CN113816286B - Telescopic cylinder, crane boom and crane - Google Patents
Telescopic cylinder, crane boom and crane Download PDFInfo
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- CN113816286B CN113816286B CN202111129613.1A CN202111129613A CN113816286B CN 113816286 B CN113816286 B CN 113816286B CN 202111129613 A CN202111129613 A CN 202111129613A CN 113816286 B CN113816286 B CN 113816286B
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- cylinder
- rod
- cylinder body
- arm
- telescopic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/68—Jibs foldable or otherwise adjustable in configuration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
- Jib Cranes (AREA)
Abstract
The application relates to a telescopic cylinder, a crane boom and a crane, and relates to the technical field of engineering machinery, wherein the telescopic cylinder comprises a first cylinder body which is connected with a second section of boom; the second cylinder body is connected with the second section arm and connected with the first cylinder body; the first cylinder rod is connected with the first arm, penetrates through the first cylinder body and the second cylinder body, and the piston of the first cylinder rod slides in the first cylinder body; the second cylinder rod is penetrated through the second cylinder body, the second cylinder rod is sleeved outside the first cylinder rod in a sliding manner, and the piston of the second cylinder rod is configured to slide in the second cylinder body; wherein the inner diameter of the second cylinder body is larger than the inner diameter of the first cylinder body; the piston cross-sectional area of the second cylinder rod is greater than the piston cross-sectional area of the first cylinder rod. The telescopic cylinder, the crane boom and the crane can reduce the waste of the inner diameter of the telescopic cylinder, lighten the weight of the telescopic cylinder and reduce the use cost.
Description
Technical Field
The application relates to the technical field of engineering machinery, in particular to a telescopic cylinder, a crane boom and a crane.
Background
The telescopic cylinder in the crane can be used for adjusting the telescopic length of the crane boom, the telescopic structure of the crane boom belongs to a cantilever structure, and along with the extension length of the crane boom, the bearing capacity of the crane boom is gradually weakened, and the pressure born by the telescopic cylinder for driving the crane boom to extend is gradually reduced. Therefore, the compression force exerted by the telescopic cylinder is greatest when the boom extension is shortest.
In the prior art, in order to enable the telescopic cylinder to bear larger pressure, the inner diameter of the telescopic cylinder is set to be large, but after the crane boom is gradually stretched, the pressure born by the telescopic cylinder is smaller, so that the waste of the inner diameter of the telescopic cylinder is caused, the weight of the telescopic cylinder with larger inner diameter is also larger, the load is added to the crane boom, and the use cost is increased.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the application provides a telescopic cylinder, a crane boom and a crane, which can reduce the waste of the inner diameter of the telescopic cylinder, lighten the weight of the telescopic cylinder and reduce the use cost.
According to one aspect of the present application there is provided a telescopic cylinder for use with a boom, the boom comprising a first section of arm and a second section of arm, the telescopic cylinder comprising: a first cylinder configured to be connected to the second arm; a second cylinder configured to be connected to the second arm, and the second cylinder is connected to the first cylinder; the first cylinder rod is connected with the first arm, penetrates through the first cylinder body and the second cylinder body, and slides in the first cylinder body; the second cylinder rod is arranged in the second cylinder body in a penetrating manner, the second cylinder rod is sleeved outside the first cylinder rod in a sliding manner, and the piston of the second cylinder rod is configured to slide in the second cylinder body; wherein the inner diameter of the second cylinder body is larger than the inner diameter of the first cylinder body; the piston cross-sectional area of the second cylinder rod is greater than the piston cross-sectional area of the first cylinder rod.
According to the telescopic cylinder, the inner diameter of the second cylinder body is larger than that of the first cylinder body, and the piston cross section area of the second cylinder rod is larger than that of the first cylinder rod, so that the working pressure of the first cylinder body and the working pressure of the second cylinder body are larger under the condition that the extending length of the second section arm is driven to be shorter, the piston of the first cylinder rod and the piston of the second cylinder rod bear pressure together, the stress area is the superposition area of the piston cross section area of the first cylinder rod and the piston cross section area of the second cylinder rod, the pressure born by the piston of the first cylinder rod and the piston of the second cylinder rod can be reduced, and the requirement of the telescopic cylinder on bearing larger pressure is met, so that the bearing capacity of the telescopic cylinder is improved. In addition, compared with the condition that the inner diameter of the first cylinder body is increased to the inner diameter of the second cylinder body, the inner diameter of the first cylinder body is smaller than the inner diameter of the second cylinder body, and under the condition that the extending length of the second section arm is driven to be longer, the waste of the inner diameter of the first cylinder body can be reduced. And, the internal diameter of first cylinder body is less, and its overall dimension is less, and the weight is also corresponding less, therefore, with the condition of increasing the internal diameter of first cylinder body to the internal diameter of second cylinder body, the weight of first cylinder body and the weight of second cylinder body also correspond less, are favorable to reducing the load to the jib loading boom, reduce use cost.
According to another aspect of the application, the first cylinder is provided with a first rodless cavity and a first rod-bearing cavity, and the second cylinder is provided with a second rodless cavity and a second rod-bearing cavity; the telescopic cylinder further comprises: a first oil pipe configured to communicate the first rodless cavity with the second rodless cavity; and a second oil pipe configured to communicate the first rod-shaped cavity with the second rod-shaped cavity.
According to another aspect of the application, the maximum stroke length of the first rodless cavity is greater than the maximum stroke length of the second rodless cavity.
According to another aspect of the present application, the first cylinder rod is provided with a first oil passage penetrating the piston of the first cylinder rod to communicate with the first rodless chamber, and a second oil passage communicating with the first rod-shaped chamber.
According to another aspect of the application, the communication between the first oil pipe and the first rodless cavity is located at the top end of the first cylinder; the communication position of the first oil pipe and the second rodless cavity is positioned at the top end of the second cylinder body.
According to another aspect of the application, the communication between the second oil pipe and the first rod cavity is positioned at the bottom end of the first cylinder body; the communication position of the second oil pipe and the second rod cavity is positioned at the bottom end of the second cylinder body.
According to another aspect of the present application, the first cylinder rod, the second cylinder rod, the first cylinder body, and the second cylinder body are coaxially disposed.
According to another aspect of the application, the first cylinder is located above the second cylinder.
According to one aspect of the present application, there is also provided a boom comprising: a first arm; a second arm segment; and the first cylinder rod is connected with the first knuckle arm, and the first cylinder body and the second cylinder body are connected with the second knuckle arm.
According to the crane arm, the inner diameter of the second cylinder body is larger than the inner diameter of the first cylinder body, and the piston cross section of the second cylinder rod is larger than the piston cross section of the first cylinder rod, so that the telescopic cylinder can meet the requirement of larger pressure, waste of the inner diameter can be reduced under the condition of smaller pressure, in addition, the whole weight can be reduced, and the use cost is reduced.
According to an aspect of the present application, there is also provided a crane including: the first arm is connected to the body as described above.
According to the crane provided by the application, the inner diameter of the second cylinder body is larger than that of the first cylinder body, and the piston cross section area of the second cylinder rod is larger than that of the first cylinder rod, so that the working pressure of the first cylinder body and the working pressure of the second cylinder body are larger under the condition that the extension length of the second section arm is driven to be shorter, the piston of the first cylinder rod and the piston of the second cylinder rod bear pressure together, the stress area is the superposition area of the piston cross section area of the first cylinder rod and the piston cross section area of the second cylinder rod, the pressure born by the piston of the first cylinder rod and the piston of the second cylinder rod can be reduced, and the requirement of the telescopic cylinder on bearing larger pressure is met, so that the bearing capacity of the telescopic cylinder is improved. In addition, compared with the condition that the inner diameter of the first cylinder body is increased to the inner diameter of the second cylinder body, the inner diameter of the first cylinder body is smaller than the inner diameter of the second cylinder body, and under the condition that the extending length of the second section arm is driven to be longer, the waste of the inner diameter of the first cylinder body can be reduced. And, the internal diameter of first cylinder body is less, and its overall dimension is less, and the weight is also corresponding less, therefore, with the condition of increasing the internal diameter of first cylinder body to the internal diameter of second cylinder body, the weight of first cylinder body and the weight of second cylinder body also correspond less, are favorable to reducing the load to the jib loading boom, reduce use cost.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing embodiments of the present application in more detail with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.
Fig. 1 is a schematic structural view of a telescopic cylinder according to an exemplary embodiment of the present application.
Fig. 2 is a schematic structural view of a telescopic cylinder according to another embodiment of the present application.
Fig. 3 is a schematic structural view of a telescopic cylinder according to another embodiment of the present application.
Detailed Description
Hereinafter, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and it should be understood that the present application is not limited by the example embodiments described herein.
The embodiment of the application provides a crane, which can comprise a crane body and a crane arm, wherein the crane arm is connected with the crane body and can be lengthened or shortened to realize the lifting operation of goods.
In an embodiment, the crane arm may include a first arm, a second arm and a telescopic cylinder, where the first arm and the second arm are connected to the telescopic cylinder, and the second arm may move relative to the first arm under the driving action of the telescopic cylinder, where the second arm gradually extends or shortens to meet the demands of different working conditions.
In an embodiment, the crane arm may further include a third arm section and a fourth arm section, the third arm section is connected to the second arm section, the fourth arm section is connected to the third arm section, the second arm section may drive the third arm section to extend or shorten, and the third arm section may drive the fourth arm section to extend or shorten. In practical application, the number of the knuckle arms can be increased or decreased according to specific requirements, and the application does not limit the specific number of the knuckle arms.
Fig. 1 is a schematic structural view of a telescopic cylinder according to an exemplary embodiment of the present application. As shown in fig. 1, in an embodiment, the telescopic cylinder 1 may include a first cylinder body 11 and a second cylinder body 12, the first cylinder body 11 is connected with the second cylinder body 12, the second cylinder body 12 has an inner diameter larger than that of the first cylinder body 11, and a sectional area of a piston that the second cylinder body 12 may be used to accommodate is larger than that of the piston that the first cylinder body 11 may be used to accommodate.
As shown in fig. 1, in an embodiment, the telescopic cylinder 1 may further include a first cylinder rod 13, where the first cylinder rod 13 is disposed through the first cylinder body 11 and the second cylinder body 12, and a piston of the first cylinder rod 13 may slide in the first cylinder body 11. In this way, the hydraulic oil can be made to flow into the first cylinder 11 or flow out from the first cylinder 11 during the sliding of the piston of the first cylinder rod 13 in the first cylinder 11.
As shown in fig. 1, in an embodiment, the telescopic cylinder 1 may further include a second cylinder rod 14, where the second cylinder rod 14 is disposed through the second cylinder body 12, and a piston of the second cylinder rod 14 may slide in the second cylinder body 12. In this way, the hydraulic oil can be caused to flow into the second cylinder 12 or out of the second cylinder 12 during the sliding of the piston of the second cylinder rod 14 in the second cylinder 12.
As shown in fig. 1, in one embodiment, the second cylinder rod 14 is slidably sleeved outside the first cylinder rod 13. In this way, a two-stage expansion and contraction can be achieved between the first cylinder rod 13 and the second cylinder rod 14.
Fig. 2 is a schematic structural view of a telescopic cylinder according to another embodiment of the present application. Fig. 3 is a schematic structural view of a telescopic cylinder according to another embodiment of the present application. In practical application, the first cylinder rod 13 is fixedly connected to the first arm, and the first cylinder body 11 and the second cylinder body 12 are fixedly connected to the second arm. Taking the extension process of the telescopic cylinder 1 as an example, as shown in fig. 2, in the primary extension process, the first cylinder body 11 and the second cylinder body 12 slide relative to the first cylinder rod 13, and the whole length of the telescopic cylinder 1 is extended to drive the boom to extend. As shown in fig. 3, during the second-stage extension, the first cylinder 11, the second cylinder 12 and the second cylinder rod 14 slide on the first cylinder rod 13, and the whole length of the telescopic cylinder 1 is extended again, so that the crane boom is driven to be extended again.
In practical application, the telescopic structure of the crane arm belongs to a cantilever structure, and as the length of the crane arm increases, the bearing capacity of the crane arm gradually decreases, and the pressure born by the telescopic cylinder 1 driving the crane arm to extend gradually decreases. Therefore, the compression force exerted by the telescopic cylinder 1 is greatest when the boom extension is shortest.
As shown in fig. 1, in an embodiment, the inner diameter of the second cylinder body 12 is larger than the inner diameter of the first cylinder body 11, and the piston cross-sectional area of the second cylinder rod 14 is larger than the piston cross-sectional area of the first cylinder rod 13. In this way, under the condition that the length of the second section arm is driven to extend out is shorter, the working pressure of the first cylinder body 11 and the second cylinder body 12 is larger, the piston of the first cylinder rod 13 and the piston of the second cylinder rod 14 bear the pressure together, the stressed area is the overlapped area of the piston cross section area of the first cylinder rod 13 and the piston cross section area of the second cylinder rod 14, the pressure intensity born by the piston of the first cylinder rod 13 and the piston of the second cylinder rod 14 can be reduced, so that the requirement that the telescopic cylinder 1 bears larger pressure is met, and the bearing capacity of the telescopic cylinder 1 is improved.
In addition, compared with the case of increasing the inner diameter of the first cylinder 11 to the inner diameter of the second cylinder 12, the inner diameter of the first cylinder 11 is smaller than the inner diameter of the second cylinder 12 in the embodiment of the application, and the waste of the inner diameter of the first cylinder 11 can be reduced under the condition that the extension length of the second joint arm is driven to be longer. In addition, the inner diameter of the first cylinder 11 is smaller, the overall size is smaller, and the weight is correspondingly smaller, so that compared with the case of increasing the inner diameter of the first cylinder 11 to the inner diameter of the second cylinder 12, the weight of the first cylinder 11 and the weight of the second cylinder 12 are correspondingly smaller in the embodiment of the application, which is beneficial to reducing the load on the crane arm and reducing the use cost.
According to the telescopic cylinder 1, the crane arm and the crane, provided by the embodiment of the application, the inner diameter of the second cylinder body 12 is larger than the inner diameter of the first cylinder body 11, and the piston cross section of the second cylinder rod 14 is larger than the piston cross section of the first cylinder rod 13, so that the telescopic cylinder 1 can meet the requirement of larger pressure, the waste of the inner diameter can be reduced under the condition of smaller pressure, in addition, the whole weight can be reduced, and the use cost is reduced.
In an embodiment, the telescopic cylinder 1 may comprise a telescopic cylinder, a telescopic electric cylinder, etc.
As shown in fig. 1, in an embodiment, since the inner diameter of the second cylinder 12 is larger than the inner diameter of the first cylinder 11, the second cylinder 12 can be used to bear larger pressure, while the first cylinder 11 is located above the second cylinder 12, and the second cylinder 12 located below can also be used to bear the weight of the first cylinder 11, so that the bearing capacity of the second cylinder 12 is higher than in the case that the first cylinder 11 is located below the second cylinder 12, and the telescopic cylinder 1 can maintain better stability during the telescopic process.
As shown in fig. 1 to 3, in an embodiment, the first cylinder 11 is provided with a first rodless chamber 111 and a first rod-shaped chamber 112, and the first rodless chamber 111 and the first rod-shaped chamber 112 are separated by a piston of the first cylinder rod 13, and the volumes of the first rodless chamber 111 and the first rod-shaped chamber 112 can be increased or decreased during sliding of the piston of the first cylinder rod 13 in the first cylinder 11. It should be appreciated that, in the case where the volume of the first cylinder 11 is unchanged, the volume of the first rodless chamber 111 increases, and the volume of the first rod-containing chamber 112 may be reduced; conversely, a decrease in the volume of the first rodless chamber 111 may cause an increase in the volume of the first rod-bearing chamber 112.
As shown in fig. 1 to 3, in an embodiment, the second cylinder body 12 is provided with a second rodless chamber 121 and a second rod chamber 122, the second rodless chamber 121 and the second rod chamber 122 are separated by a piston of the second cylinder rod 14, and the volumes of the second rodless chamber 121 and the second rod chamber 122 can be increased or decreased during sliding of the piston of the second cylinder rod 14 in the second cylinder body 12. It should be appreciated that where the volume of the second cylinder 12 is unchanged, the volume of the second rodless chamber 121 increases, which may cause the volume of the second rod-bearing chamber 122 to decrease; conversely, a decrease in the volume of the second rodless chamber 121 may cause an increase in the volume of the second rod-bearing chamber 122.
As shown in fig. 1-3, in an embodiment, the telescopic cylinder 1 may further include a first oil pipe 15 and a second oil pipe 16, the first oil pipe 15 is used for communicating the first rodless cavity 111 and the second rodless cavity 121, and the second oil pipe 16 is used for communicating the first rod cavity 112 and the second rod cavity 122. Thus, in the extending process of the telescopic cylinder 1, under the guiding action of the first oil pipe 15, hydraulic oil can synchronously enter the first rodless cavity 111 and the second rodless cavity 121, so that the first cylinder body 11 and the second cylinder body 12 can synchronously move, and the stability of the telescopic cylinder 1 and the crane arm in the extending process is improved. In the shortening process of the telescopic cylinder 1, under the guiding action of the second oil pipe 16, hydraulic oil can synchronously enter the first rod cavity 112 and the second rod cavity 122, so that the first cylinder body 11 and the second cylinder body 12 can synchronously move, and the stability of the telescopic cylinder 1 and the crane arm in the shortening process is improved.
As shown in fig. 1-3, in one embodiment, the first rodless cavity 111 may be located above the first rod cavity 112, and correspondingly, the second rodless cavity 121 may be located above the second rod cavity 122.
As shown in fig. 1-3, in a first embodiment, the first rodless cavity 111 may be located below the first rod cavity 112, and correspondingly, the second rodless cavity 121 may be located below the second rod cavity 122.
As shown in fig. 1 to 3, in an embodiment, a connection between the first oil pipe 15 and the first rodless chamber 111 is located at the top end of the first cylinder 11, and a connection between the first oil pipe 15 and the second rodless chamber 121 is located at the top end of the second cylinder 12. Thus, after the hydraulic oil enters the first rodless cavity 111, the hydraulic oil can enter the second rodless cavity 121 through the first oil pipe 15 in time, so that the movement synchronism of the first cylinder body 11 and the second cylinder body 12 is ensured.
In addition, since the communication position between the first oil pipe 15 and the first rodless cavity 111 is located at the top end of the first cylinder body 11, the piston of the first cylinder rod 13 is not easy to pass through the position where the communication position between the first oil pipe 15 and the first rodless cavity 111 is located in the sliding process of the piston of the first cylinder rod 13 in the first cylinder body 11, and thus the communication position between the first oil pipe 15 and the first rodless cavity 111 is not easy to be blocked. Similarly, since the communication position between the first oil pipe 15 and the second rodless cavity 121 is located at the top end of the second cylinder body 12, the piston of the second cylinder rod 14 is not easy to pass through the position where the communication position between the first oil pipe 15 and the second rodless cavity 121 is located in the sliding process of the piston of the second cylinder rod 14 in the second cylinder body 12, and thus the communication position between the first oil pipe 15 and the second rodless cavity 121 is not easy to be blocked.
As shown in fig. 1-3, in one embodiment, the connection between the second oil pipe 16 and the first rod-shaped cavity 112 is located at the bottom end of the first cylinder 11, and the connection between the second oil pipe 16 and the second rod-shaped cavity 122 is located at the bottom end of the second cylinder 12. Thus, after the hydraulic oil enters the first rod cavity 112, the hydraulic oil can timely enter the second rod cavity 122 through the second oil pipe 16, and the movement synchronism of the first cylinder body 11 and the second cylinder body 12 is ensured.
In addition, since the communication position between the second oil pipe 16 and the first rod cavity 112 is located at the bottom end of the first cylinder 11, the piston of the first cylinder rod 13 is not easy to pass through the position where the communication position between the second oil pipe 16 and the first rod cavity 112 is located in the sliding process of the piston in the first cylinder 11, and thus the communication position between the second oil pipe 16 and the first rod cavity 112 is not easy to be blocked. Similarly, since the communication position between the second oil pipe 16 and the second rod cavity 122 is located at the bottom end of the second cylinder body 12, the piston of the second cylinder rod 14 is not easy to pass through the position where the communication position between the second oil pipe 16 and the second rod cavity 122 is located in the sliding process of the piston of the second cylinder rod 14 in the second cylinder body 12, and thus the communication position between the second oil pipe 16 and the second rod cavity 122 is not easy to be blocked.
It should be understood that, as shown in fig. 1-3, the communication between the first oil pipe 15 and the first rodless cavity 111 is not blocked during the upward sliding of the piston of the first cylinder rod 13, and the communication between the second oil pipe 16 and the first rod cavity 112 is not blocked during the downward sliding of the piston of the first cylinder rod 13. The communication between the first oil pipe 15 and the second rodless cavity 121 is not blocked in the process of sliding the piston of the second cylinder rod 14 upwards, and the communication between the second oil pipe 16 and the second rod cavity 122 is not blocked in the process of sliding the piston of the second cylinder rod 14 downwards.
As shown in fig. 1 to 3, in an embodiment, the first cylinder rod 13 is provided with a first oil passage 131, and the first oil passage 131 penetrates the piston of the first cylinder block 11 to communicate with the first rodless chamber 111. It should be understood that hydraulic oil may enter the first rodless chamber 111 through the first oil passage 131, or hydraulic oil may flow out of the first rodless chamber 111 through the first oil passage 131. In fig. 1 to 3, the direction indicated by the arrow a can be understood as the direction in which the hydraulic oil enters the first rodless chamber 111. The direction indicated by the arrow B can be understood as the direction in which the hydraulic oil flows out from the first rodless chamber 111. After the hydraulic oil enters the first rodless chamber 111 from the first oil passage 131, the hydraulic oil may enter the second rodless chamber 121 through the first oil passage 131. The hydraulic oil in the second rodless chamber 121 may also enter the first rodless chamber 111 through the first oil passage 131, and flow out through the first oil passage 131.
As shown in fig. 1-3, in one embodiment, the first cylinder rod 13 is further provided with a second oil passage 132, the second oil passage 132 communicating with the first rod chamber 112. It should be appreciated that hydraulic oil may enter the first rod chamber 112 through the second oil passage 132 or hydraulic oil may exit the first rod chamber 112 through the second oil passage 132. In fig. 1-3, the direction indicated by arrow C can be understood as the direction of hydraulic oil into the first rod chamber 112. The direction indicated by the arrow D can be understood as the direction in which hydraulic oil flows out of the first rod chamber 112. After the hydraulic oil enters the first rod chamber 112 from the second oil passage 132, the hydraulic oil may enter the second rod chamber 122 through the second oil passage 132. The hydraulic oil in the second rod chamber 122 may also enter the first rod chamber 112 through the second oil passage 132 and flow out through the second oil passage 132.
As shown in fig. 2 and 3, in one embodiment, the maximum stroke length of the first rodless chamber 111 is greater than the maximum stroke length of the second rodless chamber 121. The maximum stroke length of the first rodless chamber 111 can be understood as the maximum height of the first rodless chamber 111 when the piston of the first cylinder rod 13 slides to the lowest side of the first cylinder body 11. Similarly, the maximum stroke length of the second rodless chamber 121 can be understood as the maximum height of the second rodless chamber 121 when the piston of the second cylinder rod 14 slides to the lowest of the second cylinder body 12. Thus, after the primary extension process is completed, the piston of the second cylinder rod 14 reaches the maximum stroke of the first rodless chamber 111, but the first cylinder body 11 may continue to move with respect to the first cylinder rod 13, thereby achieving the secondary extension process. It should be understood that the process of contracting the telescopic cylinder 1 is opposite to the process of extending, and will not be described in detail here.
As shown in fig. 1 to 3, in an embodiment, the first cylinder rod 13, the second cylinder rod 14, the first cylinder block 11, and the second cylinder block 12 are coaxially disposed. In this way, the second cylinder rod 14, the first cylinder 11, and the second cylinder 12 are unlikely to deviate in the overall movement direction during movement relative to the first cylinder rod 13, and thus are unlikely to be stuck, and the smoothness of the extension or shortening process can be effectively improved.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (9)
1. A telescopic cylinder for a boom, the boom comprising a first arm and a second arm, the telescopic cylinder comprising:
a first cylinder (11) configured to be connected to the second arm;
a second cylinder (12) configured to be connected to the second arm, and the second cylinder (12) is connected to the first cylinder (11);
a first cylinder rod (13) configured to be connected to the first arm, the first cylinder rod (13) penetrating through the first cylinder (11) and the second cylinder (12), and a piston of the first cylinder rod (13) configured to slide in the first cylinder (11);
the second cylinder rod (14) is arranged in the second cylinder body (12) in a penetrating mode, the second cylinder rod (14) is sleeved outside the first cylinder rod (13) in a sliding mode, and a piston of the second cylinder rod (14) is configured to slide in the second cylinder body (12);
wherein the inner diameter of the second cylinder body (12) is larger than the inner diameter of the first cylinder body (11); the piston cross-sectional area of the second cylinder rod (14) is larger than the piston cross-sectional area of the first cylinder rod (13); the first cylinder rod (13), the second cylinder rod (14), the first cylinder body (11) and the second cylinder body (12) are coaxially arranged.
2. Telescopic cylinder according to claim 1, characterized in that the first cylinder body (11) is provided with a first rodless cavity (111) and a first rod cavity (112), the second cylinder body (12) is provided with a second rodless cavity (121) and a second rod cavity (122);
the telescopic cylinder further comprises:
-a first oil pipe (15) configured to communicate said first rodless cavity (111) with said second rodless cavity (121);
a second oil conduit (16) configured to communicate the first rod-bearing chamber (112) with the second rod-bearing chamber (122).
3. Telescopic cylinder according to claim 2, characterized in that the maximum stroke length of the first rodless chamber (111) is greater than the maximum stroke length of the second rodless chamber (121).
4. Telescopic cylinder according to claim 2, characterized in that the first cylinder rod (13) is provided with a first oil duct (131) and a second oil duct (132), the first oil duct (131) penetrating the piston of the first cylinder rod (13) to communicate with the first rodless chamber (111), the second oil duct (132) communicating with the first rod chamber (112).
5. Telescopic cylinder according to claim 2, characterized in that the communication of the first oil pipe (15) with the first rodless cavity (111) is located at the top end of the first cylinder body (11); the communication position of the first oil pipe (15) and the second rodless cavity (121) is positioned at the top end of the second cylinder body (12).
6. Telescopic cylinder according to claim 2, characterized in that the second oil pipe (16) is located at the bottom end of the first cylinder body (11) in communication with the first rod-shaped cavity (112); the communication position of the second oil pipe (16) and the second rod cavity (122) is positioned at the bottom end of the second cylinder body (12).
7. Telescopic cylinder according to claim 1, characterized in that the first cylinder body (11) is located above the second cylinder body (12).
8. A boom, comprising:
a first arm;
a second arm segment;
telescopic cylinder according to any of claims 1 to 7, the first cylinder rod (13) being connected to the first knuckle arm, the first cylinder body (11) and the second cylinder body (12) both being connected to the second knuckle arm.
9. A crane, comprising:
a body;
the lift arm of claim 8, wherein the first arm is coupled to the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111129613.1A CN113816286B (en) | 2021-09-26 | 2021-09-26 | Telescopic cylinder, crane boom and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111129613.1A CN113816286B (en) | 2021-09-26 | 2021-09-26 | Telescopic cylinder, crane boom and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113816286A CN113816286A (en) | 2021-12-21 |
| CN113816286B true CN113816286B (en) | 2023-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111129613.1A Active CN113816286B (en) | 2021-09-26 | 2021-09-26 | Telescopic cylinder, crane boom and crane |
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| CN (1) | CN113816286B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202280689U (en) * | 2011-10-31 | 2012-06-20 | 湖南特力液压有限公司 | Multistage hydraulic cylinder |
| CN103896155A (en) * | 2014-01-27 | 2014-07-02 | 徐州徐工随车起重机有限公司 | Hydraulic control system for controlling double cylinders to telescope sequentially, suspension arm mechanism and crane |
| CN108840258A (en) * | 2018-07-05 | 2018-11-20 | 湖南华钻智能科技有限公司 | It is a kind of to combine flexible arm system and engineering machinery |
| CN109231030A (en) * | 2018-11-27 | 2019-01-18 | 千人计划常州新能源汽车研究院有限公司 | A kind of telescopic arm of engineering truck |
| CN109780003A (en) * | 2019-01-31 | 2019-05-21 | 山东万通液压股份有限公司 | A kind of flexible thrust double acting cylinder of stroke limit second level |
| CN110159612A (en) * | 2019-06-26 | 2019-08-23 | 三一重型装备有限公司 | Telescoping cylinder and telescope support |
-
2021
- 2021-09-26 CN CN202111129613.1A patent/CN113816286B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202280689U (en) * | 2011-10-31 | 2012-06-20 | 湖南特力液压有限公司 | Multistage hydraulic cylinder |
| CN103896155A (en) * | 2014-01-27 | 2014-07-02 | 徐州徐工随车起重机有限公司 | Hydraulic control system for controlling double cylinders to telescope sequentially, suspension arm mechanism and crane |
| CN108840258A (en) * | 2018-07-05 | 2018-11-20 | 湖南华钻智能科技有限公司 | It is a kind of to combine flexible arm system and engineering machinery |
| CN109231030A (en) * | 2018-11-27 | 2019-01-18 | 千人计划常州新能源汽车研究院有限公司 | A kind of telescopic arm of engineering truck |
| CN109780003A (en) * | 2019-01-31 | 2019-05-21 | 山东万通液压股份有限公司 | A kind of flexible thrust double acting cylinder of stroke limit second level |
| CN110159612A (en) * | 2019-06-26 | 2019-08-23 | 三一重型装备有限公司 | Telescoping cylinder and telescope support |
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| CN113816286A (en) | 2021-12-21 |
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