Agricultural implement

1. A plough implement comprising a main frame and a plurality of first ground engaging tools, wherein the plough implement is a reversible plough, the main frame supports the plurality of first ground engaging tools, and the plough implement comprises a depth adjustment apparatus configured to move at least a first ground engaging tool of the plurality of first ground engaging tools with respect to the main frame to enable adjustment of a working depth of the first ground engaging tool;

wherein the depth adjustment apparatus comprises a four-link parallelogram linkage connecting the main frame to the first ground engaging tool, the four-link parallelogram linkage comprises a first pivotable link, a second pivotable link, and a coupler link, the first ground engaging tool is coupled to the coupler link, the first pivotable link is pivotally coupled to the main frame via a first pivot and to the coupler link via a second pivot, the second pivotable link is pivotally coupled to the main frame via a third pivot and to the coupler link via a fourth pivot, and the first pivot and the third pivot are offset from one another along a longitudinal axis of the main frame; and

wherein a first length of the first pivotable link is equal to a second length of the second pivotable link, and a first distance between the first pivot and the third pivot is equal to a second distance between the second pivot and the fourth pivot to enable the depth adjustment apparatus to maintain an orientation of the first ground engaging tool with respect to a ground surface while moving the first ground engaging tool relative to the main frame.

2. The plough implement of claim 1 , wherein the depth adjustment apparatus comprises an actuator configured to drive the depth adjustment apparatus.

3. The plough implement of claim 1 , wherein the plough implement comprises a control unit for controlling the depth adjustment apparatus, and the control unit is configured to decrease the working depth of the first ground engaging tool of the plurality of first ground engaging tools if an obstacle collision is encountered and/or predicted.

4. The plough implement of claim 3 , comprising an obstacle sensor configured to identify obstacles, the obstacle sensor being arranged in front of the first ground engaging tool in a direction of travel.

5. The plough implement of claim 1 , wherein a second ground engaging tool of the plurality of first ground engaging tools is coupled to the coupler link, and the depth adjustment apparatus is configured to move the first and second ground engaging tools of the plurality of first ground engaging tools with respect to the main frame such that movement of the first and second ground engaging tools is synchronized.

6. The plough implement of claim 1 , wherein the plough implement comprises a second depth adjustment apparatus configured to move a second ground engaging tool of the plurality of first ground engaging tools with respect to the main frame, and the first and second depth adjustment apparatus are configured to move the first and second ground engaging tools independently of each other.

7. The plough implement of claim 1 , wherein the main frame supports a plurality of second ground engaging tools and is transferable between a first configuration, in which the plurality of first ground engaging tools is in a respective working position, and a second configuration, in which the plurality of second ground engaging tools is in a respective working position, and the plough implement comprises a second depth adjustment apparatus configured to move a first ground engaging tool of the plurality of second ground engaging tools with respect to the main frame to enable adjustment of a working depth of the first ground engaging tool of the plurality of second ground engaging tools.

8. The plough implement of claim 7 , wherein the first ground engaging tool of the plurality of first ground engaging tools is moveable independently of the first ground engaging tool of the second plurality of ground engaging tools.

9. The plough implement of claim 1 , wherein the depth adjustment mechanism is configured to move the first ground engaging tool between a first position, in which a minimum working depth is set, and a second position, in which a maximum working depth is set; and

wherein the plough implement comprises a first stop configured to lock the first ground engaging tool in the first position, the plough implement comprises a second stop configured to lock the first ground engaging tool in the second position, or a combination thereof.

10. The plough implement of claim 1 , wherein the first ground engaging tool is a plough body.

11. Agricultural machinery comprising an agricultural vehicle and the plough implement of claim 1 , wherein the plough implement is connected to a front or a rear of the agricultural vehicle.

12. A plough implement comprising a main frame and a plurality of ground engaging tools, wherein the main frame supports the plurality of ground engaging tools, and the plough implement comprises a depth adjustment apparatus configured to move a first ground engaging tool of the plurality of ground engaging tools with respect to the main frame to enable adjustment of a working depth of the first ground engaging tool;

wherein the depth adjustment apparatus comprises a pivotable link, a first actuator and a second actuator, the pivotable link is pivotally coupled to the main frame via a first pivot and to the first ground engaging tool via a second pivot, the first actuator is configured to drive the pivotable link to rotate to adjust the working depth of the first ground engaging tool, and the second actuator is configured to drive the first ground engaging tool to rotate relative to the pivotable link to adjust an orientation of the first ground engaging tool relative to a ground surface.

13. The plough implement of claim 12 , wherein the plough implement comprises a control unit for controlling the depth adjustment apparatus, wherein the control unit is configured to automatically synchronize actuation of the first and second actuators to maintain the first ground engaging tool at a target orientation relative to the ground surface while the working depth is adjusted.

14. The plough implement of claim 12 , wherein the first actuator is pivotally coupled to the main frame and to the pivotable link, and the second actuator is pivotally coupled to the pivotable link and to the first ground engaging tool.

15. The plough implement of claim 12 , wherein the plough implement is a reversible plough.

16. The plough implement of claim 12 , wherein the first ground engaging tool is a plough body.