A dust falling device with adjustable dust falling area for road construction

Abstract

The application discloses a road construction dust falling device with adjustable dust falling area in the technical field of road construction dust falling, which comprises a surrounding baffle, a base attached to the surrounding baffle, a pipeline rotatably installed on the base and connected with an external water pipe for conveying spraying water, a plurality of spray heads rotatably installed on the pipeline at equal intervals and communicated with the pipeline, a detection mechanism installed in the base and used for detecting a wind direction, a driving mechanism installed on the side of the pipeline and capable of adjusting the inclination of the pipeline and the spray heads according to the detection result of the detection mechanism to adjust the spraying direction of the spraying water, and a water pressure changing mechanism arranged on the side of the pipeline and capable of changing the water pressure when the spray head sprays water to adjust the spraying area.

Description

Technical Field

[0001] This invention relates to the field of dust suppression technology in road construction, specifically to a dust suppression device with adjustable dust suppression area for road construction. Background Technology

[0002] During road construction, barriers are installed along the roadside to separate the construction site from the external roads. The construction process generates a large amount of dust, which is carried by construction vehicles entering and leaving the site, and by the wind, affecting vehicles and pedestrians. Therefore, spraying systems are often installed on the barriers to mitigate dust. However, wind speeds limit the spraying range and can easily blow water mist onto the external roads. Since the area adjacent to the barriers is typically a non-motorized vehicle lane, used by non-motorized vehicles and pedestrians, the water mist blowing outside the barriers can obstruct their passage, posing a significant traffic hazard.

[0003] Based on this, the present invention designs a dust suppression device with adjustable dust suppression area for road construction to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a dust suppression device with an adjustable dust suppression area for road construction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dust suppression device with adjustable dust suppression area for road construction, comprising a baffle plate, and further comprising: a base attached to the baffle plate; a pipe rotatably mounted on the base and connected to an external water pipe for conveying spray water; multiple nozzles equidistantly rotatably mounted on and connected to the pipe; a detection mechanism installed inside the base for detecting wind direction; a drive mechanism installed on the side of the pipe and capable of adjusting the pipe and nozzle tilt angle according to the detection results of the detection mechanism, thereby adjusting the spray direction of the spray water; and a water pressure conversion mechanism installed on the side of the pipe and capable of changing the water pressure when the nozzles spray water, thereby adjusting the spray area.

[0006] As a further embodiment of the present invention, the detection mechanism includes: a detection head installed in the middle of the base, the bottom end of the detection head being connected to the base via an elastic element; four pressure plates arranged in a circumferential array about the detection head; one end of each pressure plate being rotatably connected to the base, and the other end being hinged to a stop; a pressing component fixedly installed in the middle of the detection head; the stop abutting against the outer wall of the pressing component; when the detection head tilts under wind force, it can press the pressure plate at the same position as the wind direction by the pressing component cooperating with the stop.

[0007] As a further embodiment of the present invention, the pressure plate is made of elastic steel strip material and has an arc shape with high ends and low middle.

[0008] As a further embodiment of the present invention, the extrusion component is configured as a frustum shape that is wider at the top and narrower at the bottom.

[0009] As a further embodiment of the present invention, the driving mechanism includes hydraulic cylinders, two first gears, and multiple second gears; four hydraulic cylinders are configured, the same as the pressure plates, and the bottom ends of the four hydraulic cylinders are fixedly connected to the base, with their telescopic ends located below the center of the four pressure plates; one-way bearings are installed on the inner walls of the two first gears, and the two one-way bearings rotate in opposite directions; each of the two first gears meshes with two first racks, and the two first racks are centrally symmetrically distributed about the center of the first gear; each first rack is fixedly connected to a first piston rod, and each first piston rod is slidably connected to a first cylinder body; the left and right first cylinder bodies are respectively connected to the front through first hoses. The two hydraulic cylinders are connected; multiple second gears are fixedly mounted on the rotating shaft of the nozzle, and the multiple second gears mesh with a second rack; the second rack is elastically slidably connected to the pipeline; two symmetrically arranged wedge-shaped drive blocks are provided on the side of the second rack; each wedge-shaped drive block is slidably connected to the pipeline, and each wedge-shaped drive block is rotatably connected to a connecting rod, and each connecting rod is rotatably connected to a slider at the end away from the wedge-shaped drive block; each slider is fixedly connected to a second piston rod; each second piston rod is slidably connected to a second cylinder; the second cylinder is fixedly connected to the pipeline; the second cylinders on the left and right sides are respectively connected to the hydraulic cylinders on the right and left sides through second hoses.

[0010] As a further embodiment of the present invention, the water pressure conversion mechanism includes a squeezing tube installed inside the nozzle; the squeezing tube is configured as a funnel shape that is wide at both ends and narrow in the middle; a tightening sleeve is fixedly connected to the outer wall of the squeezing tube; one end of the tightening sleeve penetrates the side wall of the nozzle and extends to the outside of the nozzle; two adjacent tightening sleeves are fixedly connected by a first steel rope; a second steel rope is fixedly connected to the rightmost tightening sleeve, and the end of the second steel rope away from the rightmost tightening sleeve is fixedly connected to the base.

[0011] As a further embodiment of the present invention, the water pressure conversion mechanism includes a booster pump, which is connected to a pipeline.

[0012] As a further embodiment of the present invention, a guide rail is installed at the bottom of the base, and the guide rail can slide on the enclosure plate.

[0013] As a further embodiment of the present invention, the guide rail is driven by rollers.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention, through the arrangement of pipes, nozzles, a detection mechanism, and a drive mechanism, allows the detection mechanism to detect wind direction and, in conjunction with the drive mechanism, adjust the tilt angle of the pipes and nozzles. This counteracts the impact of wind on the spraying range, ensuring that the sprayed water falls within the original area. This prevents the wind from blowing the sprayed water into the non-motorized vehicle lane, thus avoiding obstruction of non-motorized vehicles and pedestrians. Simultaneously, the water pressure conversion mechanism can change the pressure of the nozzles when spraying water, thereby adjusting the spraying range of the water mist in windy weather and allowing airborne dust to better follow the water mist and fall to the ground. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the base and detection mechanism of the present invention;

[0018] Figure 3 This is a schematic diagram of the pipe, nozzle, and drive mechanism of the present invention.

[0019] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0020] Figure 5 This is a schematic diagram of the drive mechanism structure of the present invention;

[0021] Figure 6 for Figure 5 Enlarged view of a section at point B in the middle;

[0022] Figure 7 This is a cross-sectional schematic diagram of the nozzle, extrusion rod, and tightening sleeve structure of the present invention;

[0023] Figure 8 This is a schematic diagram showing the rotation direction of the pipeline in this invention;

[0024] Figure 9 This is a schematic diagram showing the rotation direction of the nozzle of the present invention.

[0025] In the attached diagram: 1-Baffle plate, 2-Base, 3-Pipe, 4-Nozzle, 5-Detection head, 6-Elastic element, 7-Pressure plate, 8-Abutment seat, 9-Extrusion component, 10-Hydraulic cylinder, 11-First gear, 12-Second gear, 13-One-way bearing, 14-First rack, 15-First piston rod, 16-First cylinder body, 17-First hose, 18-Second rack, 19-Wedge drive block, 20-Connecting rod, 21-Slider, 22-Second piston rod, 23-Second cylinder body, 24-Second hose, 25-Extrusion tube, 26-Tightening sleeve, 27-First steel rope, 28-Second steel rope, 29-Booster pump, 30-Guide rail. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-9 This invention provides a technical solution: a dust suppression device with adjustable dust suppression area for road construction, including a baffle plate 1, a base 2, a pipe 3, nozzles 4, a detection mechanism, a drive mechanism, and a water pressure conversion mechanism; the base 2 is attached to the baffle plate 1; the pipe 3 is rotatably installed on the base 2 and connected to an external water pipe for conveying spray water; multiple nozzles 4 are provided, and the multiple nozzles 4 are equidistantly rotatably installed on the pipe 3 and connected to the pipe 3; the detection mechanism is installed inside the base 2 and is used to detect the wind direction; the drive mechanism is installed on the side of the pipe 3 and can adjust the tilt angle of the pipe 3 and the nozzles 4 according to the detection results of the detection mechanism, thereby adjusting the spray direction of the spray water; the water pressure conversion mechanism is located on the side of the pipe 3 and can change the water pressure when the nozzles 4 spray water, thereby adjusting the spray area.

[0028] When installing the dust suppression device of this invention, the base 2 is installed on the enclosure plate 1, and then the pipe 3 is connected to the external water pipe. The water pipe delivers spray water into the pipe 3, and then the water in the pipe 3 is sprayed out from the nozzle 4. The water droplets carry the dust in the air and fall to the ground, achieving the effect of dust suppression. In the initial state, the pipe 3 is at a 45° angle to the construction road surface. In windy weather, the detection mechanism can detect the direction of the wind, and then the detection mechanism can cooperate with the drive mechanism to adjust the tilt angle of the pipe 3 and the nozzle 4. Specifically, as follows: Figure 8 As shown, when the wind force is F1, the wind direction blows towards the inside of the enclosure 1, and the sprayed water will concentrate in the middle of the construction area under the action of the wind. At this time, the drive mechanism will drive the pipe 3 to rotate at the angle corresponding to f1, and the angle between the pipe 3 and the construction road surface will increase, thereby counteracting the wind force and keeping the sprayed water drop area within the original area. When the wind force is F2, the wind direction blows towards the outside of the enclosure 1, and the sprayed water will be blown towards the non-motorized vehicle lane under the action of the wind. At this time, the drive mechanism will drive the pipe 3 to rotate at the angle corresponding to f2, and the angle between the pipe 3 and the construction road surface will decrease. The water mist sprayed from the nozzle 4 can quickly fall onto the construction road surface, thereby preventing the wind from blowing the sprayed water into the non-motorized vehicle lane and affecting the passage of non-motorized vehicles and pedestrians. Figure 9As shown, when the wind force is F3, the wind direction blows towards the left side of the enclosure 1, and the spraying direction of the nozzle 4 will be deflected under the action of the wind. At this time, the drive mechanism will drive the nozzle 4 to rotate at the angle corresponding to f3, and the nozzle 4 will rotate to the right, thereby counteracting the effect of the wind on the spraying range and keeping the sprayed water drop area within the original area. When the wind force is F4, the wind direction blows towards the right side of the enclosure 1, and the spraying direction of the nozzle 4 will be deflected under the action of the wind. At this time, the drive mechanism will drive the nozzle 4 to rotate at the angle corresponding to f4, and the nozzle 4 will rotate to the left, thereby counteracting the effect of the wind on the spraying range and keeping the sprayed water drop area within the original area. The water pressure conversion mechanism can change the pressure of the nozzle 4 when spraying water, thereby adjusting the spraying range of the water mist in windy weather, so that the dust in the air can better follow the water mist and fall to the ground.

[0029] Specifically, such as Figure 2 As shown, the testing mechanism includes: a testing head 5, four pressure plates 7, and a pressing component 9; the testing head 5 is installed in the middle of the base 2, and the bottom end of the testing head 5 is connected to the base 2 through an elastic element 6; the four pressure plates 7 are arranged in a circumferential array about the testing head 5; one end of the pressure plate 7 is rotatably connected to the base 2, and the other end is hinged to a stop 8; the pressing component 9 is fixedly installed in the middle of the testing head 5; the stop 8 abuts against the outer wall of the pressing component 9; when the testing head 5 tilts under the action of wind, it can press the pressure plate 7 at the same position as the wind direction through the pressing component 9 in conjunction with the stop 8.

[0030] In windy weather, the wind will drive the detection head 5 to twist. The twisting direction of the detection head 5 is the same as the wind direction. When the detection head 5 twists, it will squeeze the abutment 8 located in its twisting direction through the squeezing component 9. The abutment 8 will drive the pressure plate 7 to bend, thereby detecting the wind direction.

[0031] Specifically, the pressure plate 7 is made of elastic steel strip material and has an arc shape that is high at both ends and low in the middle. Setting the pressure plate 7 to an arc shape that is high at both ends and low in the middle can ensure that the pressure plate 7 will bend downward when the detection head 5 is twisted.

[0032] Specifically, the extrusion component 9 is designed as a frustum shape that is wider at the top and narrower at the bottom, which can better abut against the abutment 8. At the same time, when the detection head 5 is twisted, the extrusion component 9 can better transmit the force to the abutment 8.

[0033] Specifically, such as Figure 2 , Figures 4-6 , Figure 8 and Figure 9As shown, the drive mechanism includes hydraulic cylinders 10, two first gears 11, and multiple second gears 12. Four hydraulic cylinders 10 are configured, identical to the pressure plate 7. The bottom ends of all four hydraulic cylinders 10 are fixedly connected to the base 2, and their telescopic ends are located below the center of each of the four pressure plates 7. One-way bearings 13 are installed on the inner walls of both first gears 11, with opposite rotational directions. Each of the two first gears 11 meshes with two first racks 14, which are centrally symmetrical about the center of the first gear 11. Each first rack 14 is fixedly connected to a first piston rod 15, and each first piston rod 15 is slidably connected to a first cylinder body 16. The left and right first cylinder bodies 16 are connected to the front and rear hydraulic cylinders 12 respectively via first hoses 17. 0. Connected; multiple second gears 12 are fixedly installed on the rotating shaft of the nozzle 4, and the multiple second gears 12 mesh together with the second rack 18; the second rack 18 is elastically slidably connected to the pipe 3; two wedge-shaped drive blocks 19 are arranged symmetrically on the side of the second rack 18; the wedge-shaped drive blocks 19 are all slidably connected to the pipe 3, and each wedge-shaped drive block 19 is rotatably connected to a connecting rod 20, and the end of the connecting rod 20 away from the wedge-shaped drive block 19 is rotatably connected to a slider 21; each slider 21 is fixedly connected to a second piston rod 22; each second piston rod 22 is slidably connected to a second cylinder 23; the second cylinder 23 is fixedly connected to the pipe 3; the second cylinders 23 on the left and right sides are respectively connected to the hydraulic cylinders 10 on the right and left sides through the second hoses 24.

[0034] When the wind force is in a front-to-back direction (i.e., F1 or F2), the detection head 5 will drive the front or rear pressure plate 7 to bend downwards. The pressure plate 7 will drive the free end of the front or rear hydraulic cylinder 10 to move downwards. The hydraulic oil in the hydraulic cylinder 10 will enter the first cylinder body 16 on the left and right sides through the first hose 17. The first piston rod 15 will extend forward, and the first piston rod 15 will drive the first rack 14 to move forward. Figure 5 and Figure 8 As shown, when the wind force is F1 (the wind blows forward, i.e., the inside of the enclosure 1). Figure 5 The first rack 14 on the right side will move forward, and the first rack 14 will drive the first gear 11 to rotate; at this time, the first gear 11 on the right side will drive the pipe 3 to lift up at a certain angle through the one-way bearing 13; conversely, when the wind force is F2 (the wind blows to the rear, that is, the outside of the enclosure 1). Figure 5The first rack 14 on the left side moves forward, driving the first gear 11 to rotate. At this time, the first gear 11 on the left side drives the pipe 3 to rotate downwards by a certain angle via the one-way bearing 13. Since the two one-way bearings 13 rotate in opposite directions, the first gears 11 on both sides can drive the pipe 3 to rotate independently without driving the other first gear 11 to rotate. It should be noted that the rotation angle of the pipe 3 changes in real time with the wind force; the stronger the wind, the larger the rotation angle of the pipe 3, which better ensures that the sprayed water falls within the designated area. Furthermore, the maximum rotation angle can be adjusted according to the meshing length between the first rack 14 and the first gear 11 to prevent the pipe 3 from over-rotating. Figure 4 , Figure 6 and Figure 9 As shown, when the wind force is F3 (wind blowing to the left), the detection head 5 will drive the left pressure plate 7 to bend downwards. The pressure plate 7 will drive the free end of the left hydraulic cylinder 10 to move downwards. The hydraulic oil in the hydraulic cylinder 10 will enter the right second cylinder body 23 through the second hose 17. At this time, the right second piston rod 22 will move to the right and retract into the second cylinder body 23. The right second piston rod 22 will drive the bottom end of the right connecting rod 20 to move to the right synchronously through the slider 21. The top end of the right connecting rod 20 will drive the right wedge drive block 19 to move downwards. The right wedge drive block 19 will drive the second rack 18 to move to the left through the inclined plane. The second rack 18 will drive the nozzle 4 to rotate to the right through the second gear 12. The wind force can blow the spray water to the area that should be sprayed. When the wind force is F4 (wind blowing to the right), the opposite is true. Similarly, the rotation amplitude of the nozzle 4 is proportional to the wind force and within a certain range, which can better ensure that the spray water can fall into the designated area.

[0035] Specifically, such as Figure 3 , Figure 4 , Figure 7 as well as Figure 8 As shown, the water pressure conversion mechanism includes a squeezing tube 25 installed inside the nozzle 4; the squeezing tube 25 is configured as a funnel shape that is wide at both ends and narrow in the middle; a tightening sleeve 26 is fixedly connected to the outer wall of the squeezing tube 25; one end of the tightening sleeve 26 passes through the side wall of the nozzle 4 and extends to the outside of the nozzle 4; two adjacent tightening sleeves 26 are fixedly connected by a first steel rope 27; a second steel rope 28 is fixedly connected to the rightmost tightening sleeve 26, and the end of the second steel rope 28 away from the rightmost tightening sleeve 26 is fixedly connected to the base 2.

[0036] When pipe 3 flips in the direction of f2, since the end of the second steel rope 28 away from the nozzle 4 is connected to the base 2, the other end of the second steel rope 28 will drive the rightmost tightening sleeve 26 to tighten. At this time, under the action of the first steel rope 27, all the tightening sleeves 26 will tighten synchronously. After the tightening sleeves 26 tighten, the cross-sectional area of ​​the middle section of the squeezing pipe 25 decreases. At this time, the water pressure increases, the dust suppression water spraying area can be increased, and the influence of wind on the dust suppression range can also be offset. Compared with the use of a booster pump, the water pressure conversion mechanism of this embodiment can take effect immediately with the rotation of pipe 3, and the boosting amplitude of the sprayed water can increase with the rotation angle of pipe 3.

[0037] Specifically, such as Figure 1 As shown, the water pressure conversion mechanism includes a booster pump 29, which is connected to the pipe 3. The booster pump 29 can directly increase the pressure of the water sprayed out of the pipe 3. Compared with the use of the squeeze tube 25 and the tightening sleeve 26, the booster pump 29 has a simple structure and can change the water pressure even in windless weather, thereby adjusting the spraying area.

[0038] Specifically, a guide rail 30 is installed at the bottom of the base 2, and the guide rail 30 can slide on the enclosure plate 1; the guide rail 30 is driven by rollers; the rollers can drive the guide rail 30 to slide on the enclosure plate 1, thereby allowing the pipe 3 and the nozzle 4 to move and spray, which can improve the spraying efficiency and area.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dust falling device with adjustable dust falling area for road construction, comprising a surrounding baffle (1), characterized in that: Also include: Base (2), attached to the fence (1); Pipeline (3), rotatingly installed on the base (2) and connected with external water pipe for conveying spraying water; Spray head (4) is provided with a plurality of, a plurality of said spray head (4) equidistantly rotatingly installed on the pipe (3) and communicated with the pipe (3); Detection mechanism, installed in the base (2) and used for detecting wind direction; Drive mechanism, installed on the side of the pipe (3) and capable of adjusting the inclination of the pipe (3) and the spray head (4) according to the detection result of the detection mechanism, adjusting the spraying direction of the spraying water; Water pressure changing mechanism, provided on the side of the pipe (3) and capable of changing the water pressure when the spray head (4) sprays water, so as to adjust the spraying area; The detection mechanism comprises: a detection head (5) installed in the middle of the base (2), the bottom end of the detection head (5) being connected with the base (2) through an elastic element (6); Four pressing plates (7) are arranged in a circumferential array about the detection head (5); one end of the pressing plate (7) is rotatably connected with the base (2), and the other end is hingedly connected with an abutment (8); The extrusion part (9) is fixedly installed in the middle of the detection head (5); the abutment (8) abuts against the outer side wall of the extrusion part (9); When the detection head (5) tilts under the action of wind force, the pressing plate (7) on the same position as the wind direction can be extruded by the extrusion part (9) cooperating with the abutment (8); The drive mechanism comprises a hydraulic cylinder (10), two first gears (11) and a plurality of second gears (12); The hydraulic cylinder (10) is provided as four as the pressing plate (7), and the bottom end of the four hydraulic cylinders (10) is fixedly connected with the base (2), and the telescopic end is located below the middle of the four pressing plates (7) respectively; The inner wall of the two first gears (11) is provided with a one-way bearing (13), and the rotatable directions of the two one-way bearings (13) are opposite; the two first gears (11) are engaged with two first racks (14), and the two first racks (14) are centrally symmetrically distributed about the center of the first gear (11); the first rack (14) is fixedly connected with a first piston rod (15), and the first piston rod (15) is slidably connected with a first cylinder body (16); the left and right first cylinder bodies (16) are communicated with the front and rear hydraulic cylinders (10) through first hoses (17) respectively; A plurality of second gears (12) are fixedly installed on the rotating shaft of the spray head (4), and a plurality of second gears (12) are in mesh with a second rack (18); the second rack (18) is in elastic sliding connection with the pipeline (3); the side of the second rack (18) is provided with two symmetrically arranged wedge-shaped drive blocks (19); the wedge-shaped drive blocks (19) are in sliding connection with the pipeline (3), and the wedge-shaped drive blocks (19) are rotatably connected with connecting rods (20), and the connecting rods (20) are rotatably connected with sliding blocks (21) away from the wedge-shaped drive blocks (19); the sliding blocks (21) are fixedly connected with second piston rods (22); the second piston rods (22) are in sliding connection with second cylinder bodies (23); the second cylinder bodies (23) are fixedly connected with the pipeline (3); the left and right second cylinder bodies (23) are in communication with the right and left hydraulic cylinders (10) through second hoses (24); The water pressure conversion mechanism comprises an extrusion pipe (25) installed in the spray head (4); the extrusion pipe (25) is provided in a funnel shape with wide ends and a narrow middle; the extrusion pipe (25) is fixedly connected with a tightening sleeve (26) on the outer wall; one end of the tightening sleeve (26) penetrates through the side wall of the spray head (4) and extends to the outside of the spray head (4); two adjacent tightening sleeves (26) are fixedly connected by a first steel rope (27); the rightmost tightening sleeve (26) is fixedly connected with a second steel rope (28), and one end of the second steel rope (28) away from the rightmost tightening sleeve (26) is fixedly connected with the base (2).

2. The dust fall device with adjustable dust fall area for road construction according to claim 1, characterized in that: The pressing plate (7) is made of elastic steel strip material and has an arc shape with high ends and a low middle.

3. The dust fall device with adjustable dust fall area for road construction according to claim 1, characterized in that: The extrusion component (9) is provided in a circular truncated cone shape with wide top and narrow bottom.

4. The dust fall area-adjustable dust fall device for road construction according to claim 1, characterized by: The water pressure conversion mechanism comprises a booster pump (29) in communication with the pipeline (3).

5. The dust fall area-adjustable dust fall device for road construction according to claim 1, characterized by: The base (2) is provided at the bottom end with a guide sliding rail (30) capable of sliding on the fence plate (1).

6. The dust fall area-adjustable dust fall device for road construction according to claim 5, characterized by: The guide sliding rail (30) is driven by a roller.

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