Auxiliary plastic shaft backfilling fixing device

Abstract

The invention belongs to the technical field of inspection well chamber plastic shaft backfilling, and discloses an auxiliary plastic shaft backfilling fixing device which comprises a fixing cylinder, a handle is arranged at the top end of the fixing cylinder, supporting rods are symmetrically fixed to the inner side of the fixing cylinder, and the free end of each supporting rod is sleeved with an adjusting part. The adjusting part is fixedly connected with the supporting part, and the supporting part is in contact with the outer wall of the plastic shaft so as to fix and support the plastic shaft; the device has the beneficial effects that the supporting part makes contact with the outer wall of the plastic shaft, uneven extrusion to the shaft during backfilling is reduced, it is guaranteed that in the tamping process of the periphery of the shaft, the instantaneous lateral pressure borne by the shaft is reduced, the roundness and perpendicularity of the shaft during backfilling of the plastic shaft are guaranteed, the construction quality is guaranteed, and the construction efficiency is improved. And the later reworking maintenance phenomenon is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of plastic wellbore backfilling technology for inspection well chambers, and particularly relates to an auxiliary plastic wellbore backfilling fixing device. Background Technology

[0002] In current technology, after the manhole chamber is installed, the manhole casing is installed by connecting the casings. After installation, it is manually straightened and the manhole casing position is fixed using simple tools. Then, the manhole casing is backfilled symmetrically. After the backfilling around the manhole casing is completed, compaction is carried out manually using small tamping equipment to compact the casing around the casing. This operation has several problems. During manual backfilling, the symmetrical backfilling causes the plastic manhole to be subjected to axial pressure, resulting in true circular deformation of the manhole casing. At the same time, there are no effective measures to ensure the verticality of the manhole casing during backfilling. During the backfilling and compaction process, the instantaneous lateral pressure on the manhole casing is large, which can easily cause the manhole casing to tilt. This is because the rigidity of the plastic manhole casing is limited, and there are no effective measures to maintain verticality. During manual backfilling and compaction, uneven compression of the manhole casing is unavoidable, leading to deformation and tilting of the manhole casing. Summary of the Invention

[0003] The objective of this invention is to solve the problem that during the backfilling of plastic manholes in inspection chambers, there are no effective measures to ensure the verticality of the manholes, and the manholes are subjected to high instantaneous lateral pressure during the backfilling and compaction processes, which can easily cause the manholes to tilt.

[0004] To achieve the above objectives, the present invention provides an auxiliary plastic wellbore backfilling and fixing device.

[0005] The specific technical solution adopted in this invention is as follows: An auxiliary plastic well casing backfilling and fixing device includes a fixing cylinder with a handle at the top. Support rods are symmetrically fixed on the inner side of the fixing cylinder. Each support rod has an adjustment part sleeved on its free end. The adjustment part is fixedly connected to the support part. The support part contacts the outer wall of the plastic well casing to fix and support the plastic well casing.

[0006] Furthermore, the inner side of the fixed cylinder is symmetrically welded or riveted with support rods, and the end of the adjusting part near the axis of the fixed cylinder is welded or riveted together with the support part.

[0007] Furthermore, the support includes a crossbar, with support claws symmetrically fixed at both ends of the crossbar. The support claws and the crossbar form a U-shape or a V-shape, and the ends of the support claws contact the outer wall of the plastic well casing.

[0008] Furthermore, the support includes a crossbar, with support claws symmetrically fixed at both ends of the crossbar. The support claws and the crossbar form a U-shape or V-shape. A pair of fixing plates are symmetrically provided in the middle of the crossbar. The fixing plates are rotatably connected to support wheels via a rotating shaft. The ends of the support wheels and support claws contact the outer wall of the plastic well casing.

[0009] Furthermore, the support includes a crossbar, with a pair of fixing plates symmetrically fixed at both ends of the crossbar. The fixing plates are rotatably connected to support wheels via a pivot. The support wheels are in contact with the outer wall of the plastic well casing.

[0010] Furthermore, the adjusting part is a threaded sleeve with an inner hole, and the adjusting part is threadedly connected to the support rod; the end of the adjusting part near the axis of the fixed cylinder is welded or riveted to the support part through a connecting block, the end of the connecting block near the adjusting part is provided with a rotating hole, the side wall of the connecting block is provided with a threaded hole, and a set screw is threadedly connected in the threaded hole; the end of the adjusting part is provided with a rotating shaft, and the end of the rotating shaft is provided with a groove; the rotating shaft is inserted into the rotating hole, and after the set screw is screwed into the threaded hole, it cooperates with the groove to limit the rotating shaft in the rotating hole.

[0011] Furthermore, the support rod is slidably connected to the adjustment part via a smooth rod. The adjustment part is a tubular sleeve that can slide freely on the outer cylindrical surface of the smooth rod. The side wall of the adjustment part is provided with a locking mounting groove, and a fixed platform is fixed in the locking mounting groove. The fixed platform is provided with a fixed through hole, and a rotating shaft is rotatably mounted in the fixed through hole. An eccentric wheel is fixed on the rotating shaft near the fixed platform, and a handle is fixed on the rotating shaft away from the fixed platform. The distance from the distal end of the eccentric wheel to the axis of the rotating shaft is greater than the distance from the smooth rod to the axis of the rotating shaft.

[0012] Furthermore, the fixed cylinder includes an outer sleeve, and a first inner sleeve and a second inner sleeve are inserted into the inner wall of the outer sleeve. The first inner sleeve and the second inner sleeve have the same shape and slide within the outer sleeve. Support rods are symmetrically welded or riveted to the inner walls of the first inner sleeve and the second inner sleeve. An adjustment part is sleeved on the free end of each support rod. The end of the adjustment part near the axis of the fixed cylinder is welded or riveted to the support part. The support part is in contact with the outer wall of the plastic well cylinder.

[0013] The positive effects of this invention are: by having the support part contact the outer wall of the plastic well cylinder, uneven compression of the well cylinder during backfilling is reduced, ensuring that the instantaneous lateral pressure on the well cylinder is reduced during the compaction process around the well cylinder, ensuring the roundness and verticality of the well cylinder during backfilling, ensuring construction quality, reducing rework and maintenance in the later stage, and improving work efficiency. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of an auxiliary plastic wellbore backfilling and fixing device according to the present invention; Figure 2 yes Figure 1The figure shown is a front view of an auxiliary plastic wellbore backfilling and fixing device of the present invention; Figure 3 yes Figure 2 The figure shows a cross-sectional view along line AA of an auxiliary plastic well casing backfilling and fixing device of the present invention. Figure 4 yes Figure 1 The figure shown is a three-dimensional structural schematic diagram of a second embodiment of an auxiliary plastic wellbore backfilling and fixing device of the present invention; Figure 5 yes Figure 2 The image shown is a cross-sectional view along line AA in a second embodiment of the auxiliary plastic wellbore backfilling and fixing device of the present invention. Figure 6 yes Figure 1 The diagram shown is a three-dimensional structural schematic of the first embodiment of the support part in an auxiliary plastic wellbore backfilling and fixing device of the present invention. Figure 7 yes Figure 1 The diagram shows a three-dimensional structural schematic of a second embodiment of the support portion in an auxiliary plastic wellbore backfilling and fixing device of the present invention. Figure 8 yes Figure 1 The figure shown is a three-dimensional structural schematic diagram of the support part in a third embodiment of an auxiliary plastic wellbore backfilling and fixing device of the present invention. Figure 9 yes Figure 1 The diagram shown is a schematic diagram of the first embodiment of the adjusting part in an auxiliary plastic wellbore backfilling and fixing device of the present invention. Figure 10 yes Figure 1 The diagram shows a second embodiment of the adjusting part in an auxiliary plastic wellbore backfilling and fixing device of the present invention. Figure 11 yes Figure 10 Enlarged view of point E in the middle.

[0015] Explanation of reference numerals in the attached drawings: 1—Handle, 2—Fixed cylinder, 201—First inner sleeve, 202—Second inner sleeve, 203—Outer sleeve, 204—First limiting boss, 205—Second limiting boss, 206—Lower notch, 207—Lower flange, 208—Upper flange, 209—Upper notch, 210—Wire rope, 3—Adjusting part, 301—Bottom adjusting part, 302—Set screw, 303—Groove, 304—Connecting block, 305—Rotating hole, 306—Rotating shaft, 307—Handle, 308—Eccentric wheel, 309—Rotating shaft, 310—Fixed platform. 311—Locking mounting groove, 4—Support rod, 401—Bottom support rod, 402—Smooth rod, 403—Rubber layer, 404—Shear thickening fluid layer, 5—Support part, 501—Bottom support part, 502—Crossbar, 503—Support claw, 504—Fixing plate, 505—Support wheel. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0019] like Figure 1 The diagram shown is a structural diagram of an auxiliary plastic well casing backfilling and fixing device provided in an embodiment of the present invention. It includes a fixing cylinder, a handle at the top of the fixing cylinder, and support rods symmetrically fixed on the inner side of the fixing cylinder. Each support rod has an adjustment part sleeved on its free end. The adjustment part is fixedly connected to the support part, and the support part contacts the outer wall of the plastic well casing to fix and support the plastic well casing.

[0020] In this embodiment of the invention, by having the support part contact the outer wall of the plastic well cylinder, the uneven compression of the well cylinder during backfilling is reduced, ensuring that the instantaneous lateral pressure on the well cylinder is reduced during the compaction process around the well cylinder, thus ensuring the roundness and verticality of the well cylinder during backfilling, guaranteeing construction quality, reducing rework and maintenance in the later stages, and improving work efficiency.

[0021] Example 1: In one example of the present invention, such as Figures 1 to 3 As shown, an auxiliary plastic well casing backfilling and fixing device includes a fixing cylinder 2, which is a tubular structure made of carbon steel. A handle 1 is provided at the top of the fixing cylinder for lifting or placing the fixing cylinder into the backfilled foundation pit. Support rods 4 are symmetrically welded or riveted to the inner side of the fixing cylinder 2; each support rod 4 has an adjusting part 3 fitted onto its free end. The adjusting part 3 is a threaded sleeve with an inner hole, and is threadedly connected to the support rod 4. One end of the adjusting part 3 near the axis of the fixing cylinder 2 is welded or riveted to a support part 5, which contacts the outer wall of the plastic well casing to fix and support it.

[0022] Preferred, such as Figure 6 As shown, the support part 5 includes a crossbar 502, and support claws 503 are symmetrically fixed at both ends of the crossbar 502. The support claws 503 and the crossbar 502 form a U-shape or V-shape. The ends of the support claws 503 contact the outer wall of the plastic well cylinder to fix and support the plastic well cylinder.

[0023] Preferred, such as Figure 7 As shown, the support part 5 includes a crossbar 502, with support claws 503 symmetrically fixed at both ends of the crossbar 502. The support claws 503 and the crossbar 502 form a U-shape or V-shape. A pair of fixing plates 504 are symmetrically provided in the middle of the crossbar. The fixing plates 504 are rotatably connected to support wheels 505 through a rotating shaft. The ends of the support wheels 505 and the support claws 503 contact the outer wall of the plastic well cylinder to fix and support the plastic well cylinder. When the support part 5 moves on the outer cylindrical surface of the plastic well cylinder, the support wheels 505 can drive the support part 5 to move in a rolling manner, ensuring smoother movement.

[0024] Preferred, such as Figure 8 As shown, the support part 5 includes a crossbar 502, and a pair of fixing plates 504 are symmetrically fixed at both ends of the crossbar 502. The fixing plates 504 are rotatably connected to the support wheels 505 through a rotating shaft. The support wheels 505 contact the outer wall of the plastic well cylinder to fix and support the plastic well cylinder. When the support part 5 moves on the outer cylindrical surface of the plastic well cylinder, the support wheels 505 can drive the support part 5 to move in a rolling manner, ensuring smoother movement.

[0025] Preferred, such as Figure 9As shown, the adjusting part 3 is a threaded sleeve with an inner hole, and the adjusting part 3 is threadedly connected to the support rod 4. One end of the adjusting part 3 near the axis of the fixed cylinder 2 is welded or riveted to the support part 5 via a connecting block 304. The connecting block 304 near the adjusting part 3 has a rotating hole 305, and its side wall has a threaded hole with a set screw 302 threadedly connected inside. The end of the adjusting part 3 has a rotating shaft 306, and the end of the rotating shaft 306 has a groove 303. The rotating shaft 306 is inserted into the rotating hole 305. After the set screw 302 is screwed into the threaded hole, it cooperates with the groove 303 to limit the rotating shaft 306. Inside the rotating hole 305; with this structure, the support part 5 can rotate around the axis of the adjusting part 3. When the adjusting part 3 is connected to the support rod 4 to adjust the position of the support part 5 from the fixed cylinder 2, there will be a situation where the support part 5 contacts the fixed cylinder and the end face of the support part 5 is not perpendicular to the axis of the fixed cylinder. That is, the support part 5 and the outer cylindrical surface of the fixed cylinder are not aligned, which causes the problem of unstable support. By rotating the support part 5 around the axis of the adjusting part 3, the posture of the adjusting part 3 relative to the fixed cylinder 2 can be changed by rotating the adjusting part 3, so as to achieve stable support of the fixed cylinder 2 by the support part.

[0026] Preferred, such as Figure 10 and Figure 11As shown, the support rod 4 is slidably connected to the adjusting part 3 via the smooth rod 402. The adjusting part 3 is a tubular sleeve that can slide freely on the outer cylindrical surface of the smooth rod 402. The side wall of the adjusting part 3 is provided with a locking mounting groove 311. A fixing platform 310 is fixed in the locking mounting groove 311. The fixing platform 310 is provided with a fixing through hole. A rotating shaft 309 is rotatably mounted in the fixing through hole. An eccentric wheel 308 is fixed on the rotating shaft 309 near the fixing platform 310. A handle 307 is fixed on the rotating shaft 309 away from the fixing platform 310. The distance from the distal end of the eccentric wheel 308 to the axis of the rotating shaft 309 is greater than... The distance from the optical rod 402 to the axis of the rotating shaft 309; the rotating handle 307 can drive the eccentric wheel 308 to rotate through the rotating shaft 309. When the distal end of the eccentric wheel 308 rotates to the optical rod 402, the fixing between the adjusting part 3 and the optical rod 402 is achieved by the clamping force. Conversely, when the distal end of the eccentric wheel 308 moves away from the optical rod 402, the fixing between the adjusting part 3 and the optical rod 402 is released by releasing the clamping force. With this design, the adjusting part 3 can move quickly on the surface of the optical shaft 402. The quick movement is relative to the structure of the threaded connection between the adjusting part 3 and the support rod 4. Furthermore, the surface of the optical axis 402 is coated from the inside out with a rubber layer 403 and a shear thickening fluid layer 404. When the handle 307 is turned, the eccentric wheel 308 can be rotated via the shaft 309. When the distal end of the eccentric wheel 308 is rotated to the optical rod 402, the shear thickening fluid layer 404 hardens under pressure when the distal end of the eccentric wheel 308 presses against the surface of the optical rod. At the same time, since the rubber layer 403 is provided between the shear thickening fluid layer 404 and the optical rod 402, the hardened shear thickening fluid layer 404... Under the pressure of the distal end of the eccentric wheel 308, the hardened shear thickening fluid layer 404 bends towards the rubber layer, forming a temporary recess that matches the distal end of the eccentric wheel 308. At the same time, the two sides of the recess are also hardened shear thickening fluid layers 404, which can prevent the sliding between the adjusting part 3 and the smooth rod 402. The thicker the shear thickening fluid layer 404, the better the effect of preventing the sliding between the adjusting part 3 and the smooth rod 402.

[0027] Shear-thickening fluid (STF) is a special type of non-Newtonian fluid whose viscosity increases significantly with the increase of shear rate or external force, exhibiting the characteristic of "becoming stronger when subjected to strong forces". This smart material hardens rapidly when subjected to impact and returns to a liquid state after the external force disappears, thus having important applications in fields such as protection, shock absorption, and robotics.

[0028] Example 2: Based on Embodiment 1 of the present invention, the fixing cylinder 2 includes an outer sleeve 203. A first inner sleeve 201 and a second inner sleeve 202 are inserted into the inner wall of the outer sleeve 203. The first inner sleeve 201 and the second inner sleeve 202 have the same shape and slide within the outer sleeve 203. Support rods 4 are symmetrically welded or riveted to the inner walls of both the first inner sleeve 201 and the second inner sleeve 202. The support rods 4 are screws. An adjusting part 3 is fitted onto the free end of each support rod 4. One end of the adjusting part 3 near the axis of the fixing cylinder 2 is welded or riveted to a support part 5. The support part 5 contacts the outer wall of the plastic well cylinder to fix and support the plastic well cylinder. Specifically, the second inner sleeve 202... Support rods 4 are symmetrically welded or riveted to the inner wall of the plastic well casing. Each support rod 4 has an adjustment part 3 sleeved on its free end. The end of the adjustment part 3 near the axis of the fixed cylinder 2 is welded or riveted to the support part 5. The support part 5 is in contact with the outer wall of the plastic well casing. Bottom support rods 401 are symmetrically welded or riveted to the inner wall of the first inner sleeve 201. Each bottom support rod 401 has a bottom adjustment part 301 sleeved on its free end. The end of the bottom adjustment part 301 near the axis of the fixed cylinder 2 is welded or riveted to the bottom support part 501. The bottom support part 501 is in contact with the outer wall of the plastic well casing.

[0029] Preferably, the top end of the outer sleeve 203 is provided with a first limiting protrusion 204, and the bottom end of the outer sleeve 203 is provided with a second limiting protrusion 205. The first limiting protrusion 204 and the second limiting protrusion 205 are used to restrict the first inner sleeve 201 and the second inner sleeve 202 from sliding out of the outer sleeve 203.

[0030] Preferably, steel wire ropes 210 are symmetrically fixed at the top of the first inner sleeve 201. When the height of the backfill material reaches the bottom of the bottom support rod 401, the first inner sleeve is pulled upward by the steel wire ropes 210, ensuring that the plastic well cylinder is always supported during the backfilling process. This ensures the roundness and verticality of the well cylinder during backfilling, guarantees the construction quality, reduces rework and maintenance in the later stage, and improves work efficiency.

[0031] Preferably, the second inner sleeve 202 is provided with a wire rope through hole, through which the wire rope 210 passes. When the first inner sleeve 201 and the second inner sleeve 202 come into contact, the first inner sleeve 201 and the second inner sleeve 202 move upward by pulling the wire rope.

[0032] Preferably, the wall of the first inner sleeve 201 is alternately provided with an upper flange 208 and an upper notch 209, and the wall of the second inner sleeve 202 is alternately provided with a lower flange 207 and a lower notch 206. The lower flange 207 and the upper notch 209 are shaped to match, and the lower notch 206 and the upper flange 208 are shaped to match. Through the cooperation of the lower flange 207 and the upper notch 209, and the cooperation of the lower notch 206 and the upper flange 208, when the first inner sleeve 201 and the second inner sleeve 202 are in contact, the gap between the bottom support rod 401 and the support rod 4 can be reduced. This ensures that the plastic well casing is always supported during the backfilling process, ensuring the roundness and verticality of the well casing during backfilling, guaranteeing construction quality, reducing rework and maintenance in the later stages, and improving work efficiency.

[0033] The foregoing has broadly outlined some aspects and features of the various embodiments and should be interpreted as merely illustrative of potential applications. Other beneficial results can be obtained by applying the disclosed information in different ways or by combining aspects of the disclosed embodiments. Further aspects and a more complete understanding can be obtained based on the detailed description of exemplary embodiments with reference to the accompanying drawings, within the scope defined by the claims.

[0034] The above embodiments provide a detailed description of the present invention. Of course, the above description is not intended to limit the present invention, nor is the present invention limited to the examples described above. Any changes, modifications, additions, reductions, or substitutions made by those skilled in the art within the scope of the present invention are also within the protection scope of the present invention.

Claims

1. An auxiliary plastic wellbore backfilling and fixing device, characterized in that, The backfill fixing device includes a fixing cylinder with a handle at the top. Support rods are symmetrically fixed on the inner side of the fixing cylinder. Each support rod has an adjustment part sleeved on its free end. The adjustment part is fixedly connected to the support part. The support part contacts the outer wall of the plastic well cylinder to fix and support the plastic well cylinder.

2. The auxiliary plastic wellbore backfilling and fixing device according to claim 1, characterized in that, The inner side of the fixed cylinder is symmetrically welded or riveted with support rods, and the end of the adjusting part near the axis of the fixed cylinder is welded or riveted together with the support part.

3. The auxiliary plastic wellbore backfilling and fixing device according to claim 2, characterized in that, The support includes a crossbar, with support claws fixed symmetrically at both ends of the crossbar. The support claws and the crossbar form a U-shape or a V-shape, and the ends of the support claws contact the outer wall of the plastic well casing.

4. The auxiliary plastic wellbore backfilling and fixing device according to claim 2, characterized in that, The support includes a crossbar with symmetrically fixed support claws at both ends. The support claws and the crossbar form a U-shape or V-shape. A pair of fixing plates are symmetrically provided in the middle of the crossbar. The fixing plates are rotatably connected to support wheels via a rotating shaft. The ends of the support wheels and support claws are in contact with the outer wall of the plastic well casing.

5. The auxiliary plastic wellbore backfilling and fixing device according to claim 2, characterized in that, The support includes a crossbar, with a pair of fixing plates symmetrically fixed at both ends of the crossbar. The fixing plates are rotatably connected to support wheels via a pivot. The support wheels are in contact with the outer wall of the plastic well casing.

6. The auxiliary plastic wellbore backfilling and fixing device according to any one of claims 1 to 5, characterized in that, The adjusting part is a threaded sleeve with an inner hole, and the adjusting part is threadedly connected to the support rod. The end of the adjusting part near the axis of the fixed cylinder is welded or riveted to the support part through a connecting block. The end of the connecting block near the adjusting part is provided with a rotating hole, and the side wall of the connecting block is provided with a threaded hole. A set screw is threadedly connected in the threaded hole. The end of the adjusting part is provided with a rotating shaft, and the end of the rotating shaft is provided with a groove. The rotating shaft is inserted into the rotating hole. After the set screw is screwed into the threaded hole, it cooperates with the groove to limit the rotating shaft in the rotating hole.

7. The auxiliary plastic wellbore backfilling and fixing device according to any one of claims 1 to 5, characterized in that, The support rod is slidably connected to the adjustment part via a smooth rod. The adjustment part is a tubular sleeve that can slide freely on the outer cylindrical surface of the smooth rod. The side wall of the adjustment part is provided with a locking mounting groove, and a fixed platform is fixed in the locking mounting groove. The fixed platform is provided with a fixed through hole, and a rotating shaft is rotatably mounted in the fixed through hole. An eccentric wheel is fixed on the rotating shaft near the fixed platform, and a handle is fixed on the rotating shaft away from the fixed platform. The distance from the distal end of the eccentric wheel to the axis of the rotating shaft is greater than the distance from the smooth rod to the axis of the rotating shaft.

8. The auxiliary plastic wellbore backfilling and fixing device according to claim 6, characterized in that, The fixed cylinder includes an outer sleeve, and a first inner sleeve and a second inner sleeve are inserted into the inner wall of the outer sleeve. The first inner sleeve and the second inner sleeve have the same shape and slide inside the outer sleeve. Support rods are symmetrically welded or riveted to the inner walls of the first inner sleeve and the second inner sleeve. An adjustment part is sleeved on the free end of each support rod. The end of the adjustment part near the axis of the fixed cylinder is welded or riveted to the support part. The support part is in contact with the outer wall of the plastic well cylinder.

9. The auxiliary plastic wellbore backfilling and fixing device according to claim 7, characterized in that, The fixed cylinder includes an outer sleeve, and a first inner sleeve and a second inner sleeve are inserted into the inner wall of the outer sleeve. The first inner sleeve and the second inner sleeve have the same shape and slide inside the outer sleeve. Support rods are symmetrically welded or riveted to the inner walls of the first inner sleeve and the second inner sleeve. An adjustment part is sleeved on the free end of each support rod. The end of the adjustment part near the axis of the fixed cylinder is welded or riveted to the support part. The support part is in contact with the outer wall of the plastic well cylinder.

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