A hydraulic control system and method for a double bale press and a bale press

Abstract

The present application relates to a kind of hydraulic control system of double bale bundling machine, hydraulic control method and bundling machine, and the hydraulic control system of double bale bundling machine includes oil tank, oil inlet, first oil cylinder, second left cylinder, second right cylinder, third left cylinder, third right cylinder, three reversing valves, first oil cylinder is bidirectional oil cylinder, oil inlet is connected with each reversing valve respectively by oil inlet pipeline, and oil tank is connected with each reversing valve respectively by oil return pipeline;First reversing valve is communicated with the left cavity and right cavity of first oil cylinder respectively by first pipeline A and first pipeline B, second reversing valve is communicated with the rodless cavity of second left cylinder and the rodless cavity of second right cylinder respectively by second pipeline A and second pipeline B, the rod cavity of second left cylinder and the rod cavity of second right cylinder are communicated by second pipeline C;Third reversing valve is communicated with the rodless cavity of third left cylinder and the rodless cavity of third right cylinder respectively by third pipeline A and third pipeline B, the rod cavity of third left cylinder and the rod cavity of third right cylinder are communicated by third pipeline C.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural machinery, and particularly relates to a double-bale baling machine hydraulic control system, a hydraulic control method and the baling machine. BACKGROUND

[0002] The existing baling machine hydraulic system is generally used for single-bale machines, and the baling machine hydraulic system for double-bale machines generally uses two groups of valves to control the bale ejection actions on both sides, which is complex to operate and slow in bale ejection action. SUMMARY

[0003] The present application provides a double-bale baling machine hydraulic control system, a hydraulic control method and the baling machine to solve one or several technical problems existing in the prior art.

[0004] The technical scheme for solving the above technical problems is as follows: the present application provides a double-bale baling machine hydraulic control system, which comprises an oil tank, an oil inlet, a first oil cylinder, a second left cylinder, a second right cylinder, a third left cylinder, a third right cylinder, a first reversing valve, a second reversing valve and a third reversing valve, the first oil cylinder is a bidirectional oil cylinder, the oil inlet is connected with the first reversing valve, the second reversing valve and the third reversing valve through oil inlet pipelines, and the oil tank is connected with the first reversing valve, the second reversing valve and the third reversing valve through oil return pipelines; the first reversing valve is communicated with the left cavity and the right cavity of the first oil cylinder through a first pipeline A and a first pipeline B, the second reversing valve is communicated with the rodless cavity of the second left cylinder and the rodless cavity of the second right cylinder through a second pipeline A and a second pipeline B, and the rod cavity of the second left cylinder and the rod cavity of the second right cylinder are communicated through a second pipeline C; the third reversing valve is communicated with the rodless cavity of the third left cylinder and the rodless cavity of the third right cylinder through a third pipeline A and a third pipeline B, and the rod cavity of the third left cylinder and the rod cavity of the third right cylinder are communicated through a third pipeline C.

[0005] The double-bale baling machine hydraulic control system has the beneficial effects that the rod cavity of the second left cylinder and the rod cavity of the second right cylinder are communicated through the second pipeline C, the rod cavity of the third left cylinder and the rod cavity of the third right cylinder are communicated through the third pipeline C, the second left cylinder and the second right cylinder are connected in series, the third left cylinder and the third right cylinder are connected in series, the two oil cylinders connected in series can act simultaneously, the action is faster than that of the individual control of the oil cylinders, and the operation is simpler.

[0006] On the basis of the above technical scheme, the present application can also be improved as follows.

[0007] Further, the first electromagnetic ball valve and the second electromagnetic ball valve are further included, the oil inlet is connected with the second pipeline C through a first oil supplement pipeline, and the first electromagnetic ball valve is arranged on the first oil supplement pipeline; the oil inlet is connected with the third pipeline C through a second oil supplement pipeline, and the second electromagnetic ball valve is arranged on the second oil supplement pipeline.

[0008] The beneficial effect of the further scheme is that two electromagnetic ball valves are arranged, and the second left cylinder, the second right cylinder, the third left cylinder and the third right cylinder can be supplemented with oil under necessary conditions.

[0009] Further, the first oil supplement pipeline between the first electromagnetic ball valve and the second pipeline C is connected with a first overflow pipeline, the first overflow pipeline is arranged with a first overflow valve, and the first overflow pipeline is communicated with the oil tank; the second oil supplement pipeline between the second electromagnetic ball valve and the third pipeline C is connected with a second overflow pipeline, the second overflow pipeline is arranged with a second overflow valve, and the second overflow pipeline is communicated with the oil tank.

[0010] The beneficial effect of the further scheme is that the overflow pipeline and the overflow valve are arranged, and the overpressure overflow in the oil supplement process can be realized.

[0011] Further, the fourth reversing valve is further included, the oil inlet is connected with the fourth reversing valve through a standby oil circuit, the oil tank is connected with the fourth reversing valve through an oil return pipeline, and the fourth reversing valve is communicated with the left cavity and the right cavity of the first oil cylinder through the fourth pipeline A and the fourth pipeline B.

[0012] The oil inlet includes a first oil inlet, a second oil inlet and a third oil inlet, the first oil inlet, the second oil inlet and the third oil inlet are connected with the first reversing valve, the second reversing valve and the third reversing valve respectively after converging through an oil inlet pipeline, and the second oil inlet is connected with the fourth reversing valve through a standby oil circuit.

[0013] The beneficial effect of the further scheme is that the fourth reversing valve is arranged as a standby reversing valve, and the pressure for the first oil cylinder is provided when the left side does not completely execute the program, the third left cylinder does not enter the stop position, the third right cylinder does not retreat the stop position, and the three cylinders are still moving, and the system pressure is high, and the first oil cylinder needs low pressure to move to the right.

[0014] Further, the oil inlet includes a first oil inlet, a second oil inlet and a third oil inlet, the first oil inlet, the second oil inlet and the third oil inlet are connected with the first reversing valve, the second reversing valve and the third reversing valve respectively after converging through an oil inlet pipeline, and the second oil inlet is connected with the fourth reversing valve through a standby oil circuit.

[0015] The beneficial effect of adopting the further scheme is that: by setting three oil inlets, and connecting the second oil inlet with the fourth reversing valve through the standby oil line, low-pressure hydraulic oil can be provided for the first oil cylinder through the fourth reversing valve.

[0016] Further, the first oil cylinder is provided with a left limit sensor and a right limit sensor on both sides of the running direction; the second left cylinder is provided with an advance limit sensor and a retreat limit sensor on both sides of the running direction; the second right cylinder is provided with an advance limit sensor and a retreat limit sensor on both sides of the running direction; the third left cylinder is provided with an advance limit sensor and a retreat limit sensor on both sides of the running direction; and the third right cylinder is provided with an advance limit sensor and a retreat limit sensor on both sides of the running direction.

[0017] The beneficial effect of adopting the further scheme is that: by setting the limit sensor, the running position of each oil cylinder can be sensed.

[0018] The application further provides a hydraulic control method, which is realized by using the above-mentioned hydraulic control system of the double-bale-out baling machine, and comprises the following steps.

[0019] Initial state: the first oil cylinder is in the right position, the second left cylinder and the third left cylinder are in the retreat limit position, and the second right cylinder and the third right cylinder are in the advance limit position.

[0020] The first reversing valve, the second reversing valve and the third reversing valve are in the middle closed state.

[0021] When the first bale-out port of the double-bale-out baling machine reaches the bale-out condition:

[0022] The first reversing valve core moves left, and the hydraulic oil at the oil inlet enters the right cavity of the first oil cylinder through the first reversing valve from the first pipeline B, so that the first oil cylinder moves left, and the hydraulic oil in the left cavity of the first oil cylinder returns to the tank through the first reversing valve from the first pipeline A;

[0023] The second reversing valve core moves right, and the hydraulic oil at the oil inlet enters the rodless cavity of the second left cylinder through the second reversing valve from the second pipeline B, so that the second left cylinder moves down, and since the rod cavity of the second left cylinder and the rod cavity of the second right cylinder are connected, the second right cylinder moves up at the same time, and the hydraulic oil in the rodless cavity of the second right cylinder returns to the tank through the second reversing valve from the second pipeline B;

[0024] The third reversing valve core moves right, and the hydraulic oil at the oil inlet enters the rodless cavity of the third left cylinder through the third reversing valve from the third pipeline A, so that the third left cylinder moves forward, and since the rod cavities of the third left cylinder and the third right cylinder are connected, the third right cylinder moves backward at the same time, so that the hydraulic oil in the rodless cavity of the third right cylinder returns to the tank through the third reversing valve from the third pipeline B;

[0025] When the second bale-out port of the double-bale-out baling machine reaches the bale-out condition:

[0026] At this time, if the second right cylinder reaches the advanced position, the first directional valve spool moves right, and the hydraulic oil at the inlet port enters the left chamber of the first oil cylinder through the first directional valve through the first pipeline A, so that the first oil cylinder moves right, and the hydraulic oil in the right chamber of the first oil cylinder returns to the tank through the first pipeline B through the first directional valve;

[0027] The second directional valve spool moves left, and the hydraulic oil at the inlet port enters the rodless chamber of the second right cylinder through the second directional valve through the second pipeline B, so that the second right cylinder moves down, and since the rod chambers of the second left cylinder and the second right cylinder are communicated, the second left cylinder moves up at the same time, and the hydraulic oil in the rodless chamber of the second left cylinder returns to the tank through the second pipeline A through the second directional valve;

[0028] The third directional valve spool moves left, and the hydraulic oil at the inlet port enters the rodless chamber of the third right cylinder through the third directional valve through the third pipeline B, so that the third right cylinder moves forward, and since the rod chambers of the third left cylinder and the third right cylinder are communicated, the third left cylinder moves backward at the same time, so that the hydraulic oil in the rodless chamber of the third left cylinder returns to the tank through the third pipeline A through the third directional valve.

[0029] The hydraulic control method of the present application can realize stable and rapid double-bale-out operation.

[0030] The present application also provides a hydraulic control method, which is realized by using the above-mentioned double-bale-out baler hydraulic control system, and comprises the following steps:

[0031] Initial state: the first oil cylinder is in the right position, the second left cylinder and the third left cylinder are in the retracted position, and the second right cylinder and the third right cylinder are in the advanced position;

[0032] The first directional valve, the second directional valve and the third directional valve are in the middle closed state;

[0033] When the first bale-out port of the double-bale-out baler reaches the bale-out condition:

[0034] The first directional valve spool moves left, and the hydraulic oil at the inlet port enters the right chamber of the first oil cylinder through the first directional valve through the first pipeline B, so that the first oil cylinder moves left, and the hydraulic oil in the left chamber of the first oil cylinder returns to the tank through the first pipeline A through the first directional valve;

[0035] The second directional valve spool moves right, and the hydraulic oil at the inlet port enters the rodless chamber of the second left cylinder through the second directional valve through the second pipeline B, so that the second left cylinder moves down, and since the rod chambers of the second left cylinder and the second right cylinder are communicated, the second right cylinder moves up at the same time, and the hydraulic oil in the rodless chamber of the second right cylinder returns to the tank through the second pipeline B through the second directional valve;

[0036] The valve core of the third directional valve moves to the right, and the hydraulic oil at the inlet enters the rodless chamber of the third left cylinder through the third pipeline A via the third directional valve, causing the third left cylinder to move forward. Since the rod chambers of the third left cylinder and the third right cylinder are connected, the third right cylinder moves backward at the same time, allowing the hydraulic oil in its rodless chamber to return to the oil tank through the third pipeline B via the third directional valve.

[0037] When the second outlet of the double-outlet baler meets the outlet conditions:

[0038] At this time, if a signal is issued for the second right cylinder to retract to the stop position, and both the third left cylinder and the third right cylinder are in position, the valve core of the first directional valve moves to the right, and the hydraulic oil at the inlet enters the left chamber of the first cylinder through the first directional valve and the first pipeline A, causing the first cylinder to move to the right. The hydraulic oil in the right chamber of the first cylinder returns to the oil tank through the first pipeline B and the first directional valve. If a signal is issued for the second right cylinder to retract to the stop position, and neither the third left cylinder nor the third right cylinder is in position, both the third left cylinder and the third right cylinder are in operation. The valve core of the fourth directional valve moves to the right, and the hydraulic oil at the inlet enters the left chamber of the first cylinder through the fourth directional valve and the fourth pipeline A, causing the first cylinder to move to the right. The hydraulic oil in the right chamber of the first cylinder returns to the oil tank through the fourth pipeline B and the first directional valve.

[0039] The valve core of the second directional valve moves to the left, and the hydraulic oil at the inlet enters the rodless chamber of the second right cylinder through the second pipeline B via the second directional valve, causing the second right cylinder to move downward. Since the rod chambers of the second left cylinder and the second right cylinder are connected, the second left cylinder moves upward at the same time. The hydraulic oil in the rodless chamber of the second left cylinder returns to the oil tank through the second pipeline A and the second directional valve.

[0040] The valve core of the third directional valve moves to the left, and the hydraulic oil at the inlet enters the rodless chamber of the third right cylinder through the third pipeline B via the third directional valve, causing the third right cylinder to move forward. Since the rod chambers of the third left cylinder and the third right cylinder are connected, the third left cylinder moves backward at the same time, allowing the hydraulic oil in its rodless chamber to return to the oil tank through the third pipeline A via the third directional valve.

[0041] The beneficial effects of the present invention are as follows: In the hydraulic control method of the present invention, when the left side has not fully executed the program, that is, when the third left cylinder has not reached the forward stop position and the third right cylinder has not reached the retracted stop position, the three cylinders are still moving and the system pressure is high. However, the first cylinder needs lower pressure to move to the right. In order to solve the problem that the high and low pressure cannot work at the same time, the fourth directional valve, which serves as a backup directional valve, can be activated to provide pressure to the first cylinder.

[0042] This invention also provides a hydraulic control method, implemented using the aforementioned hydraulic control system for a double-outlet baler, comprising the following steps:

[0043] Initial state: The first cylinder is in the right position, the second and third left cylinders are in the retracted position, and the second and third right cylinders are in the forward position.

[0044] The first reversing valve, the second reversing valve and the third reversing valve are in the neutral closed state;

[0045] When the first bale outlet of the double-bale baling machine reaches the baling condition:

[0046] The first reversing valve spool moves left, and the hydraulic oil at the oil inlet enters the right cavity of the first oil cylinder through the first reversing valve from the first pipeline B, so that the first oil cylinder moves left, and the hydraulic oil in the left cavity of the first oil cylinder returns to the tank through the first reversing valve from the first pipeline A; after the first oil cylinder moves left to the left limit sensor, the first reversing valve spool returns to the neutral position, and the first reversing valve is closed;

[0047] The second reversing valve spool moves right, and the hydraulic oil at the oil inlet enters the rodless cavity of the second left cylinder through the second reversing valve from the second pipeline B, so that the second left cylinder moves down, and the second right cylinder moves up at the same time due to the communication between the rod cavities of the second left cylinder and the second right cylinder; the hydraulic oil in the rodless cavity of the second right cylinder returns to the tank through the second reversing valve from the second pipeline B; after the second left cylinder limit sensor sends a signal, if the second right cylinder limit sensor also sends a signal, the second reversing valve spool returns to the neutral position, and the second reversing valve is closed; if the second right cylinder limit sensor does not send a signal, the first electromagnetic ball valve is opened, and the second left cylinder and the second right cylinder are started to be filled with oil until the second right cylinder limit sensor also sends a signal, the second reversing valve is closed, the first electromagnetic ball valve is connected in parallel with the first overflow valve, and the pressure is overflowed;

[0048] The third reversing valve spool moves right, and the hydraulic oil at the oil inlet enters the rodless cavity of the third left cylinder through the third reversing valve from the third pipeline A, so that the third left cylinder moves forward, and the third right cylinder moves backward at the same time due to the communication between the rod cavities of the third left cylinder and the third right cylinder, so that the hydraulic oil in the rodless cavity of the third right cylinder returns to the tank through the third reversing valve from the third pipeline B; after the third left cylinder limit sensor sends a signal, if the third right cylinder limit sensor also sends a signal, the third reversing valve spool returns to the neutral position, and the third reversing valve is closed; if the third right cylinder limit sensor does not send a signal, the second electromagnetic ball valve is opened, and the third left cylinder and the third right cylinder are started to be filled with oil until the third right cylinder limit sensor also sends a signal, the third reversing valve is closed, the second electromagnetic ball valve is connected in parallel with the second overflow valve, and the pressure is overflowed;

[0049] When the second bale outlet of the double-bale baling machine reaches the baling condition:

[0050] At this time, if the second right cylinder limit sensor sends a signal, the first reversing valve spool moves right, and the hydraulic oil at the oil inlet enters the left cavity of the first oil cylinder through the first reversing valve from the first pipeline A, so that the first oil cylinder moves right, and the hydraulic oil in the right cavity of the first oil cylinder returns to the tank through the first reversing valve from the first pipeline B; after the right limit sensor on the right side of the first oil cylinder sends a signal, the first reversing valve spool returns to the neutral position, and the first reversing valve is closed;

[0051] The second reversing valve spool moves left, and the hydraulic oil at the inlet port enters the rodless chamber of the second right cylinder through the second reversing valve from the second pipeline B, so that the second right cylinder is advanced, and the second left cylinder is retracted at the same time because the rod chambers of the second left cylinder and the second right cylinder are communicated, and the hydraulic oil in the rodless chamber of the second left cylinder returns to the tank through the second pipeline A and the second reversing valve; after the advance limit sensor of the second right cylinder sends a signal, if the second left cylinder also sends a signal, the second reversing valve spool returns to the center position, and the second reversing valve is closed; if the second left cylinder does not send a signal, the first electromagnetic ball valve is opened, and the second left cylinder and the second right cylinder are supplemented with oil until the second left cylinder also sends a signal, the second reversing valve is closed, the first electromagnetic ball valve is connected with the first overflow valve in parallel, and the pressure overflow is performed.

[0052] The third reversing valve spool moves left, and the hydraulic oil at the inlet port enters the rodless chamber of the third right cylinder through the third reversing valve from the third pipeline B, so that the third right cylinder is advanced, and the third left cylinder is retracted at the same time because the rod chambers of the third left cylinder and the third right cylinder are communicated, and the hydraulic oil in the rodless chamber of the third left cylinder returns to the tank through the third pipeline A and the third reversing valve; after the advance limit sensor of the third right cylinder sends a signal, if the third left cylinder also sends a signal, the third reversing valve spool returns to the center position, and the third reversing valve is closed; if the third left cylinder does not send a signal, the second electromagnetic ball valve is opened, and the third left cylinder and the third right cylinder are supplemented with oil until the third left cylinder also sends a signal, the third reversing valve is closed, the second electromagnetic ball valve is connected with the second overflow valve in parallel, and the pressure overflow is performed.

[0053] The hydraulic control method has the beneficial effects that the action of each sensor is used to sense whether the oil cylinder is in position, and the smooth and stable hydraulic control process is controlled.

[0054] Further, the initial state is replaced by the first oil cylinder being in the left position, the second right cylinder and the third right cylinder being in the retracted limit position, and the second left cylinder and the third left cylinder being in the advanced limit position; when the first bale outlet of the double-bale baling machine reaches the bale-out condition or the second bale outlet of the double-bale baling machine reaches the bale-out condition, the opposite control process is adopted.

[0055] The application further provides a baling machine comprising the double-bale baling machine hydraulic control system.

[0056] The baling machine has the beneficial effects that the baling action is faster, and the operation is simpler. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 It is a schematic diagram of the double-bale baling machine hydraulic control system;

[0058] Figure 2 It is a schematic diagram of the cylinder arrangement in the double-bale baling machine hydraulic control system.

[0059] The attached diagram lists the components represented by each number as follows:

[0060] 1. First hydraulic cylinder;

[0061] 2. Second left cylinder; 21. Second right cylinder;

[0062] 3. Third left cylinder; 31. Third right cylinder;

[0063] 4. First directional control valve; 41. Second directional control valve; 42. Third directional control valve; 43. Fourth directional control valve; 44. Oil inlet line; 45. Oil return line; 46. Backup oil line; 47. Third relief valve; 48. Fourth relief valve; 49. Fifth relief valve;

[0064] 5. First Pipeline A; 51. First Pipeline B; 52. Second Pipeline A; 53. Second Pipeline B; 54. Second Pipeline C; 55. Third Pipeline A; 56. Third Pipeline B; 57. Third Pipeline C; 58. Fourth Pipeline A; 59. Fourth Pipeline B;

[0065] 6. First solenoid ball valve; 61. Second solenoid ball valve; 62. First oil replenishment line; 63. Second oil replenishment line; 64. First relief valve; 65. Second relief valve; 66. First relief line; 67. Second relief line;

[0066] 7. Check valve; 8. Compression chamber. Detailed Implementation

[0067] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0068] This invention is based on Figure 2 The orientation of each cylinder is used as a reference to describe its arrangement and operation.

[0069] Example 1

[0070] like Figure 1 and Figure 2As shown, the hydraulic control system of the double-bale wrapping machine in the embodiment comprises an oil tank, an oil inlet, a first oil cylinder 1, a second left cylinder 2, a second right cylinder 21, a third left cylinder 3, a third right cylinder 31, a first reversing valve 4, a second reversing valve 41 and a third reversing valve 42, the first oil cylinder 1 is a bidirectional oil cylinder, the oil inlet is connected with the first reversing valve 4, the second reversing valve 41 and the third reversing valve 42 through an oil inlet pipeline 44, and the oil tank is connected with the first reversing valve 4, the second reversing valve 41 and the third reversing valve 42 through an oil return pipeline 45; the first reversing valve 4 is communicated with the left cavity and the right cavity of the first oil cylinder 1 through a first pipeline A5 and a first pipeline B51, the second reversing valve 41 is communicated with the rodless cavity of the second left cylinder 2 and the rodless cavity of the second right cylinder 21 through a second pipeline A52 and a second pipeline B53, and the rod cavity of the second left cylinder 2 is communicated with the rod cavity of the second right cylinder 21 through a second pipeline C54; the third reversing valve 42 is communicated with the rodless cavity of the third left cylinder 3 and the rodless cavity of the third right cylinder 31 through a third pipeline A55 and a third pipeline B56, and the rod cavity of the third left cylinder 3 is communicated with the rod cavity of the third right cylinder 31 through a third pipeline C57.

[0071] The embodiment can be provided with a one-way valve 7 on the pipeline where the oil inlet is located.

[0072] The hydraulic control system of the double-bale wrapping machine in the embodiment can realize the simultaneous action of the two oil cylinders in series by connecting the rod cavity of the second left cylinder and the rod cavity of the second right cylinder through the second pipeline C and connecting the rod cavity of the third left cylinder and the rod cavity of the third right cylinder through the third pipeline C, so that the second left cylinder and the second right cylinder are in series and the third left cylinder and the third right cylinder are in series, which can realize the simultaneous action of the two oil cylinders in series, and the action is faster and the operation is simpler compared with the separate control of the action of each oil cylinder.

[0073] Embodiment 2

[0074] Based on the embodiment 1, the embodiment provides a preferred scheme of the hydraulic control system. As shown in the figure, Figure 1 The hydraulic control system in the embodiment further comprises a first electromagnetic ball valve 6 and a second electromagnetic ball valve 61, the oil inlet is connected with and communicated with the second pipeline C54 through a first oil supplement pipeline 62, the first oil supplement pipeline 62 is provided with the first electromagnetic ball valve 6, and the oil inlet is connected with and communicated with the third pipeline C57 through a second oil supplement pipeline 63, and the second oil supplement pipeline 63 is provided with the second electromagnetic ball valve 61. By providing two electromagnetic ball valves, the second left cylinder, the second right cylinder, the third left cylinder and the third right cylinder can be supplemented with oil under necessary conditions.

[0075] Embodiment 3

[0076] Based on the embodiment 2, the embodiment provides a preferred scheme of the hydraulic control system. As shown in the figure, Figure 1As shown, the first oil supplement pipeline 62 between the first electromagnetic ball valve 6 and the second pipeline C54 of the embodiment is connected with a first overflow pipeline 66, the first overflow pipeline 66 is provided with a first overflow valve 64, and the first overflow pipeline 66 is communicated with the oil tank; the second oil supplement pipeline 63 between the second electromagnetic ball valve 61 and the third pipeline C57 is connected with a second overflow pipeline 67, the second overflow pipeline 67 is provided with a second overflow valve 65, and the second overflow pipeline 67 is communicated with the oil tank. By setting the overflow pipeline and the overflow valve, overpressure overflow during oil supplementing can be realized.

[0077] Embodiment 4

[0078] On the basis of any of the above embodiments, the embodiment further provides a preferred scheme of the hydraulic control system. As shown in Figure 1 As shown, the hydraulic control system of the embodiment further comprises a fourth directional valve 43, the oil inlet is connected with the fourth directional valve 43 through a standby oil line 46, the oil tank is connected with the fourth directional valve 43 through an oil return pipeline 45, and the fourth directional valve 43 is communicated with the left cavity and the right cavity of the first oil cylinder 1 through a fourth pipeline A58 and a fourth pipeline B59 respectively. The oil inlet comprises a first oil inlet, a second oil inlet and a third oil inlet, the first oil inlet, the second oil inlet and the third oil inlet are converged through an oil inlet pipeline 44 and then connected with the first directional valve 4, the second directional valve 41 and the third directional valve 42 respectively; the second oil inlet is connected with the fourth directional valve 43 through the standby oil line 46. By setting the fourth directional valve, when the left side does not completely execute the program, that is, the third left cylinder does not enter the stop position and the third right cylinder does not retreat the stop position, at this time, the three cylinders are still moving and the system pressure is high, and the first oil cylinder needs low pressure to move to the right, in order to solve the problem that high and low pressures cannot work at the same time, the fourth directional valve as a standby directional valve can be started to provide pressure for the first oil cylinder.

[0079] The embodiment provides a preferred setting scheme of the oil inlet. As shown in Figure 1 As shown, the oil inlet comprises a first oil inlet P1, a second oil inlet P2 and a third oil inlet P3, the first oil inlet P1, the second oil inlet P2 and the third oil inlet P3 are converged through an oil inlet pipeline 44 and then connected with the first directional valve 4, the second directional valve 41 and the third directional valve 42 respectively; the second oil inlet is connected with the fourth directional valve 43 through the standby oil line 46. By setting three oil inlets and connecting the second oil inlet with the fourth directional valve through the standby oil line, the fourth directional valve can be used to provide low-pressure hydraulic oil for the first oil cylinder.

[0080] Specifically, the first oil inlet P1, the second oil inlet P2 and the third oil inlet P3 can be respectively provided with an oil inlet pump for delivering hydraulic oil in the oil tank T to the hydraulic system; each branch oil circuit where the first oil inlet P1, the second oil inlet P2 and the third oil inlet P3 are located is respectively provided with a one-way valve 7; the first oil inlet P1, the second oil inlet P2 and the third oil inlet P3 are respectively connected with an oil return branch oil circuit connected with the oil tank T for returning oil; the oil return branch oil circuit where the first oil inlet P1, the second oil inlet P2 and the third oil inlet P3 are located is respectively provided with a third overflow valve 47, a fourth overflow valve 48 and a fifth overflow valve 49.

[0081] Embodiment 5

[0082] On the basis of any of the above embodiments, the embodiment provides a preferred scheme of a hydraulic control system. The first oil cylinder 1 is respectively provided with a left limit sensor and a right limit sensor on both sides of the running direction; the second left cylinder 2 is respectively provided with an in-limit sensor and an out-limit sensor on both sides of the running direction, and the second right cylinder 21 is respectively provided with an in-limit sensor and an out-limit sensor on both sides of the running direction; the third left cylinder 3 is respectively provided with an in-limit sensor and an out-limit sensor on both sides of the running direction, and the third right cylinder 31 is respectively provided with an in-limit sensor and an out-limit sensor on both sides of the running direction. By providing the limit sensor, the running position of each oil cylinder can be sensed.

[0083] In the embodiment, the left limit sensor, the right limit sensor, the in-limit sensor and the out-limit sensor all adopt the same sensor for the in-position control of each oil cylinder. Specifically, a magnet can be arranged on the head of the oil cylinder, and a corresponding limit sensor can be arranged on the frame fixed with the oil cylinder. When the limit sensor contacts the magnet, the oil cylinder is in position. If the limit sensor does not contact the magnet, the oil cylinder is not in position.

[0084] Embodiment 6

[0085] The hydraulic control method of the embodiment is realized by using the hydraulic control system of the double-bale wrapping machine of any of the above embodiments, and includes the following steps.

[0086] Initial state: the first oil cylinder 1 is in the right position, the second left cylinder 2 and the third left cylinder 3 are in the out-limit position, and the second right cylinder 21 and the third right cylinder 31 are in the in-limit position.

[0087] The first reversing valve 4, the second reversing valve 41 and the third reversing valve 42 are in the middle closed state.

[0088] When the first bale outlet (located on the left side) of the double-bale wrapping machine reaches the bale wrapping condition (i.e., the weighing sensor at the first bale outlet and located at the bottom of the compression chamber reaches the weight setting condition, and the left bale is compressed and wrapped): Figure 2 When the first bale outlet (located on the left side) of the double-bale wrapping machine reaches the bale wrapping condition (i.e., the weighing sensor at the first bale outlet and located at the bottom of the compression chamber reaches the weight setting condition, and the left bale is compressed and wrapped):

[0089] When the first reversing valve 4 spool moves to the left, the hydraulic oil at the inlet port enters the right cavity of the first oil cylinder 1 through the first reversing valve 4 from the first pipeline B51, so that the first oil cylinder 1 moves to the left, and the hydraulic oil in the left cavity of the first oil cylinder 1 returns to the tank through the first pipeline A5 and the first reversing valve 4;

[0090] When the second reversing valve 41 spool moves to the right, the hydraulic oil at the inlet port enters the rodless cavity of the second left cylinder 2 through the second reversing valve 41 from the second pipeline B53, so that the second left cylinder 2 moves downward, and the rodless cavity of the second right cylinder 21 returns to the tank through the second pipeline B53 and the second reversing valve 41, because the rod cavities of the second left cylinder 2 and the second right cylinder 21 are connected, the second right cylinder 21 moves upward at the same time;

[0091] When the third reversing valve 42 spool moves to the right, the hydraulic oil at the inlet port enters the rodless cavity of the third left cylinder 3 through the third reversing valve 42 from the third pipeline A55, so that the third left cylinder 3 moves forward (with the central position as the reference), and the rodless cavity of the third right cylinder 31 returns to the tank through the third pipeline B56 and the third reversing valve 42, because the rod cavities of the third left cylinder 3 and the third right cylinder 31 are connected, the third right cylinder 31 moves backward at the same time; Figure 2

[0092] When the second bale outlet (located on the right side) of the double-bale wrapping machine reaches the bale-out condition (i.e., the weighing sensor at the second bale outlet and located at the bottom of the compression cavity reaches the weight setting condition, and the right bale is compressed and wrapped): Figure 2 At this time, if the second right cylinder 21 moves backward and a signal is sent, the first reversing valve 4 spool moves to the right, the hydraulic oil at the inlet port enters the left cavity of the first oil cylinder 1 through the first reversing valve 4 from the first pipeline A5, so that the first oil cylinder 1 moves to the right, and the hydraulic oil in the right cavity of the first oil cylinder 1 returns to the tank through the first pipeline B51 and the first reversing valve 4;

[0093] The second reversing valve 41 spool moves to the left, the hydraulic oil at the inlet port enters the rodless cavity of the second right cylinder 21 through the second reversing valve 41 from the second pipeline B53, so that the second right cylinder 21 moves downward, and the rodless cavity of the second left cylinder 2 returns to the tank through the second pipeline A52 and the second reversing valve 41, because the rod cavities of the second left cylinder 2 and the second right cylinder 21 are connected, the second left cylinder 2 moves upward at the same time;

[0094] The third reversing valve 42 spool moves to the left, the hydraulic oil at the inlet port enters the rodless cavity of the third right cylinder 31 through the third reversing valve 42 from the third pipeline B56, so that the third right cylinder 31 moves forward, and the rodless cavity of the third left cylinder 3 returns to the tank through the third pipeline A55 and the third reversing valve 42, because the rod cavities of the third left cylinder 3 and the third right cylinder 31 are connected, the third left cylinder 3 moves backward at the same time.

[0095]

[0096] ​​The hydraulic control method in this embodiment can achieve stable and rapid double-packet ejection.

[0097] Example 7

[0098] This embodiment of a hydraulic control method, implemented using a double-outlet baler hydraulic control system from Embodiment 4 above, includes the following steps:

[0099] Initial state: First cylinder 1 is in the right position, second left cylinder 2 and third left cylinder 3 are in the retraction position, and second right cylinder 21 and third right cylinder 31 are in the forward position.

[0100] The first reversing valve 4, the second reversing valve 41, and the third reversing valve 42 are in the neutral closed state;

[0101] When the first outlet of the double-outlet baler (located at) Figure 2 The left side reaches the bale discharge condition (i.e., the weighing sensor at the first bale discharge port and located at the bottom of the compression chamber reaches the weight setting condition, compressing the bale on the left side):

[0102] The valve core of the first directional valve 4 moves to the left, and the hydraulic oil at the inlet enters the right chamber of the first cylinder 1 through the first pipeline B51 via the first directional valve 4, causing the first cylinder 1 to move to the left. The hydraulic oil in the left chamber of the first cylinder 1 returns to the oil tank through the first pipeline A5 and the first directional valve 4.

[0103] The valve core of the second directional valve 41 moves to the right, and the hydraulic oil at the oil inlet enters the rodless chamber of the second left cylinder 2 through the second pipeline B53 via the second directional valve 41, causing the second left cylinder 2 to move downward. Since the rod chamber of the second left cylinder 2 and the rod chamber of the second right cylinder 21 are connected, the second right cylinder 21 moves upward at the same time, and the hydraulic oil in the rodless chamber of the second right cylinder 21 returns to the oil tank through the second pipeline B53 and the second directional valve 41.

[0104] The valve core of the third directional valve 42 moves to the right, and the hydraulic oil at the inlet enters the rodless chamber of the third left cylinder 3 through the third pipeline A55 via the third directional valve 42, causing the third left cylinder 3 to move forward. Since the rod chambers of the third left cylinder 3 and the third right cylinder 31 are connected, the third right cylinder 31 moves backward at the same time, so that the hydraulic oil in its rodless chamber returns to the oil tank through the third pipeline B56 via the third directional valve 42.

[0105] When the second outlet of the double-outlet baler (located at) Figure 2 The right side reaches the bale discharge condition (i.e., the weighing sensor at the second bale discharge port and located at the bottom of the compression chamber reaches the weight setting condition, compressing the bale on the right side):

[0106] At this time, if the second right cylinder 21 retreats to the stop position and signals are sent, and the third left cylinder 3 and the third right cylinder 31 are both operated to the position, the first reversing valve 4 is moved to the right, and the hydraulic oil at the inlet is introduced into the left cavity of the first oil cylinder 1 through the first reversing valve 4 by the first pipeline A5, so that the first oil cylinder 1 is advanced to the right, and the hydraulic oil in the right cavity of the first oil cylinder 1 is returned to the tank through the first reversing valve 4 by the first pipeline B51; if the second right cylinder 21 retreats to the stop position and signals are sent, and the third left cylinder 3 and the third right cylinder 31 are both not operated to the position, at this time, the third left cylinder 3 and the third right cylinder 31 are both in action, the system pressure is relatively high, and the first oil cylinder needs a relatively low pressure, in order to solve the problem that the high and low pressures cannot work at the same time, the fourth reversing valve is started as a standby reversing valve, the fourth reversing valve 43 is moved to the right, the hydraulic oil at the inlet is introduced into the left cavity of the first oil cylinder 1 through the fourth reversing valve 43 by the fourth pipeline A58, so that the first oil cylinder 1 is advanced to the right, and the hydraulic oil in the right cavity of the first oil cylinder 1 is returned to the tank through the first reversing valve 4 by the fourth pipeline B59, so as to provide pressure for the first oil cylinder; if the first oil cylinder is operated to the right stop position, that is, the right stop position sends signals, at this time, the third left cylinder does not reach the advance stop position, the third right cylinder does not reach the retreat stop position, and the second right cylinder cannot be advanced to move, and starts to wait until the third right cylinder retreats to the stop position and signals are sent, and then the second right cylinder can be advanced to move, and the other side is the same.

[0107] The valve core of the second reversing valve 41 is moved to the left, the hydraulic oil at the inlet is introduced into the rodless cavity of the second right cylinder 21 through the second reversing valve 41 by the second pipeline B53, so that the second right cylinder 21 is advanced downward, and since the rod cavities of the second left cylinder 2 and the second right cylinder 21 are communicated, the second left cylinder 2 is simultaneously retreated upward, and the hydraulic oil in the rodless cavity of the second left cylinder 2 is returned to the tank through the second pipeline A52 by the second reversing valve 41;

[0108] The valve core of the third reversing valve 42 is moved to the left, the hydraulic oil at the inlet is introduced into the rodless cavity of the third right cylinder 31 through the third reversing valve 42 by the third pipeline B56, so that the third right cylinder 31 is advanced forward, and since the rod cavities of the third left cylinder 3 and the third right cylinder 31 are communicated, the third left cylinder 3 is simultaneously retreated backward, so that the hydraulic oil in the rodless cavity is returned to the tank through the third pipeline A55 by the third reversing valve 42.

[0109] The hydraulic control method of the embodiment, when the left side does not completely execute the program, that is, the third left cylinder does not reach the advance stop position, the third right cylinder does not reach the retreat stop position, at this time, the three cylinders are still in motion, the system pressure is relatively high, and the first oil cylinder needs a relatively low pressure, in order to solve the problem that the high and low pressures cannot work at the same time, the fourth reversing valve can be started as a standby reversing valve to provide pressure for the first oil cylinder.

[0110] Embodiment 8

[0111] The hydraulic control method of the embodiment is realized by using the hydraulic control system of the double-out bale wrapper in the above embodiment 6, and includes the following steps:

[0112] Initial state: First cylinder 1 is in the right position, second left cylinder 2 and third left cylinder 3 are in the retraction position, and second right cylinder 21 and third right cylinder 31 are in the forward position.

[0113] The first directional valve, the second directional valve 41, and the third directional valve 42 are in the neutral closed position.

[0114] When the first outlet of the double-outlet baler (located at) Figure 2 The left side reaches the bale discharge condition (i.e., the weighing sensor at the first bale discharge port and located at the bottom of the compression chamber reaches the weight setting condition, compressing the bale on the left side):

[0115] The valve core of the first directional valve 4 moves to the left, and the hydraulic oil at the inlet enters the right chamber of the first cylinder 1 through the first pipeline B51 via the first directional valve 4, causing the first cylinder 1 to move to the left. The hydraulic oil in the left chamber of the first cylinder 1 returns to the oil tank through the first pipeline A5 and the first directional valve 4. After the first cylinder 1 moves to the left and the left stop sensor sends a signal, the valve core of the first directional valve 4 returns to the neutral position and closes.

[0116] The valve core of the second directional valve 41 moves to the right, and the hydraulic oil at the inlet enters the rodless chamber of the second left cylinder 2 through the second pipeline B53 via the second directional valve 41, causing the second left cylinder 2 to move downward. Since the rod chambers of the second left cylinder 2 and the second right cylinder 21 are connected, the second right cylinder 21 moves upward simultaneously. The hydraulic oil in the rodless chamber of the second right cylinder 21 returns to the oil tank through the second pipeline B53 and the second directional valve 41. After the left cylinder 2 advance position sensor sends a signal, if the right cylinder 21 retraction position sensor also sends a signal, the valve core of the second directional valve 41 returns to the neutral position and the second directional valve 41 closes. If the right cylinder 21 retraction position sensor does not send a signal, the first solenoid ball valve 6 is opened to start replenishing oil to the second left cylinder 2 and the second right cylinder 21 until the retraction position sensor of the second right cylinder 21 also sends a signal. The second directional valve 41 closes, and the first solenoid ball valve 6 is connected in parallel with the first relief valve 64 for overpressure relief.

[0117] The third reversing valve 42 spool moves right, the hydraulic oil at the inlet port enters the rodless cavity of the third left cylinder 3 through the third reversing valve 42 from the third pipeline A 55, so that the third left cylinder 3 moves forward, and because the rod cavities of the third left cylinder 3 and the third right cylinder 31 are communicated, the third right cylinder 31 also moves backward at the same time, so that the hydraulic oil in the rodless cavity of the third right cylinder 31 returns to the tank through the third pipeline B 56 and the third reversing valve 42; after the third left cylinder 3 in-limit position sensor sends a signal, if the third right cylinder 31 retracts the limit position sensor also sends a signal, the third reversing valve 42 spool returns to the neutral position, and the third reversing valve 42 is closed; if the third right cylinder 31 retracts the limit position sensor has no signal, the second electromagnetic ball valve 61 is opened, the third left cylinder 3 and the third right cylinder 31 are started to be supplied with oil, until the third right cylinder 31 retracts the limit position sensor also sends a signal, the third reversing valve 42 is closed, the second electromagnetic ball valve 61 is connected with the second overflow valve 65 in parallel, and the pressure overflow is realized.

[0118] When the second bale outlet (located on the right side) of the double-bale baling machine reaches the bale outlet condition (that is, the weighing sensor at the second bale outlet and located at the bottom of the compression cavity reaches the weight setting condition, and the right side of the straw bale is compressed and baled): Figure 2

[0119] At this time, if the second right cylinder 21 retracts the limit position sensor sends a signal, the first reversing valve 4 spool moves right, the hydraulic oil at the inlet port enters the left cavity of the first oil cylinder 1 through the first reversing valve 4 and the first pipeline A 5, so that the first oil cylinder 1 moves right, and the hydraulic oil in the right cavity of the first oil cylinder 1 returns to the tank through the first pipeline B 51 and the first reversing valve 4; after the right limit position sensor on the right side of the first oil cylinder 1 sends a signal, the first reversing valve 4 spool returns to the neutral position, and the first reversing valve 4 is closed.

[0120] The second reversing valve 41 spool moves left, the hydraulic oil at the inlet port enters the rodless cavity of the second right cylinder 21 through the second reversing valve 41 and the second pipeline B 53, so that the second right cylinder 21 moves downward, and because the rod cavities of the second left cylinder 2 and the second right cylinder 21 are communicated, the second left cylinder 2 also moves upward at the same time, so that the hydraulic oil in the rodless cavity of the second left cylinder 2 returns to the tank through the second pipeline A 52 and the second reversing valve 41; after the second right cylinder 21 in-limit position sensor sends a signal, if the second left cylinder 2 retracts the limit position sensor also sends a signal, the second reversing valve 41 spool returns to the neutral position, and the second reversing valve 41 is closed; if the second left cylinder 2 retracts the limit position sensor has no signal, the first electromagnetic ball valve 6 is opened, the second left cylinder 2 and the second right cylinder 21 are started to be supplied with oil, until the second left cylinder 2 retracts the limit position sensor also sends a signal, the second reversing valve 41 is closed, the first electromagnetic ball valve 6 is connected with the first overflow valve 64 in parallel, and the pressure overflow is realized.

[0121] ​The third reversing valve 42 is moved to the left, and the hydraulic oil at the inlet is introduced into the rodless cavity of the third right cylinder 31 through the third reversing valve 42 from the third pipeline B56, so that the third right cylinder 31 is advanced, and the third left cylinder 3 is retracted at the same time, because the rod cavities of the third left cylinder 3 and the third right cylinder 31 are communicated, and the hydraulic oil in the rodless cavity of the third left cylinder 3 is returned to the tank through the third pipeline A55 and the third reversing valve 42; after the third right cylinder 31 reaches the limit position sensor and sends a signal, if the third left cylinder 3 also sends a signal, the third reversing valve 42 is returned to the middle position, and the third reversing valve 42 is closed; if the third left cylinder 3 does not send a signal, the second electromagnetic ball valve 61 is opened, and the third left cylinder 3 and the third right cylinder 31 are filled with oil, until the third left cylinder 3 also sends a signal, the third reversing valve 42 is closed, the second electromagnetic ball valve 61 is connected with the second overflow valve 65 in parallel, and the pressure is overflowed.

[0122] The hydraulic control method of the embodiment controls the smooth and stable progress of the hydraulic control process by sensing whether the action of the oil cylinder reaches the position through each sensor.

[0123] Embodiment 9

[0124] On the basis of any one of the above-mentioned embodiments 6 to 8, the initial state of the embodiment is replaced by the first oil cylinder being in the left position, the second right cylinder and the third right cylinder being in the retracted limit position, and the second left cylinder and the third left cylinder being in the advanced limit position; when the first bale outlet of the double-bale baling machine reaches the bale-out condition or the second bale outlet of the double-bale baling machine reaches the bale-out condition, the opposite control process is adopted.

[0125] Embodiment 10

[0126] The embodiment also provides a baling machine comprising a double-bale baling machine hydraulic control system as described in any one of the above-mentioned embodiments. The baling machine of the embodiment has faster baling action and simpler operation.

[0127] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0128] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0129] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0130] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0131] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0132] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A hydraulic control system for a double bale press, characterized in that, The hydraulic control system of the double-out bale bundling machine comprises an oil tank, an oil inlet, a first oil cylinder, a second left cylinder, a second right cylinder, a third left cylinder, a third right cylinder, a first reversing valve, a second reversing valve, a third reversing valve, a first electromagnetic ball valve, a second electromagnetic ball valve and a fourth reversing valve. The first oil cylinder is a bidirectional oil cylinder. The oil inlet is connected with the first reversing valve, the second reversing valve and the third reversing valve through an oil inlet pipeline. The first reversing valve is communicated with the left chamber and the right chamber of the first oil cylinder through a first pipeline A and a first pipeline B. The second reversing valve is communicated with the rodless chamber of the second left cylinder and the rodless chamber of the second right cylinder through a second pipeline A and a second pipeline B.

2. The hydraulic control system for a double bale press according to claim 1, wherein, The third reversing valve is communicated with the rodless chamber of the third left cylinder and the rodless chamber of the third right cylinder through a third pipeline A and a third pipeline B.

3. A hydraulic control method characterized by, The oil inlet is connected with the second pipeline C through a first oil supplement pipeline, and the first electromagnetic ball valve is arranged on the first oil supplement pipeline. The oil inlet is connected with the third pipeline C through a second oil supplement pipeline, and the second electromagnetic ball valve is arranged on the second oil supplement pipeline. The first oil supplement pipeline between the first electromagnetic ball valve and the second pipeline C is connected with a first overflow pipeline, and the first overflow valve is arranged on the first overflow pipeline. The second oil supplement pipeline between the second electromagnetic ball valve and the third pipeline C is connected with a second overflow pipeline, and the second overflow valve is arranged on the second overflow pipeline. The oil inlet is connected with the fourth reversing valve through a standby oil path, and the oil tank is connected with the fourth reversing valve through an oil return pipeline. The fourth reversing valve is communicated with the left chamber and the right chamber of the first oil cylinder through a fourth pipeline A and a fourth pipeline B. The oil inlet comprises a first oil inlet, a second oil inlet and a third oil inlet. The first oil inlet, the second oil inlet and the third oil inlet are connected with the first reversing valve, the second reversing valve and the third reversing valve respectively after converging through an oil inlet pipeline. The first oil cylinder is provided with a left limit sensor and a right limit sensor on both sides of the running direction. The second left cylinder is provided with an advance limit sensor and a retreat limit sensor on both sides of the running direction. The third left cylinder is provided with an advance limit sensor and a retreat limit sensor on both sides of the running direction. The third right cylinder is provided with an advance limit sensor and a retreat limit sensor on both sides of the running direction. The hydraulic control system of the double-out bale bundling machine is realized by the steps of: The initial state: the first oil cylinder is in the right position, the second left cylinder and the third left cylinder are in the retreat limit state, and the second right cylinder and the third right cylinder are in the advance limit state. The first reversing valve, the second reversing valve and the third reversing valve are in the middle closed state. When the first bale outlet of the double bale outlet baling machine reaches the baling condition: The first reversing valve spool moves left, and the hydraulic oil at the oil inlet enters the right cavity of the first oil cylinder through the first reversing valve from the first pipeline B, so that the first oil cylinder moves left, and the hydraulic oil in the left cavity of the first oil cylinder returns to the tank through the first reversing valve from the first pipeline A; The second reversing valve spool moves right, and the hydraulic oil at the oil inlet enters the rodless cavity of the second left cylinder through the second reversing valve from the second pipeline B, so that the second left cylinder moves down, and since the rod cavities of the second left cylinder and the second right cylinder are connected, the second right cylinder moves up at the same time, and the hydraulic oil in the rodless cavity of the second right cylinder returns to the tank through the second reversing valve from the second pipeline B; The third reversing valve spool moves right, and the hydraulic oil at the oil inlet enters the rodless cavity of the third left cylinder through the third reversing valve from the third pipeline A, so that the third left cylinder moves forward, and since the rod cavities of the third left cylinder and the third right cylinder are connected, the third right cylinder moves backward at the same time, so that the hydraulic oil in the rodless cavity of the third right cylinder returns to the tank through the third reversing valve from the third pipeline B; When the second bale outlet of the double bale outlet baling machine reaches the baling condition: At this time, if the second right cylinder retreats to the stop position and the third left cylinder and the third right cylinder are both in the running position, the first reversing valve spool moves right, and the hydraulic oil at the oil inlet enters the left cavity of the first oil cylinder through the first reversing valve from the first pipeline A, so that the first oil cylinder moves right, and the hydraulic oil in the right cavity of the first oil cylinder returns to the tank through the first reversing valve from the first pipeline B; if the second right cylinder retreats to the stop position and the third left cylinder and the third right cylinder are both not in the running position, at this time the third left cylinder and the third right cylinder are both in action, the fourth reversing valve spool moves right, and the hydraulic oil at the oil inlet enters the left cavity of the first oil cylinder through the fourth reversing valve from the fourth pipeline A, so that the first oil cylinder moves right, and the hydraulic oil in the right cavity of the first oil cylinder returns to the tank through the fourth pipeline B from the first reversing valve; The second reversing valve spool moves left, and the hydraulic oil at the oil inlet enters the rodless cavity of the second right cylinder through the second reversing valve from the second pipeline B, so that the second right cylinder moves down, and since the rod cavities of the second left cylinder and the second right cylinder are connected, the second left cylinder moves up at the same time, and the hydraulic oil in the rodless cavity of the second left cylinder returns to the tank through the second reversing valve from the second pipeline A; The third reversing valve spool moves left, and the hydraulic oil at the oil inlet enters the rodless cavity of the third right cylinder through the third reversing valve from the third pipeline B, so that the third right cylinder moves forward, and since the rod cavities of the third left cylinder and the third right cylinder are connected, the third left cylinder moves backward at the same time, so that the hydraulic oil in the rodless cavity of the third left cylinder returns to the tank through the third reversing valve from the third pipeline A.

4. A hydraulic control method characterized by, The double bale outlet baling machine hydraulic control system of claim 2 is realized by the following steps: Initial state: the first oil cylinder is in the right position, the second left cylinder and the third left cylinder are in the retreat stop position, and the second right cylinder and the third right cylinder are in the advance stop position; The first reversing valve, the second reversing valve and the third reversing valve are in the middle closed state; When the first bale outlet of the double bale outlet baling machine reaches the baling condition: The first reversing valve spool moves left, and the hydraulic oil at the inlet port enters the right cavity of the first oil cylinder through the first pipeline B via the first reversing valve, so that the first oil cylinder moves left, and the hydraulic oil in the left cavity of the first oil cylinder returns to the tank through the first pipeline A via the first reversing valve; after the first oil cylinder moves left to the left limit position sensor, the first reversing valve spool returns to the neutral position, and the first reversing valve is closed; The second reversing valve spool moves right, and the hydraulic oil at the inlet port enters the rodless cavity of the second left cylinder through the second pipeline B via the second reversing valve, so that the second left cylinder moves down, and the second right cylinder moves up at the same time due to the communication between the rod cavities of the second left cylinder and the second right cylinder, and the hydraulic oil in the rodless cavity of the second right cylinder returns to the tank through the second pipeline B via the second reversing valve; after the second left cylinder limit position sensor sends a signal, if the second right cylinder limit position sensor also sends a signal, the second reversing valve spool returns to the neutral position, and the second reversing valve is closed; if the second right cylinder limit position sensor does not send a signal, the first electromagnetic ball valve is opened, and the second left cylinder and the second right cylinder are started to be filled with oil until the second right cylinder limit position sensor also sends a signal, the second reversing valve is closed, the first electromagnetic ball valve is connected in parallel with the first overflow valve, and the pressure is overflowed; The third reversing valve spool moves right, and the hydraulic oil at the inlet port enters the rodless cavity of the third left cylinder through the third pipeline A via the third reversing valve, so that the third left cylinder moves forward, and the third right cylinder moves backward at the same time due to the communication between the rod cavities of the third left cylinder and the third right cylinder, and the hydraulic oil in the rodless cavity of the third right cylinder returns to the tank through the third pipeline B via the third reversing valve; after the third left cylinder limit position sensor sends a signal, if the third right cylinder limit position sensor also sends a signal, the third reversing valve spool returns to the neutral position, and the third reversing valve is closed; if the third right cylinder limit position sensor does not send a signal, the second electromagnetic ball valve is opened, and the third left cylinder and the third right cylinder are started to be filled with oil until the third right cylinder limit position sensor also sends a signal, the third reversing valve is closed, the second electromagnetic ball valve is connected in parallel with the second overflow valve, and the pressure is overflowed; When the second bale outlet of the double-bale wrapping machine reaches the bale outlet condition: At this time, if the second right cylinder limit position sensor sends a signal, the first reversing valve spool moves right, and the hydraulic oil at the inlet port enters the left cavity of the first oil cylinder through the first pipeline A via the first reversing valve, so that the first oil cylinder moves right, and the hydraulic oil in the right cavity of the first oil cylinder returns to the tank through the first pipeline B via the first reversing valve; after the right limit position sensor on the right side of the first oil cylinder sends a signal, the first reversing valve spool returns to the neutral position, and the first reversing valve is closed; The second reversing valve spool moves left, and the hydraulic oil at the inlet port enters the rodless chamber of the second right cylinder through the second pipeline B via the second reversing valve, so that the second right cylinder moves down to the next position. Since the rod chambers of the second left cylinder and the second right cylinder are connected, the second left cylinder moves up to the previous position at the same time, and the hydraulic oil in the rodless chamber of the second left cylinder returns to the tank through the second pipeline A via the second reversing valve; after the second right cylinder enters the limit position sensor and signals are sent, if the second left cylinder also sends signals to the limit position sensor, the second reversing valve spool returns to the neutral position, and the second reversing valve is closed; if the second left cylinder does not send signals, the first electromagnetic ball valve is opened, and the second left cylinder and the second right cylinder are supplemented with oil until the second left cylinder also sends signals to the limit position sensor, the second reversing valve is closed, the first electromagnetic ball valve is connected in parallel with the first overflow valve, and the pressure is overflowed; The third reversing valve spool moves left, and the hydraulic oil at the inlet port enters the rodless chamber of the third right cylinder through the third pipeline B via the third reversing valve, so that the third right cylinder moves forward to the next position. Since the rod chambers of the third left cylinder and the third right cylinder are connected, the third left cylinder moves backward to the previous position at the same time, so that the hydraulic oil in the rodless chamber returns to the tank through the third pipeline A via the third reversing valve; after the third right cylinder enters the limit position sensor and signals are sent, if the third left cylinder also sends signals to the limit position sensor, the third reversing valve spool returns to the neutral position, and the third reversing valve is closed; if the third left cylinder does not send signals, the second electromagnetic ball valve is opened, and the third left cylinder and the third right cylinder are supplemented with oil until the third left cylinder also sends signals to the limit position sensor, the third reversing valve is closed, the second electromagnetic ball valve is connected in parallel with the second overflow valve, and the pressure is overflowed.

5. The hydraulic control method according to claim 3 or 4, characterized by, The initial state is replaced by the first oil cylinder being in the left position, the second right cylinder and the third right cylinder being in the previous position, and the second left cylinder and the third left cylinder being in the next position; when the first bale outlet of the double-bale baler reaches the bale-out condition or the second bale outlet of the double-bale baler reaches the bale-out condition, the opposite control process is adopted.

6. A baler characterized in that, The hydraulic control system of a double-bale baler as claimed in claim 1 or 2. The hydraulic control system of a double-bale baler as claimed in claim 1 or 2.

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