DK171593B1 - Control luminaire for operating spray nozzles in an agricultural application device - Google Patents

Description

DK 171593 B1

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a control luminaire for operating spray nozzles in a spray beam on an agricultural application device, wherein the spray beam comprises several partial widths and downwardly several 5 electromagnetic control valves arranged for connecting and disconnecting each one in connection with said valves. at least one common supply pipeline for a spray medium.

10 From DE-OS 29 25 474, it is known to connect several electromagnetic control valves to each other to form a control luminaire for operating spray nozzles in a spray beam on an agricultural application device. The control valves are adjacent to each other via lateral 15 openings, where the common supply of spray medium also occurs through these openings. The control valves forming the control luminaire are interconnected by means of a central anchor screw which is passed through all valve housings. In each valve housing is mounted a valve spindle, on which valve discs which cooperate with the valve openings between the chambers are arranged.

The axial displacement of the valve stem for opening and closing the individual chamber is effected by means of an electromagnetic control device. The control valve has an internal pressure equalization, so that the valve stem can be controlled with a very small operating force. In this way, roller membranes arranged at opposite end regions of the valve stem contribute to sealing the control valve housing externally. The roller membranes thus provide a pressure equalization with respect to the pressure of the external environment.

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The object of the invention is thus to provide a control luminaire and a control valve of the type indicated initially, which exhibit an improved structure.

This object is achieved in connection with the control luminaire in that each control valve is arranged in a separate housing, which is held on a carrier housing provided with at least one channel for the supply pipeline and which has at least one connection DK 171593 B1 2 for connection with the channel of the supply pipeline. This makes it possible to replace only a defective control valve without having to disassemble the entire control fitting. In the prior art, the central anchor screw must be loosened so that when replacing a center mounted control valve, several control valves must be removed. According to the invention, it is sufficient merely to dismantle the defective control valve and then to mount a corresponding new one and adjust it without influencing the setting of the other control valves.

The control luminaire may advantageously comprise a control valve with a valve housing having at least two chambers, with a valve spindle extending through the chambers and on which are arranged at least two mutually flush valve plates, which alternatively in two control positions cooperate with valve seats in connection openings between the chambers for formation. of a pressure chamber as well as by means of sealing the pressure chamber formed in opposite opposite end regions of the valve stem's bearing in the valve body, as means for sealing the individual pressure spaces in connection with each valve plate in the opposite end region for each of the these are provided with a counterbalance plate which cooperates with an axially resilient counterbalance seat in the opening to a counterbalance space, and which has an axial distance to the valve plate, which for a secure seal of the pressure space in each control position is slightly less than the distance between the counterbalance seat and the valve seat p the valve disk. Thereby, the adjustment plates are moved slightly in front in a setting and thus arrive at the plant shortly before the valve plate system against the balancing seat. Due to the axial compliance of the equalizing seat, the valve plate may close tightly against its associated valve seat and still maintain the density between the equalizing plate and the equalizing seat.

In addition, due to the force equalization that occurs only in the interior of the valve housing, a simple sealing of the housing against the displacements is possible, so that a slightly sealing bearing of the valve stem in the housing is sufficient.

The control valve control valve may be designed such that each equalizing plate in each control position to obtain a force equalization between the equalizing plate and the valve plate is slightly smaller than the associated valve plate. Thereby, the fluid pressure in the pressure chamber exerts a force of the same magnitude on both the valve plate and the equalizing plate.

In one embodiment of the control luminaire, it is contemplated that the support housing is composed of a number of sub-blocks corresponding to the number of associated control valves. This makes it possible for the carrier housing to be designed in different construction sizes depending on the number of sections of the spray beam.

In a further embodiment, the housing of each control valve is provided with the support housing. In yet another embodiment, retaining means are provided for retaining the position of the housing relative to the carrier housing. These measures allow simple assembly and disassembly of the control valves.

In a further embodiment, in the carrier housing adjacent to the channel for the supply pipeline, an additional channel for a return pipeline for a spraying tank is provided. In a further embodiment, a connection pipe for the control valve for a partial width is provided between the two channels in relation to these 30 vertically and through the support housing. This makes it possible to design the control valve as a 3/2-way valve, whereby even when a partial width is switched off, there is no increase in pressure in the pipeline. Furthermore, as a result of these measures, the control valve itself is not provided with visible connections, which results in an overall and aesthetically favorable overall impression for the luminaire. On the contrary, connections to the individual part widths are designed DK 171593 B1 4 on the bearing housing on its side facing control valves.

In a further embodiment of the control luminaire, the annular plate seal of the control valve has an outer and an inner ring and is fixed in the region by its outer ring. In this way, the inner ring is axially resilient and thus in cooperation with the individual equalizing plate allows the equalization of the forces produced by the fluid pressure acting on the valve stem.

Further advantages and characteristics of the invention will appear from the subclaims and from the following description of an embodiment of the invention shown in the drawing.

FIG. 1 shows a control valve with nine control valves according to an embodiment of the invention, which is provided with a flow meter and a pressure regulator,

FIG. 2 shows a section through the control fitting according to FIG. 1 and at the level of a control valve designed as a 3/2-way valve, and 25

FIG. 3 is an enlarged sectional view of the control valve of FIG. 2 and in the region of the valve stem.

The control luminaire (5,6) shown in FIG. 1 is part of an agricultural spraying device for applying pesticides, fertilizers or the like. The spray liquid used for this purpose is stored in a tank mounted on a tractor. The spray liquid is supplied by a speed-dependent pump from the tank via a pressure regulator 35 (1) and a flow meter (2) to the control luminaire (5,6). The control luminaire (5,6) has a number of electromagnetic control valves in clay (6), each of which belongs to a part width of a syringe bar. Each control valve (6) has a connection DK 171593 B1 5 (4) for connection with each part width, which in turn is provided with a certain number of spray nozzles. Via these connections (4), the spray liquid is fed to the spray nozzles in the spray bar. Each control valve (6) is individually controllable by means of an electromagnetic actuator (7) (Fig. 2), so that different part widths can be switched on and off independently of one another.

The control valves (6) are arranged on a carrier housing (5) which is composed of several sub-blocks (3). The sub-blocks (3) are similar in structure and shape. Each part block (3) is provided with a check valve (6). The part blocks (3), like the control valves (6), are arranged in a row. The sub-blocks (3) are interconnected by means of two central anchor screws (48) which project parallel to each other through their coaxial piercing (16) in each sub-block (3). On the overlying end surface of the part housing (5) is a cover which is fixed to the support housing (5) by means of an anchor screw (48).

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Extending axially through the support housing (5) is a central pumping channel (8) and a parallel return channel (9). The pump channel (8) is fed by the spray liquid coming from the pressure regulator (1). The return channel (9) communicates with the spray liquid tank and returns the unnecessary spray liquid into the tank. Each sub-block (3) of the carrier housing (5) is provided on one side with a contact surface on which a valve housing (17) of a control valve (6) is mounted. The sub-block 30 (3) has on this side a vertical opening opening (18) in the pump channel (8) and at a distance therefrom also a vertical opening opening (19) opening in the return channel (9), corresponding to corresponding connection openings for the control valve (6). Parallel to these two two connection openings (18, 19) is provided between the two channels (8,9) a through-bore (10) in the sub-block (3), which bore ends in connection (4) on the opposite valve (6). located side of the sub-block (3). This bore (10) also belongs to a corresponding outlet opening in the control housing (6) valve housing. The valve body (17) is secured to the part block (3) by means of screws not shown, which can be inserted from below parallel 5 to the bore (10). The valve body (17) of the check valve (6) is thus simply plugged or applied to the sub-block (3) and subsequently fixed by means of screws in this position.

10 The valve housing (17) has - in FIG. 2 and 3 from left to right - five interconnecting chambers (25,26,22,23,14), which are described in more detail below. These chambers are penetrated by a valve spindle (20) which protrudes on both sides of the valve housing and in the valve housing (17) is slidably movable in axial direction. In the left-hand side of the drawing, the valve stem (20) communicates with an electromagnetic actuator (7) which causes the axial displacement of the valve stem (20). On the opposite side, a control lever (21) is provided on the valve stem (20), which allows a manual adjustment of the valve stem (20). Two valve plates (36,37) and two equalizing plates (35,49) are also arranged on the valve stem (20), which are also described in the following. The chamber (22) is connected in the direction of the arrow (P), indicating the pumping direction of the spray liquid, to the connection opening (18).

The chamber (22) communicates via a valve opening (32) in connection with the outlet chamber (23), which opens into the bore (10) for the individual part width. The circular opening (32) forms a valve seat for the valve plate (37) in conjunction with an elastic seal attached thereto. On the side of the chamber (22) opposite the outlet chamber (23) is located a return chamber (26) which is connected to the chamber (22) through an opening (29). The opening (29) has an elastic seal (30) which forms the valve seat of the valve plate 35 (36). The valve seats thus formed (29,30) and (31,32), respectively, are arranged opposite to each other. The valve plate (36) and (37), respectively, are opposite to these valve seats.

DK 171593 B1 7

Thus, according to the control position of the valve spindle (20), two pressure chambers are formed, where one chamber (chamber (22) and return chamber (26)) serves to return the spray liquid to the return line (19), and the other (chamber (22) and outlet chamber). (23)) serves to supply spray liquid to a partial width.

Both valve discs (36) and (37) are mounted with some movement on the valve stem (20) so as to be able to adapt to the valve seat so as to ensure a tight installation. This will offset the manufacturing tolerances. The "oscillating" arrangement of the valve discs (36) and (37) is achieved by means of a spring sleeve consisting of two sleeve parts (39) and a between them compressed springs (38), which spring sleeve is arranged between the two valve discs (3). 6) and (37). Each valve plate (36) and (37) is offset at its side opposite the spring sleeve (38, 39) by means of an O-ring arranged on the valve stem (20), which is held in a flange-shaped extension (41). This 20 flange-shaped extension (41) and (40), respectively, are part of the equalizing plate (35) and (49), respectively. Each valve plate (36, 37) is thereby held between the associated socket member (39) with the O-ring and the O-ring retained in the flange-shaped extension (40, 41), being axially movable in a certain order of magnitude. ensure a tight system for the valve plate (36,37) in a closed condition. The two openings (29) and (32) as well as the two associated plate seals (30) and (31) are each equally large.

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The return chamber (26) connected to the left side of the chamber (22) extends upwardly into a return channel (11), initially initially upright. The vertically raised portion of the channel ends in a blind bore which is selected solely for manufacturing reasons and otherwise has no function. The return channel (11) is branched vertically before the blind bore (in Fig. 2 on the right side) and passes at the above end of the valve housing (17) DK 171593 B1 8 into a clearance (14). This clearance (14) is finally connected by a venturi nozzle (47) to the return channel (9) via the connection opening (19). For dispensing the reflux flow of the spray liquid, a dosing device (12, 13) is provided in the clearance (14) at the transition to the reflux duct (11), the dosing device comprising an adjusting piston (12) and a threaded adjusting member (13). The adjustment piston (12) provided with a conical body is axially displaceable 10 parallel to the valve stem (20) flush with the return channel (11), so that the distance from the main part to the return pipe outlet determines the flow through the return channel (9). This setting is done by installing the control valve (6). Thus, the reflux flow of spray liquid, which is directed to the reflux duct (9) corresponds, as far as possible, to a partial width pumped flow through the bore (10), so as to avoid pressure fluctuations in the total conduction system by switching off a control valve (6), 20 d. of a partial width.

The control system for the control valve (6) has an internal force equalization so as to keep the operating forces for the axial displacement of the valve spindle (20) as small as possible. Thereby, a displacement of the valve stem (20) is also possible with a relatively weak electromagnet in the electromagnetic control device (7). This is particularly advantageous in the present case, since the electromagnetic control device (7) is supplied from a battery, especially from the battery on the tractor. Since in the present system - as will be explained in more detail below - no pressure-relieving seal of the valve housing (17) against the environment is required, it is sufficient to seal the valve stem (20) by means of elastic O-rings 35 (44, 45) in the area at the housing wall of the valve body (17). In addition, to improve the sliding capability of the valve spindle (20) in the valve body (17), a non-shown teflon ring 17 is shown between each O-ring (44,45) and the relevant part of the valve spindle.

On the opposite side, a return spring (42) is arranged in a clearance (14) which is supported in the direction towards the housing wall 5 on a support disk (43) and is supported on the other end by a flange fixed to the valve stem (20). This return spring (42) creates a force against the electromagnet which, as a result, to displace the valve stem (20) to the right, substantially only overcomes the force of the return spring (42). To form a force equalization when adjusting the valve spindle (20), at the opposite side of the chamber (22), a compensating chamber (25) is formed which is arranged in a relief tube (15) via a relief pipe (15). bond with the free space (14). The clearance (14) serves analogously to the equalization chamber (25) in the opposite end region of the valve spindle (20) as the equalization chamber. The opening between the return chamber (26) and the compensating chamber (25) is closable by a counterbalance plate (35) which cooperates with a plate seal (28). Similarly, the opening between the chamber (23) and the free space (14) is closable by means of a counterbalance plate (49) cooperating with a plate seal (33). Thereby, the equalizing plate (35) affects the plate seal (28) in the same direction as the valve plate (37) affects the valve seat (31,32).

By analogy, the equalizing plate (49) is fixed facing the valve plate (36) on the valve stem (20). The equalizing plate (49) affects the plate seal (33) in the same direction as the valve plate (36) 30 affects the valve seat (29.30). For both settings, the control valve (6) - i.e. by connecting or disconnecting the associated part width - to be able to achieve. a safe seal of the pressure chamber formed in each case, both plate seals (28) and (33) 35 respectively are elastically clamped resiliently in the axial direction. Thereby, the plate seal (28), like the plate seal (33), has an outer ring and a recessed inner ring and consists of an elastic material. Both plate seals (28 and 33) are clamped only in the region of their outer ring, so that the respective inner ring is substantially resilient. For supporting the inner ring, each aperture (27) or (34) has a tapered tapered support ring.

5 Also, the inner surface of this support ring is tapered conically in the direction of the plate seal (28) or (33). Thereby, however, the narrowest diameter of the support ring for the two openings (27) and (34) is slightly larger than the outer diameter of the equalizing plate (35) or (49). Both equalization plate (35,49) and both openings (27) and (34) and both plate seals (28) and (33) are respectively of the same size. However, the inner diameter of the inner ring of the plate seal (28) and (33), respectively, is smaller than the outer diameter of the equalizing plate (35) and (49), respectively.

The equalizing plate (35) and the equalizing plate (49) each have an annular rim extending in the direction of the plate seal (28) and (33) respectively, which abut the respective seat surface of the plate seal (28) and (33) respectively. Between the equalizing plate (35) and (49), respectively, and the corresponding opening (27) and (34), respectively, a ring gap (46) is dimensioned such that the pressure in the outlet chamber (23) and the bore (10) to the partial width at the setting of the valve away from the spray position is momentarily reducible 25 towards the clearance (14). The size of the ring gap (46) is certainly imperial. The same applies to the tapered inner surfaces of the aperture ring (27,34).

The embodiments described above serve to close the pressure chamber formed according to the adjustment of the valve stem (20). Each equalizing plate (35, 49) is disposed in the open position at a distance from the respective plate seal (28) and (33), respectively, forming the equalizing seat, which distance is slightly less than the distance between the corresponding valve plate (37) and ( 36) and the respective associated valve seat (31,32) or 29.30). By adjusting the control valve (6), the discharge plate (35) and (49) thus advance a little distance and thus abut against the respective plate seal (28,33) before the installation of the respective valve plate (36,37). . The inner rings of the plate seals (28,33) yield in the axial direction until the valve counters (36) and (37), respectively, have come to a fixed abutment against the respective plate seals (30) and (31). As a result of the pressure of the spray liquid in each of the formed pressure compartments (22,30) and (22,26), respectively, the plate seal (33) and (28) respectively the inner ring is pressed against the equalizing plate (49) and (35) respectively. The equalizing discs (35,49) are slightly smaller than the valve number of the discs (36,27) and even so much that the pressure of the spray liquid in each of the formed pressure spaces affects the respective valve plate (36,37) and the corresponding compensating plate ( 35.49) with the same force. This power equalization provides easy operation of the valve spindle (20).

20 In the embodiment of FIG. 2 and 3, the control valve (6) is in a spray position. Thereby, the spray liquid is pumped from the pump line (8) through the connection opening (18) into the chamber (22) and thence via the spray chamber (22) into the bore (10). From there, the liquid is fed via the connection (4) to the associated spray nozzles on a partial width.

If this part width is to be disconnected, the valve stem (20) is displaced by the electromagnetic control device (7) to the right, thereby closing the opening (32) and simultaneously opening the opening (29) of the return chamber (26). Thereby, the same amount of spray liquid is fed via the return passage (11) into the free space (14) and via the venturi nozzle (47) into the return passage (9). Since the force equalization described above in the control valve (6) takes place in both settings, the operation of the valve spindle (20) is very easy to operate.

Claims (6)

A control luminaire for operating spray nozzles in a spray beam on an agricultural application device, wherein the spray beam comprises several part widths, and with multiple flushing on an axis, electromagnetic control valves for connecting and disconnecting each part width, which valves are connected to it. at least one common supply pipeline for a spray medium, characterized in that each check valve (6) is arranged in a separate housing (17) which is secured to a carrier housing (5) provided with at least one channel (8) for the supply pipeline and having at least one connection (18) for connection to the supply pipeline channel (8). 15 Control luminaire according to claim 1, characterized in that the carrier housing (5) is composed of a number of sub-blocks (3) corresponding to the number of associated control valves (6). 20 Control luminaire according to claim 1 or 2, characterized in that the housing (17) for each control valve (6) is mounted on the carrier housing (5). Control fixture according to claim 3, characterized in that retaining means are provided for fixing the position of the housing (17) on the support housing (5). A control luminaire according to claim 1, characterized in that in the carrier housing (5) adjacent to the channel (8) for the supply pipeline, an additional channel (9) is provided for a return pipeline for a spray tank. Control fixture according to claim 5, characterized in that in the carrier housing (5) between the two ducts (8,9) a vertical protruding connection line (10) of the control valve (6) is provided for a part width of the spray beam.