A constant pressure water supply system for aquaculture drinking water lines

Abstract

This invention relates to the field of poultry farming facilities technology, and discloses a constant pressure water supply system for poultry drinking water lines. The system includes a constant pressure water supply unit with two connectors at the top, each connector having a flexible hose at the other end. A protective shell is fixedly installed in the middle of the outer wall of each connector. An adjusting nut is rotatably connected to a connecting frame near the protective shell. A drive turntable is rotatably connected to one end of the connecting frame inside the protective shell. Clamping components are slidably connected to the side of the drive turntable. By turning the adjusting nut, the drive turntable and clamping components move synchronously to the right, causing a sliding column to slide inside a spiral groove, rotating the sealing ring and the rotating ring. The rotating ring, located on the side wall of the inclined groove, presses against a second sliding column, pushing the second sliding column and the sliding seat along the guide rail, causing the arc-shaped clamping plate to fit against the surface of the flexible hose. This system offers advantages such as convenient and quick connection between the pressure regulating water supply unit and the water pipe, and good sealing performance.

Description

Technical Field

[0001] This invention relates to the field of poultry farming facilities technology, specifically to a constant pressure water supply system for poultry drinking water lines. Background Technology

[0002] Cage rearing primarily involves raising chickens in cages to achieve a high-density, high-efficiency farming model. During chicken rearing, nipple-type drinking lines are typically used for water supply. When a chicken's beak touches the water nozzle, water flows out, ensuring the animals always have access to fresh drinking water. A pressure regulator is usually installed on the nipple-type drinking line to ensure stable water pressure throughout the entire system.

[0003] As chickens change size during the rearing process, their water needs also increase. A constant pressure water supply can be achieved by frequently adjusting the water pressure in the drinking pipe using a pressure regulating water supply device. Conventional pressure regulating water supply devices are typically connected to water pipes via threads, reinforced with PTFE tape for sealing. This connection method requires adjusting the length of the PTFE tape wrapping, which is cumbersome. Furthermore, as the PTFE tape ages, leaks can occur between the pressure regulating water supply device and the water pipe, affecting the device's pressure regulation effectiveness. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a constant pressure water supply system for aquaculture drinking water lines.

[0005] This invention provides the following technical solution: a constant pressure water supply system for aquaculture drinking water lines, comprising a constant pressure water supply device, two connectors connected to the top of the constant pressure water supply device, and a flexible hose sleeved at the other end of each connector; a protective shell fixedly installed in the middle of the outer wall of each connector, and threads provided on the outer wall surface of the connector, the connector being threadedly connected to an adjusting nut, the adjusting nut being located between the protective shell and the constant pressure water supply device, a connecting frame rotatably connected to the side of the adjusting nut near the protective shell, the connecting frame being slidably connected to the protective shell; a drive turntable rotatably connected to one end of the connecting frame inside the protective shell, two sets of spiral grooves arrayed through the circumference of the protective shell, two sliding columns fixedly installed on the outer wall of the drive turntable, the sliding columns being slidably connected within the spiral grooves; a clamping assembly slidably connected to the side of the drive turntable, the clamping assembly being slidably connected to the inner side of the connecting frame, the drive turntable driving the clamping assembly to move towards the surface of the flexible hose during rotation.

[0006] Preferably, a first convex ring and a second convex ring are fixedly installed on the outer wall of the end of the connector away from the constant pressure water supply device. The first convex ring is located to the left of the second convex ring. The outer diameter of the first convex ring gradually decreases from left to right, and the outer diameter of the second convex ring gradually increases from left to right. Friction rings are fixedly arranged on the outer wall of the second convex ring. The cross-section of the friction ring is a right-angled triangle with the hypotenuse facing to the left.

[0007] Preferably, the connecting frame includes an inner ring fixedly installed on the left side of the adjusting nut, and an outer ring rotatably connected to the outer side of the inner ring. The inner ring has an L-shaped cross-section, and the outer ring has an H-shaped cross-section. Four sets of sliding rods are fixedly arranged on the left side of the outer ring, and an annular cover is fixedly installed on the left end of the sliding rod. The annular cover has four sets of arc-shaped grooves arranged through its circumference. Four sets of sliding holes are arranged through its right side of the protective shell, and the sliding rods are slidably connected in the sliding holes.

[0008] Preferably, the drive turntable includes a sealing ring sleeved on the outside of the annular cover, a sliding column is fixedly installed on the outer wall of the sealing ring, four sets of connecting blocks are fixedly arranged on the inner wall of the sealing ring, a rotating ring is fixedly installed between the four sets of connecting blocks, and an inclined groove is arranged through the side of the rotating ring.

[0009] Preferably, the inner diameter of the sealing ring is equal to the outer diameter of the annular cover, the outer diameter of the sealing ring is equal to the inner diameter of the protective cylinder shell, the outer wall of the rotating ring is attached to the inner wall of the annular cover, and the inner diameter of the rotating ring is equal to the inner diameter of the annular cover.

[0010] Preferably, the clamping assembly includes six sets of guide rails arrayed and fixed on the left side wall of the annular cover. Each guide rail is slidably connected to a slide block. A second slide column is fixedly installed on the right side of the slide block. The second slide column is slidably connected in an inclined groove. An arc-shaped clamping plate is fixedly installed at one end of the slide block. The arc-shaped clamping plate is attached to the surface of the hose.

[0011] Preferably, the right end of the arc-shaped clamp is provided with an inclined portion, and the inclination angle of the inclined portion is the same as the inclination angle of the outer wall of the second convex ring.

[0012] Preferably, the limiting component includes a protective shell fixedly installed on the right side of the protective cylinder shell, two crossbars fixedly installed between the left and right side walls of the protective shell, one of which is a sliding rod passing through the protective shell, and an annular friction strip is sleeved on the outer side of the two crossbars and the sliding rod, with the sliding rod fitting against the inner surface of the annular friction strip; a fixing nut is provided on the top of the protective shell, and a bolt is internally threaded into the fixing nut, with the bottom end of the bolt abutting against the outer surface of the annular friction strip.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This constant pressure water supply system for aquaculture drinking water lines, by turning the adjusting nut, causes the adjusting nut to rotate and move to the right simultaneously. Under the connecting action of the connecting frame, the drive turntable and clamping assembly move to the right synchronously. The first sliding column slides inside the spiral groove, causing the sealing ring and rotating ring to rotate. The rotating ring, located on the side wall of the inclined groove, compresses the second sliding column and pushes the second sliding column and the sliding seat along the guide rail, causing the arc-shaped clamping plate to adhere to the surface of the hose. The arc-shaped clamping plate increases the compressive force on the hose while pushing the hose to the right. The arc-shaped clamping plate compresses the hose from the outside, while the second convex ring and friction ring support the hose from the inside, causing the hose to deform, thereby eliminating friction between the second convex ring and the hose. The gap between the ring and the hose ensures a good seal, providing convenient and quick connection between the pressure regulator and the water pipe, and a stable seal. This constant pressure water supply system for aquaculture drinking water lines uses an arc-shaped clamp to press against the hose surface while simultaneously pushing the hose to the right. In addition to applying pressure, the arc-shaped clamp also applies a thrust to the hose, preventing it from moving to the left and ensuring a stable connection between the hose and the connector. Furthermore, the constant pressure water supply system for aquaculture drinking water lines uses a ring-shaped friction belt to exert friction on the sliding rod, suppressing the left and right movement of the connecting frame and providing good positioning. This prevents the adjusting nut from loosening its threads on the connector surface during use, ensuring that the drive turntable and clamping components remain in their current positions and guaranteeing a secure hold on the hose. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the constant pressure water supply system used for aquaculture drinking water lines in the embodiment.

[0015] Figure 2 This is a three-dimensional structural diagram of the constant pressure water supply system used for aquaculture drinking water line in the embodiment after removing the constant pressure water supply device;

[0016] Figure 3 This is a schematic diagram of the main cross-sectional structure of the constant pressure water supply system for aquaculture drinking water line in the embodiment after removing the constant pressure water supply device;

[0017] Figure 4 This is a schematic diagram of the constant pressure water supply system for aquaculture drinking water lines in the embodiment, with the connector and hose separated.

[0018] Figure 5 This is a three-dimensional structural diagram of the constant pressure water supply system for aquaculture drinking water line in the embodiment, with the protective shell and connector separated.

[0019] Figure 6 This is a three-dimensional structural diagram of the connecting frame of the constant pressure water supply system used for the aquaculture drinking water line in the embodiment.

[0020] Figure 7This is a three-dimensional structural diagram of the drive turntable and clamping components of the constant pressure water supply system used in the aquaculture drinking water line in the embodiment.

[0021] Figure 8 This is a schematic diagram of the drive turntable structure of the constant pressure water supply system used in the aquaculture drinking water line in the embodiment.

[0022] Figure 9 This is a three-dimensional structural diagram of the limiting component of the constant pressure water supply system used in the aquaculture drinking water line in the embodiment.

[0023] In the diagram: 100, constant pressure water supply device; 200, connector; 300, hose; 400, protective shell; 500, adjusting nut; 600, connecting frame; 700, drive turntable; 800, clamping assembly; 900, limit assembly; 201, convex ring one; 202, convex ring two; 203, friction ring; 401, sliding hole; 402, spiral groove;

[0024] 601. Inner ring; 602. Outer ring; 603. Slide rod; 604. Annular cover; 605. Arc groove; 701. Sealing ring; 702. Slide post one; 703. Connecting block; 704. Rotary ring; 705. Inclined groove; 801. Guide rail; 802. Slide seat; 803. Slide post two; 804. Arc clamp; 805. Inclined part; 901. Protective shell; 902. Crossbar; 903. Annular friction band; 904. Fixing nut; 905. Bolt. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example: See Figures 1-9 A constant pressure water supply system for aquaculture drinking water lines includes a constant pressure water supply unit 100. Two connectors 200 are connected to the top of the constant pressure water supply unit 100, and a flexible hose 300 is fitted onto the other end of each connector 200. One flexible hose 300 serves as an inlet pipe, and the other flexible hose 300 serves as an outlet pipe. A protective shell 400 is fixedly installed in the middle of the outer wall of the connector 200. The outer wall surface of the connector 200 is threaded, and the connector 200 is threadedly connected to an adjusting nut 500, which is located between the protective shell 400 and the constant pressure water supply unit 100.

[0027] A connecting frame 600 is rotatably connected to the adjusting nut 500 near the protective shell 400, and the connecting frame 600 is slidably connected to the protective shell 400. During the tightening of the adjusting nut 500, the connecting frame 600 rotates relative to the adjusting nut 500, and the lateral displacement of the adjusting nut 500 causes the connecting frame 600 to slide relative to the protective shell 400. A drive turntable 700 is rotatably connected to one end of the connecting frame 600 inside the protective shell 400. Two sets of spiral grooves 402 are arrayed on the circumferential surface of the protective shell 400, and two sliding pins 702 are fixedly installed on the outer wall of the drive turntable 700, slidingly connected within the spiral grooves 402. Therefore, as the connecting frame 600 slides to the right relative to the protective shell 400, the sliding pins 702 slide within the spiral grooves 402, causing the sliding pins 702 to rotate and move to the right simultaneously.

[0028] The drive turntable 700 has a side array of slidably connected clamping components 800, which are slidably connected to the inner side of the connecting frame 600. During the rotation of the drive turntable 700, the clamping components 800 are driven to move towards the surface of the hose 300, thereby clamping the hose 300 onto its surface and compressing it. Simultaneously, the clamping components 800 move to the right along with the connecting frame 600, thus simultaneously compressing and pushing the hose 300 to the right, ensuring a tight connection between the hose 300 and the connector 200.

[0029] See Figures 3-4 A first convex ring 201 and a second convex ring 202 are fixedly installed on the outer wall of the connector 200 away from the constant pressure water supply device 100. The first convex ring 201 is located to the left of the second convex ring 202. The outer diameter of the first convex ring 201 gradually decreases from left to right, while the outer diameter of the second convex ring 202 gradually increases from left to right. Friction rings 203 are fixedly arranged in an array on the outer wall of the second convex ring 202. The cross-section of the friction rings 203 is a right-angled triangle with the hypotenuse facing to the left. Initially, the clamping assembly 800 is located between the first convex ring 201 and the second convex ring 202. When the clamping assembly 800 squeezes the hose 300 and pushes the hose 300 to the right, the mutual squeezing force between the hose 300 and the second convex ring 202 gradually increases, ensuring the sealing effect between the hose 300 and the second convex ring 202. The setting of the friction rings 203 further enhances the sealing effect between the hose 300 and the second convex ring 202.

[0030] See Figures 5-7The connecting frame 600 includes an inner ring 601 fixedly installed on the left side of the adjusting nut 500. An outer ring 602 is rotatably connected to the outside of the inner ring 601. The inner ring 601 has an L-shaped cross-section, and the outer ring 602 has an H-shaped cross-section. This allows the outer ring 602 to be fitted onto the outside of the inner ring 601, and the outer ring 602 can rotate relative to the inner ring 601. Four sets of sliding rods 603 are fixedly arranged in an array on the left side of the outer ring 602, and four sets of sliding holes 401 are arranged through the right side of the protective shell 400. The sliding rods 603 are slidably connected in the sliding holes 401. An annular cover 604 is fixedly installed on the left end of the sliding rod 603, and the annular cover 604 is located inside the protective shell 400. Four sets of arc-shaped grooves 605 are arranged through the circumference of the annular cover 604.

[0031] See Figures 6-8 The drive turntable 700 includes a sealing ring 701 fitted around the outer side of the annular cover 604. The inner diameter of the sealing ring 701 is equal to the outer diameter of the annular cover 604, and the outer diameter of the sealing ring 701 is equal to the inner diameter of the protective cylinder shell 400. Two sliding pins 702 are fixedly installed on the outer wall of the sealing ring 701, and the two sliding pins 702 are symmetrical about the center of the sealing ring 701. Four sets of connecting blocks 703 are fixedly arranged on the inner wall of the sealing ring 701, and a rotating ring 704 is fixedly installed between the four sets of connecting blocks 703. The outer wall of the rotating ring 704 is fitted against the inner wall of the annular cover 604, and the inner diameter of the rotating ring 704 is equal to the inner diameter of the annular cover 604. Inclined grooves 705 are arranged through the side of the rotating ring 704.

[0032] See Figure 7 The clamping assembly 800 includes six sets of guide rails 801 arrayed and fixed on the left side wall of the annular cover 604. Each guide rail 801 has a slide block 802 slidably connected inside it. Each guide rail 801 consists of two U-shaped groove plates. The width of the left and right sides of the slide block 802 is smaller than the width of its middle part, so that the left and right sides of the slide block 802 are slidably connected to the two groove plates respectively. Moreover, the right side of the middle part of the slide block 802 is flush with the right side of the guide rail 801, and the rotating ring 704 fits against the right side of the guide rail 801 and the slide block 802.

[0033] A second sliding column 803 is fixedly installed on the right side of the slide block 802. The second sliding column 803 is slidably connected in the inclined groove 705. An arc-shaped clamping plate 804 is fixedly installed at one end of the slide block 802. During the sliding of the rotating ring 704, the rotating ring 704, located on the side wall of the inclined groove 705, squeezes the second sliding column 803, causing the slide block 802 to slide along the guide rail 801, so that the arc-shaped clamping plate 804 fits against the surface of the hose 300. An inclined part 805 is provided at the right end of the arc-shaped clamping plate 804. The inclined angle of the inclined part 805 is the same as the inclined angle of the outer wall of the second convex ring 202. Thus, the inclined part 805 cooperates with the second convex ring 202 to clamp the hose 300, preventing the end of the hose 300 from bending or being damaged when the arc-shaped clamping plate 804 clamps the hose 300 and pushes it to the right.

[0034] See Figure 9 The limiting component 900 includes a protective shell 901 fixedly installed on the right side of the protective shell 400. Two crossbars 902 are fixedly installed between the left and right side walls of the protective shell 901. One of the crossbars 902 and the slide bar 603 passes through the protective shell 901. An annular friction band 903 is sleeved on the outer side of the two crossbars 902 and the slide bar 603, and the slide bar 603 is in contact with the inner surface of the annular friction band 903. A fixing nut 904 is provided on the top of the protective shell 901. A bolt 905 is internally threaded into the fixing nut 904. The bottom end of the bolt 905 abuts against the outer surface of the annular friction band 903. By tightening the bolt 905, the bolt 905 pushes the annular friction band 903 downward, thereby increasing the pressure between the annular friction band 903 and the slide bar 603, and thus increasing the friction between the annular friction band 903 and the slide bar 603, inhibiting the slide bar 603 from sliding relative to the protective shell 400.

[0035] In use, firstly, the hose 300 is fitted onto the outside of the first convex ring 201 and pushed to the right, moving the end of the hose 300 to the left end of the second convex ring 202; at this time, the hose 300 is directly below the arc-shaped clamping plate 804; then, the adjusting nut 500 is turned, causing it to rotate and move to the right, the inner ring 601 rotates synchronously, and drives the outer ring 602, the slide rod 603 and the annular cover 604 to move to the right, driving the turntable 700 and the clamping assembly 800 to move to the right along with the annular cover 604; during the process of driving the turntable 700 to move to the right, the first slide rod 702 slides inside the spiral groove 402, causing the sealing ring 701 and the rotating ring 704 to rotate; the rotating ring 704, located on the side wall of the inclined groove 705, squeezes the second slide rod 803 and pushes the second slide rod 803. 803 and slide 802 slide along guide rail 801, causing arc-shaped clamp 804 to fit against the surface of hose 300; then, clamping assembly 800 moves to the right along with annular cover 604, thereby increasing the squeezing force on hose 300 while pushing hose 300 to the right; so that the right end of hose 300 is fitted over the outside of convex ring 202, and the friction ring 203 ensures the firmness of the connection between hose 300 and connector 200; and the arc-shaped clamp 804 squeezes hose 300 from the outside, while convex ring 202 and friction ring 203 support hose 300 from the inside, causing hose 300 to deform, thereby eliminating gaps between convex ring 202 and hose 300, and between friction ring 203 and hose 300, ensuring a sealing effect. In this embodiment, the constant pressure water supply system used for the aquaculture drinking water line was tested by frequently adjusting the water supply test pressure of the drinking water pipe (0.6 MPa water pressure held for 1 minute to 1 MPa water pressure held for 1 minute, switching repeatedly). After maintaining the pressure for ten consecutive days, there was no leakage at the connection.

[0036] Furthermore, this constant pressure water supply unit can be an intelligent water supply unit capable of automatic control, and its control system can be equipped with:

[0037] The constant pressure water supply interface displays up to 8 columns of the set pressure value, actual pressure value, and allowable error value of the constant pressure water supply system for 12 floors. The actual pressure value can also be displayed in a bar chart. Clicking the operation will enlarge the bar chart display of the interface and allow you to set the pressure value, actual pressure value, and allowable error value.

[0038] The manual setting interface allows each constant pressure water supply unit to be operated manually, and the pressure adjustment value can be set as needed (the adjustment value is displayed as a percentage using a sliding switch).

[0039] The phased automatic pressure adjustment interface allows users to freely set the required water level and pressure values ​​based on the age of the fish. For example, the default water level is 5cm for 1-day-old fish, 10cm for 7-day-old fish, 15cm for 14-day-old fish, 20cm for 21-day-old fish, 25cm for 28-day-old fish, and 30cm for 35-day-old fish. Users can also freely set the water level for the day and for specific time periods. For example, the default water level is 10cm from 0:00 to 4:00, 45cm from 4:00 to 8:00, 25cm from 8:00 to 11:00, 45cm from 11:00 to 13:00, 20cm from 13:00 to 17:00, 45cm from 17:00 to 19:00, and 10cm from 19:00 to 0:00. A maximum of 8 time periods can be set.

[0040] During the breeding cycle, the amount of water required for chickens to grow varies at different stages. The pressure of the constant pressure water supply device is adjusted as needed, and the water pressure value required for different ages is set to ensure the stability of drinking water and growth of the chickens, achieve scientific breeding, and save costs.

Claims

1. A constant pressure water supply system for aquaculture drinking water lines, comprising a constant pressure water supply unit (100), characterized in that: The constant pressure water supply device (100) has two connectors (200) connected to its top, and the other end of each connector (200) is fitted with a flexible hose (300). A protective cylinder shell (400) is fixedly installed in the middle of the outer wall of the connector (200). The outer wall surface of the connector (200) is provided with threads. The connector (200) is threadedly connected to the adjusting nut (500) through the threads. The adjusting nut (500) is located between the protective cylinder shell (400) and the constant pressure water supply device (100). A connecting frame (600) is rotatably connected to the side of the adjusting nut (500) near the protective cylinder shell (400). The connecting frame (600) is slidably connected to the protective cylinder shell (400). A drive turntable (700) is rotatably connected to one end of the connecting frame (600) inside the protective cylinder shell (400). Two sets of spiral grooves (402) are arrayed through the circumference of the protective cylinder shell (400). Two sliding columns (702) are fixedly installed on the outer wall of the drive turntable (700). A (702) is slidably connected in a spiral groove (402); a clamping assembly (800) is slidably connected to the side of the drive turntable (700), the clamping assembly (800) is slidably connected to the inside of the connecting frame (600), and the drive turntable (700) drives the clamping assembly (800) to move toward the surface of the hose (300) during rotation; a convex ring one (201) and a convex ring two (202) are fixedly installed on the outer wall of the end of the connector (200) away from the constant pressure water supply device (100), the convex ring one (201) is located to the left of the convex ring two (202), the outer diameter of the convex ring one (201) gradually decreases from left to right, the outer diameter of the convex ring two (202) gradually increases from left to right, and a friction ring (203) is fixedly arranged on the outer wall of the convex ring two (202), the cross-section of the friction ring (203) is a right triangle, and the hypotenuse faces to the left; The connecting frame (600) includes an inner ring (601) fixedly installed on the left side of the adjusting nut (500), and an outer ring (602) rotatably connected to the outside of the inner ring (601). The inner ring (601) has an L-shaped cross-section, and the outer ring (602) has an H-shaped cross-section. Four sets of sliding rods (603) are fixedly arranged on the left side of the outer ring (602), and an annular cover (604) is fixedly installed on the left end of the sliding rod (603). The annular cover (604) has four sets of arc-shaped grooves (605) arranged through the circumference of the annular cover (604). Four sets of sliding holes (401) are arranged through the right side of the protective shell (400), and the sliding rods (603) are slidably connected in the sliding holes (401). The drive turntable (700) includes a sealing ring (701) sleeved on the outside of the annular cover (604), a sliding column (702) is fixedly installed on the outer wall of the sealing ring (701), and four sets of connecting blocks (703) are fixedly arranged on the inner wall of the sealing ring (701). A rotating ring (704) is fixedly installed between the four sets of connecting blocks (703), and an inclined groove (705) is arranged through the side of the rotating ring (704).

2. The constant pressure water supply system according to claim 1, characterized in that: The inner diameter of the sealing ring (701) is equal to the outer diameter of the annular cover (604), the outer diameter of the sealing ring (701) is equal to the inner diameter of the protective cylinder shell (400), the outer wall of the rotating ring (704) is attached to the inner wall of the annular cover (604), and the inner diameter of the rotating ring (704) is equal to the inner diameter of the annular cover (604).

3. The constant pressure water supply system according to claim 1, characterized in that: The clamping assembly (800) includes six sets of guide rails (801) fixed in an array on the left side wall of the annular cover (604). Each guide rail (801) is slidably connected to a slide block (802). A slide column (803) is fixedly installed on the right side of the slide block (802). The slide column (803) is slidably connected in an inclined groove (705). An arc-shaped clamping plate (804) is fixedly installed at one end of the slide block (802). The arc-shaped clamping plate (804) is attached to the surface of the hose (300).

4. The constant pressure water supply system according to claim 3, characterized in that: The right end of the arc-shaped clamp (804) is provided with an inclined part (805), and the inclined angle of the inclined part (805) is the same as the inclined angle of the outer wall of the second convex ring (202).

5. The constant pressure water supply system according to claim 1, characterized in that: The limiting assembly (900) includes a protective shell (901) fixedly installed on the right side of the protective cylinder shell (400). Two crossbars (902) are fixedly installed between the left and right side walls of the protective shell (901). One of the sliding rods (603) passes through the protective shell (901). An annular friction belt (903) is sleeved on the outside of the two crossbars (902) and the sliding rod (603). The sliding rod (603) fits against the inner surface of the annular friction belt (903). A fixing nut (904) is provided on the top of the protective shell (901). A bolt (905) is internally threaded into the fixing nut (904). The bottom end of the bolt (905) abuts against the outer surface of the annular friction belt (903).

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