CN117662792A

CN117662792A - Self-locking pinch valve capable of being powered off, system and dialysis equipment thereof

Info

Publication number: CN117662792A
Application number: CN202310585488.8A
Authority: CN
Inventors: 管翔; 余郑军; 刘世彬; 王江涛
Original assignee: Nanjing Hanke Mingde Medical Technology Co ltd
Current assignee: Nanjing Hanke Mingde Medical Technology Co ltd
Priority date: 2023-05-23
Filing date: 2023-05-23
Publication date: 2024-03-08

Abstract

The invention discloses a self-locking pinch valve capable of being powered off and a system, comprising a pinch valve body and a telescopic component core self-locking component arranged in the pinch valve body, wherein a clamping groove for clamping a pipeline is formed in the outer wall of the pinch valve body; when the system is powered on, the self-locking assembly is released, allowing the telescoping assembly to resume the second position, at which time the tubing is released. The self-locking component is used for applying self-locking moment to the telescopic component, and the second magnet are not required to be electrified all the time in the treatment process for a plurality of hours, so that energy consumption is reduced, potential safety hazards caused by overheat of devices are avoided, and in addition, the system can clamp a pipeline instantly, so that the efficiency of clamping the pipeline is improved.

Description

Self-locking pinch valve capable of being powered off, system and dialysis equipment thereof

Technical Field

The invention relates to the field of medical equipment, in particular to a self-locking pinch valve capable of being powered off, a system and dialysis equipment thereof.

Background

The electromagnetic pinch valve (pinch valve for short) uses electromagnetic property, uses piston to make piston movement in valve body by electromagnetic force and spring, uses tube clamp to clamp hose so as to attain the goal of closing and opening hose. At present, the electromagnetic pinch valve is widely applied to medical equipment, particularly blood treatment equipment such as a hemodialysis machine or CRRT equipment, and in order to ensure treatment safety, when the system detects abnormal conditions (such as blood leakage of a pipeline, generation of bubbles in the pipeline or abnormal power failure of a host machine), the pipeline needs to be clamped in a safe and reliable mode to control the flowing state of blood in the pipeline. When the electromagnetic pinch valve is in an open state, liquid can circulate in the pipeline, when the electromagnetic pinch valve is closed, the pipeline is clamped, and in a closed state, the liquid in the pipeline cannot continue to circulate, so that the control on the liquid circulation is realized. However, such electromagnetic pinch valves require the electromagnetic pinch valves to be always energized in the course of treatment for up to several hours or even tens of hours, and have large power consumption, large heat generation after long-term use, and certain potential safety hazards.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide a self-locking pinch valve capable of being powered off, which applies self-locking moment to a telescopic component through a self-locking component and does not need to always electrify the pinch valve in the treatment process, so that the energy consumption is reduced, and potential safety hazards caused by overheat of devices are avoided.

In order to solve the technical problems, the invention adopts the following technical scheme: a self-locking pinch valve capable of being powered off, comprising:

the pipe clamping valve comprises a pipe clamping valve body, a pipe clamping device and a pipe clamping device, wherein a hollow cavity is formed in the pipe clamping valve body along the length direction of the pipe clamping valve body, and a clamping groove for clamping a pipeline is formed in the outer wall of the pipe clamping valve body;

the telescopic assembly is positioned in the hollow cavity of the pinch valve body and is in a first position and a second position in the cavity;

the self-locking assembly is positioned in the hollow cavity of the shell, the self-locking assembly is positioned on one side of the telescopic assembly, when the system is powered off, the telescopic assembly is positioned at a first position, the self-locking assembly applies self-locking moment to the telescopic assembly, the telescopic assembly is maintained at the first position, and at the moment, the pipeline is clamped; when the system is powered on, the self-locking assembly is released, allowing the telescoping assembly to resume the second position, at which time the tubing is released.

As a further improvement of the present invention, the self-locking assembly includes:

a first magnet provided with a first piston hole penetrating along the width direction of the pinch valve body;

the first piston rod is movably positioned in the first piston hole, one end of the first piston rod extends outwards to the outer side of the first magnet and is close to one side of the telescopic assembly, and the other end of the first piston rod extends outwards and penetrates through the outer side of the pinch valve body;

the first elastic piece is sleeved on the first piston rod and arranged on one side close to the telescopic component.

As a further improvement of the invention, a first baffle is fixedly arranged on the peripheral wall of the first piston rod, which is close to one end of the telescopic assembly, and the first elastic piece is positioned between the first baffle and the first magnet.

As a further improvement of the invention, the first elastic member is a first spring, and the diameter of the first spring gradually increases from one end far from the first magnet to one end close to the first magnet.

As a further improvement of the present invention, the telescopic assembly includes:

the second magnet is provided with a second piston hole penetrating through the second magnet along the length direction of the pinch valve body;

the second piston rod is movably positioned in the second piston hole, one end of the second piston rod extends outwards to the outer side of the second magnet, and the other end of the second piston rod extends outwards and penetrates to the outer side of the pinch valve body;

one end of the push rod is fixedly connected with the other end of the second piston rod, and a self-locking hole matched with the first piston rod is formed in the outer wall of the push rod opposite to one end of the first piston rod;

the second elastic piece is sleeved on the second piston rod and is arranged on one side close to the push rod;

when the system is powered off, the second piston rod drives the push rod to do linear motion, the second elastic piece is compressed, the first elastic piece is released, the first piston rod is clamped into the self-locking hole, the self-locking component applies self-locking moment to the push rod, the push rod clamps the pipeline at the moment, and the telescopic component is at the first position;

when the system is electrified, the first piston rod is retracted, the first elastic element is compressed, the self-locking moment applied by the self-locking assembly to the push rod is released, the second piston rod drives the push rod to do linear motion, the second elastic element is reset, the first elastic element is compressed, the self-locking hole is staggered with the first piston rod, the push rod releases the pipeline, and the telescopic assembly is located at the second position.

As a further improvement of the invention, one end of the push rod far away from the telescopic component is connected with a pressure head, and the pressure head is vertically connected with the push rod.

As a further improvement of the invention, the tail end of the pressure head is wedge-shaped, when the telescopic component is in the first position, the tail end of the pressure head is positioned in the clamping groove, and when the telescopic component is in the second position, the tail end of the pressure head is flush with the upper side surface of the clamping groove.

As a further improvement of the invention, a hall sensor is arranged in the hollow cavity of the pinch valve body, and the hall sensor is arranged at one side of the free end of the push rod or the second piston rod.

As a further improvement of the invention, a second baffle is fixedly arranged on the peripheral wall of one end, close to the push rod, of the second piston rod, and the second elastic piece is positioned between the second baffle and the second magnet.

As a further improvement of the invention, the second elastic member is a second spring, and the diameter of the second spring gradually increases from one end far from the second magnet to one end close to the second magnet.

As a further improvement of the invention, a plugboard is arranged at one end of the push rod, which is close to the second piston rod, a slot which is matched with the plugboard is arranged at one end of the second piston rod, which is close to the push rod, and the width of the plugboard is larger than the outer diameter of the second piston rod.

As a further improvement of the invention, the pinch valve body comprises an upper shell and a lower shell which are separable, the upper shell and the lower shell are covered to form a hollow cavity for accommodating the telescopic component and the self-locking component, and the first magnet and the second magnet are fixedly arranged in the lower shell through supporting frames respectively.

As a further improvement of the invention, the inner walls of the upper shell and the lower shell, which are positioned on one side of the push rod, are respectively provided with a semicircular groove matched with the push rod, and the two semicircular grooves are vertically surrounded to form a limiting groove for limiting the push rod.

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

A self-locking pinch valve system capable of being powered off, comprising:

self-locking pinch valve capable of being powered off;

the first output end of the first transformation rectifying module is connected with the first magnet through a first trigger switch, and the second output end of the first transformation rectifying module and the first magnet are grounded;

the second transformation rectifying module;

the pin 1 of the relay is connected with the first output end of the second transformation rectifying module, the pin 2 is respectively connected with the first output end of the second transformation rectifying module and the pin 1, the pin 3 is grounded, and the pin 4 is connected with the second magnet;

and one end of the capacitor is respectively connected with the pin 1 and the pin 2 of the relay and the first output end of the second transformation rectifying module, and the other end of the capacitor, the second output end of the second transformation rectifying module, the pin 3 of the relay and the second magnet are all grounded.

As a further improvement of the present invention, the capacitors are arranged in more than 2 and are connected in parallel with each other.

A dialysis apparatus comprising a self-locking pinch valve system that is electrically deactivatable.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the power-off self-locking pinch valve, self-locking moment is applied to the telescopic component through the self-locking component, and the second magnet do not need to be electrified all the time in the treatment process for several hours, so that energy consumption is reduced, and potential safety hazards caused by overheat of devices are avoided.

2. The power-off self-locking type pinch valve system can clamp the pipeline instantaneously, reduces the driving time compared with the traditional motor driving, has no delay on the clamping of the pipeline, and improves the efficiency of the clamping of the pipeline.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the whole structure of the present invention;

FIG. 3 illustrates a telescoping assembly and a self-locking assembly of the present invention;

FIG. 4 is a schematic view of the internal structure of the pinch valve body of the present invention;

FIG. 5 is a top view of the internal structure of the pinch valve body of the present invention;

FIG. 6 is a schematic diagram of a pinch valve of the present invention in a released state;

FIG. 7 is a schematic view of a pinch valve lock and state of the present invention;

FIG. 8 is a second schematic view of a pinch valve release state of the present invention;

FIG. 9 is a schematic diagram of a pinch valve system of the present invention;

FIG. 10 is a schematic view of the pinch valve power-off lock and state of the present invention.

Drawings

100. A pinch valve body; 110. a clamping groove; 120. an upper housing; 130. a lower housing; 140. a semicircular groove;

200. a telescoping assembly; 210. a second magnet; 220. a second piston rod; 230. a push rod; 2310. self-locking holes; 240. a second elastic member; 250. a pressure head; 260. a second baffle; 270. inserting plate;

300. a self-locking assembly; 310. a first magnet; 320. a first piston rod; 330. a first elastic member; 340. a first baffle;

400. a first variable-voltage rectifying module; a first trigger switch S1;

500. the second transformation rectifying module; a capacitor C1; and a second trigger switch S2.

Description of the embodiments

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 1 to 4 are schematic structural views showing an embodiment of a self-locking pinch valve capable of being powered off according to the present invention, wherein a main body portion of the self-locking pinch valve comprises a pinch valve body 100, a telescopic assembly 200 and a self-locking assembly 300.

The telescopic component 200 and the self-locking component 300 are placed by a user of the pinch valve body 100, the pinch valve body 100 is provided with a hollow cavity along the length direction of the pinch valve body, the outer wall of the pinch valve body 100 is provided with a clamping groove 110 for clamping a pipeline, and the clamping groove 110 is in a U-shaped line and is matched with the contour of the pipeline. The pinch valve body 100 is typically secured within a housing of a hemodialysis machine or CRRT device with a clamping groove 110 partially located on the outside of the device housing for clamping the tubing. The pinch valve body 100 comprises an upper casing 120 and a lower casing 130 which are separable, the upper casing 120 and the lower casing 130 can be fixed by screws, the upper casing 120 and the lower casing 130 are covered to form a hollow cavity for accommodating the telescopic assembly 200 and the self-locking assembly 300, wherein the telescopic assembly 200 is arranged along the length direction of the pinch valve body 100, the self-locking assembly 300 is positioned on one side of the telescopic assembly 200 and is arranged relative to the telescopic assembly 200 in the vertical direction, and the whole pinch valve body 100 is approximately T-shaped.

The telescopic assembly 200 is used for clamping the pipeline and is located in the hollow cavity of the pinch valve body 100, and the telescopic assembly 200 has a first position (when the pipeline is clamped) and a second position (when the pipeline is released) in the cavity. Specifically, the telescopic assembly 200 includes a second magnet 210, a second piston rod 220, a push rod 230, and a second elastic member 240. The second magnet 210 is provided with a second piston hole penetrating along the length direction of the pinch 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 outwards to the outer side of the second magnet 210, the other end of the second piston rod 220 extends outwards and penetrates to the outer side of the pinch valve body 100, one end of the push rod 230 is fixedly connected with the other end of the second piston rod 220, and a self-locking hole 2310 matched with the first piston rod 320 is formed in the outer wall of one end of the push rod 230 opposite to the first piston rod 320. The second elastic member 240 is sleeved on the second piston rod 220 and is close to one end of the push rod 230, in this embodiment, the second elastic member 240 is a second spring, and the diameter of the second spring gradually increases from one end far away from the second magnet 210 to one end close to the second magnet 210, so that the spring will not twist when elastically deformed, and the compression spring can be compressed more flatly. A second baffle 260 is fixedly arranged on the outer peripheral wall of the second piston rod 220, so that the second spring is limited between the second baffle 260 and the second magnet 210, and the spring is prevented from moving. When the system is powered off, the second piston rod 220 drives the push rod 230 to do linear motion, the second elastic member 240 is compressed, the first elastic member 330 is released, the first piston rod 320 is clamped into the self-locking hole 3210, the self-locking assembly 300 applies self-locking moment to the push rod 230, the push rod 230 clamps the pipeline at this time, and the telescopic assembly 200 is at the first position; when the system is powered on, the first piston rod 320 is retracted, the first elastic member 330 is compressed, the self-locking moment applied to the push rod 230 by the self-locking assembly 300 is released, the second piston rod 220 drives the push rod 230 to do linear motion, the second elastic member 240 is reset, the first elastic member 330 is compressed, the self-locking hole 3210 is staggered with the first piston rod 320, the push rod 230 releases the pipeline, and the telescopic assembly 200 is at the second position. In summary, when the system is powered off, after the push rod 230 moves, the first piston rod 320 extends out and is inserted into the self-locking hole 2310; when the system is powered on, the first piston rod 320 is retracted, and the push rod 230 moves to open the pipeline, thereby achieving clamping and opening of the pipeline.

Preferably, in this embodiment, in order to achieve a better clamping effect of the pipeline, a ram 250 is connected to an end of the ram 230 away from the telescopic assembly 200, and the ram 250 is vertically connected to the ram 230. The pressing head 250 and the pushing rod 230 may be integrally formed into an L-shaped clamp, the pressing head 250 directly contacts with the pipeline clamped in the clamping groove 110, the end of the pressing head 250 is wedge-shaped, when the telescopic assembly 200 is in the first position, the end of the pressing head 250 is positioned in the clamping groove 110, and when the telescopic assembly 200 is in the second position, the end of the pressing head 250 is flush with the upper side surface of the clamping groove 110.

Preferably, in this embodiment, in order to avoid axial shake of the push rod 230 during linear motion, so that locking is unstable, semicircular grooves 140 adapted to the push rod 230 are respectively formed in the inner walls of the upper and lower shells 120 and 130 on one side of the push rod 230, and the two semicircular grooves 140 are vertically surrounded to form a limiting groove of the push rod 230, so that stability of motion of the push rod 230 is further ensured.

Preferably, in this embodiment, a plug board 270 is disposed at an end of the push rod 230 near the second piston rod 220, a slot adapted to the plug board 270 is disposed at an end of the second piston rod 220 near the push rod 230, and a width of the plug board 270 is larger than an outer diameter of the second piston rod 220. In use, the insert plate 270 is inserted into the slot and fixed by screws, and the push rod 230 is worn or damaged after a period of use, so that the insert plate can be replaced conveniently.

In order to further monitor the clamping state of the telescopic assembly 200 on the pipeline, a hall sensor is arranged on the inner wall of the hollow cavity of the pinch valve body 100, the hall sensor is arranged on one side of the free end of the push rod 230 or the second piston rod 220, and the clamping state and the releasing state of the pipeline can be further judged on the host equipment in real time through feedback signals transmitted by the hall sensor, so that the use safety is ensured.

The self-locking assembly 300 is located in the hollow cavity of the housing 100 and located at one side of the telescopic assembly, when the system is powered off, the telescopic assembly 200 is located at the first position, the self-locking assembly 300 applies self-locking moment to the telescopic assembly 200, and maintains the telescopic assembly 200 at the first position, and at this time, the pipeline is clamped; when the system is powered up, the self-locking assembly 300 is released, allowing the telescoping assembly 200 to return to the second position, at which time the tubing is released. Specifically, the self-locking assembly 300 includes a first magnet 310, a first piston rod 320, and a first elastic member 330. The first magnet 310 is provided with a first piston hole penetrating along the width direction of the pinch 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 outwards to the outer side of the first magnet 310 and is close to one side of the telescopic assembly 200, and the other end of the first piston rod 320 extends outwards and penetrates to the outer side of the pinch valve body 100; the first elastic member 330 is sleeved on the first piston rod 320 and is close to one side of the telescopic assembly 200. When the telescopic assembly 200 is in the first position (pipe clamping), one end of the first piston rod 320 is clamped into the self-locking hole 2310, and when the telescopic assembly 200 is in the second position (pipe releasing), one end of the first piston rod 320 is located outside the push rod 230.

Preferably, in the present embodiment, a first baffle 340 is fixedly disposed on an outer peripheral wall of the first piston rod 320 near one end of the telescopic assembly 200, so that the first elastic member 330 is located between the first baffle 340 and the first magnet 310, and the spring is prevented from moving. The first magnet 310 and the second magnet 210 are fixedly arranged in the lower housing 130 through a supporting frame respectively, 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 member 330 is a first spring, and the diameter of the first spring gradually increases from one end far from the first magnet 310 to one end close to the first magnet 310, so that the spring cannot be distorted when being elastically deformed, and the pressure spring can be pressed more flatly.

When the equipment host is in a normal treatment process, the pinch valve is in a normally open state, and liquid can normally flow in the pipeline. When the host computer is abnormally powered off, the second magnet 210 is started to generate magnetic force to generate adsorption force to the second piston rod 220, so that the push rod 230 connected with the second piston rod 220 is driven to perform linear motion, at the moment, the first piston rod 320 is clamped into the self-locking hole 2310 formed in the outer wall of the push rod 230, so that the pressure head 250 clamps a pipeline positioned in the clamping groove 110, liquid in the pipeline cannot continue to circulate, self-locking torque is applied to the telescopic assembly 200 through the self-locking assembly 300, and control over liquid circulation is achieved. When the device host is powered on again, the first magnet 310 is started to generate magnetic force, the first piston rod 320 moves in a direction away from the push rod 230, so that one end of the first piston rod 320 is separated from the self-locking hole 2310, the second piston rod 220 and the push rod 230 return under the action of the second elastic piece 240, so that the pressure head 250 is released from the clamped pipeline, and the second magnet 210 do not need to be always powered on in a treatment process for several hours, so that energy consumption is reduced, and potential safety hazards caused by overheat devices are avoided.

The invention also provides a power-off self-locking pinch valve system, which comprises a power-off self-locking pinch valve, a first voltage transformation rectifying module 400, a second voltage transformation rectifying module 500, a relay and a capacitor C1. The first output end of the first transformer rectifier module 400 is connected with the first magnet 310 through the first trigger switch S1, and the second output end of the first transformer rectifier module 400 and the first magnet 310 are grounded. Pin 1 of the relay is connected with the first output end of the second transformation rectifying module 500, pin 2 is connected with the first output end of the second transformation rectifying module 500 and pin 1 respectively, pin 3 is grounded, pin 4 is connected with the second magnet 210, one end of the capacitor C1 is connected with the pin 1 of the relay, pin 2 and the first output end of the second transformation rectifying module 500 respectively, and the other end of the capacitor C1, the second output end of the second transformation rectifying module 500, pin 3 of the relay and the second magnet 210 are grounded. Preferably, in the present embodiment, the number of capacitors is set to 2 or more, in the present embodiment, 4 capacitors C1 are set to be parallel to each other, and the capacity of each capacitor C1 is 1000 μf. In the present embodiment, the opening and closing of the pins 2 and 4 of the relay belong to the electric switch, and are controlled by the energizing condition of the pins 1 and 3 of the relay, and the effect actually achieved is identical to that of the first trigger switch S1.

Referring to fig. 6-10, a locking, releasing and power-off locking process of the power-off self-locking pinch valve system according to the present embodiment is as follows:

locking: the alternating current (commercial power) is converted into voltage and current suitable for the electromagnet after transformation and rectification, the first trigger switch S1 is closed, the second magnet 210 is attracted, so that the catheter is clamped, meanwhile, the first piston rod 320 is clamped into the self-locking hole 2310 on the outer wall of the push rod 230 under the action of the first elastic piece 330, the pinch valve forms self-locking, and at the moment, the locking is not influenced after the first trigger switch S1 is released.

Releasing: the second trigger switch S2 is closed, and the first magnet 310 attracts the release push rod 230, and at this time, the pinch valve is released due to the push rod 230 being released by the second elastic member 240.

And (5) power-off locking: assuming that the machine is disconnected by using a period of alternating current (mains supply), enough electric quantity is stored in the capacitor C1, the relay forms a passage after the relay is powered off, so that the second magnet 210 and the capacitor C1 form a loop like a broken line, the electric energy of the capacitor C1 is absorbed and drives the push rod 230 to clamp the guide tube after the relay works, and the first magnet 310 is clamped into the self-locking hole 2310 on the outer wall of the push rod 230 due to the action of the first elastic piece 330 at the moment, the pinch valve forms self-locking, and the power-off locking is completed.

The traditional electric pinch valve adopts a motor to drive a valve core to move, and a hose between the valve core and a stop bar is extruded or loosened to control the on-off of fluid in the hose, and the clamping state and the opening state of the pinch pipe to a pipeline are controlled by controlling the forward and reverse rotation of the motor. However, the motor driving needs a certain driving time, so that a certain delay is caused to clamp the pipeline, the invention can instantly clamp the pipeline, the relay is a small-sized medium-power relay, the model is HF49FD, the action time is less than or equal to 10ms, the relay generates a magnetic effect when the coil is electrified under the condition that the pin 1 and the pin 3 are electrified to attract the valve switches of the pin 2 and the pin 4, the loop is conducted, the action time is less than or equal to 10ms, compared with the traditional motor driving, the driving time is reduced, the pipeline clamping is not delayed, and the efficiency of the pipeline clamping is improved.

The invention also provides a dialysis apparatus comprising a self-locking pinch valve system that can be powered off. When the hemodialysis machine or the CRRT equipment is used, the hemodialysis machine or the CRRT equipment is powered on, the pipeline is clamped in the clamping groove 110, the capacitor C1 is charged, the self-locking type pinch valve system can be powered off in a normally open state in the treatment process of several hours, and liquid can flow in the pipeline. When the system detects an abnormal condition, such as power failure of the host, the electric energy of the capacitor C1 enables the relay to work and then to suck and drive the push rod 230 to clamp the conduit, and at the moment, the self-locking assembly 300 forms self-locking on the telescopic assembly 200, so that the pipeline is clamped. Therefore, when the system detects that an abnormal condition exists, the pipeline is clamped in a safe and reliable mode, and the flowing state of blood in the pipeline is controlled.

Although embodiments of the present 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 therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A self-locking pinch valve capable of being powered off, comprising:

the pipe clamping valve comprises a pipe clamping valve body (100), wherein a hollow cavity is formed in the pipe clamping valve body (100) along the length direction of the pipe clamping valve body, and a clamping groove (110) used for clamping a pipeline is formed in the outer wall of the pipe clamping valve body (100);

a telescoping assembly (200), the telescoping assembly (200) being located within the hollow cavity of the pinch valve body (100), the telescoping assembly (200) having two states, a first position and a second position, within the cavity;

the self-locking assembly (300) is positioned in the hollow cavity of the pinch valve body (100), and the self-locking assembly (300) is positioned on one side of the telescopic assembly (200);

when the system is powered off, the telescopic assembly (200) is located at a first position, the self-locking assembly (300) applies self-locking moment to the telescopic assembly (200) and enables the telescopic assembly (200) to be maintained at the first position, and at the moment, the pipeline is clamped; when the system is powered on, the self-locking assembly (300) is released and the telescoping assembly (200) returns to the second position, at which time the tubing is released.

2. The self-lockable pinch valve according to claim 1, characterized in that the self-locking assembly (300) comprises:

a first magnet (310), wherein the first magnet (310) is provided with a first piston hole penetrating along the width direction of the pinch valve body (100);

the first piston rod (320) is movably arranged in the first piston hole, one end of the first piston rod (320) extends outwards to the outer side of the first magnet (310) and is close to the telescopic assembly (200), and the other end of the first piston rod (320) extends outwards and penetrates to the outer side of the pinch valve body (100);

the first elastic piece (330), first elastic piece (330) cover is established on first piston rod (320), first elastic piece (330) set up in the one side that is close to flexible subassembly (200).

3. A self-locking pinch valve capable of being powered off as claimed in claim 2, wherein: a first baffle (340) is fixedly arranged on the outer peripheral wall, close to one end of the telescopic assembly (200), of the first piston rod (320), and the first elastic piece (330) is located between the first baffle (340) and the first magnet (310).

4. A self-locking pinch valve capable of being powered off as claimed in claim 3, wherein: the first elastic piece (330) is a first spring, and the diameter of the first spring gradually increases from one end far away from the first magnet (310) to one end close to the first magnet (310).

5. The self-locking pinch valve of claim 2, wherein the telescoping assembly (200) comprises:

a second magnet (210), wherein a second piston hole penetrating through the second magnet (210) is arranged along the length direction of the pinch valve body (100);

the second piston rod (220) is movably arranged in the second piston hole, one end of the second piston rod (220) extends outwards to the outer side of the second magnet (210), and the other end of the second piston rod (220) extends outwards and penetrates through the outer side of the pinch valve body (100);

the pushing rod (230), one end of the pushing rod (230) is fixedly connected with the other end of the second piston rod (220), and a self-locking hole (2310) matched with the first piston rod (320) is formed in the outer wall of one end of the pushing rod (230) opposite to the first piston rod (320);

the second elastic piece (240) is sleeved on the second piston rod (220), and the second elastic piece (240) is arranged on one side close to the push rod (230);

when the system is powered off, the second piston rod (220) drives the push rod (230) to do linear motion, the second elastic piece (240) is compressed, the first elastic piece (330) is released, the first piston rod (320) is clamped into the self-locking hole (3210), the self-locking component (300) applies self-locking moment to the push rod (230), at the moment, the push rod (230) clamps the pipeline, and at the moment, the telescopic component (200) is positioned at the first position;

when the system is electrified, the first piston rod (320) is retracted, the first elastic piece (330) is compressed, the self-locking moment 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 do linear motion, the second elastic piece (240) is reset, the first elastic piece (330) is compressed, the self-locking hole (3210) is staggered with the first piston rod (320), the push rod (230) releases a pipeline, and the telescopic assembly (200) is at a second position.

6. The self-locking pinch valve of claim 5, wherein: one end of the push rod (230) far away from the telescopic component (200) is connected with a pressure head (250), and the pressure head (250) is vertically connected with the push rod (230).

7. The self-locking pinch valve of claim 6, wherein: the tail end of the pressure head (250) is wedge-shaped, when the telescopic component (200) is located at the first position, the tail end of the pressure head (250) is located in the clamping groove (110), and when the telescopic component (200) is located at the second position, the tail end of the pressure head (250) is flush with the upper side face of the clamping groove (110).

8. The self-locking pinch valve of claim 5, wherein: a Hall sensor is arranged in the hollow cavity of the pinch valve body (100), and the Hall sensor is arranged on one side of the free end of the push rod (230) or the second piston rod (220).

9. The self-locking pinch valve of claim 5, wherein: a second baffle (260) is fixedly arranged on the outer peripheral wall of one end, close to the push rod (230), of the second piston rod (220), and the second elastic piece (240) is positioned between the second baffle (260) and the second magnet (210).

10. The self-locking pinch valve of claim 9, wherein: the second elastic piece (240) is a second spring, and the diameter of the second spring gradually increases from one end far away from the second magnet (210) to one end close to the second magnet (210).

11. The self-locking pinch valve of claim 5, wherein: the push rod (230) is close to one end of second piston rod (220) and is provided with picture peg (270), one end that second piston rod (220) is close to push rod (230) is provided with the slot with picture peg (270) looks adaptation, the width of picture peg (270) is greater than the external diameter of second piston rod (220).

12. The self-locking pinch valve of claim 5, wherein: the pinch valve body (100) comprises an upper shell (120) and a lower shell (130) which are separable, the upper shell (120) and the lower shell (130) are covered to form a hollow cavity for accommodating the telescopic assembly (200) and the self-locking assembly (300), and the first magnet (310) and the second magnet (210) are fixedly arranged in the lower shell (130) through supporting frames respectively.

13. The self-locking pinch valve of claim 12, wherein: the upper shell (120) and the lower shell (130) are respectively provided with a semicircular groove (140) matched with the push rod (230) on one side inner wall of the push rod (230), and the two semicircular grooves (140) are vertically surrounded to form a limiting groove for limiting the push rod (230).

14. The self-locking pinch valve of claim 5, wherein: the attraction force of the first magnet (310) is 1-20N, and the attraction force of the second magnet (210) is 4.5-50N.

15. A self-locking pinch valve system capable of being powered off, comprising:

the self-locking pinch valve of any of claims 1-14;

the first voltage transformation rectifying module (400), a first output end of the first voltage transformation rectifying module (400) is connected with the first magnet (310) through the first trigger switch (S1), and a second output end of the first voltage transformation rectifying module (400) and the first magnet (310) are grounded;

a second variable-voltage rectification module (500);

the pin 1 of the relay is connected with the first output end of the second transformation rectifying module (500), the pin 2 is respectively connected with the first output end of the second transformation rectifying module (500) and the pin 1, the pin 3 is grounded, and the pin 4 is connected with the second magnet (210);

and one end of the capacitor (C1) is respectively connected with the pin 1 and the pin 2 of the relay and the first output end of the second transformation rectifying module (500), and the other end of the capacitor (C1), the second output end of the second transformation rectifying module (500), the pin 3 of the relay and the second magnet (210) are grounded.

16. The de-energized self-locking pinch valve system of claim 15, wherein: the number of the capacitors (C1) is more than 2, and the capacitors are mutually connected in parallel.

17. A dialysis apparatus comprising the self-locking pinch valve system of any of claims 15-16.