Bladder irrigation frame for urology department

Abstract

A telescopic mechanism comprises a telescopic column, a plurality of positioning holes are formed in the front end of the telescopic column from top to bottom, a supporting plate is arranged on the rear half section of the upper end of the telescopic column, a positioning piece is arranged below a positioning block, and the positioning piece comprises a pressing section; the upper end of the pressing section is connected with a linear section through a connecting section, the connecting section is located at the opening and rotationally connected with the positioning sleeve, the front end of the upper half portion of the linear section is connected with the rear end of the return spring, and a positioning column used in cooperation with the positioning hole is arranged at the rear end of the upper half portion of the linear section. The lower end of the positioning sleeve is connected with the upper end of the guide cylinder, the telescopic column slidably extends into the guide cylinder, a guide column is arranged in the guide cylinder, and the telescopic column slidably sleeves the guide column through a guide hole; the guide cylinder is sleeved with a supporting frame. The device has the advantages of reducing labor intensity of operators, and being simple in structure, easy to operate, low in manufacturing cost, high in stability, not prone to damage and the like.

Description

Technical Field

[0001] This utility model relates to an auxiliary structure, and more specifically, to a bladder irrigation holder for use in urology. Background Technology

[0002] For patients with indwelling urinary catheters, bacteria can easily proliferate in the bladder and cause infection. Bladder irrigation, by injecting an irrigation solution containing antibiotics or bactericidal substances into the bladder, effectively removes bacteria, mucus, and other impurities, reducing the risk of infection. The irrigation solution is contained in an irrigation container, typically an infusion bag or glass bottle, with common sizes including 500ml and 1000ml. The appropriate capacity is selected based on the irrigation needs. During irrigation, the irrigation container needs to be hung at a high position. Current methods generally involve hanging it directly on a hook on the wall or holding it up manually. Since the hook is fixed to the wall, it is inconvenient to move the hook and the height cannot be adjusted. Holding it up manually is unstable and strenuous. To solve these technical problems, Chinese patent application number CN202223341544.3 provides a method entitled "A Clinically Practical Bladder Irrigation Stand". The proposed solution facilitates the movement of the hook by mounting it on the lifting rod. Furthermore, water is injected into the hollow base to increase its weight, providing stable support for the lifting rod and the bladder irrigation bag on it. When movement is required, the water is drained from the hollow base via a drain pipe, reducing the overall weight of the infusion stand and making it easier to move. Additionally, the height of the lifting rod and hook can be adjusted by turning a handwheel. This solution effectively solves the problems of inconvenient hook movement and height adjustment in existing technologies, while also improving the overall structural stability by injecting water into the hollow base. However, On the one hand, although the hooks in this design are arranged in a circular array around the center line of the lifting rod, seemingly ensuring overall stability, the significant deviation of each hook point from the center line necessitates the hanging of a flushing bag of equal weight on each hook. If a flushing bag is not hung on one side, or if the weight decreases on one side due to bag wear, it will increase the overall structural offset and instability. Furthermore, the adjustable connection between the lifting rod and the sleeve will increase wear between them, reducing their lifespan. On the other hand, while the water-filled hollow seat can improve the overall structural stability to some extent, this also leads to... The structure is relatively heavy, requiring the water in the hollow base to be drained each time it is moved to reduce weight and facilitate movement. This process of draining the water before each use is not only cumbersome but also wasteful of water. Furthermore, the hollow base is a disc structure, meaning that draining the water does not reduce its volume, making storage or transport inconvenient. Additionally, while the height of the lifting rod and hook can be adjusted by turning a handwheel, the handwheel is located in the lower half of the sleeve, requiring bending over for each adjustment, which is very strenuous. Moreover, the handwheel is small due to the overall compact design, resulting in slow height adjustments.

[0003] Therefore, those skilled in the art are dedicated to providing a bladder irrigation stand for urology that can effectively solve the above-mentioned technical problems. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by this utility model is to provide a bladder irrigation stand for urology that can effectively solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides a bladder irrigation frame for urology, including a telescopic mechanism and a guiding mechanism;

[0006] The telescopic mechanism includes a telescopic column, the front end of which has several positioning holes from top to bottom, the upper rear half of which has a support plate, the support plate has a hook, the upper front half of which has an inclined surface, the inclined surface is set with the front lower and the rear higher, and the lower end of which has a guide hole.

[0007] The telescopic column slides through the positioning sleeve. The front end of the positioning sleeve has an opening that extends along the height of the positioning sleeve and penetrates it. A positioning block is provided at the opening, and the inner side of the positioning block is connected to the front end of the return spring. A positioning component is provided below the positioning block. The positioning component includes a pressing section. The upper end of the pressing section is connected to a straight section through a connecting section. The connecting section is located at the opening and is rotatably connected to the positioning sleeve. The front end of the upper half of the straight section is connected to the rear end of the return spring. A positioning column that mates with the positioning hole is provided at the rear end of the upper half of the straight section.

[0008] The guiding mechanism includes a guide cylinder, the lower end of the positioning sleeve is connected to the upper end of the guide cylinder, the telescopic column extends slidably into the guide cylinder, the guide cylinder is provided with a guide column, and the telescopic column is slidably sleeved on the guide column through the guide hole; a support frame is sleeved on the guide cylinder.

[0009] Furthermore, two guide grooves are provided on both sides of the telescopic column, the positioning sleeve includes an anti-rotation part, and arc-shaped parts are symmetrically arranged on both sides of the front end of the anti-rotation part, forming the opening between the two arc-shaped parts. The positioning block is detachably connected to each of the arc-shaped parts, and the connecting section is rotatably connected to each of the arc-shaped parts at the same time. Several guide wheels that cooperate with each of the guide grooves are provided on the inner side of the anti-rotation part.

[0010] Furthermore, there are two hooks connected by a crossbar, the telescopic column has a perforated groove, each positioning hole is opened in the perforated groove, and handles are provided on both sides of the support plate.

[0011] Furthermore, several anti-slip rings are fitted onto the positioning post.

[0012] Furthermore, the pressing section, the connecting section, and the straight section are integrally formed, and reinforcing ribs are provided on both sides of the straight section, with each reinforcing rib extending towards the connecting section.

[0013] Furthermore, the pressing section has a weight-reducing port, and the front end of the pressing section is inclined.

[0014] Furthermore, a positioning plate is provided at the lower end of the positioning sleeve, and the positioning sleeve is detachably connected to the upper end of the guide cylinder through the positioning plate.

[0015] Furthermore, a plastic basket is hung on the upper half of the guide tube.

[0016] Furthermore, a base is detachably provided at the lower end of the guide cylinder, and the guide post is detachably connected to the base by screws. The lower half of the outer wall of the guide post is connected to the inner wall of the guide cylinder by several positioning rods.

[0017] Furthermore, the support frame includes a limiting seat that is slidably sleeved on the guide cylinder. The inner side of the limiting seat has a groove, and a pressing block is provided in the groove. The inner side of the pressing block has several protruding ridges. The outer side of the pressing block is rotatably connected to the inner end of the screw. The screw is threaded through the limiting seat, and a locking disc is provided at the outer end of the screw.

[0018] The upper ends of the three support rods are hinged to the limiting seat, the lower ends of the three support rods are provided with rubber pads, and the middle sections of the three support rods are respectively hinged to the base through connecting rods.

[0019] The beneficial effects of this utility model are as follows: Firstly, by placing the positioning component for adjusting the telescopic column in the middle position of the structure, operators can adjust the height of the telescopic column without bending over, effectively reducing the labor intensity of operators during use. Secondly, when adjusting the height of the telescopic column, it is only necessary to press down on the pressing section to adjust it, which is convenient and quick. Thirdly, when in use, the limiting seat can be slid down directly, the three support rods can be opened at the same time, and then the locking disc can be manually rotated to lock and position it, without the need for water injection, which is more convenient and avoids water waste. When not in use, the limiting seat can be manually rotated to press against the guide cylinder, and then the limiting seat can be pulled up. The seat allows all its support rods to be folded up, and the space after folding is smaller than that of the hollow seat used for water filling in the prior art. This not only makes it easier to carry and move, but also saves space during storage and transportation. Especially when used in the home, where space is limited, it is easier to store without taking up space. In addition, the support plate in this utility model is set at the upper rear half of the telescopic column, and the rinsing bag is hung at the front end, which solves the problem of structural instability caused by the large deviation between the hanging point and the center line of the lifting rod in the prior art. This auxiliary structure not only facilitates movement, but also allows for height adjustment. At the same time, this utility model also has the advantages of simple structure, easy operation, low manufacturing cost, strong stability, and resistance to damage. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0021] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0022] Figure 3 yes Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0023] Figure 4 This is a structural schematic diagram of the present invention without components such as guide cylinders.

[0024] Figure 5 This is a schematic diagram of the structure in this utility model where the positioning sleeve is slidably fitted onto the telescopic column.

[0025] Figure 6 This is a structural schematic diagram of components such as telescopic columns in this utility model.

[0026] Figure 7 This is a schematic diagram of the positioning sleeve installed on the positioning plate.

[0027] Figure 8 yes Figure 7 A magnified schematic diagram of the structure at point C.

[0028] Figure 9 This is a three-dimensional structural diagram of the positioning component in this utility model.

[0029] Figure 10 This is a structural diagram of the positioning sleeve without positioning components or other parts.

[0030] Figure 11 This is a schematic diagram of the structure where the guide post is located inside the guide cylinder.

[0031] Figure 12 This is a schematic diagram of a locking disc installed on a limit seat.

[0032] Figure 13 yes Figure 12 A magnified schematic diagram of the structure at point D in the middle. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0034] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] like Figures 1 to 13 As shown, a bladder irrigation frame for urology includes a telescopic mechanism 1 and a guide mechanism 2. The telescopic mechanism 1 includes a telescopic column 3, with several positioning holes 5 at the front end of the telescopic column 3 from top to bottom. A support plate 6 is provided on the upper rear half of the telescopic column 3, and a hook 7 is provided on the support plate 6. The upper front half of the telescopic column 3 has an inclined surface 8, which is set with the front lower and the rear higher. A guide hole 9 is provided at the lower end of the telescopic column 3. The inclined surface 8 in this utility model can be used to stick information labels.

[0037] The telescopic column 3 slides through the positioning sleeve 10. The positioning sleeve 10 has an opening 11 at its front end, extending along the height of the sleeve and penetrating it. A positioning block 12 is located at the opening 11, and the inner side of the positioning block 12 is connected to the front end of the return spring 13. A positioning element 15 is located below the positioning block 12. The positioning element 15 includes a pressing section 15a, the upper end of which is connected to a straight section 15c via a connecting section 15b. The connecting section 15b is located at the opening 11 and rotates with the... The positioning sleeve 10 is connected, the front end of the upper half of the straight segment 15c is connected to the rear end of the return spring 13, and the rear end of the upper half of the straight segment 15c is provided with a positioning post 16 that cooperates with the positioning hole 5; the guiding mechanism 2 includes a guide cylinder 17, the lower end of the positioning sleeve 10 is connected to the upper end of the guide cylinder 17, the telescopic post 3 extends slidably into the guide cylinder 17, the guide cylinder 17 is provided with a guide post 18, and the telescopic post 3 is slidably sleeved on the guide post 18 through the guide hole 9; a support frame 19 is sleeved on the guide cylinder 17. The telescopic column 3 has two guide grooves 20 on both sides. The positioning sleeve 10 includes an anti-rotation part 21. The front ends of the anti-rotation part 21 are symmetrically provided with arc-shaped parts 22, forming the opening 11 between the two arc-shaped parts 22. The positioning block 12 is detachably connected to each of the arc-shaped parts 22, and the connecting section 15b is rotatably connected to each of the arc-shaped parts 22. The inner side of the anti-rotation part 21 is provided with several guide wheels 23 that cooperate with each of the guide grooves 20. Since the anti-rotation part 21 is not cylindrical, it can effectively prevent the telescopic column 3 from rotating inside the positioning sleeve 10. At the same time, the guide wheels 23 are set to slide in the guide grooves 20 to solve the problem of sliding between the telescopic column 3 and the positioning sleeve 10. This not only has a guiding effect, but also makes it smoother when adjusting the telescopic column 3. There are two hooks 7 connected by a crossbar 26. The telescopic column 3 has perforated slots 53, and each positioning hole 5 is located within one of these slots. Handles 55 are provided on both sides of the support plate 6. These handles 55 facilitate the vertical adjustment of the telescopic column 3. The perforated slots 53 not only further reduce the weight of the telescopic column 3 but also make its structure more compact. Several anti-slip rings 27 are fitted onto the positioning column 16. The anti-slip rings 27 improve stability when the positioning column 16 is inserted into the positioning hole 5.

[0038] The pressing section 15a, the connecting section 15b, and the straight section 15c are integrally formed. Reinforcing ribs 28 are provided on both sides of the straight section 15c, and each reinforcing rib 28 extends towards the connecting section 15b. The integral structure combined with the reinforcing ribs 28 increases the structural strength of the positioning component 15 and makes it less prone to damage. The pressing section 15a has a weight-reducing opening 29, and its front end is inclined. The weight-reducing opening 29 makes the overall weight lighter, and the inclined design of the pressing section 15a makes pressing easier. A positioning plate 30 is provided at the lower end of the positioning sleeve 10, and the positioning sleeve 10 is detachably connected to the upper end of the guide cylinder 17 via the positioning plate 30. This structure allows for easier separation of the positioning sleeve 10 from the guide cylinder 17, facilitating maintenance or parts replacement.

[0039] A plastic basket 31 is hung on the upper half of the guide cylinder 17. The plastic basket 31 can hold disinfectant or other materials according to actual needs. A base 32 is detachably installed at the lower end of the guide cylinder 17. The guide column 18 is detachably connected to the base 32 by screws. The outer wall of the lower half of the guide column 18 is connected to the inner wall of the guide cylinder 17 by several positioning rods 58. The above structure further improves the stability of the guide column 18. The support frame 19 includes a limiting seat 33 that is slidably sleeved on the guide cylinder 17. A groove 35 is opened on the inner side of the limiting seat 33. A pressing block 36 is provided in the groove 35. A number of protruding ridges 37 are provided on the inner side of the pressing block 36. The outer side of the pressing block 36 is rotatably connected to the inner end of the screw 38. The screw 38 is threaded through the limiting seat 33. A locking disc 39 is provided at the outer end of the screw 38.

[0040] The upper ends of the three support rods 50 are hinged to the limiting seat 33, and the lower ends of the three support rods 50 are provided with rubber pads 51. The middle sections of the three support rods 50 are respectively hinged to the base 32 through connecting rods 52. By providing rubber pads 51, the rods are made to fit tightly against the ground, ensuring that they will not move during use and guaranteeing their stability.

[0041] In this invention, the positioning post 16 is located at the rear end of the straight section 15c of the positioning member 15 and cooperates with the positioning hole 5 at the front end of the telescopic post 3. When the positioning post 16 is inserted into the positioning hole 5, it can restrict the up and down movement of the telescopic post 3 in the positioning sleeve 10, thereby fixing the telescopic post 3 at the required height position. This invention not only realizes the height adjustment of the telescopic post 3 through this cooperation method, but also ensures the stability of the bladder irrigation frame during use.

[0042] The upper front end of the straight segment 15c is connected to the rear end of the return spring 13. When the pressing section 15a of the positioning member 15 is pressed down, the straight segment 15c moves outward, causing the positioning post 16 to disengage from the positioning hole 5. At this time, the telescopic post 3 is no longer limited, and the height of the telescopic post 3 can be adjusted. After the pressing section 15a is released, the return spring 13 rebounds, causing the straight segment 15c to return to its original position. (In this utility model, the positioning block 12 and the arc-shaped part 22 are detached and connected. This setting facilitates the inspection and replacement of the return spring 13, avoids damage to the return spring 13 that would lead to the scrapping of the entire structure, and effectively reduces the cost of use.) The positioning post 16 is reinserted into the corresponding positioning hole 5, realizing the automatic positioning of the telescopic post 3. The spring not only makes the insertion and disengagement of the positioning post 16 more convenient, but also ensures a tight fit between the positioning post 16 and the positioning hole 5, enhancing the reliability of positioning.

[0043] In practical use, depending on actual needs, the telescopic column 3 and the positioning sleeve 10 can be designed to fit tightly together, so that there is a certain friction between the telescopic column 3 and the positioning sleeve 10. A certain amount of force is required to adjust them, so that they can work together to bear the weight of the suspended rinsing bag. Although this is not enough to completely prevent the telescopic column 3 from slipping, when the positioning column 16 is inserted into the positioning hole 5, it can be limited by the positioning column 16. At the same time, the telescopic column 3 and the positioning sleeve 10 and other components themselves can bear the weight of the rinsing bag, reduce the pressure between the telescopic column 3 and the positioning sleeve 10, and thus improve the stability and service life of the entire structure.

[0044] The cooperation between the positioning post 16 and the positioning hole 5 can limit the slight displacement of the telescopic post 3 in the vertical direction, reduce the shaking caused by external force or structural deformation, and further enhance the stability of the telescopic post 3 during use, so that it can better support the suspended washing bag.

[0045] The optimal operating principle of this utility model is as follows:

[0046] Slide the limiting seat 33 downwards, simultaneously opening the three support rods 50. After opening each support rod 50, manually rotate the locking disc 39, causing the abutment block 36, which is rotatably connected to the screw 38, to move towards the guide cylinder 17. The abutment block 36 then engages with the guide cylinder 17 via the protrusions 37, thus positioning the disc. Next, adjust its height. The operator holds the handle 55 with one hand and applies pressure inwards to the pressing section 15a with the other. As the pressing section 15a is pressed downwards, its straight section 15c moves outwards. This outward movement of the straight section 15c compresses the return spring 13, which is simultaneously inserted into the positioning... The positioning pin 16 in hole 5 disengages from the positioning hole 5. At this time, the operator can adjust the telescopic pin 3 upward or downward using handle 55. After adjustment, the pressing section 15a is released. At this time, the straight section 15c no longer squeezes the return spring 13 through the pressure of the pressing section 15a. The return spring 13 rebounds, causing the straight section 15c to return to its original position. The return of the straight section 15c causes the positioning pin 16 to move towards the positioning hole 5 and insert into the corresponding positioning hole 5. At this time, the telescopic pin 3 is locked in place by the cooperation of the positioning pin 16 and the positioning hole 5, thereby positioning it. Then, the rinsing bag can be hung on the hook 7.

[0047] In addition, when adjusting the height, the operator holds the handle 55. On the one hand, this is to prevent the telescopic column 3 from slowly sliding down naturally when the positioning column 16 is disengaged from the positioning hole 5 (due to the friction between the telescopic column 3 and the positioning sleeve 10). On the other hand, when the operator holds the handle 55, the downward pressure applied to the telescopic column 3 can be reduced. At this time, squeezing the pressing section 15a makes it easier to disengage the positioning column 16 from the positioning hole 5.

[0048] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A bladder irrigation stand for use in urology, characterized in that: It includes a telescopic mechanism (1) and a guiding mechanism (2); The telescopic mechanism (1) includes a telescopic column (3), the front end of the telescopic column (3) is provided with a number of positioning holes (5) from top to bottom, the upper rear half of the telescopic column (3) is provided with a support plate (6), the support plate (6) is provided with a hook (7), the upper front half of the telescopic column (3) has an inclined surface (8), the inclined surface (8) is set with the front lower and the rear higher, and the lower end of the telescopic column (3) is provided with a guide hole (9). The telescopic column (3) slides through the positioning sleeve (10). The front end of the positioning sleeve (10) has an opening (11). The opening (11) extends along the height of the positioning sleeve (10) and passes through the positioning sleeve (10). A positioning block (12) is provided at the opening (11). The inner side of the positioning block (12) is connected to the front end of the return spring (13). A positioning element (15) is provided below the positioning block (12). The device includes a pressing section (15a), the upper end of which is connected to a straight section (15c) via a connecting section (15b). The connecting section (15b) is located at the opening (11) and is rotatably connected to the positioning sleeve (10). The front end of the upper half of the straight section (15c) is connected to the rear end of the return spring (13). The rear end of the upper half of the straight section (15c) is provided with a positioning post (16) that cooperates with the positioning hole (5). The guiding mechanism (2) includes a guide cylinder (17), the lower end of the positioning sleeve (10) is connected to the upper end of the guide cylinder (17), the telescopic column (3) extends slidably into the guide cylinder (17), a guide column (18) is provided inside the guide cylinder (17), and the telescopic column (3) is slidably sleeved on the guide column (18) through the guide hole (9); a support frame (19) is sleeved on the guide cylinder (17).

2. The bladder irrigation stand for urology as described in claim 1, characterized in that: The telescopic column (3) has two guide grooves (20) on both sides. The positioning sleeve (10) includes an anti-rotation part (21). The front end of the anti-rotation part (21) is symmetrically provided with arc-shaped parts (22). The opening (11) is formed between the two arc-shaped parts (22). The positioning block (12) is detachably connected to each of the arc-shaped parts (22). The connecting section (15b) is rotatably connected to each of the arc-shaped parts (22). The inner side of the anti-rotation part (21) is provided with a number of guide wheels (23) that cooperate with each of the guide grooves (20).

3. The bladder irrigation stand for urology as described in claim 2, characterized in that: There are two hooks (7), and the two hooks (7) are connected by a crossbar (26). The telescopic column (3) is provided with a perforated groove (53), and each of the positioning holes (5) is provided in the perforated groove (53). The support plate (6) is provided with handles (55) on both sides.

4. The bladder irrigation stand for urology as described in claim 3, characterized in that: Several anti-slip rings (27) are fitted on the positioning post (16).

5. The bladder irrigation stand for urology as described in claim 4, characterized in that: The pressing section (15a), the connecting section (15b), and the straight section (15c) are integrally formed. The straight section (15c) is provided with reinforcing ribs (28) on both sides, and each reinforcing rib (28) extends toward the connecting section (15b).

6. The bladder irrigation stand for urology as described in claim 5, characterized in that: The pressing section (15a) is provided with a weight reduction port (29), and the front end of the pressing section (15a) is inclined.

7. The bladder irrigation stand for urology as described in claim 6, characterized in that: The lower end of the positioning sleeve (10) is provided with a positioning plate (30), and the positioning sleeve (10) is detachably connected to the upper end of the guide cylinder (17) through the positioning plate (30).

8. The bladder irrigation stand for urology as described in claim 7, characterized in that: A plastic basket (31) is hung on the upper half of the guide tube (17).

9. The bladder irrigation stand for urology as described in claim 8, characterized in that: The lower end of the guide cylinder (17) is detachably provided with a base (32), and the guide post (18) is detachably connected to the base (32) by screws. The lower half of the outer wall of the guide post (18) is connected to the inner wall of the guide cylinder (17) by several positioning rods (58).

10. The bladder irrigation stand for urology as described in claim 9, characterized in that: The support frame (19) includes a limiting seat (33) slidably sleeved on the guide cylinder (17). The limiting seat (33) has a groove (35) on its inner side. A pressing block (36) is provided in the groove (35). The pressing block (36) has several protruding ridges (37) on its inner side. The outer side of the pressing block (36) is rotatably connected to the inner end of the screw (38). The screw (38) is threaded through the limiting seat (33). A locking disc (39) is provided at the outer end of the screw (38). The upper ends of the three support rods (50) are hinged to the limiting seat (33). The lower ends of the three support rods (50) are provided with rubber pads (51). The middle sections of the three support rods (50) are respectively hinged to the base (32) through connecting rods (52).

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