Height-adjustable safety guardrail

Abstract

The utility model discloses a height-adjustable safety guardrail which comprises a door frame and a door fence, and the number of the door fence is one. A doorway position is reserved in the door frame, the door fence is hinged to the interior of the door frame, and the door fence is used for opening and closing the doorway position; the first inner frame strip and the second inner frame strip of the door frame and the telescopic frame strip of the door fence are each of a telescopic structure formed by connecting a sleeve and a casing pipe, so that the height of the safety fence can be adjusted according to the installation scene so as to meet the use requirement, and the safety fence is simple in structure, convenient to install, flexible to carry and capable of effectively overcoming the defects in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of safety guardrails, in particular to a safety guardrail with adjustable height. Background Art

[0002] Home safety guardrails are generally installed at doorways or stairwells, and can provide effective protection for family members. Specifically, safety guardrails can prevent children or pets from entering more dangerous areas of the home, such as kitchens, stairs, balconies, etc.

[0003] However, the height of the safety guardrail in the prior art is generally fixed, which limits the application scenarios of the safety guardrail and cannot be effectively installed and used according to the actual height, which causes certain inconveniences. Moreover, when transporting the safety guardrail, the excessive size of the safety guardrail also makes the transportation process inflexible and inconvenient. Utility Model Content

[0004] The purpose of the utility model is to provide a height-adjustable safety guardrail, which has an adjustable height, broadens the application scenarios of the safety guardrail, and has a simple structure, easy installation, and flexible transportation, which can effectively overcome the shortcomings of the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A height-adjustable safety guardrail comprises a door frame and a door rail, wherein the number of the door rail is one; a door position is reserved inside the door frame, the door rail is hinged inside the door frame, and the door rail is used to open and close the door position;

[0007] The door frame comprises an upper frame bar, a first inner frame bar, a lower frame bar and a second inner frame bar which are connected end to end in sequence, and the upper frame bar, the first inner frame bar, the lower frame bar and the second inner frame bar surround the door position;

[0008] The door rail comprises an upper connecting bar, a telescopic frame bar and a lower connecting bar, wherein a plurality of telescopic frame bars are provided, and the plurality of telescopic frame bars are connected between the upper connecting bar and the lower connecting bar in an arranged manner at intervals;

[0009] The first inner frame bar, the second inner frame bar and the telescopic frame bar all extend vertically, and the first inner frame bar, the second inner frame bar and the telescopic frame bar all include a sleeve and a sleeve, the end of the sleeve is connected to the top of the sleeve, and the sleeve is installed inside the sleeve so as to be movable up and down;

[0010] The top ends of the sleeves of the first inner frame bar and the second inner frame bar are connected to the upper frame bar, and the ends of the sleeves of the first inner frame bar and the second inner frame bar are connected to the lower frame bar;

[0011] The top end of the sleeve of the telescopic frame bar is connected to the upper connecting bar, and the end of the sleeve of the telescopic frame bar is connected to the lower connecting bar.

[0012] Preferably, the door rail further comprises a middle beam, the middle beam is located in the middle of the door rail, and the sleeves of a plurality of the telescopic frame strips are connected between the middle beam and the lower connecting strip in an intervally arranged manner.

[0013] Preferably, it further comprises a twist locking member, wherein the twist locking member is rotatably mounted on the edge of the center beam;

[0014] When the twist locking member is in an unlocked state, the door rail rotates relative to the door frame;

[0015] When the twist locking member is in a locked state, the door frame and the door rail are relatively stationary.

[0016] Preferably, the twisting locking member comprises a rotating twisting member, a locking sheet and a locking block;

[0017] The rotating torsion member is rotatably mounted on the front side of the middle beam, and the locking plate is rotatably mounted on the rear side of the middle beam. The rotating torsion member and the locking plate are connected, and the rotation of the rotating torsion member drives the rotation of the locking plate.

[0018] The locking block is protrudingly mounted on the rear side of the door frame; the locking piece is provided with a locking groove, and the locking groove is used to accommodate the locking block;

[0019] When the twist locking member is in an unlocked state, the movable end of the locking piece abuts against the middle beam;

[0020] When the twist locking member is in a locked state, the movable end of the locking sheet abuts against the door frame, and the locking block is located inside the locking groove.

[0021] Preferably, a limiting block is protrudingly provided on the end side wall of the sleeve of the first inner frame strip and / or the second inner frame strip, and the limiting block is located inside the sleeve corresponding to the sleeve.

[0022] Preferably, the door frame further comprises a first outer frame bar and a second outer frame bar, wherein the first outer frame bar and the second outer frame bar are both vertically extended and connected between the upper frame bar and the lower frame bar, and the first outer frame bar is located on the outer side of the first inner frame bar, and the second outer frame bar is located on the outer side of the second inner frame bar;

[0023] The first outer frame bar and the second outer frame bar each include a sleeve and a sleeve, the end of the sleeve is connected to the top of the sleeve, and the sleeve is installed inside the sleeve so as to be movable up and down;

[0024] The top ends of the sleeves of the first outer frame bar and the second outer frame bar are connected to the upper frame bar, and the ends of the sleeves of the first outer frame bar and the second outer frame bar are connected to the lower frame bar;

[0025] The cross-sectional shapes of the first inner frame strip and the second inner frame strip are both elliptical;

[0026] The cross-sectional shapes of the first outer frame strip and the second outer frame strip are both circular.

[0027] Preferably, the door frame further comprises fixed abutments, and four fixed abutments are provided;

[0028] The two fixed blocks are protrudingly installed at the two ends of the upper frame bar so as to be horizontally movable;

[0029] The remaining two fixed blocks are protruded and installed at two ends of the lower frame bar in a horizontally movable manner;

[0030] The outer end surface of the fixed abutment block is used to abut against the wall.

[0031] Preferably, the door frame further comprises a first limiting frame bar and a second limiting frame bar, wherein the first limiting frame bar and the second limiting frame bar are both vertically extended and connected between the upper frame bar and the lower frame bar, and the first limiting frame bar is located outside the first outer frame bar, and the second limiting frame bar is located outside the second outer frame bar;

[0032] The first limiting frame bar and the second limiting frame bar both include a sleeve and a sleeve, the end of the sleeve is connected to the top of the sleeve, and the sleeve is installed inside the sleeve so as to be movable up and down;

[0033] The top ends of the sleeves of the first limiting frame bar and the second limiting frame bar are connected to the upper frame bar, and the ends of the sleeves of the first limiting frame bar and the second limiting frame bar are connected to the lower frame bar;

[0034] The sleeve height of the first limit frame strip is equal to the sleeve height of the second limit frame strip, and the sleeve height of the first limit frame strip is greater than the sleeve height of the first outer frame strip and the second outer frame strip, the sleeve height of the first limit frame strip is greater than the sleeve height of the first inner frame strip and the second inner frame strip, and the sleeve height of the first limit frame strip is greater than the sleeve height of the telescopic frame strip.

[0035] Preferably, the door fence further comprises a stopper, and the stopper is protrudingly mounted on the top of the upper connecting strip and the bottom of the lower connecting strip respectively;

[0036] The limiting member is provided with a limiting surface, and the limiting surface is used to abut against the front side surface of the upper frame bar and the front side surface of the lower frame bar respectively.

[0037] Preferably, the limiting member comprises two connected limiting plates, and the two limiting plates are perpendicular to each other;

[0038] A limiting piece of the limiting member installed on the upper connecting strip is in contact with the top of the upper connecting strip, and another limiting piece of the limiting member installed on the upper connecting strip is used to abut against the front side of the upper frame strip;

[0039] A limiting piece of the limiting member installed on the lower connecting strip is in contact with the bottom of the lower connecting strip, and another limiting piece of the limiting member installed on the lower connecting strip is used to abut against the front side of the lower frame strip.

[0040] The technical solution provided by the utility model may have the following beneficial effects:

[0041] In order to broaden the application scenarios of safety guardrails, the present technical solution proposes a height-adjustable safety guardrail, including a door frame and a door rail, and the first inner frame bar and the second inner frame bar of the door frame, and the telescopic frame bar of the door rail are all telescopic structures connected by sleeves and sleeves, so that the height of the safety guardrail can be adjusted according to the installation scenario to meet the use requirements, and the structure is simple, the installation is convenient, and the transportation is flexible, which can effectively overcome the shortcomings of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The utility model is a structural schematic diagram of a height-adjustable safety guardrail in an extended state.

[0043] Figure 2 The utility model is a structural schematic diagram of a height-adjustable safety guardrail in a retracted state.

[0044] Figure 3 The utility model is a structural schematic diagram of a twisting locking member in an unlocked state in a height-adjustable safety guardrail.

[0045] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0046] Figure 5 It is a rear view of a height-adjustable safety guardrail of the utility model.

[0047] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0048] Figure 7 It is a cross-sectional view of a height-adjustable safety guardrail of the utility model.

[0049] Figure 8 yes Figure 7 Enlarged view of point C in the middle.

[0050] Wherein: door frame 1, upper frame strip 11, first inner frame strip 12, lower frame strip 13, second inner frame strip 14, first outer frame strip 15, second outer frame strip 16, fixed stop block 17, first limit frame strip 18, second limit frame strip 19, door position 101;

[0051] Door rail 2, upper connecting strip 21, telescopic frame strip 22, sleeve 221, sleeve 222, limit block 2221, lower connecting strip 23, middle beam 24, limit piece 25;

[0052] Twist locking piece 3, rotate twisting piece 31, lock sheet 32, lock block 33. DETAILED DESCRIPTION

[0053] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0054] The technical solution provides a height-adjustable safety guardrail, comprising a door frame 1 and a door fence 2, wherein the number of the door fence 2 is one; a door position 101 is reserved inside the door frame 1, the door fence 2 is hinged inside the door frame 1, and the door fence 2 is used to open and close the door position 101;

[0055] The door frame 1 comprises an upper frame strip 11, a first inner frame strip 12, a lower frame strip 13 and a second inner frame strip 14 which are connected end to end in sequence, and the upper frame strip 11, the first inner frame strip 12, the lower frame strip 13 and the second inner frame strip 14 surround the door position 101;

[0056] The door fence 2 includes an upper connecting strip 21, a telescopic frame strip 22 and a lower connecting strip 23. The telescopic frame strip 22 is provided with a plurality of strips, and the plurality of telescopic frame strips 22 are connected between the upper connecting strip 21 and the lower connecting strip 23 in an arranged manner at intervals.

[0057] The first inner frame bar 12, the second inner frame bar 14 and the telescopic frame bar 22 all extend vertically, and the first inner frame bar 12, the second inner frame bar 14 and the telescopic frame bar 22 all include a sleeve 221 and a sleeve 222, the end of the sleeve 222 is connected to the top of the sleeve 221, and the sleeve 222 is installed inside the sleeve 221 so as to be movable up and down;

[0058] The top ends of the sleeves 222 of the first inner frame strip 12 and the second inner frame strip 14 are connected to the upper frame strip 11, and the ends of the sleeves 221 of the first inner frame strip 12 and the second inner frame strip 14 are connected to the lower frame strip 13;

[0059] The top end of the sleeve 222 of the telescopic frame bar 22 is connected to the upper connecting bar 21 , and the end of the sleeve 221 of the telescopic frame bar 22 is connected to the lower connecting bar 23 .

[0060] The height of the safety guardrail in the prior art is generally fixed, which limits the application scenarios of the safety guardrail and cannot be effectively installed and used according to the actual height, which causes certain inconveniences. Moreover, when transporting the safety guardrail, the excessive size of the safety guardrail also makes the transportation process inflexible and inconvenient.

[0061] In order to broaden the application scenarios of safety guardrails, this technical solution proposes a height-adjustable safety guardrail, such as Figure 1-8 As shown, it includes a door frame 1 and a door fence 2, and the first inner frame bar 12 and the second inner frame bar 14 of the door frame 1, and the telescopic frame bar 22 of the door fence 2 are all telescopic structures connected by a sleeve 221 and a sleeve 222, so that the height of the safety guardrail can be adjusted according to the installation scenario (such as the notch height of the installation position, etc.) to meet the use requirements, and the structure is simple, the installation is convenient, and the transportation is flexible, which can effectively overcome the shortcomings of the prior art.

[0062] To further explain, the door rail 2 further includes a middle beam 24 , which is located in the middle of the door rail 2 , and the sleeves 221 of the plurality of telescopic frame strips 22 are connected between the middle beam 24 and the lower connecting strip 23 in an alternately arranged manner.

[0063] As a preferred embodiment of the above embodiment, the present solution further provides a center beam 24 in the middle of the door rail 2 , which can improve the structural strength of the door rail 2 without affecting the telescopic function of the telescopic frame strip 22 .

[0064] Further, it further comprises a twist locking member 3, wherein the twist locking member 3 is rotatably mounted on the edge of the middle beam 24;

[0065] When the twist locking member 3 is in an unlocked state, the door rail 2 rotates relative to the door frame 1;

[0066] When the twist locking member 3 is in a locked state, the door frame 1 and the door rail 2 are relatively stationary.

[0067] As a better embodiment of the above, the present solution further provides a twisting locking member 3 in the middle beam 24 to realize the opening and closing of the door rail 2. Specifically, Figure 6 FIG. 2 is a schematic diagram showing a structure in which the twist locking member 3 is in a locked state. Figure 4 The figure shows a schematic structural diagram of the twist locking member 3 in an unlocked state.

[0068] To further illustrate, the twisting locking member 3 includes a rotating twisting member 31, a locking piece 32 and a locking block 33;

[0069] The rotating torsion member 31 is rotatably mounted on the front side of the middle beam 24, and the locking plate 32 is rotatably mounted on the rear side of the middle beam 24. The rotating torsion member 31 and the locking plate 32 are connected, and the rotation of the rotating torsion member 31 drives the rotation of the locking plate 32.

[0070] The locking block 33 is protrudingly mounted on the rear side of the door frame 1; the locking plate 32 is provided with a locking groove, and the locking groove is used to accommodate the locking block 33;

[0071] When the twist locking member 3 is in the unlocked state, the movable end of the locking piece 32 abuts against the middle beam 24;

[0072] When the twist locking member 3 is in a locked state, the movable end of the locking piece 32 abuts against the door frame 1 , and the locking block 33 is located inside the locking groove.

[0073] In a preferred embodiment of the present technical solution, the twisting locking member 3 includes a rotating twisting member 31, a locking plate 32 and a locking block 33, and the rotation of the rotating twisting member 31 drives the rotation of the locking plate 32, thereby realizing the unlocking and locking of the twisting locking member 3, with a simple structure and reliable performance. Figure 4 , 6 and 8.

[0074] Specifically, when the twisting locking piece 3 is in the unlocked state, the movable end of the locking plate 32 abuts against the central beam 24, so that the door rail 2 can rotate freely; when the twisting locking piece 3 is in the locked state, the movable end of the locking plate 32 abuts against the door frame 1, and the locking plate 32 buckles the locking block 33 through the locking groove, thereby achieving the locking of the safety guardrail.

[0075] To further explain, a limiting block 2221 is protrudingly provided on the end side wall of the sleeve 222 of the first inner frame strip 12 and / or the second inner frame strip 14 , and the limiting block 2221 is located inside the sleeve 221 corresponding to the sleeve 222 .

[0076] In order to prevent the first inner frame bar 12, the second inner frame bar 14 and the telescopic frame bar 22 from separating from the sleeve 222 and the sleeve 221 during the telescopic process, the present invention further provides a limit block 2221 protruding from the end side wall of the sleeve 222 of the first inner frame bar 12 and / or the second inner frame bar 14, such as Figure 8 shown.

[0077] Further, the door frame 1 further includes a first outer frame bar 15 and a second outer frame bar 16, the first outer frame bar 15 and the second outer frame bar 16 are both vertically extended and connected between the upper frame bar 11 and the lower frame bar 13, and the first outer frame bar 15 is located on the outer side of the first inner frame bar 12, and the second outer frame bar 16 is located on the outer side of the second inner frame bar 14;

[0078] The first outer frame strip 15 and the second outer frame strip 16 each include a sleeve 221 and a sleeve 222, the end of the sleeve 222 is connected to the top of the sleeve 221, and the sleeve 222 is installed inside the sleeve 221 so as to be movable up and down;

[0079] The top ends of the sleeves 222 of the first outer frame strip 15 and the second outer frame strip 16 are connected to the upper frame strip 11, and the ends of the sleeves 221 of the first outer frame strip 15 and the second outer frame strip 16 are connected to the lower frame strip 13;

[0080] The cross-sectional shapes of the first inner frame strip 12 and the second inner frame strip 14 are both elliptical;

[0081] The cross-sectional shapes of the first outer frame strip 15 and the second outer frame strip 16 are both circular.

[0082] In order to further improve the structural strength of the door frame 1, the present solution further adds a first outer frame bar 15 and a second outer frame bar 16 which also have a telescopic structure in the door frame 1, and optimizes the cross-sectional shapes of the inner frame bars (12, 14) and the outer frame bars (15, 16).

[0083] Further, the door frame 1 further includes a fixed stop block 17, and four fixed stop blocks 17 are provided;

[0084] The two fixed blocks 17 are protrudingly installed at both ends of the upper frame bar 11 so as to be horizontally movable;

[0085] The remaining two fixed blocks 17 are installed on both ends of the lower frame bar 13 in a horizontally movable manner;

[0086] The outer end surface of the fixed abutment block 17 is used to abut against the wall.

[0087] Furthermore, in order to ensure the effective installation of the safety guardrail in various application scenarios, the present solution also provides horizontally movable fixed blocks 17 at the ends of the upper frame bar 11 and the lower frame bar 13. The installation of the safety guardrail can be achieved by abutting the outer end surface of the fixed block 17 against the wall. The structure is simple and the installation is convenient.

[0088] Further, the door frame 1 further includes a first limiting frame strip 18 and a second limiting frame strip 19, the first limiting frame strip 18 and the second limiting frame strip 19 are both vertically extended and connected between the upper frame strip 11 and the lower frame strip 13, and the first limiting frame strip 18 is located on the outside of the first outer frame strip 15, and the second limiting frame strip 19 is located on the outside of the second outer frame strip 16;

[0089] The first limiting frame strip 18 and the second limiting frame strip 19 each include a sleeve 221 and a sleeve 222, the end of the sleeve 222 is connected to the top of the sleeve 221, and the sleeve 222 is installed inside the sleeve 221 so as to be movable up and down;

[0090] The top ends of the sleeves 222 of the first limiting frame strip 18 and the second limiting frame strip 19 are connected to the upper frame strip 11, and the ends of the sleeves 221 of the first limiting frame strip 18 and the second limiting frame strip 19 are connected to the lower frame strip 13;

[0091] The height of the sleeve 221 of the first limiting frame strip 18 is equal to the height of the sleeve 221 of the second limiting frame strip 19, and the height of the sleeve 221 of the first limiting frame strip 18 is greater than the height of the sleeve 221 of the first outer frame strip 15 and the second outer frame strip 16, the height of the sleeve 221 of the first limiting frame strip 18 is greater than the height of the sleeve 221 of the first inner frame strip 12 and the second inner frame strip 14, and the height of the sleeve 221 of the first limiting frame strip 18 is greater than the height of the sleeve 221 of the telescopic frame strip 22.

[0092] In order to further improve the structural strength of the door frame 1, the present solution further adds a first limit frame bar 18 and a second limit frame bar 19 which also have a telescopic structure in the door frame 1. At the same time, the height of the sleeve 221 in the limit frame bars (18, 19) is optimized to achieve the contraction range of the telescopic structure in the safety guardrail.

[0093] Further, the door fence 2 further includes a stopper 25, and the stopper 25 is protrudingly mounted on the top of the upper connecting strip 21 and the bottom of the lower connecting strip 23;

[0094] The limiting member 25 is provided with a limiting surface, and the limiting surface is used to abut against the front side surface of the upper frame bar 11 and the front side surface of the lower frame bar 13 respectively.

[0095] Furthermore, the door rail 2 of the present solution is also provided with a limiting member 25, which can limit the swinging direction and range of the door rail 2 to achieve the opening and closing of the doorway 101.

[0096] Further, the limiting member 25 includes two connected limiting plates, and the two limiting plates are perpendicular to each other;

[0097] A limiting piece of the limiting member 25 installed on the upper connecting strip 21 is attached to the top of the upper connecting strip 21, and another limiting piece of the limiting member 25 installed on the upper connecting strip 21 is used to abut against the front side of the upper frame strip 11;

[0098] One limiting piece of the limiting member 25 installed on the lower connecting bar 23 is in contact with the bottom of the lower connecting bar 23 , and another limiting piece of the limiting member 25 installed on the lower connecting bar 23 is used to abut against the front side of the lower frame bar 13 .

[0099] As a preferred embodiment of the above-mentioned embodiment, the limiting member 25 of the present solution is L-shaped, has a simple structure, and reliable performance, which is conducive to ensuring that it effectively limits the swing direction and range of the door rail 2.

[0100] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0101] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0102] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0103] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0104] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0105] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0106] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A height-adjustable safety guardrail, characterized in that: The door frame comprises a door frame and a door fence, wherein the number of the door fence is one; a door position is reserved inside the door frame, the door fence is hinged inside the door frame, and the door fence is used to open and close the door position; The door frame comprises an upper frame bar, a first inner frame bar, a lower frame bar and a second inner frame bar which are connected end to end in sequence, and the upper frame bar, the first inner frame bar, the lower frame bar and the second inner frame bar surround the door position; The door rail comprises an upper connecting bar, a telescopic frame bar and a lower connecting bar, wherein a plurality of telescopic frame bars are provided, and the plurality of telescopic frame bars are connected between the upper connecting bar and the lower connecting bar in an arranged manner at intervals; The first inner frame bar, the second inner frame bar and the telescopic frame bar all extend vertically, and the first inner frame bar, the second inner frame bar and the telescopic frame bar all include a sleeve and a sleeve, the end of the sleeve is connected to the top of the sleeve, and the sleeve is installed inside the sleeve so as to be movable up and down; The top ends of the sleeves of the first inner frame bar and the second inner frame bar are connected to the upper frame bar, and the ends of the sleeves of the first inner frame bar and the second inner frame bar are connected to the lower frame bar; The top end of the sleeve of the telescopic frame bar is connected to the upper connecting bar, and the end of the sleeve of the telescopic frame bar is connected to the lower connecting bar.

2. A height-adjustable safety guardrail according to claim 1, characterized in that: The door rail also includes a middle beam, which is located in the middle of the door rail, and the sleeves of a plurality of telescopic frame strips are connected between the middle beam and the lower connecting strips in an arranged manner at intervals.

3. A height-adjustable safety guardrail according to claim 2, characterized in that: Also included is a twist locking member, the twist locking member being rotatably mounted on the edge of the center beam; When the twist locking member is in an unlocked state, the door rail rotates relative to the door frame; When the twist locking member is in a locked state, the door frame and the door rail are relatively stationary.

4. The height-adjustable safety guardrail according to claim 3, characterized in that: The twisting locking member comprises a rotating twisting member, a locking sheet and a locking block; The rotating torsion member is rotatably mounted on the front side of the middle beam, and the locking plate is rotatably mounted on the rear side of the middle beam. The rotating torsion member and the locking plate are connected, and the rotation of the rotating torsion member drives the rotation of the locking plate. The locking block is protrudingly mounted on the rear side of the door frame; the locking piece is provided with a locking groove, and the locking groove is used to accommodate the locking block; When the twist locking member is in an unlocked state, the movable end of the locking piece abuts against the middle beam; When the twist locking member is in a locked state, the movable end of the locking sheet abuts against the door frame, and the locking block is located inside the locking groove.

5. The height-adjustable safety guardrail according to claim 1, characterized in that: A limiting block is protrudingly provided on the end side wall of the sleeve of the first inner frame strip and / or the second inner frame strip, and the limiting block is located inside the sleeve corresponding to the sleeve.

6. The height-adjustable safety guardrail according to claim 1, characterized in that: The door frame further includes a first outer frame bar and a second outer frame bar, wherein the first outer frame bar and the second outer frame bar are both vertically extended and connected between the upper frame bar and the lower frame bar, and the first outer frame bar is located outside the first inner frame bar, and the second outer frame bar is located outside the second inner frame bar; The first outer frame bar and the second outer frame bar each include a sleeve and a sleeve, the end of the sleeve is connected to the top of the sleeve, and the sleeve is installed inside the sleeve so as to be movable up and down; The top ends of the sleeves of the first outer frame bar and the second outer frame bar are connected to the upper frame bar, and the ends of the sleeves of the first outer frame bar and the second outer frame bar are connected to the lower frame bar; The cross-sectional shapes of the first inner frame strip and the second inner frame strip are both elliptical; The cross-sectional shapes of the first outer frame strip and the second outer frame strip are both circular.

7. The height-adjustable safety guardrail according to claim 6, characterized in that: The door frame further includes fixed abutments, and four fixed abutments are provided; The two fixed blocks are protrudingly installed at the two ends of the upper frame bar so as to be horizontally movable; The remaining two fixed blocks are installed on both ends of the lower frame bar in a horizontally movable manner; The outer end surface of the fixed abutment block is used to abut against the wall.

8. The height-adjustable safety guardrail according to claim 7, characterized in that: The door frame further includes a first limiting frame bar and a second limiting frame bar, wherein the first limiting frame bar and the second limiting frame bar are both vertically extended and connected between the upper frame bar and the lower frame bar, and the first limiting frame bar is located outside the first outer frame bar, and the second limiting frame bar is located outside the second outer frame bar; The first limiting frame bar and the second limiting frame bar both include a sleeve and a sleeve, the end of the sleeve is connected to the top of the sleeve, and the sleeve is installed inside the sleeve so as to be movable up and down; The top ends of the sleeves of the first limiting frame bar and the second limiting frame bar are connected to the upper frame bar, and the ends of the sleeves of the first limiting frame bar and the second limiting frame bar are connected to the lower frame bar; The sleeve height of the first limit frame strip is equal to the sleeve height of the second limit frame strip, and the sleeve height of the first limit frame strip is greater than the sleeve height of the first outer frame strip and the second outer frame strip, the sleeve height of the first limit frame strip is greater than the sleeve height of the first inner frame strip and the second inner frame strip, and the sleeve height of the first limit frame strip is greater than the sleeve height of the telescopic frame strip.

9. The height-adjustable safety guardrail according to claim 1, characterized in that: The gate fence also includes a stopper, which is protrudingly mounted on the top of the upper connecting strip and the bottom of the lower connecting strip respectively; The limiting member is provided with a limiting surface, and the limiting surface is used to abut against the front side surface of the upper frame bar and the front side surface of the lower frame bar respectively.

10. The height-adjustable safety guardrail according to claim 9, characterized in that: The limiting member includes two connected limiting plates, and the two limiting plates are perpendicular to each other; A limiting piece of the limiting member installed on the upper connecting strip is in contact with the top of the upper connecting strip, and another limiting piece of the limiting member installed on the upper connecting strip is used to abut against the front side of the upper frame strip; A limiting piece of the limiting member installed on the lower connecting strip is in contact with the bottom of the lower connecting strip, and another limiting piece of the limiting member installed on the lower connecting strip is used to abut against the front side of the lower frame strip.

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