WO2023159905A1 - Rod head connecting assembly, hydraulic cylinder, and operation machine - Google Patents

Abstract

A rod head connecting assembly, a hydraulic cylinder, and an operation machine. The rod head connecting assembly comprises: a rod head body (100), a rod head flange (200), and an oil pipe (301). The rod head body (100) is provided with a first oil port (101) and a second oil port (102), respectively. The rod head flange (200) is provided with a central mounting hole (201) and a plurality of edge oil passing through holes (202). The rod head body (100) is connected to the rod head flange (200), and an oil cavity (302) is provided between the rod head body (100) and the rod head flange (200). The first oil port (101) is communicated with the edge oil passing through holes (202) by means of the oil cavity (302). One end of the oil pipe (301) passes through the central mounting hole (201) and is communicated with the second oil port (102). This configuration can increase the oil passing quantities of a rod cavity and a rodless cavity (408). Therefore, the reaction speed of the hydraulic cylinder is greatly increased.

Description

Rod head connection components, hydraulic cylinders and working machinery

Cross References to Related Applications

This application claims the priority of the Chinese patent application with the application number 202220422298.5 and titled "Rod Head Connection Assembly, Hydraulic Cylinder, and Working Machinery" filed on February 28, 2022, which is fully incorporated herein by reference.

technical field

The present application relates to the technical field of hydraulic cylinders, in particular to a rod head connection assembly, a hydraulic cylinder and an operating machine.

Background technique

As an actuator, the multi-stage hydraulic cylinder can assist the operation machine to complete operations such as upright and upright. The setting method of the oil inlet and outlet of the multi-stage hydraulic cylinder directly affects its working state. At present, the common multi-stage hydraulic cylinder usually sets the oil inlet and outlet ports of the rod chamber and the rodless chamber on the rod head, and an oil pipe is added in the piston rod body to separate the hydraulic oil entering and leaving the two oil ports. At the same time, the rod head and the piston rod body are welded or threaded. In the multi-stage hydraulic cylinder of this structure, the outer diameter of the connecting end of the rod head is less than or equal to the outer diameter of the piston rod rod. The diameter of the oil passage between the rods is smaller, and the response speed of the hydraulic cylinder is slower.

Contents of the invention

The application provides a rod head connection assembly, a hydraulic cylinder and a working machine, which are used to solve the problems of the small diameter of the oil passage between the rod head and the piston rod and the slow response speed of the hydraulic cylinder, and realize the enlargement of the rod head and the piston rod. The size of the oil passage between them improves the response speed of the hydraulic cylinder.

According to the first aspect of the present application, there is provided a rod head connection assembly, including: a rod head body, a rod head flange and an oil pipe.

Wherein, a first oil port and a second oil port are respectively opened on the rod head body. A center mounting hole and a plurality of edge oil passage holes are opened on the rod head flange. The rod head body is connected to the rod head flange, and an oil chamber is arranged between the rod head body and the rod head flange. The first oil port communicates with each of the edge oil through holes through the oil cavity. One end of the oil pipe passes through the central mounting hole and communicates with the second oil port.

According to a rod head connection assembly provided in the present application, the plurality of edge oil through holes are evenly arrayed to the outside of the central mounting hole with the central axis of the central mounting hole as a center line.

According to a rod head connection assembly provided in the present application, a first sealing device is provided at the connecting end of the oil pipe and the second oil port.

According to the second aspect of the present application, a hydraulic cylinder is provided, including a cylinder barrel assembly, a rod body assembly, and the above-mentioned rod head connection assembly.

Wherein, the rod assembly includes a central cavity. The cylinder assembly includes a rod chamber and a rodless chamber. The rod head flange is connected with the rod body assembly. Each edge communicates with the central cavity through an oil through hole. The central cavity communicates with the rod cavity. The other end of the oil pipe communicates with the rodless chamber.

According to a hydraulic cylinder provided by the present application, the rod assembly includes a rod body, a rod tail assembly and a piston. The inner end of the rod body is connected with the rod tail assembly. The outer end of the rod body is connected to the rod head flange. The piston is sleeved on the outside of the rod tail assembly. The center cavity is formed inside the rod body. Each edge communicates with the central cavity through an oil through hole. A plurality of first oil passages are opened on the rod tail assembly. The central cavity communicates with the rod cavity through the first oil passage.

The oil pipe is arranged in the central cavity. One end of the oil pipe passes through the central mounting hole and communicates with the second oil port, and the other end of the oil pipe passes through the rod tail assembly and communicates with the rodless chamber.

According to a hydraulic cylinder provided by the present application, the cylinder assembly includes a first inner cylinder, a second inner cylinder and a cylinder assembly. The cylinder assembly includes an outer cylinder and a fixed rod head. The fixed rod head is closed and fixedly connected to one end of the outer cylinder, and the rod head connection assembly is located at the other end of the outer cylinder.

The first inner cylinder is sleeved on the outside of the rod body assembly; the second inner cylinder is sleeved on the outside of the first inner cylinder; the outer cylinder is sleeved on the second inner cylinder outside of the cylinder.

The rod cavity includes a first rod cavity, a second rod cavity and a third rod cavity. The first rod chamber is arranged between the first inner cylinder and the rod body; the second rod chamber is arranged between the second inner cylinder and the first inner cylinder; The third rod chamber is disposed between the outer cylinder and the second inner cylinder.

The first rod cavity communicates with the central cavity through the first oil passage. A second oil passage is opened on the first inner cylinder, and the second rod chamber communicates with the first rod chamber through the second oil passage. A third oil passage is opened on the second inner cylinder, and the third rod chamber communicates with the rodless chamber through the third oil passage.

According to a hydraulic cylinder provided in the present application, a first guiding and limiting sleeve is arranged between the outer cylinder and the second inner cylinder. The first guiding and limiting sleeve is fixedly connected to the opening end of the outer cylinder, and the second inner cylinder slides through the first guiding and limiting sleeve. The inner end of the second inner cylinder is provided with a first limiting boss matched with the first guide limiting sleeve. The first limiting boss can be locked on the inner end of the first guiding and limiting sleeve.

A second guiding and limiting sleeve is arranged between the second inner cylinder and the first inner cylinder. The second guiding and limiting sleeve is fixedly connected to the opening end of the second inner cylinder, and the first inner cylinder slides through the second guiding and limiting sleeve. The inner end of the first inner cylinder is provided with a second limiting boss matched with the second guide limiting sleeve. The second limiting boss can be locked in the inner end of the second guiding and limiting sleeve.

A third guiding and limiting sleeve is arranged between the first inner cylinder and the rod body. The third guiding and limiting sleeve is fixedly connected to the opening end of the first inner cylinder, and the rod body slides through the third guiding and limiting sleeve. The inner end of the rod body is provided with a third limiting boss matched with the third guide limiting sleeve. The third limiting boss can be locked on the inner end of the third guiding and limiting sleeve.

According to a hydraulic cylinder provided by the present application, between the first guide and limit sleeve and the second inner cylinder, between the second guide and limit sleeve and the first inner cylinder, and the A second sealing device is also provided between the third guiding and limiting sleeve and the rod body.

According to a hydraulic cylinder provided by the present application, the rod head flange is welded to the outer end of the rod body. The rod head body and the rod head flange are connected by bolts.

According to a third aspect of the present application, a working machine is provided, including the above-mentioned rod head connection assembly or hydraulic cylinder.

In the rod head connection assembly provided in the present application, the rod head body is respectively provided with a first oil port and a second oil port. A center mounting hole and a plurality of edge oil passage holes are opened on the rod head flange. The rod head body is connected to the rod head flange, and an oil chamber is arranged between the rod head body and the rod head flange. The first oil port communicates with each of the edge oil through holes through the oil cavity. One end of the oil pipe passes through the central mounting hole and communicates with the second oil port.

With this structural arrangement, the first oil port on the rod head body communicates with each edge oil through hole through the oil chamber. The second oil port on the rod head body communicates with the oil pipe.

When in use, the rod head flange is connected with the rod body. The first oil port communicates with the rod cavity of the hydraulic cylinder through a plurality of edge oil through holes, so as to increase the oil flow through the rod cavity. The second oil port communicates with the rodless chamber of the hydraulic cylinder through the oil pipe, which can increase the size of the center mounting hole and the oil pipe to increase the oil flow through the rodless chamber.

Therefore, the rod head connection assembly can increase the oil flow through the rod chamber and the rodless chamber, thereby greatly improving the response speed of the hydraulic cylinder.

Further, in the hydraulic cylinder provided by the present application, since the hydraulic cylinder includes the above-mentioned rod head connection assembly, it also has the above-mentioned various advantages.

Furthermore, in the working machine provided by the present application, since the working machine includes the rod head connection assembly or the hydraulic cylinder as described above, it also has the above-mentioned various advantages.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present application, those of ordinary skill in the art can also obtain other drawings based on these drawings without creative effort.

Fig. 1 is the structural representation of the hydraulic cylinder provided by the present application;

Fig. 2 is a schematic structural view of the rod head flange and the rod body assembly in the hydraulic cylinder provided by the present application;

Fig. 3 is a schematic structural view of the rod head flange in the rod head connection assembly provided by the present application;

Fig. 4 is a partial enlarged view of place A in Fig. 1;

Fig. 5 is a partial enlarged view of B in Fig. 1 .

Reference signs:

100: rod head body; 101: first oil port;

102: Second oil port; 200: Rod head flange;

201: center mounting hole; 202: edge oil through hole;

203: Bolt connection hole; 301: Oil pipe;

302: oil chamber; 303: first sealing device;

400: cylinder assembly; 401: first inner cylinder;

402: second inner cylinder; 403: outer cylinder;

404: Fixed rod head; 405: The first rod cavity;

406: the second rod cavity; 407: the third rod cavity;

408: rodless chamber; 409: second oil passage;

410: The third oil passage; 500: Rod assembly;

501: rod body; 502: rod tail assembly;

503 piston; 504: central cavity;

505: The first oil passage; 601: The first guide limit sleeve;

602: the first limit boss; 603: the second guide limit sleeve;

604: the second limit boss; 605: the third guide limit sleeve;

606: the third limiting boss.

Detailed ways

The implementation manner of the present application will be further described in detail below with reference to the drawings and embodiments. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right" , "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this The application embodiments and simplified descriptions do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the application. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the embodiments of this application, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrated connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application in specific situations.

In the embodiment of the present application, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature may pass through the middle of the second feature. Media indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the level of the first feature is higher than that of the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of different embodiments or examples described in this specification to make the purposes and technical solutions of the embodiments of the present application and advantages are clearer. The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. the embodiment. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

A rod head connection assembly, a hydraulic cylinder and a working machine provided in the embodiments of the present application will be described below with reference to FIGS. 1 to 5 . It should be understood that the following descriptions are only exemplary embodiments of the present application, and do not constitute any special limitation to the present application.

The embodiment of the first aspect of the present application provides a club head connection assembly. As shown in FIGS.

Wherein, a first oil port 101 and a second oil port 102 are respectively opened on the head body 100 . The rod head flange 200 is provided with a central installation hole 201 and a plurality of edge oil passage holes 202 . The head body 100 is connected to the head flange 200 . Furthermore, an oil chamber 302 is provided between the rod head body 100 and the rod head flange 200 . The first oil port 101 communicates with each edge oil through hole 202 through the oil cavity 302 . One end of the oil pipe 301 passes through the central installation hole 201 and communicates with the second oil port 102 .

With this structural arrangement, the first oil port 101 on the rod head body 100 communicates with each edge oil through hole 202 through the oil cavity 302 . The second oil port 102 on the head body 100 communicates with the oil pipe 301 . In use, the head flange 200 is connected to the head body 100 . The first oil port 101 communicates with the rod chamber of the hydraulic cylinder through a plurality of edge oil passage holes 202 to increase the oil flow through the rod chamber. The second oil port 102 communicates with the rodless chamber 408 of the hydraulic cylinder through the oil pipe 301 , and the size of the central mounting hole 201 and the oil pipe 301 can be increased to increase the oil flow through the rodless chamber 408 . Therefore, the rod head connection assembly can increase the oil flow through the rod chamber and the rodless chamber 408, thereby greatly improving the response speed of the hydraulic cylinder.

In one embodiment of the present application, a plurality of edge oil passage holes 202 are evenly arrayed to the outside of the central installation hole 201 with the central axis of the central installation hole 201 as the center line.

As shown in FIG. 3 , the central mounting hole 201 is located at the central axis of the rod head flange 200 . There are a plurality of edge oil passage holes 202 in a uniform array on the outside of the central mounting hole 201 . Therefore, when the diameter of the central mounting hole 201 is increased, not only can the oil flow through the rodless chamber 408 of the hydraulic cylinder be increased, but also the strength of the rod head flange 200 can be ensured to be weakened as little as possible. At the same time, by arranging the edge oil through holes 202 evenly to the outside of the central mounting hole 201 , not only can the amount of oil passing through the rod cavity of the hydraulic cylinder be increased, but also the stress uniformity of the lifting rod head flange 200 can be achieved.

It should be noted here that this application does not make any limitation on the number of edge oil through holes 202 . For example, as shown in FIG. 3 , in one embodiment of the present application, the number of edge oil passage holes 202 is four.

In one embodiment of the present application, a first sealing device 303 is provided at the connecting end of the oil pipe 301 and the second oil port 102 .

For example, as shown in FIG. 4 , one end of the oil pipe 301 passes through the central installation hole 201 and the oil cavity 302 , and extends to the inside of the rod head flange 200 to communicate with the second oil port 102 . By installing the first sealing device 303 at the connection end between the oil pipe 301 and the second oil port 102, it is possible to prevent the second oil port 102 from communicating with the oil chamber 302, thereby preventing the second oil port 102 communicating with the rodless chamber 408 from It communicates with the first oil port 101 which communicates with the rod cavity, thereby ensuring the working accuracy of the hydraulic cylinder.

The embodiment of the second aspect of the present application provides a hydraulic cylinder, including a cylinder assembly 400 , a rod body assembly 500 and the above-mentioned rod head connection assembly.

Wherein, the rod assembly 500 includes a central cavity 504 . The cylinder assembly 400 includes a rod chamber and a rodless chamber 408 . The rod head flange 200 is connected with the rod body assembly 500 . Each edge communicates with the central cavity 504 through the oil through hole 202 . The central cavity 504 communicates with the rod cavity. The other end of the oil pipe 301 communicates with the rodless cavity 408 .

In the hydraulic cylinder provided by the present application, since the hydraulic cylinder includes the above-mentioned rod head connection assembly, it also has the above-mentioned various advantages.

Further, in one embodiment of the present application, the rod body assembly 500 includes a rod body 501 , a rod tail assembly 502 and a piston 503 . The inner end of the rod body 501 is connected with the rod tail assembly 502 . The outer end of the rod body 501 is connected to the rod head flange 200 . The piston 503 is sleeved on the outside of the rod tail assembly 502 . A central cavity 504 is formed inside the rod body 501 . Each edge communicates with the central cavity 504 through the oil through hole 202 . A plurality of first oil passages 505 are opened on the rod tail assembly 502 . The central cavity 504 communicates with the rod cavity through the first oil passage 505 .

The oil pipe 301 is disposed in the central cavity 504 . One end of the oil pipe 301 passes through the rod head flange 200 and communicates with the second oil port 102 . The other end of the oil pipe 301 communicates with the rodless cavity 408 through the rod tail assembly 502 .

For example, as shown in FIG. 1 , FIG. 2 and FIG. 4 , a central cavity 504 is provided in the direction of the central axis of the rod body 501 . The oil pipe 301 passes through the central cavity 504 . One end of the oil pipe 301 passes through the central mounting hole 201 of the rod head flange 200 and communicates with the second oil port 102 . The oil pipe 301 can be fixed with the central mounting hole 201 . The other end of the oil pipe 301 passes through the rod tail assembly 502 and extends into the rodless chamber 408 to communicate with the rodless chamber 408 . Each edge oil passage hole 202 communicates with the central cavity 504 . A plurality of first oil passages 505 are opened on the rod tail assembly 502 . The central cavity 504 communicates with the rod cavity through each first oil passage 505 .

During the working process, the hydraulic oil input through the first oil port 101 enters the central cavity 504 through the oil chamber 302 and the oil through holes 202 at each edge. The hydraulic oil in the central cavity 504 enters the rod cavity through the first oil passages 505 . The hydraulic oil in the rodless cavity 408 is discharged through the oil pipe 301 and the second oil port 102 . At this time, the rod body 501 of the hydraulic cylinder retracts. The hydraulic oil input through the second oil port 102 enters the rodless cavity 408 through the oil pipe 301 . The hydraulic oil in the rod cavity enters the central cavity 504 through the first oil passages 505 . The hydraulic oil in the central cavity 504 is discharged through the oil through hole 202 and the first oil port 101 on each edge. At this time, the rod body 501 of the hydraulic cylinder stretches out.

In one embodiment of the present application, as shown in FIG. 1 , FIG. 4 and FIG. 5 , the cylinder assembly 400 includes a first inner cylinder 401 , a second inner cylinder 402 and a cylinder assembly. The cylinder assembly includes an outer cylinder 403 and a fixed rod head 404 . The fixed rod head 404 is closed and fixedly connected to one end of the outer cylinder 403 . The rod head connection assembly is located at the other end of the outer cylinder 403 .

The first inner cylinder 401 is sleeved on the outside of the rod assembly 500 . The second inner cylinder 402 is sleeved on the outside of the first inner cylinder 401 . The outer cylinder 403 is sleeved on the outside of the second inner cylinder 402 .

The rod chambers include a first rod chamber 405 , a second rod chamber 406 and a third rod chamber 407 . The first rod cavity 405 is arranged between the first inner cylinder 401 and the rod body 501. The second rod chamber 406 is disposed between the second inner cylinder 402 and the first inner cylinder 401 . The third rod chamber 407 is disposed between the outer cylinder 403 and the second inner cylinder 402 .

The first rod cavity 405 communicates with the central cavity 504 through the first oil passage 505 . A second oil passage 409 is opened on the first inner cylinder 401 , and the second rod chamber 406 communicates with the first rod chamber 405 through the second oil passage 409 . A third oil passage 410 is opened on the second inner cylinder 402 , and the third rod chamber 407 communicates with the rodless chamber 408 through the third oil passage 410 .

Further, in one embodiment of the present application, as shown in FIG. 1 , FIG. 4 and FIG. 5 , a first guiding and limiting sleeve 601 is disposed between the outer cylinder 403 and the second inner cylinder 402 . The first guiding and limiting sleeve 601 is fixedly connected to the open end of the outer cylinder 403 . The second inner cylinder 402 slides through the first guiding and limiting sleeve 601 . The inner end of the second inner cylinder 402 is provided with a first limiting boss 602 matching with the first guide limiting sleeve 601 . The first limiting boss 602 can be locked on the inner end of the first guiding and limiting sleeve 601 .

A second guiding and limiting sleeve 603 is disposed between the second inner cylinder 402 and the first inner cylinder 401 . The second guiding and limiting sleeve 603 is fixedly connected to the open end of the second inner cylinder 402 . The first inner cylinder 401 slides through the second guiding and limiting sleeve 603 . The inner end of the first inner cylinder 401 is provided with a second limiting boss 604 matching with the second guide limiting sleeve 603 . The second limiting boss 604 can be engaged in the inner end of the second guiding limiting sleeve 603 .

A third guiding and limiting sleeve 605 is disposed between the first inner cylinder 401 and the rod body 501 . The third guiding and limiting sleeve 605 is fixedly connected to the opening end of the first inner cylinder 401 . The rod body 501 slides through the third guiding and limiting sleeve 605 . The inner end of the rod body 501 is provided with a third limiting boss 606 matching with the third guide limiting sleeve 605 . The third limiting boss 606 can be locked on the inner end of the third guide limiting sleeve 605 .

During the working process, when the hydraulic cylinder is extended, the hydraulic oil enters the rodless cavity 408 of the hydraulic cylinder through the second oil port 102 and the oil pipe 301 . Driven by the hydraulic oil in the rodless cavity 408 , the rod assembly 500 , the first inner cylinder 401 and the second inner cylinder 402 move outward simultaneously. When the first limiting boss 602 on the second inner cylinder 402 is engaged with the inner end of the first guide limiting sleeve 601 , the second inner cylinder 402 stops moving outward. Continue to feed hydraulic oil into the rodless chamber 408, under the action of the hydraulic oil in the rodless chamber 408, the rod assembly 500 and the first inner cylinder 401 move outward simultaneously, when the second inner cylinder 401 on the first inner cylinder 401 When the limiting boss 604 is locked on the inner end of the second guiding and limiting sleeve 603 , the first inner cylinder 401 stops moving outward. Continue to pass oil to the inside of the rodless chamber 408. Under the action of the hydraulic oil in the rodless chamber 408, the rod body assembly 500 moves outward. 605, the rod assembly 500 stops moving outward. When the rod assembly 500 , the first inner cylinder 401 and the second inner cylinder 402 extend outward, the hydraulic oil in the third rod chamber 407 enters the rodless chamber 408 through the third oil passage 410 . The hydraulic oil in the second rod chamber 406 enters the first rod chamber 405 through the second oil passage 409, and the hydraulic oil in the first rod chamber 405 enters the central chamber 504 through the first oil passages 505. . The hydraulic oil in the central cavity 504 is discharged through the oil through hole 202 and the first oil port 101 on each edge.

When the hydraulic cylinder shrinks, the hydraulic oil enters the central cavity 504 through the first oil port 101 and each edge oil through hole 202, and the hydraulic oil in the central cavity 504 enters the first active through the first oil passage 505. In the rod chamber 405 , part of the hydraulic oil in the rodless chamber 408 is discharged through the oil pipe 301 and the second oil port 102 . The rod body assembly 500 shrinks inward gradually to a limit position. Continue to feed hydraulic oil into the central cavity 504, the hydraulic oil in the first rod cavity 405 enters the second rod cavity 406 through the second oil passage 409, and part of the hydraulic oil in the rodless cavity 408 passes through the oil pipe 301 And the second oil port 102 discharges. The first inner cylinder 401 gradually expands inward to a limit position. Subsequently, the external force pushes the second inner cylinder 402 to shrink inward. At this time, part of the oil in the rodless cavity 408 enters the third rod cavity 407 through the third oil passage 410 . The remaining oil in the rodless cavity 408 is discharged through the oil pipe 301 and the second oil port 102 .

It should be understood here that the descriptions such as the inner side and the inner end in the above embodiments refer to directions away from the rod head flange 200 ;

From the embodiments described above, it can be seen that during the entire operation of the hydraulic cylinder, the third rod chamber 407 communicates with the rodless chamber 408, so that the second inner cylinder 402 works in single action, that is, the second inner cylinder The barrel 402 can only be stretched out by itself and cannot be retracted by itself. When the second inner cylinder 402 needs to be contracted, it needs to be pushed back under the action of gravity or other external forces. Thereby, the contraction cushioning performance of the hydraulic cylinder can be improved. The first inner cylinder 401 and the rod assembly 500 can perform double-action work, that is, the first inner cylinder 401 and the rod assembly 500 can extend or contract by themselves.

In one embodiment of the present application, between the first guide limit sleeve 601 and the second inner cylinder 402, between the second guide limit sleeve 603 and the first inner cylinder 401, and between the third guide limit sleeve A second sealing device is also provided between 605 and the rod body 501 .

In addition, it should be explained here that, for the connection mode between the first guide limit sleeve 601 and the outer cylinder 403 , the connection mode between the second guide limit sleeve 603 and the second inner cylinder 402 , and the second The connection method between the three guide limit sleeves 605 and the first inner cylinder 401 is not limited in this application. For example, the first guide and limit sleeve 601, the second guide and limit sleeve 603 and the third guide and limit sleeve 605 can be connected to the outer cylinder 403, the second inner cylinder 402 and the first inner cylinder 401 with interference fit respectively. . It can also be between the first guide limit sleeve 601 and the outer cylinder 403, between the second guide limit sleeve 603 and the second inner cylinder 402, and between the third guide limit sleeve 605 and the first inner cylinder 401. Install the sealing ring between them.

In one embodiment of the present application, the rod head flange 200 is welded to the outer end of the rod body 501 . The head body 100 is connected to the head flange 200 by bolts.

For example, as shown in FIG. 3 , a plurality of bolt connection holes 203 are uniformly and spaced apart on the edge of the rod head flange 200 . The head flange 200 is connected to the head body 100 by a plurality of bolts.

It should be understood here that the above embodiment is only an exemplary embodiment of the present application, and does not constitute any limitation to the present application.

The embodiment of the third aspect of the present application provides a work machine, including the rod head connection assembly or the hydraulic cylinder as described above.

For example, in one embodiment of the present application, the above-mentioned working machinery includes a crane or an elevating fire truck and the like.

It should be noted here that the above embodiment is only an exemplary embodiment of the present application, and does not constitute any limitation to the present application. That is to say, the aforementioned working machines include but are not limited to cranes or elevating fire trucks.

Further, since the work machine includes the rod head connection assembly or the hydraulic cylinder as described above, it also has the above-mentioned various advantages.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims (10)

1. A rod head connection assembly, comprising: a rod head body, a rod head flange and an oil pipe,

   Wherein, a first oil port and a second oil port are opened on the rod head body respectively, a central mounting hole and a plurality of edge oil passage holes are opened on the rod head flange, and the rod head body and the The rod head flange is connected, and an oil chamber is arranged between the rod head body and the rod head flange, and the first oil port communicates with each of the edge oil passage holes through the oil chamber, and the One end of the oil pipe passes through the central installation hole and communicates with the second oil port.
2. The rod head connection assembly according to claim 1, wherein the plurality of edge oil passage holes are evenly arrayed to the outside of the central mounting hole with the central axis of the central mounting hole as a center line.
3. The rod head connection assembly according to claim 1, wherein a first sealing device is provided at the connecting end of the oil pipe and the second oil port.
4. A hydraulic cylinder, comprising a cylinder assembly, a rod assembly and the rod head connection assembly according to any one of claims 1 to 3,

   Wherein, the rod body assembly includes a central cavity, the cylinder assembly includes a rod cavity and a rodless cavity, the rod head flange is connected to the rod body assembly, and each of the edge oil passage holes is connected to the center cavity. The cavity communicates, the central cavity communicates with the rod cavity, and the other end of the oil pipe communicates with the rodless cavity.
5. The hydraulic cylinder according to claim 4, wherein the rod body assembly comprises a rod body, a rod tail assembly and a piston, the inner end of the rod body is connected to the rod tail assembly, and the outer end of the rod body is connected to the The rod head is flange-connected, the piston is sleeved on the outside of the rod tail assembly, the center cavity is formed inside the rod body, and each of the edges communicates with the center cavity through oil holes. A plurality of first oil passages are opened on the rod tail assembly, and the central cavity and the rod chamber communicate with each other through the first oil passages,

   The oil pipe is arranged in the central cavity, one end of the oil pipe passes through the central installation hole and communicates with the second oil port, and the other end of the oil pipe passes through the rod tail assembly and the rodless cavities connected.
6. The hydraulic cylinder of claim 5, wherein the cylinder assembly includes a first inner cylinder, a second inner cylinder, and a cylinder assembly including an outer cylinder and a fixed rod head, The fixed rod head is closed and fixedly connected to one end of the outer cylinder, and the rod head connection assembly is located at the other end of the outer cylinder,

   The first inner cylinder is sleeved on the outside of the rod assembly, the second inner cylinder is sleeved on the outside of the first inner cylinder, and the outer cylinder is sleeved on the second inner cylinder. the outside of the cylinder,

   The rod chamber includes a first rod chamber, a second rod chamber and a third rod chamber, the first rod chamber is arranged between the first inner cylinder and the rod body, and the first rod chamber is arranged between the first inner cylinder and the rod body. Two rod chambers are arranged between the second inner cylinder and the first inner cylinder, and the third rod chamber is arranged between the outer cylinder and the second inner cylinder,

   The first rod cavity communicates with the central cavity through the first oil passage, and a second oil passage is opened on the first inner cylinder, and the second rod cavity communicates with the central cavity through the first oil passage. Two oil passages communicate with the first rod chamber, and a third oil passage is opened on the second inner cylinder, and the third rod chamber communicates with the rodless chamber through the third oil passage. cavities connected.
7. The hydraulic cylinder according to claim 6, wherein a first guiding and limiting sleeve is arranged between the outer cylinder and the second inner cylinder, and the first guiding and limiting sleeve is fixedly connected to the outer cylinder. The opening end of the cylinder, the second inner cylinder slides through the first guide limit sleeve, and the inner end of the second inner cylinder is provided with a An adapted first limiting boss, the first limiting boss can be locked in the inner end of the first guiding and limiting sleeve;

   A second guide and limit sleeve is provided between the second inner cylinder and the first inner cylinder, and the second guide and limit sleeve is fixedly connected to the opening end of the second inner cylinder. The first inner cylinder slides through the second guide and limit sleeve, and the inner end of the first inner cylinder is provided with a second limit protrusion that is compatible with the second guide and limit sleeve. platform, the second limiting boss can be locked in the inner end of the second guiding and limiting sleeve;

   A third guiding and limiting sleeve is arranged between the first inner cylinder and the rod, the third guiding and limiting sleeve is fixedly connected to the opening end of the first inner cylinder, and the rod slides through In the third guide and limit sleeve, the inner end of the rod body is provided with a third limit boss that is compatible with the third guide and limit sleeve, and the third limit boss can be clamped at the inner end of the third guiding and limiting sleeve.
8. The hydraulic cylinder according to claim 7, wherein, between the first guide limit sleeve and the second inner cylinder, between the second guide limit sleeve and the first inner cylinder, And a second sealing device is also provided between the third guiding and limiting sleeve and the rod body.
9. The hydraulic cylinder according to claim 5, wherein the rod head flange is welded to the outer end of the rod body, and the rod head body and the rod head flange are connected by bolts.
10. An operating machine, comprising the rod head connection assembly according to any one of claims 1 to 3 or the hydraulic cylinder according to any one of claims 4 to 9.

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