Hydraulic system of double-bale joint-beating straw baler and forming method of hydraulic system

Abstract

The invention discloses a hydraulic system of a double-packing linked-beating straw packing machine and a forming method of the hydraulic system. The method comprises the steps that vertical pressing heads used for controlling a left packing device and a right packing device respectively and corresponding oil cylinders used for controlling telescopic movement of the front pressing head and the rear pressing head are connected together in series; the extension or retraction action of any one of the corresponding oil cylinders can control the other oil cylinder at the same time; an electromagnetic valve and a hydraulic control one-way valve are integrated in an oil way of a communicating cavity of every two oil cylinders connected in series, so that oil in the communicating cavity is supplemented or released in time, and it is guaranteed that the oil cylinders act synchronously; an electro-hydraulic valve is arranged in an oil way of a horizontal compression oil cylinder used for controlling horizontal pressing heads of a left packing device and a right packing device to stretch out and draw back respectively, so that the horizontal compression oil cylinder can act independently relative to two pairs of oil cylinders which are connected in series. According to the hydraulic system formed by the method, the efficiency and the response speed of the hydraulic system are improved, the packing time of the double-packing linkage straw packing machine is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of straw agricultural machinery, and in particular to a hydraulic system of a double-bale straw baler and a forming method thereof. Background Art

[0002] A straw baler is a kind of baling and compression equipment, which compresses light-weight straw with large stacking space together for easy transportation. Prior art straw balers usually use a single baling device, that is, a baling device is set on the left or right side of the frame, and the baling device has a horizontal pressure head that can be telescopically moved left and right, a vertical pressure head that can be telescopically moved vertically, and a front and rear pressure head that can be telescopically moved forward and backward. These pressure heads perform corresponding telescopic movements under the drive of the hydraulic system to compress and pack the straw in the bin. However, the single baling device can only pack straw on one side, making the straw baler inefficient.

[0003] In order to solve the problem of low efficiency of straw balers with a single baling device, the prior art also has a straw baler with a double baling device, that is, a baling device is set on the left and right sides of the frame, each baling device has a horizontal pressure head that can be telescopically moved left and right, a vertical pressure head that can be telescopically moved vertically, and a front and rear pressure head that can be telescopically moved forward and backward. These pressure heads perform corresponding telescopic movements under the drive of the hydraulic system to compress and pack the straw in the bin. However, the hydraulic system used in the above baler usually relies on a complex oil circuit design and multiple control elements to control the cylinder, which not only increases the complexity and cost of the system, but also limits the working efficiency and response speed of the system. For example, five pressure heads are connected to five oil cylinders respectively. When the oil cylinder connected to each pressure head is telescopic, the oil cylinders connected to the other pressure heads cannot be telescopic at the same time, so the baling device takes a long time to complete the baling; for another example, when the oil cylinder returns to its position, the pressure oil flows back to the oil tank, and when it is telescopic, it is supplied to the oil cylinder from the oil tank, so that the pressure oil flows for a long time during the extension and return of the oil cylinder, which not only increases the action time, but also increases the instability of the oil cylinder operation, and so on.

[0004] Therefore, those skilled in the art are in urgent need of a hydraulic system that can improve the baling efficiency of a baling and beating straw baler. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a hydraulic system for a double-bale straw baler and a method for forming the same. The hydraulic system formed by the method improves the efficiency and response speed of the hydraulic system, reduces the baling time of the double-bale straw baler, and improves work efficiency.

[0006] To achieve the above-mentioned object of the present invention, the present invention provides a method for forming a hydraulic system of a double-bale straw baler, wherein the double-bale straw baler comprises a left baling device and a right baling device, and both the left baling device and the right baling device have a horizontal pressure head, a vertical pressure head, and a front and rear pressure head, and the method comprises:

[0007] By connecting in series the corresponding oil cylinders for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices, the extension or retraction movement of any one of the corresponding oil cylinders can simultaneously control the other oil cylinder;

[0008] By integrating a solenoid valve and a hydraulically controlled one-way valve in the oil circuit of the connecting chamber of each two oil cylinders connected in series, the oil in the connecting chamber can be replenished or released in time to ensure the synchronization of the oil cylinders;

[0009] By arranging an electro-hydraulic valve in the oil circuit of the horizontal compression cylinder used to control the telescopic movement of the horizontal pressure head of the left packing device and the right packing device respectively, the horizontal compression cylinder can act independently relative to the two pairs of cylinders connected in series to improve work efficiency.

[0010] Preferably, the corresponding oil cylinders for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices are connected in series, including:

[0011] A left front and rear compression oil cylinder with a rod chamber for driving the front and rear pressure heads in the left packing device to move telescopically and a right front and rear compression oil cylinder with a rod chamber for driving the front and rear pressure heads in the right packing device to move telescopically are connected in series;

[0012] A left vertical compression oil cylinder with a rod chamber for driving the telescopic movement of a vertical pressure head in a left packing device and a right vertical compression oil cylinder with a rod chamber for driving the telescopic movement of a vertical pressure head in a right packing device are connected in series.

[0013] Preferably, a solenoid valve and a hydraulically controlled one-way valve are respectively integrated in the oil circuit of the communicating chambers of every two oil cylinders connected in series, including:

[0014] A first electromagnetic reversing valve and a first hydraulically controlled one-way valve are provided between the front and rear cylinder communication chamber oil passages and the oil supply passages of the left front and rear compression cylinders and the right front and rear compression cylinders connected in series;

[0015] A second electromagnetic reversing valve and a second hydraulically controlled one-way valve are arranged between the vertical cylinder communication chamber oil path and the oil supply channel of the left vertical compression cylinder and the right vertical compression cylinder connected in series.

[0016] Preferably, an electro-hydraulic valve is provided in the oil circuit of the horizontal compression oil cylinder for respectively controlling the telescopic movement of the horizontal pressure head of the left packing device and the right packing device, comprising:

[0017] A left piston rod for driving the horizontal pressure head in the left packing device to telescope left and right and a right piston rod for driving the horizontal pressure head in the right packing device to telescope left and right are placed in the horizontal compression cylinder in opposite directions;

[0018] A fourth electro-hydraulic reversing valve is arranged between the left rod chamber, the right rod chamber and the oil supply channel of the horizontal compression oil cylinder.

[0019] Preferably, the oil supply channel is connected with the horizontal compression cylinder, the left front and rear compression cylinder, the right front and rear compression cylinder, the left vertical compression cylinder, and the right vertical compression cylinder, including:

[0020] A first oil circuit is formed by a first hydraulic pump and a first one-way valve and a first electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the first hydraulic pump;

[0021] A second oil circuit is formed by a second hydraulic pump and a second one-way valve and a second electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the second hydraulic pump;

[0022] A third oil circuit is formed by a third hydraulic pump and a third one-way valve and a third electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the third hydraulic pump;

[0023] Connect the oil outlet pipelines of the three oil circuits together through a main pipeline;

[0024] The oil in the main pipeline is supplied to the horizontal compression cylinder through the first branch pipeline;

[0025] The oil in the main pipeline is supplied to the left front and rear compression cylinder and the right front and rear compression cylinder through the second branch pipeline;

[0026] The oil in the main pipeline is supplied to the left vertical compression cylinder and the right vertical compression cylinder through the third branch pipeline.

[0027] Preferably, when the oil of the main pipeline is supplied to the corresponding oil cylinder through each branch pipeline, an electro-hydraulic reversing valve is respectively arranged on each branch pipeline.

[0028] Preferably, the horizontal compression oil cylinder, the left front and rear compression oil cylinder, the right front and rear compression oil cylinder, the left vertical compression oil cylinder, and the right vertical compression oil cylinder are connected to the oil supply channel for supplying oil to each cylinder, and further comprises:

[0029] The pressure oil provided by one of the three hydraulic pumps is supplied to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder through the fourth oil circuit.

[0030] Preferably, when the pressure oil provided by one of the three hydraulic pumps is supplied to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder through the fourth oil circuit, the fourth electro-hydraulic reversing valve is arranged on the fourth oil circuit.

[0031] Preferably, the vertical oil cylinder connecting chamber oil circuit and the front and rear oil cylinder connecting chamber oil circuit are respectively connected to the fourth oil circuit.

[0032] Preferably, when the pressure oil provided by one of the three hydraulic pumps is supplied to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder through the fourth oil circuit, a pressure detection element for detecting the channel pressure is arranged in the fourth oil circuit.

[0033] Preferably, when the oil outlet pipelines of the three oil circuits are connected together through a main pipeline, a pressure detection element for detecting the pressure of the main pipeline is arranged on the main pipeline.

[0034] In addition, the present invention also provides a hydraulic system of a double-bale straw baler formed by the method as described above, including: a pipeline connecting in series the corresponding cylinders used to respectively control the telescopic movement of the vertical pressure heads and the front and rear pressure heads of the left baling device and the right baling device, so that the extension or retraction action of any of the corresponding cylinders can simultaneously control the other cylinder; an electromagnetic valve and a hydraulically controlled one-way valve are respectively integrated in the oil circuit of the connecting cavity of each two cylinders connected in series, so that the oil in the connecting cavity can be replenished or released in time to ensure the synchronization of the cylinder movements; an electro-hydraulic valve is arranged in the oil circuit of the horizontal compression cylinder used to respectively control the telescopic movement of the horizontal pressure heads of the left baling device and the right baling device, so that the horizontal compression cylinder can act independently relative to the two pairs of cylinders connected in series to improve work efficiency.

[0035] Preferably, the pipelines connecting in series the corresponding cylinders for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices include: the front and rear cylinder connecting chamber oil circuit connecting in series the rod chamber of the left front and rear compression cylinder for driving the telescopic movement of the front and rear pressure head in the left packing device and the rod chamber of the right front and rear compression cylinder for driving the telescopic movement of the front and rear pressure head in the right packing device; the vertical cylinder connecting chamber oil circuit connecting in series the rod chamber of the left vertical compression cylinder for driving the telescopic movement of the vertical pressure head in the left packing device and the rod chamber of the right vertical compression cylinder for driving the telescopic movement of the vertical pressure head in the right packing device.

[0036] Preferably, a first electromagnetic reversing valve and a first hydraulically controlled one-way valve are arranged between the oil circuit of the front and rear oil cylinder connecting chambers and the oil supply channel; a second electromagnetic reversing valve and a second hydraulically controlled one-way valve are arranged between the oil circuit of the vertical oil cylinder connecting chamber and the oil supply channel.

[0037] Preferably, the left piston rod for driving the horizontal pressure head in the left packing device to telescope left and right and the right piston rod for driving the horizontal pressure head in the right packing device to telescope left and right are arranged back to back in the horizontal compression cylinder, and a fourth electro-hydraulic reversing valve is arranged between the left rod chamber, the right rod chamber and the oil supply channel of the horizontal compression cylinder.

[0038] Preferably, the oil supply channel is connected to the horizontal compression cylinder, the left front and rear compression cylinder, the right front and rear compression cylinder, the left vertical compression cylinder, and the right vertical compression cylinder, and the oil supply channel includes: a first oil circuit, including: a first hydraulic pump; a first one-way valve and a first electromagnetic overflow valve arranged in parallel on the oil outlet pipeline of the first hydraulic pump; a second oil circuit, including: a second hydraulic pump; a second one-way valve and a second electromagnetic overflow valve arranged in parallel on the oil outlet pipeline of the second hydraulic pump; a third oil circuit, including: a third hydraulic pump; a third one-way valve and a third electromagnetic overflow valve arranged in parallel on the oil outlet pipeline of the third hydraulic pump; a main pipeline connecting the oil outlet pipelines of the three oil circuits together; a first branch pipeline in parallel that supplies oil from the main pipeline to the horizontal compression cylinder, a second branch pipeline that supplies oil from the main pipeline to the left front and rear compression cylinder and the right front and rear compression cylinder, and a third branch pipeline that supplies oil from the main pipeline to the left vertical compression cylinder and the right vertical compression cylinder.

[0039] Preferably, an electro-hydraulic reversing valve is respectively provided on the three branch pipelines.

[0040] Preferably, the oil supply passage also includes a fourth oil circuit, which is used to supply the pressurized oil provided by one of the three hydraulic pumps to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder.

[0041] Preferably, the electro-hydraulic reversing valve arranged between the left rod chamber, the right rod chamber and the oil supply channel of the horizontal compression oil cylinder is arranged on the fourth oil circuit.

[0042] Preferably, the vertical oil cylinder connecting chamber oil circuit and the front and rear oil cylinder connecting chamber oil circuit are respectively connected to the fourth oil circuit.

[0043] Preferably, a pressure detection element for detecting the pressure of the main pipeline is provided on the main pipeline.

[0044] Preferably, a pressure detection element for detecting the pressure of the channel is provided on the fourth oil circuit.

[0045] Compared with the prior art, the hydraulic system of the double-bale straw baler and the forming method thereof of the present invention have the following beneficial effects:

[0046] 1. The hydraulic system of the double-bale straw baler formed by the method of the present invention improves the efficiency and response speed of the hydraulic system, reduces the baling time of the double-bale straw baler, and improves work efficiency.

[0047] 2. The hydraulic system of the double-bale straw baler formed by the method of the present invention respectively controls the vertical pressure heads of the left baling device and the right baling device, and the corresponding cylinders for the telescopic movement of the front and rear pressure heads are connected in series, so that when any cylinder in a pair of vertical compression cylinders or a pair of front and rear compression cylinders extends or retracts, the other cylinder in the corresponding group synchronously performs the opposite action, thereby realizing the synchronization of the action of the series cylinders, saving the flow time difference of the series cylinder oil circuit, and significantly improving the cylinder action and the working efficiency of the baler.

[0048] 3. The hydraulic system of the double-bale straw baler formed by the method of the present invention integrates a solenoid valve and a hydraulically controlled one-way valve in the connecting cavity of the two oil cylinders in series, so that the oil in the connecting cavity can be replenished or released in time, ensuring that the two oil cylinders in series can act synchronously. For example, when the amount of oil is too much, the excess oil is drained through the coordinated work of the solenoid valve and the hydraulically controlled one-way valve; when the amount of oil is insufficient, the oil is supplemented through the control of the two valves, so that the two oil cylinders in series can act synchronously in place, thereby ensuring the stable operation of the corresponding oil cylinders.

[0049] 4. The hydraulic system of the double-bale straw baler formed by the method of the present invention can introduce the oil in the oil leakage circuit of the low-pressure pump into the oil chamber of the horizontal compression cylinder by arranging an electro-hydraulic valve in the oil circuit of the horizontal compression cylinder for respectively controlling the telescopic movement of the horizontal pressure head of the left baling device and the right baling device, so that the horizontal compression cylinder can respond quickly when it is actuated simultaneously with the vertical compression cylinder or the front and rear compression cylinders, and the horizontal compression cylinder can act independently relative to the two pairs of cylinders connected in series, thereby improving the response speed of the cylinder and improving the working efficiency of the hydraulic system and the baler.

[0050] The present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a flow chart of a method for forming a hydraulic system of a double-bale straw baler of the present invention;

[0052] Figure 2 It is a schematic diagram of the hydraulic system of the double-bale straw baler of the present invention;

[0053] Figure 3 It is a first angle principle diagram of each oil cylinder in the hydraulic system of the present invention acting on the horizontal pressure head, vertical pressure head, and front and rear pressure heads in the left packing device and the right packing device;

[0054] Figure 4 for Figure 3 The schematic diagram of the hydraulic system shown when each cylinder acts on the horizontal pressure head, vertical pressure head, and front and rear pressure heads in the left and right packing devices;

[0055] Figure 5It is a schematic diagram of the serial oil circuit of the hydraulic system of the double-bale straw baler of the present invention;

[0056] Figure 6 It is a schematic diagram of the oil filling or oil unloading principle of the communication chamber of the hydraulic system of the double-bale straw baler of the present invention;

[0057] Figure 7 The present invention is a schematic diagram of the fast response cylinder control of the hydraulic system of the double-bale straw baler. DETAILED DESCRIPTION

[0058] like Figure 1 As shown, it is a flow chart of a method for forming a hydraulic system of a double-bale straw baler provided by the present invention. The double-bale straw baler comprises a left baling device and a right baling device. Both the left baling device and the right baling device have a horizontal pressure head, a vertical pressure head, and front and rear pressure heads. The method of the present invention comprises:

[0059] By connecting in series the corresponding oil cylinders for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices, the extension or retraction movement of any one of the corresponding oil cylinders can simultaneously control the other oil cylinder;

[0060] By integrating a solenoid valve and a hydraulically controlled one-way valve in the oil passage of the connecting chamber of each two oil cylinders connected in series, the oil in the connecting chamber can be replenished or released in time, ensuring that the two oil cylinders connected in series can act synchronously;

[0061] By arranging an electro-hydraulic valve in the oil circuit of the horizontal compression cylinder used to control the telescopic movement of the horizontal pressure head of the left packing device and the right packing device respectively, the horizontal compression cylinder can act independently relative to the two pairs of cylinders connected in series to improve work efficiency.

[0062] The connecting cavity refers to the volume cavity of two oil cylinders connected in series.

[0063] Specifically, the double-bale straw baler of the present invention comprises a left baling device and a right baling device, both of which have a horizontal pressure head, a vertical pressure head, a front and rear pressure head and a baling bin, and the left baling device and the right baling device are respectively located on the left and right sides of the double-bale straw baler, the left baling device has a baling bin 100 for placing the straw to be baled inside, and the right baling device has a right baling bin 200 for placing the straw to be baled inside, in addition, the left baling device has a horizontal pressure head 101, a vertical pressure head 102, and a front and rear pressure head 103 located on the left side of the baler, and the right baling device has a horizontal pressure head 201, a vertical pressure head 202, and a front and rear pressure head 203 located on the right side of the baler. Among them, the horizontal pressure heads of the left and right baling devices squeeze the straw in the horizontal direction (i.e., in the direction perpendicular to the travel direction of the baler), the vertical pressure heads squeeze the straw in the vertical direction, and the front and rear pressure heads squeeze the straw in the front and rear direction (i.e., in the travel direction of the baler), and push the straw bales formed after squeezing into place to the outside of the corresponding baling bin. The structure of the straw baler with a left baling device and a right baling device can refer to the existing technical structure and will not be described in detail here.

[0064] In order to enable the hydraulic system that drives the respective pressure heads in the left baling device and the right baling device of the double-bale straw baler to perform corresponding actions to achieve high efficiency and rapid response of the oil cylinder through simplified oil circuit design and optimized control strategy, the present invention forms a hydraulic system for the double-bale straw baler through the following method:

[0065] S01, by connecting in series the corresponding oil cylinders for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices, so that the extension or retraction action of any one of the corresponding oil cylinders can simultaneously control the other oil cylinder;

[0066] S11, connect each pressure head with each oil cylinder

[0067] Before the corresponding oil cylinders for controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices are connected in series, the pressure heads are first connected to the oil cylinders to drive the telescopic movement of the pressure heads through the oil cylinders. Among them, the horizontal compression oil cylinder of the present invention adopts a double-rod oil cylinder, that is, the horizontal compression oil cylinder has a left piston rod extending horizontally to the left and a right piston rod extending horizontally to the right, which are arranged opposite to each other, while the left vertical compression oil cylinder, the right vertical compression oil cylinder, the left front and rear compression oil cylinder, and the right front and rear compression oil cylinder are all single-rod oil cylinders.

[0068] When connecting, the horizontal pressure head on the left is connected to the left piston rod of the horizontal compression cylinder, the vertical pressure head on the left is connected to the piston rod of the left vertical compression cylinder, and the front and rear pressure heads on the left are connected to the piston rod of the left front and rear compression cylinder; the horizontal pressure head on the right is connected to the right piston rod of the horizontal compression cylinder, the vertical pressure head on the right is connected to the piston rod of the right vertical compression cylinder, and the front and rear pressure heads on the right are connected to the piston rod of the right front and rear compression cylinder. The horizontal pressure head on the left is driven to telescope by the left piston rod of the horizontal compression cylinder, the horizontal pressure head on the right is driven to telescope by the right piston rod of the horizontal compression cylinder, the vertical pressure heads on the left and right are driven to telescope by the left and right vertical compression cylinders respectively, and the front and rear pressure heads on the left and right are driven to telescope by the left and right front and rear compression cylinders respectively.

[0069] The structures and relative positions of the connections between the oil cylinders and the pressure heads may refer to the prior art and will not be described in detail here.

[0070] In addition, at the corresponding positions of the left and right packing devices and each oil cylinder of the packing machine, there are in-place detection elements for detecting whether the piston rods of each oil cylinder are in place. The in-place detection elements can be proximity switches, etc. For example, proximity switches SQ3, SQ2 (SQ2 is used to provide an action signal for the horizontal compression oil cylinder), SQ1 are used to detect the initial position (i.e., the position before extension, and returning to the initial position can be called return), extension to the middle position, and extension to the final position of the piston rods of the left vertical compression oil cylinder, the right vertical compression oil cylinder, the left front and rear compression oil cylinder, and the right front and rear compression oil cylinder; proximity switches SQ4 are used to detect that the left piston rod of the horizontal compression oil cylinder is extended to the final position; proximity switches SQ6 are used to detect that the right piston rod of the horizontal compression oil cylinder is extended to the final position; and proximity switches SQ5 are used to detect that the left piston rod and the right piston rod have reached the middle position of the horizontal compression oil cylinder (i.e., the initial position, which is also the position before extension). Among them, the structure of using in-place detection elements to detect the position of each oil cylinder can refer to the existing technology.

[0071] S12, connect in series the corresponding oil cylinders for controlling the vertical pressure head of the left packing device and the right packing device, and the telescopic movement of the front and rear pressure heads

[0072] After connecting each pressure head with each oil cylinder, the corresponding oil cylinders for controlling the vertical pressure head of the left packing device and the right packing device and the telescopic movement of the front and rear pressure heads are connected in series, including:

[0073] A left front and rear compression oil cylinder with a rod chamber for driving the front and rear pressure heads in the left packing device to move telescopically and a right front and rear compression oil cylinder with a rod chamber for driving the front and rear pressure heads in the right packing device to move telescopically are connected in series;

[0074] A left vertical compression oil cylinder with a rod chamber for driving the telescopic movement of a vertical pressure head in a left packing device and a right vertical compression oil cylinder with a rod chamber for driving the telescopic movement of a vertical pressure head in a right packing device are connected in series.

[0075] The present invention connects in series the corresponding cylinders that respectively control the telescopic movement of the vertical pressure heads and the front and rear pressure heads of the left and right packing devices, so that when any one of a pair of vertical compression cylinders or a pair of front and rear compression cylinders extends or retracts, the other cylinder of the corresponding group synchronously performs the opposite action, thereby realizing the synchronization of the action of the series cylinders and saving the flow time difference of the series cylinder oil circuit, which can significantly improve the cylinder action and the working efficiency of the baler.

[0076] It should be noted that after each cylinder is connected to each pressure head, the oil supply channel of the hydraulic system needs to be connected to the horizontal compression cylinder, the left front and rear compression cylinder, the right front and rear compression cylinder, the left vertical compression cylinder, and the right vertical compression cylinder to supply oil to each cylinder, including:

[0077] A first oil circuit is formed by a first hydraulic pump and a first one-way valve and a first electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the first hydraulic pump;

[0078] A second oil circuit is formed by a second hydraulic pump and a second one-way valve and a second electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the second hydraulic pump;

[0079] A third oil circuit is formed by a third hydraulic pump and a third one-way valve and a third electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the third hydraulic pump;

[0080] Connect the oil outlet pipelines of the three oil circuits together through a main pipeline;

[0081] The oil in the main pipeline is supplied to the horizontal compression cylinder through the first branch pipeline;

[0082] The oil in the main pipeline is supplied to the left front and rear compression cylinder and the right front and rear compression cylinder through the second branch pipeline;

[0083] The oil in the main pipeline is supplied to the left vertical compression cylinder and the right vertical compression cylinder through the third branch pipeline.

[0084] Among them, three hydraulic pumps are connected in series and driven by the engine of the baler. When the oil of the main pipeline is supplied to the corresponding oil cylinder through each branch pipeline, an electro-hydraulic reversing valve is respectively arranged on each branch pipeline, and a pressure detection element for detecting the pressure of the main pipeline is arranged on the main pipeline. The pressure detection element can be a mechanical pressure gauge, a pressure sensor, or a pressure gauge and a pressure sensor can be used together.

[0085] S02. By integrating a solenoid valve and a hydraulically controlled one-way valve in the oil circuit of the connecting chamber of each two cylinders connected in series, the oil in the connecting chamber can be replenished or released in time to ensure the synchronization of the cylinder movements.

[0086] Wherein, a solenoid valve and a hydraulically controlled one-way valve are respectively integrated in the oil circuit of the connecting cavity of each two oil cylinders connected in series, including:

[0087] A first electromagnetic reversing valve and a first hydraulically controlled one-way valve are provided between the front and rear cylinder communication chamber oil passages and the oil supply passages of the left front and rear compression cylinders and the right front and rear compression cylinders connected in series;

[0088] A second electromagnetic reversing valve and a second hydraulically controlled one-way valve are arranged between the vertical cylinder communication chamber oil path and the oil supply channel of the left vertical compression cylinder and the right vertical compression cylinder connected in series.

[0089] The present invention integrates a solenoid valve and a hydraulically controlled one-way valve in the connecting cavity of two oil cylinders connected in series, so as to realize accurate control of the oil volume in the connecting cavity. For example, when the oil volume is too much, the excess oil is drained through the coordinated work of the solenoid valve and the hydraulically controlled one-way valve; when the oil volume is insufficient, the oil volume is supplemented through the control of the two valves, so that the oil in the connecting cavity is replenished or released in time, ensuring that the pair of oil cylinders connected by the connecting cavity can move synchronously into place, that is, one oil cylinder extends into place and the other oil cylinder retracts into place, thereby ensuring the stable operation of the oil cylinders.

[0090] S03. By setting an electro-hydraulic valve in the oil circuit of the horizontal compression oil cylinder used to control the telescopic movement of the horizontal pressure head of the left packing device and the right packing device respectively, the horizontal compression oil cylinder can act independently relative to the two pairs of oil cylinders connected in series, so as to improve the working efficiency.

[0091] After connecting the left piston rod of the horizontal compression cylinder to the horizontal pressure head in the left packing device and the right piston rod to the horizontal pressure head in the right packing device, a fourth electro-hydraulic reversing valve is arranged between the left rod chamber where the left piston rod is housed, the right rod chamber where the right piston rod is housed and the oil supply channel of the horizontal compression cylinder.

[0092] Correspondingly, when the horizontal compression oil cylinder, the left front and rear compression oil cylinder, the right front and rear compression oil cylinder, the left vertical compression oil cylinder, and the right vertical compression oil cylinder are connected to the oil supply channel for supplying oil to each cylinder, it also includes:

[0093] The pressure oil provided by one of the three hydraulic pumps is supplied to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder through the fourth oil circuit, and a fourth electro-hydraulic reversing valve is arranged on the fourth oil circuit.

[0094] When the pressure oil provided by one of the three hydraulic pumps is supplied to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder through the fourth oil circuit, a pressure detection element for detecting the channel pressure is set on the fourth oil circuit. The pressure detection element can be a mechanical pressure gauge or a pressure sensor, and the pressure gauge and the pressure sensor can also be used together.

[0095] Among them, the vertical oil cylinder connecting chamber oil circuit and the front and rear oil cylinder connecting chamber oil circuit are respectively connected to the fourth oil circuit.

[0096] The present invention arranges an electro-hydraulic valve in the oil circuit of the horizontal compression cylinder for respectively controlling the telescopic movement of the horizontal pressure head of the left packaging device and the right packaging device. When the vertical compression cylinder or the front and rear compression cylinders perform high-pressure action (that is, when the cylinders are jointly supplied with oil by two hydraulic pumps), the oil in the oil leakage circuit of the low-pressure pump (that is, the unloaded hydraulic pump) can be introduced into the oil chamber of the horizontal compression cylinder, so that the horizontal compression cylinder can act independently relative to the vertical compression cylinder or the front and rear compression cylinders, and the low-pressure oil introduced by the low-pressure pump can be used to make the horizontal pressure head complete the idle stroke, thereby improving the working efficiency of the cylinder and the packaging machine.

[0097] In addition to providing the method for forming the hydraulic system of the double-bale straw baler, the present invention also provides a hydraulic system of the double-bale straw baler formed by the above method. Figure 2 , Figure 5-Figure 7 As shown, the hydraulic system includes: a pipeline connecting the corresponding oil cylinders for controlling the vertical pressure head of the left packing device and the right packing device, and the telescopic movement of the front and rear pressure heads in series (see Figure 5 ) so that the extension or retraction of any of the corresponding cylinders can simultaneously control the other cylinder; a solenoid valve and a hydraulically controlled one-way valve are respectively integrated in the oil circuit of the connecting cavity of each two cylinders connected in series, so that the oil in the connecting cavity can be replenished or released in time to ensure the synchronization of the cylinder movements (see Figure 6 ); an electro-hydraulic valve is provided in the oil circuit of the horizontal compression oil cylinder for controlling the telescopic movement of the horizontal pressure head of the left packing device and the right packing device respectively, so that the horizontal compression oil cylinder can act independently relative to the two pairs of oil cylinders connected in series, so as to improve the working efficiency (see Figure 7 ).

[0098] Specifically, Figure 2As shown, the hydraulic system of the present invention uses five cylinders, namely, a horizontal compression cylinder, a pair of vertical compression cylinders (i.e., a left vertical compression cylinder and a right vertical compression cylinder), and a pair of front and rear compression cylinders (i.e., a left front and rear compression cylinder and a right front and rear compression cylinder). The horizontal compression cylinder 18 uses a double-rod cylinder, i.e., the horizontal compression cylinder has a left piston rod 181 extending horizontally to the left and a right piston rod 182 extending horizontally to the right, which are arranged opposite to each other, while the left vertical compression cylinder 16, the right vertical compression cylinder 15, the left front and rear compression cylinder 13, and the right front and rear compression cylinder 14 are all single-rod cylinders. The pair of vertical compression cylinders are exactly the same, and the pair of front and rear compression cylinders are exactly the same.

[0099] The left piston rod 181 of the horizontal compression cylinder 18, the piston rod of the left vertical compression cylinder 16, and the piston rod of the left front and rear compression cylinder 13 are respectively connected to the horizontal pressure head 101, the vertical pressure head 102, and the front and rear pressure heads 103 in the left baling device of the double-bale straw baler on the left side, and the right piston rod 182 of the horizontal compression cylinder, the piston rod of the right vertical compression cylinder, and the piston rod of the right front and rear compression cylinder are respectively connected to the horizontal pressure head 201, the vertical pressure head 202, and the front and rear pressure heads 203 in the right baling device of the double-bale straw baler on the right side, so as to drive the telescopic movement of the horizontal pressure head on the left side through the left piston rod of the horizontal compression cylinder, drive the telescopic movement of the horizontal pressure head on the right side through the right piston rod of the horizontal compression cylinder, drive the telescopic movement of the vertical pressure heads on the left and right sides through the left and right vertical compression cylinders, and drive the telescopic movement of the front and rear pressure heads on the left and right sides through the left and right front and rear compression cylinders.

[0100] In addition, at the corresponding positions of the left and right packing devices of the packing machine and each oil cylinder, there are in-place detection elements for detecting whether the piston rods of each oil cylinder are in place, so as to determine whether the pressure heads connected to each oil rod have moved to the position. Each in-place detection element can be a displacement sensor or a proximity switch, etc., and a proximity switch is preferably used. For example, the proximity switches SQ3, SQ2 (SQ2 is used to provide an action signal for the horizontal compression oil cylinder), SQ1 are used to detect the initial position (i.e., the position before extension, and returning to the initial position can be called return), extension to the middle position, and extension to the final position of the piston rods of the left vertical compression oil cylinder, the right vertical compression oil cylinder, the left front and rear compression oil cylinder, and the right front and rear compression oil cylinder, the proximity switch SQ4 is used to detect that the left piston rod of the horizontal compression oil cylinder is extended to the final position, the proximity switch SQ6 is used to detect that the right piston rod of the horizontal compression oil cylinder is extended to the final position, and the proximity switch SQ5 is used to detect that the left piston rod and the right piston rod have reached the middle position of the horizontal compression oil cylinder (i.e., the initial position, which is also the position before extension). Among them, the structure of using the in-place detection element to detect the position of each oil cylinder can refer to the existing technology.

[0101] The present invention supplies oil to each oil cylinder through an oil supply channel with a triple pump, and the oil supply channel includes an oil tank and: a first oil circuit, including: a first hydraulic pump 2; a first check valve 8 and a first electromagnetic overflow valve 7 arranged in parallel on the oil outlet pipeline of the first hydraulic pump; a second oil circuit, including: a second hydraulic pump 3; a second check valve 6 and a second electromagnetic overflow valve 5 arranged in parallel on the oil outlet pipeline of the second hydraulic pump; a third oil circuit, including: a third hydraulic pump 4; a third check valve 28 and a third electromagnetic overflow valve arranged in parallel on the oil outlet pipeline of the third hydraulic pump, and the third electromagnetic overflow valve can adopt the same structure as the first and second electromagnetic overflow valves mentioned above, and can also adopt a structure composed of a tubular overflow valve 29 and a single-head electromagnetic reversing valve 30 (see Figure 2 ); a main pipeline connecting the oil outlet pipelines of the three oil circuits; a first branch pipeline connected in parallel and supplying the oil of the main pipeline to the horizontal compression cylinder, a second branch pipeline supplying the oil of the main pipeline to the left front and rear compression cylinders and the right front and rear compression cylinders, and a third branch pipeline supplying the oil of the main pipeline to the left vertical compression cylinder and the right vertical compression cylinder. The three hydraulic pumps are connected in series and driven by the engine 1 of the baler. Under the control of the control system, the three hydraulic pumps can work simultaneously or individually, thereby providing hydraulic oil of different pressure levels according to actual needs.

[0102] In addition, the oil supply channel also includes a fourth oil circuit, which can supply the pressure oil provided by one of the three hydraulic pumps to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder. A fourth electro-hydraulic reversing valve 21 is arranged in the left rod chamber, the right rod chamber and the fourth oil circuit of the horizontal compression cylinder, and a pressure detection element for detecting the pressure of the oil circuit is arranged on the fourth oil circuit. The pressure detection element can be a mechanical pressure gauge PS231, or a pressure sensor PG220, and the pressure gauge and the pressure sensor can also be used at the same time.

[0103] When oil is supplied to five oil cylinders through three branch pipelines, an electro-hydraulic reversing valve is respectively arranged on the three branch pipelines, i.e., the first electro-hydraulic reversing valve 19, the second electro-hydraulic reversing valve 9, and the third electro-hydraulic reversing valve 17, and a pressure detection element for detecting the pressure of the main pipeline is arranged on the main pipeline, and the pressure detection element can be a mechanical pressure gauge 26, or a pressure sensor 27, or a pressure gauge and a pressure sensor can be used together. Each electro-hydraulic reversing valve adopts a three-position four-way electro-hydraulic reversing valve. Each electromagnetic overflow valve can adopt a pilot electromagnetic overflow valve.

[0104] Among them, the pipelines connecting in series the corresponding cylinders for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices include: a front and rear cylinder connecting chamber oil circuit 33 connecting in series the rod chamber of the left front and rear compression cylinder for driving the telescopic movement of the front and rear pressure head in the left packing device and the rod chamber of the right front and rear compression cylinder for driving the telescopic movement of the front and rear pressure head in the right packing device; a vertical cylinder connecting chamber oil circuit 32 connecting in series the rod chamber of the left vertical compression cylinder for driving the telescopic movement of the vertical pressure head in the left packing device and the rod chamber of the right vertical compression cylinder for driving the telescopic movement of the vertical pressure head in the right packing device.

[0105] The vertical oil cylinder connecting chamber oil circuit and the front and rear oil cylinder connecting chamber oil circuit are connected to the fourth oil circuit respectively. A first electromagnetic reversing valve 25 and a first hydraulically controlled one-way valve 24 are arranged between the front and rear oil cylinder connecting chamber oil circuit and the fourth oil circuit; a second electromagnetic reversing valve 23 and a second hydraulically controlled one-way valve 22 are arranged between the vertical oil cylinder connecting chamber oil circuit and the fourth oil circuit. Both electromagnetic reversing valves are three-position four-way electromagnetic reversing valves.

[0106] Among them, the connecting chamber refers to the volume chamber of two oil cylinders connected in series, and the connecting chamber oil circuit refers to the oil circuit for supplying or unloading oil to the volume chamber. For example, the vertical oil cylinder connecting chamber refers to the volume chamber formed by connecting the rod chamber of the left vertical oil cylinder and the rod chamber of the right vertical oil cylinder in series, and the vertical oil cylinder connecting chamber oil circuit refers to the oil circuit for supplying or unloading oil to the vertical oil cylinder connecting chamber; the front and rear oil cylinder connecting chamber refers to the volume chamber formed by connecting the rod chamber of the left front and rear oil cylinder and the rod chamber of the right front and rear oil cylinder in series, and the front and rear oil cylinder connecting chamber oil circuit refers to the oil circuit for supplying or unloading oil to the front and rear oil cylinder connecting chamber.

[0107] When connected, the one-way valves on the first, second and third oil circuits are respectively arranged on the oil supply pipelines between the oil outlets of the three hydraulic pumps and the oil inlets of the electro-hydraulic reversing valves on the three branch pipelines, and the corresponding electromagnetic overflow valves connected in parallel with each one-way valve are arranged on the oil return pipelines between the oil outlets of each hydraulic pump and the oil return ports of the electro-hydraulic reversing valves on the three branch pipelines. For example, taking the first oil circuit as an example for explanation: the first one-way valve on the first oil circuit is arranged on the oil supply pipeline between the oil outlet of the first hydraulic pump and the oil inlets of the first electro-hydraulic reversing valve, the second electro-hydraulic reversing valve and the third electro-hydraulic reversing valve on the three branch pipelines, and the first electromagnetic overflow valve is arranged on the oil return pipeline between the oil outlet of the first hydraulic pump and the oil return ports of the first electro-hydraulic reversing valve, the second electro-hydraulic reversing valve and the third electro-hydraulic reversing valve.

[0108] The working oil port A of the first electro-hydraulic reversing valve is connected to the left rod chamber A1 of the horizontal compression cylinder, the working oil port B of the first electro-hydraulic reversing valve is connected to the right rod chamber B1 of the horizontal compression cylinder, and the return oil port of the first electro-hydraulic reversing valve is connected to the oil tank.

[0109] The working oil port A of the second electro-hydraulic reversing valve is connected to the rodless chamber A3 of the left front and rear compression cylinder, the working oil port B of the second electro-hydraulic reversing valve is connected to the rodless chamber B3 of the right front and rear compression cylinder, and the oil return port of the second electro-hydraulic reversing valve is connected to the oil tank.

[0110] The working oil port A of the third electro-hydraulic reversing valve is connected to the rodless chamber A2 of the left vertical compression cylinder, the working oil port B of the third electro-hydraulic reversing valve is connected to the rodless chamber B2 of the right vertical compression cylinder, and the oil return port of the second electro-hydraulic reversing valve is connected to the oil tank.

[0111] The oil inlet P of the fourth electro-hydraulic reversing valve is connected to the oil outlet of one of the three hydraulic pumps, for example, see Figure 2 , connected to the oil outlet of the second hydraulic pump, the working oil port A is connected to the left rod chamber of the horizontal compression cylinder, the working oil port B is connected to the right rod chamber of the horizontal compression cylinder, and the oil return port T is connected to the oil tank.

[0112] The oil inlet P of the first electromagnetic reversing valve is connected to the oil outlet of the hydraulic pump for supplying oil to the fourth electro-hydraulic reversing valve (such as Figure 2 The working oil port A is connected to the oil inlet A of the first hydraulically controlled one-way valve, the working oil port B is connected to the control port X of the first hydraulically controlled one-way valve, and the oil return port T is connected to the oil tank. The oil outlet B of the first hydraulically controlled one-way valve is connected to the front and rear connecting chambers of the rod chambers connecting the left front and rear compression cylinders and the right front and rear compression cylinders.

[0113] The oil inlet P of the second electromagnetic reversing valve is connected to the oil outlet of the hydraulic pump for supplying oil to the fourth electro-hydraulic reversing valve (such as Figure 2 The working oil port A is connected to the oil inlet A of the second hydraulic control one-way valve, the working oil port B is connected to the control port X of the second hydraulic control one-way valve, and the oil return port T is connected to the oil tank. The oil outlet B of the second hydraulic control one-way valve is connected to the vertical connecting cavity of the rod cavity connecting the left vertical compression cylinder and the right vertical compression cylinder.

[0114] In addition to the above-mentioned components, the hydraulic system of the present invention is also provided with in-place detection components for detecting whether the piston rods of each oil cylinder are in place at the corresponding positions of the left and right packing devices of the packing machine and each oil cylinder, so as to determine whether the pressure head connected to each oil rod has moved to the place. Each in-place detection component can be a displacement sensor or a proximity switch, etc., and the proximity switch is preferably used. For example, the proximity switches SQ3, SQ2 (SQ2 is used to provide an action signal for the horizontal compression oil cylinder), SQ1 for detecting the initial position (i.e., the position before extension, and returning to the initial position can be called return), extension to the middle position, and extension to the final position of the piston rods of the left vertical compression oil cylinder, the right vertical compression oil cylinder, the left front and rear compression oil cylinder, and the right front and rear compression oil cylinder, the proximity switch SQ4 for detecting that the left piston rod of the horizontal compression oil cylinder is extended to the final position, the proximity switch SQ6 for detecting that the right piston rod of the horizontal compression oil cylinder is extended to the final position, and the proximity switch SQ5 for detecting that the left piston rod and the right piston rod reach the middle position (i.e., the initial position, which is also the position before extension) of the horizontal compression oil cylinder. Among them, the structure of using the in-place detection element to detect the position of each cylinder can refer to the existing technology.

[0115] The straw baler using the hydraulic system of the present invention may encounter different situations during operation, which are described below respectively.

[0116] In general, if the baler control system first obtains that the weight of the straw in the baling bin of one of the left baling device and the right baling device reaches the preset weight value first, and after controlling this baling device to complete the straw baling, it obtains that the weight of the straw in the baling bin of the other baling device reaches the preset weight value, then the five cylinders of the hydraulic system will cause the piston rod, vertical compression cylinder, and front and rear compression cylinders of the horizontal compression cylinder corresponding to the baling device that reaches the preset weight value first to move, and then cause the piston rod, vertical compression cylinder, and front and rear compression cylinders of the horizontal compression cylinder corresponding to the baling device that reaches the preset weight value later to move in sequence, so as to drive the horizontal, vertical, and front and rear pressure heads in the baling device that reaches the preset weight value first to move, and then drive the horizontal, vertical, and front and rear pressure heads in the baling device that reaches the preset weight value later to move in a cyclical sequence. Among them, the above-mentioned sequence of actions can be called set sequence actions.

[0117] For example, the weight of the straw in the baling bin of the left baling device reaches the preset weight value first, and after the baling of the straw by the left baling device is completed, the weight of the straw in the baling bin of the right baling device reaches the preset weight value, then the cylinders of the hydraulic system of the present invention perform cyclic actions in the order of the left piston rod of the horizontal compression cylinder extending to the left - the piston rod of the left vertical compression cylinder extending downward - the piston rod of the left front and rear compression cylinder pushing forward - the right piston rod of the horizontal compression cylinder extending to the right - the piston rod of the right vertical compression cylinder extending downward - the piston rod of the right front and rear compression cylinder pushing forward - the left piston rod of the horizontal compression cylinder extending to the left..., so as to drive the straw baler to baling the straw in the order of first horizontal squeezing of the left baling device - vertical squeezing - front and rear squeezing and pushing out, then horizontal squeezing of the right baling device - vertical squeezing - front and rear squeezing and pushing out - horizontal squeezing of the left baling device..., and the specific process is as follows:

[0118] 1. The horizontal pressure head in the left baling device compresses the straw in the baling bin horizontally.

[0119] When the baler control system obtains that the weight of the straw in the baling bin of the left baling device has reached the preset weight value, while the weight of the straw in the baling bin of the right baling device has not reached the preset weight value, the control system controls the electromagnetic overflow valves on the first, second and third oil circuits to be energized at the same time, the second and third electro-hydraulic reversing valves on the second and third branch pipelines are not energized, the electromagnet on the right side of the first electro-hydraulic reversing valve is energized, and the three hydraulic pumps work at the same time. At this time, the hydraulic oil provided by the three hydraulic pumps flows to the main pipeline through the one-way valves on the three oil circuits respectively, and flows to the oil supply port of the first electro-hydraulic reversing valve through the first branch pipeline. The oil flows out through the working oil port B of the first electro-hydraulic reversing valve and enters the right rod chamber B1 of the horizontal compression cylinder, so that the right piston rod of the horizontal compression cylinder moves to the left, and the left piston rod of the horizontal compression cylinder moves to the left accordingly, so that the left piston rod extends and drives the horizontal pressure head in the left baling device to compress the straw in the left baling bin in the horizontal direction;

[0120] During the process of the horizontal pressure head in the left baling device compressing the straw, when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches a first preset pressure value, one of the three hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the second hydraulic pump is powered off, the oil supplied by the second hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the other two hydraulic pumps continue to provide pressurized oil so that the left piston drives the horizontal pressure head in the left baling device to continue compressing the straw in the left baling bin; when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches a second preset pressure value At this time, one of the two hydraulic pumps is unloaded (for example, the electromagnetic overflow valve connected to the first hydraulic pump is cut off from power, and the oil supplied by the first hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the last hydraulic pump (such as the third hydraulic pump) continues to provide pressurized oil until the proximity switch SQ4 detects that the left piston rod of the horizontal compression cylinder is extended to the final position (referred to as extended to the end position), and the right electromagnet of the first electro-hydraulic reversing valve is controlled to be cut off from power, then the left piston rod of the horizontal compression cylinder will no longer continue to extend, that is, the horizontal pressure head of the left baling device stops compressing the straw in the left baling bin.

[0121] 2. The vertical pressure head in the left baling device compresses the straw in the baling bin downwards

[0122] Before or at the same time when the horizontal pressure head of the left baling device stops the horizontal compression action on the straw in the left baling bin, the control system controls the electromagnetic overflow valves on the first, second and third oil circuits to be energized at the same time, the first and second electro-hydraulic reversing valves on the first and second branch pipelines are not energized, the electromagnet on the left side of the third electro-hydraulic reversing valve is energized, and hydraulic oil is provided simultaneously through three hydraulic pumps. The hydraulic oil flows to the main pipeline through the one-way valves on the three oil circuits respectively, and flows to the oil supply port of the third electro-hydraulic reversing valve through the third branch pipeline. The oil flows out through the working oil port A of the third electro-hydraulic reversing valve and enters the rodless chamber A2 of the left vertical compression cylinder, so that the piston rod of the left vertical compression cylinder moves downward, driving the vertical pressure head in the left baling device to compress the straw in the left baling bin downward;

[0123] In the process of the vertical pressure head in the left baling device compressing the straw downward, when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the first preset pressure value, one of the three hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the second hydraulic pump is de-energized, the oil supplied by the second hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the other two hydraulic pumps continue to provide pressurized oil, so that the piston rod of the left vertical compression oil cylinder drives the vertical pressure head in the left baling device to continue to compress the straw in the left baling bin downward; when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches When the second preset pressure value is reached, one of the two hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the first hydraulic pump is powered off, the oil supplied by the first hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the last hydraulic pump (such as the third hydraulic pump) continues to provide pressurized oil until the proximity switch SQ1 detects that the piston rod of the left vertical compression cylinder is extended to the final position (referred to as extended to the end position), and the third electro-hydraulic reversing valve is controlled to be powered off, then the piston rod of the left vertical compression cylinder will no longer continue to extend, that is, the vertical pressure head of the left baling device stops compressing the straw in the left baling bin downward.

[0124] 3. The front and rear pressure heads in the left baling device compress the straw in the baling bin

[0125] Before or at the same time as the left vertical pressure head of the left baling device stops the vertical compression action on the straw in the left baling bin, the control system controls the electromagnetic overflow valves on the first, second and third oil circuits to be energized at the same time, the first and third electro-hydraulic reversing valves on the first and third branch pipelines are not energized, the electromagnet on the left side of the second electro-hydraulic reversing valve is energized, and hydraulic oil is provided simultaneously through three hydraulic pumps. The hydraulic oil flows to the main pipeline through the one-way valves on the three oil circuits respectively, and flows to the oil supply port of the second electro-hydraulic reversing valve through the second branch pipeline. The oil flows out through the working oil port A of the second electro-hydraulic reversing valve and enters the rodless chamber A3 of the left front and rear compression cylinder, so that the piston rod of the left front and rear compression cylinder moves forward, driving the front and rear pressure heads in the left baling device to compress and push out the straw in the left baling bin forward;

[0126] In the process of the front and rear pressure heads in the left baling device compressing and pushing the straw forward, when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the first preset pressure value, one of the three hydraulic pumps is unloaded (for example, the electromagnetic overflow valve connected to the second hydraulic pump is powered off, and the oil supplied by the second hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the other two hydraulic pumps continue to provide pressurized oil, so that the piston rods of the left front and rear compression cylinders drive the front and rear pressure heads in the left baling device to continue to push the straw in the left baling bin forward; when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the second preset pressure value When the value is reached, one of the two hydraulic pumps is unloaded (for example, the electromagnetic overflow valve connected to the first hydraulic pump is de-energized, and the oil supplied by the first hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the last hydraulic pump (such as the third hydraulic pump) continues to be used to provide pressurized oil until the proximity switch SQ1 detects that the piston rod of the left front and rear compression cylinder is extended to the final position (referred to as extended to the end position), and the third electro-hydraulic reversing valve is controlled to be de-energized, then the piston rod of the left front and rear compression cylinder will no longer continue to extend, that is, the front and rear pressure heads of the left baling device stop pushing the straw in the left baling bin forward, and at this time the straw in the left baling bin is pushed out of the baling bin.

[0127] 4. The horizontal pressure head in the right baling device compresses the straw in the baling bin horizontally.

[0128] When the front and rear pressure heads of the left baling device compress the straw in the left baling bin into place and push it forward, if the baler control system obtains that the weight of the straw in the baling bin of the right baling device reaches the preset weight value, the control system controls the electromagnetic overflow valves on the first, second and third oil circuits to be energized at the same time, and the second and third electro-hydraulic reversing valves on the second and third branch pipelines are not energized, the electromagnet on the left side of the first electro-hydraulic reversing valve is energized, and the three hydraulic pumps work at the same time. At this time, the hydraulic oil provided by the three hydraulic pumps flows to the main pipeline through the one-way valves on the three oil circuits respectively, and flows to the oil supply port of the first electro-hydraulic reversing valve through the first branch pipeline. The oil flows out through the working oil port A of the first electro-hydraulic reversing valve and enters the left rod chamber A1 of the horizontal compression cylinder, so that the left piston rod of the horizontal compression cylinder moves to the right, and the right piston rod of the horizontal compression cylinder moves to the right accordingly, so that the right piston rod extends and drives the horizontal pressure head in the right baling device to compress the straw in the right baling bin in the horizontal direction;

[0129] During the process of the horizontal pressure head in the right baling device compressing the straw, when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the first preset pressure value, one of the three hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the second hydraulic pump is powered off, the oil supplied by the second hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the other two hydraulic pumps continue to provide pressurized oil so that the right piston rod drives the horizontal pressure head in the right baling device to continue compressing the straw in the right baling bin; when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the second preset pressure value At this time, one of the two hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the first hydraulic pump is powered off, the oil supplied by the first hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the last hydraulic pump (such as the third hydraulic pump) continues to provide pressurized oil until the proximity switch SQ6 detects that the right piston rod of the horizontal compression cylinder is extended to the final position (referred to as extended to the end position), and the left electromagnet of the first electro-hydraulic reversing valve is controlled to be powered off, then the right piston rod of the horizontal compression cylinder will no longer continue to extend, that is, the horizontal pressure head of the right baling device stops compressing the straw in the right baling bin.

[0130] 5. The vertical pressure head in the right baling device compresses the straw in the baling bin downwards

[0131] Before or at the same time when the horizontal pressure head of the right baling device stops the horizontal compression action on the straw in the right baling bin, the control system controls the electromagnetic overflow valves on the first, second and third oil circuits to be energized at the same time, the first and second electro-hydraulic reversing valves on the first and second branch pipelines are not energized, the electromagnet on the right side of the third electro-hydraulic reversing valve is energized, and hydraulic oil is provided simultaneously through three hydraulic pumps. The hydraulic oil flows to the main pipeline through the one-way valves on the three oil circuits respectively, and flows to the oil supply port of the third electro-hydraulic reversing valve through the third branch pipeline. The oil flows out through the working oil port B of the third electro-hydraulic reversing valve and enters the rodless chamber B2 of the right vertical compression cylinder, so that the piston rod of the right vertical compression cylinder moves downward, driving the vertical pressure head in the right baling device to compress the straw in the right baling bin downward;

[0132] In the process of the vertical pressure head in the right baling device compressing the straw downward, when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the first preset pressure value, one of the three hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the second hydraulic pump is de-energized, the oil supplied by the second hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the other two hydraulic pumps continue to provide pressurized oil, so that the piston rod of the right vertical compression oil cylinder drives the vertical pressure head in the right baling device to continue to compress the straw in the right baling bin downward; when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches When the second preset pressure value is reached, one of the two hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the first hydraulic pump is powered off, the oil supplied by the first hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the last hydraulic pump (such as the third hydraulic pump) continues to provide pressurized oil until the proximity switch SQ1 detects that the piston rod of the right vertical compression cylinder is extended to the final position (referred to as extended to the end position), and the third electro-hydraulic reversing valve is controlled to be powered off, then the piston rod of the right vertical compression cylinder will no longer continue to extend, that is, the vertical pressure head of the right baling device stops compressing the straw in the right baling bin downward.

[0133] 6. The front and rear pressure heads in the right baling device compress the straw in the baling bin

[0134] Before or at the same time as the right vertical pressure head of the right baling device stops the vertical compression action on the straw in the right baling bin, the control system controls the electromagnetic overflow valves on the first, second and third oil circuits to be energized at the same time, the first and third electro-hydraulic reversing valves on the first and third branch pipelines are not energized, the right electromagnet of the second electro-hydraulic reversing valve is energized, and hydraulic oil is provided simultaneously through three hydraulic pumps. The hydraulic oil flows to the main pipeline through the one-way valves on the three oil circuits respectively, and flows to the oil supply port of the second electro-hydraulic reversing valve through the second branch pipeline. The oil flows out through the working oil port B of the second electro-hydraulic reversing valve and enters the rodless chamber B3 of the right front and rear compression cylinder, so that the piston rod of the right front and rear compression cylinder moves forward, driving the front and rear pressure heads in the right baling device to compress the straw in the right baling bin forward;

[0135] In the process of the front and rear pressure heads in the right baling device compressing and pushing the straw forward, when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the first preset pressure value, one of the three hydraulic pumps is unloaded (for example, if the electromagnetic overflow valve connected to the second hydraulic pump is powered off, the oil supplied by the second hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the other two hydraulic pumps continue to provide pressurized oil, so that the piston rods of the right front and rear compression cylinders drive the front and rear pressure heads in the right baling device to continue to push the straw in the right baling bin forward; when the pressure sensor on the main pipeline detects that the pressure on the pipeline reaches the second preset pressure value When the value is reached, one of the two hydraulic pumps is unloaded (for example, the electromagnetic overflow valve connected to the first hydraulic pump is de-energized, and the oil supplied by the first hydraulic pump will flow through the electromagnetic overflow valve back to the oil tank), and the last hydraulic pump (such as the third hydraulic pump) continues to provide pressurized oil until the proximity switch SQ1 detects that the piston rod of the right front and rear compression cylinder is extended to the final position (referred to as extended to the end position), and the third electro-hydraulic reversing valve is controlled to be de-energized, then the piston rod of the right front and rear compression cylinder will no longer continue to extend, that is, the front and rear pressure heads of the right baling device stop pushing the straw in the right baling bin forward, and at this time the straw in the right baling bin is pushed out of the baling bin.

[0136] It should be noted that since the left and right vertical compression cylinders are connected in series, and the left and right front and rear compression cylinders are also connected in series, therefore, in the working process of 1-6 above, when one of the left and right vertical compression cylinders is extended, the other vertical compression cylinder is synchronously and automatically returned. Similarly, when one of the left and right front and rear compression cylinders is extended, the other horizontal compression cylinder is synchronously and automatically returned, thereby realizing the synchronization of the actions of each pair of cylinders, saving the flow time difference of the oil circuit when the cylinders are extended and returned, improving the working efficiency of the hydraulic system, and thus improving the working efficiency of the baling machine.

[0137] If the baler control system obtains that the weight of the straw in the baling bin of another baling device has reached a preset weight value after one baling device squeezes the straw horizontally and before it pushes it forward to the baling bin, the control system will control the hydraulic system of the present invention to operate so that the vertical, front and rear compression cylinders or only the front and rear compression cylinders corresponding to the original baling device continue to perform the action, so that the vertical, front and rear pressure heads or only the front and rear pressure heads of the original baling device continue to perform the set actions of the above six steps. At the same time, the original action piston rod in the horizontal compression cylinder is controlled to return to its position.

[0138] For example, when the weight of the straw in the baling bin of the left baling device reaches the preset weight value first, and during the downward pressure of the vertical pressure head of the left baling device, the weight of the straw in the baling bin of the right baling device reaches the preset weight value, the control system will control the hydraulic system to execute steps 1 and 2 above first, and when the information that the piston rod of the left vertical compression cylinder has extended to the middle position is obtained, that is, when the feedback signal of the proximity switch SQ2 for detecting the middle position of the piston rod of the left vertical compression cylinder is received, a hydraulic pump such as the second hydraulic pump is controlled to unload, and the unloaded oil enters the pressure oil port of the fourth electro-hydraulic reversing valve, and flows out from the working oil port A of the fourth electro-hydraulic reversing valve and enters the left rod chamber of the horizontal compression cylinder, so that the left piston rod of the horizontal compression cylinder returns to its position, and at the same time, the piston rod of the left vertical compression cylinder is controlled to continue to extend downward.

[0139] It can be seen that by arranging the fourth electro-hydraulic reversing valve in the fourth oil circuit of the horizontal compression cylinder used to respectively control the telescopic movement of the horizontal pressure head of the left packing device and the right packing device, the oil in the oil leakage circuit of the low-pressure pump (i.e., the hydraulic pump after unloading) can be introduced into the oil chamber of the horizontal compression cylinder, so that the horizontal compression cylinder can move independently relative to the vertical compression cylinder or the front and rear compression cylinders, thereby improving the working efficiency of the cylinder.

[0140] Under normal use, the vertical cylinder connecting chamber formed by connecting the left and right vertical compression cylinders and the front and rear cylinder connecting chamber formed by connecting the left and right front and rear compression cylinders have no oil inflow or oil return, and the hydraulic oil will flow in the vertical cylinder connecting chamber and the front and rear cylinder connecting chamber respectively. However, if one of the pair of vertical compression cylinders and / or one of the pair of front and rear compression cylinders leaks outward (referred to as leakage) or infiltrates inward (referred to as infiltration) due to the long use of the hydraulic system or other reasons, the oil in the corresponding cylinder connecting chamber will become less or more, which will cause the piston rod of one of the pair of cylinders to move into place, while the piston rod of the other cylinder cannot move into place. At this time, it is necessary to add or unload oil to the corresponding cylinder connecting chamber.

[0141] To replenish or unload oil, a hydraulic pump such as the second hydraulic pump needs to be controlled to load. If replenishing oil, the right electromagnet of the electromagnetic reversing valve on the oil circuit of the corresponding cylinder connecting chamber to be replenished is energized, and the control port X of the hydraulic control check valve is not connected to the pressure oil. The oil from the oil pump will flow out from the working oil port A of the electromagnetic reversing valve, flow into the oil inlet A of the hydraulic control check valve on the oil circuit, and then flow out from the oil outlet B of the hydraulic control check valve to the corresponding cylinder connecting chamber for replenishing oil; if unloading oil, the left electromagnet of the electromagnetic reversing valve on the oil circuit of the corresponding cylinder connecting chamber to be replenished is energized, and the control port X of the hydraulic control check valve is connected to the pressure oil. Then the oil in the corresponding cylinder connecting chamber will flow in from the oil outlet B of the hydraulic control check valve, flow out from the oil inlet A of the hydraulic control check valve, flow in through the working oil port B of the electromagnetic reversing valve, and then flow out from the return oil port T to the oil tank.

[0142] For example, when the control system controls the oil inlet of the left vertical compression cylinder, under normal circumstances, the piston rod of the left vertical compression cylinder is extended to the position (i.e., the control system obtains the in-position signal of the in-position switch SQ1 corresponding to the left vertical compression cylinder), while the piston rod of the right vertical compression cylinder should be retracted to the position (i.e., the control system obtains the in-position signal of the in-position switch SQ3 corresponding to the right vertical compression cylinder). However, if the piston rod of the right vertical compression cylinder has not been retracted to the position, it means that the oil in the vertical connecting chamber is less, and it is necessary to add oil to the vertical connecting chamber. If the piston rod of the right vertical compression cylinder has been retracted to the position, but the piston rod of the left vertical compression cylinder has not been extended to the position, it means that there is too much oil in the vertical connecting chamber, and the oil in the vertical connecting chamber needs to be unloaded.

[0143] When it is necessary to add oil to the vertical connecting cavity, the second hydraulic pump is controlled to load, the right electromagnet of the second electromagnetic reversing valve is energized, and the control port of the second hydraulic control one-way valve is not connected to the pressure oil, then the oil unloaded by the second hydraulic pump will flow into the pressure oil port P of the second electromagnetic reversing valve, flow out of the working oil port A, flow into the oil inlet A of the second hydraulic control one-way valve, and then flow out from the oil outlet B of the second hydraulic control one-way valve to the vertical oil cylinder connecting cavity. When the piston rod of the right vertical compression oil cylinder retreats to its position (that is, the control system obtains the in-position signal of the in-position switch SQ3 corresponding to the right vertical compression oil cylinder), the oil addition is stopped.

[0144] When the oil in the vertical connecting cavity needs to be drained, the second hydraulic pump is controlled to load, the left electromagnet of the second electromagnetic reversing valve is energized, and the control port of the second hydraulically controlled one-way valve is connected to the pressure oil, then the oil in the vertical oil cylinder connecting cavity will flow in from the oil outlet B of the second hydraulically controlled one-way valve, flow out from the oil inlet A of the second hydraulically controlled one-way valve, flow in through the working oil port B of the second electromagnetic reversing valve, and flow out from the oil return port T. When the piston rod of the left vertical compression oil cylinder is extended to the position (that is, the control system obtains the position signal of the position switch SQ1 corresponding to the left vertical compression oil cylinder), the oil draining stops.

[0145] It can be seen that the present invention respectively arranges a solenoid valve and a hydraulically controlled one-way valve in the connecting chambers of the two vertical compression cylinders and the two front and rear compression cylinders connected in series, so as to realize precise control of the oil amount in the corresponding connecting chamber, so that the oil in the connecting chamber can be replenished or released in time, ensuring that a pair of cylinders connected by the connecting chamber move in place synchronously, ensuring the stable operation of the corresponding cylinders, and ensuring the stable operation of the baling machine, so as to ensure the stable packaging quality.

[0146] Although the present invention has been described in detail above, the present invention is not limited thereto. Those skilled in the art can make modifications based on the principles of the present invention. Therefore, all modifications made based on the principles of the present invention should be understood to fall within the protection scope of the present invention.

Claims

1. A method for forming a hydraulic system of a double-bale straw baler, the double-bale straw baler comprising a left baling device and a right baling device, both of which have a horizontal pressure head, a vertical pressure head, and a front and rear pressure head, the method comprising: By connecting in series the corresponding oil cylinders for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices, the extension or retraction movement of any one of the corresponding oil cylinders can simultaneously control the other oil cylinder; By integrating a solenoid valve and a hydraulically controlled one-way valve in the oil circuit of the connecting chamber of each two oil cylinders connected in series, the oil in the connecting chamber can be replenished or released in time to ensure the synchronization of the oil cylinders; By arranging an electro-hydraulic valve in the oil circuit of the horizontal compression cylinder used to control the telescopic movement of the horizontal pressure head of the left packing device and the right packing device respectively, the horizontal compression cylinder can act independently relative to the two pairs of cylinders connected in series to improve work efficiency.

2. According to the method of claim 1, connecting in series the corresponding oil cylinders for respectively controlling the telescopic movement of the vertical pressing head and the front and rear pressing heads of the left and right packing devices, respectively, comprises: A left front and rear compression oil cylinder with a rod chamber for driving the front and rear pressure heads in the left packing device to move telescopically and a right front and rear compression oil cylinder with a rod chamber for driving the front and rear pressure heads in the right packing device to move telescopically are connected in series; A left vertical compression oil cylinder with a rod chamber for driving the telescopic movement of a vertical pressure head in a left packing device and a right vertical compression oil cylinder with a rod chamber for driving the telescopic movement of a vertical pressure head in a right packing device are connected in series.

3. The method according to claim 2, wherein a solenoid valve and a hydraulically controlled one-way valve are respectively integrated in the oil passages of the communicating cavities of each of the two oil cylinders connected in series, comprises: A first electromagnetic reversing valve and a first hydraulically controlled one-way valve are provided between the front and rear cylinder communication chamber oil passages and the oil supply passages of the left front and rear compression cylinders and the right front and rear compression cylinders connected in series; A second electromagnetic reversing valve and a second hydraulically controlled one-way valve are arranged between the vertical cylinder communication chamber oil path and the oil supply channel of the left vertical compression cylinder and the right vertical compression cylinder connected in series.

4. According to the method described in any one of claims 1 to 3, the electro-hydraulic valve is arranged in the oil circuit of the horizontal compression oil cylinder for respectively controlling the telescopic movement of the horizontal pressure head of the left packing device and the right packing device, comprising: A left piston rod for driving the horizontal pressure head in the left packing device to telescope left and right and a right piston rod for driving the horizontal pressure head in the right packing device to telescope left and right are placed in the horizontal compression cylinder in opposite directions; A fourth electro-hydraulic reversing valve is arranged between the left rod chamber, the right rod chamber and the oil supply channel of the horizontal compression oil cylinder.

5. The method according to claim 4, wherein the oil supply channel is connected with the horizontal compression cylinder, the left front and rear compression cylinder, the right front and rear compression cylinder, the left vertical compression cylinder, and the right vertical compression cylinder, and comprises: A first oil circuit is formed by a first hydraulic pump and a first one-way valve and a first electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the first hydraulic pump; A second oil circuit is formed by a second hydraulic pump and a second one-way valve and a second electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the second hydraulic pump; A third oil circuit is formed by a third hydraulic pump and a third one-way valve and a third electromagnetic relief valve which are arranged in parallel on the oil outlet pipeline of the third hydraulic pump; Connect the oil outlet pipelines of the three oil circuits together through a main pipeline; The oil in the main pipeline is supplied to the horizontal compression cylinder through the first branch pipeline; The oil in the main pipeline is supplied to the left front and rear compression cylinder and the right front and rear compression cylinder through the second branch pipeline; The oil in the main pipeline is supplied to the left vertical compression cylinder and the right vertical compression cylinder through the third branch pipeline.

6. According to the method of claim 5, when the oil in the main pipeline is supplied to the corresponding oil cylinder through each branch pipeline, an electro-hydraulic reversing valve is respectively arranged on each branch pipeline.

7. The method according to claim 5, further comprising: connecting the horizontal compression cylinder, the left front and rear compression cylinder, the right front and rear compression cylinder, the left vertical compression cylinder, and the right vertical compression cylinder to the oil supply passage for supplying oil to each cylinder respectively; The pressure oil provided by one of the three hydraulic pumps is supplied to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder through the fourth oil circuit.

8. According to the method of claim 4, when the pressure oil provided by one of the three hydraulic pumps is supplied to the left rod chamber and / or the right rod chamber of the horizontal compression cylinder through the fourth oil circuit, the fourth electro-hydraulic reversing valve is set in the fourth oil circuit.

9. The method according to claim 4, wherein the vertical oil cylinder connecting chamber oil circuit and the front and rear oil cylinder connecting chamber oil circuit are respectively connected to the fourth oil circuit.

10. A hydraulic system of a double-bale straw baler formed by the method according to any one of claims 1 to 9, comprising: A pipeline connecting corresponding oil cylinders in series for respectively controlling the telescopic movement of the vertical pressure head and the front and rear pressure heads of the left and right packing devices, so that the extension or retraction of any one of the corresponding oil cylinders can simultaneously control the other oil cylinder; A solenoid valve and a hydraulically controlled one-way valve are respectively integrated in the oil circuit of the connecting chamber of each two oil cylinders connected in series, so that the oil in the connecting chamber can be replenished or released in time to ensure the synchronization of the oil cylinders; An electro-hydraulic valve is arranged in the oil circuit of the horizontal compression cylinder for respectively controlling the telescopic movement of the horizontal pressure heads of the left and right packing devices, so that the horizontal compression cylinder can act independently relative to the two pairs of cylinders connected in series, so as to improve the working efficiency.

Images