Spray machine spray pole support screw rod telescopic structure and agricultural spray machine

Abstract

The utility model relates to the field of sprayer, more particularly to a kind of sprayer spray rod support screw rod telescopic structure and agricultural sprayer, comprising: chassis assembly, its upper is equipped with crossbeam;Spray rod support weld, through support beam sliding installation in the inside of the crossbeam;Screw rod assembly, including fixed on the chassis assembly fixed nut, with the fixed nut cooperation and rotatable mobile screw rod and welded in the screw rod one end screw rod nut, the screw rod nut passes through the one end of the support beam and is connected with it, to drive the spray rod support weld along the crossbeam axial telescopic movement;Limiting mechanism, between the support beam and the crossbeam, for the spray rod support weld locking in extension position and shrinkage position two set conditions. It can realize the free telescoping of sprayer spray rod support, maintain normal support function when working, and also avoid causing the whole machine size to exceed standard when transporting.

Description

Technical Field

[0001] This utility model relates to the field of sprayers, and more specifically, to a telescopic structure for a sprayer boom support screw and an agricultural sprayer. Background Technology

[0002] With the rapid development of agricultural mechanization, sprayers, as an important piece of equipment for modern agricultural plant protection operations, are constantly evolving towards larger scale, greater intelligence, and higher efficiency. To improve operational efficiency and coverage, the boom length of modern sprayers has significantly increased, with some models boasting a boom width of tens of meters. While these large booms effectively improve application efficiency in the field, they face significant challenges in non-operational situations, particularly during road transport.

[0003] Current sprayers generally employ a folding boom design, using a multi-segment hinge structure to extend and retract the boom. In field operations, the boom is fully extended and locked in the working position; during transport, it folds and retracts using hydraulic or mechanical means. However, even in the retracted state, the inherent width of a large boom can still cause the overall machine size to exceed road transport width limits (usually no more than 3 meters). This not only potentially violates traffic regulations but also poses a safety hazard of scraping road infrastructure, severely restricting the cross-regional operation capability of large sprayers.

[0004] In existing technologies, boom supports primarily serve two functions: firstly, acting as a pivotal support point for the boom's extension and retraction; and secondly, maintaining the boom's stability during operation. These supports typically employ a fixed installation structure, making it impossible to adjust their position according to transportation requirements. When the boom is retracted, the support and boom assembly form a prominent rigid structure, a key factor contributing to excessive width during transport. Therefore, there is an urgent need for a boom support solution that can adapt to different working conditions, maintaining its normal support function during operation while preventing the overall machine size from exceeding specifications during transport. Utility Model Content

[0005] The purpose of this utility model is to provide a telescopic structure for the screw of a sprayer boom support, which can realize the free extension and retraction of the sprayer boom support, maintain the normal support function during operation, and avoid the overall size of the machine exceeding the standard during transportation.

[0006] Another objective of this invention is to provide a device that allows for the free extension and retraction of the spray boom support of a sprayer, maintaining its normal support function during operation while preventing the overall machine size from exceeding the standard during transportation.

[0007] The technical solution of this utility model is implemented as follows: A telescopic structure for a sprayer boom support screw includes: The chassis assembly has a crossbeam mounted on it; The spray bar support is welded together and slidably installed inside the crossbeam via the support beam; The screw assembly includes a fixed nut fixed to the chassis assembly, a screw that cooperates with the fixed nut and is rotatable, and a screw nut welded to one end of the screw. The screw nut passes through and connects to one end of the support beam to drive the spray bar support weld to move axially and telescopically along the crossbeam. A limiting mechanism is provided between the support beam and the crossbeam to lock the spray bar support in two preset working conditions: the extended position and the retracted position.

[0008] Furthermore, the limiting mechanism includes at least two limiting holes provided on the side wall of the support beam, a handle provided on the chassis assembly, and a spring that drives the handle to elastically press into or out of the limiting holes. When the spray bar support is welded and moved to the target position, the handle automatically embeds into the corresponding limiting hole under the action of the spring to achieve positioning and locking.

[0009] Furthermore, a nylon plate is provided on the top of the inner wall of the crossbeam. The nylon plate is fixed to the inner wall of the crossbeam by a nylon pressure plate and a nut. The support beam slides in contact with the nylon plate during the expansion and contraction process.

[0010] Furthermore, the inner walls on both the front and rear sides of the crossbeam are provided with side nylon plates and pads. The side nylon plates are fixed by another set of nylon pressure plates and nuts, which are used to guide and buffer the support beam laterally.

[0011] Furthermore, the handle is provided with a through hole, in which an elastic pin, a first flat washer and a spring are assembled. The elastic pin extends out and aligns with the limiting hole. The spring applies pressure so that the elastic pin always tends to move in the direction of the support beam.

[0012] Furthermore, the outer end of the screw is secured by a second flat washer and a slotted nut, and the slotted nut is locked in place by a cotter pin to prevent loosening.

[0013] Furthermore, it also includes a maximum stroke limiting structure, which includes a limiting block disposed on the side of the support beam and a limiting bolt disposed on the crossbeam. When the spray bar support is welded and extended to its limit position, the limiting block abuts against the limiting bolt to prevent further extension.

[0014] Furthermore, the distance between the extended position and the retracted position is 350~450mm.

[0015] An agricultural sprayer includes the aforementioned sprayer boom support screw telescopic structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are: When the operator rotates the screw nut with a wrench or other tools, the screw can only rotate around its axis and cannot move axially (due to the restriction of the fixed nut). Since the spray boom support is not locked, the screw will rotate within the fixed nut while simultaneously moving linearly axially (this is the basic characteristic of helical motion). Because the screw nut at the other end of the screw is rigidly connected to the spray boom support, the linear movement of the screw directly drives the entire spray boom support to move left and right together. The overall telescopic principle is that by manually rotating the screw nut, the screw moves linearly, pushing / pulling the spray boom support along the crossbeam to achieve the telescopic function. This allows for the free extension and retraction of the sprayer's spray boom support, maintaining normal support function during operation and preventing the overall machine size from exceeding specifications during transportation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the spray boom support of the sprayer of this utility model in its retracted state; Figure 2 This is a schematic diagram of the extended state of the spray boom support of the sprayer according to this utility model; Figure 3 This is a top view of the spray boom of the sprayer of this utility model; Figure 4 This utility model Figure 3 Sectional view at point AA; Figure 5 This utility model Figure 4 Enlarged view of a section at point D; Figure 6 This utility model Figure 4 Sectional view at point BB; Figure 7 This is a side view of the spray bar support beam of this utility model; Figure 8 This is a horizontal cross-sectional view of the telescopic structure on the sprayer of this utility model; Figure 9 This utility model Figure 8 Enlarged view of a section at point C.

[0019] In the picture: 1-Chassis assembly; 2-Spray bar support assembly; 3-Spray bar support welding; 4-Nut; 5-Nylon pressure plate; 6-Nylon plate; 7-Side nylon plate; 8-Fixing nut; 9-Screw; 10-Second flat washer; 11-Slotted nut; 12-Screw nut; 13-Crossbeam; 14-Pan plate; 15-Handle; 16-Elastic pin; 17-First flat washer; 18-Spring; 19-Limiting block; 20-Limiting bolt; 21-Cotter pin; 22-Support beam. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Example 1 The purpose of this solution is to overcome the problems of existing large boom sprayers, such as excessive width and difficulty in passage due to the fixed and non-adjustable boom support during transportation. It also addresses the shortcomings of traditional manual push-pull telescopic structures, such as laborious operation, easy jamming, and unreliable positioning. This solution provides a reasonable, easy-to-operate, stable, and reliable boom support screw telescopic structure for sprayers, enabling automatic extension of the boom support during operation and rapid retraction during transportation, thus improving the adaptability and efficiency of agricultural machinery.

[0028] Please see Figures 1 to 9 This solution provides a telescopic screw structure for a spray boom support, suitable for the width adjustment needs of large self-propelled boom sprayers between transport and operation states, aiming to solve the problem that existing boom supports are difficult to achieve telescopic positioning conveniently and stably.

[0029] like Figure 1 and Figure 2 As shown, the boom support described in this solution has two working states: a retracted state (for road transport) and an extended state (for field operations). The overall width of the machine differs significantly between the two states; this structure effectively avoids the problem of restricted passage caused by excessive width.

[0030] The overall structure of this solution mainly consists of three parts: chassis assembly 1, spray bar support assembly 2, and screw assembly and limiting mechanism that connect and drive its telescopic movement.

[0031] The chassis assembly 1 includes a crossbeam 13, which is a hollow box-shaped structure with an internal sliding channel. The spray boom support weld 3 is embedded in the crossbeam 13 via a support beam 22 at its bottom and can slide axially within it. To ensure smooth sliding and reduce wear, a nylon plate 6 is fixed to the inner wall of the top of the crossbeam 13. This nylon plate 6 is fastened to the inner wall of the crossbeam 13 by a nut 4 and a nylon pressure plate 5. Because nylon material has good self-lubricating and wear-resistant properties, it can effectively reduce the frictional resistance of the support beam 22 during reciprocating movement, extending its service life.

[0032] Meanwhile, pads 14 and side nylon plates 7 are also installed on the inner walls of the front and rear sides of the crossbeam 13, and are also fixed with nuts 4 and nylon pressure plates 5. The pads 14 serve as a buffer to prevent the support beam 22 from swaying or impacting during movement; the side nylon plates 7 further provide lateral guidance support and improve the overall operational stability.

[0033] The spray boom support assembly 2 includes a spray boom support weld 3, the extension and retraction of which is driven by a screw assembly. Specifically, a fixing nut 8 is welded to one end of the chassis assembly 1, and a screw 9 passes through the fixing nut 8, forming a helical pair with it. When the screw 9 is rotated, it generates a linear reciprocating motion due to its axial constraint. A screw nut 12 is welded to the other end of the screw 9. The screw nut 12 passes through a pre-drilled circular hole at the left end of the spray boom support weld 3 and is limited by an inner shoulder. It is locked and fixed on the outer side by a second flat washer 10 and a slotted nut 11. Thus, the rotational motion of the screw 9 is converted into the overall translational motion of the spray boom support weld 3.

[0034] During operation, a regular wrench, ratchet wrench, or power tool can be used to directly apply force to the hexagonal head of the screw nut 12 for effortless and efficient adjustment. Especially in cases of long-term disuse or harsh environments causing structural jamming, the support can still be smoothly moved by applying a large torque with the help of tools, overcoming the shortcomings of traditional manual pushing and pulling that are laborious and unreliable.

[0035] To ensure reliable locking of the boom support in the two critical positions of "retraction" and "extension," this solution incorporates a mechanical elastic limiting mechanism. For example... Figures 3-7 As shown, two limiting holes are provided on the side of the support beam 22, corresponding to the retracted position and the extended position respectively. The center distance between the two holes is 350~450mm, preferably designed to be 370mm, which is the actual extension stroke required by the spray bar support.

[0036] A handle 15 is mounted on the chassis assembly 1. The handle 15 has a through hole, in which a spring pin 16, a first flat washer 17, and a spring 18 are sequentially installed. One end of the spring 18 abuts against the first flat washer 17, and the other end abuts against the base of the handle 15, so that the spring pin 16 is always subjected to pressure in the direction of the support beam 22.

[0037] When the spray boom support is in any position, if it needs to be changed, the operator only needs to lift the handle 15 upwards to disengage the elastic pin 16 from the current limiting hole and unlock it. Then, rotate the screw nut 12 to drive the entire spray boom support weld 3 to slide along the crossbeam 13. When it moves to the target position (for example, advancing 370mm to the extended position), another limiting hole on the support beam 22 is exactly aligned with the handle 15. Under the action of the spring 18, the elastic pin 16 automatically springs into the hole, making a "click" sound to indicate that it has reached the correct position and completes the positioning and locking.

[0038] Similarly, the reverse operation can be performed to return from the extended state to the contracted state.

[0039] To further ensure equipment safety and prevent excessive extension due to misoperation, this structure also includes a maximum stroke limit device. Specifically, it includes a limit block 19 welded to the side of the support beam 22 and a limit bolt 20 mounted on the crossbeam 13. When the spray boom support extends to its limit position, the limit block 19 contacts the limit bolt 20, preventing further advancement and forming a double protection.

[0040] In addition, to prevent the end of the screw 9 from loosening, the slotted nut 11 is tightened and then a cotter pin 21 is inserted for mechanical anti-loosening to ensure a firm and reliable connection.

[0041] In summary, this solution achieves smooth extension and retraction of the spray boom support through the screw 9 drive, and, in conjunction with the spring-loaded elastic handle 15 limiting mechanism, enables rapid switching and reliable locking between transportation and operational conditions. The entire structure is compact, with all moving parts housed within the crossbeam 13, resulting in a clean appearance, good protection, and adaptability to complex working conditions of agricultural machinery. It possesses high practicality and promotional value.

[0042] Example 2 An agricultural sprayer includes the aforementioned sprayer boom support screw telescopic structure.

[0043] Figure 1 and Figure 2 These refer to the two states of the boom support: extended and retracted. When the sprayer is in transport mode, the boom support is in the retracted state, and the retracted state of the boom will not cause the overall width of the sprayer to exceed the limit.

[0044] Specifically, when the sprayer is working, the boom support extends, facilitating the rapid extension and retraction of the boom. The boom support weld 3 is installed inside the crossbeam 13 of the chassis assembly 1 via the support beam 22. A nylon plate 6 is installed on the upper side of the inner wall of the crossbeam 13, and the nylon plate 6 is fixed to the crossbeam 13 by nuts 4 and nylon pressure plates 5. Pads 14 and side nylon plates 7 are installed on the front and rear sides of the crossbeam 13. The pads 14 serve as cushioning and are also fixed to the crossbeam 13 by nuts 4 and nylon pressure plates 5. The fixing nut 8 is welded to the chassis assembly 1, and the screw 9 achieves its extension and retraction movement by rotating on the nut 4. The other end of the screw 9 is welded to the screw nut 12 as a whole. During installation, the screw nut 12 passes through the pre-drilled round hole on the left end face of the spray bar support weld. The inner side is limited by the shoulder of the screw nut 12, and the outer side is fixed using the second flat washer 10 and the slotted nut 11. After the slotted nut 11 is tightened, it is fixed with the cotter pin 21. When the screw 9 rotates, it drives the spray bar support weld 3 to extend and retract. The support beam 22 has two positioning holes on its side, used to limit the extension and retraction positions. The distance between the two holes is 370mm, which is also the required extension dimension for the spray bar support assembly 2. In the retracted state, the handle 15 is in the positioning hole, serving as a limit. When extension is needed, the handle 15 is lifted. The head of the screw nut 12 has a bolt-like structure, allowing the screw nut 12 to be rotated with a wrench or ratchet wrench, moving the screw 9. After moving one round hole position, the handle 15 is released. The handle 15 has a positioning hole for installing the elastic pin 16 and the first flat washer 17 to limit the spring 18, ensuring that the handle 15 is pressed tightly against the side of the support beam 22 under the pressure of the spring 18. As the support beam 22 continues to move, it reaches the extended position when it has moved 370mm. Under the pressure of the spring 18, the handle 15 enters the limiting hole, and the support beam 22 stops moving, completing the entire extension process. Similarly, the retraction process is similar. A limiting block 19 is installed on the side of the support beam 22, and a limiting bolt 20 is installed on the crossbeam 13 of the chassis assembly 1 to limit the maximum extension position. When the maximum extension is reached, the limiting block 19 and the limiting bolt 20 contact each other, and the extension stops.

[0045] The core objective of this plan is: The solution addresses the issue of excessive width of large sprayers by allowing the boom supports of the sprayers to automatically extend during field operations and quickly retract during transport.

[0046] To achieve this goal, the structure employs a three-in-one working mechanism of "screw 9 drive + sliding guide + elastic mechanical limit": 1. Power source: Manually rotate screw 9 (or with the aid of tools); 2. Action: Drives the spray boom support to slide left and right within the crossbeam 13; 3. Position locking: After reaching the designated position, the spring-loaded handle 15 automatically engages with the limit hole to complete the locking.

[0047] The entire process requires no hydraulic system or motor, has a simple structure, low cost, and high reliability, making it particularly suitable for agricultural machinery use environments.

[0048] The transmission structure of the screw assembly is a mechanical structure that rotates the screw 9 to drive the support to translate: 1. Composition of core components: Fixing nut 8: Welded onto chassis assembly 1, its position is fixed.

[0049] Screw 9: Passes through the fixing nut 8 to form a helical pair (like a screw being screwed into nut 4).

[0050] Screw nut 12: Welded to one end of screw 9, and simultaneously connected to the spray bar support 3.

[0051] This is a typical mechanical structure that "rotates screw 9 to push the support to move".

[0052] 2. Detailed Explanation of the Work Process: When the operator rotates the screw nut 12 with a wrench, because the screw 9 can only rotate around its axis and cannot move axially (restricted by the fixing nut 8), and the spray boom support weld 3 is not locked, the screw 9 will rotate within the fixing nut 8 while moving linearly axially (this is the basic characteristic of helical motion). Since the screw nut 12 at the other end of the screw 9 is rigidly connected to the spray boom support weld 3, the linear movement of the screw 9 directly drives the entire spray boom support weld 3 to move left and right together. The overall telescopic principle is: manually rotating the screw nut 12 → driving the screw 9 to move linearly → pushing / pulling the spray boom support weld 3 to slide along the crossbeam 13 → achieving the telescopic function.

[0053] This solution designs a limiting mechanism, specifically a double-point mechanical limiting + spring 18 self-locking structure. It utilizes the elastic handle 15 + limiting hole mechanism to ensure that it can be firmly locked in both transportation and operation states. Otherwise, it would be very dangerous if it suddenly popped out during driving.

[0054] 1. Key components: The support beam 22 has two round holes on its side: one for the "retracted position" and the other for the "extended position," with a distance of 370mm between them (i.e., the required extension stroke). The handle 15 is mounted on the chassis, directly opposite these two holes. Inside the handle 15 are a spring pin 16, a spring 18, and a first flat washer 17, ensuring that the handle 15 is always subjected to downward pressure.

[0055] 2. Detailed explanation of the limit switch process: Scenario 1: From "Contraction" to "Extension" 1. Current status: The spray bar support is in the retracted position, and the handle 15 has been inserted into the "retracted limit hole" on the support beam 22 under the pressure of the spring 18, thus completing the locking.

[0056] 2. The operator lifts handle 15 upwards to disengage the elastic pin 16 from the limit hole, thereby unlocking the device.

[0057] 3. Use a wrench to rotate the screw nut 12 clockwise → the screw 9 moves forward → causing the spray bar support to slide outward.

[0058] 4. After the support beam 22 moves about 370mm, the "extension limit hole" is exactly aligned with the handle 15.

[0059] 5. At this time, release handle 15 → Under the action of spring 18, handle 15 will automatically fall → the elastic pin 16 will engage with the "extension limit hole" → completing the locking of the new position.

[0060] Scenario 2: From "Extension" back to "Contraction" 1. Lift the handle upwards by 15 to unlock; 2. Rotate screw nut 12 in the opposite direction (counterclockwise), screw 9 will retract; 3. Support beam 22 slides inward; 4. After moving 370mm, return to the original position and align the "retractable limit hole" with handle 15; 5. After releasing the handle, handle 15 will automatically spring back into the hole and lock again.

[0061] Special safety design: Even if you forget to lift handle 15, you cannot forcibly rotate screw 9 → prevents accidental operation. Screw 9 itself has self-locking properties (small thread helix angle), so it will not slip out on its own even without being stopped, providing double protection.

[0062] The role of other auxiliary structures (synergistic performance enhancement): 1. Nylon plate 6 and side nylon plate 7: Reduce metal friction, protect sliding surfaces, and make operation smoother; 2. Pad 14: Buffers vibration and impact to prevent structural loosening; 3. Limiting block 19 + limiting bolt 20: Prevents damage caused by excessive extension and provides rigid end-point protection; 4. Slotted nut 11 + cotter pin 21: Prevents the end of screw 9 from loosening and improves safety.

[0063] The overall workflow is as follows: from the initial state (retracted) → lift handle 15 to release the limit → rotate screw nut 12, screw 9 advances linearly → spray bar support slides along crossbeam 13 (nylon plate 6 reduces friction and guides) → after moving 370mm, extend the limit hole to align with handle 15 → release handle 15, spring 18 is pressed, elastic pin 16 is inserted into the hole and locked → enter the working state → reverse operation to retract.

[0064] This solution cleverly utilizes two of the most basic yet reliable principles in mechanics: 1. Screw drive → achieving effortless and controllable linear extension and retraction; 2. Elastic mechanical limit → achieving safe and reliable dual-position locking. The combination of these two principles avoids the high cost and maintenance difficulties of complex hydraulic or electronic control systems, while overcoming the laborious and unreliable problems of traditional purely manual structures. It truly achieves the design goal of "simple structure, convenient operation, safety, and durability," making it highly suitable for agricultural machinery use in rural areas of my country.

[0065] The beneficial effects of the technical solution in this plan are: 1. Effortless and efficient operation: The screw 9-speed transmission replaces the traditional manual push and pull, and can be driven by a wrench or power tool. It is especially suitable for telescopic adjustment in large-size and high-resistance working conditions, which greatly reduces labor intensity. 2. Accurate and reliable positioning: By setting limit holes and cooperating with spring 18 to load handle 15, automatic locking is achieved in both "extending" and "retracting" working conditions to prevent accidental slippage during operation and ensure transportation and operation safety. 3. Smooth and durable operation: Nylon plate 6 and pad 14 are set on the sliding contact surface, which have the functions of friction reduction, noise reduction and buffering, extending the service life of components and adapting to harsh farmland environment; 4. Compact and safe structure: The entire telescopic mechanism is built into the crossbeam 13, with a neat appearance and strong protection; the screw 9 has a self-locking feature, which can maintain a stable position without additional braking; 5. Easy maintenance and high reliability: All fasteners are equipped with anti-loosening measures (such as cotter pin 21), key moving parts are easy to lubricate and maintain, the overall failure rate is low, and it is suitable for long-term field operations.

[0066] In summary, this solution is simple in structure and highly practical, and is particularly suitable for large self-propelled boom sprayers. It can effectively solve the contradiction between the excessive width of the machine during transportation and the inconvenience of its operation, and has good prospects for widespread application.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this solution, and not to limit it. Although this solution has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this solution.

Claims

1. A telescopic structure for a spray boom support screw of a sprayer, characterized in that, include: Chassis assembly (1), on which a crossbeam (13) is provided; The spray bar support is welded (3) and slidably installed inside the crossbeam (13) via the support beam (22); The screw assembly includes a fixed nut (8) fixed on the chassis assembly (1), a screw (9) that cooperates with the fixed nut (8) and is rotatable, and a screw nut (12) welded to one end of the screw (9). The screw nut (12) passes through and is connected to one end of the support beam (22) to drive the spray bar support weld (3) to move axially along the crossbeam (13). A limiting mechanism is provided between the support beam (22) and the crossbeam (13) to lock the spray bar support welding (3) in two set working conditions: the extended position and the retracted position.

2. The telescopic structure of the sprayer boom support screw as described in claim 1, characterized in that, The limiting mechanism includes at least two limiting holes on the side wall of the support beam (22), a handle (15) on the chassis assembly (1), and a spring (18) that drives the handle (15) to elastically press into or out of the limiting hole. When the spray bar support welding (3) moves to the target position, the handle (15) automatically embeds into the corresponding limiting hole under the action of the spring (18) to achieve positioning and locking.

3. The telescopic structure of the sprayer boom support screw as described in claim 1, characterized in that, The top of the inner wall of the crossbeam (13) is provided with a nylon plate (6), which is fixed to the inner wall of the crossbeam (13) by a nylon pressure plate (5) and a nut (4). The support beam (22) slides in contact with the nylon plate (6) during the extension and contraction process.

4. The telescopic structure of the sprayer boom support screw as described in claim 3, characterized in that, The inner walls of the front and rear sides of the crossbeam (13) are provided with side nylon plates (7) and pads (14). The side nylon plates (7) are fixed by another set of nylon pressure plates (5) and nuts (4) to provide lateral guidance and buffering for the support beam (22).

5. The telescopic structure of the sprayer boom support screw as described in claim 2, characterized in that, The handle (15) is provided with a through hole, in which an elastic pin (16), a first flat washer (17) and a spring (18) are assembled. The elastic pin (16) extends out and is aligned with the limiting hole. The spring (18) applies pressure so that the elastic pin (16) always tends to move in the direction of the support beam (22).

6. The telescopic structure of the sprayer boom support screw as described in claim 1, characterized in that, The outer end of the screw (9) is fastened by a second flat washer (10) and a slotted nut (11), and the slotted nut (11) is locked and prevented from loosening by a cotter pin (21).

7. The telescopic structure of the sprayer boom support screw as described in claim 1, characterized in that, It also includes a maximum stroke limiting structure, which includes a limiting block (19) disposed on the side of the support beam (22) and a limiting bolt (20) disposed on the crossbeam (13). When the spray bar support weld (3) extends to the limit position, the limiting block (19) abuts against the limiting bolt (20) to prevent further extension.

8. The telescopic structure of the sprayer boom support screw as described in claim 1, characterized in that, The distance between the extended position and the retracted position is 370 mm.

9. An agricultural sprayer, characterized in that, Includes the telescopic structure of the sprayer boom support screw as described in any one of claims 1-8.

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