Hydraulic control system of baling press and straw square bale baling press

Abstract

The present application relates to the field of hydraulic control, provide a kind of packing machine hydraulic control system and straw square bale packing machine, wherein, packing machine hydraulic control system, including main oil supply circuit including first oil tank, hydraulic pump and control valve group, first directional control valve is connected in pilot oil supply circuit with hydraulic pump, first directional control valve is connected with first oil tank and first oil cylinder, the telescopic rod of first oil cylinder is connected with the telescopic rod of second oil cylinder, second oil cylinder is connected with second oil tank and energy accumulator respectively, energy accumulator and second oil tank are connected with control valve group respectively.To solve the defect that packing machine hydraulic system maintenance cost is high in prior art, often stuck, the packing machine hydraulic control system provided by the present application, by main oil supply circuit and pilot oil supply circuit are all used hydraulic pump as power source, but first oil tank and second oil tank are used for oil supply respectively, regularly maintain second oil tank to ensure the cleanliness of pilot oil, effectively reduce the stuck phenomenon of control valve group, reduce maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and in particular to a hydraulic control system for a baler and a straw square bale baler. Background Technology

[0002] A baler, also known as a strapping machine, strapping machine, or bundling machine, uses strapping tape to bundle products or packages. The function of a baler is to compress straw, increasing the density of the crushed straw and reducing its volume during transportation. This prevents items from becoming too bulky and increasing handling difficulty and storage space requirements. After harvesting crops such as corn, the remaining straw can be used as feed for livestock such as cattle and horses. Therefore, mobile hydraulic straw balers are used to bale the straw for easier processing and transportation later.

[0003] In actual operation of balers, due to the large amount of dust from straw, the hydraulic system requires regular maintenance, such as regularly replacing filters, cleaning the hydraulic oil tank, and regularly filtering or changing the hydraulic oil. However, due to the concentrated work schedule and the high cost of regular maintenance, users often fail to properly maintain the hydraulic system, resulting in frequent jamming of the hydraulic system, especially the control valve assembly, which affects the work progress. Summary of the Invention

[0004] This invention provides a hydraulic control system for a baler and a straw square bale baler to solve the defects of high maintenance costs and frequent valve jamming in the hydraulic system of existing balers. It realizes the separation of the oil tanks of the pilot oil supply circuit and the main oil supply circuit, and performs separate periodic maintenance on the second oil tank, thereby reducing maintenance costs. Furthermore, the pilot oil supply circuit reduces the phenomenon of hydraulic system jamming.

[0005] This invention provides a hydraulic control system for a baling machine, comprising:

[0006] The main oil supply circuit includes a first oil tank, a hydraulic pump, and a control valve group. The oil inlet of the hydraulic pump is connected to the first oil tank, and the oil outlet of the hydraulic pump is connected to the control valve group.

[0007] The pilot oil supply circuit includes a second oil tank, a first directional valve, a first cylinder, a second cylinder, and an accumulator. The inlet of the first directional valve is connected to the hydraulic pump, the return port of the first directional valve is connected to the first oil tank, the outlet of the first directional valve is connected to the first cylinder, the extension rod of the first cylinder is connected to the extension rod of the second cylinder, the second cylinder is connected to both the second oil tank and the accumulator, and the second cylinder is used to charge the accumulator. The accumulator and the second oil tank are respectively connected to the pilot end of the control valve assembly.

[0008] According to the hydraulic control system of the baler provided by the present invention, the cylinder diameter ratio of the first cylinder to the second cylinder is greater than 1.

[0009] According to the hydraulic control system for a baler provided by the present invention, the pilot oil supply circuit further includes:

[0010] The first check valve has its inlet connected to the second oil tank and its outlet connected to the rodless chamber of the second cylinder.

[0011] The second check valve has its inlet connected to the rodless chamber of the second cylinder and its outlet connected to the accumulator.

[0012] According to the hydraulic control system of the baler provided by the present invention, the volume of the first oil tank is larger than the volume of the second oil tank, and the second oil tank is a closed oil tank.

[0013] According to the hydraulic control system of the baler provided by the present invention, the main oil supply circuit further includes an overflow valve, which is connected between the oil outlet of the hydraulic pump and the first oil tank.

[0014] According to the hydraulic control system of the baler provided by the present invention, the main oil supply circuit further includes: a cartridge valve, the oil inlet of which is connected to the oil outlet of the hydraulic pump, and the oil outlet of which is connected to the first oil tank; a second directional valve, the oil outlet of which is connected to the control port of the cartridge valve, the oil inlet of which is connected to the accumulator, and the oil return port of which is connected to the second oil tank.

[0015] According to the hydraulic control system of the baler provided by the present invention, the control valve group includes a first control valve, a second control valve and a third control valve. The first control valve is used to control the third cylinder in the X-axis direction, the second control valve is used to control the fourth cylinder in the Y-axis direction, and the third control valve is used to control the fifth cylinder in the Z-axis direction.

[0016] According to the hydraulic control system of the baler provided by the present invention, the first control valve, the second control valve and the third control valve have the same structure and are all externally controlled and externally leaking electro-hydraulic directional valves.

[0017] According to the hydraulic control system of the baling machine provided by the present invention, the first control valve includes:

[0018] A hydraulically controlled main valve, wherein the inlet of the hydraulically controlled main valve is connected to the hydraulic pump, the return port of the hydraulically controlled main valve is connected to the first oil tank, and the outlet of the hydraulically controlled main valve is connected to the third oil cylinder;

[0019] An electromagnetic pilot valve, wherein the inlet and outlet of the electromagnetic pilot valve are respectively connected to the pilot end, and the outlet of the electromagnetic pilot valve is respectively connected to the hydraulic control end of the hydraulic control main valve.

[0020] The present invention also provides a straw square baler, including the above-mentioned baler hydraulic control system.

[0021] The hydraulic control system for the baler provided by this invention uses hydraulic pumps as power sources for both the main oil supply circuit and the pilot oil supply circuit. However, oil is supplied by a first oil tank and a second oil tank, respectively. The second oil tank is regularly maintained to ensure the cleanliness of the pilot oil, effectively reducing the jamming of the control valve group and lowering maintenance costs. At the same time, the pilot oil supply circuit uses a first oil cylinder, a second oil cylinder, and a first reversing valve to intermittently charge the accumulator, thereby reducing the jamming of the pilot oil supply circuit, lowering power consumption, and reducing the overall machine cost.

[0022] Furthermore, the straw square baler provided by the present invention also possesses the various advantages described above due to the presence of the baler hydraulic control system described above. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the hydraulic control system for the baling machine provided by the present invention;

[0025] 100: Main oil supply circuit; 101: First oil tank; 102: Hydraulic pump; 103: Control valve assembly; 104: Third filter; 105: Relief valve; 106: Cartridge valve; 107: Second directional valve; 108: Fourth filter; 110: First control valve; 111: Second control valve; 112: Third control valve; 113: Hydraulic main valve; 114: Solenoid pilot valve; 120: Third cylinder; 121: Fourth cylinder; 122: Fifth cylinder;

[0026] 200: Pilot oil supply circuit; 201: Second oil tank; 202: First directional valve; 203: First oil cylinder; 204: Second oil cylinder; 205: First check valve; 206: Second check valve; 207: Accumulator; 208: First filter; 209: Second filter; 210: Pressure switch. Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The following is combined with Figure 1 The embodiments of the present invention will be described below. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute a limitation thereof.

[0032] like Figure 1As shown, the present invention provides a hydraulic control system for a baling machine, comprising: a main oil supply circuit 100 and a pilot oil supply circuit 200. The main oil supply circuit 100 includes a first oil tank 101, a hydraulic pump 102, and a control valve group 103. The oil inlet of the hydraulic pump 102 is connected to the first oil tank 101, and the oil outlet of the hydraulic pump 102 is connected to the control valve group 103. The pilot oil supply circuit 200 includes a second oil tank 201, a first directional valve 202, a first cylinder 203, a second cylinder 204, and an accumulator 207. The inlet of a first directional valve 202 is connected to a hydraulic pump 102, the return port of the first directional valve 202 is connected to a first oil tank 101, the outlet of the first directional valve 202 is connected to a first cylinder 203, the telescopic rod of the first cylinder 203 is connected to the telescopic rod of the second cylinder 204, the second cylinder 204 is connected to the second oil tank 201 and the accumulator 207 respectively, the second cylinder 204 is used to charge the accumulator 207, the accumulator 207 and the second oil tank 201 are respectively connected to the pilot end of the control valve group 103.

[0033] In other words, both the main oil supply circuit 100 and the pilot oil supply circuit 200 use hydraulic pump 102 as their power source. The pilot oil supply circuit 200 uses oil separately from the main oil supply circuit 100 through the first oil cylinder 203 and the second oil cylinder 204, using the first oil tank 101 and the second oil tank 201. Because the pilot oil supply circuit 200 is prone to jamming due to impurities in the oil, the second oil tank 201 is maintained separately on a regular basis. Since the pilot oil supply circuit 200 requires a smaller amount of oil, the oil volume in the second oil tank 201 is also smaller, resulting in lower regular maintenance costs. The main oil supply circuit 100 has a lower probability of jamming due to impurities in the oil, so it does not require frequent regular maintenance, thus saving costs.

[0034] In an optional embodiment of the present invention, the volume of the first oil tank 101 is larger than the volume of the second oil tank 201, and the second oil tank 201 is a closed oil tank. The closed-loop pressurized second oil tank 201 can reduce the degree of oil contamination and reduce the generation of impurities.

[0035] Specifically, the hydraulic pump 102 draws oil from the first oil tank 101 to supply the control valve assembly 103 and the first directional valve 202. After the first directional valve 202 reverses, it supplies oil to the first cylinder 203. The first cylinder 203 drives the second cylinder 204 to extend and retract. The second cylinder 204 draws oil from the second oil tank 201 to replenish the accumulator 207 for charging. The accumulator 207 serves as a pilot oil source to provide pilot oil for the reversing of the control valve assembly 103. Using the drive method of the first cylinder 203 and the second cylinder 204 as the pilot hydraulic power source results in a simple structure, low failure rate, low cost, and no need for a pilot overload protection device.

[0036] For example, the first directional valve 202 is an electromagnetic directional valve. When the Y9 electromagnetic terminal of the first directional valve 202 is energized, oil enters the rod chamber of the first cylinder 203, causing the first cylinder 203 to pull the second cylinder 204 out. The rodless chamber of the second cylinder 204 draws oil from the second oil tank 201. When the first directional valve 202 reverses, the Y9 electromagnetic terminal is de-energized, and the Y8 electromagnetic terminal is energized, allowing oil to enter the rodless chamber of the first directional valve 202. The first cylinder 203 pushes the second cylinder 204 back, and the oil in the rodless chamber of the second cylinder 204 enters the accumulator 207, charging the accumulator 207. The accumulator 207 then supplies oil to the pilot end of the control valve group 103, realizing the reversal of the control valve group 103. This, in turn, causes the actuator connected to the control valve group 103 to operate, achieving the packaging process. Multiple control valves in the control valve group 103 can operate simultaneously or sequentially.

[0037] Furthermore, in one embodiment of the invention, the cylinder diameter ratio of the first cylinder 203 to the second cylinder 204 is greater than 1. That is, the cylinder diameter of the first cylinder 203 is larger than that of the second cylinder 204. This allows for pressurization during the process of the first cylinder 203 driving the second cylinder 204 to draw oil. The pressure in the pilot oil supply circuit 200 is higher than the pressure in the main oil supply circuit 100, increasing the switching power of the hydraulic control main valve 113 and reducing the probability of jamming. The pressurized pilot oil effectively reduces jamming caused by oil impurities, improves the smoothness of the baler's hydraulic control system, avoids repeated cleaning and maintenance of the oil tank, and reduces maintenance costs.

[0038] Specifically, please refer to Figure 1 In another embodiment of the present invention, the pilot oil supply circuit 200 further includes: a first check valve 205 and a second check valve 206. The oil inlet of the first check valve 205 is connected to the second oil tank 201, the oil outlet of the first check valve 205 is connected to the rodless chamber of the second cylinder 204, the oil inlet of the second check valve 206 is connected to the rodless chamber of the second cylinder 204, and the oil outlet of the second check valve 206 is connected to the accumulator 207.

[0039] In other words, the inlet of the first check valve 205 is connected to the second oil tank 201, and the outlet of the first check valve 205 is connected to the rodless chamber of the second cylinder 204 and the inlet of the second check valve 206. The first check valve 205 ensures that the oil in the second oil tank 201 can only be drawn out and cannot flow back. The outlet of the second check valve 206 is connected to the accumulator 207 and the pilot end of the control valve assembly 103, respectively. The second check valve 206 ensures that the oil coming out of the rodless chamber of the second cylinder 204 can only enter the accumulator 207 and the pilot end of the control valve assembly 103, and the oil cannot be drawn back from the accumulator 207 into the second cylinder 204.

[0040] Specifically, for the pilot oil supply circuit 200 of the present invention, a first filter 208 is provided between the hydraulic pump 102 and the first directional valve 202 to improve the cleanliness of the pilot oil and reduce the failure rate of the pilot oil supply circuit 200; and because the first filter 208 has a small flow rate, the cost of replacing the filter element is low and replacement is convenient. A second filter 209 is provided between the second check valve 206 and the accumulator 207. In addition, a pressure switch 210 is provided at the oil port of the accumulator 207 to detect the pressure of the accumulator 207.

[0041] For example, when pressure switch 210 detects that the pressure of accumulator 207 is less than a first preset value, pressure switch 210 can control the first reversing valve 202 to switch direction via the controller, thereby charging accumulator 207. When pressure switch 210 detects that the pressure of accumulator 207 is greater than or equal to a second preset value, pressure switch 210 controls the second reversing valve 107 to stop working via the controller. Therefore, the charging process of the first cylinder 203 and the second cylinder 204 can operate intermittently, using accumulator 207 as a pilot oil source to stabilize the pilot oil pressure. At the same time, intermittent operation reduces the number of times the first reversing valve 202 operates, reducing the jamming failure rate of the first reversing valve 202. The first reversing valve 202 can be a manual-electric integrated structure; when electrical jamming occurs, the first reversing valve 202 can be manually controlled to switch direction, enabling temporary operation and improving work efficiency.

[0042] Of course, since the pushing of the first cylinder 203 and the second cylinder 204 has a time delay, in order to improve the control accuracy, a time delay relay can also be set. The time delay relay is connected to the controller and together with the pressure switch 210 controls the gain and loss of power of the first reversing valve 202.

[0043] In another specific embodiment of the present invention, the main oil supply circuit 100 further includes a relief valve 105, which is connected between the oil outlet of the hydraulic pump 102 and the first oil tank 101. The relief valve 105 functions as a safety valve; when the hydraulic control system of the baler is operating normally, the relief valve 105 does not open, thus preventing jamming. Overload relief protection is provided when the pressure in the hydraulic control system of the baler is too high.

[0044] Continue to refer to Figure 1 In some embodiments of the present invention, the main oil supply circuit 100 further includes: a cartridge valve 106 and a second directional valve 107, wherein the oil inlet of the cartridge valve 106 is connected to the oil outlet of the hydraulic pump 102, and the oil outlet of the cartridge valve 106 is connected to the first oil tank 101; the oil outlet of the second directional valve 107 is connected to the control port of the cartridge valve 106, the oil inlet of the second directional valve 107 is connected to the accumulator 207, and the oil return port of the second directional valve 107 is connected to the second oil tank 201.

[0045] In other words, the reversing function of the second directional valve 107 controls the opening and closing of the cartridge valve 106, thus controlling whether the hydraulic pump 102 is unloaded. In the standby state of the baler, the second directional valve 107 controls the connection between the inlet and outlet of the cartridge valve 106, meaning the cartridge valve 106 is open and the hydraulic pump 102 is unloaded. In the normal operating state of the hydraulic pump 102, the second directional valve 107 reverses, and the pilot oil from the accumulator 207 closes the cartridge valve 106. The second directional valve 107 can be a solenoid directional valve, and the cartridge valve 106 is connected in parallel with the relief valve 105. A high-flow cartridge valve 106 is chosen, resulting in a low pressure differential, which reduces heat generation in the baler's hydraulic control system. In other words, the high-flow cartridge valve 106 reduces hydraulic resistance, thereby lowering the hydraulic system oil temperature. Simultaneously, the second directional valve 107 uses oil from the pilot oil supply circuit 200 as control oil, separating it from the main oil supply circuit 100, thus reducing the likelihood of jamming. By separating unloading and overflow, the failure rate of overflow valve 105 is reduced.

[0046] Furthermore, in some optional embodiments of the present invention, the control valve assembly 103 of the present invention includes a first control valve 110, a second control valve 111 and a third control valve 112. The first control valve 110 is used to control the third cylinder 120 in the X-axis direction, the second control valve 111 is used to control the fourth cylinder 121 in the Y-axis direction, and the third control valve 112 is used to control the fifth cylinder 122 in the Z-axis direction.

[0047] In other words, the first control valve 110, the second control valve 111, and the third control valve 112 respectively control the extension and retraction of the third cylinder 120, the fourth cylinder 121, and the fifth cylinder 122, and can be controlled simultaneously or individually. The pilot ends of the first control valve 110, the second control valve 111, and the third control valve 112 are all connected to the accumulator 207.

[0048] In an optional embodiment of the present invention, the first control valve 110, the second control valve 111, and the third control valve 112 have the same structure and are all externally controlled and externally leaking electro-hydraulic directional valves.

[0049] Specifically, in the embodiments of the present invention, the first control valve 110 for the externally controlled, externally leaking electro-hydraulic directional valve includes: a hydraulically controlled main valve 113 and a solenoid pilot valve 114. The inlet of the hydraulically controlled main valve 113 is connected to the hydraulic pump 102, the return port of the hydraulically controlled main valve 113 is connected to the first oil tank 101, and the outlet of the hydraulically controlled main valve 113 is connected to the third oil cylinder 120. The inlet and return ports of the solenoid pilot valve 114 are respectively connected to the pilot end, and the outlet of the solenoid pilot valve 114 is respectively connected to the hydraulically controlled end of the hydraulically controlled main valve 113. Similarly, the second control valve 111 and the third control valve 112 both include the hydraulically controlled main valve 113 and the solenoid pilot valve 114.

[0050] During operation, solenoid valves such as solenoid pilot valve 114, solenoid-controlled first directional valve 202, and solenoid-controlled second directional valve 107 are prone to jamming. By supplying oil to solenoid valves such as solenoid pilot valve 114, first directional valve 202, and second directional valve 107 separately through a smaller second oil tank 201, the cost of regular maintenance can be reduced.

[0051] In detail, the hydraulic control main valve 113 includes a first hydraulic control terminal and a second hydraulic control terminal. For example, when the first hydraulic control terminal enters the pilot oil, the hydraulic control main valve 113 operates in the left position, and the third cylinder 120 extends. When the second hydraulic control terminal enters the pilot oil, the hydraulic control main valve 113 operates in the right position, and the third cylinder 120 retracts. The neutral position function of the hydraulic control main valve 113 can be O-type. The electromagnetic pilot valve 114 is used to control the pilot oil supply to the first and second hydraulic control terminals. The electromagnetic pilot valve 114 includes a first electromagnetic terminal and a second electromagnetic terminal. When the first electromagnetic terminal Y2 is energized, the pilot oil in the accumulator 207 enters the second hydraulic control terminal of the hydraulic control main valve 113. When the second electromagnetic terminal Y3 is energized, the pilot oil in the accumulator 207 enters the first hydraulic control terminal of the hydraulic control main valve 113. The neutral position function of the electromagnetic pilot valve 114 can be Y-type. The oil inlet of the electromagnetic pilot valve 114 is connected to the accumulator 207 and the second check valve 206. The oil return port of the electromagnetic pilot valve 114 is connected to the second oil tank 201. One oil outlet of the electromagnetic pilot valve 114 is connected to the first hydraulic control terminal of the hydraulic control main valve 113, and the other oil outlet of the electromagnetic pilot valve 114 is connected to the second hydraulic control terminal of the hydraulic control main valve 113.

[0052] Regarding the main oil supply circuit 100 of the present invention, the main oil supply circuit 100 further includes a third filter 104 and a fourth filter 108. The third filter 104 is disposed at the inlet of the first oil tank 101, that is, the third filter 104 is disposed between the first oil tank 101 and the overflow valve 105 and the cartridge valve 106. The fourth filter 108 is disposed at the outlet of the first oil tank 101, that is, the fourth filter 108 is disposed between the first oil tank 101 and the hydraulic pump 102.

[0053] The present invention also provides a straw square baler, including the baler hydraulic control system described in the above embodiment.

[0054] The hydraulic control system for the baler provided by this invention uses a hydraulic pump 102 as the power source for both the main oil supply circuit 100 and the pilot oil supply circuit 200. However, it uses a first oil tank 101 and a second oil tank 201 for oil supply respectively. Regular maintenance of the second oil tank 201 ensures the cleanliness of the pilot oil, effectively reducing the jamming phenomenon of the control valve group 103 and reducing maintenance costs. At the same time, the pilot oil supply circuit 200 uses a first oil cylinder 203, a second oil cylinder 204 and a first reversing valve 202 to intermittently charge the accumulator 207, thereby reducing the jamming of the pilot oil supply circuit 200, reducing power consumption and overall machine cost.

[0055] Furthermore, the straw square baler provided by the present invention also possesses the various advantages described above due to the presence of the baler hydraulic control system described above.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic control system for a baling machine, characterized in that, include: The main oil supply circuit includes a first oil tank, a hydraulic pump, and a control valve assembly. The inlet of the hydraulic pump is connected to the first oil tank, and the outlet of the hydraulic pump is connected to the control valve assembly. The pilot oil supply circuit includes a second oil tank, a first directional valve, a first cylinder, a second cylinder, and an accumulator. The inlet of the first directional valve is connected to the hydraulic pump, the return port of the first directional valve is connected to the first oil tank, the outlet of the first directional valve is connected to the first cylinder, the extension rod of the first cylinder is connected to the extension rod of the second cylinder, the second cylinder is connected to both the second oil tank and the accumulator, and the second cylinder is used to charge the accumulator. The accumulator and the second oil tank are respectively connected to the pilot end of the control valve assembly.

2. The hydraulic control system for the baling machine according to claim 1, characterized in that, The ratio of the cylinder diameter of the first cylinder to that of the second cylinder is greater than 1.

3. The hydraulic control system for the baling machine according to claim 1, characterized in that, The pilot oil supply circuit further includes: a first check valve, the inlet of which is connected to the second oil tank, and the outlet of which is connected to the rodless chamber of the second cylinder; and a second check valve, the inlet of which is connected to the rodless chamber of the second cylinder, and the outlet of which is connected to the accumulator.

4. The hydraulic control system for the baling machine according to claim 1, characterized in that, The volume of the first fuel tank is larger than that of the second fuel tank, which is a closed fuel tank.

5. The hydraulic control system for the baling machine according to claim 1, characterized in that, The main oil supply circuit also includes an overflow valve, which is connected between the oil outlet of the hydraulic pump and the first oil tank.

6. The hydraulic control system for the baling machine according to any one of claims 1 to 5, characterized in that, The main oil supply circuit further includes: a cartridge valve, the inlet of which is connected to the outlet of the hydraulic pump, and the outlet of which is connected to the first oil tank; and a second directional valve, the outlet of which is connected to the control port of the cartridge valve, the inlet of which is connected to the accumulator, and the return port of which is connected to the second oil tank.

7. The hydraulic control system for the baling machine according to any one of claims 1 to 5, characterized in that, The control valve group includes a first control valve, a second control valve, and a third control valve. The first control valve is used to control the third cylinder in the X-axis direction, the second control valve is used to control the fourth cylinder in the Y-axis direction, and the third control valve is used to control the fifth cylinder in the Z-axis direction.

8. The hydraulic control system for the baling machine according to claim 7, characterized in that, The first control valve, the second control valve, and the third control valve have the same structure; they are all externally controlled and externally leaking electro-hydraulic directional valves.

9. The hydraulic control system for the baling machine according to claim 8, characterized in that, The first control valve includes: a hydraulically controlled main valve, the inlet of which is connected to the hydraulic pump, the return port of which is connected to the first oil tank, and the outlet of which is connected to the third oil cylinder; and an electromagnetic pilot valve, the inlet and return ports of which are respectively connected to the pilot end, and the outlet of which is respectively connected to the hydraulically controlled end of the hydraulically controlled main valve.

10. A straw square baler, characterized in that, The packaging machine hydraulic control system includes any one of claims 1 to 9.

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