Homogenizing equipment for dispersing and diluting flocculant solution

Abstract

The invention discloses homogenizing equipment for dispersing and diluting a flocculating agent solution. The homogenizing equipment comprises a base and vertical frames fixedly mounted at the two ends of the top of the base, and a homogenizing equipment shell used for dispersing and diluting the flocculating agent solution is movably connected between the two vertical frames. According to the homogenizing equipment disclosed by the invention, the whole swinging of the shell of the homogenizing equipment and the alternate stirring of the stirring rod, the U-shaped stirring frame, the stirring rod and the vibrating reed can be simultaneously matched, so that a flocculating agent solution can be dispersed and diluted more sufficiently and uniformly, and the final homogenizing effect of the solution is better; the problems that a flocculating agent solution and a diluting medium are dispersed insufficiently and flocculating agent molecules are micelled or agglomerated due to the fact that a single stirring and dispersing structure is mostly adopted in existing homogenizing equipment are solved, the utilization rate of the flocculating agent is increased, the uniformity of subsequent flocculation reaction is guaranteed, and the flocculation reaction efficiency is improved. And the use requirements of people are greatly met.

Description

Technical Field

[0001] This invention relates to the field of homogenization equipment technology, and more particularly to a homogenization device for dispersing and diluting flocculant solutions. Background Technology

[0002] In water treatment, the dispersion and homogenization of flocculants are crucial for ensuring effective subsequent treatment. Flocculants typically need to be prepared into a solution of a certain concentration before being dispersed and diluted to achieve uniform mixing with the medium to be treated (such as wastewater). Through the adsorption and bridging effects of the flocculant, suspended particles are agglomerated and settled, thereby achieving the purification purpose.

[0003] However, existing homogenization equipment for dispersing and diluting flocculant solutions often uses a single agitator or static mixer to achieve dilution and dispersion. The initial contact between the flocculant solution and the dilution medium is localized and concentrated, which easily leads to flocculant molecules failing to fully expand before rapidly agglomerating, forming "clumps" or "agglomerates." This not only reduces the effective utilization rate of the flocculant but also affects the uniformity of subsequent flocculation reactions, resulting in poor treatment performance. Therefore, this invention proposes a homogenization device for dispersing and diluting flocculant solutions. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a homogenization device for dispersing and diluting flocculant solutions.

[0005] This invention proposes a homogenizing device for dispersing and diluting flocculant solutions, comprising a base and uprights fixedly installed at both ends of the top of the base. A homogenizing device housing for dispersing and diluting the flocculant solution is movably connected between the two uprights. A mounting shell is fixedly installed on the top of the homogenizing device housing. A bidirectional rotating mechanism is provided inside the mounting shell. A vertically arranged rotating rod and a rotating tube are rotatably installed inside the mounting shell through the bidirectional rotating mechanism. Both the rotating rod and the rotating tube rotate through the homogenizing device housing, and the bottom end of the rotating rod passes through the bottom of the rotating tube and is fixedly connected to multiple stirring rods. A U-shaped stirring frame is fixedly sleeved at the bottom end of the rotating tube. A stirring rod is fixedly connected to the inner side of the U-shaped stirring frame, and a vibrating plate is fixedly installed on the outer side of the U-shaped stirring frame.

[0006] Both sides of the homogenizing equipment housing are fixedly connected to swing shafts, and both uprights are equipped with swing mechanisms. The uprights drive the swing shafts and the homogenizing equipment housing to swing back and forth in the front-to-back direction through the swing mechanisms. A feeding port is provided at the top right end of the homogenizing equipment housing, and a discharge port is provided at the bottom center of the homogenizing equipment housing. Both the feeding port and the discharge port are equipped with sealing caps.

[0007] As a further preferred embodiment of the present invention, the bidirectional gear mechanism includes an upper rack disposed within the mounting housing and a lower rack disposed below the upper rack; the right ends of the upper rack and the lower rack are slidably mounted within the mounting housing via sliding brackets; an upper gear is fixedly sleeved at the top of the rotating rod, and the upper gear meshes with the upper rack for transmission; a lower gear is fixedly sleeved at the top of the rotating tube, and the lower gear meshes with the lower rack for transmission; a horizontally arranged electric telescopic cylinder is fixedly mounted on the inner left side of the mounting housing, and a horizontal rack is fixedly connected to the output end of the electric telescopic cylinder; a spur gear meshes with the lower side of the horizontal rack, and a rotating shaft is fixedly sleeved on the spur gear. The rotating shaft is rotatably mounted in the mounting housing via a rotating seat. A swing frame is provided on the rear side of the horizontal rack, and the swing frame is fixedly sleeved on the rotating shaft. A first sliding groove is provided on the top of the swing frame, and a first sliding pin is slidably connected in the first sliding groove. A first rotating connecting rod is fixedly connected to the rear end of the first sliding pin, and the other end of the first rotating connecting rod is rotatably connected to the left end of the upper rack. A second sliding groove is provided on the bottom of the swing frame, and a second sliding pin is slidably connected in the second sliding groove. A second rotating connecting rod is fixedly connected to the rear end of the second sliding pin, and the other end of the second rotating connecting rod is rotatably connected to the left end of the lower rack.

[0008] As a further preferred embodiment of the present invention, the sliding frame is provided with a guide slider, and the top inner wall and bottom inner wall of the mounting shell are both provided with guide rails, and the guide slider is slidably mounted on the guide rails in the horizontal direction.

[0009] As a further preferred embodiment of the present invention, the swing mechanism includes mounting cavities respectively provided on two uprights, a lifting block is movably mounted in the mounting cavity, a vertical rack is fixedly connected to the top of the lifting block, the outer end of the swing shaft is rotatably mounted in the mounting cavity, a transmission gear is fixedly sleeved on the swing shaft, and the vertical rack meshes with the transmission gear; a drive motor is mounted on the outer side of the uprights, the output shaft of the drive motor rotates through the mounting cavity and is fixedly sleeved with a cam, and the cam is rollingly connected to the bottom side of the lifting block.

[0010] As a further preferred embodiment of the present invention, a return spring is fixedly connected between the top end of the vertical rack and the inner wall of the top side of the mounting cavity.

[0011] As a further preferred embodiment of the present invention, a rotating bracket is also fixedly disposed inside the mounting cavity, and the end of the output shaft of the drive motor is rotatably mounted on the rotating bracket.

[0012] As a further preferred embodiment of the present invention, a vertical slider is fixedly provided on the outer side of the lifting block, and a groove is provided on the inner wall of the outer side of the mounting cavity, and the vertical slider is slidably installed in the groove in the vertical direction.

[0013] As a further preferred embodiment of the present invention, the stirring rod and stirring bar are arranged alternately in layers; a bearing is fixedly installed on the top inner wall of the homogenizing equipment shell through a mounting hole, and the rotating tube is rotatably installed on the bearing; a controller is provided on the right outer side of the upright frame, and the controller is electrically connected to the drive motor and the electric telescopic cylinder respectively.

[0014] The beneficial effects of this invention are:

[0015] 1. In this invention, by setting a bidirectional rotating mechanism, not only can the rotating rod and the stirring rod rotate, thereby stirring, dispersing and diluting the flocculant solution; it can also rotate the rotating tube, the U-shaped stirring frame, the stirring rod and the vibrating plate, thereby further stirring, dispersing and diluting the flocculant solution; and the U-shaped stirring frame, the stirring rod and the vibrating plate and the stirring rod are rotating in opposite directions to stir and disperse the flocculant solution, so that the flocculant solution in different positions in the homogenizing equipment shell can be fully exchanged and dispersed, thereby making the homogenization effect better.

[0016] 2. In this invention, by setting up a swing mechanism, the homogenizing equipment shell can swing back and forth around the swing axis. In this way, the reciprocating swing of the homogenizing equipment shell can further promote the dilution and dispersion of flocculant solution at different positions inside the homogenizing equipment shell.

[0017] 3. In this invention, the oscillation of the entire homogenizing equipment shell and the alternating stirring of the stirring rod, U-shaped stirring frame, stirring bar, and vibrating plate can work together simultaneously, thereby enabling more thorough and uniform dispersion and dilution of the flocculant solution. This ensures a better final homogenization effect and avoids the situation where previous homogenizing equipment, which often used a single stirring and dispersion structure, resulted in insufficient dispersion between the flocculant solution and the dilution medium, and was prone to causing the flocculant molecules to form "clumps" or "agglomerates". This not only improves the utilization rate of flocculant but also ensures the uniformity of subsequent flocculation reactions, greatly meeting people's needs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a homogenizing device for dispersing and diluting flocculant solutions proposed in this invention;

[0019] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0020] Figure 3 This is a schematic diagram showing a partial detail of the present invention;

[0021] Figure 4 For the present invention Figure 3 Enlarged structural diagram of section A;

[0022] Figure 5For the present invention Figure 2 Enlarged structural diagram of part B.

[0023] In the diagram: 1. Base; 2. Stand; 201. Mounting cavity; 202. Rotating bracket; 3. Homogenizer housing; 301. Feed port; 302. Discharge port; 4. Mounting shell; 5. Electric telescopic cylinder; 6. Horizontal rack; 7. Circular gear; 8. Rotating shaft; 9. Swing frame; 901. First sliding groove; 902. Second sliding groove; 10. First sliding pin; 11. First rotating connecting rod; 12. Upper rack; 13. Upper gear; 14. Rotating rod; 141. Stirring rod; 15. Second sliding pin; 16. Second rotating connecting rod; 17. Lower rack; 18. Lower gear; 19. Rotating tube; 191. U-shaped stirring frame; 192. Stirring rod; 193. Vibrating plate; 20. Sliding frame; 21. Bearing; 22. Drive motor; 23. Cam; 24. Lifting block; 25. Vertical rack; 26. Transmission gear; 27. Swing shaft; 28. Return spring; 29. ​​Vertical slider; 30. Controller. Detailed Implementation

[0024] The present invention will be further explained below with reference to specific embodiments.

[0025] Example

[0026] refer to Figure 1-5 This embodiment proposes a homogenizing device for dispersing and diluting flocculant solutions, including a base 1 and uprights 2 fixedly installed at both ends of the top of the base 1. A homogenizing device housing 3 for dispersing and diluting the flocculant solution is movably connected between the two uprights 2. A mounting shell 4 is fixedly installed on the top of the homogenizing device housing 3. A bidirectional rotating mechanism is provided inside the mounting shell 4. A vertically arranged rotating rod 14 and a rotating tube 19 are rotatably installed inside the mounting shell 4 through the bidirectional rotating mechanism. Both the rotating rod 14 and the rotating tube 19 rotate through the homogenizing device housing 3, and the bottom end of the rotating rod 14 passes through the bottom of the rotating tube 19 and is fixedly connected to multiple stirring rods. 141; A U-shaped stirring frame 191 is fixedly sleeved at the bottom end of the rotating tube 19, a stirring rod 192 is fixedly connected to the inner side of the U-shaped stirring frame 191, and a vibrating plate 193 is fixedly installed on the outer side of the U-shaped stirring frame 191; a swing shaft 27 is fixedly connected to both sides of the homogenizing equipment shell 3, and a swing mechanism is provided on both uprights 2, and the uprights 2 drive the swing shaft 27 and the homogenizing equipment shell 3 to swing back and forth in the front and back direction through the swing mechanism; a feeding port 301 is provided at the top right end of the homogenizing equipment shell 3, and a discharge port 302 is provided at the bottom center of the homogenizing equipment shell 3, and a sealing cap is provided on both the feeding port 301 and the discharge port 302.

[0027] In this embodiment, the bidirectional gear mechanism includes an upper rack 12 disposed within the mounting housing 4 and a lower rack 17 disposed below the upper rack 12; the right ends of the upper rack 12 and the lower rack 17 are slidably mounted within the mounting housing 4 via sliding frames 20; an upper gear 13 is fixedly sleeved at the top of the rotating rod 14, and the upper gear 13 meshes with the upper rack 12 for transmission; a lower gear 18 is fixedly sleeved at the top of the rotating tube 19, and the lower gear 18 meshes with the lower rack 17 for transmission; a horizontally arranged electric telescopic cylinder 5 is fixedly mounted on the inner left side of the mounting housing 4, and a horizontal rack 6 is fixedly connected to the output end of the electric telescopic cylinder 5; a spur gear 7 meshes with the lower side of the horizontal rack 6; a rotating shaft 8 is fixedly sleeved on the spur gear 7, and the rotating shaft... The rack 8 is rotatably mounted in the mounting housing 4 via a rotating seat. A swing frame 9 is provided on the rear side of the horizontal rack 6, and the swing frame 9 is fixedly sleeved on the rotating shaft 8. A first sliding groove 901 is provided on the top of the swing frame 9, and a first sliding pin 10 is slidably connected in the first sliding groove 901. A first rotating connecting rod 11 is fixedly connected to the rear end of the first sliding pin 10, and the other end of the first rotating connecting rod 11 is rotatably connected to the left end of the upper rack 12. A second sliding groove 902 is provided on the bottom of the swing frame 9, and a second sliding pin 15 is slidably connected in the second sliding groove 902. A second rotating connecting rod 16 is fixedly connected to the rear end of the second sliding pin 15, and the other end of the second rotating connecting rod 16 is rotatably connected to the left end of the lower rack 17.

[0028] The sliding frame 20 is equipped with a guide slider, and the top inner wall and bottom inner wall of the mounting shell 4 are equipped with guide rails. The guide slider is slidably mounted on the guide rails in the horizontal direction.

[0029] In this embodiment, the swing mechanism includes mounting cavities 201 respectively provided on two uprights 2. A lifting block 24 is movably mounted in the mounting cavity 201. A vertical rack 25 is fixedly connected to the top of the lifting block 24. The outer end of the swing shaft 27 is rotatably mounted in the mounting cavity 201. A transmission gear 26 is fixedly sleeved on the swing shaft 27. The vertical rack 25 meshes with the transmission gear 26. A drive motor 22 is mounted on the outside of the uprights 2. The output shaft of the drive motor 22 rotates through the mounting cavity 201 and is fixedly sleeved with a cam 23. The cam 23 is rollingly connected to the bottom side of the lifting block 24.

[0030] A return spring 28 is fixedly connected between the top end of the vertical rack 25 and the inner wall of the top side of the mounting cavity 201; a rotating bracket 202 is also fixedly installed inside the mounting cavity 201, and the end of the output shaft of the drive motor 22 is rotatably mounted on the rotating bracket 202; a vertical slider 29 is fixedly installed on the outer side of the lifting block 24, and a groove is provided on the inner wall of the outer side of the mounting cavity 201, and the vertical slider 29 is slidably installed in the groove in the vertical direction.

[0031] The stirring rods 141 and 192 are arranged alternately in layers; a bearing 21 is fixedly installed on the top inner wall of the homogenizing equipment shell 3 through a mounting hole, and the rotating tube 19 is rotatably installed on the bearing 21; a controller 30 is provided on the right outer side of the upright frame 2, and the controller 30 is electrically connected to the drive motor 22 and the electric telescopic cylinder 5 respectively.

[0032] like Figure 1-5 The homogenizing device shown is for dispersing and diluting flocculant solutions. When the flocculant solution inside the homogenizing device housing 3 needs to be dispersed and diluted: the electric telescopic cylinder 5 in the bidirectional wheel mechanism extends and retracts, driving the horizontal rack 6 to move left and right and mesh with the spur gear 7. When the spur gear 7 rotates, it drives the rotating shaft 8 to rotate in both directions, thereby driving the swing frame 9 to swing left and right around the rotating shaft 8. When swinging, the swing frame 9 slides with the first sliding pin 10 through the first sliding groove 901, and drives the upper rack 12 to move left and right through the first rotating connecting rod 11. When the upper rack 12 moves, it meshes with the upper gear 13, which in turn drives the rotating rod 14 and the stirring rod 141 to rotate. Thus, the rotation of the stirring rod 141 can stir, disperse, and dilute the flocculant solution. At the same time, when swinging, the swing frame 9 also slides with the second sliding pin 15 through the second sliding groove 902, thereby driving the lower rack 17 to move left and right through the second rotating connecting rod 16. The upper rack 17 meshes with the lower gear 18, thereby driving the rotating tube 19, the U-shaped stirring frame 191, the stirring rod 192, and the vibrating plate 193 to rotate. This rotation of the U-shaped stirring frame 191, the stirring rod 192, and the vibrating plate 193 further stirs, disperses, and dilutes the flocculant solution. Furthermore, during the left-right oscillation of the swing frame 9 based on the rotating shaft 8, its upper rack 12 and lower rack 17 alternate left and right movements, allowing the upper gear 13 and lower gear 18 to alternate forward and reverse directions. The rotation of the stirring rod 141 causes the rotation of the U-shaped stirring frame 191, the stirring rod 192, and the vibrating plate 193 to alternate. This allows the U-shaped stirring frame 191, the stirring rod 192, and the vibrating plate 193 to stir and disperse the flocculant solution in alternating opposite rotation directions with the stirring rod 141. This enables the flocculant solution in different locations within the homogenizing equipment shell 3 to be fully exchanged and dispersed in opposite directions, resulting in better homogenization.

[0033] At the same time, the drive motor 22 in the swing mechanism can be used to drive the cam 23 to rotate, which can make the lifting block 24 and the vertical rack 25 move up and down. At the same time, the return spring 28 plays a reset role. When the vertical rack 25 moves up and down, it meshes with the transmission gear 26 to drive the swing shaft 27 to rotate forward and backward, and then drive the homogenizing equipment housing 3 to swing back and forth based on the swing shaft 27 as the center. In this way, the reciprocating swing of the homogenizing equipment housing 3 can further promote the dilution and dispersion of the flocculant solution at different positions in the homogenizing equipment housing 3. Furthermore, the simultaneous oscillation of the homogenizing equipment housing 3 and the alternating stirring of the stirring rod 141, U-shaped stirring frame 191, stirring rod 192, and vibrating plate 193 can achieve a more thorough and uniform dispersion and dilution of the flocculant solution, ensuring a better final homogenization effect. This avoids the situation where previous homogenizing equipment, which often used a single stirring and dispersion structure, resulted in insufficient dispersion between the flocculant solution and the dilution medium, and was prone to causing the flocculant molecules to form "clumps" or "agglomerates." This not only improves the utilization rate of the flocculant but also ensures the uniformity of the subsequent flocculation reaction, greatly meeting people's usage needs.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A homogenizing apparatus for dispersing a dilute flocculant solution, characterized by, The utility model relates to a flocculating agent solution dilution device, including base (1), the vertical frame (2) of fixed installation in the top both ends of base (1), two vertical frame (2) between the movable joint have the homogenization equipment casing (3) for carrying out dispersion dilution to flocculating agent solution, the top of homogenization equipment casing (3) is fixedly arranged with installation shell (4), is equipped with two -way wheel mechanism in installation shell (4), and the vertically arranged rotating rod (14) and rotating pipe (19) are rotatably installed in installation shell (4) through two -way wheel mechanism respectively, and rotating rod (14) and rotating pipe (19) all rotate and penetrate to homogenization equipment casing (3) inside, and the bottom of rotating rod (14) penetrates to the below of rotating pipe (19) and is fixedly connected with a plurality of stirring rod (141), and the bottom of rotating pipe (19) is fixedly sleeved with U -shaped stirring frame (191), and the inboard of U -shaped stirring frame (191) is fixedly connected with stirring rod (192), and the outside of U -shaped stirring frame (191) is fixedly arranged with vibration plate (193), The utility model relates to a flocculating agent solution dilution device, including base (1), the vertical frame (2) of fixed installation in the top both ends of base (1), two vertical frame (2) between the movable joint have the homogenization equipment casing (3) for carrying out dispersion dilution to flocculating agent solution, the top of homogenization equipment casing (3) is fixedly arranged with installation shell (4), is equipped with two -way wheel mechanism in installation shell (4), and the vertically arranged rotating rod (14) and rotating pipe (19) are rotatably installed in installation shell (4) through two -way wheel mechanism respectively, and rotating rod (14) and rotating pipe (19) all rotate and penetrate to homogenization equipment casing (3) inside, and the bottom of rotating rod (14) penetrates to the below of rotating pipe (19) and is fixedly connected with a plurality of stirring rod (141), and the bottom of rotating pipe (19) is fixedly sleeved with U -shaped stirring frame (191), and the inboard of U -shaped stirring frame (191) is fixedly connected with stirring rod (192), and the outside of U -shaped stirring frame (191) is fixedly arranged with vibration plate (193), 2. A homogenizing device for dispersing and diluting a flocculant solution according to claim 1, characterized in that, The bidirectional wheel driving mechanism comprises an upper rack (12) arranged in the mounting shell (4) and a lower rack (17) arranged below the upper rack (12); the right ends of the upper rack (12) and the lower rack (17) are respectively slidably arranged in the mounting shell (4) through sliding frames (20); the top end of a rotating rod (14) is fixedly sleeved with an upper gear (13), the upper gear (13) is in meshing transmission with the upper rack (12); the top of a rotating pipe (19) is fixedly sleeved with a lower gear (18), the lower gear (18) is in meshing transmission with the lower rack (17); a horizontally arranged electric telescopic cylinder (5) is fixedly arranged on the left inner wall of the mounting shell (4), the output end of the electric telescopic cylinder (5) is fixedly connected with a horizontal rack (6), the lower side of the horizontal rack (6) is meshed with a circular gear (7), the circular gear (7) is fixedly sleeved with a rotating shaft (8), and the rotating shaft (8) is rotatably arranged in the mounting shell (4) through a rotating seat, the rear side of the horizontal rack (6) is provided with a swing frame (9), and the swing frame (9) is fixedly sleeved on the rotating shaft (8); the top of the swing frame (9) is provided with a first sliding groove (901), the first sliding groove (901) is slidably connected with a first sliding pin (10), the rear end of the first sliding pin (10) is fixedly connected with a first rotating connecting rod (11), and the other end of the first rotating connecting rod (11) is rotatably connected with the left end of the upper rack (12); the bottom of the swing frame (9) is provided with a second sliding groove (902), the second sliding groove (902) is slidably connected with a second sliding pin (15), the rear end of the second sliding pin (15) is fixedly connected with a second rotating connecting rod (16), and the other end of the second rotating connecting rod (16) is rotatably connected with the left end of the lower rack (17).

3. A homogenizing device for dispersing and diluting a flocculant solution according to claim 2, characterized in that, The sliding frames (20) are provided with guide sliding blocks, the top inner wall and the bottom inner wall of the mounting shell (4) are provided with guide sliding rails, and the guide sliding blocks are slidably arranged on the guide sliding rails in the horizontal direction.

4. The homogenizing apparatus for dispersing and diluting a flocculant solution according to claim 1, characterized by The swing mechanism comprises mounting cavities (201) arranged on the two stands (2) respectively, a lifting block (24) movably arranged in the mounting cavity (201), a vertical rack (25) fixedly connected to the top of the lifting block (24), a swing shaft (27) rotatably arranged in the mounting cavity (201), a transmission gear (26) fixedly sleeved on the swing shaft (27), and the vertical rack (25) in meshing transmission with the transmission gear (26); a driving motor (22) is arranged on the outer side of the stand (2), the output shaft of the driving motor (22) is rotatably arranged in the mounting cavity (201) and fixedly sleeved with a cam (23), and the cam (23) is rollingly connected to the bottom side of the lifting block (24).

5. A homogenizing device for dispersing dilute flocculant solutions according to claim 4, characterized in that A reset spring (28) is fixedly connected between the top end of the vertical rack (25) and the top inner wall of the mounting cavity (201).

6. A homogenizing apparatus for dispersing and diluting a flocculant solution according to claim 4, wherein A rotating support (202) is further fixedly arranged in the mounting cavity (201), and the end of the output shaft of the driving motor (22) is rotatably arranged on the rotating support (202).

7. A homogenizing apparatus for dispersing dilute flocculant solutions according to claim 4, wherein The outer side of the lifting block (24) is fixedly provided with a vertical sliding block (29), and a sliding groove is arranged on the outer side inner wall of the mounting cavity (201). The vertical sliding block (29) is slidingly installed in the sliding groove in the vertical direction.

8. A homogenizing apparatus for dispersing and diluting a flocculant solution according to claim 1, wherein The stirring rod (141) and the stirring rod (192) are alternately arranged in layers in the up-down direction. A bearing (21) is fixedly installed on the top inner wall of the homogenizing device shell (3) through a mounting hole. The rotating pipe (19) is rotatably installed on the bearing (21). A controller (30) is arranged on the right outer side of the stand (2). The controller (30) is electrically connected with the driving motor (22) and the electric telescopic cylinder (5) in an electric control mode.

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