Magnetic-expandable PVC guardrail

Abstract

The utility model discloses a PVC guardrail can magnetically attract extension relates to the field of conveying equipment protection device, it includes fixed plate, and the both sides of fixed plate along width direction are slidably connected with magnetic attraction seat and movable clamping plate respectively, and one side of magnetic attraction seat lower extreme is equipped with magnetic attraction piece no.

Description

Technical Field

[0001] This utility model relates to the field of protective devices for conveyor equipment, and in particular to a magnetically expandable PVC guardrail. Background Technology

[0002] Currently, when using conveying equipment such as belt conveyors and roller conveyors to transport items, PVC guardrails are usually installed on both sides of the conveyor belt to reduce the probability of items falling off the conveyor.

[0003] Related technology can be found in Chinese Patent No. CN223328351U, which discloses a conveyor railing with a buffer protection structure. The buffer assembly includes a frame with an arc-shaped structure. A pivot is located between the upper and lower frames, and the end of the pivot is connected to the frame via a bearing. A buffer wheel is mounted on the pivot. The frame is connected to the conveyor railing, which consists of a guardrail panel and support columns. The guardrail panel has a "C"-shaped structure, and the support columns are located on the inner side of the guardrail panel. There are slots between the support columns. The conveyor railing is located on both sides of the main conveyor belt and the diversion conveyor belt. The buffer assembly is located at the corner where the main conveyor belt and the diversion conveyor belt connect. An air jet device is connected to the frame via a column. By using a conveyor railing with a buffer assembly, damage to goods during transport can be avoided.

[0004] Regarding the aforementioned technologies, during the operation of the device, the height of the guardrail and its installation position along the length of the conveyor belt need to be added or removed depending on the product height and the conveyor belt length. When the guardrail is connected to the conveyor belt by bolts, multiple different bolts need to be tightened, which is not conducive to improving the installation and adjustment efficiency of the guardrail. Utility Model Content

[0005] To improve the efficiency of guardrail installation and adjustment, this application provides a magnetically expandable PVC guardrail.

[0006] This application provides a magnetically expandable PVC guardrail, employing the following technical solution: A magnetically expandable PVC guardrail includes a fixed plate, which is vertically installed on both sides of a conveyor belt along its width. The fixed plate contains a magnetic plate. Magnetic bases and movable clamping plates are slidably connected to the upper ends of the fixed plate on both sides along its width. A magnetic block one is fixed to the side of the magnetic base near the fixed plate, and a magnetic block two is fixed to the side of the movable clamping plate near the fixed plate. Magnetic blocks one and two face each other and both attract the magnetic plate. A groove is formed along the length of the magnetic base on the side near the movable clamping plate. A slider is fixed to the upper end of the movable clamping plate, and the slider is inserted into the groove and abuts against the inner wall of the groove. A top plate is provided at the upper end of the magnetic base. An adjusting component and a telescopic component for shielding the conveyor belt are provided between the magnetic base and the top plate. The adjusting component moves the top plate closer to or away from the fixed plate, and the end of the telescopic component near the top plate moves vertically closer to or away from the fixed plate along with the top plate.

[0007] By adopting the above technical solution, magnetic block one and magnetic block two attract each other and tighten the fixed plate, and drive the magnetic base and movable clamping plate to be fixed relative to the fixed plate. Both magnetic block one and magnetic block two attract the magnetic plate, improving the installation stability between the movable clamping plate and the magnetic base. The movable clamping plate improves the compactness between the movable clamping plate and the magnetic base through the cooperation of the slider and the groove. The adjusting component adjusts the vertical displacement of the top plate and drives the telescopic component to contract or expand vertically to adapt to the height of the items on the conveyor belt, so that the telescopic component always blocks the conveyor belt, thereby improving the applicability of the device. At the same time, by separating the movable clamping plate and the magnetic base, the relative fixation between the movable clamping plate and the magnetic base is released, thereby realizing the disassembly of the guardrail and its movement along the length of the conveyor belt, which is beneficial to improving the installation and adjustment efficiency of the guardrail.

[0008] Optionally, the telescopic component includes a telescopic plate made of a deformable material. The adjusting component includes two intersecting adjusting rods and two discs with their end faces facing each other. A limit rod is coaxially fixed between the two discs. The limit rod passes through the intersection of the two adjusting rods and is rotatably connected to the two limit rods in a vertical direction. The upper end of the magnetic base is provided with a lower connecting groove, and the lower end of the top plate is provided with an upper connecting groove. The two ends of the two adjusting rods along the length direction are respectively inserted into the upper connecting groove and the lower connecting groove, and move along the length direction of the upper connecting groove and the lower connecting groove. The telescopic plate retracts or expands as the adjusting rods move. The discs are provided with locking components for locking the adjusting rods.

[0009] By adopting the above technical solution, the fixing plate supports the magnetic base, and the magnetic base and the top plate cooperate to support and limit the adjusting rod through the lower connecting groove and the upper connecting groove. The two discs fix and support the limiting rod, and the limiting rod fixes and limits the intersection of the two supporting rods, thereby improving the movement stability of the two adjusting rods. The locking component fixes the angle between the two condition rods, thereby fixing the displacement of the telescopic component along the height direction, and thus improving the working stability of the telescopic component.

[0010] Optionally, the locking component includes two bolts and two nuts. The two bolts are threadedly connected to two adjusting rods respectively. The side of the disc away from the telescopic component and opposite to the other disc has an annular opening along the circumference. The bolts pass through the adjusting rods and the annular opening and are threadedly connected to the nuts. The nuts abut against the surface of the disc.

[0011] By adopting the above technical solution, the disc limits and guides the bolt through the annular opening, and the nut and the disc cooperate to fix the bolt, thereby fixing the adjusting rod, which helps to reduce the probability of the adjusting rod shaking.

[0012] Optionally, magnetic blocks three are installed on both sides of the top plate along the width direction, and adjacent magnetic blocks three attract each other.

[0013] By adopting the above technical solution, the three adjacent magnetic blocks attract each other, causing the adjacent top plates to approach and abut each other, and positioning the connection between the top plates, which helps to improve the connection stability and high consistency between the top plates.

[0014] Optionally, a laser emitter is provided at one end of the upper end of the top plate along the length direction, and a receiving block is provided at the other end, which is directly opposite the laser emitter. When adjacent top plates are at the same height, the laser beam emitted by the laser emitter is directly opposite the receiving block.

[0015] By adopting the above technical solution, operators can use the light emitted by the laser emitter to illuminate the receiving block and calibrate the height of adjacent top plates, further improving the consistency of the installation height of the top plates and reducing the probability that uneven plate heights will cause items to fall off the conveyor belt from the lower guardrail.

[0016] Optionally, the telescopic plate has several parallel observation ports along its horizontal axis, and the observation ports are arranged vertically.

[0017] By adopting the above technical solution, operators can observe the conveyor belt's movement through the observation port and adjust the top plate height to a suitable position according to the height of the items, which helps improve the ease of use of the device.

[0018] Optionally, the upper end of the slider is provided with a positioning block, and the inner wall of the slide groove is provided with a positioning groove that matches the positioning block. The positioning block is inserted into the positioning groove and fits against the inner wall of the positioning groove.

[0019] By adopting the above technical solution, the positioning block and positioning groove work together to fix the lateral displacement of the magnetic base and the movable clamping plate, reducing the probability of misalignment and improving the stability of the guardrail installation.

[0020] Optionally, the telescopic component includes a roller blind and a roller drum. The roller drum is rotatably connected to a support rod on the same axis. The two ends of the support rod along the length direction pass through the top plate of the roller drum and are fixedly connected. The roller blind is wound around the roller drum. A spring is coaxially installed inside the roller drum. The end of the spring is fixedly connected to the roller drum, and the center of the spring is fixedly connected to the support rod. In its natural state, the spring drives the roller blind to roll up. The roller blind moves with the two adjusting rods to roll up or down.

[0021] By adopting the above technical solution, the top plate supports the roller drum through the support rod, and the roller drum supports the roller blind. Thus, the top plate supports the roller blind. When the top plate is close to the fixed plate, the spring coils inward under its own elastic force, causing the roller drum to rotate in the direction of the roller blind's retraction. When the top plate is away from the fixed plate, the spring coils out, and the roller drum tensions the roller blind, ensuring that the roller blind always remains flat and always covers both sides of the conveyor belt, which helps to improve the convenience of the roller blind's covering function.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Magnetic block one and magnetic block two attract each other and clamp the fixed plate, causing the magnetic base and movable clamping plate to be fixed relative to the fixed plate. Both magnetic block one and magnetic block two attract the magnetic plate, improving the installation stability between the movable clamping plate and the magnetic base. The movable clamping plate improves the compactness between the movable clamping plate and the magnetic base through the cooperation of the slider and the groove. The adjusting component adjusts the vertical displacement of the top plate and drives the telescopic component to contract or expand vertically to adapt to the height of the items on the conveyor belt, so that the telescopic component always blocks the conveyor belt, thereby improving the applicability of the device. At the same time, by separating the movable clamping plate and the magnetic base, the relative fixation between the movable clamping plate and the magnetic base is released, thereby realizing the disassembly of the guardrail and its movement along the length of the conveyor belt, which is beneficial to improving the installation and adjustment efficiency of the guardrail. 2. The fixed plate supports the magnetic base. The magnetic base and the top plate cooperate to support and limit the adjusting rod through the lower connecting groove and the upper connecting groove. The two discs fix and support the limiting rod. The limiting rod fixes and limits the intersection of the two supporting rods, improving the movement stability of the two adjusting rods. The locking part fixes the angle between the two condition rods, thereby fixing the displacement of the telescopic part along the height direction, thus improving the working stability of the telescopic part. 3. The disc limits and guides the bolt through the annular opening. The nut and the disc work together to fix the bolt, thereby fixing the adjusting rod and reducing the probability of the adjusting rod shaking. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0024] Figure 2 This is a schematic diagram designed to highlight the movable rod structure.

[0025] Figure 3 This is a schematic diagram designed to highlight the positions of bolts and nuts.

[0026] Figure 4 This is a schematic diagram of the overall structure of Example 2.

[0027] Figure 5 This is a schematic diagram designed to highlight the position of the mainspring.

[0028] Explanation of reference numerals in the attached drawings: 1. Fixed plate; 11. Magnetic plate; 2. Magnetic base; 21. Magnetic block one; 22. Slide groove; 221. Positioning groove; 23. Lower connecting groove; 3. Movable clamping plate; 31. Magnetic block two; 32. Slider; 33. Positioning block; 4. Top plate; 41. Magnetic block three; 42. Laser emitter; 43. Receiver block; 44. Upper connecting groove; 5. Telescopic plate; 51. Observation port; 6. Adjusting component; 61. Adjusting rod; 611. Moving rod one; 612. Moving rod two; 613. Moving rod three; 62. Disc; 621. Annular opening; 63. Limiting rod; 7. Locking component; 71. Bolt; 72. Nut; 8. Roller drum; 81. Roller blind; 82. Support rod; 83. Spring. Detailed Implementation

[0029] The present application will be further described in detail below with reference to all the accompanying drawings.

[0030] This application discloses a magnetically expandable PVC guardrail.

[0031] Example 1 Reference Figure 1 A magnetically expandable PVC guardrail includes a fixed plate 1. Magnetic bases 2 and movable clamping plates 3 are slidably connected to both sides of the fixed plate 1 along its thickness direction. A placement groove 1 is formed along the length of the side of the magnetic base 2 closest to the movable clamping plate 3, and a magnetic block 21 is fixedly connected within the placement groove, supporting and fixing the magnetic block 21. A second placement groove 2 is formed along the length of the side of the movable clamping plate 3 closest to the fixed plate 1, and a magnetic block 31 is placed within the second placement groove, supporting and fixing the magnetic block 31. Magnetic blocks 21 and 31 face each other, attracting each other to initially fix the magnetic base 2 and the movable clamping plate 3. A magnetic plate 11 is installed inside the fixed plate, and the fixed plate 1 attracts both magnetic blocks 21 and 31 through the magnetic plate 11, further fixing the magnetic base 2 and the movable clamping plate 3.

[0032] Reference Figure 1The magnetic base 2 has a groove 22 along its length on the side near the movable clamping plate 3. A slider 32 is fixedly installed on the side of the movable clamping plate 3 near the magnetic base 2. A positioning block 33 is fixedly installed on the upper end of the slider 32. A positioning groove 221 adapted to the positioning block 33 is formed on the inner wall of the groove 22. The groove 22 guides and limits the lateral displacement of the slider 32, and the positioning groove 221 guides and limits the lateral displacement of the positioning block 33. This further enhances the connection stability between the movable clamping plate 3 and the magnetic base 2, reduces the probability of relative movement between the magnetic base 2 and the movable clamping plate 3 along their own thickness direction, and helps to improve the stability of the guard plate installation.

[0033] Reference Figure 1 When the operator inserts the movable clamp 3 from one end of the magnetic base 2 into the slide groove 22, the slider 32 fits against the inner wall of the slide groove 22, and the positioning block 33 fits against the inner wall of the positioning groove 221, thus realizing the installation of the guardrail and the conveyor belt. When the operator slides the magnetic base 2 and the movable clamp 3 in opposite directions, the magnetic base 2 and the movable clamp 3 separate, thereby realizing the disassembly of the guardrail and the conveyor belt. At the same time, it is convenient to add guardrails according to the length of the conveyor belt to change the length of the guardrail, which helps to improve the convenience of guardrail installation and disassembly and position adjustment along the length of the conveyor belt.

[0034] Reference Figure 1 A top plate 4 is installed on the upper end of the magnetic base 2. A telescopic component, a telescopic plate 5, is installed between the top plate 4 and the magnetic base 2. The telescopic plate 5 is made of a deformable material, such as rubber. One end of the telescopic plate 5 along the height direction is connected to the bottom of the top plate 4, and the other end is connected to the magnetic base 2. The fixing plate 1 fixes and supports the telescopic plate 5 through the magnetic base 2. An adjusting component 6 is installed between the top plate 4 and the magnetic base 2. The adjusting component 6 adjusts the vertical length of the telescopic plate 5 by changing the distance between the top plate 4 and the magnetic base 2 to adapt to the height of the items on the conveyor belt, which helps to improve the applicability of the guardrail. Several observation ports 51 are opened laterally on the surface of the telescopic plate 5. All observation ports 51 are arranged vertically, which facilitates the operator to observe the conveying status of items inside the conveyor belt, which helps to improve the convenience of device operation.

[0035] Reference Figure 1 and Figure 2The adjusting component 6 includes two adjusting rods 61 and two discs 62. The lower end of the top plate 4 has an upper connecting groove 44 along its length, and the upper end of the magnetic base 2 has a lower connecting groove 23 along its length. The two adjusting rods 61 are stacked crosswise, and their ends slide laterally along the upper connecting groove 44 and the lower connecting groove 23, respectively. A limit rod 63 is coaxially fixed between the two discs 62, supporting and fixing the limit rod 63. The limit rod 63 passes through the intersection of the two adjusting rods 61 and is rotatably connected to both rods 61. A locking component 7 is installed on the disc 62. When the adjusting rods 61 are adjusted to the desired angle, the locking component 7 fixes the angle between the two adjusting rods 61, which helps improve the stability of the adjusting rods 61, thereby improving the working stability of the telescopic plate 5.

[0036] Reference Figure 1 and Figure 3 The locking component 7 includes two bolts 71 and two nuts 72. Both discs 62 have circumferentially open annular openings 621. The two bolts 71 are threadedly connected to different adjusting rods 61. One end of each bolt 71 passes through the annular opening 621 and one end of the disc 62 and is threadedly connected to the nut 72. The nut 72 abuts against the surface of the disc 62, and the nut 72 and disc 62 cooperate to fix the angle between the two adjusting rods 61. When the operator loosens the nut 72, it contacts the limiting position between the adjusting rod 61 and the disc 62. When the adjusting rod 61 is rotated vertically, it causes the top plate 4 to move vertically closer to or further away from the magnetic base 2, causing the telescopic plate 5 to contract or expand vertically, thereby adjusting the height of the telescopic plate 5 to accommodate items of different heights on the conveyor belt, thus improving the applicability of the device.

[0037] Reference Figure 1 and Figure 2 The adjusting rod 61 includes a first movable rod 611, two second movable rods 612, and two third movable rods 613. The first movable rod 611 is parallel to the telescopic plate 5. The second movable rods 612 are located at both ends of the adjusting rod 61 and are perpendicular to the first movable rod 611. The third movable rods 613 are connected to the ends of the second movable rods 612 away from the first movable rod 611. The second movable rods 612 and the third movable rods 613 of the first movable rod 611 are respectively inserted into the upper connecting groove 44 and the lower connecting groove 23, and the upper connecting groove 44 and the lower connecting groove 23 are slidably connected. The upper connecting groove 44 and the lower connecting groove 23 guide and limit the first movable rod 611 through the second movable rods 612 and the third movable rods 613.

[0038] Reference Figure 1Magnetic blocks 41 are installed at both ends of the top plate 4 along the length direction. When the two guardrails approach each other, the magnetic blocks 41 attract each other and fix the adjacent top plates 4, thereby improving the connection stability between the top plates 4 and the structural stability of the upper part of the guardrail, which is conducive to improving the overall stability of the guardrail during operation.

[0039] Reference Figure 1 A laser emitter 42 and a receiver block 43 are installed on the side of the top plate 4 away from the telescopic plate 5 along the thickness direction. The laser emitter 42 and the receiver block 43 are located on both sides of the top plate 4 along the length direction. In the installed state, the laser emitter 42 and the receiver block 43 of the adjacent top plates 4 are located on the adjacent side. When the operator moves the adjustment rod 61 so that the ray emitted by the laser emitter 42 is directly opposite the receiver block 43, the height direction between the adjacent top plates 4 is the same, thereby reducing the probability that the items will slide off the lower part of the railing due to the difference in height.

[0040] The implementation principle of a magnetically expandable PVC guardrail according to an embodiment of this application is as follows: The operator aligns the slider 32 on the movable clamping plate 3 with the groove 22 on the magnetic base 2, aligns the positioning block 33 with the positioning groove 221, and inserts the slider 32 into the groove 22 and the positioning block 33 into the positioning groove 221, thus installing the movable clamping plate 3 and the magnetic base 2. Magnetic block one 21, magnetic block two 31, and the magnetic plate 11 are all aligned with each other, strengthening the fixation between the magnetic base 2 and the movable clamping plate 3. The top plate 4, the magnetic base 2, and the adjusting rod 61 cooperate to support the telescopic plate 5. The operator can adjust the distance between the two adjusting rods 61 to... The movable top plate 4 moves vertically closer to or further away from the magnetic base 2, causing the telescopic component to move vertically closer to or further away, thereby changing the height of the guardrail to accommodate items of different heights transported on the conveyor belt. During the operation of the device, the operator can install and remove the guardrail from the conveyor belt by sliding the magnetic base 2 and the movable clamp 3. At the same time, the movable clamp 3 and the magnetic base 2 can be slid along the length of the fixed plate 1 and guardrails can be added to both sides of the conveyor belt to adjust the position and length of the guardrail, which helps to improve the efficiency of guardrail installation, removal and quick adjustment. The height of the telescopic component can be adjusted by the adjusting component 6 and the height can be fixed, which helps to improve the convenience and applicability of the device.

[0041] Example 2 The difference between this embodiment and embodiment 1 is that a roller 8 is installed on the top plate 4, and a roller shutter 81 is wound on the roller 8.

[0042] Reference Figure 4 and Figure 5A support rod 82 is coaxially rotatably connected to the drum 8. The support rod 82 passes through both ends of the drum 8 and is fixedly connected to the top plate 4. The top plate 4 supports the drum 8 through the support rod 82. The roller blind 81 is fixedly connected to the drum 8. The end of the roller blind 81 away from the drum 8 is fixedly connected to the magnetic seat 2. The magnetic seat 2 and the top plate 4 cooperate to fix the roller blind 81. A spring 83 is installed inside the drum 8. The end of the spring 83 is fixedly installed to the inner wall of the drum 8. The support rod 82 passes through the center of the spring 83 and is fixedly connected to the spring 83. The drum 8 and the support rod 82 cooperate to support the spring 83. In its natural state, the spring 83 has a tendency to pull the roller blind 81 to roll up.

[0043] Reference Figure 4 and Figure 5 When the operator rotates the adjusting rod 61 to bring the top plate 4 closer to the magnetic base 2, the drum 8 rotates and drives the spring 83 to unfold, thus unfolding the roller blind 81. When the top plate 4 moves away from the magnetic base 2, the spring 83 winds up and drives the drum 8 to rotate in the direction of winding the roller blind 81. Under the support of the top plate 4 and the magnetic base 2, the roller blind 81 always remains in the unfolded state and always blocks both sides of the conveyor belt, reducing the probability of the roller blind 81 contacting the items on the conveyor belt and affecting the conveying of items. This helps to improve the safety and convenience of the roller blind 81 in blocking the items.

[0044] Reference Figure 4 and Figure 5 The roller shutter 81 has multiple rectangular holes along its width and is arranged along its length, which makes it easy for operators to observe the items being transported on the conveyor belt through the rectangular holes, thus improving the ease of operation of the device.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A magnetically expandable PVC guardrail, comprising a fixing plate (1), the fixing plate (1) being vertically installed on both sides of a conveyor belt along its width direction, characterized in that: The fixed plate (1) is provided with a magnetic plate (11). Magnetic bases (2) and movable clamps (3) are slidably connected to both sides of the upper end of the fixed block along the width direction. Magnetic base (2) has a magnetic block one (21) fixed on the side near the fixed plate (1), and magnetic block two (31) is fixed on the side of the movable clamp (3) near the fixed plate (1). Magnetic block one (21) and magnetic block two (31) face each other and both attract the magnetic plate (11). The magnetic base (2) has an opening along its own length on the side near the movable clamp (3). There is a chute (22), and a slider (32) is fixed at the upper end of the movable clamp (3). The slider (32) is inserted into the chute (22) and abuts against the inner wall of the chute (22). A top plate (4) is provided at the upper end of the magnetic suction seat (2). An adjusting member (6) and a telescopic member for blocking the conveyor belt are provided between the magnetic suction seat (2) and the top plate (4). The adjusting member (6) is used to drive the top plate (4) to move closer to or away from the fixed plate (1). The end of the telescopic member that is close to the top plate (4) moves vertically closer to or away from the fixed plate (1) along with the top plate (4).

2. The magnetically expandable PVC fence according to claim 1, characterized in that: The telescopic component includes a telescopic plate (5) made of deformable material. The adjusting component (6) includes two intersecting adjusting rods (61) and two discs (62). The end faces of the two discs (62) face each other. A limiting rod (63) is coaxially fixed between the two discs (62). The limiting rod (63) passes through the intersection of the two adjusting rods (61) and is vertically rotatably connected to the two limiting rods (63). The upper end of the magnetic base (2) is provided with a lower connecting groove (23), and the lower end of the top plate (4) is provided with an upper connecting groove (44). The two adjusting rods (61) are inserted into the upper connecting groove (44) and the lower connecting groove (23) at their two ends along the length direction, and move along the length direction of the upper connecting groove (44) and the lower connecting groove (23). The telescopic plate (5) moves with the adjusting rods (61) to retract or expand. The discs (62) are provided with locking components (7) for locking the adjusting rods (61).

3. The magnetically expandable PVC fence according to claim 2, characterized in that: The locking component (7) includes two bolts (71) and two nuts (72). The two bolts (71) are threadedly connected to the two adjusting rods (61) respectively. The disc (62) away from the telescopic component has an annular opening (621) on the side opposite to the other disc (62) along the circumference. The bolts (71) pass through the adjusting rods (61) and the annular opening (621) and are threadedly connected to the nuts (72). The nuts (72) abut against the surface of the disc (62).

4. The magnetically expandable PVC fence according to claim 1, characterized in that: The top plate (4) is equipped with magnetic blocks (41) on both sides along the width direction, and adjacent magnetic blocks (41) attract each other.

5. A magnetically expandable PVC fence according to claim 1, characterized in that: The top plate (4) has a laser emitter (42) at one end along the length direction and a receiver block (43) facing the laser emitter (42) at the other end. When adjacent top plates (4) are at the same height, the laser beam emitted by the laser emitter (42) is facing the receiver block (43).

6. A magnetically expandable PVC fence according to claim 2, characterized in that: The telescopic plate (5) has several parallel observation ports (51) along its horizontal direction, and the observation ports (51) are arranged vertically.

7. A magnetically expandable PVC fence according to claim 1, characterized in that: The upper end of the slider (32) is provided with a positioning block (33), and the inner wall of the slide groove (22) is provided with a positioning groove (221) that is adapted to the positioning block (33). The positioning block (33) is inserted into the positioning groove (221) and fits against the inner wall of the positioning groove (221).

8. A magnetically expandable PVC fence according to claim 1, characterized in that: The telescopic component includes a roller blind (81) and a roller (8). The roller (8) is coaxially rotatably connected to a support rod (82). The two ends of the support rod (82) along the length direction pass through the top plate (4) of the roller (8) and are fixedly connected. The roller blind (81) is wound around the roller (8). A spring (83) is coaxially provided inside the roller (8). The end of the spring (83) is fixedly connected to the roller (8), and the center of the spring (83) is fixedly connected to the support rod (82). In its natural state, the spring (83) drives the roller blind (81) to roll up. The roller blind (81) moves with the two adjusting rods (61) to roll up or unroll.

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