Vegetation recovery equipment for engineering slash in arid valley region

Abstract

The invention relates to the technical field of vegetation recovery equipment, in particular to drought valley area engineering slash vegetation recovery equipment which comprises a vehicle body, supporting blocks are symmetrically and fixedly mounted on the upper surface of the vehicle body, driving motors are mounted on the two supporting blocks through lifting blocks, and rotating rods and spiral blades are mounted on output shafts of the driving motors. A material storage box is fixedly installed on the vehicle body, a discharging pipe is connected to the side face of the material storage box, a rectangular hole is formed in the upper surface of the discharging pipe, a sealing plate is inserted into the rectangular hole in a sliding mode, and a transmission assembly is arranged on the vehicle body. After hole drilling is finished, one end of the discharging pipe is opened in a short time through mutual cooperation of the discharging pipe, the sealing plate and the transmission assembly, seeds in the storage box automatically slide into drilled holes, operation is easy, workers do not need to manually put the seeds into the holes, time and labor are saved, the planting efficiency is effectively improved, and the device is suitable for popularization and application. Meanwhile, the phenomenon of leaving is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of vegetation restoration equipment, and in particular to a vegetation restoration equipment for engineering sites in arid river valley areas. Background Art

[0002] Vegetation restoration in arid river valleys is a global environmental issue. In some areas where human activities such as engineering construction, mining, and agricultural expansion will lead to vegetation destruction in the area, which in turn causes problems such as soil erosion, land desertification, and ecological deterioration, the vegetation in the engineering sites is severely damaged and difficult to restore. If artificial vegetation restoration is not carried out, it will be difficult to restore natural vegetation. When performing vegetation restoration, a common method is to plant and restore vegetation in the area.

[0003] When planting and restoring vegetation, it is necessary to first drill holes in the ground using drilling equipment, and then workers will put vegetation seeds into the holes. The workers need to operate the drilling equipment while putting seeds into the holes, which is very inconvenient and has low planting efficiency. At the same time, seeds may be missed when being put in. Summary of the invention

[0004] The purpose of the present invention is to solve the following shortcomings in the prior art: workers are required to operate the drilling equipment while putting seeds into the holes, which is very inconvenient and has low planting efficiency. At the same time, seeds may be missed when being put in. A vegetation restoration device for engineering sites in arid river valley areas is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A vegetation restoration device for engineering sites in arid river valleys, comprising a vehicle body, a mounting hole is provided on the vehicle body, support blocks are symmetrically fixedly installed on the upper surface of the vehicle body, the mounting hole is located between two support blocks, lifting blocks are vertically slidably installed on the two support blocks through lifting components, a driving motor is fixedly installed between the two lifting blocks, a rotating rod is fixedly installed at one end of the output shaft of the driving motor, one end of the rotating rod passes through the mounting hole and is fixedly sleeved with a spiral blade;

[0007] A material storage box is fixedly installed on the vehicle body, and a discharge pipe is fixedly connected to the side of the material storage box at an angle, one end of the discharge pipe is connected to the inside of the material storage box, one end of the discharge pipe passes through a mounting hole, a rectangular hole is opened on the upper surface of the discharge pipe, a sealing plate is slidably inserted in the rectangular hole, an elastic component is provided in the mounting hole for driving the sealing plate to move vertically downward, and a transmission component for driving the sealing plate to move vertically upward is provided on the vehicle body.

[0008] As a preferred solution, the lifting assembly includes a lifting slot opened on the support block and an electric-controlled cylinder fixedly installed on the upper end of the support block, one end of the lifting block is slidably inserted in the lifting slot, and the output end of the electric-controlled cylinder is inserted in the lifting slot and fixedly connected to the lifting block.

[0009] As a preferred solution, the elastic component includes two brackets symmetrically fixed in the mounting holes, two vertical rods vertically fixed on the lower surface of the brackets, two first telescopic springs respectively sleeved on the two vertical rods, and two connecting blocks respectively slidably sleeved on the two vertical rods, the two ends of the first telescopic spring are respectively connected to the brackets and the connecting blocks, and the connecting blocks are fixedly connected to the sealing plate.

[0010] As a preferred solution, the transmission assembly includes a U-shaped frame sleeved on a rotating rod, an L-shaped mounting plate fixedly mounted on the U-shaped frame, a moving rod slidably mounted on the mounting plate through an elastic component, a magnet fixedly mounted on the lower end of the moving rod, and a metal rod fixedly mounted on the upper end of a sealing plate, a moving hole is opened on the mounting plate, the moving rod is vertically slidably inserted in the moving hole, the two ends of the U-shaped frame are respectively fixedly connected to two lifting blocks, and the magnet is located directly above the metal rod.

[0011] As a preferred solution, the elastic component includes a stopper fixedly mounted on the upper end of the moving rod and a second telescopic spring sleeved on the moving rod, the second telescopic spring is located above the mounting plate, and the two ends of the second telescopic spring are respectively connected to the mounting plate and the stopper.

[0012] As a preferred solution, the elastic coefficient of the second telescopic spring is greater than the elastic coefficient of the first telescopic spring, and the magnetic force between the magnet and the metal rod is greater than the elastic force of the first telescopic spring.

[0013] As a preferred solution, a water tank is fixedly installed on the vehicle body, a rectangular cylinder is fixedly installed in the installation hole, the rectangular cylinder and the water tank are connected by a water pipe, a connecting pipe is connected to the lower end of the rectangular cylinder, an arc-shaped pipe is fixedly connected to the lower end of the connecting pipe, a plurality of nozzles are installed on the arc-shaped pipe, the arc-shaped pipe is sleeved on the spiral blade, and a water spraying assembly for spraying water is provided on the U-shaped frame.

[0014] As a preferred solution, the water spray assembly includes a push plate sealingly and slidably mounted in a rectangular tube and an L-shaped push rod fixedly mounted on a U-shaped frame, one end of the push rod extends into the rectangular tube and is fixedly connected to the push plate.

[0015] As a preferred solution, a first one-way valve is installed in the water pipe, which only allows water to flow from the water tank into the rectangular tube, and a second one-way valve is installed in the connecting pipe, which only allows water to flow from the rectangular tube into the arc tube.

[0016] As a preferred solution, a push-pull handle is fixedly mounted on the vehicle body, a control switch for controlling two electrically controlled cylinders is mounted on the push-pull handle, and the control switch is electrically connected to the two electrically controlled cylinders.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the cooperation of the driving motor, lifting assembly, rotating rod and spiral blade, the ground can be drilled. At the same time, after the drilling is completed, through the cooperation of the discharge pipe, sealing plate, elastic assembly and transmission assembly, one end of the discharge pipe is opened in a short time, so that the seeds in the storage box automatically slide into the drilled hole. The operation is simple, and the staff does not need to manually put seeds into the hole, which saves time and effort, effectively improves the planting efficiency, and avoids the phenomenon of residue.

[0019] 2. While drilling holes in the ground, water can be sprayed between the spiral blades and the ground through the cooperation of the water spray assembly, rectangular tube, water tank, connecting pipe, water pipe, arc tube and nozzle. The sprayed water can suppress dust. At the same time, the sprayed water makes the ground soil moist when it contacts the ground, thereby facilitating the drilling of the spiral blades. The sprayed water can also provide nutrients for the seeds put in. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a plant for restoring vegetation on engineering sites in dry river valleys proposed by the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the support block, lifting assembly, drive motor, rotating rod and spiral blade;

[0022] Figure 3 It is a schematic diagram of a three-dimensional partial cross-section structure of a material storage box, a material discharge pipe and a transmission component;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of a water tank, a rectangular cylinder, a water spray assembly and an arc tube;

[0024] Figure 5 for Figure 3 The enlarged structural diagram at A in the middle;

[0025] Figure 6 for Figure 4 Enlarged structural diagram at B in the middle.

[0026] In the figure: 1 body, 2 support block, 3 lifting block, 4 drive motor, 5 rotating rod, 6 spiral blade, 7 storage box, 8 discharge pipe, 9 sealing plate, 10 lifting slot, 11 electric control cylinder, 12 bracket, 13 vertical rod, 14 first telescopic spring, 15 connecting block, 16 U-shaped frame, 17 mounting plate, 18 moving rod, 19 magnet, 20 metal rod, 21 stopper, 22 second telescopic spring, 23 water tank, 24 rectangular tube, 25 water pipe, 26 connecting pipe, 27 arc pipe, 28 nozzle, 29 push plate, 30 push rod, 31 push-pull handle, 32 control switch. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-Figure 6 A vegetation restoration device for engineering sites in an arid river valley area comprises a vehicle body 1, a mounting hole is provided on the vehicle body 1, support blocks 2 are symmetrically fixedly installed on the upper surface of the vehicle body 1, the mounting hole is located between the two support blocks 2, and lifting blocks 3 are vertically slidably installed on the two support blocks 2 through a lifting assembly, a driving motor 4 is fixedly installed between the two lifting blocks 3, a rotating rod 5 is fixedly installed at one end of the output shaft of the driving motor 4, one end of the rotating rod 5 passes through the mounting hole and is fixedly sleeved with a spiral blade 6, the lifting assembly comprises a lifting slot 10 provided on the support block 2 and an electric control cylinder 11 fixedly installed on the upper end of the support block 2, one end of the lifting block 3 is slidably inserted in the lifting slot 10, and the output end of the electric control cylinder 11 is inserted in the lifting slot 10 and fixedly connected to the lifting block 3.

[0029] The driving motor 4 is installed between the two supporting blocks 2 through two lifting blocks 3, and can move up and down between the two supporting blocks 2. The electric control cylinder 11 is installed on the upper end of the supporting block 2, and the output end of the electric control cylinder 11 is connected to the lifting block 3. The lifting block 3 can be driven to move up and down in the lifting groove 10 by controlling the electric control cylinder 11. When the driving motor 4 is started, the spiral blade 6 can be driven to rotate by the rotating rod 5. When the lower end of the spiral blade 6 contacts the ground, it also drives the spiral blade 6 to move vertically downward, and the spiral blade 6 can drill holes in the ground.

[0030] A push-pull handle 31 is fixedly installed on the vehicle body 1, and a control switch 32 for controlling the two electric-controlled cylinders 11 is installed on the push-pull handle 31 (the control switch 32 is a prior art and will not be introduced in detail here). The control switch 32 is electrically connected to the two electric-controlled cylinders 11. The vehicle body 1 can be moved by pushing the push-pull handle 31, and the start and stop of the two electric-controlled cylinders 11 can be controlled by the control switch 32.

[0031] A material storage box 7 is fixedly installed on the car body 1, and a discharge pipe 8 is fixedly connected to the side of the material storage box 7 at an angle. One end of the discharge pipe 8 is connected to the inside of the material storage box 7, and one end of the discharge pipe 8 passes through the mounting hole. A rectangular hole is opened on the upper surface of the discharge pipe 8, and a sealing plate 9 is slidably inserted in the rectangular hole. An elastic component for driving the sealing plate 9 to move vertically downward is provided in the mounting hole. A transmission component for driving the sealing plate 9 to move vertically upward is provided on the car body 1, and the elastic component includes two brackets 12 symmetrically fixedly installed in the mounting holes, two vertical rods 13 fixedly installed vertically on the lower surface of the brackets 12, two first telescopic springs 14 respectively mounted on the two vertical rods 13, and two connecting blocks 15 respectively slidably mounted on the two vertical rods 13, and the two ends of the first telescopic spring 14 are respectively connected to the bracket 12 and the connecting block 15, and the connecting block 15 is fixedly connected to the sealing plate 9.

[0032] The storage box 7 is filled with vegetation seeds. Since the discharge pipe 8 is installed on the storage box 7 at an angle and one end of the discharge pipe 8 is connected to the storage box 7, the seeds in the storage box 7 will enter the discharge pipe 8. Under the action of the elastic force of the first telescopic spring 14, the two connecting blocks 15 tend to move vertically downward, thereby driving the sealing plate 9 to be inserted into the holding hole. The lower end of the sealing plate 9 contacts the inner wall of the discharge pipe 8, thereby blocking the pipe mouth of the discharge pipe 8. The connecting block 15 can move up and down on the vertical rod 13. When the sealing plate 9 moves vertically upward, the first telescopic spring 14 is compressed, thereby opening the pipe mouth of the discharge pipe 8. When the first telescopic spring 14 is compressed to the maximum extent, the lower end of the sealing plate 9 is still inserted in the rectangular hole.

[0033] The transmission assembly includes a U-shaped frame 16 sleeved on the rotating rod 5, an L-shaped mounting plate 17 fixedly mounted on the U-shaped frame 16, a moving rod 18 slidably mounted on the mounting plate 17 through an elastic component, a magnet 19 fixedly mounted on the lower end of the moving rod 18 and a metal rod 20 fixedly mounted on the upper end of the sealing plate 9. A moving hole is opened on the mounting plate 17, and the moving rod 18 is vertically slidably inserted into the moving hole. The two ends of the U-shaped frame 16 are respectively fixedly connected to the two lifting blocks 3, and the magnet 19 is located directly above the metal rod 20. The elastic component includes a stopper 21 fixedly mounted on the upper end of the moving rod 18 and a second telescopic spring 22 sleeved on the moving rod 18. The second telescopic spring 22 is located above the mounting plate 17, and the two ends of the second telescopic spring 22 are respectively connected to the mounting plate 17 and the stopper 21.

[0034] The two ends of the U-shaped frame 16 are respectively fixedly connected to the two lifting blocks 3, so that the U-shaped frame 16 can be driven to move up and down by the two lifting blocks 3. The moving rod 18 is installed on the mounting plate 17 through the second telescopic spring 22. Under the support of the second telescopic spring 22, the mounting plate 17 is located in the middle part of the moving rod 18.

[0035] The elastic coefficient of the second telescopic spring 22 is greater than the elastic coefficient of the first telescopic spring 14, and the magnetic force between the magnet 19 and the metal rod 20 is greater than the elastic force of the first telescopic spring 14. When the mounting plate 17 drives the moving rod 18 to move vertically downward, the magnet 19 at the lower end of the moving rod 18 will contact the metal rod 20. Under the action of the magnetic force, the magnet 19 and the metal rod 20 are adsorbed together. In the process of rotating the hole, when the mounting plate 17 continues to move vertically downward, the moving rod 18 will move relative to the mounting plate 17. At this time, the second telescopic spring 22 is pulled up, and when the mounting plate 17 moves vertically upward, the second telescopic spring 22 will begin to recover, and then drive the metal rod 20 to move vertically upward through the moving rod 18 and the magnet 19, thereby driving the sealing plate 9 to move vertically upward, opening the pipe mouth of the discharge pipe 8, until the first telescopic spring 14 is compressed to the maximum extent, and the magnet 19 will separate from the metal rod 20.

[0036] A water tank 23 is fixedly installed on the vehicle body 1, a rectangular tube 24 is fixedly installed in the installation hole, the rectangular tube 24 and the water tank 23 are connected through a water pipe 25, a connecting pipe 26 is connected to the lower end of the rectangular tube 24, an arc tube 27 is fixedly connected to the lower end of the connecting pipe 26, a plurality of nozzles 28 are installed on the arc tube 27, the arc tube 27 is sleeved on the spiral blade 6, a water spraying assembly for spraying water is provided on the U-shaped frame 16, the water spraying assembly includes a push plate 29 sealingly and slidably installed in the rectangular tube 24 and an L-shaped push rod 30 fixedly installed on the U-shaped frame 16, one end of the push rod 30 extends into the rectangular tube 24 and is fixedly connected to the push plate 29, a first one-way valve that only allows water to flow from the water tank 23 to the rectangular tube 24 is installed in the water pipe 25, and a second one-way valve that only allows water to flow from the rectangular tube 24 to the arc tube 27 is installed in the connecting pipe 26.

[0037] The water tank 23 is filled with water, and the push plate 29 is sealed and slidably installed in the rectangular tube 24. When the U-shaped frame 16 moves up and down with the lifting block 3, the push plate 29 is driven to move up and down in the rectangular tube 24 through the push rod 30. When the push plate 29 moves upward in the rectangular tube 24, the water in the water tank 23 is sucked into the rectangular tube 24 through the water pipe 25. In the process of drilling, the U-shaped frame 16 will drive the push plate 29 to move vertically downward in the rectangular tube 24, so that the water in the rectangular tube 24 is squeezed into the arc tube 27 through the connecting pipe 26, and then sprayed out through the nozzle 28. The sprayed water will be sprayed between the spiral blade 6 and the ground. The sprayed water can play a role in dust suppression. At the same time, the sprayed water makes the ground soil moist when it contacts the ground, thereby facilitating the drilling of the spiral blade 6, and the sprayed water can provide nutrients for the seeds put in.

[0038] In the present invention, during the drilling process, the drive motor 4 is started, the spiral blade 6 is driven to rotate through the rotating rod 5, and then the two lifting blocks 3 are driven to move vertically downward through the electric control cylinder 11, thereby driving the drive motor 4, the rotating rod 5 and the spiral blade 6 to move downward, contact the ground, and drill the ground.

[0039] During the vertical downward movement of the two lifting blocks 3, the mounting plate 17 will be driven to move vertically downward through the U-shaped frame 16, and at the same time, the moving rod 18 and the magnet 19 will be driven to move toward the metal rod 20 until the magnet 19 contacts the metal rod 20. Under the action of magnetic force, the magnet 19 and the metal rod 20 are adsorbed together. During the hole turning process, the lifting block 3 continues to drive the mounting plate 17 to move vertically downward, and the moving rod 18 cannot move downward due to the obstruction of the sealing plate 9. At this time, the moving rod 18 and the mounting plate 17 move relative to each other, and the second telescopic spring 22 begins to stretch until the drilling is completed.

[0040] After the drilling is completed, the lifting block 3 drives the mounting plate 17 to move vertically upward. At this time, the second telescopic spring 22 begins to restore its original state. When the second telescopic spring 22 restores its original state, since the elastic coefficient of the second telescopic spring 22 is greater than the elastic coefficient of the first telescopic spring 14, the moving rod 18 drives the sealing plate 9 to move vertically upward through the magnet 19 and the metal rod 20, and the connecting block 15 moves up on the vertical rod 13. The first telescopic spring 14 is compressed, thereby automatically opening the nozzle of the discharge pipe 8. At this time, the seeds in the discharge pipe 8 will slide along the discharge pipe 8. The seeds in the material storage box 7 can be automatically dropped into the drilled hole by the staff, and the operation is simple, and the staff does not need to manually put seeds into the hole, which saves time and effort, effectively improves the planting efficiency, and avoids the residue phenomenon.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for restoring vegetation on engineering sites in arid river valleys, comprising a vehicle body (1), characterized in that: The vehicle body (1) is provided with a mounting hole, and a support block (2) is symmetrically fixedly mounted on the upper surface of the vehicle body (1), the mounting hole is located between two support blocks (2), and a lifting block (3) is vertically slidably mounted on the two support blocks (2) through a lifting assembly, and a driving motor (4) is fixedly mounted between the two lifting blocks (3), and a rotating rod (5) is fixedly mounted on one end of the output shaft of the driving motor (4), and one end of the rotating rod (5) passes through the mounting hole and is fixedly sleeved with a spiral blade (6); A material storage box (7) is fixedly mounted on the vehicle body (1), and a discharge pipe (8) is fixedly and obliquely connected to the side of the material storage box (7), one end of the discharge pipe (8) is connected to the interior of the material storage box (7), one end of the discharge pipe (8) passes through the mounting hole, a rectangular hole is opened on the upper surface of the discharge pipe (8), a sealing plate (9) is slidably inserted in the rectangular hole, an elastic component is arranged in the mounting hole for driving the sealing plate (9) to move vertically downward, and a transmission component for driving the sealing plate (9) to move vertically upward is arranged on the vehicle body (1).

2. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 1 is characterized in that: The lifting assembly comprises a lifting slot (10) provided on the support block (2) and an electric control cylinder (11) fixedly mounted on the upper end of the support block (2); one end of the lifting block (3) is slidably inserted into the lifting slot (10); an output end of the electric control cylinder (11) is inserted into the lifting slot (10) and is fixedly connected to the lifting block (3).

3. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 1 is characterized in that: The elastic component comprises two brackets (12) symmetrically fixedly installed in the mounting holes, two vertical rods (13) vertically fixedly installed on the lower surface of the brackets (12), two first telescopic springs (14) respectively sleeved on the two vertical rods (13) and two connecting blocks (15) respectively slidably sleeved on the two vertical rods (13), the two ends of the first telescopic spring (14) are respectively connected to the brackets (12) and the connecting blocks (15), and the connecting blocks (15) are fixedly connected to the sealing plate (9).

4. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 3 is characterized in that: The transmission assembly comprises a U-shaped frame (16) sleeved on the rotating rod (5), an L-shaped mounting plate (17) fixedly mounted on the U-shaped frame (16), a moving rod (18) slidably mounted on the mounting plate (17) via an elastic component, a magnet (19) fixedly mounted on the lower end of the moving rod (18), and a metal rod (20) fixedly mounted on the upper end of the sealing plate (9); a moving hole is provided on the mounting plate (17), and the moving rod (18) is vertically slidably inserted into the moving hole; the two ends of the U-shaped frame (16) are respectively fixedly connected to the two lifting blocks (3); and the magnet (19) is located directly above the metal rod (20).

5. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 4 is characterized in that: The elastic component comprises a stopper (21) fixedly mounted on the upper end of the moving rod (18) and a second telescopic spring (22) sleeved on the moving rod (18), wherein the second telescopic spring (22) is located above the mounting plate (17), and the two ends of the second telescopic spring (22) are respectively connected to the mounting plate (17) and the stopper (21).

6. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 5 is characterized in that: The elastic coefficient of the second telescopic spring (22) is greater than the elastic coefficient of the first telescopic spring (14), and the magnetic force between the magnet (19) and the metal rod (20) is greater than the elastic force of the first telescopic spring (14).

7. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 4 is characterized in that: A water tank (23) is fixedly mounted on the vehicle body (1), a rectangular tube (24) is fixedly mounted in the mounting hole, the rectangular tube (24) and the water tank (23) are connected via a water pipe (25), a connecting pipe (26) is connected to the lower end of the rectangular tube (24), an arc-shaped tube (27) is fixedly connected to the lower end of the connecting pipe (26), a plurality of spray heads (28) are mounted on the arc-shaped tube (27), the arc-shaped tube (27) is sleeved on the spiral blade (6), and a water spray assembly for spraying water is provided on the U-shaped frame (16).

8. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 7 is characterized in that: The water spray assembly comprises a push plate (29) sealed and slidably mounted in a rectangular tube (24) and an L-shaped push rod (30) fixedly mounted on a U-shaped frame (16); one end of the push rod (30) extends into the rectangular tube (24) and is fixedly connected to the push plate (29).

9. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 7, characterized in that: A first one-way valve is installed in the water pipe (25) and only allows water to flow from the water tank (23) into the rectangular tube (24). A second one-way valve is installed in the connecting pipe (26) and only allows water to flow from the rectangular tube (24) into the arc tube (27).

10. The vegetation restoration equipment for engineering sites in dry river valleys according to claim 2, characterized in that: A push-pull handle (31) is fixedly mounted on the vehicle body (1), and a control switch (32) for controlling two electrically controlled cylinders (11) is mounted on the push-pull handle (31), and the control switch (32) is electrically connected to the two electrically controlled cylinders (11).

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