External cylinder locking device, cylinder assembly and engineering machinery

Abstract

The application provides an external locking device of a cylinder, a cylinder assembly and an engineering machine. The external locking device of the cylinder comprises a cylinder body, a valve core and a piston rod joint. The cylinder body is connected with a front end cover of the cylinder, and a locking assembly is arranged on the cylinder body. The valve core is arranged in the cylinder body in an axial sliding mode. The piston rod joint and a piston rod of the cylinder are inserted into two ends of the cylinder body respectively. One end of the piston rod joint towards the piston rod abuts against the valve core. The piston rod is movably penetrated through the valve core and connected with the piston rod joint. When the cylinder is in a rod cavity or a rodless cavity, the piston rod joint pushes the valve core to move in the cylinder body, so that the locking assembly and the piston rod joint are locked or unlocked. The external locking device of the cylinder is additionally arranged on the front end cover of the cylinder. The locking or unlocking of the locking assembly arranged on the cylinder body and the piston rod joint can realize the locking or unlocking of the cylinder. The conventional cylinder does not need to be additionally processed, and the external locking device of the cylinder has high universality and low cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air cylinders, and particularly relates to an air cylinder external locking device, an air cylinder assembly and engineering machinery. BACKGROUND

[0002] With the improvement of mechanization, most of the current sanitation vehicles need to perform some key actions through air cylinders, such as lifting and self-adapting of a sweeping disc, lifting and self-adapting of a rolling sweeping or suction nozzle. However, due to the small molecules of gas, it is easy to leak. The air cylinders on some vehicles cannot continue to stretch the sweeping disc, the rolling sweeping or the suction nozzle after being parked for a long time due to the leakage of high-pressure gas. Therefore, some manufacturers use air cylinders with locks or air cylinders with locking to provide additional locking force. However, the conventional air cylinders with locking force usually need to be additionally machined and designed on the cylinder body or the piston rod of the air cylinder, so the cost is relatively high. Moreover, the installation distance of the locking air cylinder is longer than that of the conventional air cylinder, which cannot be interchanged with the existing air cylinder on the vehicle, and the structure of the main machine needs to be changed to adapt to the change of the size of the air cylinder, so the universality is poor. SUMMARY

[0003] The main purpose of the application is to provide an air cylinder external locking device, an air cylinder assembly and engineering machinery, which aims to solve the technical problems of poor universality and high cost of the air cylinder with locking function in the prior art.

[0004] In order to achieve the above-mentioned purpose, the application provides an air cylinder external locking device, which comprises:

[0005] a cylinder body connected with a front end cover of an air cylinder, wherein a locking assembly is arranged on the cylinder body;

[0006] a valve core arranged in the cylinder body and sliding along an axial direction; and

[0007] a piston rod joint, wherein the piston rod joint and a piston rod of the air cylinder are respectively inserted from two ends of the cylinder body, an end of the piston rod joint facing the piston rod abuts against the valve core, the piston rod is movably penetrated through the valve core and connected with the piston rod joint;

[0008] wherein the movement of the piston rod joint and the valve core in the cylinder body can trigger the locking or unlocking of the locking assembly.

[0009] In the embodiment of the application, a first cavity is formed in the cylinder body, the locking assembly comprises a locking piece arranged on an inner side wall of the first cavity, a matching piece matched with the locking piece is arranged on the piston rod joint, and the locking piece and the matching piece are locked or unlocked when the rod cavity or the rodless cavity of the air cylinder is filled with gas.

[0010] In the embodiment of the present application, the locking member is a locking steel ball, the cylinder is provided with a limiting hole, the locking steel ball is movably arranged in the limiting hole and at least partially extends into the first cavity from the bottom of the limiting hole, and the cooperating member is a receiving groove provided on the outer periphery of the piston rod joint. When the rodless cavity is supplied with air, part of the locking steel ball falls into the receiving groove. When the rod cavity is supplied with air, the valve core pushes the bottom of the locking steel ball out of the receiving groove.

[0011] In the embodiment of the present application, the locking assembly further comprises:

[0012] an outer end cover, one side of the outer end cover towards the cylinder is provided with a limiting protrusion abutting against the outer periphery of the cylinder, the front end of the limiting protrusion is arranged close to the limiting hole, the rear end of the outer periphery of the cylinder is provided with a limiting portion, and a first elastic member is arranged between the rear end of the limiting protrusion and the limiting portion in the axial direction; and

[0013] a driving member for driving the outer end cover to move axially on the cylinder so as to cover the top end of the limiting hole with the limiting protrusion or move the limiting protrusion away from the limiting hole.

[0014] In the embodiment of the present application, the outer peripheral wall of the cylinder is further provided with a first limiting ring, and the first limiting ring is located between the limiting hole and the driving member.

[0015] In the embodiment of the present application, the driving member is a linear driving member.

[0016] In the embodiment of the present application, the driving member is an air bag, the front end of the outer end cover abuts against the outer periphery of the air bag, and an air inlet of the air bag and a rodless cavity air inlet of the rodless cavity are in air flow communication.

[0017] In the embodiment of the present application, the piston rod joint comprises a rod body portion and a joint portion connected in sequence, the joint portion forms a plug-in cavity for the piston rod to be axially plugged in, and an end face of the joint portion forms a limiting face abutting against the valve core.

[0018] In the embodiment of the present application, the valve core has a second cavity for the piston rod to penetrate, the valve core comprises a first cylindrical portion and a second cylindrical portion, the second cylindrical portion is provided with a limiting groove for embedding a buffer pad, and a bottom face of the second cylindrical portion is an inclined face arranged in a gradually widened manner on both sides. When the locking assembly and the piston rod joint are locked, the inclined face and the limiting face are extruded and matched.

[0019] In the embodiment of the present application, the outer diameter of the first cylindrical portion is smaller than the outer diameter of the second cylindrical portion, the inner peripheral wall of the cylinder is formed with a locking snap ring, the locking snap ring extends in the radial direction and abuts against the outer peripheral wall of the first cylindrical portion, and the locking snap ring and the second cylindrical portion are provided with a second elastic member therebetween.

[0020] In the embodiment of the present application, the valve core is provided with a buffer pad at one end thereof towards the piston rod joint, the front end of the buffer pad forms a limiting notch, and the notch wall of the limiting notch and the groove wall of the limiting groove are limited to abut against each other.

[0021] In the embodiment of the present application, the outer peripheral wall of the first cylindrical portion is provided with a second limiting ring between the locking snap ring and the rear end portion of the first cylindrical portion.

[0022] In addition, in the embodiment of the present application, a cylinder assembly is also provided, comprising:

[0023] a cylinder;

[0024] an external air source, and an electromagnetic reversing valve provided on a connecting pipeline between the external air source and the cylinder; and

[0025] the cylinder external locking device according to the above.

[0026] Further, in the embodiment of the present application, an engineering machine is also provided, comprising the cylinder assembly according to the above.

[0027] Through the above technical solution, the cylinder external locking device provided by the embodiment of the present application has the following beneficial effects:

[0028] The cylinder body of the external locking device is connected with the front end cover of the cylinder, and a locking assembly is arranged on the cylinder body; the valve core of the external locking device is arranged in the cylinder body in an axial sliding manner; the piston rod joint and the piston rod of the cylinder are respectively inserted from two ends of the cylinder body, the piston rod joint is abutted against the valve core at one end thereof facing the piston rod, and the piston rod is movably penetrated through the valve core and connected with the piston rod joint; when the rod cavity of the cylinder is filled with air, the piston rod of the cylinder is retracted, the piston rod drives the piston rod joint to move and pushes the valve core to move backward in the cylinder body, and after the valve core moves to a preset position, the locking assembly and the piston rod joint are locked; when the rodless cavity of the cylinder is filled with air, the piston rod of the cylinder is extended, the piston rod drives the piston rod joint to move away from the valve core, so that the locking assembly and the piston rod joint are locked. The external locking device of the cylinder is additionally arranged on the front end cover of the cylinder, and the locking or unlocking of the locking assembly arranged on the cylinder body and the piston rod joint is used to realize the locking or unlocking function of the cylinder, without the need of additional processing of the conventional cylinder, so that the cylinder has high universality and low cost.

[0029] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0031] Figure 1 is a structural schematic view of the locking assembly and the piston rod joint in the unlocked state according to an embodiment of the present application;

[0032] Figure 2is a structural schematic diagram of the locking assembly and the piston rod joint in the locked state according to an embodiment of the present application;

[0033] Figure 3 is a partial sectional view of the external locking device of the cylinder according to the present application;

[0034] Figure 4 is a sectional view of the piston rod joint in the external locking device of the cylinder according to the present application;

[0035] Figure 5 is a sectional structural schematic diagram of the cylinder according to the present application.

[0036] Explanation of Reference Signs

[0037] DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0039] The external locking device of the cylinder, the cylinder assembly and the engineering machinery according to the present application are described below with reference to the accompanying drawings.

[0040] As shown in Figure 1 , Figure 2 and Figure 5 , in the embodiment of the present application, an external locking device of a cylinder is provided, which comprises a cylinder body 10, a valve core 20 and a piston rod joint 40; the cylinder body 10 is connected with a front end cover of a cylinder 60, and the cylinder body 10 is provided with a locking assembly; the valve core 20 is slidably arranged in the cylinder body 10 in the axial direction; the piston rod joint 40 and a piston rod 50 of the cylinder 60 are respectively inserted from two ends of the cylinder body 10, the end of the piston rod joint 40 facing the piston rod 50 abuts against the valve core 20, the piston rod 50 movably penetrates the valve core 20 and is connected with the piston rod joint 40; when the rod cavity of the cylinder 60 is supplied with air, the piston rod 50 of the cylinder 60 is retracted, the piston rod 50 drives the piston rod joint 40 to move and pushes the valve core 20 to move backward in the cylinder body 10, after moving to a preset position, the locking assembly and the piston rod joint 40 are locked; when the rodless cavity of the cylinder 60 is supplied with air, the piston rod 50 of the cylinder 60 is extended, the piston rod 50 drives the piston rod joint 40 to move away from the valve core 20, so that the locking assembly and the piston rod joint 40 are locked.

[0041] The application is to utilize the idle space between the front end cover of the cylinder 60 and the piston rod joint 40, to realize the locking of the cylinder 60 through the external locking cylinder body 10 and the special shape of the piston rod joint 40, which can be applied to all general cylinders 60, is convenient and simple, does not need to change the size of the cylinder 60, has low cost, and does not cause additional damage to the cylinder body 10 or the piston rod 50 of the cylinder 60. The locking force of the cylinder 60 is provided by the piston rod joint 40 of the cylinder 60 and the additional locking assembly. When the piston rod 50 of the cylinder 60 is retracted, the cylinder body 10 of the external locking device can also protect the piston rod 50.

[0042] It should be noted that the front end cover of the cylinder 60 has many forms, and the most mainstream form is to lock the front end cover and the cylinder body 10 by four bolts, so the example of the present application uses such a cylinder 60 for illustration, and the remaining types of cylinders 60 have different front end cover connection modes, which will not be illustrated one by one. Specifically, the cylinder body 10 of the external locking device of the present application is connected with the front end cover of the cylinder 60 by four bolts to fix the cylinder body 10 on the front end cover of the cylinder 60, and the rod head of the piston rod 50 of the cylinder 60 is arranged in the cylinder body 10 and connected with the piston rod joint 40 through threads.

[0043] In addition, the locking device of the present application is arranged outside the cylinder 60, so it is easy to observe whether the unlocking is performed, which is convenient for troubleshooting and subsequent maintenance.

[0044] In the embodiment of the present application, the first cavity 11 is formed in the cylinder body 10, the locking assembly includes a locking piece arranged on the inner side wall of the first cavity 11, the piston rod joint 40 is provided with a matching piece matched with the locking piece, and the locking piece and the matching piece are locked or unlocked when the rod cavity or the rodless cavity of the cylinder 60 is inhaled. The locking mode of the locking piece and the matching piece has many forms, such as hooks and extrusion, as long as the locking piece and the matching piece can be matched to realize locking.

[0045] In the preferred embodiment, the locking piece is set as a locking steel ball 32, the cylinder body 10 is provided with a limiting hole 14, the locking steel ball 32 is movably arranged in the limiting hole 14 and at least part of the locking steel ball 32 can extend from the bottom of the limiting hole 14 to the first cavity 11, and the matching piece is a containing groove 422 arranged on the outer periphery of the piston rod joint 40. When the rod cavity inhales, part of the locking steel ball 32 falls into the containing groove 422, when the rodless cavity inhales, the valve core 20 pushes the bottom of the locking steel ball 32 to discharge from the containing groove 422, the valve core 20 moves to the bottom of the limiting hole 14 again and is closed, so that the locking steel ball 32 completely enters the limiting hole 14.

[0046] In order to realize that the locking steel ball 32 can freely ascend and descend in the limiting hole 14 and the bottom part is exposed outside the limiting hole 14, the shape of the limiting hole 14 is specially improved; specifically, the limiting hole 14 comprises a cylindrical hole and a conical hole which are communicated in sequence, the conical hole is arranged close to the direction of the first cavity 11, the inner diameter of the cylindrical hole is greater than the diameter of the locking steel ball 32, the maximum inner diameter of the conical hole is greater than the diameter of the locking steel ball 32, the minimum inner diameter is greater than the radius of the locking steel ball 32 and less than the diameter of the locking steel ball 32, so that when the rod cavity is inhaled, the piston rod joint 40 drives the valve core 20 to move backward under the driving of the piston rod 50, the valve core 20 cancels the block of the bottom of the limiting hole 14, so that the bottom of the locking steel ball 32 is exposed from the conical hole and falls into the containing groove 422 of the piston rod joint 40, thereby realizing the locking of the piston rod joint 40 and the cylinder body 10; when the rod cavity is inhaled, the piston rod joint 40 moves forward, so that the valve core 20 returns to the original position and pushes the bottom of the locking steel ball 32 to move upward from the first cavity 11, realizing the separation of the locking steel ball 32 and the containing groove 422, and thereby realizing the unlocking of the piston rod joint 40 and the cylinder body 10.

[0047] When the rod cavity is inhaled, in order to facilitate the discharge of the locking steel ball 32 from the containing groove 422, the cross section of the containing groove 422 is set as a trapezoidal structure, so that the cross section of the two side groove walls of the containing groove 422 is inclined, when the piston rod joint 40 moves forward, the locking steel ball 32 can move along the inclined groove wall under the action of the forward pushing force until it is separated from the containing groove 422 and enters the limiting hole 14.

[0048] Further, as shown in Figure 3 , the locking assembly further comprises an outer end cover 33 arranged on the outer periphery of the cylinder body 10 and a driving member; wherein the side of the outer end cover 33 facing the cylinder body 10 has a limiting protrusion 331 abutting with the outer periphery of the cylinder body 10, the front end of the limiting protrusion 331 is arranged close to the limiting hole 14, the rear end of the outer periphery of the cylinder body 10 has a limiting part 15, a first elastic member 332 with elastic compression deformation is arranged between the rear end of the limiting protrusion 331 and the limiting part 15 in the axial direction; the driving member is used to drive the outer end cover 33 to move axially on the cylinder body 10, so that the limiting protrusion 331 covers the top end of the limiting hole 14 or moves away from the limiting hole 14.

[0049] Specifically, when the rod cavity is in the air intake state, the bottom part of the locking steel ball 32 falls into the accommodating groove 422, the first elastic member 332 exerts a forward acting thrust on the limiting protrusion 331 to push the outer end cover 33 to move forward, the limiting protrusion 331 covers the top end of the limiting hole 14, thereby preventing the locking steel ball 32 from sliding out of the limiting hole 14, and improving the locking effect. When the rod cavity is in the air intake state, the locking steel ball 32 is discharged from the accommodating groove 422 to the limiting hole 14, and the outer end cover 33 is pushed to move backward due to the inflation of the air bag 31, so that the limiting protrusion 331 is moved away from the top of the locking steel ball 32, and the valve core 20 exerts an upward thrust on the bottom of the locking steel ball 32, so that the locking steel ball 32 is pushed out of the limiting hole 14.

[0050] In the embodiment of the present application, the outer peripheral wall of the cylinder body 10 is further provided with a first limiting ring 13, which is located between the limiting hole 14 and the driving member, and is used to limit the position of the forward movement of the outer end cover 33.

[0051] Since the driving member is used to drive the outer end cover 33 to move linearly in the axial direction, the structure of the driving member can be various:

[0052] In one embodiment of the present application, the driving member is a linear driving member, which can be a small air cylinder 60 or an electric push rod, etc.

[0053] In another embodiment of the present application, the driving member is an air bag 31, the front end of the outer end cover 33 abuts against the outer periphery of the air bag 31, and the air bag inlet 311 of the air bag 31 and the rodless cavity inlet 61 of the rodless cavity are in airflow communication, so as to drive the movement of the front end cover through the inflation or deflation of the air bag.

[0054] Since in the prior art, the unlocking mode of the air cylinder 60 is completed inside the air cylinder 60 or in the clamping cylinder, and it cannot be seen from the outside whether it has been normally unlocked; while the unlocking mode of the present application is realized by the external air bag 31, which pushes the external outer end cover 33 to move when unlocking, and its action can be clearly seen, which is convenient for troubleshooting and subsequent maintenance.

[0055] In addition, the mounting box 34 is further provided on the outer periphery of the cylinder body 10 close to the front end, and the air bag 31 is mounted in the mounting box 34, and the mounting box 34 is provided with a avoiding opening on the side facing the outer end cover 33 for the inflation of the air bag 31.

[0056] For example, Figure 4As shown, the piston rod joint 40 comprises a rod body 41 and a joint 42 connected in sequence, a receiving groove 422 is formed on the outer periphery of the joint 42, the joint 42 forms a plug-in cavity 421 for the axial plug-in of the piston rod 50, and the piston rod 50 and the inner peripheral wall of the plug-in cavity 421 are threadedly connected, and the end face of the joint 42 forms a limiting surface 423 for abutting with the spool 20. The shape of the piston rod joint 40 is improved to cooperate with the locking steel ball 32 on the cylinder body 10 to achieve locking or unlocking, without damaging the cylinder 60 or the piston rod 50, and the overall cost is lower.

[0057] In the embodiment of the present application, the spool 20 has a second cavity 23 for the piston rod 50 to penetrate, and the spool 20 comprises a first cylindrical portion 21 and a second cylindrical portion 22 connected in sequence from back to front in the axial direction, the outer periphery of the first cylindrical portion 21 is spaced apart from the inner peripheral wall of the cylinder body 10, and the outer periphery of the second cylindrical portion 22 is in sliding fit with the inner peripheral wall of the cylinder body 10; the second cylindrical portion 22 is provided with a limiting groove for embedding the buffer pad 25, the bottom surface of the second cylindrical portion 22 is an inclined surface 221 which is gradually widened on both sides, and the shape of the inclined surface 221 is the same as that of the limiting surface 423, when the locking assembly and the piston rod joint 40 are locked, the piston rod joint 40 pushes the spool 20 to move, at this time, the inclined surface 221 and the limiting surface 423 are extruded and fitted.

[0058] In the embodiment of the present application, the outer diameter of the first cylindrical portion 21 is smaller than the outer diameter of the second cylindrical portion 22, the inner peripheral wall of the cylinder body 10 is formed with a locking snap ring 12, the locking snap ring 12 extends in the radial direction and abuts to the outer peripheral wall of the first cylindrical portion 21, and the locking snap ring 12 and the second cylindrical portion 22 have a second elastic member 24 therebetween. When the rod cavity is filled with air, the piston rod 50 drives the piston rod joint 40 to move backward, the piston rod joint 40 drives the spool 20 to move backward, and the second elastic member 24 plays a buffering role to prevent the moving speed from being too fast; when the rod cavity is not filled with air, the piston rod 50 drives the piston rod joint 40 to move forward, so that the piston rod joint 40 is separated from the spool 20, the second elastic member 24 restores the deformation, and exerts an elastic pushing force forward on the second cylindrical portion 22, thereby driving the entire spool 20 to move forward.

[0059] In order to prevent the end of the piston rod joint 40 from generating a pushing force on the spool 20 that is too large to damage the spool 20 when pushing the spool 20 to move, a buffer pad 25 is arranged at the end of the spool 20 facing the piston rod joint 40, the front end of the buffer pad 25 forms a limiting notch 251, the notch wall of the limiting notch 251 and the groove wall of the limiting groove are in limiting abutment, so that the entire buffer pad 25 can be clamped in the limiting groove of the spool 20 to prevent position change. The material of the buffer pad 25 can be a flexible material.

[0060] When air enters the rodless chamber, in order to prevent the valve core 20 from moving beyond the initial position, a second limiting ring 211 is provided on the outer peripheral wall of the first cylindrical part 21. The second limiting ring 211 is located between the locking ring 12 and the rear end of the first cylindrical part 21. The second limiting ring 211 limits the forward movement of the valve core 20. When the valve core 20 moves forward to the preset initial position, the locking ring 12 and the second limiting ring 211 stop and abut, thereby achieving the limiting.

[0061] Furthermore, in an embodiment of the present invention, a cylinder assembly is also provided, including a cylinder 60, an external air source 80, and an external cylinder locking device as described above; an electromagnetic reversing valve 70 is provided on the connecting pipeline between the external air source 80 and the cylinder 60. Wherein, for example... Figure 1 and Figure 2 As shown, the P port of the electromagnetic reversing valve 70 is the air inlet, the A port is connected to the rod chamber air inlet 62, and the B port is connected to the airbag air inlet 311 and the rodless chamber air inlet 61, respectively.

[0062] When air enters the rod chamber of cylinder 60, such as Figure 2 As shown, the piston rod 50 is in the retracted state. The piston rod joint 40 of the cylinder 60 pushes the valve core 20 to move backward, compressing the second elastic element 24. The locking steel ball 32 falls into the receiving groove 422 on the piston rod joint 40. At this time, the rodless chamber air inlet 61 and the air bag air inlet 311 are connected to the atmosphere through port B, and the pressure is 0. The outer end cover 33 moves forward under the push of the first elastic element 332, compressing the air bag 31 and covering the locking steel ball 32, thereby locking the entire cylinder 60.

[0063] When the piston rod 50 of cylinder 60 needs to extend, the solenoid directional valve 70 reverses, such as... Figure 1 As shown, high-pressure gas flows from port P to port B, and then through the airflow branch pipes to the airbag 31 of the external locking device and the rodless chamber of the cylinder 60. The airbag 31 expands, compressing the first elastic element 332 and pushing the outer end cover 33 to move backward, thus removing the outer end cover 33 from the top of the locking steel ball 32. At the same time, as the piston rod joint 40 moves away from the valve core 20, the valve core 20 moves forward under the elastic force of the second elastic element 24, pushing the locking steel ball 32 up, unlocking the piston rod joint 40 and the cylinder 10, thereby unlocking the cylinder 60. The piston rod 50 of the cylinder 60 extends under the drive of the high-pressure gas.

[0064] Furthermore, since the cylinder assembly employs all embodiments of the aforementioned external cylinder locking device, it possesses all the beneficial effects of the external cylinder locking device, which will not be elaborated upon here.

[0065] Further, in the embodiments of the present application, an engineering machine is also provided, which comprises the cylinder assembly as described above. Wherein, the engineering machine can be a sanitation vehicle, a garbage truck or the like, which needs to be driven linearly by the cylinder assembly, and is not limited here.

[0066] In the description of the present application, it needs to be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0067] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicated with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0069] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An external locking device for a cylinder, characterized in that The application relates to a cylinder (10) connected with a front end cover of a cylinder (60), wherein a locking assembly is arranged on the cylinder (10), a limiting hole (14) is arranged on the cylinder (10), and a first cavity (11) is formed in the cylinder (10); a valve core (20) is arranged in the cylinder (10) and slides along an axial direction; a piston rod joint (40) is inserted into the cylinder (10) from two ends of the cylinder (10) and is connected with a piston rod (50) of the cylinder (60), one end of the piston rod joint (40) abuts against the valve core (20), the piston rod (50) penetrates through the valve core (20) and is connected with the piston rod joint (40); the piston rod joint (40) drives the valve core (20) to move in the cylinder (10) and triggers the locking assembly to lock or unlock; the locking assembly comprises an outer end cover (33) arranged on the outer periphery of the cylinder (10), the outer end cover (33) is provided with a limiting protrusion (331) on one side of the cylinder (10) and abuts against the outer periphery of the cylinder (10), the front end of the limiting protrusion (331) is arranged close to the limiting hole (14), the rear end of the limiting protrusion (331) is provided with a first elastic element (332) along an axial direction between the limiting protrusion (331) and a limiting portion (15) of the outer periphery of the cylinder (10), and a driving element is arranged on the cylinder (10) and drives the outer end cover (33) to move along an axial direction so that the limiting protrusion (331) covers the top end of the limiting hole (14) or moves away from the limiting hole (14); the driving element is an air bag (31), the front end of the outer end cover (33) abuts against the outer periphery of the air bag (31), and an air bag inlet (311) of the air bag (31) and a rodless cavity inlet (61) of a rodless cavity are in airflow communication; the locking assembly further comprises a locking element arranged on the inner side wall of the first cavity (11), the piston rod joint (40) is provided with a matching element matched with the locking element, the locking element is a locking steel ball (32), the locking steel ball (32) is movably arranged in the limiting hole (14) and can be at least partially extended from the bottom of the limiting hole (14) into the first cavity (11), and the matching element is a containing groove (422) arranged on the outer periphery of the piston rod joint (40); when the rod cavity or the rodless cavity of the cylinder (60) is inhaled, the locking element and the matching element are locked or unlocked; the outer peripheral wall of the cylinder (10) is further provided with a first limiting ring (13), and the first limiting ring (13) is arranged between the limiting hole (14) and the driving element. ​ ​ ​ ​ ​ ​ ​ ​ 2. The external air cylinder locking device according to claim 1, wherein ​ 3. The external air cylinder locking device of claim 1, wherein ​ 4. The external air cylinder locking device according to any one of claims 1 to 3, characterized in that The piston rod joint (40) comprises a rod body (41) and a joint part (42) connected in sequence, the joint part (42) forms a joint cavity (421) for axial insertion of the piston rod (50), and an end face of the joint part (42) forms a limiting face (423) abutting with the spool (20).

5. The external air cylinder locking device according to claim 4, wherein The spool (20) has a second cavity (23) for penetration of the piston rod (50), the spool (20) comprises a first cylindrical part (21) and a second cylindrical part (22), the second cylindrical part (22) is provided with a limiting groove embedding the buffer pad (25), and a bottom face of the second cylindrical part (22) is an inclined face (221) gradually widened on both sides, and the inclined face (221) and the limiting face (423) are extruded and matched when the locking assembly and the piston rod joint (40) are locked.

6. The external air cylinder locking device according to claim 5, wherein An outer diameter of the first cylindrical part (21) is smaller than an outer diameter of the second cylindrical part (22), an inner circumferential wall of the cylinder body (10) is formed with a locking snap ring (12), the locking snap ring (12) extends in the radial direction and abuts to an outer circumferential wall of the first cylindrical part (21), and the locking snap ring (12) and the second cylindrical part (22) are provided with a second elastic member (24) therebetween.

7. The external air cylinder locking device of claim 5, wherein An end of the spool (20) towards the piston rod joint (40) is provided with a buffer pad (25), a front end of the buffer pad (25) forms a limiting notch (251), and a notch wall of the limiting notch (251) and a groove wall of the limiting groove are limited and abutted.

8. The external air cylinder locking device of claim 6, wherein, An outer circumferential wall of the first cylindrical part (21) is provided with a second limiting ring (211), and the second limiting ring (211) is located between the locking snap ring (12) and a rear end of the first cylindrical part (21).

9. A cylinder assembly characterized by, Comprise: a cylinder (60); an external air source (80), and an electromagnetic reversing valve (70) is arranged on a connecting pipeline between the external air source (80) and the cylinder (60); and the cylinder external locking device according to any one of claims 1 to 8.

10. A working machine, characterized in that comprise the cylinder assembly according to claim 9.

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