Force-multiplying mechanical locking type air cylinder

Abstract

The utility model discloses a double-force type mechanical locking type air cylinder which comprises a cylinder body, a piston assembly and a locking device, the piston assembly and the locking device are arranged in the cylinder body, a piston rod is movably inserted in the cylinder body, the piston assembly comprises a first piston and a second piston which are sequentially distributed in the height direction, and an airflow channel is formed in the piston assembly. Air flow can be distributed to the surfaces of the first piston and the second piston through the air flow channel so as to drive the piston assembly to drive the piston rod to move in the height direction of the cylinder body, and the locking device is used for locking and fixing the piston rod after the piston rod moves to the working position. By arranging the two pistons which are connected up and down, the initial output force of the air cylinder can be obviously increased under the condition that the diameter of the air cylinder is not increased; and by arranging the locking device, the piston rod can be locked and fixed after moving to the working position, and the axial retaining force and stability of the air cylinder during working are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinders, and particularly relates to a force-multiplying mechanical locking cylinder. Background Art

[0002] The output force of the cylinder is used to control and drive the mechanical components to act or keep the object fixed. For example, in an automated system, it controls pushing, pulling, and rotating actions, and in mechanical manufacturing, it holds the workpiece firmly to keep it stable.

[0003] In a traditional cylinder, generally a piston is installed inside the cylinder body. During operation, air flow is sent into the cylinder body to drive the piston to drive the piston rod to move vertically. However, in actual use, for a cylinder with a smaller model, its output force is insufficient and cannot meet the usage requirements, while for a cylinder with a larger model, the cylinder diameter is too large and the usage occasions are limited. Secondly, during the operation of the cylinder, it is necessary to continuously send air flow to the bottom of the piston to keep the cylinder in the working state. Once the air flow transmission is interrupted, or the air pressure fluctuates, and affected by factors such as the reverse extrusion force of the load, there will be a problem that the working posture of the cylinder is unstable. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a force-multiplying mechanical locking cylinder, aiming to solve the above technical problems.

[0005] The technical problems solved by the utility model are realized by the following technical solutions: <U+

[0006] A cylinder body, in which a piston rod is movably inserted, and an air inlet hole communicating with the inner cavity of the cylinder body is provided on the side wall;

[0007] A piston assembly, arranged in the inner cavity of the cylinder body and connected to the piston rod. The piston assembly includes a first piston and a second piston which are sequentially distributed along the height direction. An air flow channel is provided on the piston assembly. When air flow is introduced into the cylinder body, the air flow can be split through the air flow channel to the surfaces of the first piston and the second piston, so as to drive the piston assembly to drive the piston rod to move along the height direction of the cylinder body;

[0008] A locking device, arranged in the inner cavity of the cylinder body. The locking device is sleeved outside the piston rod and is used to lock and fix the piston rod after the piston rod moves to the working position.

[0009] In some embodiments, the air flow channel includes:

[0010] A first air flow channel, communicating the first lower surface of the first piston and the second lower surface of the second piston, so as to guide the air flow introduced into the lower part of the inner cavity of the cylinder body to the second lower surface of the second piston;

[0011] A second air flow passage communicates with the second upper surface of the second piston and the first upper surface of the first piston to guide the air flow introduced into the upper part of the cylinder inner cavity to the first upper surface of the first piston.

[0012] In some embodiments, the first air flow passage includes a first inlet passage and a first outlet passage connected in sequence. The inlet end of the first inlet passage penetrates the first lower surface of the first piston, and the outlet end of the first outlet passage is close to the second lower surface of the second piston; and / or

[0013] The second air flow passage includes a second inlet passage and a second outlet passage connected in sequence. The inlet end of the second inlet passage penetrates the second upper surface of the second piston, and the outlet end of the second outlet passage is close to the first upper surface of the first piston.

[0014] In some embodiments, the piston assembly is connected to the bottom of the piston rod by a screw;

[0015] A first inlet passage is formed between the outer peripheral wall of the screw and the inner peripheral wall of the piston assembly.

[0016] In some embodiments, the cylinder body includes a first chamber and a second chamber that are sequentially distributed and interconnected in the height direction. The air inlet holes include a first ventilation hole and a second ventilation hole opened on the side wall of the cylinder body. The first ventilation hole communicates with the bottom of the first chamber, and the second ventilation hole communicates with the bottom of the second chamber and / or the top of the first chamber;

[0017] The piston assembly is disposed in the first chamber, and the locking device is disposed in the second chamber.

[0018] In some embodiments, a flow passage communicating the second chamber and the second air flow passage is formed on the piston rod.

[0019] In some embodiments, a first locking portion is provided on the piston rod;

[0020] The locking device includes:

[0021] A locking assembly is disposed in the cylinder body and sleeved outside the piston rod. A second locking portion is provided on the locking assembly;

[0022] An extrusion assembly is disposed in the cylinder body and sleeved outside the locking assembly. The extrusion assembly is slidably disposed along the axial direction of the cylinder body to extrude or release the locking assembly, so that the second locking portion contacts or separates from the first locking portion to lock or release the piston rod.

[0023] In some embodiments, the first locking portion includes a recessed portion recessed inwardly on the outer circumference of the piston rod, and a first locking inclined surface is formed on the recessed portion;

[0024] The second locking portion includes a locking space of variable size, an inner wall of the locking space is formed with a second locking inclined surface, and the piston rod passes through the locking space;

[0025] When the piston rod is in a locked state, the locking space is clamped in the recess, and the second locking inclined surface abuts against the first locking inclined surface.

[0026] In some embodiments, the locking assembly includes:

[0027] At least two locking members connected end to end;

[0028] A first elastic member is connected between at least two locking members. The first elastic member is used to elastically deform when the locking assembly is subjected to an external force, and to reset when the external force disappears, thereby causing at least two locking members to move closer to or further away from each other to adjust the size of the locking assembly.

[0029] In some embodiments, the extrusion assembly comprises:

[0030] An extrusion sleeve, which is sleeved on the outside of the locking assembly and can slide in the cylinder along the axial direction;

[0031] The second elastic member has one end connected to the top wall of the cylinder body and the other end connected to the end of the extrusion sleeve facing away from the locking assembly.

[0032] The beneficial effects of the utility model are:

[0033] The force - multiplying mechanical locking cylinder of the present utility model introduces air flow into the bottom of the cylinder cavity through the air inlet hole on the side wall of the cylinder block. Part of the air flow diffuses on the bottom surface of the first piston and generates a force on the bottom of the first piston to push the first piston upward. Another part of the air flow enters the bottom of the second piston along one of the air flow channels and diffuses on the bottom surface of the second piston to push the second piston upward. When the two pistons move upward, they drive the piston rod connected to them to move. After the piston rod moves to the working position, the locking device is driven to act to lock and fix the piston rod, thereby restricting the axial movement of the piston rod and keeping the piston rod in a stable working posture. It can be seen that by arranging two pistons connected up and down at the bottom of the piston rod, without increasing the cylinder diameter of the cylinder, the initial output force of the cylinder is effectively improved, meeting the occasions with high requirements for the output force. Secondly, by setting the locking device, the piston rod can be locked and fixed after moving to the working position, preventing problems such as the displacement of the piston rod caused by the interruption of the air flow delivered to the bottom of the piston, air pressure fluctuation, and the reverse extrusion force of the load, effectively improving the axial holding force and stability during the operation of the cylinder. Brief Description of the Drawings

[0034] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following - described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a three - dimensional structure schematic diagram of the force - multiplying mechanical locking cylinder of the present utility model in an embodiment;

[0036] Figure 2 It is a sectional view of the force - multiplying mechanical locking cylinder of the present utility model in an embodiment (the piston - rod release state);

[0037] Figure 3 It is a sectional view of the force - multiplying mechanical locking cylinder of the present utility model in an embodiment (the piston - rod locking state);

[0038] Figure 4 It is a connection structure diagram of the piston rod and the piston assembly in the force - multiplying mechanical locking cylinder of the present utility model in an embodiment;

[0039] Figure 5 For Figure 4 sectional view;

[0040] Figure 6 It is a three - dimensional structure schematic diagram of the piston rod in the force - multiplying mechanical locking cylinder of the present utility model in an embodiment;

[0041] Figure 7 Cross-sectional view of the locking device in the force-multiplying mechanical locking cylinder according to the embodiment of the present utility model;

[0042] Figure 8 Schematic perspective view of the locking assembly in the force-multiplying mechanical locking cylinder according to the embodiment of the present utility model;

[0043] Figure 9 Front view of the locking assembly in the force-multiplying mechanical locking cylinder according to the embodiment of the present utility model (locking state);

[0044] Figure 10 Front view of the locking assembly in the force-multiplying mechanical locking cylinder according to the embodiment of the present utility model (released state);

[0045] Figure 11 Cross-sectional view of the extrusion sleeve in the force-multiplying mechanical locking cylinder according to the embodiment of the present utility model.

[0046] The above-mentioned reference numerals:

[0047] 10 - cylinder block; 11 - first chamber; 111 - lower chamber; 112 - upper chamber; 12 - second chamber; 13 - first vent hole; 14 - second vent hole;

[0048] 20 - piston assembly; 21 - first piston; 211 - first lower surface; 212 - first upper surface; 22 - second piston; 221 - second lower surface; 222 - second upper surface; 23 - first air flow channel; 231 - first inlet channel; 232 - first outlet channel; 24 - second air flow channel; 241 - second inlet channel; 242 - second outlet channel;

[0049] 30 - locking device; 31 - locking assembly; 310 - locking member; 320 - first elastic member; 330 - guide shaft; 311 - second locking portion; 3111 - locking space; 3112 - second locking inclined surface; 314 - inclined surface one; 32 - extrusion assembly; 321 - extrusion sleeve; 3211 - inclined surface two; 3212 - annular groove; 322 - second elastic member;

[0050] 50 - piston rod; 51 - flow channel; 52 - first locking portion; 521 - recess; 522 - first locking inclined surface;

[0051] 60 - screw;

[0052] 70 - reflection ring. Detailed implementation manners

[0053] To enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present utility model.

[0054] It should be noted that similar reference numerals represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0055] It should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is habitually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0056] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0057] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0058] Please refer to Figures 1 to 11 As shown, this force-multiplying mechanical locking type cylinder includes a cylinder block 10, a piston assembly 20, and a locking device 30.

[0059] The cylinder block 10 has a structure with a cavity inside and at least one end being open. In this embodiment, for the convenience of disassembling and assembling the components inside the cylinder block 10, the cylinder block 10 may include a hollow cylinder barrel and a front cover and a rear cover respectively connected to the two open ends of the cylinder barrel. The front cover and the rear cover are both hermetically connected to the cylinder barrel through sealing rings. A piston rod 50 is movably inserted into the cylinder block 10, and an air inlet communicating with the inner cavity of the cylinder block 10 is provided on the side wall.

[0060] The piston assembly 20 is arranged in the inner cavity of the cylinder block 10 and connected to the bottom end of the piston rod 50. The piston assembly 20 includes a first piston 21 and a second piston 22 which are sequentially distributed in the height direction. An air flow channel is provided on the piston assembly 20. Multiple air flow channels can be provided. When air flow is introduced into the cylinder block 10, the air flow can be split through the air flow channels to the surfaces of the first piston 21 and the second piston 22, so as to drive the piston assembly 20 to drive the piston rod 50 to move along the height direction of the cylinder block 10.

[0061] The locking device 30 is arranged in the inner cavity of the cylinder block 10. The locking device 30 is sleeved outside the piston rod 50 and is used to lock and fix the piston rod 50 after the piston rod 50 moves to the working position.

[0062] It should be noted that in this embodiment, the working position refers to the position where the piston rod 50 moves axially upward along the cylinder block 10 to clamp and fix the workpiece.

[0063] For the double-force mechanical locking type cylinder provided by the present utility model, during operation, air flow is introduced into the bottom of the inner cavity of the cylinder block 10 through the air inlet hole on the side wall of the cylinder block 10. A part of the air flow diffuses on the bottom surface of the first piston 21 and generates a force on the bottom of the first piston 21 to push the first piston 21 to move upward. Another part of the air flow enters the bottom of the second piston 22 along one of the air flow channels and diffuses on the bottom surface of the second piston 22 to push the second piston 22 to move upward. When the two pistons move upward, they drive the piston rod 50 connected thereto to move. After the piston rod 50 moves to the working position, the locking device 30 is driven to act to lock and fix the piston rod 50, thereby restricting the axial movement of the piston rod 50 and enabling the piston rod 50 to maintain a stable working posture. It can be seen that the present utility model effectively improves the initial output force of the cylinder without increasing the cylinder diameter by arranging two pistons connected up and down at the bottom of the piston rod 50, meeting the occasions with high requirements for the output force; secondly, by arranging the locking device 30, the piston rod 50 can be locked and fixed after it moves to the working position, preventing the problem that the piston rod 50 is displaced due to the interruption of the air flow delivered to the bottom of the piston, air pressure fluctuation and the reverse extrusion force of the load during the working process, and effectively improving the axial holding force and stability of the cylinder during operation.

[0064] In some embodiments of the present application, such as Figure 3As shown, the air flow channel may include a first air flow channel 23 and a second air flow channel 24. The first air flow channel 23 communicates with the first lower surface 211 of the first piston 21 and the second lower surface 221 of the second piston 22 to guide the air flow introduced into the lower part of the inner cavity of the cylinder block 10 to the second lower surface 221 of the second piston 22, thereby driving the second piston 22 to move upward. The second air flow channel 24 communicates with the second upper surface 222 of the second piston 22 and the first upper surface 212 of the first piston 21 to guide the air flow introduced into the upper part of the inner cavity of the cylinder block 10 to the first upper surface 212 of the first piston 21, thereby driving the first piston 21 to move downward.

[0065] Specifically, in some embodiments of the present application, the cylinder block 10 may include a first chamber 11 and a second chamber 12 that are sequentially distributed and communicate with each other in the height direction. The first chamber 11 and the second chamber 12 may be separated by a limiting plate. The limiting plate may be integrally formed with the inner wall of the cylinder block 10 and fixed to the cylinder block 10, or may be detachably connected to the inner wall of the cylinder block 10 through a snap ring. The piston assembly 20 is disposed in the first chamber 11, the locking device 30 is disposed in the second chamber 12, one end of the piston rod 50 is connected to the piston assembly 20, and the other end passes through the limiting plate and the second chamber 12 and extends to the outside of the cylinder block 10. The air inlet holes may include a first ventilation hole 13 and a second ventilation hole 14 opened on the side wall of the cylinder block 10. The first ventilation hole 13 communicates with the bottom of the first chamber 11. The second ventilation hole 14 may directly communicate with the bottom of the second chamber 12, or may directly communicate with the top of the first chamber 11, or may simultaneously communicate with the bottom of the second chamber 12 and the top of the first chamber 11. In the embodiments of the present application, the case where the second ventilation hole 14 communicates with the bottom of the second chamber 12 is taken as an example for description.

[0066] When it is necessary to drive the piston rod 50 to move upward, air flow is introduced into the bottom of the first chamber 11 through the first ventilation hole 13. Part of the air flow diffuses on the first lower surface 211 of the first piston 21 to push the first piston 21 upward, and the other part of the air flow enters the lower space of the second piston 22 through the first air flow channel 23 and diffuses on the second lower surface 221 of the second piston 22 to push the second piston 22 upward.

[0067] When it is necessary to drive the piston rod 50 to move downward, air flow is introduced into the bottom of the second chamber 12 through the second vent hole 14. As the air pressure in the second chamber 12 gradually increases, a force is generated on the bottom surface of the locking device 30 to drive the locking device 30 to act, thereby releasing the piston rod 50. At the same time, the air flow in the second chamber 12 flows downward along the gap on the side wall of the piston rod 50 to the top surface of the first chamber 11. A part of the air flow entering the first chamber 11 diffuses on the second upper surface 222 of the second piston 22 to drive the second piston 22 to move downward, and the other part of the air flow enters the upper space of the first piston 21 through the second air flow channel 24 and diffuses on the first upper surface 212 of the first piston 21 to drive the first piston 21 to move downward.

[0068] Wherein, a flow channel 51 communicating the second chamber 12 with the second air flow channel 24 may be provided on the piston rod 50, so that the air flow in the second chamber 12 can directly enter the second air flow channel 24 through the flow channel 51, thereby accelerating the downward movement speed of the first piston 21.

[0069] In some embodiments of the present application, referring to Figure 2 and Figure 3 As shown, a reflection ring 70 may be provided in the first chamber 11. The reflection ring 70 divides the first chamber 11 into a lower chamber 111 and an upper chamber 112. The first piston 21 slides inside the lower chamber 111, and the second piston 22 slides inside the upper chamber 112. Since there is a first cavity between the first upper surface 212 of the first piston 21 and the lower surface of the reflection ring 70, and a second cavity between the second lower surface 221 of the second piston 22 and the upper surface of the reflection ring 70, therefore, to ensure the normal operation of the two pistons, when the piston rod 50 moves up and down, the first air flow channel 23 and the second air flow channel 24 are in a state of working simultaneously.

[0070] Specifically, when air flow is introduced into the first vent hole 13, the first air flow channel 23 is used to introduce the air flow into the lower space of the second piston 22, and the second air flow channel 24 is used to discharge the air flow remaining in the first cavity on the upper surface of the first piston 21, so as to ensure the normal upward movement of the two pistons. [[ID=...]]

[0071] When air flow is introduced into the second vent hole 14, the second air flow channel 24 is used to introduce the air flow into the upper space of the first piston 21, and the first air flow channel 23 is used to discharge the air flow remaining in the second cavity on the lower surface of the second piston 22, so as to ensure the normal downward movement of the two pistons.

[0072] Further, referring to Figure 5, in some embodiments of the present application, the first air flow channel 23 may include a first inlet channel 231 and a first outlet channel 232 connected in sequence. The first inlet channel 231 may be arranged along the axial direction of the piston assembly 20, and its inlet end penetrates the first lower surface 211 of the first piston 21. In this way, the air flow introduced into the bottom of the first chamber 11 can enter the first inlet channel 231 through the inlet end. The first outlet channel 232 is arranged on the side wall of the second piston 22 and along the radial direction of the second piston 22. The outlet end of the first outlet channel 232 may be close to the second lower surface 221 of the second piston 22. In this way, after passing through the first outlet channel 232, the air flow can directly act on the second lower surface 221 of the second piston 22 to push the second piston 22 upward.

[0073] Please continue to refer to Figure 5 , in some embodiments of the present application, the second air flow channel 24 may include a second inlet channel 241 and a second outlet channel 242 connected in sequence. The second inlet channel 241 may be arranged along the axial direction of the second piston 22, and its inlet end penetrates the second upper surface 222 of the second piston 22. In this way, the air flow introduced into the second chamber 12 directly enters the second inlet channel 241 after passing through the flow channel 51. The second outlet channel 242 may be an annular groove formed on the outer peripheral side of the second piston 22. The second outlet channel 242 is close to the first upper surface 212 of the first piston 21. In this way, after passing through the second inlet channel 241, the air flow diffuses to the first upper surface 212 of the first piston 21 through the second outlet channel 242 to push the first piston 21 downward.

[0074] Please continue to refer to Figure 5 , the piston assembly 20 and the bottom of the piston rod 50 may be connected by a screw rod 60. The screw rod 60 may be connected to the first piston 21 and sequentially penetrate through the second piston 22 and the piston rod 50 from the bottom of the first piston to fix the first piston 21, the second piston 22, and the piston rod 50. Among them, a first inlet channel 231 is formed between the outer peripheral wall of the screw rod 60 and the inner peripheral wall of the piston assembly 20.

[0075] Please refer to Figure 2 , Figure 3 , Figure 6 and Figure 8 , in some embodiments of the present application, a first locking portion 52 is formed on the peripheral side of the piston rod 50 located inside the cylinder block 10. Among them, the first locking portion 52 may be a wedge-shaped groove recessed in the peripheral side of the piston rod 50.

[0076] The locking device 30 may include a locking assembly 31 and an extrusion assembly 32. The locking assembly 31 is arranged inside the cylinder block 10 and sleeved outside the piston rod 50. A second locking portion 311 is provided on the locking assembly 31. The second locking portion 311 may be a wedge-shaped portion adapted to the first locking portion 52.

[0077] The extrusion assembly 32 is disposed within the cylinder block 10 and sleeved outside the locking assembly 31. The extrusion assembly 32 is slidably disposed along the axial direction of the cylinder block 10 to extrude or release the locking assembly 31, so that the second locking portion 311 contacts or separates from the first locking portion 52, thereby locking or releasing the piston rod 50.

[0078] Specifically, when the piston rod 50 moves upward to the working position, the extrusion assembly 32 slides along the inner wall of the cylinder block 10 towards the direction close to the locking assembly 31, and inwardly extrudes the locking assembly 31, causing the locking assembly 31 to continuously shrink inwardly in the radial direction until the second locking portion 311 is in full contact with the first locking portion 52. At this time, the locking assembly 31 is in a locked state, and the piston rod 50 is restricted from moving axially downward.

[0079] When the piston rod 50 needs to release the workpiece, the extrusion assembly 32 slides along the inner wall of the cylinder block 10 towards the direction away from the locking assembly 31 to release the extrusion force on the locking assembly 31, causing the locking assembly 31 to continuously expand outwardly in the radial direction. The second locking portion 311 moves away from the first locking portion 52, and the locking assembly 31 releases the locking of the piston rod 50, enabling the piston rod 50 to move axially downward along the cylinder block 10.

[0080] Therefore, when the piston rod 50 of the mechanical locking type cylinder with double force in the present application moves upward to the working position, the extrusion assembly 32 moves along the direction close to the locking assembly 31 and extrudes the locking assembly 31, causing the locking assembly 31 to deform inwardly in the radial direction, so that the second locking portion 311 provided on the inner wall of the locking assembly 31 abuts against the first locking portion 52 on the piston rod 50, quickly locking and fixing the piston rod 50, thereby restricting the axial movement of the piston rod 50. Since the locking between the piston rod 50 and the locking assembly 31 is a mechanical locking method, after the locking action is completed, it is not necessary to supply air flow to the bottom of the piston assembly 20 to enable the piston rod 50 to maintain a stable working posture. This not only saves energy, but also the holding force during the operation of the cylinder is not affected by the fluctuation of the air pressure, and there will be no problem of gas compression displacement of the piston rod 50 caused by the reverse extrusion force of the load, effectively improving the axial holding force and stability during the operation of the cylinder.

[0081] Please refer to Figure 6 , in some embodiments of the present application, the first locking portion 52 may include a recess 521. A first locking inclined surface 522 is formed on the recess 521. The recess 521 is disposed along the circumferential direction of the piston rod 50 and is concave on the outer peripheral side of the piston rod 50. The first locking inclined surface 522 may be disposed on the top surface of the recess 521 close to the extrusion assembly 32 and is inclined downward and inward. As Figures 8 to 10As shown, the second locking portion 311 may include a locking space 3111 with variable size. A second locking slope 3112 is formed on the inner wall of the locking space 3111. The second locking slope 3112 may be disposed at the upper part of the inner wall of the locking space 3111 and is inclined downward and inward. The inclination of the second locking slope 3112 matches that of the first locking slope 522. When the piston rod 50 is in a locked state, the locking space 3111 is sleeved on the recess 521, and the second locking slope 3112 abuts against the first locking slope 522, thereby locking the piston rod 50 to limit the axial movement of the piston rod 50. Through the cooperation of the recess 521 and the locking space 3111, the piston rod 50 can be snap-connected to the locking assembly 31, thereby improving the connection stability between the two; through the butt-joint of the two locking slopes, the contact area between the piston rod 50 and the locking assembly 31 can be increased, which not only increases the locking force, but also as long as the first locking slope 522 on the piston rod 50 contacts the second locking slope 3112 on the locking assembly 31, the locking assembly 31 can be quickly snapped into the recess 521 to lock the piston rod 50.

[0082] Please refer to Figures 8 to 10 , in some embodiments of the present application, the locking assembly 31 may include at least two locking members 310 and a first elastic member 320 connected between the at least two locking members 310.

[0083] Among them, the locking member 310 may be an arc-shaped block. At least two locking members 310 are connected end to end to enclose a closed locking ring. At least two locking members 310 can move relative to each other in the radial direction. When at least two locking members 310 move towards each other, the locking ring becomes smaller in the radial direction, and the second locking portion 311 contacts the first locking portion 52. When at least two locking members 310 move away from each other, the locking ring becomes larger in the radial direction, and the second locking portion 311 separates from the first locking portion 52.

[0084] It should be noted that at least two locking members 310 means that the number of locking members 310 is two or more. At least two locking members 310 can be sleeved on each other or movably connected through a guide shaft 330. The first elastic member 320 can be sleeved outside the guide shaft 330, and both ends of the first elastic member 320 are fixedly connected to two adjacent locking members 310 respectively. When the pressing assembly 32 moves downward to press the locking assembly 31, it can make multiple locking members 310 move towards each other and compress the first elastic member 320, making the locking assembly 31 smaller in the radial direction, thereby locking and fixing the piston rod 50; when the pressing assembly 32 moves upward to release the locking assembly 31, the first elastic member 320 recovers its deformation and drives multiple locking members 310 to move away from each other, making the locking assembly 31 larger in the radial direction, thereby releasing the piston rod 50.

[0085] Among them, the first elastic member 320 includes but is not limited to springs and O-rings. By providing the first elastic member 320, the locking assembly 31 can be automatically reset to release the piston rod 50 when the external force disappears, enabling the piston rod 50 to move freely.

[0086] Please refer to Figure 2 and Figure 3 , in some embodiments of the present application, the extrusion assembly 32 may include an extrusion sleeve 321 and a second elastic member 322. The extrusion sleeve 321 is sleeved outside the locking assembly 31 and can slide axially within the cylinder block 10. When the extrusion sleeve 321 slides downward, it can generate a radially inward extrusion force on the locking assembly 31, forcing the locking assembly 31 to shrink radially inward. When the extrusion sleeve 321 slides upward, it can release the extrusion force on the locking assembly 31, enabling the locking assembly 31 to expand radially outward. One end of the second elastic member 322 is connected to the top wall of the cylinder block 10, and the other end is connected to the end of the extrusion sleeve 321 facing away from the locking assembly 31. When air flow is introduced into the bottom of the second chamber 12, it can push the extrusion sleeve 321 upward to release the extrusion force on the locking assembly 31. The locking assembly 31 expands radially outward to release the clamping of the piston rod 50. At the same time, the extrusion sleeve 321 generates an upward acting force on the second elastic member 322, forcing the second elastic member 322 to be compressed and deformed. When air flow is introduced into the bottom of the first chamber 11, it can push the piston assembly 20 to drive the piston rod 50 upward. At the same time, the second elastic member 322 elongates to recover its deformation and pushes the extrusion sleeve 321 downward to extrude the locking assembly 31, causing the locking assembly 31 to shrink radially inward to lock and fix the piston rod 50.

[0087] Among them, the second elastic member 322 includes but is not limited to springs.

[0088] Further, in some embodiments of the present application, as Figures 7 to 11 shown, a first inclined surface 314 may be provided on the outer peripheral side of the locking assembly 31, and a second inclined surface 3211 is provided on the inner wall of the extrusion sleeve 321. The first inclined surface 314 contacts the second inclined surface 3211, where the height dimension of the second inclined surface 3211 may be greater than or equal to the height dimension of the first inclined surface 314, so that when the locking assembly 31 is in the extruded and released states, the first inclined surface 314 and the second inclined surface 3211 remain in contact, thereby limiting the radial direction of the locking assembly 31 and preventing the first inclined surface 314 and the second inclined surface 3211 from separating during the deformation of the locking assembly 31.

[0089] Among them, as Figure 7 and Figure 11As shown, a ring groove 3212 for accommodating the upper end of the locking component 31 can be provided at the bottom of the extrusion sleeve 321. The shape of the ring groove 3212 is adapted to the shape of the upper end of the locking component 31. The second inclined surface 3211 is located at the lower end of the ring groove 3212. When the extrusion sleeve 321 slides down to squeeze the locking component 31, the upper end of the locking component 31 can slide along the second inclined surface 3211 into the ring groove 3212. At this time, the inner peripheral wall of the ring groove 3212 can be abutted against the outer peripheral surface of the locking component 31, so as to radially limit the locking component 31 and further improve the locking force.

[0090] It should be noted that in this article, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0091] In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above examples is only used to help understand the method and its core idea of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that due to the limitation of literal expression and objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements, refinements or changes can be made, and the above technical features can also be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the present invention to other occasions without improvement, shall all be regarded as the protection scope of the present invention.

Claims

1. A force-multiplying mechanical locking cylinder, characterized in that, Comprising: A cylinder block (10) in which a piston rod (50) is movably inserted, and an air inlet communicating with the inner cavity of the cylinder block (10) is provided on the side wall; A piston assembly (20) disposed in the inner cavity of the cylinder block (10) and connected to the piston rod (50). The piston assembly (20) includes a first piston (21) and a second piston (22) sequentially distributed in the height direction. An air flow channel is provided on the piston assembly (20). When air flow is introduced into the cylinder block (10), the air flow can be split through the air flow channel to the surfaces of the first piston (21) and the second piston (22) to drive the piston assembly (20) to drive the piston rod (50) to move in the height direction of the cylinder block (10); A locking device (30) disposed in the inner cavity of the cylinder block (10). The locking device (30) is sleeved outside the piston rod (50) and is used to lock and fix the piston rod (50) after the piston rod (50) moves to the working position.

2. The power-boost type mechanical locking cylinder according to claim 1, wherein The air flow channel includes: A first air flow channel (23) communicating the first lower surface (211) of the first piston (21) with the second lower surface (221) of the second piston (22) to guide the air flow introduced into the lower part of the inner cavity of the cylinder block (10) to the second lower surface (221) of the second piston (22); A second air flow channel (24) communicating the second upper surface (222) of the second piston (22) with the first upper surface (212) of the first piston (21) to guide the air flow introduced into the upper part of the inner cavity of the cylinder block (10) to the first upper surface (212) of the first piston (21).

3. The power-boost type mechanical locking cylinder according to claim 2, wherein The first air flow channel (23) includes a first inlet channel (231) and a first outlet channel (232) connected in sequence. The inlet end of the first inlet channel (231) penetrates the first lower surface (211) of the first piston (21), and the outlet end of the first outlet channel (232) is close to the second lower surface (221) of the second piston (22); and / or The second air flow channel (24) includes a second inlet channel (241) and a second outlet channel (242) connected in sequence. The inlet end of the second inlet channel (241) penetrates the second upper surface (222) of the second piston (22), and the outlet end of the second outlet channel (242) is close to the first upper surface (212) of the first piston (21).

4. The force-multiplying mechanical locking type cylinder according to claim 3, characterized in that, The piston assembly (20) is connected to the bottom of the piston rod (50) by a screw (60); A first inlet channel (231) is formed between the outer peripheral wall of the screw (60) and the inner peripheral wall of the piston assembly (20).

5. The power-amplified mechanical locking cylinder according to any one of claims 2 to 4, characterized in that The cylinder body (10) comprises a first chamber (11) and a second chamber (12) which are sequentially distributed in a height direction and communicate with each other, and the air inlet comprises a first vent hole (13) and a second vent hole (14) which are opened on the side wall of the cylinder body (10), wherein the first vent hole (13) communicates with the bottom of the first chamber (11), and the second vent hole (14) communicates with the bottom of the second chamber (12) and / or the top of the first chamber (11); The piston assembly (20) is arranged in the first chamber (11), and the locking device (30) is arranged in the second chamber (12).

6. The power-boost type mechanical locking cylinder according to claim 5, wherein The piston rod (50) is provided with a flow channel (51) communicating with the second chamber (12) and the second air flow channel (24).

7. The power-boost type mechanical locking cylinder according to any one of claims 1 to 4, characterized in that The piston rod (50) is provided with a first locking portion (52); The locking device (30) comprises: A locking assembly (31) is arranged in the cylinder body (10) and sleeved on the outside of the piston rod (50), and a second locking portion (311) is provided on the locking assembly (31); An extrusion assembly (32) is arranged in the cylinder body (10) and sleeved on the outside of the locking assembly (31). The extrusion assembly (32) is slidably arranged along the axial direction of the cylinder body (10) to squeeze or release the locking assembly (31), so that the second locking portion (311) contacts or separates from the first locking portion (52) to lock or release the piston rod (50).

8. The force-multiplying mechanical locking cylinder according to claim 7, wherein The first locking portion (52) includes a recessed portion (521) recessed inwardly on the outer peripheral side of the piston rod (50), and a first locking inclined surface (522) is formed on the recessed portion (521); The second locking portion (311) comprises a locking space (3111) of variable size, an inner wall of the locking space (3111) is formed with a second locking inclined surface (3112), and the piston rod (50) passes through the locking space (3111); When the piston rod (50) is in a locked state, the locking space (3111) is clamped in the recess (521), and the second locking inclined surface (3112) abuts against the first locking inclined surface (522).

9. The force-multiplying mechanical locking type cylinder according to claim 7, wherein, The locking assembly (31) comprises: At least two locking members (310) connected end to end; A first elastic member (320) is connected between at least two locking members (310). The first elastic member (320) is used to elastically deform when the locking assembly (31) is subjected to an external force, and to reset when the external force disappears, thereby allowing at least two locking members (310) to move closer to or farther from each other to adjust the size of the locking assembly (31).

10. The multi-force mechanical locking type cylinder according to claim 7, characterized in that, The extrusion assembly (32) includes: An extrusion sleeve (321) is sleeved on the outside of the locking assembly (31) and is capable of sliding in the cylinder (10) along an axial direction; The second elastic member (322) has one end connected to the top wall of the cylinder body (10) and the other end connected to the end of the extrusion sleeve (321) facing away from the locking assembly (31).

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