Hydraulic system and tower

Abstract

The embodiment of the utility model provides a hydraulic system and a tower. The hydraulic system comprises an oil pump assembly, a clamping assembly, a main oil way, an auxiliary oil way, a first control valve and an energy accumulator. The first control valve comprises a first working port and a second working port, one end of the third oil way is communicated with the first working port, the other end of the third oil way is communicated with one of the rod cavity and the rodless cavity, and the two opposite ends of the first oil supply way are communicated with the second working port and an oil outlet of the oil pump assembly respectively. And the energy accumulator is arranged on the third oil way. The first control valve is provided with a first working position and a second working position, and when the first control valve is located at the first working position, the first working opening and the second working opening are disconnected; and when the first control valve is located at the second working position, the first working port is communicated with the second working port. According to the hydraulic system, the clamping assembly can have good clamping force.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, and in particular relates to a hydraulic system and a tower. BACKGROUND

[0002] In the related art, the tower supplies oil to the clamping cylinder through an oil circuit to drive the clamping cylinder to extend or retract, so as to realize the clamping action of the clamping assembly.

[0003] However, in the hydraulic system of the related art, the clamping cylinder is prone to hydraulic oil leakage during long-term use, which can result in poor extension and retraction of the clamping cylinder, and further result in weak clamping force of the clamping assembly, thereby causing a great safety hazard. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the main purpose of the embodiments of the present application is to provide a hydraulic system and a tower capable of enabling the clamping assembly to have good clamping force

[0005] To achieve the above-mentioned purpose, the technical scheme of the embodiments of the present application is as follows:

[0006] The first aspect of the embodiments of the present application provides a hydraulic system, comprising:

[0007] an oil pump assembly;

[0008] a clamping assembly, the clamping assembly comprising a clamping cylinder having a rodless cavity and a rod cavity;

[0009] a main oil circuit, the main oil circuit comprising a first oil circuit and a second oil circuit, opposite ends of the first oil circuit being in communication with the rod cavity and the oil pump assembly respectively, and opposite ends of the second oil circuit being in communication with the rodless cavity and the oil pump assembly respectively;

[0010] a secondary oil circuit, the secondary oil circuit comprising a third oil circuit and a first oil supply circuit;

[0011] a first control valve, the first control valve comprising a first working port and a second working port, one end of the third oil circuit being in communication with the first working port, and the other end being in communication with one of the rod cavity and the rodless cavity, and opposite ends of the first oil supply circuit being in communication with the second working port and an oil outlet of the oil pump assembly respectively;

[0012] an accumulator, the accumulator being arranged on the third oil circuit;

[0013] The first control valve has a first working position and a second working position, when the first control valve is in the first working position, the first working port is disconnected from the second working port, and when the first control valve is in the second working position, the first working port is in communication with the second working port.

[0014] In one embodiment, the third oil passage is in communication with the rod chamber at an end away from the first working port.

[0015] In one embodiment, the first control valve further comprises a third working port, and the auxiliary oil passage further comprises a first return oil passage, opposite ends of the first return oil passage being in communication with the third working port and an oil inlet of the oil pump assembly, respectively.

[0016] The first control valve further has a third working position, when the first control valve is in the first working position and the second working position, the first working port is disconnected from the third working port; when the first control valve is in the third working position, the first working port is in communication with the third working port and disconnected from the second working port.

[0017] In one embodiment, the hydraulic system further comprises an overflow valve, and the auxiliary oil passage further comprises a second return oil passage, opposite ends of the second return oil passage being in communication with the third oil passage and the oil inlet of the oil pump assembly, respectively, and the overflow valve is arranged on the second return oil passage.

[0018] In one embodiment, the hydraulic system further comprises a relay, and the auxiliary oil passage further comprises a first branch, the accumulator is in communication with the third oil passage through the first branch, and the relay is arranged on the first branch.

[0019] In one embodiment, the oil pump assembly comprises a main oil pump and an emergency pump, the main oil passage further comprises a second oil supply passage and a third return oil passage, a first end of the second oil supply passage is selectively in communication with an oil outlet of one of the main oil pump and the emergency pump, a second end of the third return oil passage is in communication with oil inlets of the main oil pump and the emergency pump, respectively, a third end of the second oil supply passage is selectively in communication with one of the first oil passage and the second oil passage, and a fourth end of the third return oil passage is selectively in communication with the other of the first oil passage and the second oil passage.

[0020] In one embodiment, the hydraulic system further comprises a second control valve, the second control valve is arranged at the first end and in communication with the main oil pump and the emergency pump, respectively; and / or,

[0021] The hydraulic system further comprises a third control valve, the third control valve comprising a fourth working port, a fifth working port, a sixth working port and a seventh working port, the fourth working port being in communication with the third end, the fifth working port being in communication with the fourth end, the sixth working port being in communication with the first oil path, and the seventh working port being in communication with the second oil path, the third control valve having a fourth working position and a fifth working position, when the third control valve is in the fourth working position, the fourth working port is in communication with the sixth working port, and the fifth working port and the seventh working port are in communication; when the third control valve is in the fifth working position, the fourth working port is in communication with the seventh working port, and the fifth working port and the sixth working port are in communication.

[0022] In an embodiment, the hydraulic system comprises a plurality of the clamping oil cylinders, each of the clamping oil cylinders being connected in parallel and being in communication with the main oil path and the oil pump assembly, and the third oil path being in communication with each of the clamping oil cylinders at an end away from the first working port.

[0023] In an embodiment, the first control valve is a three-position four-way electromagnetic valve.

[0024] A second aspect of the embodiment of the present application provides a tower, which comprises the hydraulic system as described above.

[0025] The hydraulic system and the tower provided by the embodiment of the present application comprise an oil pump assembly, a clamping assembly, a main oil path, a secondary oil path, a first control valve and an accumulator. One end of a third oil path is in communication with a first working port, and the other end is in communication with one of a rod cavity and a rodless cavity. Opposite ends of a first oil supply path are in communication with a second working port and an oil outlet of the oil pump assembly, respectively. The accumulator is arranged on the third oil path. Thus, because the accumulator is arranged, the accumulator has a good pressure maintaining effect. When the clamping oil cylinder leaks hydraulic oil, the accumulator can timely supplement the hydraulic oil to the clamping oil cylinder to improve the extension and retraction effect of the clamping oil cylinder. Meanwhile, the first control valve has a first working position and a second working position. When the first control valve is in the first working position, the first working port is disconnected from the second working port. When the first control valve is in the second working position, the first working port is in communication with the second working port. Thus, when the clamping oil cylinder is prone to hydraulic oil leakage in a long-term use process, the first control valve can be in the second working position to enable the oil pump assembly to supplement the hydraulic oil to the clamping oil cylinder through the third oil path, so that the clamping oil cylinder can maintain a good extension and retraction effect, thereby enabling the clamping assembly of the tower to have a strong clamping force, and thus reducing the safety hazard. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a schematic structural diagram of a hydraulic system according to an embodiment of the present application;

[0027] Figure 2 is Figure 1 a close-up view of the middle A;

[0028] Figure 3 is Figure 2 a close-up view of the middle D;

[0029] Figure 4 is Figure 1 a close-up view of the middle B;

[0030] Figure 5 is Figure 1 a close-up view of the middle C.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 10, oil pump assembly; 11, main oil pump; 12, emergency pump; 20, clamping cylinder; 20a, rodless cavity; 20b, rod cavity; 30, main oil path; 31, first oil path; 32, second oil path; 33, second oil supply path; 331, first end; 332, third end; 34, third oil return path; 341, second end; 342, fourth end; 40, auxiliary oil path; 41, third oil path; 42, first oil supply path; 43, first oil return path; 44, second oil return path; 50, first control valve; 50a, first working port; 50b, second working port; 50c, third working port; 60, accumulator; 70, overflow valve; 80, relay; 90, second control valve; 91, third control valve; 911, fourth working port; 912, fifth working port; 913, sixth working port; 914, seventh working port. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described in further detail below with reference to the drawings, and the described embodiments should not be regarded as limiting the present application, and all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two and more than two, unless otherwise explicitly specified.

[0035] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as those commonly understood by those skilled in the art. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0036] An embodiment of the present application provides a hydraulic system, referring to Figures 1 to 3 The hydraulic system comprises an oil pump assembly 10, a clamping assembly, a main oil path 30, a secondary oil path 40, a first control valve 50 and an accumulator 60.

[0037] The clamping assembly comprises a clamping oil cylinder 20 having a rodless cavity 20a and a rod cavity 20b.

[0038] The main oil path 30 comprises a first oil path 31 and a second oil path 32, opposite ends of the first oil path 31 are communicated with the rod cavity 20b and the oil pump assembly 10 respectively, and opposite ends of the second oil path 32 are communicated with the rodless cavity 20a and the oil pump assembly 10 respectively.

[0039] The secondary oil path 40 comprises a third oil path 41 and a first oil supply path 42.

[0040] The first control valve 50 comprises a first working port 50a and a second working port 50b, one end of the third oil path 41 is communicated with the first working port 50a, and the other end is communicated with one of the rod cavity 20b and the rodless cavity 20a, and opposite ends of the first oil supply path 42 are communicated with the second working port 50b and an oil outlet of the oil pump assembly 10 respectively.

[0041] The accumulator 60 is arranged on the third oil path 41.

[0042] The first control valve 50 has a first working position and a second working position, when the first control valve 50 is in the first working position, the first working port 50a is disconnected with the second working port 50b, and when the first control valve 50 is in the second working position, the first working port 50a is communicated with the second working port 50b.

[0043] Another embodiment of the present application provides a tower, the tower comprising the hydraulic system of any of the present application.

[0044] Specifically, the hydraulic system of the present application can be the hydraulic system in any device or structure, for the convenience of description, the hydraulic system of the present application is described by taking the hydraulic system used in the tower as an example.

[0045] Specifically, the specific structure of the oil pump assembly 10 is not limited.

[0046] For example, the oil pump assembly 10 comprises a main oil pump 11, the flow of the hydraulic oil in the hydraulic system is maintained through the main oil pump 11, and at the same time, the oil pump assembly 10 can supplement the oil to the clamping oil cylinder 20 through the main oil pump 11 when the clamping oil cylinder 20 leaks.

[0047] For example, the oil pump assembly 10 includes a main oil pump 11 and an emergency pump 12, wherein the main oil pump 11 is used to maintain the flow of hydraulic oil in the hydraulic system under normal circumstances, and the emergency pump 12 is used to supplement the hydraulic oil to the clamping oil cylinder 20 when the clamping oil cylinder 20 leaks. Thus, it is more convenient to supplement the hydraulic oil to the clamping oil cylinder 20.

[0048] In the tower, the clamping oil cylinder 20 can be the oil cylinder structure of the clamping assembly. For example, through the extension and retraction of the clamping oil cylinder 20, the clamping and loosening operations of the clamping assembly can be realized.

[0049] The main oil circuit 30 is an oil circuit for the oil pump assembly 10 to supply and return the hydraulic oil to the clamping oil cylinder 20. During the normal use of the hydraulic system, the oil pump assembly 10 supplies the hydraulic oil to one of the rodless cavity 20a and the rod cavity 20b through the main oil circuit 30, so as to realize the extension and retraction of the clamping oil cylinder 20.

[0050] It should be noted that according to actual needs, the oil outlet of the oil pump assembly 10 can be selectively communicated with one of the first oil circuit 31 and the second oil circuit 32 for oil supplementing, and the oil inlet of the oil pump assembly 10 is communicated with the other one of the first oil circuit 31 and the second oil circuit 32 for oil returning.

[0051] For example, when the end of the first oil circuit 31 away from the rod cavity 20b is communicated with the oil outlet of the oil pump assembly 10, the end of the second oil circuit 32 away from the rodless cavity 20a is communicated with the oil inlet of the oil pump assembly 10, so as to realize the supply of the hydraulic oil to the rod cavity 20b, and the retracting of the telescopic rod of the oil pump assembly 10.

[0052] When the end of the first oil circuit 31 away from the rod cavity 20b is communicated with the oil inlet of the oil pump assembly 10, the end of the second oil circuit 32 away from the rodless cavity 20a is communicated with the oil outlet of the oil pump assembly 10, so as to realize the supply of the hydraulic oil to the rodless cavity 20a, and the extension of the telescopic rod of the oil pump assembly 10.

[0053] The auxiliary oil circuit 40 is an oil supplementing circuit for the oil pump assembly 10 to supplement the hydraulic oil to the clamping oil cylinder 20 and the accumulator 60, and the accumulator 60 is arranged on the third oil circuit 41 of the auxiliary oil circuit 40, which can also play a pressure maintaining role.

[0054] It should be noted that in some embodiments, the end of the third oil circuit 41 communicated with the clamping oil cylinder 20 can be communicated with the rod cavity 20b. In other embodiments, the end of the third oil circuit 41 communicated with the clamping oil cylinder 20 can also be communicated with the rodless cavity 20a.

[0055] For example, referring to Figure 2 and Figure 3The end of the third oil passage 41 opposite to the first working port 50a is connected to the rod chamber 20b. This facilitates the oil pump assembly 10 to replenish oil to the clamping cylinder 20, so that the clamping assembly of the tower can maintain a good clamping effect.

[0056] The first control valve 50 is located between the third oil passage 41 and the first oil supply passage 42. The other end of the first oil supply passage 42 is connected to the oil outlet of the oil pump assembly 10. When the first control valve 50 is in the first working position, the first working port 50a and the second working port 50b are disconnected, the first oil supply passage 42 and the third oil passage 41 are not connected, and the oil pump assembly 10 cannot replenish oil to the clamping cylinder 20, thus achieving constant pressure maintenance of the oil pump assembly 10. When the first control valve 50 is in the second working position, the first working port 50a and the second working port 50b are connected, and the first oil supply passage 42 and the third oil passage 41 are connected. Therefore, oil can be replenished to the clamping cylinder 20 through the oil pump assembly 10, so that the clamping cylinder 20 has a better extension and retraction effect, ensuring that the clamping assembly of the tower has a better clamping force.

[0057] It is understandable that by switching the first control valve 50, the working position of the first control valve 50 can be switched.

[0058] It should be noted that the specific type of the first control valve 50 is not limited.

[0059] For example, the first control valve 50 is a three-position four-way solenoid valve, which can achieve the effect of precisely controlling the switching of working positions.

[0060] In the hydraulic system of this embodiment, one end of the third oil circuit 41 is connected to the first working port 50a, and the other end is connected to one of the rod chamber 20b and the rodless chamber 20a. The opposite ends of the first oil supply circuit 42 are respectively connected to the second working port 50b and the oil outlet of the oil pump assembly 10. The accumulator 60 is disposed on the third oil circuit 41. Therefore, due to the presence of the accumulator 60, it has a better pressure holding effect. When the clamping cylinder 20 leaks hydraulic oil, the accumulator 60 can promptly replenish oil to the clamping cylinder 20 to improve its extension and retraction effect. Simultaneously, the first control valve 50 has a first working position and a second working position. When the first control valve 50 is in the first working position, the first working port 50a is disconnected from the second working port 50b. When the first control valve 50 is in the second working position, the first working port 50a is connected to the second working port 50b. Therefore, when hydraulic oil leakage is likely to occur in the clamping cylinder 20 during long-term use, the first control valve 50 can be placed in the second working position so that the oil pump assembly 10 can replenish oil to the clamping cylinder 20 through the third oil circuit 41, which can further enable the clamping cylinder 20 to maintain a good extension and retraction effect, thereby enabling the clamping assembly to have a strong clamping force and thus reducing safety hazards.

[0061] In one embodiment, please refer to Figure 2 and Figure 3 The first control valve 50 also includes a third working port 50c, and the auxiliary oil circuit 40 also includes a first return oil circuit 43. The two ends of the first return oil circuit 43 are respectively connected to the third working port 50c and the oil inlet of the oil pump assembly 10.

[0062] The first control valve 50 also has a third operating position. When the first control valve 50 is in the first operating position and the second operating position, the first operating port 50a is disconnected from the third operating port 50c; when the first control valve 50 is in the third operating position, the first operating port 50a is connected to the third operating port 50c and disconnected from the second operating port 50b. This facilitates the unloading of the accumulator 60.

[0063] Specifically, when the first control valve 50 switches to the third working position, the first working port 50a is only connected to the third working port 50c, thereby connecting the third oil circuit 41 with the first return oil circuit 43, which facilitates the return of hydraulic oil from the accumulator 60 to the oil pump assembly 10, thereby enabling the accumulator 60 to be unloaded.

[0064] It is understandable that when the first control valve 50 switches to either the first working position or the second working position, the first working port 50a is disconnected from the third working port 50c.

[0065] In one embodiment, please refer to Figure 2 and Figure 3 The hydraulic system also includes a relief valve 70, and the auxiliary oil circuit 40 includes a second return oil circuit 44. The two ends of the second return oil circuit 44 are respectively connected to the third oil circuit 41 and the oil inlet of the oil pump assembly 10. The relief valve 70 is installed on the second return oil circuit 44. Thus, by setting the relief valve 70, the clamping force of the clamping assembly can be limited to avoid damage caused by excessive clamping force, while also providing a continuous pressure holding effect.

[0066] In one embodiment, please refer to Figure 2 and Figure 3 The hydraulic system also includes a relay 80, and the auxiliary oil circuit 40 includes a first branch. The accumulator 60 is connected to the third oil circuit 41 through the first branch, and the relay 80 is located on the first branch. Therefore, by setting the relay 80, a better monitoring and alarm effect can be achieved. An alarm signal can be issued in the event of hydraulic oil leakage in the clamping assembly, so that the oil pump assembly 10 can replenish oil to the clamping cylinder 20 through the auxiliary oil circuit 40.

[0067] In one embodiment, please refer to Figure 1 and Figure 4The oil pump assembly 10 includes a main oil pump 11 and an emergency pump 12. The main oil circuit 30 also includes a second oil supply circuit 33 and a third oil return circuit 34. The first end 331 of the second oil supply circuit 33 can be selectively connected to the oil outlet of one of the main oil pump 11 and the emergency pump 12. The second end 341 of the third oil return circuit 34 is connected to the oil inlet of both the main oil pump 11 and the emergency pump 12. The third end 332 of the second oil supply circuit 33 can be selectively connected to one of the first oil circuit 31 and the second oil circuit 32. The fourth end 342 of the third oil return circuit 34 can be selectively connected to the other of the first oil circuit 31 and the second oil circuit 32. Thus, by providing the emergency pump 12, oil can be better supplied to the clamping cylinder 20 in the event of hydraulic oil leakage from the clamping assembly.

[0068] Specifically, one end of the third return oil circuit 34 (i.e., the second end 341) is connected to the oil inlet of the main oil pump 11 and the emergency pump 12 respectively, while the other end of the third return oil circuit 34 (i.e., the fourth end 342) is connected to the clamping assembly to allow the hydraulic oil of the clamping assembly to flow back to the main oil pump 11 and the emergency pump 12.

[0069] Depending on the actual situation, in some embodiments, one end of the second oil supply passage 33 (i.e., the first end 331) may be connected to the main oil pump 11, the other end of the second oil supply passage 33 (i.e., the third end 332) may be connected to the first oil passage 31, and the end of the third return oil passage 34 away from the oil pump assembly 10 (i.e., the fourth end 342) may be connected to the second oil passage 32. Thus, the main oil pump 11 can supply oil to the first oil passage 31 through the second oil supply passage 33, and then supply oil to the rod chamber 20b. At the same time, the hydraulic oil in the rodless chamber 20a can flow back to the main oil pump 11 and the emergency pump 12 through the second oil passage 32 and the third return oil passage 34.

[0070] In some embodiments, one end of the second oil supply passage 33 (i.e., the first end 331) may be connected to the main oil pump 11, the other end of the second oil supply passage 33 (i.e., the third end 332) may be connected to the second oil passage 32, and the end of the third return oil passage 34 away from the oil pump assembly 10 (i.e., the fourth end 342) may be connected to the first oil passage 31. Thus, the main oil pump 11 can supply oil to the second oil passage 32 through the second oil supply passage 33, and then supply oil to the rodless chamber 20a, while the hydraulic oil in the rod chamber 20b can flow back to the main oil pump 11 and the emergency pump 12 through the first oil passage 31 and the third return oil passage 34.

[0071] In some embodiments, one end of the second oil supply passage 33 (i.e., the first end 331) may be connected to the emergency pump 12, the other end of the second oil supply passage 33 (i.e., the third end 332) may be connected to the first oil passage 31, and the end of the third return oil passage 34 away from the oil pump assembly 10 (i.e., the fourth end 342) may be connected to the second oil passage 32. Thus, the emergency pump 12 can supply oil to the first oil passage 31 through the second oil supply passage 33, and then supply oil to the rod chamber 20b, while the hydraulic oil in the rodless chamber 20a can flow back to the main oil pump 11 and the emergency pump 12 through the second oil passage 32 and the third return oil passage 34.

[0072] In some embodiments, one end of the second oil supply passage 33 (i.e., the first end 331) may be connected to the emergency pump 12, the other end of the second oil supply passage 33 (i.e., the third end 332) may be connected to the second oil passage 32, and the end of the third return oil passage 34 away from the oil pump assembly 10 (i.e., the fourth end 342) may be connected to the first oil passage 31. Thus, the emergency pump 12 can supply oil to the second oil passage 32 through the second oil supply passage 33, and then supply oil to the rodless chamber 20a, while the hydraulic oil in the rod chamber 20b can flow back to the main oil pump 11 and the emergency pump 12 through the first oil passage 31 and the third return oil passage 34.

[0073] It should be noted that the switching of the above-mentioned oil circuit can be achieved through a control valve, and the specific implementation method is not limited.

[0074] For example, please refer to Figure 1 and Figure 4 The hydraulic system also includes a second control valve 90, which is located at the first end 331 and is connected to the main oil pump 11 and the emergency pump 12 respectively.

[0075] In other words, by setting a second control valve 90 between the second oil supply line 33 and the oil pump assembly 10, the second oil supply line 33 can be switched between being connected to the oil outlet of the main oil pump 11 and the oil outlet of the emergency pump 12, thereby enabling the switching of the oil circuit.

[0076] It should be noted that the specific structural type of the second control valve 90 is not limited; for example, the second control valve 90 may be a shuttle valve.

[0077] For example, please refer to Figure 1 and Figure 5The hydraulic system also includes a third control valve 91, which includes a fourth working port 911, a fifth working port 912, a sixth working port 913, and a seventh working port 914. The fourth working port 911 is connected to the third terminal 332, the fifth working port 912 is connected to the fourth terminal 342, the sixth working port 913 is connected to the first oil circuit 31, and the seventh working port 914 is connected to the second oil circuit 32. The third control valve 91 has a fourth working position and a fifth working position. When the third control valve 91 is in the fourth working position, the fourth working port 911 is connected to the sixth working port 913, and the fifth working port 912 is connected to the seventh working port 914. Therefore, by switching different working positions of the third control valve 91, the oil circuit can be switched.

[0078] Specifically, when the third control valve 91 is in the fourth working position, the third control valve 91 can connect the second oil supply line 33 and the first oil line 31, and connect the third oil return line 34 and the second oil line 32, thereby enabling the oil pump assembly 10 to supply oil to the rod chamber 20b and supply hydraulic oil in the rodless chamber 20a to return.

[0079] When the third control valve 91 is in the fifth working position, the third control valve 91 can connect the second oil supply line 33 and the second oil line 32, and connect the third oil return line 34 and the first oil line 31, thereby enabling the oil pump assembly 10 to supply oil to the rodless chamber 20a and supply hydraulic oil in the rod chamber 20b to return.

[0080] It should be noted that the specific structural type of the third control valve 91 is not limited; for example, the third control valve 91 is a three-position four-way solenoid valve.

[0081] For example, the third control valve 91 is a three-position four-way solenoid valve. The third control valve 91 also has a sixth working position. When the third control valve 91 is in the sixth working position, the fourth working port 911, the fifth working port 912, the sixth working port 913 and the seventh working port 914 are all disconnected from each other.

[0082] For example, the third control valve 91 is a three-position four-way solenoid valve. The third control valve 91 also has a sixth working position. When the third control valve 91 is in the sixth working position, only the sixth working port 913 is connected to the fifth working port 912, and the other working ports are disconnected.

[0083] In one embodiment, please refer to Figures 1 to 3The hydraulic system includes multiple clamping cylinders 20 connected in parallel and connected to the oil pump assembly 10 via the main oil passage 30. The end of the third oil passage 41 opposite to the first working port 50a is connected to each of the clamping cylinders 20. This allows the oil pump assembly 10 to simultaneously supply and replenish oil to multiple clamping cylinders 20.

[0084] In one embodiment, the tower's hydraulic system can also drive various loads, such as raising and lowering the tower's skids, raising and lowering the tower's outriggers, and moving the tower's traveling trolley. Alternatively, multiple sets of multi-way valves connected in parallel (P and T) can be used to drive various loads and the tower traveling trolley system.

[0085] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in a specific embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0086] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the protection scope of this application.

Claims

1. A hydraulic system characterized by, The hydraulic system comprises: an oil pump assembly; a clamping assembly comprising a clamping cylinder having a rodless chamber and a rod chamber; a main oil passage comprising a first oil passage and a second oil passage, opposite ends of the first oil passage being in communication with the rod chamber and the oil pump assembly respectively, opposite ends of the second oil passage being in communication with the rodless chamber and the oil pump assembly respectively; a secondary oil passage comprising a third oil passage and a first oil supply passage; a first control valve comprising a first working port and a second working port, one end of the third oil passage being in communication with the first working port, and the other end being in communication with one of the rod chamber and the rodless chamber, opposite ends of the first oil supply passage being in communication with the second working port and an oil outlet of the oil pump assembly respectively; an accumulator arranged on the third oil passage; the first control valve having a first working position and a second working position, when the first control valve is in the first working position, the first working port is disconnected from the second working port, and when the first control valve is in the second working position, the first working port is in communication with the second working port.

2. The hydraulic system of claim 1, wherein, One end of the third oil passage away from the first working port is in communication with the rod chamber.

3. The hydraulic system of claim 1, wherein, The first control valve further comprises a third working port, and the secondary oil passage further comprises a first oil return passage, opposite ends of the first oil return passage being in communication with the third working port and an oil inlet of the oil pump assembly respectively; The first control valve further has a third working position, when the first control valve is in the first working position and the second working position, the first working port is disconnected from the third working port, and when the first control valve is in the third working position, the first working port is in communication with the third working port and disconnected from the second working port.

4. The hydraulic system of any one of claims 1-3, wherein, The hydraulic system further comprises an overflow valve, the secondary oil passage further comprises a second oil return passage, opposite ends of the second oil return passage being in communication with the third oil passage and an oil inlet of the oil pump assembly respectively, and the overflow valve is arranged on the second oil return passage.

5. The hydraulic system of any one of claims 1-3, wherein, The hydraulic system further comprises a relay, the secondary oil passage further comprises a first branch, the accumulator is in communication with the third oil passage through the first branch, and the relay is arranged on the first branch.

6. The hydraulic system of any one of claims 1-3, wherein, The oil pump assembly comprises a main oil pump and an emergency pump, the main oil passage further comprises a second oil supply passage and a third oil return passage, a first end of the second oil supply passage being selectively in communication with an oil outlet of one of the main oil pump and the emergency pump, second ends of the third oil return passage being in communication with oil inlets of the main oil pump and the emergency pump respectively, a third end of the second oil supply passage being selectively in communication with one of the first oil passage and the second oil passage, and fourth ends of the third oil return passage being selectively in communication with the other of the first oil passage and the second oil passage.

7. The hydraulic system of claim 6, wherein, The hydraulic system further comprises a second control valve, the second control valve is arranged at the first end and in communication with the main oil pump and the emergency pump respectively; and / or, The hydraulic system further comprises a third control valve, the third control valve comprising a fourth working port, a fifth working port, a sixth working port and a seventh working port, the fourth working port being in communication with the third end, the fifth working port being in communication with the fourth end, the sixth working port being in communication with the first oil path, the seventh working port being in communication with the second oil path, the third control valve having a fourth working position and a fifth working position, when the third control valve is in the fourth working position, the fourth working port is in communication with the sixth working port, and the fifth working port and the seventh working port are in communication; when the third control valve is in the fifth working position, the fourth working port is in communication with the seventh working port, and the fifth working port and the sixth working port are in communication.

8. The hydraulic system of any one of claims 1-3, wherein, The hydraulic system comprises a plurality of the clamping oil cylinders, each of the clamping oil cylinders being in parallel connection and being in communication with the main oil path and the oil pump assembly, and the third oil path being in communication with each of the clamping oil cylinders at an end away from the first working port.

9. The hydraulic system of any one of claims 1-3, wherein, The first control valve is a three-position four-way electromagnetic valve.

10. A tower characterized in that, The tower comprises the hydraulic system according to any one of claims 1-9.

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