Fence capable of being rotationally adjusted

Abstract

The utility model discloses a rotatable adjustable fence, which relates to the technical field of fences and comprises a positioning seat, a rotating mechanism is fixedly connected to the upper end of the positioning seat, telescopic mechanisms are fixedly connected to the left side and the right side of the upper end of the rotating mechanism, and a universal wheel is fixedly connected to the middle of the bottom end of the telescopic mechanism on the left side. The opposite faces of the two telescopic mechanisms are jointly and fixedly connected with a cross beam, a plurality of stand columns are fixedly connected to the middle of the cross beam, and each stand column comprises an inner pipe. According to the fence capable of being rotationally adjusted, the direction of the rope is changed through the fixed pulley, the rope is connected with different telescopic joints, when the fourth telescopic joint is pushed through the second air cylinder, the rope pulls other telescopic joints, linkage stretching and retracting of the multiple telescopic joints are achieved, and stability and synchronism of height adjustment of the fence are guaranteed; the first air cylinder pushes the sliding block to move, the sliding block drives the rack to move, the rack is meshed with the gear, and therefore the fixing base and the fence are driven to rotate around the gear, and the rotation angle is accurately controlled.

Description

Technical Field

[0001] This utility model belongs to the field of fence technology, and in particular relates to a rotatable and adjustable fence. Background Technology

[0002] Fences are commonly used for isolation, area demarcation, and area protection. Today, fences appear in various forms in our lives and have a wide range of uses and connotations. Fences can be divided into industrial fences, agricultural fences, civil fences, and public facility fences, etc.

[0003] Chinese patent document CN107227886B discloses a fence, which includes an upper fence beam, a lower fence beam, and multiple uprights connecting the upper and lower fence beams. Each upright is fitted with an outer sleeve to protect it. This invention has a simple structure, is easy to use and install, has good weather resistance, and is aesthetically pleasing.

[0004] The existing technology has the following problems:

[0005] 1. The fence stands on the ground with poles, but it cannot automatically adjust its angle, resulting in poor performance.

[0006] 2. The fence is connected by horizontal beams and multiple vertical poles, but it cannot automatically adjust its height, making it impractical. Utility Model Content

[0007] This invention provides a rotatable and adjustable fence to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A rotatable and adjustable fence includes a positioning seat, a rotating mechanism fixedly connected to the upper end of the positioning seat, telescopic mechanisms fixedly connected to the left and right sides of the upper end of the rotating mechanism, a caster wheel fixedly connected to the middle of the bottom end of the left telescopic mechanism, a crossbeam fixedly connected to the opposite surfaces of the two telescopic mechanisms, and several uprights fixedly connected to the middle of the crossbeam.

[0010] The column includes an inner tube, a first telescopic tube is movably sleeved at the bottom of the outer surface of the inner tube, a second telescopic tube is movably sleeved at the bottom of the outer surface of the first telescopic tube, and an outer tube is movably sleeved at the bottom of the outer surface of the second telescopic tube.

[0011] Preferably, the telescopic mechanism includes a second cylinder, a connecting plate fixedly connected to the upper end of the cylinder body, a fourth fixed pulley rotatably connected to the middle of the right side of the upper surface of the connecting plate, a fourth telescopic joint fixedly connected to the output end of the second cylinder, a third telescopic joint movably sleeved on the upper side of the lower surface of the fourth telescopic joint located on the left side, a second telescopic joint movably sleeved on the upper side of the interior of the fourth telescopic joint, a first telescopic joint movably sleeved on the upper side of the interior of the third telescopic joint, a first fixed pulley rotatably connected to the middle of the upper left side of the interior of the second telescopic joint, a second fixed pulley rotatably connected to the middle of the lower left side of the interior of the second telescopic joint, a third fixed pulley rotatably connected to the middle of the right side of the bottom end of the third telescopic joint, and a first rope fixedly connected to the middle of the lower end of the interior of the fourth telescopic joint. The upper part overlaps with the upper part of the outer surface of the fourth fixed pulley, and the first rope passes through the bottom end of the third telescopic section and the connecting plate. The end of the first rope near the connecting plate is fixedly connected to the middle of the lower end of the second telescopic section. The middle of the upper right side of the inside of the fourth telescopic section is fixedly connected to the second rope. The lower part of the outer surface of the second rope overlaps with the lower part of the outer surface of the third fixed pulley. The end of the second rope near the second cylinder is fixedly connected to the middle of the right side of the bottom end of the second telescopic section. The left side of the bottom end of the connecting plate is fixedly connected to the third rope. The lower part of the outer surface of the third rope overlaps with the lower part of the outer surface of the second fixed pulley. The end of the third rope away from the connecting plate is fixedly connected to the middle of the left side of the bottom end of the first telescopic section. The middle of the lower left side of the inside of the third telescopic section is fixedly connected to the fourth rope. The upper part of the outer surface of the fourth rope overlaps with the upper part of the outer surface of the first fixed pulley. The end of the fourth rope near the connecting plate is fixedly connected to the middle of the left side of the bottom of the first telescopic section.

[0012] Preferably, the crossbeam includes a first crossbeam, a second crossbeam, a third crossbeam, and a fourth crossbeam. The left and right ends of the first crossbeam are fixedly connected to the middle of the opposite surfaces of two first telescopic joints. The bottom end of the first crossbeam is fixedly connected to the upper ends of several inner tubes in a left-right direction. The bottom end of the second crossbeam is fixedly connected to the upper ends of several first telescopic tubes in a left-right direction. The left and right ends of the second crossbeam are fixedly connected to the upper sides of the opposite surfaces of two second telescopic joints. The interior of the second crossbeam is movably sleeved with the bottom of the outer surface of several inner tubes. The bottom end of the third crossbeam is fixedly connected to the upper ends of several second telescopic tubes in a left-right direction. The left and right ends of the third crossbeam are fixedly connected to the upper sides of the opposite surfaces of two third telescopic joints. The interior of the third crossbeam is movably sleeved with the bottom of the outer surface of several first telescopic tubes. The upper end of the fourth crossbeam is fixedly connected to the bottom ends of several outer tubes in a left-right direction. The left and right ends of the fourth crossbeam are fixedly connected to the middle of the opposite surfaces of the fourth telescopic joint.

[0013] Preferably, the rotating mechanism includes a fixed base, the upper surface of which is fixedly connected to the left and right sides of the upper surface of the fixed base and the bottom ends of the two fourth telescopic sections that are close to each other. A fixed rod is rotatably connected to the middle of the right side of the bottom end of the fixed base. A gear is fixedly connected to the middle of the outer surface of the fixed rod. The bottom end of the fixed rod is fixedly connected to the middle of the upper surface of the positioning seat. A connecting rod is fixedly connected to the middle of the right side of the bottom end of the fixed base. A first cylinder is fixedly connected to the bottom of the outer surface of the connecting rod. A slider is fixedly connected to the output end of the first cylinder. A rack is fixedly connected to the rear end of the slider. The front end of the outer surface of the rack meshes with the outer surface of the gear.

[0014] Preferably, the front part of the outer surface of the inner tube, the first telescopic tube and the second telescopic tube are all provided with wedge-shaped grooves, and the front part of the inner surface of the outer tube is fixedly connected with a wedge-shaped protrusion.

[0015] Preferably, a rectangular groove is formed in the middle of the bottom end of the first expansion joint, and a through groove is formed on the right side of the bottom end of the second expansion joint.

[0016] Preferably, a slide rail is fixedly connected to the left side of the bottom end of the fixed base, and the top of the slider is slidably connected to the inner surface of the slide rail.

[0017] Compared with existing technologies, the advantages of this utility model are:

[0018] 1. This utility model provides a rotatable and adjustable fence. The direction of the rope is changed by a fixed pulley. The rope is connected to different telescopic joints. When the fourth telescopic joint is pushed by the second cylinder, the rope pulls the other telescopic joints, realizing the linkage extension and retraction of multiple telescopic joints and ensuring the stability and synchronicity of the fence height adjustment.

[0019] 2. This utility model provides a rotatable and adjustable fence. A first cylinder pushes a slider to move, which in turn drives a rack to move. The rack meshes with a gear, thereby causing the fixed base and the fence to rotate around the gear, and the rotation angle can be precisely controlled. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a half-sectional schematic diagram of the telescopic mechanism of this utility model;

[0022] Figure 3 This is a partially enlarged schematic diagram of the telescopic mechanism of this utility model;

[0023] Figure 4 This is a partially enlarged schematic diagram of the telescopic mechanism of this utility model;

[0024] Figure 5This is a schematic diagram of the beam and column structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the rotating mechanism of this utility model.

[0026] In the diagram: 1. Crossbeam; 2. Column; 3. Rotating mechanism; 4. Caster wheel; 5. Telescopic mechanism; 6. Positioning seat; 11. First crossbeam; 12. Second crossbeam; 13. Third crossbeam; 14. Fourth crossbeam; 21. Inner tube; 22. First telescopic tube; 23. Second telescopic tube; 24. Outer tube; 241. Wedge-shaped protrusion; 25. Wedge-shaped groove; 31. First cylinder; 32. Gear; 33. Fixing rod; 34. Fixing seat; 341. Connecting rod; 34 2. Slide rail; 35. Slider; 36. Rack; 51. First telescopic joint; 511. Rectangular groove; 52. Second telescopic joint; 521. First fixed pulley; 522. Second fixed pulley; 523. Through groove; 53. Third telescopic joint; 531. Third fixed pulley; 54. Fourth telescopic joint; 55. Second cylinder; 551. Fourth fixed pulley; 552. Connecting plate; 56. First rope; 57. Second rope; 58. Third rope; 59. Fourth rope. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1 As shown, a rotatable and adjustable fence includes a positioning seat 6, a rotating mechanism 3 is fixedly connected to the upper end of the positioning seat 6, telescopic mechanisms 5 are fixedly connected to the left and right sides of the upper end of the rotating mechanism 3, a caster wheel 4 is fixedly connected to the middle of the bottom end of the left telescopic mechanism 5, a crossbeam 1 is fixedly connected to the opposite surfaces of the two telescopic mechanisms 5, and several uprights 2 are fixedly connected to the middle of the crossbeam 1.

[0029] The column 2 includes an inner tube 21, a first telescopic tube 22 is movably sleeved at the bottom of the outer surface of the inner tube 21, a second telescopic tube 23 is movably sleeved at the bottom of the outer surface of the first telescopic tube 22, and an outer tube 24 is movably sleeved at the bottom of the outer surface of the second telescopic tube 23.

[0030] It should be noted that the fence rotates around the positioning seat 6 following the rotating mechanism 3. The cooperation between the inner tube 21, the first telescopic tube 22, the second telescopic tube 23 and the inner tube 24 can fix and stabilize the column 2 after the height is adjusted.

[0031] like Figure 2 , Figure 3 and Figure 4 As shown, the telescopic mechanism 5 includes a second cylinder 55. A connecting plate 552 is fixedly connected to the upper end of the cylinder body of the second cylinder 55. A fourth fixed pulley 551 is fixedly connected to the middle of the right side of the upper surface of the connecting plate 552. A fourth telescopic joint 54 is fixedly connected to the output end of the second cylinder 55. The middle of the lower surface of the fourth telescopic joint 54 on the left side is fixedly connected to the upper end of the universal wheel 4. A third telescopic joint 53 is movably sleeved on the upper side inside the fourth telescopic joint 54. The lower end of the cylinder body of the second cylinder 55 is fixedly connected to the middle of the lower end inside the third telescopic joint 53. The upper part of the third telescopic joint 53 is movably sleeved with the second telescopic joint 52. The upper part of the second telescopic joint 52 is movably sleeved with the first telescopic joint 51. The middle of the upper left side of the second telescopic joint 52 is fixedly connected to the middle of the lower left side of the second telescopic joint 52. The middle of the right side of the bottom end of the third telescopic joint 53 is fixedly connected to the third fixed pulley 531. The middle of the lower end of the fourth telescopic joint 54 is fixedly connected to the first rope 56. The upper part of the outer surface of the first rope 56 is connected to the fourth fixed pulley. The upper part of the outer surface of pulley 551 overlaps, and the first rope 56 passes through the bottom end of the third telescopic section 53 and the connecting plate 552. The end of the first rope 56 near the connecting plate 552 is fixedly connected to the middle of the lower end of the second telescopic section 52. The middle of the upper right side of the inside of the fourth telescopic section 54 is fixedly connected to the second rope 57. The lower part of the outer surface of the second rope 57 overlaps with the lower part of the outer surface of the third fixed pulley 531. The end of the second rope 57 near the connecting plate 552 is fixedly connected to the middle of the right side of the bottom end of the second telescopic section 52. The connecting plate 552 A third rope 58 is fixedly connected to the left side of the bottom end. The lower part of the outer surface of the third rope 58 overlaps with the lower part of the outer surface of the second fixed pulley 522. The end of the third rope 58 near the second cylinder 55 is fixedly connected to the middle of the left side of the bottom end of the first telescopic joint 51. A fourth rope 59 is fixedly connected to the middle of the lower left side inside the third telescopic joint 53. The upper part of the outer surface of the fourth rope 59 overlaps with the upper part of the outer surface of the first fixed pulley 521. The end of the fourth rope 59 near the connecting plate 552 is fixedly connected to the middle of the left side of the bottom of the first telescopic joint 51.

[0032] It should be noted that the second cylinder 55 drives the connecting plate 552 and the fourth fixed pulley 551 to move up and down. The end of the first rope 56 near the connecting plate 552 is fixedly connected to the middle of the lower end of the second telescopic joint 52. When the fourth telescopic joint 54 extends or retracts, the first rope 56 pulls the second telescopic joint 52 around the fourth fixed pulley 551, causing the second telescopic joint 52 to extend or retract synchronously. The end of the second rope 57 near the second cylinder 55 around the third fixed pulley 531 is fixedly connected to the middle of the right side of the bottom end of the second telescopic joint 52. During the movement of the fourth telescopic joint 54, the second rope 57 pulls the right side of the second telescopic joint 52, assisting its extension and retraction and driving the third telescopic joint. 53 extends and retracts. The third rope 58 and the fourth rope 59 connect the first telescopic joint 51 and the second telescopic joint 52. The third rope 58 is connected to the middle of the left side of the bottom end of the connecting plate 552 and the left side of the bottom end of the first telescopic joint 51. The fourth rope 59 is connected to the middle of the lower left side inside the third telescopic joint 53 and the left side of the bottom of the first telescopic joint 51. When the second telescopic joint 52 extends and retracts under the action of the first rope 56 and the second rope 57, the third rope 58 and the fourth rope 59 will pull the first telescopic joint 51 accordingly, so that the first telescopic joint 51 also extends and retracts synchronously, thereby realizing the linkage of multiple telescopic joints and completing the adjustment of the fence height. In the telescopic mechanism, the fixed pulley plays the role of changing the direction of the rope.

[0033] like Figure 1 and Figure 5 As shown, the crossbeam 1 includes a first crossbeam 11, a second crossbeam 12, a third crossbeam 13, and a fourth crossbeam 14. The left and right ends of the first crossbeam 11 are fixedly connected to the middle of the opposite faces of two first expansion joints 51. The bottom end of the first crossbeam 11 is fixedly connected to the upper ends of several inner tubes 21 arranged in a left-right direction. The bottom end of the second crossbeam 12 is fixedly connected to the upper ends of several first expansion tubes 22 arranged in a left-right direction. The left and right ends of the second crossbeam 12 are fixedly connected to the upper sides of the opposite faces of two second expansion joints 52. The interior of the second crossbeam 12 is connected to... The bottom of the outer surface of several inner tubes 21 is movably sleeved; the bottom end of the third crossbeam 13 is fixedly connected to the upper end of several second telescopic tubes 23 in a left-right direction; the left and right ends of the third crossbeam 13 are fixedly connected to the upper side of the opposite face of two third telescopic sections 53; the inside of the third crossbeam 13 is movably sleeved to the bottom of the outer surface of several first telescopic tubes 22; the upper end of the fourth crossbeam 14 is fixedly connected to the bottom end of several outer tubes 24 in a left-right direction; the left and right ends of the fourth crossbeam 14 are fixedly connected to the middle of the opposite face of the fourth telescopic section 54.

[0034] It should be noted that the first crossbeam 11 connects two first expansion joints 51 and fixes the upper end of the inner tube 21, stabilizing the position of the inner tube 21 and providing a basic support structure for the fence. The second crossbeam 12 connects two second expansion joints 52, sleeves the inner tube 21, and fixes the first expansion tube 22. During the expansion and contraction of the fence, it guides the expansion and contraction direction of the first expansion tube 22, ensuring the stability of the relative position between the first expansion tube 22 and the inner tube 21 and maintaining the integrity of the fence structure. The third crossbeam 13 connects two third expansion joints 53, sleeves the first expansion tube 22, and fixes the second expansion tube 23. It plays a role in positioning and guiding the second expansion tube 23, ensuring the correct relative position of each component of the fence during expansion and contraction and preventing structural deformation. The fourth crossbeam 14 connects two fourth expansion joints 54, fixes the bottom end of the outer tube 24, and together with other crossbeams, forms a complete fence frame to withstand external pressure and ensure that the fence maintains a stable shape under different expansion and contraction states.

[0035] like Figure 6 As shown, the rotating mechanism 3 includes a fixed base 34. The left and right sides of the upper surface of the fixed base 34 are fixedly connected to the bottom ends of the two fourth telescopic sections 54. A fixed rod 33 is rotatably connected to the middle of the right side of the bottom end of the fixed base 34. A gear 32 is fixedly connected to the middle of the outer surface of the fixed rod 33. The bottom end of the fixed rod 33 is fixedly connected to the middle of the upper surface of the positioning seat 6. A connecting rod 341 is fixedly connected to the middle of the right side of the bottom end of the fixed base 34. A first cylinder 31 is fixedly connected to the bottom of the outer surface of the connecting rod 341. A slider 35 is fixedly connected to the output end of the first cylinder 31. A rack 36 is fixedly connected to the rear end of the slider 35. The front end of the outer surface of the rack 36 meshes with the outer surface of the gear 32.

[0036] It should be noted that the first cylinder 31 drives the output end to move left and right, thereby driving the slider 35 fixedly connected to it to move left and right. The slider 35 drives the rack 36 fixedly connected to move left and right. The gear 32 meshes with the rack 36, and the rack 36 rotates around the gear 32, thereby driving the fixed seat 34 to rotate around the gear 32, thereby driving the fence to rotate.

[0037] like Figure 5 As shown, the front of the outer surface of the inner tube 21, the first telescopic tube 22 and the second telescopic tube 23 are all provided with wedge-shaped grooves 25, and the front of the inner surface of the outer tube 24 is fixedly connected with a wedge-shaped protrusion 241.

[0038] It should be noted that the wedge-shaped groove 25 and the wedge-shaped protrusion 241 allow the tubes to fit together tightly, effectively preventing the posts 2 from expanding or contracting unexpectedly and enhancing the stability of the overall fence structure during use.

[0039] like Figure 2 , Figure 3 and Figure 4As shown, a rectangular groove 511 is provided in the middle of the bottom end of the first expansion joint 51, and a through groove 523 is provided on the right side of the bottom end of the second expansion joint 52.

[0040] It should be noted that the rectangular slot 511 and the through slot 523 ensure that the second cylinder 55 can extend and retract stably.

[0041] like Figure 6 As shown, a slide rail 342 is fixedly connected to the left side of the bottom end of the fixed base 34, and the top of the slider 35 is slidably connected to the inner surface of the slide rail 342.

[0042] It should be noted that the slider 35 slides on the slide rail 342 to ensure that the rack 36 can maintain linear motion during the movement, ensuring stable meshing of the gear 32 and the rack 36, and making the rotation process smoother.

[0043] The working principle of this utility model is as follows: When the operator uses the fence, the first cylinder 31 is activated. The first cylinder 31 drives the output end of the first cylinder 31 to move left and right, thereby driving the slider 35 fixedly connected to it to move left and right. The slider 35 drives the rack 36 fixedly connected to it to move left and right. The gear 32 meshes with the rack 36, and the rack 36 rotates around the gear 32, thereby driving the fixed seat 34 to rotate around the gear 32. After the fence has rotated, the operator activates the second cylinder 55. The cylinder body of the second cylinder 55 drives the connecting plate 552 and the fourth fixed pulley 551 to move upward. The end of the first rope 56 near the connecting plate 552 is fixedly connected to the middle of the lower end of the second telescopic joint 52. The first rope 56 pulls the second telescopic joint 52 around the fourth fixed pulley 551, causing the second telescopic joint 52, along with the second crossbeam 12 and the first telescopic tube 22, to extend synchronously. The second rope 57 moves around the third fixed pulley 531. One end near the second cylinder 55 is fixedly connected to the middle of the right side of the bottom end of the second telescopic section 52. During the movement of the fourth telescopic section 54, the second rope 57 pulls the right side of the second telescopic section 52, assisting it in extending and driving the third telescopic section 53, the third crossbeam 13, and the second telescopic tube 23 to extend upward. The third rope 58 and the fourth rope 59 connect the first telescopic section 51 and the second telescopic section 52. The third rope 58 is connected to the middle of the left side of the bottom end of the connecting plate 552 and the left side of the bottom end of the first telescopic section 51. The fourth rope 59 is connected to the middle of the lower left side inside the third telescopic section 53 and the left side of the bottom of the first telescopic section 51. When the second telescopic section 52 extends under the action of the first rope 56 and the second rope 57, the third rope 58 and the fourth rope 59 correspondingly pull the first telescopic section 51, so that the first telescopic section 51 drives the first crossbeam 11 and the inner tube 21 to extend synchronously, completing the height adjustment and thus completing the placement of the fence.

[0044] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "a solution," "some solutions," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that solution or example is included in at least one solution or example of this invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same solution or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more solutions or examples.

Claims

1. A rotatably adjustable fence comprising a positioning seat (6), characterized in that: The upper end of the positioning seat (6) is fixedly connected with a rotating mechanism (3), the upper ends of the rotating mechanism (3) are fixedly connected with telescopic mechanisms (5) on the left and right sides, the bottom end of the telescopic mechanism (5) on the left side is fixedly connected with a universal wheel (4), the opposite surfaces of the two telescopic mechanisms (5) are fixedly connected with a cross beam (1), and the middle of the cross beam (1) is fixedly connected with a plurality of stand columns (2). The inner tube (21) is movably sleeved with a first telescopic tube (22) at the bottom of the outer surface, the first telescopic tube (22) is movably sleeved with a second telescopic tube (23) at the bottom of the outer surface, and the second telescopic tube (23) is movably sleeved with an outer tube (24) at the bottom of the outer surface.

2. A rotatably adjustable fence according to claim 1, wherein, The telescopic mechanism (5) includes a second cylinder (55), the upper end of the cylinder body of the second cylinder (55) is fixedly connected with a connecting plate (552), the upper surface of the connecting plate (552) is rotatably connected with a fourth fixed pulley (551) at the middle of the right side, the output end of the second cylinder (55) is fixedly connected with a fourth telescopic joint (54), the upper end of the universal wheel (4) is fixedly connected with the lower surface of the middle of the fourth telescopic joint (54) on the left side, the inside of the upper side of the fourth telescopic joint (54) movably sleeves a third telescopic joint (53), the lower end of the cylinder body of the second cylinder (55) is fixedly connected with the lower end of the inside of the third telescopic joint (53), the inside of the upper side of the third telescopic joint (53) movably sleeves a second telescopic joint (52), the inside of the upper side of the second telescopic joint (52) movably sleeves a first telescopic joint (51), the inside of the left upper side of the second telescopic joint (52) is rotatably connected with a first fixed pulley (521), the inside of the left lower side of the second telescopic joint (52) is rotatably connected with a second fixed pulley (522), the bottom end of the right side of the third telescopic joint (53) is rotatably connected with a third fixed pulley (531), the inside of the lower end of the fourth telescopic joint (54) is fixedly connected with a first rope (56), the upper portion of the outer surface of the first rope (56) is overlapped with the upper portion of the outer surface of the fourth fixed pulley (551), and the first rope (56) penetrates the bottom end of the third telescopic joint (53) and the connecting plate (552), one end of the first rope (56) close to the connecting plate (552) is fixedly connected with the inside of the lower end of the second telescopic joint (52), the inside of the right upper side of the fourth telescopic joint (54) is fixedly connected with a second rope (57), the lower portion of the outer surface of the second rope (57) is overlapped with the lower portion of the outer surface of the third fixed pulley (531), one end of the second rope (57) close to the second cylinder (55) is fixedly connected with the inside of the lower end of the second telescopic joint (52), the left side of the bottom end of the connecting plate (552) is fixedly connected with a third rope (58), the lower portion of the outer surface of the third rope (58) is overlapped with the lower portion of the outer surface of the second fixed pulley (522), one end of the third rope (58) away from the connecting plate (552) is fixedly connected with the inside of the lower end of the first telescopic joint (51), the inside of the left lower side of the third telescopic joint (53) is fixedly connected with a fourth rope (59), the upper portion of the outer surface of the fourth rope (59) is overlapped with the upper portion of the outer surface of the first fixed pulley (521), one end of the fourth rope (59) close to the connecting plate (552) is fixedly connected with the inside of the lower end of the first telescopic joint (51).

3. A rotatably adjustable fence according to claim 1, wherein, The crossbeam (1) includes first crossbeam (11), second crossbeam (12), third crossbeam (13) and fourth crossbeam (14), the left and right ends of first crossbeam (11) are fixedly connected with the opposite sides of the middle of two first expansion joints (51), the bottom end of first crossbeam (11) is fixedly connected with the upper end of a plurality of inner tubes (21) in left and right direction arrangement, the bottom end of second crossbeam (12) is fixedly connected with the upper end of a plurality of first telescopic tubes (22) in left and right direction arrangement, the left and right ends of second crossbeam (12) are fixedly connected with the upper sides of the opposite sides of two second expansion joints (52), the inside of second crossbeam (12) is movably sleeved with the bottom of the outer surface of a plurality of inner tubes (21), the bottom end of third crossbeam (13) is fixedly connected with the upper end of a plurality of second telescopic tubes (23) in left and right direction arrangement, the left and right ends of third crossbeam (13) are fixedly connected with the upper sides of the opposite sides of two third expansion joints (53), the inside of third crossbeam (13) is movably sleeved with the bottom of the outer surface of a plurality of first telescopic tubes (22), the upper end of fourth crossbeam (14) is fixedly connected with the bottom end of a plurality of outer tubes (24) in left and right direction arrangement, the left and right ends of fourth crossbeam (14) are fixedly connected with the opposite sides of the middle of fourth expansion joints (54).

4. A rotatably adjustable fence according to claim 1, wherein, The rotating mechanism (3) includes a fixed seat (34), the upper surface of the fixed seat (34) is fixedly connected with the side of the bottom end of two fourth expansion joints (54) on the left and right sides, a fixed rod (33) is rotatably connected with the middle of the right side of the bottom end of the fixed seat (34), a gear (32) is fixedly connected with the middle of the outer surface of the fixed rod (33), the bottom end of the fixed rod (33) is fixedly connected with the upper surface of the middle of the positioning seat (6), a connecting rod (341) is fixedly connected with the middle of the right part of the bottom end of the fixed seat (34), a first air cylinder (31) is fixedly connected with the bottom of the outer surface of the connecting rod (341), a sliding block (35) is fixedly connected with the output end of the first air cylinder (31), a rack (36) is fixedly connected with the rear end of the sliding block (35), the front end of the outer surface of the rack (36) is meshingly connected with the outer surface of the gear (32).

5. A rotatably adjustable fence according to claim 1, wherein, The front part of the outer surface of the inner tube (21), the first telescopic tube (22) and the second telescopic tube (23) is provided with a wedge-shaped groove (25), and the front part of the inner surface of the outer tube (24) is fixedly connected with a wedge-shaped protrusion (241).

6. A rotatably adjustable fence according to claim 2, wherein, The middle of the bottom end of the first expansion joint (51) is provided with a rectangular groove (511), and the right side of the bottom end of the second expansion joint (52) is provided with a through groove (523).

7. A rotatably adjustable fence according to claim 4 wherein, The bottom left side of the fixed seat (34) is fixedly connected with a sliding rail (342), and the top of the sliding block (35) is slidingly connected with the inner surface of the sliding rail (342).

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