A power-off self-locking pinch valve, system and dialysis apparatus thereof

Abstract

The application discloses a kind of power-off self-locking pinch valve and system, including pinch valve body and retractable assembly nuclear self-locking assembly being arranged in pinch valve body, the outer wall of pinch valve body is provided with the clamping groove for clamping pipeline, retractable assembly has first position and second position, self-locking assembly is located in the hollow cavity of shell, when system power-off, retractable assembly is in first position, self-locking assembly applies self-locking torque to retractable assembly, and makes retractable assembly maintain in first position, at this time, pipeline is clamped closed;When system is powered on, self-locking assembly is released, so that the retractable assembly returns to second position, at this time, pipeline is released. By self-locking assembly to retractable assembly exert self-locking torque, second magnet and second magnet need not be powered on all the time in the treatment process lasting several hours, so as to reduce energy consumption, avoid security risk because of device overheating, in addition, the system can clamp pipeline instantly, improve the efficiency of pipeline clamping.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a power-off self-locking clamp valve, system, and dialysis equipment thereof. Background Technology

[0002] Electromagnetic clamp valves utilize electromagnetic properties. A piston moves within the valve body via electromagnetic force and a spring, clamping the tubing to achieve both opening and closing. Currently, electromagnetic clamp valves are widely used in medical devices, particularly blood processing equipment such as hemodialysis machines or CRRT devices. To ensure treatment safety, when the system detects abnormalities (such as tubing leakage, air bubbles, or abnormal power failure), it is necessary to safely and reliably clamp the tubing to control blood flow. When the electromagnetic clamp valve is open, liquid can flow through the tubing; when closed, the tubing is clamped and sealed, preventing further liquid flow. However, these electromagnetic clamp valves require continuous power during treatments lasting several hours or even tens of hours, resulting in high power consumption and significant heat generation over prolonged use, posing certain safety hazards. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the prior art, the present invention aims to provide a power-off self-locking clamp valve, which applies a self-locking torque to the telescopic component through the self-locking component, so that the clamp valve does not need to be continuously energized during the treatment process, thereby reducing energy consumption and avoiding safety hazards caused by overheating of the device.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a power-off self-locking pinch valve, characterized in that it comprises: The clamp valve body has a hollow cavity along its length, and the outer wall of the clamp valve body has a clamping groove for clamping the pipeline. The telescopic component is located in the hollow cavity of the pinch valve body, and the telescopic component has two states in the cavity: a first position and a second position. The self-locking assembly is located within the hollow cavity of the housing and is situated on one side of the telescopic assembly; The telescopic assembly includes a second magnet, a second piston rod, a push rod, and a second elastic element. The second magnet has a through-hole along the length of the clamp valve body. The second piston rod is movably located within the second piston hole, with one end extending outward to the outside of the second magnet and the other end extending outward and penetrating to the outside of the clamp valve body. One end of the push rod is fixedly connected to the other end of the second piston rod, and a self-locking hole for cooperating with a self-locking assembly is provided on the outer wall of the push rod. The second elastic element is sleeved on the second piston rod and located on the side close to the push rod. When the system is powered off, the telescopic assembly is in the first position, the second piston rod drives the push rod to move linearly, the second elastic element is compressed, the self-locking assembly applies a self-locking torque to the telescopic assembly and keeps the telescopic assembly in the first position, at which time the pipeline is clamped; when the system is powered on, the self-locking torque applied by the self-locking assembly to the push rod is released, the second piston rod drives the push rod to move linearly, the second elastic element is reset, the telescopic assembly returns to the second position, at which time the pipeline is released.

[0005] As a further improvement of the present invention, the self-locking component includes: A first magnet, wherein the first magnet has a through first piston hole along the width direction of the clamp valve body; The first piston rod is movably located within the first piston hole. One end of the first piston rod extends outward to the outside of the first magnet and close to the side of the telescopic assembly. The other end of the first piston rod extends outward and penetrates to the outside of the clamp valve body. The first elastic element is sleeved on the first piston rod and is disposed on the side close to the telescopic assembly. When the system is powered off, the first elastic element is released, the first piston rod is locked into the self-locking hole, the self-locking assembly applies a self-locking torque to the push rod, and the push rod clamps the pipeline. At this time, the telescopic assembly is in the first position. When the system is powered on, the first piston rod retracts, the first elastic element is compressed, the self-locking hole is misaligned with the first piston rod, and the push rod releases the pipeline. At this time, the telescopic assembly is in the second position.

[0006] As a further improvement of the present invention, a first baffle is fixedly provided on the outer peripheral wall of the first piston rod near the telescopic assembly, and the first elastic element is located between the first baffle and the first magnet.

[0007] As a further improvement of the present invention, the first elastic element is a first spring, and the diameter of the first spring gradually increases from the end away from the first magnet to the end closer to the first magnet.

[0008] As a further improvement of the present invention, a pressure head is connected to the end of the push rod away from the telescopic assembly, and the pressure head is perpendicularly connected to the push rod.

[0009] As a further improvement of the present invention, the end of the pressure head is wedge-shaped; when the telescopic assembly is in the first position, the end of the pressure head is located in the clamping groove, and when the telescopic assembly is in the second position, the end of the pressure head is flush with the upper side of the clamping groove.

[0010] As a further improvement of the present invention, a Hall sensor is provided in the hollow cavity of the pinch valve body, and the Hall sensor is located on one side of the free end of the push rod or the second piston rod.

[0011] As a further improvement of the present invention, a second baffle is fixedly provided on the outer peripheral wall of the second piston rod near the push rod end, and the second elastic member is located between the second baffle and the second magnet.

[0012] As a further improvement of the present invention, the second elastic element is a second spring, and the diameter of the second spring gradually increases from the end away from the second magnet to the end closer to the second magnet.

[0013] As a further improvement of the present invention, a plate is provided at one end of the push rod near the second piston rod, and a slot adapted to the plate is provided at one end of the second piston rod near the push rod, wherein the width of the plate is greater than the outer diameter of the second piston rod.

[0014] As a further improvement of the present invention, the clamp valve body includes a separable upper shell and a lower shell, the upper shell and the lower shell being closed to form a hollow cavity for accommodating the telescopic component and the self-locking component, and the first magnet and the second magnet are respectively fixedly installed in the lower shell by a support frame.

[0015] As a further improvement of the present invention, the upper housing and the lower housing are respectively provided with semi-circular grooves adapted to the push rod on one side of the inner wall, and the two semi-circular grooves are joined together to form a limiting groove for restricting the push rod.

[0016] As a further improvement of the present invention, the attraction force of the first magnet is 1-20N, and the attraction force of the second magnet is 4.5-50N.

[0017] A power-off self-locking pinch valve system, comprising: Self-locking clamp valve upon power failure; The first transformer rectifier module has a first output terminal connected to one end of a first magnet via a first trigger switch, and the second output terminal of the first transformer rectifier module and the other end of the first magnet are both grounded. Second transformer and rectifier module; The relay has pin 1 connected to the first output terminal of the second transformer rectifier module, pin 2 connected to the first output terminal of the second transformer rectifier module and pin 1 respectively, pin 3 grounded, and pin 4 connected to one end of the second magnet. The capacitor has one end connected to pin 1 and pin 2 of the relay and the first output terminal of the second transformer rectifier module, respectively, while the other end of the capacitor, the second output terminal of the second transformer rectifier module, pin 3 of the relay, and the other end of the second magnet are all grounded.

[0018] As a further improvement of the present invention, the capacitors are configured to be two or more, and connected in parallel.

[0019] A dialysis device, characterized in that it includes a power-off self-locking clamp valve system.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a power-off self-locking clamp valve, which applies a self-locking torque to the telescopic component through a self-locking component. During treatment processes that last for several hours, it is not necessary to continuously energize the second magnet, thereby reducing energy consumption and avoiding safety hazards caused by overheating of the device.

[0021] 2. The present invention provides a power-off self-locking clamp valve system that can instantly clamp the pipeline, reducing the driving time compared to traditional motor drive, eliminating the delay in clamping the pipeline, and improving the efficiency of pipeline clamping. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ; Figure 3 The telescopic component and the self-locking component in this invention; Figure 4 This is a schematic diagram of the internal structure of the pinch valve body of the present invention; Figure 5 This is a top view of the internal structure of the pinch valve body of the present invention; Figure 6 This is a schematic diagram of the release state of the pinch valve of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the clamp valve lock and its status according to the present invention; Figure 8 This is a schematic diagram of the release state of the pinch valve of the present invention. Figure 2 ; Figure 9 This is a schematic diagram of the pinch valve system structure of the present invention; Figure 10This is a schematic diagram of the power-off lock and status of the clamp valve of the present invention.

[0023] Attached Figure

[0024] 100. Pinch valve body; 110. Pinch groove; 120. Upper housing; 130. Lower housing; 140. Semicircular groove; 200, Telescopic assembly; 210, Second magnet; 220, Second piston rod; 230, Push rod; 2310, Self-locking hole; 240, Second elastic element; 250, Pressure head; 260, Second baffle; 270, Insert plate; 300. Self-locking assembly; 310. First magnet; 320. First piston rod; 330. First elastic element; 340. First baffle; 400. First transformer and rectifier module; First trigger switch S1; 500, Second transformer rectifier module; Capacitor C1; Second trigger switch S2. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to 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] Figures 1 to 4 The diagram shown is a structural schematic of an embodiment of a power-off self-locking pinch valve of the present invention, the main body of which includes a pinch valve body 100, a telescopic component 200 and a self-locking component 300.

[0027] The clamp valve body 100 houses the telescopic assembly 200 and the self-locking assembly 300. The clamp valve body 100 has a hollow cavity along its length. The outer wall of the clamp valve body 100 has a clamping groove 110 for clamping the tubing. The clamping groove 110 is U-shaped and conforms to the contour of the tubing. The clamp valve body 100 is generally fixed inside the housing of a hemodialysis machine or CRRT device. The clamping groove 110 is partially located on the outside of the device housing and is used to clamp the tubing. The pinch valve body 100 includes a separable upper housing 120 and a lower housing 130, which can be fixed by screws. The upper housing 120 and the lower housing 130 cover each other to form a hollow cavity that accommodates the telescopic component 200 and the self-locking component 300. The telescopic component 200 is arranged along the length of the pinch valve body 100, and the self-locking component 300 is located on one side of the telescopic component 200 and is arranged perpendicular to the telescopic component 200. The pinch valve body 100 is generally T-shaped.

[0028] The telescopic assembly 200 is used to clamp the pipeline and is located in the hollow cavity of the clamp valve body 100. The telescopic assembly 200 has two states within the cavity: a first position (when the pipeline is clamped) and a second position (when the pipeline is released). Specifically, the telescopic assembly 200 includes a second magnet 210, a second piston rod 220, a push rod 230, and a second elastic element 240. The second magnet 210 has a through-hole along the length of the clamp valve body 100. The second piston rod 220 is movably located within the second piston hole. One end of the second piston rod 220 extends outward to the outside of the second magnet 210, and the other end extends outward and penetrates to the outside of the clamp valve body 100. One end of the push rod 230 is fixedly connected to the other end of the second piston rod 220. The outer wall of the push rod 230 opposite to the first piston rod 320 has a self-locking hole 2310 adapted to the first piston rod 320. The second elastic element 240 is sleeved on the second piston rod 220 and located near the end of the push rod 230. In this embodiment, the second elastic element 240 is a second spring, and the diameter of the second spring gradually increases from the end away from the second magnet 210 to the end closer to the second magnet 210. This prevents the spring from twisting during elastic deformation, and the compression spring can be compressed further. A second baffle 260 is fixedly provided on the outer peripheral wall of the second piston rod 220, limiting the second spring between the second baffle 260 and the second magnet 210 to prevent the spring from shifting. When the system is powered off, the second piston rod 220 drives the push rod 230 to move linearly, the second elastic element 240 is compressed, the first elastic element 330 is released, and the first piston rod 320 is locked into the self-locking hole 3210. The self-locking assembly 300 applies a self-locking torque to the push rod 230, at which time the push rod 230 clamps the pipeline, and the telescopic assembly 200 is in the first position. When the system is powered on, the first piston rod 320 retracts, the first elastic element 330 is compressed, the self-locking torque applied by the self-locking assembly 300 to the push rod 230 is released, the second piston rod 220 drives the push rod 230 to move linearly, the second elastic element 240 is reset, the first elastic element 330 is compressed, the self-locking hole 3210 is misaligned with the first piston rod 320, and the push rod 230 releases the pipeline, at which time the telescopic assembly 200 is in the second position. In summary, when the system is powered off, after the push rod 230 moves, the first piston rod 320 extends and inserts into the self-locking hole 2310; when the system is powered on, the first piston rod 320 retracts, and the push rod 230 moves to release the pipeline, thereby achieving the clamping and releasing of the pipeline.

[0029] Preferably, in this embodiment, to achieve a better clamping effect on the pipeline, a pressure head 250 is connected to the end of the push rod 230 away from the telescopic assembly 200, and the pressure head 250 is perpendicularly connected to the push rod 230. The pressure head 250 and the push rod 230 can be integrally formed into an L-shaped clamp. The pressure head 250 directly contacts the pipeline clamped in the clamping groove 110. The end of the pressure head 250 is wedge-shaped. When the telescopic assembly 200 is in the first position, the end of the pressure head 250 is located in the clamping groove 110. When the telescopic assembly 200 is in the second position, the end of the pressure head 250 is flush with the upper side of the clamping groove 110.

[0030] Preferably, in this embodiment, to prevent the push rod 230 from axially wobbling during linear motion, which would cause unstable locking, semi-circular grooves 140 adapted to the push rod 230 are respectively provided on the inner wall of the upper housing 120 and the lower housing 130 on the side of the push rod 230. The two semi-circular grooves 140 together form a limiting groove for the push rod 230, further ensuring the stability of the push rod 230's movement.

[0031] Preferably, in this embodiment, a plate 270 is provided at the end of the push rod 230 near the second piston rod 220, and a slot adapted to the plate 270 is provided at the end of the second piston rod 220 near the push rod 230. The width of the plate 270 is greater than the outer diameter of the second piston rod 220. In use, the plate 270 is inserted into the slot and fixed with screws, allowing for easy replacement if the push rod 230 wears or is damaged after a period of use.

[0032] To further monitor the clamping state of the expansion joint 200 on the pipeline, a Hall sensor is installed on the inner wall of the hollow cavity of the clamp valve body 100. The Hall sensor is located on one side of the free end of the push rod 230 or the second piston rod 220. The feedback signal transmitted by the Hall sensor can further determine the clamping and releasing state of the pipeline in real time on the host equipment to ensure safe use.

[0033] The self-locking assembly 300 is located within the hollow cavity of the housing 100 and on one side of the telescopic assembly. When the system is powered off, the telescopic assembly 200 is in a first position, and the self-locking assembly 300 applies a self-locking torque to the telescopic assembly 200, maintaining it in the first position, at which point the pipeline is clamped. When the system is powered on, the self-locking assembly 300 is released, allowing the telescopic assembly 200 to return to a second position, at which point the pipeline is opened. Specifically, the self-locking assembly 300 includes a first magnet 310, a first piston rod 320, and a first elastic element 330. The first magnet 310 has a through-hole extending along the width of the clamp valve body 100; the first piston rod 320 is movably located within the first piston hole, with one end extending outward to the outside of the first magnet 310 and close to the telescopic assembly 200, and the other end extending outward and penetrating to the outside of the clamp valve body 100; the first elastic element 330 is sleeved on the first piston rod 320 and close to the telescopic assembly 200. When the telescopic assembly 200 is in the first position (pipeline clamped), one end of the first piston rod 320 is engaged in the self-locking hole 2310; when the telescopic assembly 200 is in the second position (pipeline released), one end of the first piston rod 320 is located outside the push rod 230.

[0034] Preferably, in this embodiment, a first baffle 340 is fixedly disposed on the outer peripheral wall of the first piston rod 320 near the telescopic assembly 200, so that the first elastic element 330 is located between the first baffle 340 and the first magnet 310, preventing the spring from shifting. The first magnet 310 and the second magnet 210 are respectively fixedly disposed in the lower housing 130 by a support frame. The attraction force of the first magnet 310 is 1-20N, and the attraction force of the second magnet 210 is 4.5-50N. The first elastic element 330 is a first spring, and the diameter of the first spring gradually increases from the end away from the first magnet 310 to the end closer to the first magnet 310, so that the spring will not twist when it undergoes elastic deformation, and the compression spring can be compressed flatter.

[0035] During normal treatment by the main unit of the device, the clamping valve of this invention is normally open, and liquid can flow normally in the pipeline. When the main unit experiences an abnormal power failure, the second magnet 210 is activated, generating magnetic force that attracts the second piston rod 220, thereby causing the push rod 230 connected to the second piston rod 220 to move linearly. At this time, the first piston rod 320 is engaged in the self-locking hole 2310 provided on the outer wall of the push rod 230, causing the pressure head 250 to clamp the pipeline located in the clamping groove 110, preventing the liquid in the pipeline from continuing to flow. By applying a self-locking torque to the telescopic component 200 through the self-locking component 300, the flow of liquid is controlled. When the main unit of the device is powered on again, the first magnet 310 is activated, generating magnetic force. The first piston rod 320 moves away from the push rod 230, thereby separating one end of the first piston rod 320 from the self-locking hole 2310. The second piston rod 220 and the push rod 230 return to their original positions under the action of the second elastic element 240, thereby releasing the clamped tube from the pressure head 250. During the treatment process that lasts for several hours, it is not necessary to keep the second magnet 210 powered on, thereby reducing energy consumption and avoiding safety hazards caused by overheating of the device.

[0036] This invention also protects a power-off self-locking clamp valve system, comprising a power-off self-locking clamp valve, a first transformer rectifier module 400, a second transformer rectifier module 500, a relay, and a capacitor C1. The first output terminal of the first transformer rectifier module 400 is connected to one end 310 of a first magnet via a first trigger switch S1. The second output terminal of the first transformer rectifier module 400 and the other end of the first magnet 310 are both grounded. Pin 1 of the relay is connected to the first output terminal of the second transformer rectifier module 500, pin 2 is connected to both the first output terminal of the second transformer rectifier module 500 and pin 1, pin 3 is grounded, and pin 4 is connected to one end of the second magnet 210. One end of the capacitor C1 is connected to pins 1 and 2 of the relay and the first output terminal of the second transformer rectifier module 500. The other end of the capacitor C1, the second output terminal of the second transformer rectifier module 500, pin 3 of the relay, and the other end of the second magnet 210 are all grounded. Preferably, in this embodiment, there are two or more capacitors, specifically four in this embodiment. The four capacitors C1 are connected in parallel, and each capacitor C1 has a capacitance of 1000μF. In this embodiment, the opening and closing of relay pins 2 and 4 constitutes an electrical switch, controlled by the energizing state of relay pins 1 and 3, achieving the same effect as the first trigger switch S1.

[0037] Combination Figure 6-10 As shown, the locking, releasing, and power-off locking processes of a power-off self-locking pinch valve system according to this embodiment are as follows: Locking: AC power (mains power) is converted into voltage and current suitable for electromagnet after being rectified by transformer. The first trigger switch S1 is closed, the second magnet 210 is attracted, and the conduit is clamped. At the same time, the first piston rod 320 is inserted into the self-locking hole 2310 on the outer wall of the push rod 230 due to the action of the first elastic element 330. The clamping valve forms a self-lock. At this time, the locking is not affected when the first trigger switch S1 is released.

[0038] Release: When the second trigger switch S2 is closed, the first magnet 310 attracts the release push rod 230. At this time, the push rod 230 is released due to the action of the second elastic element 240, and the clamp valve is released.

[0039] Power-off locking: Assuming the machine has been used for a period of time and the AC power (mains power) is disconnected, at this time, the capacitor C1 has stored enough power. The relay forms a circuit after the power is cut off, which in turn makes the second magnet 210 and the capacitor C1 form a loop like a dotted line. The power of the capacitor C1 enables the relay to work and attract and drive the push rod 230 to clamp the conduit. At this time, the first magnet 310 is locked into the self-locking hole 2310 on the outer wall of the push rod 230 due to the action of the first elastic element 330. The clamping valve forms a self-lock, and the power-off locking is completed.

[0040] Traditional electric pinch valves use a motor to drive the valve core, squeezing or releasing the hose between the valve core and the stop bar to control the flow of fluid within the hose. The clamping and opening states of the hose are controlled by rotating the motor. However, motor-driven valves require a certain driving time, resulting in a delay in clamping the hose. This invention, however, can clamp the hose instantly. The relay used is a small, medium-power relay, model HF49FD, with an operating time ≤10ms. When pins 1 and 3 are energized, the coil generates a magnetic effect that attracts the valve switch at pins 2 and 4, thus completing the circuit. This operating time is less than ≤10ms, significantly reducing the driving time compared to traditional motor-driven valves, eliminating the delay in clamping the hose, and improving clamping efficiency.

[0041] This invention also protects a dialysis device, including a power-off self-locking clamp valve system. In use, the hemodialysis machine or CRRT device is powered on, and the tubing is clamped in the clamping slot 110, charging capacitor C1. During treatment lasting several hours, the power-off self-locking clamp valve system remains open, allowing fluid to flow through the tubing. When the system detects an abnormality, such as a power outage, the charge on capacitor C1 activates a relay, which in turn pulls the push rod 230 to clamp the catheter. At this time, the self-locking component 300 locks the telescopic component 200, closing the tubing. Thus, when the system detects an abnormality, it safely and reliably clamps the tubing, controlling the flow of blood within it.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-locking pinch valve upon power failure, characterized in that, include: The clamp valve body (100) has a hollow cavity along its length, and the outer wall of the clamp valve body (100) is provided with a clamping groove (110) for clamping the pipeline. The telescopic assembly (200) is located in the hollow cavity of the clamp valve body (100), and the telescopic assembly (200) has two states in the cavity: a first position and a second position. The self-locking assembly (300) is located in the hollow cavity of the clamp valve body (100), and the self-locking assembly (300) is located on one side of the telescopic assembly (200). The telescopic assembly (200) includes a second magnet (210), a second piston rod (220), a push rod (230), and a second elastic element (240). The second magnet (210) has a through second piston hole along the length of the clamp valve body (100). The second piston rod (220) is movably located in the second piston hole. One end of the second piston rod (220) extends outward to the outside of the second magnet (210), and the other end extends outward and penetrates to the outside of the clamp valve body (100). One end of the push rod (230) is fixedly connected to the other end of the second piston rod (220). The outer wall of the push rod (230) is provided with a self-locking hole (2310) for cooperating with the self-locking assembly (300). The second elastic element (240) is sleeved on the second piston rod (220) and is located on the side close to the push rod (230). When the system is powered off, the second piston rod (220) drives the push rod (230) to move linearly, the second elastic element (240) is compressed, the self-locking assembly (300) applies a self-locking torque to the telescopic assembly (200) and keeps the telescopic assembly (200) in the first position, at which time the pipeline is clamped; when the system is powered on, the self-locking torque applied by the self-locking assembly (300) to the push rod (230) is released, the second piston rod (220) drives the push rod (230) to move linearly, the second elastic element (240) is reset, the telescopic assembly (200) returns to the second position, at which time the pipeline is opened.

2. The self-locking pinch valve according to claim 1, characterized in that, The self-locking component (300) includes: The first magnet (310) has a through first piston hole along the width direction of the clamp valve body (100); The first piston rod (320) is movably located in the first piston hole. One end of the first piston rod (320) extends outward to the outside of the first magnet (310) and close to the telescopic assembly (200). The other end of the first piston rod (320) extends outward and penetrates to the outside of the clamp valve body (100). The first elastic element (330) is sleeved on the first piston rod (320), and the first elastic element (330) is disposed on the side close to the telescopic assembly (200); When the system is powered off, the first elastic element (330) is released, the first piston rod (320) is locked into the self-locking hole (2310), the self-locking assembly (300) applies a self-locking torque to the push rod (230), and the push rod (230) clamps the pipeline. At this time, the telescopic assembly (200) is in the first position. When the system is powered on, the first piston rod (320) retracts, the first elastic element (330) is compressed, the self-locking hole (2310) is misaligned with the first piston rod (320), and the push rod (230) releases the pipeline. At this time, the telescopic assembly (200) is in the second position.

3. The self-locking pinch valve according to claim 2, characterized in that: A first baffle (340) is fixedly provided on the outer peripheral wall of the first piston rod (320) near the telescopic assembly (200), and the first elastic element (330) is located between the first baffle (340) and the first magnet (310).

4. The self-locking pinch valve according to claim 3, characterized in that: The first elastic element (330) is a first spring, and the diameter of the first spring gradually increases from the end away from the first magnet (310) to the end closer to the first magnet (310).

5. The self-locking pinch valve according to claim 1, characterized in that: The push rod (230) is connected to a pressure head (250) at the end away from the telescopic assembly (200), and the pressure head (250) is perpendicularly connected to the push rod (230).

6. A self-locking pinch valve upon power failure according to claim 5, characterized in that: The end of the pressure head (250) is wedge-shaped; when the telescopic assembly (200) is in the first position, the end of the pressure head (250) is located in the clamping groove (110), and when the telescopic assembly (200) is in the second position, the end of the pressure head (250) is flush with the upper side of the clamping groove (110).

7. The self-locking pinch valve according to claim 1, characterized in that: A Hall sensor is installed in the hollow cavity of the clamp valve body (100), and the Hall sensor is located on one side of the free end of the push rod (230) or the second piston rod (220).

8. A self-locking pinch valve upon power failure according to claim 1, characterized in that: A second baffle (260) is fixedly provided on the outer peripheral wall of the second piston rod (220) near the push rod (230), and the second elastic element (240) is located between the second baffle (260) and the second magnet (210).

9. A self-locking pinch valve upon power failure according to claim 1, characterized in that: The second elastic element (240) is a second spring, and the diameter of the second spring gradually increases from the end away from the second magnet (210) to the end closer to the second magnet (210).

10. A self-locking pinch valve upon power failure according to claim 1, characterized in that: The push rod (230) is provided with a plate (270) at one end near the second piston rod (220), and the second piston rod (220) is provided with a slot adapted to the plate (270) at one end near the push rod (230). The width of the plate (270) is greater than the outer diameter of the second piston rod (220).

11. A self-locking pinch valve upon power failure according to claim 2, characterized in that: The clamp valve body (100) includes a separable upper housing (120) and a lower housing (130). The upper housing (120) and the lower housing (130) are closed to form a hollow cavity that accommodates the telescopic component (200) and the self-locking component (300). The first magnet (310) and the second magnet (210) are respectively fixedly installed in the lower housing (130) by a support frame.

12. A self-locking pinch valve upon power failure according to claim 11, characterized in that: The upper housing (120) and the lower housing (130) are respectively provided with semi-circular grooves (140) on the inner wall of one side of the push rod (230) to match the push rod (230). The two semi-circular grooves (140) are arranged together to form a limiting groove for restricting the push rod (230).

13. A self-locking pinch valve upon power failure according to claim 2, characterized in that: The attraction force of the first magnet (310) is 1-20N, and the attraction force of the second magnet (210) is 4.5-50N.

14. A power-off self-locking pinch valve system, comprising: The self-locking clamp valve as described in any one of claims 1-13; The first transformer rectifier module (400) has its first output terminal connected to one end of the first magnet (310) via a first trigger switch (S1), and the second output terminal of the first transformer rectifier module (400) and the other end of the first magnet (310) are both grounded. Second transformer rectifier module (500); The relay has pin 1 connected to the first output terminal of the second transformer rectifier module (500), pin 2 connected to the first output terminal of the second transformer rectifier module (500) and pin 1 respectively, pin 3 grounded, and pin 4 connected to one end of the second magnet (210). A capacitor (C1) is connected at one end to pin 1 and pin 2 of the relay and the first output terminal of the second transformer rectifier module (500), and the other end of the capacitor (C1), the second output terminal of the second transformer rectifier module (500), pin 3 of the relay and the other end of the second magnet (210) are all grounded.

15. A power-off self-locking pinch valve system according to claim 14, characterized in that: The capacitor (C1) is set to two or more, and they are connected in parallel.

16. A dialysis device, characterized in that, Includes the power-off self-locking pinch valve system as described in any one of claims 14-15.

Images