A new small double-flange telescopic device

Abstract

The application discloses a novel small double-flange expander, and relates to the technical field of pipeline construction. The novel small double-flange expander comprises an expander cylinder I and an expander cylinder II, the expander cylinder II is located at the top of the expander cylinder I and movably sleeved in the interior of the expander cylinder I, the bottom of the expander cylinder I and the top of the expander cylinder II are both fixed with flange plates, a plurality of connecting holes are formed in the flange plates, and an automatic positioning device is arranged at the top of the flange plate fixed with the expander cylinder I. The novel small double-flange expander is moved when the threaded connecting pieces are installed on the two flange plates, at the moment, the contact ring drives the movable positioning block to be pushed into the two cooperating blocks through the driving rod and the driving block, so that the fixation of the expander cylinder II is realized, the stable connection between the expander cylinder I and the expander cylinder II is realized, the connection does not need manual operation, the time consumed for positioning is reduced, and the installation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline construction, in particular to a novel small double-flange expansion joint. Background Art

[0002] Pipeline construction refers to the process of constructing pipelines underground or inside buildings, which includes the laying and maintenance of pipelines. After a period of use, pipelines are prone to breakage due to corrosion or wear. At this time, the two broken pipelines need to be connected. There are many ways to connect broken pipelines, such as installing two flanges at the broken pipe, and then using an expansion joint with flanges at both ends to connect the two flanges, thereby achieving repair of the broken pipe.

[0003] Although this method can protect the broken part of the pipeline, this expansion joint generally requires the use of a positioning device to position the length to avoid instability of the pipeline. The positioning device is generally a positioning buckle or directly uses a threaded rod for locking. However, both methods require manual control and have a low degree of automation. It is not easy to operate when installing the expansion joint in a relatively narrow space, and using the self-locking characteristics of the threaded rod for locking will consume a lot of time, affecting the installation efficiency. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a novel small double-flange expansion joint, which solves the problems raised in the above background technology.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: a new type of small double-flange telescopic device, including telescopic cylinder one and telescopic cylinder two, the telescopic cylinder two is located at the top of the telescopic cylinder one and movably sleeved inside the telescopic cylinder one, the bottom of the telescopic cylinder one and the top of the telescopic cylinder two are fixed with flange plates, a plurality of connecting holes are opened on the flange plate, and an automatic positioning device is provided on the top of the flange plate fixed to the telescopic cylinder one, the automatic positioning device includes a driving rod, a driving block and a movable positioning block, the movable positioning block is elastically telescopic, the bottom end of the driving rod is fixed with a contact ring, the bottom of the contact ring contacts with the top of the flange plate, the top end of the driving rod is fixed with the driving block, the driving block is located at the bottom of one side of the movable positioning block, the movable positioning block movably passes through the telescopic cylinder one, and a plurality of matching blocks are fixed on the outer wall of the telescopic cylinder two; by arranging the contact ring, the two flange plates can be aligned When the threaded connection is installed, movement occurs. At this time, the contact ring pushes the movable positioning block between the two matching blocks through the driving rod and the driving block, thereby fixing the telescopic cylinder 2, so that the telescopic cylinder 1 and the telescopic cylinder 2 are stably connected, and the connection does not require manual operation, which reduces the time required for positioning and improves installation efficiency. A protective shell is fixed to the outer wall of the telescopic cylinder 1, and the top of the driving rod is located inside the protective shell. At the same time, an elastic part is provided between the top of the driving rod and the top of the inner wall of the protective shell. The elastic part can be used for the elastic support effect of the driving rod to ensure the stability of the driving rod when it is not under force. The driving block is close to the side and the top of the telescopic cylinder 1 and is arranged at an inclined chamfer. A connecting spring is provided between the movable positioning block and the telescopic cylinder 1; by setting the connecting spring, not only can the movable positioning block be supported and reset, but also the movable positioning block can be prevented from separating from the telescopic cylinder 1.

[0006] The top of the protective shell is provided with a stabilizing holding device, and the stabilizing holding device includes a rotating control plate, a pushing strip and a mounting plate, the rotating control plate passes through the top of the protective shell and is rotatably connected to the top of the protective shell, one end of the pushing strip contacts one side of the top of the rotating control plate, and the other end is fixed to the bottom of one end of the mounting plate, the other end of the mounting plate is hingedly mounted on the bottom of the flange, and the mounting plate is located at the bottom of a positioning hole of the flange, one side of the bottom of the rotating control plate contacts one side of the vertical plate, and the bottom of the vertical plate is fixed to the top of the movable positioning block; by arranging the mounting plate, the flange on the telescopic cylinder second is rotated when the threaded connection is installed, at this time, the mounting plate pushes the rotating control plate to rotate by the pushing strip, the bottom end of the rotating control plate leaves the vertical plate, the movable positioning block can move and disengage from the matching block, at this time, the telescopic effect between the telescopic cylinder one and the telescopic cylinder two can be performed, avoiding damage to the telescopic cylinder when the telescopic device is not installed. In order to ensure that the pushing strip can push the rotating control plate to rotate, the pushing strip is arranged in an arc shape, and the center of the pushing strip is located at the hinge of the mounting plate and the flange, and the movable positioning block is located between the two matching blocks.

[0007] Preferably, the elastic member between the top end of the driving rod and the top of the inner wall of the protective shell is an arc-shaped spring piece, and the arc-shaped spring piece protrudes in the direction of the movable positioning block, and the bottom end of the rotating control plate is fixed to one end of the elastic connecting plate on the side away from the vertical plate, and the other end of the elastic connecting plate is fixed to the center of the protruding side of the arc-shaped spring piece; by arranging the elastic connecting plate, the arc-shaped spring piece can be pushed to deform when the rotating control plate is pushed to rotate by the push bar. At this time, the distance between the two ends of the arc-shaped spring piece increases, and the bottom end of the arc-shaped spring piece pushes the driving rod downward, thereby preventing the driving rod from moving upward, and preventing the driving rod from being affected by external force, causing the movable positioning block to move between the two matching blocks, resulting in the inability of telescopic cylinder one and telescopic cylinder two to be telescopic.

[0008] Preferably, an auxiliary stabilizing device is provided inside the telescopic cylinder one, and the auxiliary stabilizing device includes a limit rod and a resistance-increasing arc piece, the limit rod movably passes through the bottom of the telescopic cylinder two, and the bottom end of the limit rod is fixed to the bottom of the inner wall of the telescopic cylinder one, both ends of the resistance-increasing arc piece are fixed on the limit rod, and one resistance-increasing arc piece is located between two matching blocks; by providing the limit rod, a limiting effect can be produced on the movement of the telescopic cylinder two, thereby preventing the telescopic cylinder two and the telescopic cylinder one from rotating relative to each other, and during the relative movement of the telescopic cylinder two and the telescopic cylinder one, the matching block will squeeze the resistance-increasing arc piece, and when the telescopic cylinder one and the telescopic cylinder two stop moving relative to each other, the resistance-increasing arc piece will be located between the two matching blocks, thereby playing a role The auxiliary fixing effect is that the resistance-increasing arc piece is made of elastic metal material, and a liquid storage bag is arranged between the concave side of the resistance-increasing arc piece and the limit rod. The liquid storage bag is made of elastic rubber material, and the interior of the liquid storage bag is filled with non-Newtonian fluid; when the telescopic cylinder 1 and the telescopic cylinder 2 move rapidly relative to each other, the non-Newtonian fluid in the liquid storage bag solidifies and blocks the deformation of the resistance-increasing arc piece, thereby reducing the impact force on the movable positioning block when the telescopic cylinder 1 and the telescopic cylinder 2 move rapidly relative to each other. When the telescopic cylinder 1 and the telescopic cylinder 2 are manually controlled to extend and retract normally, the movement between the telescopic cylinder 1 and the telescopic cylinder 2 is relatively slow, and the non-Newtonian fluid in the liquid storage bag is in liquid form, which will not prevent the telescopic cylinder 1 and the telescopic cylinder 2 from extending and retracting.

[0009] The present invention provides a novel small double-flange expansion joint. It has the following beneficial effects:

[0010] (1) This new type of small double-flange expansion joint can move when threaded connectors are installed on both flanges by setting a contact ring. At this time, the contact ring pushes the movable positioning block between the two matching blocks through the driving rod and the driving block, thereby fixing the telescopic cylinder 2, so that the telescopic cylinder 1 and the telescopic cylinder 2 are stably connected. The connection does not require manual operation, which reduces the time required for positioning and improves installation efficiency.

[0011] (2) The new small double-flange telescopic device can rotate when the threaded connector is installed on the flange of the telescopic tube 2 by setting a mounting plate. At this time, the mounting plate pushes the rotation control plate to rotate through the push bar. The bottom end of the rotation control plate leaves the vertical plate, and the movable positioning block can move and disengage from the matching block. Only then can the telescopic effect between the telescopic tube 1 and the telescopic tube 2 be achieved, avoiding the damage of the telescopic device caused by movement when the telescopic device is not installed.

[0012] (3) This new type of small double-flange telescopic device can push the arc-shaped spring piece to deform when the rotating control plate is pushed by the push bar by setting an elastic connecting plate. At this time, the distance between the two ends of the arc-shaped spring piece increases, and the bottom end of the arc-shaped spring piece pushes the driving rod downward, thereby preventing the driving rod from moving upward and preventing the driving rod from being affected by external forces, causing the movable positioning block to move between the two matching blocks, resulting in the telescopic tube 1 and the telescopic tube 2 being unable to telescope.

[0013] (4) This new type of small double-flange telescopic joint can limit the movement of the telescopic cylinder 2 by setting a limit rod, thereby preventing the telescopic cylinder 2 and the telescopic cylinder 1 from rotating relative to each other. In addition, during the relative movement of the telescopic cylinder 2 and the telescopic cylinder 1, the matching block will squeeze the resistance-increasing arc piece. When the telescopic cylinder 1 and the telescopic cylinder 2 stop moving relative to each other, the resistance-increasing arc piece will be located between the two matching blocks, thereby playing an auxiliary fixing effect.

[0014] (5) This new type of small double-flange telescopic device, when the telescopic tube 1 and the telescopic tube 2 move rapidly relative to each other, the non-Newtonian fluid in the liquid storage bag solidifies and blocks the deformation of the resistance-increasing arc piece, thereby reducing the impact force on the movable positioning block when the telescopic tube 1 and the telescopic tube 2 move rapidly relative to each other. When the telescopic tube 1 and the telescopic tube 2 are manually controlled to retract normally, the movement between the telescopic tube 1 and the telescopic tube 2 is relatively slow, and the non-Newtonian fluid in the liquid storage bag is in liquid form and will not prevent the telescopic tube 1 and the telescopic tube 2 from retracting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a half-section view of the whole of the present invention;

[0017] Figure 3 A half-section view of the automatic positioning device of the present invention;

[0018] Figure 4 For the present invention Figure 2 A schematic diagram of the enlarged structure of part A;

[0019] Figure 5 For the present invention Figure 2 The enlarged structural diagram of part B in the middle;

[0020] Figure 6This is a schematic structural diagram of the stabilizing and holding device of the present invention;

[0021] Figure 7 Schematic diagram of the structure of the auxiliary stabilization device in the present invention.

[0022] In the figure: 1. Telescopic cylinder 1; 2. Telescopic cylinder 2; 21. Matching block; 3. Flange; 4. Automatic positioning device; 41. Drive rod; 411. Contact ring; 412. Arc-shaped spring piece; 42. Drive block; 43. Movable positioning block; 431. Vertical plate; 5. Protective shell; 6. Stable holding device; 61. Rotation control plate; 611. Elastic connecting plate; 62. Push strip; 63. Mounting plate; 7. Auxiliary stabilizing device; 71. Limit rod; 72. Resistance-increasing arc-shaped piece; 8. Liquid storage capsule. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-7 The present invention provides a technical solution: a new type of small double-flange telescopic device, including a telescopic cylinder 1 and a telescopic cylinder 2, the telescopic cylinder 2 is located at the top of the telescopic cylinder 1 and is movably connected to the inside of the telescopic cylinder 1, the bottom of the telescopic cylinder 1 and the top of the telescopic cylinder 2 are fixed with flanges 3, the flanges 3 are provided with multiple connection holes, and the top of the flange 3 fixed to the telescopic cylinder 1 is provided with an automatic positioning device 4, the automatic positioning device 4 includes a driving rod 41, a driving block 42 and a movable positioning block 43, the movable positioning block 43 is elastically retractable, the bottom end of the driving rod 41 is fixed with a contact ring 411, and the bottom of the contact ring 411 contacts the top of the flange 3, The top of the driving rod 41 is fixed to the driving block 42, and the driving block 42 is located at the bottom of one side of the movable positioning block 43. The movable positioning block 43 movably penetrates the telescopic cylinder 1, and a plurality of matching blocks 21 are fixed to the outer wall of the telescopic cylinder 2; by setting the contact ring 411, movement can be generated when the threaded connectors are installed on both flanges 3. At this time, the contact ring 411 pushes the movable positioning block 43 between the two matching blocks 21 through the driving rod 41 and the driving block 42, thereby fixing the telescopic cylinder 2 2, so that the telescopic cylinder 1 and the telescopic cylinder 2 2 are stably connected, and the connection does not require manual operation, which reduces the time required for positioning and improves installation efficiency.

[0025] Preferably, in this embodiment, a protective shell 5 is fixed to the outer wall of the telescopic cylinder 1, and the top of the driving rod 41 is located inside the protective shell 5. At the same time, an elastic member is provided between the top of the driving rod 41 and the top of the inner wall of the protective shell 5. The elastic member can be used for the elastic support effect of the driving rod 41 to ensure the stability of the driving rod 41 when it is not subject to force.

[0026] Preferably, in this embodiment, the driving block 42 is arranged with an inclined chamfer between the side close to the telescopic cylinder 1 and the top, and a connecting spring is provided between the movable positioning block 43 and the telescopic cylinder 1; by providing the connecting spring, not only can the movable positioning block 43 be supported and reset, but also the movable positioning block 43 can be prevented from separating from the telescopic cylinder 1.

[0027] Preferably, in this embodiment, a stabilizing holding device 6 is provided on the top of the protective shell 5, and the stabilizing holding device 6 includes a rotation control plate 61, a push bar 62 and a mounting plate 63. The rotation control plate 61 passes through the top of the protective shell 5 and is rotatably connected to the top of the protective shell 5. One end of the push bar 62 contacts one side of the top of the rotation control plate 61, and the other end is fixed to the bottom of one end of the mounting plate 63. The other end of the mounting plate 63 is hingedly mounted on the bottom of the flange 3, and the mounting plate 63 is located at the bottom of a positioning hole of the flange 3. One side of the bottom end of the rotation control plate 61 is in contact with the vertical The bottom of the plate 431 is in contact with the top of the movable positioning block 43. By setting the mounting plate 63, the flange 3 on the telescopic cylinder 2 can be rotated when the threaded connector is installed. At this time, the mounting plate 63 pushes the rotation control plate 61 to rotate through the push bar 62. The bottom end of the rotation control plate 61 leaves the vertical plate 431, and the movable positioning block 43 can move and disengage from the matching block 21. Only then can the telescopic effect between the telescopic cylinder 1 and the telescopic cylinder 2 be performed, avoiding the telescopic device from being damaged due to movement when the telescopic device is not installed.

[0028] Preferably, in this embodiment, in order to ensure that the push bar 62 can push the rotating control plate 61 to rotate, the push bar 62 is set in an arc shape, and the center of the push bar 62 is located at the hinge between the mounting plate 63 and the flange 3, and the movable positioning block 43 is located between the two mating blocks 21.

[0029] Preferably, in this embodiment, the elastic member between the top of the driving rod 41 and the top of the inner wall of the protective shell 5 is an arc-shaped spring piece 412, and the arc-shaped spring piece 412 protrudes toward the direction of the movable positioning block 43, and the bottom end of the rotating control plate 61 is fixed to one end of the elastic connecting plate 611 on the side away from the vertical plate 431, and the other end of the elastic connecting plate 611 is fixed to the center of the protruding side of the arc-shaped spring piece 412; by setting the elastic connecting plate 611, the arc-shaped spring piece 412 can be pushed to deform when the rotating control plate 61 is pushed to rotate by the push bar 62. At this time, the distance between the two ends of the arc-shaped spring piece 412 increases, and the bottom end of the arc-shaped spring piece 412 pushes the driving rod 41 downward, thereby preventing the driving rod 41 from moving upward, and preventing the driving rod 41 from being affected by external force, causing the movable positioning block 43 to move between the two matching blocks 21, resulting in the telescopic cylinder 1 and the telescopic cylinder 2 2 being unable to be telescoped.

[0030] Preferably, in this embodiment, an auxiliary stabilizing device 7 is provided inside the telescopic cylinder 1, and the auxiliary stabilizing device 7 includes a limiting rod 71 and a resistance-increasing arc piece 72. The limiting rod 71 movably passes through the bottom of the telescopic cylinder 2, and the bottom end of the limiting rod 71 is fixed to the bottom of the inner wall of the telescopic cylinder 1, and both ends of the resistance-increasing arc piece 72 are fixed on the limiting rod 71, and one resistance-increasing arc piece 72 is located between the two matching blocks 21; by providing the limiting rod 71, a limiting effect can be produced on the movement of the telescopic cylinder 2, thereby preventing the telescopic cylinder 22 and the telescopic cylinder 1 from rotating relative to each other, and during the relative movement of the telescopic cylinder 22 and the telescopic cylinder 1, the matching block 21 will squeeze the resistance-increasing arc piece 72. When the telescopic cylinder 1 and the telescopic cylinder 22 stop moving relative to each other, the resistance-increasing arc piece 72 will be located between the two matching blocks 21, thereby playing an auxiliary fixing effect.

[0031] Preferably, in this embodiment, the resistance-increasing arc piece 72 is made of elastic metal, and a liquid storage capsule 8 is arranged between the concave side of the resistance-increasing arc piece 72 and the limit rod 71. The liquid storage capsule 8 is made of elastic rubber, and the interior of the liquid storage capsule 8 is filled with non-Newtonian fluid; when the telescopic cylinder 1 and the telescopic cylinder 2 2 move rapidly relative to each other, the non-Newtonian fluid in the liquid storage capsule 8 solidifies and blocks the deformation of the resistance-increasing arc piece 72, thereby reducing the impact force exerted on the movable positioning block 43 when the telescopic cylinder 1 and the telescopic cylinder 2 2 move rapidly relative to each other. When the telescopic cylinder 1 and the telescopic cylinder 2 2 are manually controlled to extend and retract normally, the movement between the telescopic cylinder 1 and the telescopic cylinder 2 2 is relatively slow, and the non-Newtonian fluid in the liquid storage capsule 8 is in liquid form, which will not prevent the telescopic cylinder 1 and the telescopic cylinder 2 2 from extending and retracting.

[0032] When the cam 2 is tightened, the flange 3 on the second telescopic cylinder 2 is connected to the flange on the pipe, and the threaded rod is passed through the connecting hole of the flange 3 and the flange on the pipe, and then the threaded rod is fixed with a nut, thereby achieving the fixing effect between the second telescopic cylinder 2 and the pipe, and then the telescopic cylinder 2 is manually controlled to move inside the telescopic cylinder 1 to achieve the length control of the telescope. After the telescopic cylinder 1 and the second telescopic cylinder 2 are extended and retracted, the flange 3 on the telescopic cylinder 1 is connected to the flange on the pipe using the above method, and the contact ring 411 is manually lifted before the connection, so that the contact ring 411 and the flange 3 clamp the nut to improve the stability of the nut. After that, the threaded rod passes through the nut and pushes the contact ring 411 and the driving rod 41 to rise. The inclined surface of the driving block 42 contacts the bottom of the movable positioning block 43 and generates a lateral thrust on the movable positioning block 43, thereby causing the movable positioning block 43 to move between the two matching blocks 21 to achieve the positioning effect between the telescopic cylinder 1 and the second telescopic cylinder 2.

[0033] Before the flange 3 on the telescopic cylinder 2 is connected to the pipe, the movable positioning block 43 is located between the two matching blocks 21 to prevent the telescopic cylinder 2 and the telescopic cylinder 1 from generating relative displacement. After the flange 3 on the telescopic cylinder 2 is connected to the pipe, the threaded rod passing through the connecting hole on the flange 3 will push the mounting plate 63 to rotate, and the mounting plate 63 drives the push bar 62 to rotate, and the push bar 62 drives the rotation control plate 61 to rotate, and the bottom end of the rotation control plate 61 is separated from the vertical plate 431, and the movable positioning block 43 is reset under the action of the spring force and leaves the two matching blocks 21. The position between the two ends of the driving rod 41 is increased, thereby achieving the overall length adjustment between the telescopic cylinder 1 and the telescopic cylinder 2; and when the rotating control plate 61 is pushed and rotated by the push bar 62, the rotating control plate 61 drives the elastic connecting plate 611 to move and squeeze the arc-shaped spring piece 412, the arc-shaped spring piece 412 is deformed, and the distance between the two ends tends to increase. The bottom end of the arc-shaped spring piece 412 will generate a downward thrust on the top end of the driving rod 41, thereby improving the stability of the driving rod 41 and preventing the driving rod 41 from moving up and down and causing the movable positioning block 43 to move and be inserted between the two matching blocks 21;

[0034] After the adjustment between the telescopic cylinder 1 and the telescopic cylinder 2, the resistance-increasing arc piece 72 is located between the two matching blocks 21. When the telescopic cylinder 1 and the telescopic cylinder 2 are subjected to a slow water flow, the resistance-increasing arc piece 72 will contact the matching block 21 and a blocking effect will also be generated between the movable positioning block 43 and the matching block 21 to improve the stability of the telescopic cylinder 1 and the telescopic cylinder 2. When the telescopic cylinder 1 and the telescopic cylinder 2 are subjected to a relatively fast water flow, the relative movement between the telescopic cylinder 1 and the telescopic cylinder 2 is relatively fast, so the thrust of the matching block 21 on the resistance-increasing arc piece 72 is also relatively fast, and the inside of the liquid storage capsule 8 The non-Newtonian fluid solidifies and blocks the deformation of the resistance-increasing arc piece 72, thereby preventing the matching block 21 and the movable positioning block 43 from having a large impact when the water flow suddenly becomes larger, thereby preventing the movable positioning block 43 or the matching block 21 from being damaged, so as to improve the service life of the matching block 21 and the movable positioning block 43. When the length of the telescopic cylinder 1 and the telescopic cylinder 2 are normally adjusted, the adjustment force is relatively slow, so the non-Newtonian fluid inside the liquid storage capsule 8 is liquid, and the liquid storage capsule 8 can be deformed freely, so it will not affect the deformation of the resistance-increasing arc piece 72, and thus will not affect the adjustment of the telescopic cylinder 1 and the telescopic cylinder 2.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A novel small double-flange expansion joint, comprising a first expansion joint (1) and a second expansion joint (2), characterized in that: The telescopic cylinder 2 (2) is located at the top of the telescopic cylinder 1 (1) and is movably sleeved inside the telescopic cylinder 1 (1). The bottom of the telescopic cylinder 1 (1) and the top of the telescopic cylinder 2 (2) are both fixed with flanges (3), and a plurality of connection holes are provided on the flange (3). The top of the flange (3) fixed to the telescopic cylinder 1 (1) is provided with an automatic positioning device (4), and the automatic positioning device (4) includes a driving rod (41), a driving block (42) and a movable positioning block (43). The bottom end of the driving rod (41) is fixed with a contact ring (411), and the bottom of the contact ring (411) contacts the top of the flange (3). The top end of the driving rod (41) is fixed with the driving block (42), and the driving block (42) is located at the bottom of one side of the movable positioning block (43). The movable positioning block (43) movably passes through the telescopic cylinder 1 (1). The outer wall of the telescopic cylinder 2 (2) is fixed with a plurality of matching blocks (21). A protective shell (5) is fixed to the outer wall of the telescopic cylinder (1), and the top of the driving rod (41) is located inside the protective shell (5). At the same time, an elastic member is provided between the top of the driving rod (41) and the top of the inner wall of the protective shell (5); a stabilizing holding device (6) is provided on the top of the protective shell (5), and the stabilizing holding device (6) includes a rotating control plate (61), a push bar (62) and a mounting plate (63). The rotating control plate (61) passes through the top of the protective shell (5) and is rotatably connected to the top of the protective shell (5). One end of the push bar (62) is connected to one side of the top of the rotating control plate (61). The other end of the push bar (62) is fixed to the bottom of one end of the mounting plate (63), the other end of the mounting plate (63) is hingedly mounted on the bottom of the flange (3), and the mounting plate (63) is located at the bottom of a positioning hole of the flange (3), one side of the bottom end of the rotation control plate (61) is in contact with one side of the vertical plate (431), and the bottom of the vertical plate (431) is fixed to the top of the movable positioning block (43); the push bar (62) is arranged in an arc shape, and the center of the push bar (62) is located at the hinge of the mounting plate (63) and the flange (3), and the movable positioning block (43) is located between the two matching blocks (21).

2. A novel small double-flange expansion joint according to claim 1, characterized in that: The driving block (42) is arranged at an inclined chamfer between the side close to the telescopic cylinder (1) and the top, and a connecting spring is provided between the movable positioning block (43) and the telescopic cylinder (1).

3. A novel small double-flange expansion joint according to claim 1, characterized in that: The elastic member between the top of the driving rod (41) and the top of the inner wall of the protective shell (5) is an arc-shaped spring piece (412), and the arc-shaped spring piece (412) protrudes in the direction of the movable positioning block (43). The side of the bottom end of the rotation control plate (61) away from the vertical plate (431) is fixed to one end of the elastic connecting plate (611), and the other end of the elastic connecting plate (611) is fixed to the center of the protruding side of the arc-shaped spring piece (412).

4. A novel small double-flange expansion joint according to claim 1, characterized in that: An auxiliary stabilizing device (7) is provided inside the telescopic cylinder (1), and the auxiliary stabilizing device (7) includes a limiting rod (71) and a resistance-increasing arc piece (72). The limiting rod (71) movably passes through the bottom of the telescopic cylinder (2), and the bottom end of the limiting rod (71) is fixed to the bottom of the inner wall of the telescopic cylinder (1). Both ends of the resistance-increasing arc piece (72) are fixed on the limiting rod (71), and one resistance-increasing arc piece (72) is located between the two matching blocks (21).

5. A novel small double-flange expansion joint according to claim 4, characterized in that: The resistance-increasing arc-shaped piece (72) is made of elastic metal, and a liquid storage capsule (8) is provided between the inner concave side of the resistance-increasing arc-shaped piece (72) and the limiting rod (71). The liquid storage capsule (8) is made of elastic rubber, and the interior of the liquid storage capsule (8) is filled with non-Newtonian fluid.

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