Movable assistor for peritoneal dialysis

Abstract

The invention discloses a movable assistor for peritoneal dialysis, and relates to the technical field of peritoneal dialysis. The movable assistor for peritoneal dialysis comprises a bottom plate, a fixing rod is fixedly arranged on the top face of the bottom plate, the outer wall of the fixing rod is slidably sleeved with a lifting sleeve, a plurality of self-locking wheels are fixedly arranged on the bottom face of the bottom plate, and a lifting mechanism, a dialysis mechanism, a placing mechanism and a fixing mechanism are arranged above the bottom plate. The dialysis mechanism has the technical effects that the dialysis mechanism is composed of the monitoring part and the control part, an automatic monitoring and intelligent control system for the dialysis process is formed, two tray scales of the monitoring part can monitor the weight change of a dialysate container in real time, and the weight information is transmitted to the control calculator through a second data line; the two intelligent flow monitoring valves are installed at the bottom of the connecting pipe and can monitor the flow of dialysate in real time and transmit data through the first data line, and the calculator is controlled to analyze and process the received weight and flow information.

Description

Technical Field

[0001] The present invention relates to the technical field of peritoneal dialysis, in particular to a movable peritoneal dialysis auxiliary device. Background Art

[0002] Peritoneal dialysis is a renal replacement therapy that uses the body's own peritoneum as a semipermeable membrane. By perfusing dialysate into the peritoneal cavity, solute and water exchange is achieved between the blood and the dialysate, thereby removing metabolic waste from the body and correcting water, electrolyte, and acid-base imbalances. During peritoneal dialysis treatment, stents are needed to assist with the procedure; Existing dialysis stents cannot achieve scientific calculation of peritoneal dialysis fluid input and output. Physicians need to manually calculate and inform nurses to perform corresponding operations, which increases the workload of medical staff. In addition, due to manual peritoneal dialysis, calculation and control are complicated for elderly peritoneal dialysis patients when patients operate at home, which increases the difficulty of patient operation. Therefore, a mobile peritoneal dialysis assist device is proposed. Summary of the Invention

[0003] (1) Technical problems solved In response to the shortcomings of the existing technology, the present invention provides a movable peritoneal dialysis assisting device, which solves the problem that the dialysis stent cannot realize the scientific calculation of the input and output of peritoneal dialysis fluid, requiring doctors to manually calculate and inform nurses to perform corresponding operations, increasing the workload of medical staff. In addition, due to manual peritoneal dialysis, when patients operate at home, the calculation and control are complicated for elderly peritoneal dialysis patients, which increases the difficulty of patient operation.

[0004] (2) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: comprising a base plate, a fixing rod fixedly provided on the top surface of the base plate, a lifting sleeve provided on the sliding sleeve of the outer wall of the fixing rod, a plurality of self-locking wheels fixedly provided on the bottom surface of the base plate, and a lifting mechanism, a dialysis mechanism, a placement mechanism and a fixing mechanism provided above the base plate; The dialysis mechanism includes a monitoring unit and a control unit; The monitoring unit includes two intelligent flow monitoring valves and two pallet scales, and the control unit includes a control computer; Two mounting plates are fixedly provided on the top surface and outer wall of the lifting sleeve respectively. The top surfaces of the two mounting plates are bolted to the outer walls of the two pallet scales respectively. A drawer box is fixedly provided on the outer wall of the lifting sleeve. The top surface of the drawer box is fixedly connected to the bottom surface of the control calculator. Two connecting pipes are fixedly provided on the inner side surfaces of the two mounting plates respectively. The bottom surfaces of the two connecting pipes are bolted to the outer walls of the two intelligent flow monitoring valves respectively. The model of the intelligent flow monitoring valve is StaigerVA304-913 series, and the model of the pallet scale is MSKCRC03 electronic desktop scale.

[0005] Preferably, the lifting mechanism includes a threaded rod, the bottom surface of the threaded rod is rotatably connected to the top surface of the base plate through a first bearing seat, a control block is provided on the threaded sleeve on the outer wall of the threaded rod, the outer wall of the control block is fixedly connected to the outer wall of the lifting sleeve, a rotating rod is rotatably provided on the top surface of the base plate through a second bearing seat, a driving gear is provided on the fixed sleeve on the outer wall of the rotating rod, and a driven gear is provided on the fixed sleeve on the outer wall of the threaded rod, and the tooth surface of the driving gear is meshed with the tooth surface of the driven gear.

[0006] Preferably, the placement mechanism includes two placement racks, the bottom surfaces of the two placement racks are fixedly connected to the inner sides of the two pallet scale trays, the outer walls of the two placement racks are fixed with two hooks, and the inner sides of the two hooks are slid through and have two pressure rings extending to the outside of the two hooks.

[0007] Preferably, the fixing mechanism includes two groups of clamping blocks, two fixing rings are fixedly sleeved on the outer walls of the two connecting tubes, the top surfaces of the two fixing rings are slidingly connected to the bottom surfaces of the two groups of clamping blocks, and two groups of control plates are slidingly provided on the inner sides of the two fixing rings, and the top surfaces of the two groups of control plates are fixedly connected to the bottom surfaces of the two groups of clamping blocks.

[0008] Preferably, the two intelligent flow monitoring valves and the control calculator are respectively connected to two first data lines, and the two first data lines are used for information transmission between the two intelligent flow monitoring valves and the control calculator. The two pallet scales and the control calculator are respectively connected to two second data lines, and the two second data lines are used for information transmission between the two pallet scales and the control calculator.

[0009] Preferably, a drawer is slidably provided on the inner side of the drawer box.

[0010] Preferably, two extrusion plates are slidably provided on the inner sides of the two placement racks, the outer walls of the two extrusion plates are fixedly connected to the outer walls of the two pressure rings, and two dampers and two springs are fixedly provided on the inner sides of the two placement racks, the bottom surfaces of the two dampers and the two springs are fixedly connected to the outer walls of the two extrusion plates, and the initial states of the two springs are respectively extended.

[0011] Preferably, the outer walls of the two connecting pipes are respectively slidably sleeved with two lifting rings, the outer walls of the two lifting rings are respectively hingedly provided with two groups of connecting plates, and the side surfaces of the two groups of connecting plates close to the two groups of control panels are respectively hinged to the outer walls of the two groups of control panels.

[0012] Preferably, two extrusion grooves are respectively provided on the outer walls of the two connecting tubes, two extrusion screws are respectively threaded through the outer walls of the two lifting rings and extend to the inner walls of the two extrusion grooves, two groups of limit rods are respectively fixed on the inner sides of the two fixed rings, and the outer walls of the two groups of limit rods are respectively slidably connected to the inner sides of the two groups of control panels.

[0013] (3) Beneficial effects The present invention provides a movable peritoneal dialysis assist device, which has the following beneficial effects: (1) This is a mobile peritoneal dialysis auxiliary device. The dialysis mechanism consists of a monitoring unit and a control unit, forming an automated monitoring and intelligent control system for the dialysis process. The two pallet scales of the monitoring unit can monitor the weight changes of the dialysate container in real time and transmit the weight information to the control computer through the second data line; two intelligent flow monitoring valves are installed at the bottom of the connecting pipe, which can monitor the dialysate flow in real time and transmit data through the first data line. The control computer analyzes and processes the received weight and flow information, allowing medical staff or patients to grasp the dialysis progress in real time and promptly discover problems such as abnormal flow and insufficient remainder, thereby reducing the risk of excessive or insufficient dialysis and greatly improving the safety of peritoneal dialysis. In addition, the drawer box on the outer wall of the lifting sleeve and the drawer with sliding arrangement inside provide convenient storage space for related items required for dialysis, enhancing the practicality of the equipment. (2) This is a movable peritoneal dialysis assist device. The lifting mechanism realizes the adjustment of the height of related components through the coordinated action of structures such as threaded rods, control blocks, and gear transmission. It can flexibly adapt to the use needs of patients of different heights, and at the same time meet the dialysis scenarios of patients in different postures such as sitting and lying, ensuring that the dialysate delivery height is within a reasonable range, which not only improves the patient's comfort during the dialysis process, but also ensures the stability of the dialysate flow rate, effectively avoiding the problem of poor dialysis effect caused by height discomfort.

[0014] (3) This is a movable peritoneal dialysis assist device. The placement mechanism is specially designed for the stable placement of dialysate bags. The two placement racks provide a placement platform for the dialysate bags. The hooks on the outer walls can realize the suspension function of the dialysate bags. The dampers and springs on the inner side of the placement racks apply continuous force to the squeezing plate, so that the squeezing plate tightly presses the dialysate bag placed in the rack, which can effectively prevent the dialysate bag from shaking or falling during the movement or use of the assist device, ensure the stability of the placement of the dialysate bag, and provide reliable protection for the smooth progress of the peritoneal dialysis process.

[0015] (4) This is a movable peritoneal dialysis auxiliary device, the fixing mechanism realizes the fixation of the dialysate pipeline, the lifting ring on the outer wall of the connecting tube can slide up and down, and the connecting plate hinged on the outer wall is connected to the control plate. When the lifting ring slides, it can drive the control plate and the clamping block on the top to move closer to or away from the connecting tube through the connecting plate, thereby achieving the clamping and fixation of the dialysate pipeline. The extrusion screw on the outer wall of the lifting ring extends into the extrusion groove of the connecting tube. After tightening, the lifting ring can be fixed in the required position to ensure stable clamping force. The limit rod on the inner side of the fixing ring limits the sliding of the control plate, ensuring its sliding stability. This structure can not only effectively prevent the pipeline from shifting and falling off during dialysis, reducing the risk of infection, but also facilitate the installation and disassembly of the pipeline, and improve the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 It is a structural schematic diagram of the lifting mechanism of the present invention; Figure 3 Schematic diagram of the structure of the dialysis mechanism of the present invention; Figure 4 It is a structural schematic diagram of the placement mechanism of the present invention; Figure 5 It is a structural schematic diagram of the fixing mechanism of the present invention; Figure 6 For the present invention Figure 4 Schematic diagram of the structure of the enlarged area A in the middle; Figure 7 For the present invention Figure 5 Schematic diagram of the structure placed in area B.

[0017] In the figure: 1. Base plate; 2. Fixed rod; 3. Lifting sleeve; 4. Lifting mechanism; 41. Threaded rod; 42. Control block; 43. Driven gear; 44. Driving gear; 45. Rotating rod; 5. Dialysis mechanism; 51. Drawer; 52. Drawer box; 53. Control calculator; 54. First data line; 55. Intelligent flow monitoring valve; 56. Connecting pipe; 57. Pallet scale; 58. Mounting plate; 59. Second data line; 6. Placing mechanism; 61. Placing rack; 62. Hook; 63. Damper; 64. Spring; 65. Pressure ring; 66. Extrusion plate; 7. Fixing mechanism; 71. Fixed ring; 72. Clamping block; 73. Extrusion screw; 74. Lifting ring; 75. Extrusion groove; 76. Control board; 77. Limiting rod; 78. Connecting plate; 8. Self-locking wheel. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-7 The present invention provides a technical solution: comprising a base plate 1, a fixing rod 2 is fixedly provided on the top surface of the base plate 1, a lifting sleeve 3 is provided on the sliding sleeve of the outer wall of the fixing rod 2, a plurality of self-locking wheels 8 are fixedly provided on the bottom surface of the base plate 1, and a lifting mechanism 4, a dialysis mechanism 5, a placement mechanism 6 and a fixing mechanism 7 are provided above the base plate 1; The dialysis mechanism 5 includes a monitoring unit and a control unit; The monitoring unit includes two intelligent flow monitoring valves 55 and two pallet scales 57, and the control unit includes a control calculator 53; Two mounting plates 58 are fixedly provided on the top surface and outer wall of the lifting sleeve 3, and the top surfaces of the two mounting plates 58 are bolted to the outer walls of the two pallet scales 57 respectively. A drawer box 52 is fixedly provided on the outer wall of the lifting sleeve 3, and the top surface of the drawer box 52 is fixedly connected to the bottom surface of the control calculator 53. Two connecting pipes 56 are fixedly provided on the inner sides of the two mounting plates 58, and the bottom surfaces of the two connecting pipes 56 are bolted to the outer walls of the two intelligent flow monitoring valves 55 respectively. The two intelligent flow monitoring valves 55 and the control calculator 53 are connected with two first data lines 54 respectively, and the two first data lines 54 are used for information transmission between the two intelligent flow monitoring valves 55 and the control calculator 53. The two pallet scales 57 and the control calculator 53 are connected with two second data lines 59 respectively, and the two second data lines 59 are used for information transmission between the two pallet scales 57 and the control calculator 53. A drawer 51 is slidably provided on the inner side of the drawer box 52; The lifting mechanism 4 includes a threaded rod 41, the bottom surface of the threaded rod 41 is rotatably connected to the top surface of the base plate 1 through a first bearing seat, a control block 42 is provided on the outer wall of the threaded rod 41 through a threaded sleeve, and the outer wall of the control block 42 is fixedly connected to the outer wall of the lifting sleeve 3, and a rotating rod 45 is rotatably provided on the top surface of the base plate 1 through a second bearing seat, and a driving gear 44 is provided on the outer wall of the rotating rod 45. A driven gear 43 is provided on the outer wall of the threaded rod 41. The tooth surface of the driving gear 44 meshes with the tooth surface of the driven gear 43; The placing mechanism 6 includes two placing racks 61, the bottom surfaces of the two placing racks 61 are respectively fixedly connected to the inner sides of the two pallet scales 57 pallets, the outer walls of the two placing racks 61 are respectively fixedly provided with two hooks 62, the inner sides of the two hooks 62 are respectively slidably penetrated by two pressure rings 65 extending to the outsides of the two hooks 62, the inner sides of the two placing racks 61 are respectively slidably provided with two extrusion plates 66, the outer walls of the two extrusion plates 66 are respectively fixedly connected to the outer walls of the two pressure rings 65, the inner sides of the two placing racks 61 are respectively fixedly provided with two dampers 63 and two springs 64, the bottom surfaces of the two dampers 63 and the two springs 64 are respectively fixedly connected to the outer walls of the two extrusion plates 66, and the initial states of the two springs 64 are respectively extended; The fixing mechanism 7 includes two groups of clamping blocks 72, and the outer walls of the two connecting tubes 56 are respectively fixedly sleeved with two fixing rings 71, and the top surfaces of the two fixing rings 71 are slidably connected to the bottom surfaces of the two groups of clamping blocks 72, and the inner sides of the two fixing rings 71 are respectively slidably provided with two groups of control plates 76, and the top surfaces of the two groups of control plates 76 are respectively fixedly connected to the bottom surfaces of the two groups of clamping blocks 72. The outer walls of the two connecting tubes 56 are respectively slidably sleeved with two lifting rings 74, and the outer walls of the two lifting rings 74 are respectively hinged with two groups of connecting plates 78, and the side surfaces of the two groups of connecting plates 78 close to the two groups of control plates 76 are respectively hinged to the outer walls of the two groups of control plates 76. The outer walls of the two connecting tubes 56 are respectively provided with two extrusion grooves 75, and the outer walls of the two lifting rings 74 are respectively threaded with two extrusion screws 73 extending to the inner walls of the two extrusion grooves 75. The inner sides of the two fixing rings 71 are respectively fixed with two groups of limit rods 77, and the outer walls of the two groups of limit rods 77 are respectively slidably connected to the inner sides of the two groups of control plates 76.

[0020] When in use, the lifting mechanism 4, the dialysis mechanism 5, the placement mechanism 6 and the fixing mechanism 7 work in coordination to achieve the functions of movement, height adjustment, dialysate monitoring and control, dialysate storage bag placement and pipeline fixation during peritoneal dialysis; In terms of movement, a plurality of self-locking wheels 8 fixedly arranged on the bottom surface of the base plate 1 provide the assisting device with mobility. The user can push the assisting device to the desired position and then lock the self-locking wheels 8 to place the assisting device stably. The lifting mechanism 4 is used to adjust the height of related components to adapt to different usage requirements. When it is working, the rotating rod 45 is rotated to drive the driving gear 44 fixedly sleeved on its outer wall to rotate. Since the tooth surface of the driving gear 44 meshes with the tooth surface of the driven gear 43, the driven gear 43 rotates with the driving gear 44, thereby causing the threaded rod 41 fixedly connected to the driven gear 43 to rotate. When the threaded rod 41 rotates, the control block 42 threadedly sleeved on the outer wall will move up and down due to the rotation of the threaded rod 41. When the control block 42 moves, the lifting sleeve 3 will slide up and down along the outer wall of the fixed rod 2, thereby achieving height adjustment of the lifting sleeve 3 and the connected components thereon; The dialysis mechanism 5 is responsible for monitoring and controlling the dialysis process. The two tray scales 57 of the monitoring unit can monitor the weight of the dialysate container placed thereon in real time, and transmit the weight information to the control calculator 53 through the second data line 59. Two intelligent flow monitoring valves 55 are installed at the bottom of the connecting pipe 56, which can monitor the flow of the dialysate in the connecting pipe 56 and transmit the flow information to the control calculator 53 through the first data line 54. The control calculator 53 receives information from the tray scale 57 and the intelligent flow monitoring valves 55, analyzes and controls the dialysis process, and ensures the normal progress of the dialysis process. In addition, a drawer 51 is slidingly provided in the drawer box 52 fixed on the outer wall of the lifting sleeve 3, which can be used to store related items required for dialysis. Two sets of dialysis mechanisms 5 are provided to monitor the inflow and outflow of liquid during dialysis. The placement mechanism 6 is used to place the dialysate bag. The dialysate bag can be placed in the placement rack 61. The hook 62 on the outer wall of the placement rack 61 can suspend the dialysate bag above it. The damper 63 and spring 64 on the inner side of the placement rack 61 exert force on the squeezing plate 66, so that the squeezing plate 66 tightly presses the dialysate bag placed in the placement rack 61 to prevent it from shaking or falling. The fixing mechanism 7 is used to fix the dialysate tube sleeved on the outer wall of the connecting tube 56 to prevent the tube from shifting during the dialysis process. A control plate 76 is slidably provided on the fixing ring 71 on the outer wall of the connecting tube 56. The top surface of the control plate 76 is fixedly connected to the clamping block 72. The lifting ring 74 on the outer wall of the connecting tube 56 can slide up and down. The connecting plate 78 hinged on its outer wall is hinged to the outer wall of the control plate 76. When the lifting ring 74 slides, the control plate 76 is driven to slide through the connecting plate 78, thereby causing the clamping block 72 to move closer to or away from the connecting tube 56, thereby achieving clamping and fixing of the dialysate. The extrusion screw 73 on the outer wall of the lifting ring 74 extends into the extrusion groove 75 on the outer wall of the connecting tube 56. Tightening the extrusion screw 73 can fix the lifting ring 74 in the desired position. The limiting rod 77 on the inner side of the fixing ring 71 limits the sliding of the control plate 76 to ensure its stable sliding.

[0021] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0022] 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 portable peritoneal dialysis assisting device, comprising a base plate (1), characterized in that: A fixing rod (2) is fixedly provided on the top surface of the base plate (1); a lifting sleeve (3) is provided on the sliding sleeve of the outer wall of the fixing rod (2); a plurality of self-locking wheels (8) are fixedly provided on the bottom surface of the base plate (1); and a lifting mechanism (4), a dialysis mechanism (5), a placement mechanism (6) and a fixing mechanism (7) are provided above the base plate (1); The dialysis mechanism (5) includes a monitoring unit and a control unit; The monitoring unit includes two intelligent flow monitoring valves (55) and two pallet scales (57), and the control unit includes a control calculator (53); The top surface and outer wall of the lifting sleeve (3) are respectively fixedly provided with two mounting plates (58), and the top surfaces of the two mounting plates (58) are respectively bolted to the outer walls of the two pallet scales (57). The outer wall of the lifting sleeve (3) is fixedly provided with a drawer box (52), and the top surface of the drawer box (52) is fixedly connected to the bottom surface of the control calculator (53). The inner side surfaces of the two mounting plates (58) are respectively fixedly provided with two connecting pipes (56), and the bottom surfaces of the two connecting pipes (56) are respectively bolted to the outer walls of the two intelligent flow monitoring valves (55).

2. The portable peritoneal dialysis assisting device according to claim 1, characterized in that: The lifting mechanism (4) includes a threaded rod (41), the bottom surface of the threaded rod (41) is rotatably connected to the top surface of the base plate (1) through a first bearing seat, a control block (42) is provided on the outer wall of the threaded rod (41), the outer wall of the control block (42) is fixedly connected to the outer wall of the lifting sleeve (3), a rotating rod (45) is rotatably provided on the top surface of the base plate (1) through a second bearing seat, a driving gear (44) is provided on the outer wall fixed sleeve of the rotating rod (45), and a driven gear (43) is provided on the outer wall fixed sleeve of the threaded rod (41), and the tooth surface of the driving gear (44) is meshed with the tooth surface of the driven gear (43).

3. The portable peritoneal dialysis assisting device according to claim 1, characterized in that: The placement mechanism (6) includes two placement racks (61), the bottom surfaces of the two placement racks (61) are fixedly connected to the inner side surfaces of the two pallet scales (57), the outer walls of the two placement racks (61) are fixedly provided with two hooks (62), and the inner side surfaces of the two hooks (62) are respectively slidably penetrated by two pressure rings (65) extending to the outer sides of the two hooks (62).

4. The portable peritoneal dialysis assisting device according to claim 1, characterized in that: The fixing mechanism (7) comprises two groups of clamping blocks (72), the outer walls of the two connecting pipes (56) are respectively fixedly sleeved with two fixing rings (71), the top surfaces of the two fixing rings (71) are respectively slidably connected to the bottom surfaces of the two groups of clamping blocks (72), and the inner side surfaces of the two fixing rings (71) are respectively slidably provided with two groups of control plates (76), the top surfaces of the two groups of control plates (76) are respectively fixedly connected to the bottom surfaces of the two groups of clamping blocks (72).

5. The portable peritoneal dialysis assisting device according to claim 1, characterized in that: The two intelligent flow monitoring valves (55) and the control calculator (53) are respectively connected to two first data lines (54), and the two first data lines (54) are used for information transmission between the two intelligent flow monitoring valves (55) and the control calculator (53). The two pallet scales (57) and the control calculator (53) are respectively connected via two second data lines (59), and the two second data lines (59) are used for information transmission between the two pallet scales (57) and the control calculator (53).

6. The portable peritoneal dialysis assisting device according to claim 1, characterized in that: A drawer (51) is slidably provided on the inner side of the drawer box (52).

7. The portable peritoneal dialysis assisting device according to claim 3, characterized in that: Two extrusion plates (66) are slidably provided on the inner side surfaces of the two placement racks (61), and the outer walls of the two extrusion plates (66) are fixedly connected to the outer walls of the two pressure rings (65). Two dampers (63) and two springs (64) are fixedly provided on the inner side surfaces of the two placement racks (61), and the bottom surfaces of the two dampers (63) and the two springs (64) are fixedly connected to the outer walls of the two extrusion plates (66). The initial states of the two springs (64) are respectively extended.

8. The portable peritoneal dialysis assisting device according to claim 4, characterized in that: Two lifting rings (74) are slidably sleeved on the outer walls of the two connecting pipes (56), and two groups of connecting plates (78) are hingedly provided on the outer walls of the two lifting rings (74). The side surfaces of the two groups of connecting plates (78) close to the two groups of control plates (76) are hingedly connected to the outer walls of the two groups of control plates (76).

9. The portable peritoneal dialysis assisting device according to claim 8, characterized in that: Two extrusion grooves (75) are respectively provided on the outer walls of the two connecting tubes (56); two extrusion screws (73) are respectively threadedly provided on the outer walls of the two lifting rings (74) and extend to the inner walls of the two extrusion grooves (75); two groups of limiting rods (77) are respectively fixedly provided on the inner sides of the two fixing rings (71); and the outer walls of the two groups of limiting rods (77) are respectively slidably connected to the inner sides of the two groups of control plates (76).

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