Three-cylinder pressed cake making device

Abstract

The invention belongs to the technical field of laver processing, and provides a three-cylinder pressed cake making device which comprises a base, a plurality of sets of mounting cylinders distributed at intervals are fixedly mounted on the base, coaxially-arranged placing cylinders are rotatably mounted in the mounting cylinders, first filter plates are arranged at the lower ends of the placing cylinders, filter holes are formed in the side walls, located in the mounting cylinders, of the placing cylinders, and the filter holes are communicated with the mounting cylinders. A power assembly for driving the placing cylinder to rotate is arranged on the mounting cylinder; and a first telescopic piece fixedly mounted on the base is arranged in the mounting cylinder. Compared with the prior art, the device has the following beneficial effects that a pressing plate can conduct preliminary compression on a laver cake, then a second filter plate drives a fixing column to move upwards, part of point positions of the laver cake are pressed and fixed to the pressing plate, and a placing barrel is driven by a power assembly to rotate; under the action of centrifugal force, water in the laver can be quickly thrown out.

Description

Technical Field

[0001] The invention belongs to the technical field of laver processing, and in particular relates to a three-cylinder cake pressing and making device. Background Art

[0002] Nori is an algae belonging to the Rhodophyta. Historically, people living along the coast collected nori in natural sea areas. In addition to eating it fresh, nori is also often washed, dried, and processed into dried nori for easy preservation.

[0003] With the continuous development of the algae processing field, simply processing laver into dried laver can no longer meet people's needs. Laver is more processed into laver cakes, which are convenient for people to transport, reduce the space occupied by laver, and facilitate the preservation of laver. However, most of the existing laver cake-making devices directly press the round laver cakes during operation, so that the moisture carried by the laver cakes is difficult to be completely and quickly discharged. A large amount of moisture remains in the laver cakes, resulting in poor molding quality of the laver cakes. Summary of the invention

[0004] The purpose of the present invention is to provide a three-cylinder cake making device, aiming to solve the technical problem in the prior art that the moisture carried by the laver cake is difficult to be completely and quickly discharged, resulting in poor molding quality of the laver cake.

[0005] The present invention is implemented as follows: a three-cylinder cake pressing device comprises a base, on which a plurality of sets of spaced installation cylinders are fixedly installed, a coaxially arranged placement cylinder is rotatably installed in the installation cylinder, a first filter plate is arranged at the lower end of the placement cylinder, a filter hole is opened on the side wall of the placement cylinder located in the installation cylinder, and a power assembly for driving the placement cylinder to rotate is arranged on the installation cylinder; A first telescopic member fixedly mounted on the base is arranged in the installation cylinder, a connecting box is fixedly mounted on the output end of the first telescopic member, a plurality of connecting rings with different diameters and distributed in concentric circles are fixedly mounted on the connecting box, a surface of the connecting ring away from the base is connected with a plurality of blowing pipes, a fan for conveying gas to the connecting box is fixedly mounted in the installation cylinder, a second filter plate is arranged on the connecting box, a plurality of fixed columns distributed at intervals are fixedly mounted on the second filter plate, the fixed columns are in sliding contact with the first filter plate, the fixed columns penetrate the first filter plate, and a collecting pipe connected with the installation cylinder is arranged on the base; A bracket is fixedly mounted on the base, and a plurality of groups of second telescopic members corresponding to the positions of the installation tubes are fixedly mounted on the bracket. A pressing plate used in conjunction with the placement tube is rotatably mounted on the output end of the second telescopic member.

[0006] Further technical solution: the blowing pipe is arranged at an angle with the horizontal plane and is distributed along the radial direction of the mounting tube, and one end of the blowing pipe close to the side wall of the mounting tube is an open end.

[0007] Further technical solution: a slide rail with an annular structure is fixedly installed on the connecting box, the slide rail is coaxially arranged with the mounting tube, a plurality of support frames are arranged in the slide rail, the support frame is fixedly connected to the second filter plate, and the support frame is rollingly connected to the slide rail through balls.

[0008] Further technical solution: the pressing plate and the placing tube are coaxially arranged, and the outer diameter of the pressing plate is the same as the inner diameter of the placing tube.

[0009] Further technical solution: the first filter plate is fixedly mounted with spaced connecting posts, which extend into connecting holes provided on the side wall of the placement cylinder, and a protruding structure is provided at one end of the connecting post located in the connecting hole.

[0010] Further technical solution: A plurality of sets of elastic members are fixedly mounted on the surface of the first filter plate close to the second filter plate, and one end of the elastic member away from the first filter plate is fixedly connected to the second filter plate.

[0011] Further technical solution: The power assembly includes a rotating power part, which is fixedly mounted on the end face of the mounting tube. The output shaft axis of the rotating power part is parallel to the mounting tube. The rotating power part drives the gear to rotate, and the gear is meshed with a gear ring fixedly mounted on the placement tube. The gear ring is coaxially arranged with the placement tube.

[0012] Further technical solution: a protective cover is threadedly mounted on the mounting tube, and the rotating power part is located inside the protective cover.

[0013] Further technical solution: The pressure plate is provided with a lifting magnet ring, which is coaxially arranged with the pressure plate, and a plurality of side plates distributed in a circular array around its axis are fixedly installed on the lifting magnet ring, the side plates are in sliding contact with the pressure plate and the outer side surfaces of the side plates and the outer side surfaces of the pressure plate form a complete circular surface, and a plurality of first iron plates are fixedly installed on the pressure plate, and when the lifting magnet ring contacts the first iron plate, the bottom surface of the side plate coincides with the bottom surface of the pressure plate.

[0014] Further technical solution: a plurality of sets of third telescopic members are fixedly mounted on the bracket, a second iron plate is fixedly mounted on the output end of the third telescopic member, and the lifting magnet ring is located on the moving track of the second iron plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. After the laver cake is formed, the second telescopic member drives the pressing plate to move downward, and the pressing plate stops moving after the set distance between the pressing plate and the first filter plate is reached. At this time, the pressing plate can perform preliminary compression on the laver cake, and a small amount of water in the laver cake is squeezed out. Then the second filter plate drives the fixed column to move upward and presses some points of the laver cake tightly and fixes them on the pressing plate. At this time, the placing cylinder is driven to rotate by the power component. When the placing cylinder rotates, the first filter plate, the second filter plate and the pressing plate follow the rotation. Under the action of centrifugal force, the moisture in the laver can be quickly thrown out, reducing the water content in the laver, thereby improving the subsequent forming quality of the laver cake.

[0016] 2. During the rotation, the fan transports air into the connecting box, and the air in the connecting box enters the connecting ring, and then the air is blown out through the blowing pipe. Due to the angle setting of the blowing pipe, the blown air passes through the second filter plate and the first filter plate upward, and then blows onto the laver. Due to the closure of the upper pressure plate and the angle setting of the blowing pipe, the air will flow around, thereby accelerating the separation of moisture in the laver. Since the laver is staggered and some points are fixed, and the laver itself has a long length, when the air blows onto the laver, the unfixed part of the laver will swing and vibrate, and the laver will be twisted and deformed during the swinging and vibrating process, which can further separate the moisture wrapped in the laver, further reduce the moisture content in the laver, and improve the subsequent molding quality of the laver cake.

[0017] 3. After the laver is formed, the pressing plate moves upward a set distance. At this time, the third telescopic member drives the second iron plate to move downward. After the second iron plate contacts the lifting magnet ring, it pushes the lifting magnet ring to move downward and makes it out of contact with the first iron plate. Under the push of the second iron plate, the side plate moves downward until it contacts the first filter plate, thereby shoveling the laver cake through the side plate. After that, the power component drives the placement cylinder to rotate a set angle. At this time, the side plate can fully shovel the side wall of the placement cylinder, so that the formed laver cake is out of contact with the placement cylinder, avoiding the adhesion of the edge of the laver cake to the placement cylinder, resulting in a large amount of laver debris when it is taken out or causing the laver cake to scatter, further improving the forming quality of the laver cake. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic cross-sectional structural diagram of the installation tube in the present invention.

[0020] Figure 3 for Figure 2 A magnified schematic diagram of the A1 region in the middle.

[0021] Figure 4 for Figure 2 A magnified schematic diagram of the A2 region in the middle.

[0022] Figure 5 It is a schematic diagram of the structure of placing the cylinder in the present invention.

[0023] Figure 6 It is the front view of the connecting hole in the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the connecting ring in the present invention.

[0025] Figure 8 It is a structural schematic diagram of the pressure plate in the present invention.

[0026] In the accompanying drawings: 1. base; 2. bracket; 3. mounting cylinder; 4. placement cylinder; 5. filter hole; 6. first filter plate; 7. first telescopic member; 8. connecting box; 9. connecting ring; 10. blowing pipe; 11. slide rail; 12. support frame; 13. ball; 14. second filter plate; 15. fixing column; 16. rotating power member; 17. gear; 18. gear ring; 19. protective cover; 20. fan; 21. collecting pipe; 22. second telescopic member; 23. pressure plate; 24. lifting magnet ring; 25. side plate; 26. first iron plate; 27. third telescopic member; 28. second iron plate; 29. ​​elastic member; 30. connecting column; 31. connecting hole; 32. power assembly. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0029] like Figure 1-Figure 8 As shown, a three-cylinder cake pressing device provided by the present invention comprises a base 1, on which a plurality of groups of installation cylinders 3 are fixedly installed at intervals, a placement cylinder 4 arranged coaxially is rotatably installed in the installation cylinder 3, a first filter plate 6 is arranged at the lower end of the placement cylinder 4, and connection columns 30 arranged at intervals are fixedly installed on the first filter plate 6, the connection columns 30 extend into connection holes 31 provided on the side wall of the placement cylinder 4, a protruding structure is provided at one end of the connection column 30 located in the connection hole 31, a filter hole 5 is provided on the side wall of the placement cylinder 4 located in the installation cylinder 3, and a power assembly 32 for driving the placement cylinder 4 to rotate is provided on the installation cylinder 3; A first telescopic member 7 fixedly mounted on the base 1 is arranged in the mounting tube 3, a connecting box 8 is fixedly mounted on the output end of the first telescopic member 7, a plurality of connecting rings 9 with different diameters and distributed in concentric circles are fixedly mounted on the connecting box 8, a surface of the connecting ring 9 away from the base 1 is connected with a plurality of blowing pipes 10, the blowing pipes 10 are arranged at an angle with the horizontal plane and are distributed along the radial direction of the mounting tube 3, an end of the blowing pipe 10 close to the side wall of the mounting tube 3 is an open end, a fan 20 for conveying gas to the connecting box 8 is fixedly mounted in the mounting tube 3, a second filter plate 14 is arranged on the connecting box 8, an annular structure is fixedly mounted on the connecting box 8 The slide rail 11 of the structure is coaxially arranged with the mounting cylinder 3, and multiple groups of support frames 12 are arranged in the slide rail 11, and the support frames 12 are fixedly connected with the second filter plate 14, and the support frames 12 are rollingly connected with the slide rail 11 through the ball bearings 13, and multiple groups of fixed columns 15 distributed at intervals are fixedly installed on the second filter plate 14, and the fixed columns 15 are in sliding contact with the first filter plate 6, and the fixed columns 15 penetrate the first filter plate 6, and multiple groups of elastic members 29 are fixedly installed on the surface of the first filter plate 6 close to the second filter plate 14, and one end of the elastic member 29 away from the first filter plate 6 is fixedly connected with the second filter plate 14, and a collecting pipe 21 connected with the mounting cylinder 3 is arranged on the base 1; A bracket 2 is fixedly installed on the base 1, and a plurality of groups of second telescopic members 22 corresponding to the positions of the mounting tubes 3 are fixedly installed on the bracket 2. A pressing plate 23 used in conjunction with the placing tube 4 is rotatably installed on the output end of the second telescopic member 22. The pressing plate 23 is coaxially arranged with the placing tube 4, and the outer diameter of the pressing plate 23 is the same as the inner diameter of the placing tube 4.

[0030] In actual application of this embodiment, in the initial state, the first filter plate 6 is in close contact with the lower end of the placement tube 4, the elastic member 29 is in a compressed state, the fixing column 15 is flush with the upper surface of the first filter plate 6, and the processed moist laver is transported into the placement tube 4 to form a basic circle. After the laver cake is formed, the second telescopic member 22 drives the pressing plate 23 to move downward, and the pressing plate 23 stops moving after reaching a set distance from the first filter plate 6. At this time, the pressing plate 23 can perform preliminary compression on the laver cake, and the squeezed water flows downward through the first filter plate 6 and the filter hole 5, and finally flows out through the collecting pipe 21. A shielding plate driven to rotate by a motor is provided on the connecting box 8 to prevent water from entering the blowing pipe 10, and the shielding of the blowing pipe 10 is released during subsequent blowing; Afterwards, the first telescopic member 7 drives the connecting box 8 to move upward, and the connecting box 8 pushes the second filter plate 14 to move upward through the supporting frame 12, and the second filter plate 14 drives the fixing column 15 to move upward and presses and fixes some points of the laver cake on the pressing plate 23, and at this time, the placing cylinder 4 is driven to rotate by the power component 32, and when the placing cylinder 4 rotates, the first filter plate 6, the second filter plate 14 and the pressing plate 23 rotate accordingly, so that the water in the laver can be quickly thrown out under the action of centrifugal force, thereby reducing the water content in the laver, thereby improving the subsequent molding quality of the laver cake; At the same time, during the rotation process, the fan 20 transports air into the connecting box 8, and the air in the connecting box 8 enters the connecting ring 9, and then the air is blown out through the blowing pipe 10. Due to the angle setting of the blowing pipe 10, the blown air passes through the second filter plate 14 and the first filter plate 6 upward, and then blows onto the laver. Due to the closure of the upper pressure plate 23 and the angle setting of the blowing pipe 10, the air will flow around, thereby accelerating the separation of moisture in the laver. Since the laver is staggered and some points are fixed, and the laver itself has a long length, when the air blows onto the laver, the unfixed part of the laver will be shaken and oscillated, and the laver will be twisted and deformed during the shaking and oscillation process, which can further separate the moisture wrapped in the laver, further reduce the moisture content in the laver, and improve the subsequent molding quality of the laver cake; After dehydration is completed, the second filter plate 14 moves downward to reset the fixed column 15, and the pressing plate 23 continues to move downward to press the laver into shape. After pressing and forming, the pressing plate 23 resets, and the second filter plate 14 moves downward to release the fixed column 15 from contact with the laver. Then, when the second filter plate 14 moves in the opposite direction, the fixed column 15 lifts the formed laver cake upward, so that the laver cake is separated from the first filter plate 6, which is convenient for subsequent taking; After the laver cake is taken out, the second filter plate 14 moves away from the first filter plate 6 so that the first filter plate 6 is separated from the placement tube 4. At this time, the power assembly 32 drives the placement tube 4 to rotate, and under the action of centrifugal force, some of the remaining laver debris is separated from the gap between the placement tube 4 and the first filter plate 6, thereby realizing automatic cleaning of the placement tube 4 and the first filter plate 6. After cleaning, the first filter plate 6 is reset.

[0031] In an example of the present embodiment, the first telescopic member 7 and the second telescopic member 22 are respectively the first electric telescopic rod and the second electric telescopic rod, and of course, they can also be other components that can actively change the length, such as a hydraulic cylinder. The second filter plate 14 is driven up and down by the first electric telescopic rod, and the pressure plate 23 is driven up and down by the second electric telescopic rod.

[0032] like Figure 2 , Figure 3 As shown, a three-cylinder cake making device provided by the present invention, the power assembly 32 includes a rotating power member 16, the rotating power member 16 is fixedly mounted on the end face of the mounting cylinder 3, the output shaft axis of the rotating power member 16 is parallel to the mounting cylinder 3, the rotating power member 16 drives the gear 17 to rotate, the gear 17 is meshed with the ring gear 18 fixedly mounted on the placing cylinder 4, and the ring gear 18 is coaxially arranged with the placing cylinder 4.

[0033] Specifically, a protective cover 19 is threadedly mounted on the mounting tube 3 , and the rotating power component 16 is located inside the protective cover 19 .

[0034] In actual application of this embodiment, the rotating power member 16 drives the placing cylinder 4 to rotate through the meshing gear 17 and the ring gear 18, so as to dehydrate the laver in the placing cylinder 4, and the rotating power member 16 is shielded and protected by the protective cover 19 to avoid injuries to the staff.

[0035] In one embodiment of the present invention, the rotating power member 16 is a motor, and of course it can also be other components capable of outputting rotating power, such as a hydraulic motor, and the placement cylinder 4 is driven to rotate by the motor.

[0036] like Figure 1 , Figure 8 As shown, a three-cylinder cake making device provided by the present invention is provided with a lifting magnet ring 24 on the pressing plate 23, and the lifting magnet ring 24 is coaxially arranged with the pressing plate 23. A plurality of side plates 25 distributed in a circular array around its axis are fixedly installed on the lifting magnet ring 24, and the side plates 25 are in sliding contact with the pressing plate 23, and the outer side surfaces of the side plates 25 and the outer side surfaces of the pressing plate 23 form a complete circular surface, and a plurality of first iron plates 26 are fixedly installed on the pressing plate 23, and when the lifting magnet ring 24 is in contact with the first iron plates 26, the bottom surfaces of the side plates 25 coincide with the bottom surfaces of the pressing plate 23.

[0037] Specifically, a plurality of sets of third telescopic members 27 are fixedly mounted on the bracket 2 , a second iron plate 28 is fixedly mounted on the output end of the third telescopic member 27 , and the lifting magnet ring 24 is located on the moving track of the second iron plate 28 .

[0038] In actual application of this embodiment, when the pressing plate 23 presses and forms the laver, when the lifting magnet ring 24 contacts the first iron plate 26, the bottom surface of the side plate 25 coincides with the bottom surface of the pressing plate 23. At this time, the bottom surface of the pressing plate 23 is a complete plane structure to press and form the laver; After the laver is formed, the pressing plate 23 moves upward by a set distance. At this time, the third telescopic member 27 drives the second iron plate 28 to move downward. After the second iron plate 28 contacts the lifting magnet ring 24, it will push the lifting magnet ring 24 to move downward and make it out of contact with the first iron plate 26. Under the push of the second iron plate 28, the side plate 25 moves downward until it contacts the first filter plate 6, so that the laver cake is cut by the side plate 25. Then the power component 32 drives the placement tube 4 to rotate the set angle. At this time, the side plate 25 can fully cut the side wall of the placement tube 4, so that the formed laver cake is out of contact with the placement tube 4, avoiding the laver cake edge from sticking to the placement tube 4, resulting in a large amount of laver debris when it is taken out or causing the laver cake to spread, further improving the forming quality of the laver cake; After the scraping is completed, the third telescopic member 27 contracts to drive the lifting magnet ring 24 to move upward. When the lifting magnet ring 24 contacts the first iron plate 26 , the second iron plate 28 continues to move until it is out of contact with the lifting magnet ring 24 .

[0039] In an example of the present invention, the third telescopic member 27 is an electric telescopic rod, and of course it can also be other components that can actively change the length, such as a hydraulic cylinder, and the third telescopic member 27 drives the second iron plate 28 to move up and down.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A three-cylinder cake making device, comprising a base (1), characterized in that: The base (1) is fixedly mounted with a plurality of installation cylinders (3) arranged at intervals, a coaxially arranged placement cylinder (4) is rotatably mounted in the installation cylinder (3), a first filter plate (6) is arranged at the lower end of the placement cylinder (4), a filter hole (5) is provided on the side wall of the placement cylinder (4) located inside the installation cylinder (3), and a power assembly (32) for driving the placement cylinder (4) to rotate is arranged on the installation cylinder (3); The installation cylinder (3) is provided with a first telescopic member (7) fixedly mounted on the base (1); a connecting box (8) is fixedly mounted on the output end of the first telescopic member (7); a plurality of connecting rings (9) of different diameters and arranged in concentric circles are fixedly mounted on the connecting box (8); a surface of the connecting ring (9) away from the base (1) is connected to a plurality of blowing pipes (10); a fan (20) for conveying gas to the connecting box (8) is fixedly mounted in the installation cylinder (3); a second filter plate (14) is provided on the connecting box (8); a plurality of fixed columns (15) distributed at intervals are fixedly mounted on the second filter plate (14); the fixed columns (15) are in sliding contact with the first filter plate (6); the fixed columns (15) penetrate the first filter plate (6); and a collecting pipe (21) connected to the installation cylinder (3) is provided on the base (1); A bracket (2) is fixedly mounted on the base (1), a plurality of groups of second telescopic members (22) corresponding to the positions of the mounting cylinders (3) are fixedly mounted on the bracket (2), and a pressing plate (23) for use with the placement cylinder (4) is rotatably mounted on the output end of the second telescopic member (22).

2. A three-cylinder cake making device according to claim 1, characterized in that: The blowing pipe (10) is arranged at an angle with the horizontal plane and is distributed along the radial direction of the mounting tube (3); one end of the blowing pipe (10) close to the side wall of the mounting tube (3) is an open end.

3. A three-cylinder cake making device according to claim 1, characterized in that: A slide rail (11) of an annular structure is fixedly mounted on the connecting box (8); the slide rail (11) is coaxially arranged with the mounting tube (3); a plurality of groups of support frames (12) are arranged in the slide rail (11); the support frames (12) are fixedly connected to the second filter plate (14); and the support frames (12) are rollingly connected to the slide rail (11) via balls (13).

4. A three-cylinder cake making device according to claim 1, characterized in that: The pressing plate (23) is coaxially arranged with the placement cylinder (4), and the outer diameter of the pressing plate (23) is the same as the inner diameter of the placement cylinder (4).

5. The three-cylinder cake making device according to claim 1, characterized in that: The first filter plate (6) is fixedly mounted with spaced connection posts (30), the connection posts (30) extending into connection holes (31) provided on the side wall of the placement cylinder (4), and a protruding structure is provided at one end of the connection post (30) located in the connection hole (31).

6. A three-cylinder cake making device according to claim 5, characterized in that: A plurality of groups of elastic members (29) are fixedly mounted on a surface of the first filter plate (6) close to the second filter plate (14); one end of the elastic member (29) away from the first filter plate (6) is fixedly connected to the second filter plate (14).

7. The three-cylinder cake making device according to claim 1, characterized in that: The power assembly (32) comprises a rotating power member (16), the rotating power member (16) being fixedly mounted on the end surface of the mounting tube (3), the output shaft axis of the rotating power member (16) being parallel to the mounting tube (3), the rotating power member (16) driving a gear (17) to rotate, the gear (17) meshing with a gear ring (18) fixedly mounted on the placement tube (4), the gear ring (18) being coaxially arranged with the placement tube (4).

8. A three-cylinder cake making device according to claim 7, characterized in that: A protective cover (19) is threadedly mounted on the mounting cylinder (3), and the rotating power component (16) is located inside the protective cover (19).

9. The three-cylinder cake making device according to claim 1, characterized in that: The pressing plate (23) is provided with a lifting magnet ring (24), the lifting magnet ring (24) and the pressing plate (23) are arranged coaxially, a plurality of groups of side plates (25) are fixedly mounted on the lifting magnet ring (24) and are distributed in a circular array around the axis thereof, the side plates (25) and the pressing plate (23) are in sliding contact, and the outer side surfaces of the side plates (25) and the outer side surfaces of the pressing plate (23) form a complete circular surface, a plurality of groups of first iron plates (26) are fixedly mounted on the pressing plate (23), and when the lifting magnet ring (24) and the first iron plates (26) are in contact, the bottom surface of the side plates (25) overlaps with the bottom surface of the pressing plate (23).

10. A three-cylinder cake making device according to claim 9, characterized in that: A plurality of sets of third telescopic members (27) are fixedly mounted on the bracket (2); a second iron plate (28) is fixedly mounted on the output end of the third telescopic member (27); and the lifting magnet ring (24) is located on the moving track of the second iron plate (28).

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