CN109105065B

CN109105065B - Agricultural is with seedling breeding device of being convenient for transplant seedling plant

Info

Publication number: CN109105065B
Application number: CN201811036571.5A
Authority: CN
Inventors: 何宏昌; 初丽萍; 苏波
Original assignee: Jilin Kaiyi Agriculture And Animal Husbandry Development Co ltd
Current assignee: Jilin Kaiyi agriculture and animal husbandry development Co.,Ltd.
Priority date: 2018-09-06
Filing date: 2018-09-06
Publication date: 2020-10-09
Anticipated expiration: 2038-09-06
Also published as: CN109105065A

Abstract

The invention relates to the technical field of agricultural planting, in particular to a seedling cultivation device convenient for transplanting seedling plants for agriculture, which comprises a shell, wherein cover doors are connected to two sides of the shell through hinges, a partition plate is vertically arranged on the upper surface of a recovery water tank, the lower ends of first sponge strips extend into the recovery water tank, water inlet holes are formed in one side of a U-shaped frame, filter plates are arranged in the lower incubator and the upper incubator, second sponge strips are arranged on the lower surfaces of the lower incubator and the upper incubator, a plurality of first rotating shafts are arranged in the middle of the inner sides of the lower incubator and the upper incubator, a plurality of cams are fixedly arranged on the outer sides of the first rotating shafts, and sliding blocks are arranged in the sliding grooves. The seedling transplanter is simple in structure, convenient to use, capable of greatly reducing labor force, capable of well cultivating seedlings, convenient to transplant seedlings, capable of greatly improving the survival rate of transplanting seedlings, and worthy of popularization and application.

Description

Agricultural is with seedling breeding device of being convenient for transplant seedling plant

Technical Field

The invention relates to the technical field of agricultural planting, in particular to a seedling cultivation device convenient for transplanting seedling plants for agriculture.

Background

In agriculture, many plants such as watermelon, cotton and the like are difficult to survive in field planting, but can grow rapidly in a nursery room, and seedling cultivation is a seedling cultivation method which means that seedlings are cultivated in a nursery, a hotbed or a greenhouse and are ready to be transplanted into soil for planting. It can also refer to the stage of various organisms after artificial protection until they can survive independently. The seedling culture is a work with high labor intensity, time consumption and strong technical performance. In the past, most of the traditional open field direct seeding mode or the cold border, improved cold border and sunlight greenhouse seedling raising mode is adopted. Due to the influence of simple and crude equipment and natural conditions, the seedlings of the seedlings are long, poor in quality, irregular in size and high in cost, and the seedlings are often lack of seedlings due to natural disasters such as freezing injury or plant diseases and insect pests. Moreover, the traditional seedling raising technology is only based on experience, the technical errors are more, and especially the seedling raising is difficult to master and popularize only based on experience. Some present seedling culture devices have some weak points, the watering difficulty, it lacks water and receives the injury to make the seedling easily, do not have the function of strengthening photosynthesis, it is inefficient to cultivate the seedling, a large amount of manpowers have been wasted, to a great extent the survival rate of seedling has been reduced, unnecessary loss has been increased, the efficiency of growing seedlings has been reduced, and current seedling culture device is when transplanting the seedling, it is convenient inadequately, make the seedling receive the injury in transplanting easily, the survival rate that reduces transplanting of seedlings, for this reason, we propose an agricultural seedling culture device who is convenient for transplant the seedling plant.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a seedling cultivation device which is convenient for transplanting seedling plants in agriculture.

In order to achieve the purpose, the invention adopts the following technical scheme:

the seedling cultivation device comprises a shell, wherein two sides of the shell are respectively connected with a cover door through hinges, a recovery water tank is arranged in the middle of the lower surface of the inner side of the shell, a partition plate is vertically arranged on the upper surface of the recovery water tank, the upper end of the partition plate is fixedly connected with the shell, rectangular holes are formed in two sides of the partition plate, a first sponge strip is arranged in the partition plate and penetrates through the rectangular holes, the lower end of the first sponge strip extends into the recovery water tank, through holes are symmetrically formed in one side of the partition plate, fluorescent lamps are arranged on the upper portions of two sides of the partition plate, lower cultivation boxes are fixedly arranged on two sides of the lower surface of the inner side of the shell, and a second rotating rod, a middle rod and a first rotating rod are respectively connected with the middle portion and the lower portion of the upper portion of one side of each lower cultivation box in, one side of the second rotating rod and one side of the first rotating rod are jointly connected with a plurality of upper incubators through pin shafts, one side of the second rotating rod and one side of the first rotating rod, which are far away from the upper incubators, are jointly connected with a transverse rod corresponding to the upper incubators through pin shafts, the middle part of the transverse rod is rotationally connected with a middle rod through pin shafts, the lower part of one side of the shell is fixedly provided with a second shell, the inside of the second shell is symmetrically provided with a motor and a worm gear reducer, the output end of the motor is fixedly connected with the input end of the worm gear reducer, the lower end of the middle rod is fixedly connected with a second rotating shaft, one end of the second rotating shaft penetrates through the shell and the second shell to be fixedly connected with the output end of the worm gear reducer, both sides of the inner upper surface of the shell and the lower surface of the upper incubators, the lower surface of the U-shaped frame is uniformly provided with a plurality of spray heads, the interiors of the lower incubator and the upper incubator are respectively provided with a filter plate, the inner lower surfaces of the lower incubator and the upper incubator are respectively provided with a second sponge strip, one end of the second sponge strip positioned in the upper incubator penetrates through the upper incubator to be abutted against the first sponge strip, the lower part of one side of the lower incubator and the lower incubator is respectively provided with a drain hole, the drain holes are connected with a recovery water tank through water pipes, the middle parts of the inner sides of the lower incubator and the upper incubator are respectively provided with a plurality of first rotating shafts, one end of each first rotating shaft penetrates through the lower incubator and the upper incubator, the outer sides of the first rotating shafts are respectively and fixedly provided with a plurality of cams, the upper parts of the two inner sides of the lower incubator and the upper incubator are respectively provided with a plurality of sliding chutes corresponding to the first rotating shafts, and the sliding blocks are respectively arranged in, a movable plate is fixedly installed between two corresponding sliders, a plurality of through holes are formed in one side of the movable plate, a shielding case matched with an upper incubator is installed on the upper surface of the movable plate, a temperature sensor, a humidity sensor and a carbon dioxide concentration sensor are installed on the upper surface of the inside of the shell, a first shell is fixedly installed at the upper end of the shell, a storage battery, a carbon dioxide storage device, a water pump, a water tank, a PLC (programmable logic controller) and an air conditioner are installed inside the first shell, an air outlet pipe is installed at the air outlet of the carbon dioxide storage device, one end of the air outlet pipe penetrates through the shell, an electromagnetic valve is installed on a pipeline of the air outlet pipe, the water inlet of the water pump is connected with the water tank, the water outlet of the water pump is connected with a water outlet, the storage battery, the electromagnetic valve, the water pump, the PLC, the air conditioner, the temperature sensor, the humidity sensor, the carbon dioxide concentration sensor and the motor are connected through leads.

Preferably, the middle of the cover door and the front and the back of the shell are both provided with light holes, and transparent glass is mounted inside the light holes.

Preferably, the edges of the cover door are all provided with rubber gaskets.

Preferably, the two sides of the lower surface of the shell are symmetrically provided with movable wheels which can be self-locked.

Preferably, one side of the isolation cover is provided with a plurality of square holes, and each row of square holes corresponds to the moving plate.

Preferably, one side of the first shell is connected with a box door through a hinge, and one side of the box door is provided with a buckle.

Preferably, the upper end of the middle rod is fixedly provided with a supporting leg, and the supporting leg is a supporting leg with adjustable length.

The seedling cultivation device for agriculture convenient transplanting of seedling plants provided by the invention has the beneficial effects that: the last incubator that this invention was equipped with can expand when the intermediate lever rotates, makes neatly distribute between each last incubator to can conveniently operate the seedling in the incubator on each, the cage that is equipped with can make each seedling mutually independent, the cam that is equipped with can drive the movable plate and remove, thereby makes each row of seedling that is located on the movable plate remove, thereby conveniently draws the seedling and transplant.

The seedling in incubator and the last incubator of drawing water through the shower nozzle down can be followed to the water pump that is equipped with and waters, and unnecessary moisture gets into the second sponge strip through the filter, gets into the recovery water tank through the wash port again, and the hydroenergy that persists in the second sponge strip can provide sufficient moisture to the seedling, can be continuous through first sponge strip simultaneously and supply moisture to the second sponge strip.

Temperature sensor who is equipped with, temperature humidity and carbon dioxide concentration in carbon dioxide concentration sensor and the humidity transducer can the control casing, through temperature information, the PLC controller can control the air conditioner, cool down or heat up the temperature in the casing, can control whether the water pump can water the seedling through humidity information, can control whether the solenoid valve provides carbon dioxide in to the casing through carbon dioxide concentration, provide the photosynthesis raw materials, moreover, the steam generator is simple in structure, high durability and convenient use, can greatly reduced labour, can carry out fine cultivation to the seedling, seedling transplanting is convenient simultaneously, can improve the survival rate of seedling transplanting greatly, and is worth using widely.

Drawings

FIG. 1 is a schematic front view of a seedling growing device for agricultural use to facilitate transplanting of seedling plants according to the present invention;

FIG. 2 is a schematic diagram of an expanded structure of a seedling cultivation device for agricultural use for facilitating transplanting of seedling plants according to the present invention;

FIG. 3 is a schematic view of a cage structure of a seedling cultivation device for agricultural use for facilitating transplanting of seedling plants according to the present invention;

FIG. 4 is a schematic view of the internal structure of a second housing of a seedling culture device for agricultural use to facilitate transplanting of seedling plants according to the present invention;

FIG. 5 is a schematic diagram of the internal structure of a cultivation box of a seedling cultivation device for agricultural use to facilitate transplanting of seedling plants;

FIG. 6 is a schematic diagram of a partition structure of a seedling cultivation device for agricultural use to facilitate transplanting of seedling plants according to the present invention;

FIG. 7 is a schematic left side view of a seedling growing device for agricultural use to facilitate transplanting of seedling plants according to the present invention;

FIG. 8 is a schematic structural diagram of a control principle of a seedling cultivation device for agricultural use to facilitate transplanting of seedling plants according to the present invention.

In the figure: the device comprises a storage battery 1, a carbon dioxide storage 2, a first shell 3, an electromagnetic valve 4, a water pump 5, a water tank 6, a PLC (programmable logic controller) 7, an air conditioner 8, a temperature sensor 9, an intermediate rod 10, a cross rod 11, a moving wheel 12, a partition plate 13, a first sponge strip 14, a recovery water tank 15, a shell 16, a lower incubator 17, an upper incubator 18, a cover door 19, a first rotating rod 20, a humidity sensor 21, a support leg 22, a U-shaped frame 23, a carbon dioxide concentration sensor 24, a chute 25, a second sponge strip 26, a water drain hole 27, a water inlet hole 28, a spray head 29, a filter plate 30, a slide block 31, a cam 32, a first rotating shaft 33, a moving plate 34, a through hole 35, a separation cover 36, a square hole 37, a second rotating shaft 38, a motor 39, a worm gear reducer 40, a second rotating shaft 41, a through hole 43, a rectangular hole 44, a.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-8, an agricultural seedling cultivation device for transplanting seedlings comprises a housing 16, wherein moving wheels 12 are symmetrically arranged on two sides of the lower surface of the housing 16, and the moving wheels 12 are self-locking moving wheels, so that the device can be moved conveniently and can be fixed.

The both sides of casing 16 all have lid door 19 through hinge connection, and the middle part of lid door 19 and the front and the back of casing 16 all are equipped with light trap 45, and clear glass is all installed to the inside of light trap 45, makes things convenient for the printing opacity to improve the photosynthesis of seedling.

The edges of the cover door 19 are all provided with rubber sealing gaskets, so that the interior of the device is in a sealed state, and the growing environment of seedlings is better.

The middle part of the lower surface of the inner side of the shell 16 is provided with a recovery water tank 15, the upper surface of the recovery water tank 15 is vertically provided with a partition plate 13, the upper end of the partition plate 13 is fixedly connected with the shell 16, both sides of the partition plate 13 are provided with rectangular holes 44, the inside of the partition plate 13 is provided with a first sponge strip 14, the first sponge strip 14 penetrates through the rectangular holes 44, the lower end of the first sponge strip 14 extends into the recovery water tank 15, one side of the partition plate 13 is symmetrically provided with through holes 43, both upper parts of both sides of the partition plate 13 are provided with fluorescent lamps 46, both sides of the lower surface of the inside of the shell 16 are fixedly provided with a lower incubator 17, the middle part and the lower part of the upper part of one side of the lower incubator 17 are respectively connected with a second rotating rod 41, an intermediate rod 10 and a first rotating rod 20 in parallel through a pin, the use effect is improved.

One side of the second rotating rod 41 and one side of the first rotating rod 20 are jointly connected with a plurality of upper incubators 18 through pin shafts, one side of the second rotating rod 41 and one side of the first rotating rod 20, which are far away from the upper incubators 18, are jointly connected with a cross rod 11 corresponding to the upper incubators 18 through pin shafts, the middle parts of the cross rods 11 are rotationally connected with the middle rod 10 through pin shafts, the lower part of one side of the shell 16 is fixedly provided with a second shell 48, the inside of the second shell 48 is symmetrically provided with a motor 39 and a worm gear reducer 40, the output end of the motor 39 is fixedly connected with the input end of the worm gear reducer 40, the lower end of the middle rod 10 is fixedly connected with a second rotating shaft 38, one end of the second rotating shaft 38 penetrates through the shell 16 and the second shell 48 to be fixedly connected with the output end of the worm gear reducer 40, both sides of, one side of the U-shaped frame 23 is provided with a water inlet 28, the lower surface of the U-shaped frame 23 is uniformly provided with a plurality of spray heads 29, the interiors of the lower incubator 17 and the upper incubator 18 are provided with a filter plate 30, the inner lower surfaces of the lower incubator 17 and the upper incubator 18 are provided with a second sponge strip 26, one end of the second sponge strip 26 positioned in the upper incubator 18 penetrates through the upper incubator 18 to be abutted against the first sponge strip 14, the lower parts of one sides of the lower incubator 17 and the upper incubator 18 are provided with drain holes 27, the drain holes 27 are connected with the recovery water tank 15 through water pipes, the middle parts of the inner sides of the lower incubator 17 and the upper incubator 18 are provided with a plurality of first rotating shafts 33, one end of each first rotating shaft 33 penetrates through the lower incubator 17 and the upper incubator 18, the outer side of each first rotating shaft 33 is fixedly provided with a plurality of cams 32, the upper parts of two inner sides of the lower incubator 17 and the upper incubator 18 are provided with a plurality of chutes 25 corresponding to the first, the sliding blocks 31 are mounted inside the sliding grooves 25, the moving plate 34 is fixedly mounted between the two corresponding sliding blocks 31, a plurality of through holes 35 are formed in one side of the moving plate 34, the isolation cover 36 matched with the upper incubator 18 is mounted on the upper surface of the moving plate 34, a plurality of square holes 37 are formed in one side of the isolation cover 36, each row of square holes 37 correspond to the moving plate 34, seedlings can be mutually independent, and therefore the seedlings can be taken out conveniently.

The temperature sensor 9, the humidity sensor 21 and the carbon dioxide concentration sensor 24 are mounted on the inner upper surface of the shell 16, the models of the temperature sensor 9, the humidity sensor 21 and the carbon dioxide concentration sensor 24 are TP100, HIH-3206 and TGS4160 respectively, the first shell 3 is fixedly mounted at the upper end of the shell 16, a box door 47 is connected to one side of the first shell 3 through a hinge, a buckle is mounted on one side of the box door 47, the first shell 3 is opened conveniently, and therefore parts inside the first shell 3 are maintained conveniently.

The internally mounted of first shell 3 has battery 1, carbon dioxide accumulator 2, water pump 5, water tank 6, PLC controller 7 and air conditioner 8, the outlet duct is installed to the gas outlet of carbon dioxide accumulator 2, and the one end of outlet duct runs through casing 16, and install solenoid valve 4 on the pipeline of outlet duct, the water inlet of water pump 5 is connected with water tank 6, the delivery port of water pump 5 is connected with the outlet pipe, and the outlet pipe runs through casing 16 and is connected with inlet opening 28, the air outlet of air conditioner 8 is connected with casing 16 through going out the tuber pipe, battery 1, solenoid valve 4, water pump 5, PLC controller 7, air conditioner 8, temperature sensor 9, humidity transducer 21, connect through the wire between carbon dioxide concentration sensor 24 and the motor 39.

The working principle is as follows: when the device is used, the isolation cover 36 is placed on the upper surface of the moving plate 34, soil is distributed in the square holes 37, seedling seeds are cultivated through the soil, corresponding signals can be detected through the carbon dioxide concentration sensor 24, the temperature sensor 9 and the humidity sensor 21, the carbon dioxide concentration is monitored through the carbon dioxide concentration sensor 24, the signals are transmitted to the PLC 7, the PLC 7 controls whether the electromagnetic valve 4 is opened or not, whether carbon dioxide is supplied to the shell 16 or not, the temperature sensor 9 monitors the temperature and transmits the signals to the PLC 7, the PLC 7 controls the air conditioner 8 to reduce or raise the temperature in the shell 16, the humidity sensor 21 monitors the humidity signals and transmits the signals to the PLC 7, when the PLC 7 controls the on-off of the water pump 5, seedlings need to be watered, water flows from the filter plate 30 to the second sponge strips 26 after being watered, then the water flows to the recovery water tank 15 through the drain hole 27, the water in the second sponge strip 26 provides water for the seedlings, meanwhile, the water in the recovery water tank 15 is transmitted to the second sponge strip 26 through the first sponge strip 14, so that the water in the second sponge strip 26 is sufficient, at night, the fluorescent lamp 46 can be turned on to increase the illumination time, the growth of the seedlings is accelerated, when transplanting is needed, the cover door 19 is opened, the motor 39 is started, the worm gear reducer 40 drives the second rotating shaft 38 to rotate, the second rotating shaft 38 drives the intermediate rod 10 to rotate, the upper incubator 18 is unfolded under the action of the first rotating rod 20, the second rotating rod 41 and the transverse rod 11, the isolation cover 36 is taken out, the seedlings are independent of each other, the first rotating shaft 33 is rotated, the first rotating shaft 33 drives the moving plate cam 32 to rotate, the cam 32 moves the moving plate 34, so as to drive the seedlings to jack up, and.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides an agricultural is with seedling culture device who is convenient for transplant seedling plant, agricultural is with seedling culture device who is convenient for transplant seedling plant includes casing (16), its characterized in that, there is lid door (19) both sides of casing (16) all through hinge connection, the inboard lower surface mid-mounting of casing (16) has recovery tank (15), recovery tank's (15) last vertical surface installs baffle (13), and the upper end and casing (16) fixed connection of baffle (13), the both sides of baffle (13) all are equipped with rectangular hole (44), the internally mounted of baffle (13) has first sponge strip (14), and first sponge strip (14) run through rectangular hole (44), the lower extreme of first sponge strip (14) extends to the inside of recovery tank (15), one side symmetry of baffle (13) is equipped with through-hole (43), fluorescent lamps (46) are installed on the upper portions of the two sides of the partition plate (13), lower incubators (17) are fixedly installed on the two sides of the lower surface of the inner portion of the shell (16), one upper portion, the middle portion and the lower portion of one side of each lower incubator (17) are respectively connected with a second rotating rod (41), an intermediate rod (10) and a first rotating rod (20) through pin shafts in parallel, one side of each of the second rotating rod (41) and the first rotating rod (20) is connected with a plurality of upper incubators (18) through pin shafts, one side of each of the second rotating rod (41) and the first rotating rod (20), which is far away from the upper incubators (18), is connected with a transverse rod (11) corresponding to the upper incubators (18) through pin shafts in common, the middle portion of each transverse rod (11) is rotatably connected with the intermediate rod (10) through pin shafts, and a second shell, motor (39) and worm gear speed reducer (40) are installed to the inside symmetry of second shell (48), the output of motor (39) and the input fixed connection of worm gear speed reducer (40), the equal fixedly connected with second pivot (38) of lower extreme of intermediate lever (10), the one end of second pivot (38) runs through the output fixed connection of casing (16) and second shell (48) and worm gear speed reducer (40), the equal fixed mounting of the lower surface of the inboard upper surface both sides of casing (16) and last incubator (18) has U type frame (23), one side of U type frame (23) all is equipped with inlet opening (28), a plurality of shower nozzles (29) are evenly installed to the lower surface of U type frame (23), filter (30) are all installed to the inside of incubator (17) and last incubator (18) down, incubator (17) and the inside lower surface of last incubator (18) all install second sponge strip (26) ) One end of a second sponge strip (26) positioned inside the upper incubator (18) penetrates through the upper incubator (18) to be abutted against the first sponge strip (14), drain holes (27) are formed in the lower portions of one sides of the lower incubator (17) and the upper incubator (18), the drain holes (27) are connected with a recovery water tank (15) through water pipes, a plurality of first rotating shafts (33) are arranged in the middle portions of the inner sides of the lower incubator (17) and the upper incubator (18), one ends of the first rotating shafts (33) penetrate through the lower incubator (17) and one ends of the first rotating shafts (33) to penetrate through the upper incubator (18), a plurality of cams (32) are fixedly arranged on the outer sides of the first rotating shafts (33), a plurality of sliding grooves (25) corresponding to the first rotating shafts (33) are arranged on the upper portions of two sides of the inner portions of the lower incubator (17) and the upper incubator (18), and sliding blocks (31) are arranged inside the sliding grooves (25), a moving plate (34) is fixedly installed between the two corresponding sliders (31), a plurality of through holes (35) are formed in one side of the moving plate (34), a separation cover (36) matched with the upper incubator (18) is installed on the upper surface of the moving plate (34), a temperature sensor (9), a humidity sensor (21) and a carbon dioxide concentration sensor (24) are installed on the upper surface of the interior of the shell (16), a first shell (3) is fixedly installed at the upper end of the shell (16), a storage battery (1), a carbon dioxide storage device (2), a water pump (5), a water tank (6), a PLC (7) and an air conditioner (8) are installed inside the first shell (3), an air outlet pipe is installed at an air outlet of the carbon dioxide storage device (2), one end of the air outlet pipe penetrates through the shell (16), and an electromagnetic valve (4) is installed on the pipeline of, the water inlet of the water pump (5) is connected with the water tank (6), the water outlet of the water pump (5) is connected with a water outlet pipe, the water outlet pipe penetrates through the shell (16) and is connected with the water inlet hole (28), the air outlet of the air conditioner (8) is connected with the shell (16) through an air outlet pipe, and the storage battery (1), the electromagnetic valve (4), the water pump (5), the PLC (7), the air conditioner (8), the temperature sensor (9), the humidity sensor (21), the carbon dioxide concentration sensor (24) and the motor (39) are connected through wires.

2. A seedling raising device for agricultural use facilitating transplanting of seedling plants as claimed in claim 1, wherein the cover door (19) is provided at its middle portion and at the front and rear surfaces of the housing (16) with light-transmitting holes (45), and transparent glass is installed inside the light-transmitting holes (45).

3. A seedling raising device for agricultural use to facilitate the transplanting of seedling plants, as claimed in claim 1, wherein the edges of said cover door (19) are fitted with rubber gaskets.

4. A seedling culture device for agricultural use facilitating transplanting of seedling plants, as claimed in claim 1, wherein the housing (16) is provided with moving wheels (12) symmetrically mounted on both sides of the lower surface thereof, and the moving wheels (12) are self-lockable.

5. A seedling culture device for facilitating transplanting of seedling plants in agriculture according to claim 1, wherein said cage (36) is provided at one side thereof with a plurality of square holes (37), each row of said square holes (37) corresponding to a moving plate (34).

6. A seedling growing device for agricultural use to facilitate the transplanting of young plant plants, as claimed in claim 1, wherein a door (47) is hinged to one side of said first housing (3), and wherein a snap is mounted to one side of said door (47).

7. A seedling culture device for agricultural use facilitating transplanting of seedling plants, as claimed in claim 1, wherein the upper ends of the intermediate rods (10) are each fixedly mounted with a support leg (22), and the support legs (22) are length-adjustable support legs.