A cotton harvester control system and cotton harvester

Abstract

The application discloses a cotton picker control system and a cotton picker, and relates to the technical field of cotton pickers. In the cotton picker control system, at least three action execution elements include an action execution element in the first position of an action time sequence, an action execution element in the last position of the action time sequence, and at least one action execution element in the middle position of the action time sequence; a power element is used for alternately driving the at least three action execution elements; a first switching valve is used for switching the on-off of an oil path of the action execution element in the first position of the action time sequence and an oil path of the at least one action execution element in the middle position of the action time sequence; and a second switching valve is used for switching the on-off of the oil path of the at least one action execution element in the middle position of the action time sequence and an oil path of the action execution element in the last position of the action time sequence. The cotton picker control system solves the problem that three gear pumps cannot be used to drive a slag blowing motor, a vane angle oil cylinder and a lubricating grease filling motor due to space limitation.

Description

Technical Field

[0001] This application relates to the field of cotton harvester technology, and in particular to a cotton harvester control system and a cotton harvester. Background Technology

[0002] Currently, cotton harvesters typically employ multiple large-displacement, high-pressure closed-loop and open-loop piston pumps that can adjust their displacement in real time according to demand in order to perform the main actions of cotton harvesting, walking, beating and flattening, conveying, baling, and bale-by-bale.

[0003] For auxiliary actions such as blowing debris from the engine intake filter, reverse-flushing the engine cooling fan impeller at a different angle, and grease application, although the required flow rates and pressures differ, they all fall under the category of low-to-medium pressure, low-flow-rate actions. In traditional designs, these auxiliary actions often require separate gear pumps to drive them individually to ensure the stability and reliability of each action. However, due to space limitations in the cotton harvester pump unit, it is not possible to use three gear pumps to separately drive the engine intake filter blowing motor, the engine cooling fan reverse-flushing cylinder, and the grease application motor.

[0004] Therefore, how to avoid the limitation of space in the cotton harvester pump set, which prevents the use of three gear pumps to drive the engine intake filter blower motor, the engine cooling fan backflush cylinder, and the grease filling motor respectively, is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a cotton harvester control system and a cotton harvester, which solves the problem that due to space limitations of the cotton harvester pump set, it is impossible to use three gear pumps to drive the engine intake filter blowing motor, the engine cooling fan back-blowing cylinder, and the grease filling motor respectively.

[0006] To achieve the above objectives, this application provides a cotton harvester control system, comprising:

[0007] At least three action execution elements, including the action execution element at the beginning of the action sequence, the action execution element at the end of the action sequence, and at least one action execution element in the middle of the action sequence.

[0008] A power element is connected to at least three motion actuators via oil circuits, and is used to alternately drive at least three motion actuators;

[0009] The first switching valve is connected to the oil circuit where the first sequential action actuator is located and the oil circuit where at least one sequential action actuator is located in the middle of the action sequence, and is used to switch the on / off state of the oil circuit where the first sequential action actuator is located and the oil circuit where at least one sequential action actuator is located in the middle of the action sequence.

[0010] The second switching valve is connected to the oil circuit where the actuator in the middle of the action sequence is located and the oil circuit where the actuator in the last position of the action sequence is located, and is used to switch the on / off state of the oil circuit where the actuator in the middle of the action sequence is located and the oil circuit where the actuator in the last position of the action sequence is located.

[0011] In some embodiments, the cotton harvester control system further includes a first relief valve, which is connected to the oil circuit of the first actuator in the action sequence and is used to limit the maximum working pressure of the first actuator in the action sequence.

[0012] In some embodiments, the cotton harvester control system further includes a second relief valve, which is connected to the oil circuit of at least one actuator in the middle of the action sequence, for limiting the maximum working pressure of the actuator in the middle of the action sequence, and the set pressure of the second relief valve is less than the set pressure of the first relief valve.

[0013] In some embodiments, the cotton harvester control system further includes a fixed throttle valve, which is located on the oil line of at least one actuator in the middle of the action sequence, and is used to limit the drive flow of the actuator in the middle of the action sequence within a preset range.

[0014] In some embodiments, the cotton harvester control system further includes an adjustable flow valve, which is located on the oil circuit of the actuator at the end of the action sequence, and is used to adjust the flow rate of the oil circuit of the actuator at the end of the action sequence in real time.

[0015] In some embodiments, the cotton harvester control system further includes an unloading valve and an oil tank. The unloading valve is connected to the oil outlet of the first switching valve and is used to deliver the pressurized oil output by the power element to the oil tank.

[0016] In some embodiments, the cotton harvester control system further includes:

[0017] The instruction receiving module is used to receive operation instructions from the operator;

[0018] The control module communicates with the command receiving module, the power element, the unloading valve, the first switching valve, and the second switching valve. It is used to control the operation of the power element, the unloading valve, the first switching valve, and the second switching valve according to the operation commands received by the command receiving module.

[0019] In some embodiments, the instruction receiving module includes:

[0020] Wireless controller, communicating with the control module;

[0021] Wired foot pedal, communicating with the control module;

[0022] The control module is configured to only drive the power element, unloading valve, first switching valve and second switching valve when the wireless handle and the wired foot pedal output the same operation command within a preset time; otherwise, the system will be locked and a command conflict will be indicated.

[0023] In some embodiments, the unloading valve, the first switching valve, and the second switching valve are all two-position four-way solenoid valves.

[0024] This application also provides a cotton harvester, including the cotton harvester control system of any of the above.

[0025] Compared to the aforementioned background technology, the cotton harvester control system provided in this application includes at least three actuating elements, a power element, a first switching valve, and a second switching valve. The at least three actuating elements include an actuating element that is first in the actuating sequence, an actuating element that is last in the actuating sequence, and at least one actuating element that is in the middle of the actuating sequence. The power element is connected to the at least three actuating elements via oil circuits, and is used to alternately drive the at least three actuating elements. The first switching valve is connected to the oil circuit containing the first actuating element and the oil circuit containing the at least one actuating element in the middle of the actuating sequence, and is used to switch the on / off state of the oil circuit containing the first actuating element and the oil circuit containing the at least one actuating element in the middle of the actuating sequence. The second switching valve is connected to the oil circuit containing the at least one actuating element in the middle of the actuating sequence and the oil circuit containing the last actuating element, and is used to switch the on / off state of the oil circuit containing the at least one actuating element in the middle of the actuating sequence and the oil circuit containing the last actuating element.

[0026] The main benefits of this cotton harvester control system include:

[0027] By switching the operation of the actuators in a predetermined sequence using a single power source and dual switching valves, the original three independent valve groups required for the sequential action of first → intermediate → last action are compressed into a single main oil circuit: the power source operates continuously, the first switching valve first connects the first sequential oil circuit and simultaneously cuts off the intermediate oil circuit, and when the intermediate oil circuit needs to be connected, it immediately switches to the intermediate oil circuit, and when the last sequential oil circuit needs to be connected, the second switching valve seamlessly transfers the pressure of the intermediate oil circuit to the last sequential oil circuit. In this way, without adding a power source, the sequential control of at least three actuators can be achieved in a structure-control integrated manner, which not only saves installation space but also reduces costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 This is a hydraulic schematic diagram of the cotton harvester control system in an embodiment of this application.

[0030] in:

[0031] 1-Unloading valve, 2-Slag blowing motor, 3-Blade angle cylinder, 4-Grease filling motor, 5-Adjustable flow valve, 6-Fixed throttle valve, 7-Power component, 8-First overflow valve, 9-First switching valve, 10-Second overflow valve, 11-Second switching valve. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0035] Please refer to Figure 1 , Figure 1 This is a hydraulic schematic diagram of the cotton harvester control system in an embodiment of this application.

[0036] The cotton harvester control system provided in this application includes at least three actuating elements, a power element 7, a first switching valve 9, and a second switching valve 11.

[0037] At least three action execution elements include the action execution element at the beginning of the action sequence, the action execution element at the end of the action sequence, and at least one action execution element in the middle of the action sequence.

[0038] Depending on the actual application scenario, the above-mentioned at least three motion actuators include a motion actuator that is at the beginning of the motion sequence (such as the slag blowing motor 2), a motion actuator that is at the end of the motion sequence (such as the grease filling motor 4), and a motion actuator that is in the middle of the motion sequence (such as the blade angle cylinder 3). Of course, in addition to the blade angle cylinder 3, the motion actuator in the middle of the motion sequence can also be a platform pedal tilting cylinder.

[0039] It should be noted that the sequence of actions of the aforementioned actuators is determined according to the duration and frequency of operation. For example, the filter element blowing action, which has a long operation time, is set as a normally controlled action, that is, the blowing motor 2 is set as the first actuator in the sequence; the fan blade angle pushing action, which is intermittent, is set as the second action, that is, the blade angle cylinder 3 is set as the middle actuator in the sequence; and the grease filling action for maintenance is set as the third action, that is, the grease filling motor 4 is set as the last actuator in the sequence.

[0040] When the system is working, according to the duration and frequency of operation, the slag blowing motor 2 is controlled first, then the blade angle cylinder 3 is controlled, and finally the grease filling motor 4 is controlled for maintenance. The maximum flow rate required by the slag blowing motor 2 among the three actions is selected as 38 L / min.

[0041] The power element 7 is connected to at least three actuators via oil circuits, and is used to alternately drive the at least three actuators. The power element 7 is specifically a gear pump.

[0042] The first switching valve 9 is connected to the oil circuit where the first sequential actuator in the action sequence is located and the oil circuit where at least one sequential actuator in the middle of the action sequence is located, and is used to switch the on / off state of the oil circuit where the first sequential actuator in the action sequence is located and the oil circuit where at least one sequential actuator in the middle of the action sequence is located.

[0043] Specifically, after the first switching valve 9 is energized, the first sequential action actuator (slag blowing motor 2) in the action sequence stops working and switches to the action actuator (blade angle cylinder 3) in the middle sequential position in the action sequence.

[0044] The second switching valve 11 is connected to the oil circuit where the actuator in the middle of the action sequence is located and the oil circuit where the actuator in the last position of the action sequence is located, and is used to switch the on / off state of the oil circuit where the actuator in the middle of the action sequence is located and the oil circuit where the actuator in the last position of the action sequence is located.

[0045] Specifically, after the second switching valve 11 is energized, the actuator (blade angle cylinder 3) in the middle of the action sequence stops working and switches to the actuator (grease filling motor 4) in the last position of the action sequence.

[0046] The cotton harvester control system, configured in this way, uses a single power source and dual switching valves to switch the operation of the actuators in a predetermined sequence. This compresses the time-sharing action from the first to the middle to the last, which originally required three independent valve groups, into a single main oil circuit. The power source 7 operates continuously, the first switching valve 9 first connects the first sequential oil circuit and simultaneously cuts off the middle oil circuit. When the middle oil circuit needs to be connected, it immediately switches to the middle oil circuit. When the last sequential oil circuit needs to be connected, the second switching valve 11 seamlessly transfers the pressure of the middle oil circuit to the last sequential oil circuit. In this way, without adding the power source 7, the sequential control of at least three actuators can be achieved in a structure-control integrated manner, which not only saves installation space but also reduces costs.

[0047] In some embodiments, the cotton harvester control system further includes a first overflow valve 8 (also called a main overflow valve), which is connected to the oil circuit of the blower motor 2 and is used to limit the maximum working pressure of the blower motor 2.

[0048] For example, the control scheme for the slag blowing motor 2 is as follows: the gear pump delivers pressurized oil → the first switching valve 9 is in its left position → the slag blowing motor 2 → the oil tank. The maximum system pressure is limited by the first relief valve 8, which is 9 MPa.

[0049] In some embodiments, the cotton harvester control system further includes a second overflow valve 10, which is connected to the oil circuit of the blade angle cylinder 3 and is used to limit the maximum working pressure of the blade angle cylinder 3. The set pressure of the second overflow valve 10 is less than the set pressure of the first overflow valve 8.

[0050] For example, the control scheme for the blade angle cylinder 3 is as follows: the first switching valve 9 is energized, the gear pump delivers pressurized oil → the first switching valve 9 is in the right position → the second switching valve 11 is in the left position → the blade angle cylinder 3 is pushed to switch the impeller movement angle to achieve backflushing. Among them, the second overflow valve 10 limits the maximum pressure of the cylinder movement to 5.5 MPa.

[0051] In some embodiments, the cotton harvester control system further includes a fixed throttle valve 6, which is located on the oil line of the blade angle cylinder 3 and is used to limit the driving flow of the blade angle cylinder 3 within a preset range.

[0052] For example, the fixed throttle valve 6 limits the cylinder drive flow rate to 20L / min.

[0053] In some embodiments, the cotton harvester control system further includes an adjustable flow valve 5, which is located on the oil line of the grease filling motor 4 and is used to adjust the flow rate of the oil line of the grease filling motor 4 in real time.

[0054] For example, the control scheme for the grease filling motor 4 is as follows: the first switching valve 9 and the second switching valve 11 are energized. The gear pump delivers pressurized oil → the first switching valve 9 is in the right position → the second switching valve 11 is in the right position → the adjustable flow valve 5 → the grease filling motor 4, driving the motor to perform oil pumping operations. Among them, the adjustable flow valve 5 can adjust the oil pumping speed of the motor in real time, and the second relief valve 10 limits the maximum pressure of the oil cylinder movement to 5.5 MPa.

[0055] In some embodiments, the cotton harvester control system further includes an unloading valve 1 and an oil tank, wherein the unloading valve 1 is connected to the oil outlet of the first switching valve 9 (e.g., Figure 1 As shown, the oil inlet and outlet of the unloading valve 1 are connected to the oil outlet of the first switching valve 9 and the oil outlet of the slag blowing motor 2, respectively, and are used to deliver the pressure oil output by the power element 7 to the oil tank.

[0056] To prevent equipment from starting under load, the system should have a start-up unloading function, or an unloading function when the equipment does not need to be started during non-operational periods.

[0057] Based on this, this application sets up an unloading valve 1. The system unloading scheme is as follows: when the power is started or in a non-operational state, the unloading valve 1 is energized, and the gear pump outputs pressure oil through the left position of the first switching valve 9 → the right position of the unloading valve 1 → the oil outlet of the slag blowing motor 2 → the oil tank, thereby achieving unloading.

[0058] In some embodiments, the unloading valve 1, the first switching valve 9, and the second switching valve 11 are all two-position four-way solenoid valves.

[0059] In some embodiments, the cotton harvester control system further includes an instruction receiving module and a control module.

[0060] The instruction receiving module is used to receive operation instructions from the operator; the control module communicates with the instruction receiving module, the power element 7, the unloading valve 1, the first switching valve 9 and the second switching valve 11, and the control module is used to control the operation of the power element 7, the unloading valve 1, the first switching valve 9 and the second switching valve 11 according to the operation instructions received by the instruction receiving module.

[0061] By adding a command receiving module and a control module, the system is upgraded from a mechanical-hydraulic sequence to a command-electronic closed-loop control: the operator sends a combined action code for cotton picking, walking, and packing with a single click through the command receiving module. The control module immediately parses the code into a multi-dimensional electrical signal representing the corresponding power element displacement, unloading valve duty cycle, and first / second switching valve timing, achieving millisecond-level synchronous adjustment. Since electronic signals are much faster than mechanical hydraulic control, the response time of the first, middle, and last oil circuits is significantly shortened. Simultaneously, the control module can reduce the displacement of power element 7 and open unloading valve 1 in real time according to the operation command, reducing ineffective overflow to near zero, further reducing system temperature rise and achieving energy savings. Furthermore, the electronic closed loop can sample the pressure peak after each reversal; if it exceeds a set threshold, it automatically corrects the valve core opening rate for the next cycle, thereby stabilizing pressure surges within a preset range and extending the service life of the components.

[0062] Furthermore, the command receiving module supports wireless / wired dual-channel redundancy, and only executes actions when the commands from both channels are consistent, completely eliminating accidental unloading or switching caused by single-channel mis-touch.

[0063] In some embodiments, the instruction receiving module includes a wireless handle and a wired foot pedal. The wireless handle communicates with the control module; the wired foot pedal communicates with the control module; the control module is configured to execute the drive of the power element 7, the unloading valve 1, the first switching valve 9, and the second switching valve 11 only when the wireless handle and the wired foot pedal output consistent operation instructions within a preset time; otherwise, it triggers system lockout and prompts an instruction conflict.

[0064] It can be seen that the command receiving module adopts a dual-channel redundant architecture of wireless controller + wired foot pedal, and the control module is configured to trigger the drive signal only when it receives two completely identical operation commands within a preset time window; otherwise, the system is immediately locked and a conflict is indicated. Because wireless signals are susceptible to interference from obstructions and foot pedals may become mechanically stuck, the probability of simultaneous false transmissions with identical content from both channels is greatly reduced, thus improving reliability. Simultaneously, the control module can achieve millisecond-level time window judgment, which eliminates human error differences (time difference between left and right hand / foot movements), ensuring continuous normal operation and completely preventing secondary accidents such as sudden pressure surges in power component 7, accidental opening of unloading valve 1, or abnormal reversal of the first switching valve 9 / second switching valve 11 caused by accidental touch of the handle or foot pedal. This avoids secondary accidents such as cotton picking head falling or fan reversal damaging the radiator. After locking, the system maintains the current oil circuit state, and the engine remains idle, allowing the operator to immediately reconfirm commands without emergency shutdown, reducing downtime and restart time. Furthermore, the dual-channel architecture allows for safe actions such as slow return to position using the wired foot pedal when the wireless handle's battery is depleted, achieving a single-fault, still controllable failure safety principle.

[0065] In summary, the introduction of the command receiving module and control module enables the simplified oil circuit and intelligent electronic control to achieve hardware and software synergy, further enhancing the advantages of shorter cycle time, lower energy consumption, less impact, and higher safety on top of the original integrated structure-control benefits. Meanwhile, the adopted dual-channel mutual calibration mechanism minimizes the risk of misoperation at the human-machine-hydraulic interface without increasing hardware costs.

[0066] In summary, the control scheme of the cotton harvester control system described in the above specific embodiments is as follows:

[0067] The system unloading scheme is as follows: when the power is started or in a non-operational state, the unloading valve 1 is energized, and the gear pump outputs pressure oil through the left position of the first switching valve 9 → the right position of the unloading valve 1 → the oil outlet of the slag blowing motor 2 → the oil tank, thereby achieving unloading.

[0068] The control scheme for the slag blowing motor 2 is as follows: the unloading valve 1 is de-energized, the gear pump delivers pressurized oil → the first switching valve 9 is in the left position → the slag blowing motor 2 → the oil tank. The maximum system pressure is limited by the first relief valve 8, which is 9 MPa.

[0069] The control scheme for the blade angle cylinder 3 is as follows: the unloading valve 1 is de-energized, the first switching valve 9 is energized, the gear pump delivers pressurized oil → the first switching valve 9 is in the right position → the second switching valve 11 is in the left position → the fixed throttle valve 6 → the blade angle cylinder 3, which pushes the cylinder to switch the impeller movement angle to achieve backflushing. The fixed throttle valve 6 limits the cylinder drive flow rate to 20 L / min, and the second overflow valve 10 limits the maximum cylinder movement pressure to 5.5 MPa.

[0070] The control scheme for the grease filling motor 4 is as follows: the unloading valve 1 is de-energized, and the first switching valve 9 and the second switching valve 11 are energized. The gear pump delivers pressurized oil → the first switching valve 9 to the right position → the second switching valve 11 to the right position → the adjustable flow valve 5 → the grease filling motor 4, driving the motor to perform oil pumping operations. The adjustable flow valve 5 can adjust the motor's oil pumping speed in real time, and the second overflow valve 10 limits the maximum pressure of the oil cylinder movement to 5.5 MPa.

[0071] This application employs a gear pump to alternately drive three different actions: a slag-blowing motor 2, a blade angle cylinder 3, and a grease-filling motor 4. This satisfies the action sequence and flow rate requirements of the three actions: slag blowing from the cotton harvester filter element, fan blade angle pushing, and grease filling.

[0072] The cotton harvester provided in this application includes the cotton harvester control system described in the above specific embodiments; other parts of the cotton harvester can be referred to in related technologies, and will not be elaborated here.

[0073] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0074] The cotton harvester control system and cotton harvester provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A cotton harvester control system, characterized in that, include: At least three action execution elements, including the action execution element at the beginning of the action sequence, the action execution element at the end of the action sequence, and at least one action execution element in the middle of the action sequence. A power element is connected to the at least three motion actuators via oil circuits, and is used to alternately drive the at least three motion actuators; The first switching valve is connected to the oil circuit where the first sequential action actuator is located and the oil circuit where at least one sequential action actuator is located in the middle of the action sequence, and is used to switch the on / off state of the oil circuit where the first sequential action actuator is located and the oil circuit where at least one sequential action actuator is located in the middle of the action sequence. The second switching valve is connected to the oil circuit where the actuator in the middle of the action sequence is located and the oil circuit where the actuator in the last position of the action sequence is located, and is used to switch the on / off state of the oil circuit where the actuator in the middle of the action sequence is located and the oil circuit where the actuator in the last position of the action sequence is located.

2. The cotton harvester control system as described in claim 1, characterized in that, The cotton harvester control system also includes a first overflow valve, which is connected to the oil circuit of the first action actuator in the action sequence, and is used to limit the maximum working pressure of the first action actuator in the action sequence.

3. The cotton harvester control system as described in claim 2, characterized in that, The cotton harvester control system further includes a second overflow valve, which is connected to the oil circuit of the actuator located in the middle of the action sequence, and is used to limit the maximum working pressure of the actuator located in the middle of the action sequence, and the set pressure of the second overflow valve is less than the set pressure of the first overflow valve.

4. The cotton harvester control system as described in claim 1, characterized in that, The cotton harvester control system also includes a fixed throttle valve, which is located on the oil line of the actuator in the middle of the action sequence, and is used to limit the driving flow of the actuator in the middle of the action sequence within a preset range.

5. The cotton harvester control system as described in claim 1, characterized in that, The cotton harvester control system also includes an adjustable flow valve, which is located on the oil circuit of the actuator at the end of the action sequence and is used to adjust the flow rate of the oil circuit of the actuator at the end of the action sequence in real time.

6. The cotton harvester control system as described in any one of claims 1-5, characterized in that, The cotton harvester control system also includes an unloading valve and an oil tank. The unloading valve is connected to the oil outlet of the first switching valve and is used to deliver the pressurized oil output by the power element to the oil tank.

7. The cotton harvester control system as described in claim 6, characterized in that, The cotton harvester control system also includes: The instruction receiving module is used to receive operation instructions from the operator; The control module communicates with the instruction receiving module, the power element, the unloading valve, the first switching valve, and the second switching valve, and is used to control the power element, the unloading valve, the first switching valve, and the second switching valve to operate according to the operation instructions received by the instruction receiving module.

8. The cotton harvester control system as described in claim 7, characterized in that, The instruction receiving module includes: A wireless handle that communicates with the control module; A wired foot pedal communicates with the control module; The control module is configured to only drive the power element, the unloading valve, the first switching valve, and the second switching valve when the wireless handle and the wired foot pedal output the same operation command within a preset time; otherwise, it will trigger a system lockout and indicate a command conflict.

9. The cotton harvester control system as described in claim 6, characterized in that, The unloading valve, the first switching valve, and the second switching valve are all two-position four-way solenoid valves.

10. A cotton harvester, characterized in that, Includes the cotton harvester control system as described in any one of claims 1-9.

Images