High-precision angle control device for truss

Abstract

The utility model relates to a high-precision angle control device for a truss. The structure comprises a main water feeding pipe on a central tower crane, and the main water feeding pipe is connected with a rotary elbow and a truss. The rotary elbow is fixed on the upper supporting plate, the lower supporting plate is fixed on the central tower support, and the rotary support is arranged between the upper supporting plate and the lower supporting plate; the multi-position switch box is fixed on the box support, the box support is fixed on the lower supporting plate, the multi-position switch box is connected with the electric control box, and a multi-position switch left collision block plate, a multi-position switch right collision block plate, a left pointer, a right pointer and a background plate are further arranged. Compared with the prior art, the truss high-precision angle control device has the advantages that the structure is simple, the installation is convenient, the equipment operation synchronism is excellent, the equipment parallel linearity is small, the equipment operation is stable, the control precision is high, the irrigation uniformity is better, and the like.

Description

Technical Field

[0001] This utility model relates to farmland irrigation equipment, and in particular to a high-precision angle control device for trusses. Background Technology

[0002] Currently, large-scale horizontal irrigation equipment consists of a central tower trolley and a multi-stage sprinkler truss. The central tower trolley and the truss are connected by a rotating elbow at the top of the central tower trolley's main water supply pipe. Both the central tower trolley and the truss are equipped with independent travel motors. The parallel linearity of the equipment's operation—the angle between the truss's advance or lag and the horizontal centerline of the central tower trolley—is crucial for ensuring irrigation effectiveness. Many existing manufacturers use time relays, or timers, housed in an electrical control box located on the central tower trolley. The timer controls the travel motors on both the central tower trolley and the truss, which in turn control the tires connected to those motors. The timer can send synchronization signals, thus adjusting the parallel linearity between the equipment and the truss by controlling the truss's travel time. Because there is no truss position detection mechanism and no truss feedback signal, this method is an open-loop control method. Such equipment suffers from drawbacks such as: the timer can only send synchronization control signals, resulting in low control accuracy; and the linearity of the translation deteriorates due to equipment slippage or changes in load performance, leading to unstable equipment operation. Summary of the Invention

[0003] The technical objective of this utility model is to address the shortcomings of the above-mentioned existing system by providing a high-precision angle control device for trusses with high control accuracy.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: The high-precision angle control device for trusses of this utility model includes a rotating elbow connected to the main water supply pipe on the central tower trolley, the rotating elbow being connected to the main pipeline of the truss, and the central tower support being installed on the central tower trolley. The rotating elbow passes through the central hole of the upper support plate and is fixed to the upper support plate by a fixing clamp. The lower support plate is fixed to the central tower support with bolts, and a slewing support is installed between the upper and lower support plates. A multi-position switch box is fixed to a box bracket, the box bracket is fixed to the lower support plate, the multi-position switch box is connected to an electrical control box, and the electrical control box is installed on the central tower support. The left impact plate of the multi-position switch is fixed to the left plate bracket, the left plate bracket is fixed to the upper support plate, the right impact plate of the multi-position switch is fixed to the right plate bracket, and the right plate bracket is fixed to the upper support plate.

[0005] The left plate bracket is connected to the left pointer, the right plate bracket is connected to the right pointer, and the box bracket is connected to the background plate.

[0006] Compared with existing technologies, the high-precision angle control device for trusses of this utility model has the following characteristics: By setting up a multi-position switch box, this utility model provides a detection device for the truss's running position, overcoming the shortcomings of inaccurate control in existing technologies. This results in better synchronization of equipment operation, lower parallel linearity, more stable equipment operation, and higher control precision. By setting up a multi-position switch right-side impact plate, the function of the angle control device is expanded, which can meet the needs of adjusting the parallel linearity of the truss at different work positions. It is convenient to use, saves costs, and increases economic benefits. Attached Figure Description

[0007] The present invention will be further described below with reference to the accompanying drawings.

[0008] Appendix Figure 1 This is a schematic diagram of the structure of a high-precision angle control device for trusses in use.

[0009] Appendix Figure 2 This is a schematic diagram of the structure of a high-precision angle control device for trusses in use.

[0010] Appendix Figure 3 This is a three-dimensional structural diagram of the truss high-precision angle control device.

[0011] Appendix Figure 4 This is a three-dimensional structural diagram of the truss high-precision angle control device.

[0012] Appendix Figure 5 This is a schematic diagram of the multi-position switch box structure of the truss high-precision angle control device.

[0013] Appendix Figure 6 This is a schematic diagram of the left impact plate section of the multi-position switch of the truss high-precision angle control device.

[0014] Appendix Figure 7 This is a schematic diagram of the right impact plate section of the multi-position switch of the high-precision angle control device for the truss.

[0015] In the diagram: 1. Central tower crane, 2. Main water supply pipe, 3. Rotary elbow, 4. Truss, 5. Central tower support, 6. Fixing clamp, 7. Upper support plate, 8. Slewing support, 9. Lower support plate, 10. Multi-position switch box, 11. Box bracket, 12. Left impact plate of multi-position switch, 13. Left plate bracket, 14. Right pointer, 15. Background plate, 16. Electrical control box, 17. Right impact plate of multi-position switch, 18. Right plate bracket, 19. Left pointer. Detailed Implementation

[0016] The high-precision angle control device for the truss is described in detail below with reference to the accompanying drawings.

[0017] This utility model discloses a high-precision angle control device for trusses. The structure includes a main water supply pipe 2 connected to a rotating elbow 3 on a central tower trolley 1. The rotating elbow 3 is connected to the main pipeline of the truss 4. A central tower support 5 is mounted on the central tower trolley 1. The rotating elbow 3 passes through the central hole of an upper support plate 7 and is fixed to the upper support plate 7 by a fixing clamp 6. During operation, the rotating elbow 3 can rotate around the central tower support 5, and the upper support plate 7 can rotate with the elbow 3. A lower support plate 9 is bolted to the central tower support 5 and remains stationary during operation. A slewing support 8 is installed between the upper support plate 7 and the lower support plate 9, allowing relative rotation between them. A multi-position switch box 10 is fixed to a box bracket 11, which in turn is fixed to the lower support plate 9 and remains stationary. The multi-position switch box 10 is connected to an electrical control box 16, which is mounted on the central tower support 5. The left impact plate 12 of the multi-position switch is fixed to the left plate bracket 13, which is fixed to the upper support plate 7. The right impact plate 17 of the multi-position switch is fixed to the right plate bracket 18, which is fixed to the upper support plate 7. During operation, the left and right impact plates of the multi-position switches can rotate slightly together with the upper support plate 7. When the left or right impact plate 17 of the multi-position switch and the multi-position switch box 10 form a relative displacement, the angular displacement can be converted into an electrical signal to trigger different switches on the multi-position switch box 10, which can be used to adjust the translational position of the central tower crane and the span. When the truss 4 is working on the left side of the central tower crane 1, the left impact plate 12 and the multi-position switch box 10 work together. When the truss 4 is moved to the right side of the central tower crane 1 for irrigation purposes, the right impact plate 17 and the multi-position switch box 10 work together. In this way, the right-side impact block 17 of the multi-position switch can realize the extended functions of the application and meet the needs of adjusting parallel linearity in different working conditions.

[0018] The number of the multi-position switch box 10 is 1, and the multi-position switch box 10 is equipped with 5 switches:

[0019] The first switch 101 is a forward detection switch;

[0020] The second switch 102 is a hysteresis detection switch;

[0021] The third switch 103 is a non-lagging and non-leading detection switch;

[0022] The fourth switch, 104, is an over-limit detection switch;

[0023] The fifth switch, 105, is a zone detection switch;

[0024] The multi-position left switch stop plate 12 is provided with four sets of stop blocks:

[0025] The leftmost collision block 121 is a detection block with a parallel linearity leading by 0.4°.

[0026] The second impact block on the left, 122, is a parallel linearity detection block with a hysteresis of 0.4°.

[0027] The left third collision block 123 is a parallel linearity detection block that does not lag or lead.

[0028] The left fourth collision block 124 is a parallel linearity swing angle limiting detection block.

[0029] The multi-position right switch stop plate 17 is equipped with five sets of stop blocks:

[0030] The rightmost collision block 171 is a detection block with a parallel linearity leading by 0.4°.

[0031] The second collision block on the right, 172, is a parallel linearity detection block with a hysteresis of 0.4°.

[0032] The third collision block on the right, number 173, is a parallel linearity detection block that neither lags nor leads.

[0033] The right fourth impact block 174 is a parallel linearity swing angle limiting detection block.

[0034] The position of the right fifth impact block 175 is set on the center line of the right fourth impact block 174. The right fifth impact block 175 can complete the area irrigation positioning function when the truss 4 needs to switch from running on the left to running on the right due to work requirements.

[0035] The multi-position switch box 10 can detect the truss's operating position and provide feedback signals. This control system is a closed-loop control system. This results in better synchronization of equipment operation, lower parallel linearity, more stable equipment operation, and higher control precision.

[0036] The left plate bracket 13 is connected to the left pointer 19, the right plate bracket 18 is connected to the right pointer 14, and the box bracket 11 is connected to the background plate 15. The background plate 15 is marked with colored lines to indicate the angle between the truss and the horizontal centerline of the central tower trolley during equipment operation. This allows for a clear and intuitive observation of the range of parallel linearity of the equipment's operation by observing where the left pointer 19 or the right pointer 14 points.

[0037] In operation, the rotating elbow 3 drives the fixing clamp 6 to rotate, the fixing clamp 6 drives the upper support plate 7 to rotate, and the upper support plate 7 drives the left impact block 12 and the right impact block 17 of the multi-position switch to rotate; thereby achieving angular displacement with the multi-position switch box 10 fixed on the lower support plate 9, triggering the switch button on the multi-position switch box 10 to work, and achieving precise angle control.

[0038] This invention enables the truss to move ahead or behind at a small angle to the horizontal centerline of the central tower trolley, resulting in good synchronous forward or backward movement of the equipment. The radial forces between the trusses are small, extending the equipment's service life. Furthermore, by minimizing parallel linearity and sway, the invention ensures uniform parallel movement, guaranteeing consistent irrigation. This invention can control the parallel linearity within ±0.6° for most of the equipment's operation, making it particularly suitable for angle control of large translation machines and improving irrigation efficiency.

Claims

1. A high-precision angle control device for a truss, comprising a main water supply pipe (2) on a central tower trolley (1) connected to a rotating elbow (3), the rotating elbow (3) connected to a main pipeline of the truss (4), and a central tower support (5) mounted on the central tower trolley (1), characterized in that... The rotating elbow (3) passes through the center hole of the upper support plate (7) and is fixed to the upper support plate (7) by the fixing clamp (6). The lower support plate (9) is fixed to the central tower support (5) with bolts. A slewing support (8) is installed between the upper support plate (7) and the lower support plate (9). The multi-position switch box (10) is fixed on the box bracket (11), and the box bracket (11) is fixed on the lower support plate (9). The multi-position switch box (10) is connected to the electrical control box (16), and the electrical control box (16) is set on the central tower support (5). The left impact plate (12) of the multi-position switch is fixed on the left plate bracket (13), and the left plate bracket (13) is fixed on the upper support plate (7). The right impact plate (17) of the multi-position switch is fixed on the right plate bracket (18), and the right plate bracket (18) is fixed on the upper support plate (7).

2. The high-precision angle control device for trusses according to claim 1, characterized in that: The left plate bracket (13) is connected to the left pointer (19), the right plate bracket (18) is connected to the right pointer (14), and the box bracket (11) is connected to the background plate (15).

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