NL8602818A - Commercial green house heating system - has warm water filled tube arrangement height-adjustably suspended above plants - Google Patents

Abstract

The heating system comprises of tube network which rests on a support grid, through which the plant stem tops protrude. Rotatable supported on the transverse beams (11,12,13,14) are two long spindles (15,16), which are driven by electromotors (17,18). Spindles are each provided with a number of winding drums (19,20,21,22,23,24) for steel cables (25). Suspended from the cables are e.g. three transverse supports, pref square tubes (1) on which a set of horizontal U-shaped tubes (7) rest. The tubes are flexible hoses which are connected to a warm water supply. Under each transverse support fits a horizontal square gauze support grid (8). Plant stem tops protrude through each square grid hole.

Description

71- BF 39 NL

* ψ Hoistable device for heating a greenhouse.

The applicant mentions as inventor:

Johannes TERLOUW in Nieuwendijk.

The invention relates to a hoistable device for heating a greenhouse for growing plants in beds, wherein, at an adjustable height above a bed, there are a set of horizontally extending hot water pipes which rest on 5 hanging transverse supports, each of which has a support for a horizontal support mesh for plants is provided. Such devices are in use in greenhouse horticulture and are known as Mhijs heating.

At the top of the greenhouse are winding drums for the steel-10 cables from which the cross supports hang. As the crop grows up, the lifting heater is hoisted accordingly by activating the take-up drums, so that the heat source is constantly near the growing tips of the plants.

The upwardly extending support mesh thereby provides support for the young plant stem at the correct height. This support mesh has square mesh, in principle there is a plant in each mesh. The gauze is stretched after application.

In a known hoisting heater, the transverse supports 20 consist in each case of a square tube, on which two or more hoisting eyes are welded and under which an equally long rod of, for example, 8 mm diameter for carrying the support mesh is welded with welded side brackets. The whole is galvanized after welding together. This known construction has the drawbacks that separate operations such as welding and galvanizing are required, and that the whole is quite heavy and spatially extensive.

^ 6 0-2 ε t e \

-2- BF 39 NL

The object of the invention is to provide an apparatus of the type indicated, wherein these drawbacks have been satisfactorily solved. For this purpose, the hoistable device according to the invention is characterized in that a heating pipe 5 is in each case detachably attached to the transverse support via a plastic clamping bracket and that the support tube consisting of pipe for the support mesh is detachably attached to the ends of the upper transverse support with two plastic sealing caps. .

This combination of features results in a light, yet sturdy and easy to disassemble construction. In particular, a tubular support for the support mesh is lighter and stiffer against deflection compared to a rod. Because no separate operations such as welding and galvanizing are required during manufacture, investment costs are saved.

According to a preferred embodiment, the tube for supporting the support mesh is fastened to the upper transverse support with an additional plastic support near the center. According to a further feature, in order to simplify keeping the parts in stock, the lifting eyes on the top of each transverse support are preferably designed identically to the said plastic support.

The sealing caps at the ends of the top cross-section designed as a square tube can either grip around the tube ends or protrude into the tube ends. In the first case, there is the advantage of a better dimensional tolerance of the outer dimensions of the transverse support, which is designed as a square tube, which can lead to a close fit between the tube and the cap. In the latter case, the advantage of a narrow dimensional tolerance of the inner dimensions is lacking and, in order to increase the grip 30, the part of the sealing cap protruding into the tube is provided with sprung combs all round.

In order to keep a hoisting heater stable during the vertical movement and, in particular, to prevent swinging (which could damage the growing crop), it is customary to provide a vertical guide rod in the greenhouse, around which a guide attached to the cross support. eye slips. According to a feature of the invention, at least one of the closing caps is provided with a hole, so that a guide eye can thus be mounted.

8602S 18 #

-3- BF 39 KL

The invention will be explained in more detail below with reference to an exemplary embodiment in the accompanying drawing.

Figure 1 schematically shows in perspective a greenhouse in which a hoisting heater is arranged;

Figure 2 shows the hoistable device in detail;

Figure 3 shows a cross-sectional lifting eye on the line III-III in Figure 2;

Figure 4 shows a clamping bracket in cross section along the line IV-IV in Figure 2;

Figure 5 shows a cross-sectional support taken on the line V-V in Figure 2;

Figure 6 shows an inner closure cap according to arrows VI-VI in Figure 2.

Figure 1 shows a hoistable device for heating in the middle of three sketchily indicated greenhouses, in the form of a so-called hoisting heater. Rotatably mounted on cross beams 11, 12, 13 and 14 at the top of the greenhouse, there are two long shafts 15 and 16. These shafts 15 and 16 can be rotated by means of electric motors 17 and 18. The shafts 15 and 16 are each provided with a number of winding drums 19, 20, 21, 22, 23 and 24 on which steel cables 25 can be wound. The hoisting heater consisting of a number, for example three, cross-shaped supports 1, which are designed as square tube 1, hangs on the steel cables 25, on which a pair of horizontally extending hot water tubes 7 rest. These pipes 7 are connected via flexible hoses to a number of main pipes for the supply and discharge of hot water, which are shown schematically in broken lines.

Under each transverse support 1 a support 2 for a horizontal support mesh 8 is arranged. This support mesh 8 has square mesh, in principle there is a plant in each mesh. In figure 1 only a few plants are indicated schematically.

In figure 1, each transverse support 1 hangs on two hoisting eyes 3, which is sufficient for normal lengths of, for example, three meters. It will be clear that with greater lengths of the supports 1, for instance of six meters, up to three lifting eyes are required to prevent undesired sagging, and the correct functioning of the lifting heating (heating near the growing tips and support at the correct height of the growing crop).

860 2 8 1 6

, -4- BF 39 NL

F

Figure 2 shows a transverse support in side view and shortened. This transverse support is suspended by means of two or more lifting eyes 3 slid around the square tube 1 from the steel cables 25.

The heating pipe 7 is detachably attached to the pipe 1 via a plastic clamping bracket 4. The carrier for the support mesh (not shown in Figure 2), which also consists of tube 2, is detachably attached to the ends of the upper tube 1 with two plastic sealing caps 6. An additional support 5 is provided near the center of the tubes 1 and 2. It has the same shape as the 10 lifting eyes 3 (compare figures 3 and 5), which makes it easier to keep stock.

As will further be apparent from Figure 2, the sealing cap 6 is inserted into the end of the tube 1 and around the end of the tube 2. To compensate for the dimensional tolerance of the inner size of the pipe 1. 15 and in order to increase the grip, the part of the sealing cap 6 projecting into the tube 1 is provided with resilient combs 9 all around. The closure cap 6 has a hole 10 for mounting a guide eye (not shown).

The hoisting heater according to the invention can be assembled quickly and easily as a kit.

25 30 35 8602818

Claims (6)

1. Hoistable device for heating a greenhouse for growing plants in beds, wherein at an adjustable height above a bed there are a set of horizontally extending hot-water pipes resting on hanging cross-supports, each of which carries a support for a horizontal support mesh for plants is provided, characterized in that each time a hot water pipe (7) is releasably attached to the cross support (1) via a plastic clamping bracket (4) and that the support for the support mesh (8) consisting of pipe (2) is attached releasably to the ends of the upper transverse support (1) with two plastic sealing caps (6). 15 Device according to claim 1, characterized in that the tube (2) for supporting the support mesh (8) is fastened to the upper transverse support (1) near the center with an additional plastic support (5). 20 Device according to claim 2, wherein each transverse support has two or more lifting eyes at the top, characterized in that the lifting eyes (3) are identical to the plastic support (5). 25 Device according to claim 1, characterized in that the detachable sealing caps (6) grip around the tube ends at the ends of the upper cross support, which are designed as a square tube (1). 30 Device according to claim 1, characterized in that the sealing caps (6) protrude into the ends of the transverse support designed as a square tube (1), the part protruding into the tube (1) being all round from resilient combs (9) to provide. 35 Device according to any one of claims 1 to 5, characterized in that at least one of the sealing caps (6) is provided with a hole (10). 8602818