Hydraulic system of a five-head hoop bending machine

Abstract

The present invention discloses a hydraulic system of a five-head hoop bending machine, including two first bending cylinders, three second bending cylinders, five telescopic cylinders, five clamping cylinders, a first oil supply mechanism and a second oil supply mechanism; the first oil supply mechanism is used to supply oil to the two first bending cylinders and the five telescopic cylinders; the second oil supply mechanism is used to supply oil to the three second bending cylinders and the five clamping cylinders; the five telescopic cylinders are each connected to the first oil supply mechanism through a first valve; the five clamping cylinders are commonly connected to the second cylinders through a second valve. The first bending cylinder and the second bending cylinder are respectively used to drive the five heads to perform the operation of bending hoop steel bars, the five telescopic cylinders are respectively used to drive the extension and retraction of the core shafts of the five heads, and the five clamping cylinders are respectively used to achieve the locking of the five heads, so that the whole hoop bending machine is driven by pure hydraulic pressure. The present invention has the advantages of simpler structure, low failure rate and better use effect.

Description

Technical Field

[0001] The invention relates to the field of hoop bending machines, and in particular to a hydraulic system of a five-head hoop bending machine. Background Art

[0002] The hoop bending machine is a processing tool for steel bars. The hoop bending machine is an extension of the bending machine and can better process them into specified angles.

[0003] At present, most of the five-head hoop bending machines adopt hydraulic and pneumatic hybrid power, with complex overall structure, large structure volume and high failure rate. In addition, the positioning of the head adopts a manual mechanical locking device, which is complicated to operate and has poor positioning effect. Summary of the invention

[0004] To this end, it is necessary to provide a hydraulic system for a five-head hoop bending machine to solve the problems of complex power system structure, large size, high failure rate and poor head positioning effect of the five-head hoop bending machine in the prior art.

[0005] To achieve the above object, the inventor provides a hydraulic system of a five-head hoop bending machine, comprising two first bending cylinders, three second bending cylinders, five telescopic cylinders, five clamping cylinders, a first oil supply mechanism and a second oil supply mechanism;

[0006] The first oil supply mechanism is used to supply oil to the two first bending oil cylinders and the five telescopic oil cylinders; the second oil supply mechanism is used to supply oil to the three second bending oil cylinders and the five pressing oil cylinders;

[0007] The five telescopic oil cylinders are respectively connected to the first oil supply mechanism through a first valve; the five clamping oil cylinders are commonly connected to the second oil cylinder through a second valve.

[0008] As a preferred structure of the present invention, the first oil supply mechanism includes a first oil pump and a first oil tank, the oil inlet of the first oil pump is connected to the first oil tank; the oil inlets of the first bending oil cylinder and the first valve are both connected to the oil outlet of the first oil pump;

[0009] The second oil supply mechanism includes a second oil pump and a second oil tank. The oil inlet of the second oil pump is connected to the second oil tank. The oil inlets of the second bending oil cylinder and the second valve are both connected to the oil outlet of the second oil pump.

[0010] As a preferred structure of the present invention, the oil outlet of the first oil pump is sequentially provided with a first main oil circuit pressure regulating valve and a first main valve; the oil outlet of the first oil pump is connected to the oil inlet of the first main oil circuit pressure regulating valve, the oil outlet of the first injection oil circuit pressure regulating valve is connected to the P interface of the first main valve, and the A interface of the main valve of the first oil pump is connected to the first bending oil cylinder and the oil inlet of the first valve;

[0011] The oil outlet hole of the second oil pump is sequentially provided with the second main oil circuit pressure regulating valve and the first main valve; the oil outlet hole of the second oil pump is connected to the oil inlet hole of the second main oil circuit pressure regulating valve, the oil outlet hole of the second injection oil circuit pressure regulating valve is connected to the P interface of the second main valve and the oil inlet of the second valve, and the A interface of the main valve of the second oil pump is connected to the second bending cylinder.

[0012] As a preferred structure of the present invention, each first bending cylinder is connected to the first oil supply mechanism through a first bending solenoid reversing valve; the P interface of the first bending solenoid reversing valve is connected to the oil outlet of the first oil pump, and the T interface of the first bending solenoid reversing valve is connected to the first oil tank; the A interface and B interface of the first bending solenoid reversing valve are respectively connected to the rodless chamber and rod chamber of the first bending cylinder.

[0013] As a preferred structure of the present invention, the B interfaces of the two first bending electromagnetic reversing valves are also connected to the two telescopic cylinders respectively.

[0014] As a preferred structure of the present invention, the first valve is a cartridge valve.

[0015] As a preferred structure of the present invention, it also includes a telescopic solenoid reversing valve; the P interface of the telescopic solenoid reversing valve is connected to the oil outlet of the first oil pump, and the T interface of the telescopic solenoid reversing valve is connected to the first oil tank; the A interface of the telescopic solenoid reversing valve is connected to the rod chambers of five telescopic oil cylinders; the B interface of the telescopic solenoid reversing valve is connected to the rodless chambers of five telescopic oil cylinders; the cartridge valve is located at the oil circuit where the rodless chamber of the telescopic oil cylinder is connected to the B interface of the telescopic solenoid reversing valve.

[0016] As a preferred structure of the present invention, each second bending cylinder is connected to the second oil supply mechanism through a second bending solenoid reversing valve; the P interface of the second bending solenoid reversing valve is connected to the oil outlet of the second oil pump, and the T interface of the second bending solenoid reversing valve is connected to the second oil tank; the A interface and B interface of the second bending solenoid reversing valve are respectively connected to the rodless chamber and rod chamber of the second bending cylinder.

[0017] As a preferred structure of the present invention, a one-way throttle valve is provided at the oil circuit connecting the rodless chambers of the two second bending oil cylinders and the A interface of the second bending electromagnetic reversing valve.

[0018] As a preferred structure of the present invention, a return elastic member is provided in the rod chamber of the clamping oil cylinder; the second valve is a clamping control valve, and the rodless chambers of the five clamping oil cylinders are all connected to the clamping control valve.

[0019] Different from the prior art, the hydraulic system of the five-head hoop bending machine described in the above technical solution includes two first bending cylinders, three second bending cylinders, five telescopic cylinders, five clamping cylinders, a first oil supply mechanism and a second oil supply mechanism; the first oil supply mechanism is used to supply oil to the two first bending cylinders and the five telescopic cylinders; the second oil supply mechanism is used to supply oil to the three second bending cylinders and the five clamping cylinders; the five telescopic cylinders are each connected to the first oil supply mechanism through a first valve; the five clamping cylinders are commonly connected to the second cylinder through a second valve. The first bending cylinder and the second bending cylinder are respectively used to drive the five heads to perform the operation of bending the hoop steel bars, the five telescopic cylinders are respectively used to drive the extension and retraction of the core shafts of the five heads, and the five clamping cylinders are respectively used to achieve the locking of the five heads, so that the hoop bending machine can be driven by pure hydraulic drive, with a simpler structure, a lower failure rate and a better use effect. By using the first oil supply mechanism to form two first bending cylinders and the second oil supply mechanism to form three second bending cylinders, the first bending cylinders and the second bending cylinders can be operated separately. By setting the first valve, different telescopic cylinders can be selectively started to operate. By setting the second valve, the five clamping cylinders can work synchronously. The entire oil circuit design can meet the power needs of the hoop bender in different states, thereby completing the corresponding operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of a hydraulic system of a five-head hoop bending machine involved in one embodiment of the present invention;

[0021] Figure 2 This is a diagram of the oil supply structure of the first oil supply mechanism involved in one embodiment of the present invention;

[0022] Figure 3 This is a diagram of the oil supply structure of the second oil supply mechanism according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. The first bending cylinder;

[0025] 2. Second bending cylinder;

[0026] 3. Telescopic cylinder;

[0027] 4. Press the oil cylinder;

[0028] 5. The first oil pump;

[0029] 6. The first motor;

[0030] 7. First fuel tank;

[0031] 8. Second oil pump;

[0032] 9. Second motor;

[0033] 10. Second fuel tank;

[0034] 11. The first main oil circuit pressure regulating valve;

[0035] 12. First main valve;

[0036] 13. Second main oil circuit pressure regulating valve;

[0037] 14. Second main valve;

[0038] 15. First bending solenoid reversing valve;

[0039] 16. Telescopic solenoid reversing valve;

[0040] 17. Superimposed pressure reducing valve;

[0041] 18. Cartridge valve;

[0042] 19. Second bending solenoid reversing valve;

[0043] 20. One-way throttle valve;

[0044] 21. Tighten the control valve. DETAILED DESCRIPTION

[0045] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0046] See also Figure 1 The present invention provides a hydraulic system of a five-head hoop bending machine, which is used to drive the five-head hoop bending machine to bend steel bars and clamp the heads to a certain position, so that the whole five-head hoop bending machine can be driven purely by hydraulic pressure, thereby simplifying the structure of the whole machine, making the structure more compact, reducing the failure rate, and achieving better use effect.

[0047] In a specific embodiment, the hydraulic system of the five-head hoop bending machine includes two first bending cylinders 1, three second bending cylinders 2, five telescopic cylinders 3, five clamping cylinders 4, a first oil supply mechanism and a second oil supply mechanism. The two first bending cylinders 1 are used to drive the bending disks of two of the five heads to rotate. Specifically, they can be configured to drive the bending disks of the two heads located at the head and tail ends to individually control the synchronous operation of the heads at the head and tail ends, and process the steel bars into a state where only the head and tail ends are bent. The three second bending cylinders 2 are used to drive the bending disks of the other three heads that are not driven by the first bending cylinder 1 to rotate. Specifically, they can be configured to drive the bending disks of the three heads located in the middle to successively cooperate with the heads driven by the first bending cylinder 1 to process the steel bars into a polygonal state. In practical applications, gears can be provided at the bending disk, and the output ends of the first bending cylinder 1 and the second bending cylinder 2 are both configured as racks, which mesh with the gears at the bending disk. During the extension and retraction process of the first bending cylinder 1 and the second bending cylinder 2, the bending disk can be driven to rotate through gear transmission, thereby realizing the conversion of linear motion into rotational motion.

[0048] The five telescopic cylinders 3 are used to drive the core shafts of the five machine heads to extend and retract respectively. When the steel bars need to be placed in the machine head, the telescopic cylinder 3 drives the core shaft to retract to make room for the steel bars. After the steel bars have been placed in the machine head, the telescopic cylinder 3 drives the core shaft to extend until the core shaft can limit the movement of the steel bars. It is used to cooperate with the first bending cylinder 1 and the second bending cylinder 2 to perform the operation of bending and hooping the steel bars.

[0049] The five clamping cylinders 4 are used to clamp the five machine heads respectively. Before bending the steel bars, the position of the machine heads is adjusted according to the length of the steel bars that need to be bent. At this time, the output end of the clamping cylinder 4 is in a shortened state and the position of the machine heads can be moved. After the machine head position adjustment is completed and bending operation is required, the output end of the clamping cylinder 4 is extended until the machine heads are locked and cannot be moved.

[0050] See also Figure 2 , the first oil supply mechanism is used to supply oil to the two first bending cylinders 1 and the five telescopic cylinders 3; please refer to Figure 3 The second oil supply mechanism is used to supply oil to the three second bending oil cylinders 2 and the five clamping oil cylinders 4. The five telescopic oil cylinders 3 are each connected to the first oil supply mechanism through a first valve; the five clamping oil cylinders 4 are connected to the second oil cylinders through a second valve.

[0051] Since the working states of the five-head hoop bending machine include using only two heads for hoop bending operations, and more than two (such as five) heads for successive hoop bending operations, the two first bending cylinders 1 are supplied with oil separately through the first oil supply mechanism, and the three second bending cylinders 2 are supplied with oil separately through the second oil supply mechanism. In this way, the two first bending cylinders 1 can be controlled separately, and the three second bending cylinders 2 can be controlled separately.

[0052] If only two machine heads are used for the hoop bending operation, after the position adjustment of the machine heads is completed and the machine heads are clamped, only the first oil supply mechanism can perform the oil supply operation. When the first oil supply mechanism performs the oil supply operation, the two first bending cylinders 1 operate synchronously; in addition, since the five telescopic cylinders 3 are respectively connected to the first oil supply mechanism through a first valve, therefore, when only the two first bending cylinders 1 are operating, only the first valves of the two telescopic cylinders 3 corresponding to the first bending cylinders 1 can be opened, so that the first oil supply mechanism can supply oil to the two telescopic cylinders 3 separately to cooperate with the two first bending cylinders 1 to operate.

[0053] If the five machine heads perform bending hoop operations successively, after the position adjustment of the machine heads is completed and the machine heads are clamped, the first oil supply mechanism and the second oil supply mechanism are started successively according to the progress of the steel bar bending. First, the first oil supply mechanism performs the oil supply operation, and the two first bending cylinders 1 work synchronously. At this time, only the first valves of the two telescopic cylinders 3 corresponding to the first bending cylinders 1 are opened, so that the first oil supply mechanism can supply oil to the two telescopic cylinders 3 separately to cooperate with the two first bending cylinders 1 to work; after completing the bending of both ends of the steel bar, the second oil supply mechanism is started. When the second oil supply mechanism performs the oil supply operation, the three second bending cylinders 2 work synchronously. At this time, only the first valves of the three telescopic cylinders 3 corresponding to the second bending cylinders 2 are opened, so that the first oil supply mechanism can supply oil to the three telescopic cylinders 3 separately to cooperate with the three second bending cylinders 2 to work.

[0054] Since the five clamping oil cylinders 4 are connected to the second oil cylinder via a second valve, when the second oil supply mechanism is started, as long as the second valve is opened, the five clamping oil cylinders 4 can be driven to lock the five machine heads respectively.

[0055] In a further embodiment, the first oil supply mechanism includes a first oil pump 5 and a first oil tank 7. Oil is stored in the first oil tank 7. The oil inlet of the first oil pump 5 is connected to the first oil tank 7. Specifically, the first oil pump 5 is driven by the first motor 6. When the first motor 6 is started, the first oil pump 5 can work to extract the oil in the first oil tank 7 to each oil circuit; the oil inlets of the first bending oil cylinder 1 and the first valve are connected to the oil outlet of the first oil pump 5. Specifically, they are connected through oil pipes. The oil circuit connected to the oil outlet of the first oil pump 5 is the main oil circuit, and the oil circuit connected to the main oil circuit by the first bending oil cylinder 1 and the first valve is the branch oil circuit. Each branch oil circuit is connected to the main oil circuit through an oil distributor.

[0056] Similarly, the second oil supply mechanism includes a second oil pump 8 and a second oil tank 10. The second oil tank 10 also stores oil. The oil inlet of the second oil pump 8 is connected to the second oil tank 10. Specifically, the second oil pump 8 is driven by the second motor 9. When the second motor 9 is started, the second oil pump 8 can work to extract the oil in the second oil tank 10 to each oil circuit. The second oil tank can be the same oil tank as the first oil tank, that is, the first oil pump and the second oil pump share the same oil tank; the oil inlets of the second bending oil cylinder 2 and the second valve are connected to the oil outlet of the second oil pump 8, specifically, they are connected through oil pipes. The oil circuit connected to the oil outlet of the second oil pump 8 is the main oil circuit, and the oil circuit connected to the main oil circuit by the second bending oil cylinder 2 and the second valve is the branch oil circuit. Each branch oil circuit is connected to the main oil circuit through an oil distributor.

[0057] In a certain embodiment, the oil outlet of the first oil pump 5 is provided with a first main oil circuit pressure regulating valve 11 and a first main valve 12 in sequence; the first main oil circuit pressure regulating valve 11 is used to adjust the pressure of the oil pumped by the first oil pump 5 to avoid damage to the oil pipe or other components receiving the oil; the first main valve 12 is used to open or close the main oil circuit of the first oil pump 5. The oil outlet of the first oil pump 5 is connected to the oil inlet of the first main oil circuit pressure regulating valve 11, the oil outlet of the first injection oil circuit pressure regulating valve is connected to the P interface of the first main valve 12, and the A interface of the main valve of the first oil pump 5 is connected to the oil inlet of the first bending oil cylinder 1 and the first valve.

[0058] The oil outlet of the second oil pump 8 is provided with a second main oil circuit pressure regulating valve 13 and a first main valve 12 in sequence; the second main oil circuit pressure regulating valve 13 is used to adjust the pressure of the oil pumped by the second oil pump 8 to avoid damage to the oil pipe or other components receiving the oil; the second main valve 14 is used to open or close the main oil circuit of the second oil pump 8. The oil outlet of the second oil pump 8 is connected to the oil inlet of the second main oil circuit pressure regulating valve 13, the oil outlet of the second injection oil circuit pressure regulating valve is connected to the P interface of the second main valve 14 and the oil inlet of the second valve, and the A interface of the main valve of the second oil pump 8 is connected to the second bending cylinder 2.

[0059] In order to achieve both the extension and the shortening of the output end of the first bending oil cylinder 1 through the oil, so as to achieve the forward rotation and the rotation of the bending disk, in a further embodiment, each first bending oil cylinder 1 is connected to the first oil supply mechanism through a first bending electromagnetic reversing valve 15, and the first bending electromagnetic reversing valve 15 is used to change the direction in which the first oil supply mechanism supplies oil to the first bending oil cylinder 1. Specifically, the P interface of the first bending electromagnetic reversing valve 15 is connected to the oil outlet of the first oil pump 5, and the T interface of the first bending electromagnetic reversing valve 15 is connected to the first oil tank 7, wherein the T interface of the first bending electromagnetic reversing valve 15 can be connected to one first oil tank 7 together with the oil inlet of the first oil pump 5, or the first oil tank 7 can be provided with two, and the T interface of the first bending electromagnetic reversing valve 15 can be connected to the oil inlet of the first oil pump 5 respectively with the two first oil tanks 7; the A interface and the B interface of the first bending electromagnetic reversing valve 15 are respectively connected to the rodless cavity and the rod cavity of the first bending oil cylinder 1.

[0060] When the output end of the first bending oil cylinder 1 needs to be extended, the direction in which the first oil supply mechanism supplies oil to the first bending oil cylinder 1 is: the oil drawn by the first oil pump 5 enters from the P interface to the A interface, and then enters the rodless cavity of the first bending oil cylinder 1 through the A interface. During this process, the oil in the rod cavity of the first bending oil cylinder 1 flows to the B interface under the squeeze of the oil in the rodless cavity, and then enters the T interface from the B interface, and finally flows back to the first oil tank 7 from the T interface. When the output end of the first bending oil cylinder 1 needs to be shortened, the direction in which the first oil supply mechanism supplies oil to the first bending oil cylinder 1 is: the oil drawn by the first oil pump 5 enters from the P interface to the B interface, and then enters the rod cavity of the first bending oil cylinder 1 through the B interface. During this process, the oil in the rodless cavity of the first bending oil cylinder 1 flows to the A interface under the squeeze of the oil in the rod cavity, and then enters the T interface from the A interface, and finally flows back to the first oil tank 7 from the T interface.

[0061] In order to enable the two telescopic cylinders 3 corresponding to the two first bending cylinders 1 to work with the two first bending cylinders 1, in a further embodiment, the B interfaces of the two first bending solenoid reversing valves 15 are also connected to the two telescopic cylinders 3 respectively.

[0062] In a further embodiment, the first valve is a cartridge valve 18, which is used to realize the opening or closing of the oil circuit. In addition, in order to realize the extension of the output end of the telescopic oil cylinder 3 and the shortening of the output end of the rope oil cylinder through oil, a telescopic electromagnetic reversing valve 16 is also included; the P interface of the telescopic electromagnetic reversing valve 16 is connected to the oil outlet of the first oil pump 5, and the T interface of the telescopic electromagnetic reversing valve 16 is connected to the first oil tank 7. Similarly, the T interface of the telescopic electromagnetic reversing valve 16 can be connected to one first oil tank 7 together with the oil inlet of the first oil pump 5, or the first oil tank 7 can be provided with two, and the T interface of the telescopic electromagnetic reversing valve 16 can be connected to the oil inlet of the first oil pump 5 and the two first oil tanks 7 respectively; the A interface of the telescopic electromagnetic reversing valve 16 is connected to the rod chambers of the five telescopic oil cylinders 3; the B interface of the telescopic electromagnetic reversing valve 16 is connected to the rodless chambers of the five telescopic oil cylinders 3; the cartridge valve 18 is located at the oil circuit where the rodless chamber of the telescopic oil cylinder 3 is connected to the B interface of the telescopic electromagnetic reversing valve 16.

[0063] Similarly, when the output end of the telescopic oil cylinder 3 needs to be shortened, the direction in which the first oil supply mechanism supplies oil to the telescopic oil cylinder 3 is: the oil drawn by the first oil pump 5 enters from the P interface to the A interface, and then enters the rod cavity of the telescopic oil cylinder 3 through the A interface. During this process, the oil in the rodless cavity of the telescopic oil cylinder 3 flows to the B interface under the squeezing action of the oil in the rod cavity, and then enters the T interface from the B interface, and finally flows back to the first oil tank 7 from the T interface. When the output end of the first bending oil cylinder 1 needs to be extended, the direction in which the first oil supply mechanism supplies oil to the telescopic oil cylinder 3 is: the oil drawn by the first oil pump 5 enters from the P interface to the B interface, and then enters the rodless cavity of the telescopic oil cylinder 3 through the B interface. During this process, the oil in the rod cavity of the telescopic oil cylinder 3 flows to the A interface under the squeezing action of the oil in the rodless cavity, and then enters the T interface from the A interface, and finally flows back to the first oil tank 7 from the T interface.

[0064] In a further embodiment, a superimposed pressure reducing valve 17 is further provided at the oil circuit connecting the rodless chamber of each telescopic oil cylinder 3 and the B interface of the telescopic electromagnetic reversing valve 16 .

[0065] In order to achieve both the extension and the shortening of the output end of the second bending oil cylinder 2 by the oil, so as to achieve the forward rotation and the rotation of the bending disk, in a further embodiment, each second bending oil cylinder 2 is connected to the second oil supply mechanism through a second bending electromagnetic reversing valve 19, and the second bending electromagnetic reversing valve 19 is used to change the direction in which the second oil supply mechanism supplies oil to the second bending oil cylinder 2. Specifically, the P interface of the second bending electromagnetic reversing valve 19 is connected to the oil outlet of the second oil pump 8, and the T interface of the second bending electromagnetic reversing valve 19 is connected to the second oil tank 10; wherein, the T interface of the second bending electromagnetic reversing valve 19 can be connected to one second oil tank 10 together with the oil inlet of the second oil pump 8, or two second oil tanks 10 can be provided, and the T interface of the second bending electromagnetic reversing valve 19 can be connected to the oil inlet of the second oil pump 8 and the two second oil tanks 10 respectively; the A interface and the B interface of the second bending electromagnetic reversing valve 19 are respectively connected to the rodless cavity and the rod cavity of the second bending oil cylinder 2.

[0066] Similarly, when the output end of the second bending oil cylinder 2 needs to be extended, the direction in which the second oil supply mechanism supplies oil to the second bending oil cylinder 2 is: the oil pumped by the second oil pump 8 enters from the P interface to the A interface, and then enters the rodless cavity of the first bending oil cylinder 1 through the A interface. During this process, the oil in the rod cavity of the first bending oil cylinder 1 flows to the B interface under the squeeze of the oil in the rodless cavity, and then enters the T interface from the B interface, and finally flows back to the second oil tank 10 from the T interface. When the output end of the second bending oil cylinder 2 needs to be shortened, the direction in which the second oil supply mechanism supplies oil to the second bending oil cylinder 2 is: the oil pumped by the second oil pump 8 enters from the P interface to the B interface, and then enters the rod cavity of the second bending oil cylinder 2 through the B interface. During this process, the oil in the rodless cavity of the second bending oil cylinder 2 flows to the A interface under the squeeze of the oil in the rod cavity, and then enters the T interface from the A interface, and finally flows back to the second oil tank 10 from the T interface.

[0067] In order to enable the three telescopic cylinders 3 corresponding to the three second bending cylinders 2 to work with the three second bending cylinders 2, in a further embodiment, the B interfaces of the three second bending solenoid reversing valves 19 are also connected to the three telescopic cylinders 3 respectively.

[0068] In a further embodiment, a one-way throttle valve 20 is provided at the oil circuit connecting the rodless chambers of the two second bending oil cylinders 2 and the A interface of the second bending electromagnetic reversing valve 19 .

[0069] In a further embodiment, a return elastic member is provided in the rod cavity of the clamping oil cylinder 4, which can be a wave spring; the second valve is a clamping control valve 21, and the rodless cavities of the five clamping oil cylinders 4 are all connected to the clamping control valve 21. When the clamping control valve 21 is powered on, oil pressure is provided, and the output ends of the five clamping oil cylinders 4 are extended to the locking machine head. In this process, the wave spring is deformed and compressed; when the clamping control valve 21 is powered off, there is no oil pressure, the wave spring is deformed and restored, the output ends of the five clamping oil cylinders 4 are shortened, and the hydraulic oil flows back.

[0070] It should be noted that, although the above embodiments have been described in this article, the patent protection scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present invention specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the patent protection scope of the present invention.

Claims

1. A hydraulic system for a five-head hoop bending machine, characterized in that: It includes two first bending oil cylinders, three second bending oil cylinders, five telescopic oil cylinders, five pressing oil cylinders, a first oil supply mechanism and a second oil supply mechanism; The first oil supply mechanism is used to supply oil to the two first bending oil cylinders and the five telescopic oil cylinders; the second oil supply mechanism is used to supply oil to the three second bending oil cylinders and the five pressing oil cylinders; The five telescopic oil cylinders are each connected to the first oil supply mechanism through a first valve; the five clamping oil cylinders are connected to the second oil supply mechanism through a second valve; The first oil supply mechanism includes a first oil pump and a first oil tank, the oil inlet of the first oil pump is connected to the first oil tank; the oil inlets of the first bending oil cylinder and the first valve are connected to the oil outlet of the first oil pump, each first bending oil cylinder is connected to the first oil supply mechanism through a first bending electromagnetic reversing valve, and the B interfaces of the two first bending electromagnetic reversing valves are respectively connected to the two telescopic oil cylinders; The second oil supply mechanism includes a second oil pump and a second oil tank, the oil inlet of the second oil pump is connected to the second oil tank; the oil inlets of the second bending oil cylinder and the second valve are connected to the oil outlet of the second oil pump, and each second bending oil cylinder is connected to the second oil supply mechanism through a second bending electromagnetic reversing valve; A return elastic member is arranged in the rod chamber of the clamping oil cylinder; the second valve is a clamping control valve, and the rodless chambers of the five clamping oil cylinders are all connected to the clamping control valve; It also includes a telescopic electromagnetic reversing valve, whose A interface is connected to the rod chambers of five telescopic oil cylinders; the B interface of the telescopic electromagnetic reversing valve is connected to the rodless chambers of five telescopic oil cylinders; and the B interfaces of the three second bending electromagnetic reversing valves are respectively connected to the three telescopic oil cylinders.

2. The hydraulic system of the five-head hoop bender according to claim 1, characterized in that: The oil outlet of the first oil pump is provided with a first main oil circuit pressure regulating valve and a first main valve in sequence; the oil outlet of the first oil pump is connected to the oil inlet of the first main oil circuit pressure regulating valve, the oil outlet of the first main oil circuit pressure regulating valve is connected to the P interface of the first main valve, and the A interface of the first main valve is connected to the first bending oil cylinder and the oil inlet of the first valve; The oil outlet hole of the second oil pump is sequentially provided with a second main oil circuit pressure regulating valve and a second main valve; the oil outlet hole of the second oil pump is connected to the oil inlet hole of the second main oil circuit pressure regulating valve, the oil outlet hole of the second main oil circuit pressure regulating valve is connected to the P interface of the second main valve and the oil inlet of the second valve, and the A interface of the second main valve is connected to the second bending cylinder.

3. The hydraulic system of the five-head hoop bender according to claim 1, characterized in that: The P interface of the first bending solenoid reversing valve is connected to the oil outlet of the first oil pump, and the T interface of the first bending solenoid reversing valve is connected to the first oil tank; the A interface and B interface of the first bending solenoid reversing valve are respectively connected to the rodless chamber and the rod chamber of the first bending oil cylinder.

4. The hydraulic system of the five-head hoop bender according to claim 1, characterized in that: The first valve is a cartridge valve.

5. The hydraulic system of the five-head hoop bender according to claim 4, characterized in that: The P interface of the telescopic electromagnetic reversing valve is connected to the oil outlet of the first oil pump, and the T interface of the telescopic electromagnetic reversing valve is connected to the first oil tank; the cartridge valve is located at the oil circuit where the rodless chamber of the telescopic oil cylinder is connected to the B interface of the telescopic electromagnetic reversing valve.

6. The hydraulic system of the five-head hoop bender according to claim 1, characterized in that: The P interface of the second bending solenoid reversing valve is connected to the oil outlet hole of the second oil pump, and the T interface of the second bending solenoid reversing valve is connected to the second oil tank; the A interface and B interface of the second bending solenoid reversing valve are respectively connected to the rodless chamber and rod chamber of the second bending oil cylinder.

7. The hydraulic system of the five-head hoop bender according to claim 6, characterized in that: One-way throttle valves are arranged at the oil circuits connecting the rodless chambers of the two second bending oil cylinders and the A interface of the second bending electromagnetic reversing valve.

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