 and the lower air chamber 18 when the piston member 20 slides relative to the body 10, the piston member 20 A connecting air passage 23 is disposed in a side of the plug body 22 of the rod body 21, and a second check valve 24 is disposed in the connecting air passage 23, so that air of the upper air chamber 17 can enter through the connecting air passage 23. The lower air chamber 18, but the air located in the lower air chamber 18 cannot enter the upper air chamber 17 via the connecting air passage 23, and preferably, the plug body 22 is sleeved on the outer circumference. A second sealing ring 25 is disposed on the inner surface of the body 10 to close the gap between the plug body 22 and the body 10.

Further, since the pneumatic cylinder is subjected to the pressing down time longer than the pulling-up time, the piston member 20 is located at a lower position in the body 10, so that the pressing stroke of the piston member 20 is smaller than the pulling-up stroke, so The piston member 20 can be pulled up quickly, and the aperture of the upper air passage 14 will The diameter of the connecting air passage 23 is larger than the diameter of the connecting air passage 23, and the diameter of the connecting air passage 23 is larger than the diameter of the lower air passage 16, so that the flow rate of the outside air is sucked into the air chamber 11 is greater than the flow rate of the air pressure chamber 11, so that the piston member is 20 can be easily located at a higher position of the body 10.

The multi-stage air valve 30 is disposed in the lower air passage 16 of the body 10 and is provided with a first sleeve 31, a second sleeve 32, an elastic member 33, a check valve 34 and two sound-absorbing cottons 35. The first set 31 is fixed in the lower air passage 16, and the second set 32 is movably disposed in the first set 31, and an annular first bypass passage 321 is formed between the two sets 31, 32. And the second sleeve 32 extends through the second side channel 322 communicating with the first bypass channel 321 on the outer surface. The elastic member 33 is located in the first sleeve 31 and surrounds the outer portion of the second sleeve 32. The second set 32 can be returned to the initial position after being moved relative to the first set 31, wherein the detailed structure and actuation principle between the two sets 31, 32 and the elastic member 33 are as previously claimed by the creator. The patent case (TW M444158) is similar and will not be explained here.

Referring to FIGS. 3 and 4, the check valve 34 is disposed at an inner end of the first sleeve 31 adjacent to the second sleeve 32. The check valve 34 is provided with a valve barrel 36 and a sealing member 37. a valve cover 38 and a limiting member 39, wherein the valve cylinder 36 is a hollow cylindrical body. The valve cylinder 36 is internally provided with a partition 361, and the valve cylinder 36 is divided into a receiving groove 362 and a The mounting groove 363 is disposed at one end of the second sleeve 32, and the mounting groove 363 is disposed at the other end of the valve tube 36. The partition plate 361 is disposed transversely at the middle portion. The valve hole 364 communicating with the receiving groove 362 and the mounting groove 363 allows the receiving groove 362 to communicate with the mounting groove 363 via the valve hole 364.

The sealing member 37 is disposed in the receiving groove 362 of the valve barrel 36 and selectively closes the valve hole 364. The sealing member 37 is provided with a sealing plate 371 and a coupling post 372. The sealing plate 371 is annular and arranged. In the receiving slot 362, the binding post 372 is coupled to a side of the sealing plate 371 away from the partition 361 and extends out of the valve barrel 36. The valve cover 38 is coupled to the valve barrel 36. The sealing member 37 is located between the partition 361 of the valve barrel 36 and the valve cover 38. The valve cover 38 is in the middle. A plurality of coupling holes 381 are formed in the center of the coupling hole 372. The valve cover 38 is spaced apart from the outer periphery of the coupling hole 381 to form a plurality of through holes 382 communicating with the receiving groove 362.

The limiting member 39 is sleeved on the coupling post 372 of the sealing member 37 and abuts between the sealing plate 371 and the valve cover 38 such that the sealing plate 371 of the sealing member 37 regularly abuts the spacer The valve hole 364 is closed on the plate 361, so that the mounting groove 363 is not in communication with the receiving groove 362. Preferably, the limiting member 39 can be a spring or a ventilating elastic body.

Two sound-absorbing cottons 35 are spaced apart from the lower air passage 16 of the body 10. Preferably, a sound-absorbing cotton 35 is coupled to the mounting groove 363 of the valve cylinder 36 to be located in the lower air passage 16 and the valve. Between the canisters 36, and another muffling cotton 35 is located at one end of the first set 31 away from the one-way valve 34. Further, the assembly of the above-described various components of the present invention is a technique well known in the art, and therefore is not illustrated. There is no problem that cannot be implemented. Furthermore, the elastic elements of the check valves 15, 24 in the drawings are schematic representations.

Please refer to FIG. 5 and FIG. 6 , the multi-section automatic adjusting pneumatic cylinder of the present invention for the prosthetic knee joint and having the one-way backstop function, wherein the piston member 20 moves downward relative to the body 10 when in use. The first check valve 15 and the second check valve 24 are opened, so that outside air can enter the upper air chamber 17 via the upper air passage 14 and enter the lower air chamber 18 via the connecting air passage 23, Finally, the lower air passage 16 is further pushed, and as shown in FIG. 7, the sealing member 37 is pushed to move relative to the valve cylinder 36 to compress the limiting member, so that a gap is formed between the sealing plate 371 and the valve hole 364. The air in the lower air passage 16 can flow between the two sets 31, 32 via the gap, the receiving groove 362 and the perforations 382 of the valve cover 38, and is discharged through the two side passages 321, 322. Outside the body 10.

Wherein, since the aperture of the upper air passage 14 is larger than the aperture of the communication air passage 23, and the aperture of the communication air passage 23 is larger than the aperture of the lower air passage 16, when the piston member 20 moves downward relative to the body 10, The flow rate of the air discharged from the air passage 16 is smaller than the flow rate of the air filled in the upper air passage, so that the air pressure of the lower air chamber 18 is higher than the air pressure of the upper air chamber 17, thereby providing the piston member 20. a cushioning force, so that the user does not feel uncomfortable during walking, and the multi-stage air pressure valve 30 can automatically adjust the flow rate of the filling and discharging air according to the force applied by the user to the piston member 20, thereby Providing a buffering force corresponding to the force applied by the user, thereby satisfying the state in which the user walks at different speeds or different forces (slow walking, quick walking or small running), no need to replace or set pressure, and is relatively convenient to use. And more flexible.

Further, as shown in FIG. 8 , when the piston member 20 moves upward relative to the body 10 , the second check valve 24 is opened to allow air located in the lower air chamber 18 to enter the air passage 23 . The upper air chamber 17 in which the sealing plate 371 of the sealing member 37 abuts against the partition 361 of the valve cylinder 36, so that the valve hole 364 and the receiving groove 362 are not in communication with each other. Therefore, when outside air enters the multi-stage air valve 30 through the lower air passage 16, the outside air is blocked by the one-way valve 34, and cannot enter the lower portion of the body 10 via the lower air passage 16. In the air chamber 18, when the piston member is moved upward relative to the body 10, the filled air cannot be supplied from the outside, thereby providing a buffering force for the upward movement of the piston member 20, so that the piston member 20 does not suddenly face upward. Move, which in turn causes discomfort to the user.

According to the above technical features, the present invention is a multi-segment automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function, which avoids the existing knee joint for prosthetic limbs by allowing air to flow in and out. The pneumatic cylinder needs to have a complicated and multi-component air passage design, and further, through the two check valves 15, 24 and the multi-stage pneumatic valve 30, the outside air can enter the body 10 in one direction, and according to the user. The magnitude of the force applied and the type of travel automatically adjusts the air flowing into and out of the body 10, thereby providing a cushioning resistance corresponding to the magnitude of the user's force and the type of the configuration, so that the user can walk conveniently and comfortably. Further, the present invention ensures that the O-ring of the second set 32 is ensured during the movement of the piston member 20 upward relative to the body 10 by installing the check valve 34 in the multi-stage pneumatic valve 30. If the position of the bottom end of the first kit 31 cannot be reached, it can be used as a safety device to prevent the O-ring from being able to reach the position of the bottom end of the first kit 31. The problem described in the previous case effectively prevents the outside air from entering the body 10, thereby causing the piston member 20 to move up quickly, thereby providing a pneumatic cylinder having a compact structure, a one-way anti-reverse effect and automatically adjustable use.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any person having ordinary knowledge in the art can use the present invention without departing from the technical features of the present invention. Equivalent embodiments of the novel modifications or modifications made by the novel teachings are still within the scope of the novel features.

10‧‧‧ Ontology

11‧‧‧Pneumatic chamber

12‧‧‧ rod holes

13‧‧‧First seal ring

14‧‧‧Upper airway

15‧‧‧First check valve

16‧‧‧ lower airway

17‧‧‧Air chamber

18‧‧‧Upper air chamber

20‧‧‧ piston parts

21‧‧‧ rod body

22‧‧‧ body

23‧‧‧Connected airways

24‧‧‧Second check valve

25‧‧‧Second seal ring

31‧‧‧ first kit

32‧‧‧ second kit

34‧‧‧ check valve

35‧‧‧Music cotton

Claims (12)

A one-way valve for a prosthetic knee joint and having a one-way backstop function is provided with: a valve cylinder, which is a hollow cylinder and has a partition inside, and the valve cylinder is divided into a cavity a groove and a mounting groove are formed in the middle portion, and a valve hole communicating with the receiving groove and the mounting groove is formed transversely in the middle portion; a sealing member is disposed in the receiving groove of the valve tube And optionally closing the valve hole; a valve cover, the valve cover is combined with the valve cylinder and located in the receiving groove, the sealing element is located between the diaphragm of the valve cylinder and the valve cover, the valve The cover interval is provided with a plurality of through holes communicating with the receiving groove; and a limiting member is disposed in the receiving groove and abutting between the sealing member and the valve cover, so that the sealing member is resisted The valve hole is closed on the partition plate so that the installation groove does not communicate with the receiving groove. The one-way valve for a prosthetic knee joint and having a one-way backstop function according to claim 1, wherein the sealing member is provided with a sealing plate and a coupling column, and the sealing plate has a ring shape and is disposed in the receiving groove. The binding column is combined with a side of the sealing plate away from the partition plate and protrudes outside the valve barrel, and the valve cover is provided at the center with a combination of the coupling column and the perforations. hole. A check valve for a prosthetic knee joint according to claim 1 or 2, which has a one-way backstop function, wherein the limit member is a spring. A one-way valve for a prosthetic knee joint and having a one-way backstop function according to claim 1 or 2, wherein the stopper is a ventilated elastomer. A multi-stage automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function is provided with: a body, the body is a hollow cylinder, the body forms a pneumatic chamber inside, and is in the middle of the top a rod hole communicating with the air pressure chamber is disposed through the body, and the body penetrates through one side of the rod hole Providing an upper air passage communicating with the air pressure chamber and the outside air, wherein the upper air passage is provided with a first check valve, and the body is further provided with a lower air passage communicating with the air chamber and the outside at the bottom; a piston The piston member is movably coupled to the body and protrudes from the top of the body. The piston member is provided with a rod body and a plug body. The bottom end of the rod body extends into the air chamber through the rod hole of the body. The plug body is combined with one end of the rod body extending into the air pressure chamber, thereby dividing the air pressure chamber of the body into two upper and lower upper air chambers and a lower air chamber, and the piston member is in the plug at the rod body a connecting air passage is disposed on one side of the body, and a second check valve is disposed in the connecting air passage; a multi-stage air pressure valve is disposed in the lower air passage of the body and is provided with a first a kit, a second kit, an elastic member and a one-way valve, the first kit is disposed in the lower air passage, the second kit is movably disposed in the first kit, and a pair is formed between the two kits a first bypass passage, and the second sleeve is radially penetrated from the outer surface a second bypass passage communicating with the passageway, the elastic member being located in the first sleeve and surrounding the exterior of the second sleeve, the second kit being movable relative to the first sleeve to return to an initial position; and the single a valve is disposed at an inner end of the first set and adjacent to the second set, the check valve is provided with a valve barrel, a sealing component, a valve cover and a limiting member, the valve cylinder is a hollow cylinder and A partition is disposed in the interior, and the valve tube is divided into a receiving groove and a mounting groove, wherein the receiving groove is disposed near one end of the second sleeve, and the partition is laterally penetrated and disposed at the middle portion a valve hole is disposed in the receiving groove of the valve tube, and the sealing member is disposed in the receiving groove of the valve tube and selectively closes the valve hole, and the valve cover is combined with the valve tube to be located in the receiving groove The sealing member is disposed between the partition plate of the valve cylinder and the valve cover, and the valve cover is disposed with a plurality of perforations communicating with the receiving groove. The limiting member is disposed in the receiving groove and abuts Between the sealing member and the valve cover, the sealing member is abutted against the partition plate to seal The valve hole, so that the installation groove does not communicate with the receiving groove disposed. The multi-segment automatic adjustment pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function according to claim 5, wherein a diameter of the upper air passage is larger than an aperture of the communication air passage, and a diameter of the communication air passage is larger than the lower The pore size of the airway. The multi-section automatic adjustment pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function according to claim 5 or 6, wherein the body is provided with a first sealing ring in the rod hole, and the rod body of the piston member Abutting the first sealing ring to close a gap between the rod body and the rod hole. The multi-segment automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function according to claim 7, wherein the plug body of the piston member is sleeved on the outer peripheral surface with a surface abutting the inner surface of the body a sealing ring for closing a gap between the plug body and the body. The multi-section automatic adjusting pneumatic cylinder for the prosthetic knee joint and having the one-way backstop function according to claim 8, wherein the multi-stage air pressure valve is further provided with two sound-absorbing cottons, and the two sound-absorbing cottons are disposed under the body. Inside the airway. A multi-stage automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function according to claim 9, wherein a sound-absorbing cotton system is combined with the installation groove of the valve cylinder to be located in the lower air passage and the Between the valve cartridges, and another muffling cotton is located at one end of the first kit away from the one-way valve. The multi-section automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function according to claim 10, the sealing member is provided with a sealing plate and a coupling column, and the sealing plate has a ring shape and is disposed in the capacity In the groove, the binding column is combined with a side of the sealing plate away from the partition plate and protrudes outside the valve cylinder, and the valve cover is disposed at a center thereof and is coupled with the coupling column and located between the perforations Binding holes. The multi-segment automatic adjusting pneumatic cylinder for a prosthetic knee joint and having a one-way backstop function according to claim 5 or 6, wherein the sealing member is provided with a sealing plate and a coupling post, the sealing plate is annular and disposed on In the receiving groove, the binding post is combined with a side of the sealing plate away from the partition plate and protrudes Outside the valve cylinder, the valve cover is provided at the center through a coupling hole which is combined with the coupling column and located between the perforations.