Pipeline switching device

Abstract

The utility model discloses a pipeline switching device, which relates to the technical field of medical instruments and comprises a driving part, a rotating shaft, a movable part, a pressing rod and an n-shaped selector valve, the driving part comprises a driving piece, and the rotating shaft is coaxially and fixedly arranged on a power output shaft of the driving piece; the movable part comprises a supporting plate fixedly installed on the driving piece, a guide shaft horizontally and fixedly installed on the supporting plate and a movable block arranged on the guide shaft in a penetrating mode and in sliding fit with the guide shaft, a movable groove is formed in the movable block, a protrusion is arranged on the rotating shaft, and the protrusion and the rotating shaft are eccentrically arranged; the selection valve is fixedly installed on the surface of the side, away from the driving piece, of the supporting plate, and the pressing rod is fixedly installed on the movable block, penetrates through the selection valve and can horizontally move in the selection valve to clamp a pipeline. The movable groove of the movable block is matched with the protrusion of the rotating shaft, no extra speed reducer device is needed, and transmission efficiency is high, so that the running speed needed by the driving part is greatly reduced, heat generated during working can be reduced, and the service life of the driving part can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a pipeline switching device. Background Technology

[0002] Blood purification primarily involves using specific instruments and equipment to draw a patient's blood out of the body, process it through a certain procedure to remove metabolic waste or toxic substances, and then return the blood to the body. Blood purification requires a blood purification device or equipment equipped with multiple PVC pipelines for transporting various fluids.

[0003] Some blood purification instruments and equipment have tubing that operates in pairs with selective closure: a waste fluid tubing and a dialysate tubing. Under normal treatment conditions, the waste fluid tubing is open, and the dialysate tubing is closed. If an equipment malfunction causes the dialysate temperature to exceed its set range (too high or too low), the dialysate tubing opens, the waste fluid tubing closes, and the dialysate stored for that period is drained until the dialysate temperature returns to normal. Then, the dialysate tubing opens again, and the waste fluid tubing closes. During equipment self-testing or pre-charging, both tubing remains open. Currently, the devices controlling tubing closure mainly consist of fixed and moving parts that interact to clamp the tubing, thus controlling its flow. These tubing closure devices do not come into direct contact with the liquid during operation to prevent contamination.

[0004] However, in the existing technology, the opening and closing of pipelines is mainly achieved by using solenoid valves to drive moving parts to clamp or release the pipelines. This is not only costly and space-consuming, but also the solenoid valves are always energized, generating a lot of heat and noise during operation.

[0005] To address the aforementioned shortcomings, Chinese patent document CN104436340A discloses a tubing selection device for blood purification, comprising a U-shaped bracket. A first through hole is formed in the closed plate of the bracket, and a fixing seat is fixedly connected to the outside of the closed plate. A second through hole is formed in the fixing seat, directly opposite the first through hole. Two mounting seats are fixed on the side of the fixing seat away from the bracket, symmetrically arranged on both sides of the second through hole, and the vertical line connecting the two mounting seats is perpendicular to the side plate of the bracket. A motor is fixed outside one side plate of the bracket, and the output shaft of the motor passes vertically through the side plate and is connected to a lead screw. The center line of the lead screw is perpendicular to the side plate of the bracket. A nut is fitted on the lead screw, and a transmission block is fixedly fitted outside the nut. The transmission block extends towards the first through hole to form a transmission rod. The transmission rod passes through the first and second through holes, and the outer end of the transmission rod is located between the two mounting seats. Driven by the motor, the transmission block moves along the lead screw, and the outer end of the transmission rod moves between the two mounting seats.

[0006] The aforementioned patent employs a screw-nut drive structure. The motor stops working after the pipeline is clamped. The self-locking threaded structure of the screw and nut prevents the clamped portion from retracting, making pipeline access more reliable. Furthermore, the motor stops working after clamping, preventing component overheating. However, because the screw-nut drive is a friction drive, the transmitted power must overcome frictional resistance, resulting in low transmission efficiency. Moreover, friction between the screw and nut leads to wear and fatigue, which can cause failure and malfunction with prolonged use, affecting equipment operation. Utility Model Content

[0007] The purpose of this invention is to provide a pipeline switching device with high transmission efficiency.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a pipeline switching device, comprising a drive unit, a rotating shaft, a movable part, a pressure rod, and a U-shaped selection valve. The drive unit includes a drive component, and the rotating shaft is coaxially fixedly mounted on the power output shaft of the drive component. The movable part includes a support plate fixedly mounted on the drive component, a guide shaft horizontally fixedly mounted on the support plate, and a movable block passing through the guide shaft and slidingly engaging with the guide shaft. A movable groove is formed on the surface of the movable block near the drive component. A protrusion that engages with the movable groove is fixedly mounted on the surface of the rotating shaft away from the drive component, and the protrusion is eccentrically positioned with respect to the rotating shaft. The selection valve is fixedly mounted on the surface of the support plate away from the drive component. The pressure rod is fixedly mounted on the movable block, and the pressure rod passes through the selection valve and can move horizontally within the selection valve to clamp the pipeline.

[0009] The technical principle of this utility model is as follows: the pipeline is set in the clamping part. When the driving component is working, the rotating shaft and the power output shaft of the driving component rotate synchronously. When the rotating shaft rotates, the cooperation between the protrusion and the movable groove is similar to the crank-slider structure, which can convert the rotational motion of the driving component into the linear motion of the movable block. The movable block moves horizontally on the guide shaft, which drives the pressure rod to move horizontally in the selector valve, thereby clamping the pipeline.

[0010] Furthermore, the drive unit also includes a mounting base fixedly mounted on the drive component, a support plate fixedly mounted on the mounting base, and a bearing abutting against the rotating shaft on the mounting base.

[0011] Furthermore, a mounting plate is fixedly installed on the surface of the support plate away from the drive component, the selector valve is fixedly installed on the mounting plate, and the pressure rod passes through the mounting plate and can move horizontally within the selector valve to abut against the pipeline.

[0012] Furthermore, a through hole is opened on the rotating shaft, an eccentric block is provided on the rotating shaft, and a horizontally arranged protruding shaft that can pass through the through hole is fixedly installed on the eccentric block. An elastic element and a locking element that abut against the outer wall of the connecting shaft are coaxially sleeved on the protruding shaft. The protrusion is provided on the surface of the eccentric block away from the driving element.

[0013] Furthermore, a limiting groove is opened in the movable groove, and a bushing is coaxially sleeved on the protrusion.

[0014] Furthermore, it also includes a photoelectric sensor fixedly mounted on the mounting base and a sensing disc coaxially sleeved on the power output shaft of the drive component. The side wall of the mounting base has a through groove, and the sensing disc has a light-transmitting opening that cooperates with the photoelectric sensor.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. By engaging the movable slot of the movable block with the protrusion of the rotating shaft, there is no additional speed reducer, resulting in high transmission efficiency. Therefore, the required operating speed of the drive unit is greatly reduced, which can reduce the heat generated during operation and thus improve the service life of the drive unit.

[0017] 2. Utilizing the characteristics of the crank-slider structure, the maximum stroke of the pressure rod is limited by the movable groove, making the clamping position of the pipeline more precise and reducing the possibility of positional deviation after long-term use;

[0018] 3. Since the photoelectric sensor does not contact the sensing disc, there is no mechanical wear, resulting in a longer service life and greater reliability. Furthermore, the photoelectric sensor can monitor the on / off status of pipeline selection and switching, thus solving the lifespan and accuracy issues of position monitoring sensors. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the movable part in this utility model;

[0022] Figure 4 This is a schematic diagram of the connecting part in this utility model;

[0023] Figure 5 This is a schematic diagram of the eccentric block in this utility model;

[0024] Figure 6 This is an axonometric view of the movable block in this utility model;

[0025] Figure 7 This is an axonometric view of the optical disc in this invention.

[0026] In the above attached figures:

[0027] 1. Drive unit; 101. Drive component; 102. Mounting base; 1021. Through groove; 103. Bearing;

[0028] 201. Rotating shaft; 202. Eccentric block; 2021. Protrusion; 203. Extending shaft; 204. Elastic element; 205. Locking element; 206. Bushing;

[0029] 3. Moving part; 301. Support plate; 302. Guide shaft; 303. Moving block; 3031. Moving groove; 3032. Limiting groove;

[0030] 401. Mounting plate; 402. Selector valve; 403. Pressure rod; 5. Photoelectric sensor;

[0031] 6. Optical disc; 601. Light-transmitting port;

[0032] 7. Piping. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments; the structures described in various embodiments can be freely combined without conflict in terms of structure or principle.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] The following description, in conjunction with the accompanying drawings, describes some embodiments of the present invention:

[0037] like Figures 1-6As shown, this utility model proposes a pipeline switching device, comprising a drive unit 1, a rotating shaft 201, a movable part 3, a pressure rod 403, and a U-shaped selection valve 402. The drive unit 1 includes a drive component 101, and the rotating shaft 201 is coaxially and fixedly mounted on the power output shaft of the drive component 101. The movable part 3 includes a support plate 301 fixedly mounted on the drive component 101, a guide shaft 302 horizontally fixedly mounted on the support plate 301, and a sliding contact between the guide shaft 302 and the guide shaft 302. The movable block 303 has a movable groove 3031 on its lower surface. The upper surface of the rotating shaft 201 has a protrusion 2021 that mates with the movable groove 3031 and is eccentrically positioned with the rotating shaft 201. The selector valve 402 is fixedly mounted on the upper surface of the support plate 301 by bolts. The pressure rod 403 is fixedly mounted on the movable block 303 and passes through the selector valve 402, allowing it to move horizontally within the selector valve 402 to clamp the pipeline 7. The drive unit 1 also includes a mounting base 102 fixedly mounted on the drive component 101. The support plate 301 is fixedly mounted on the mounting base 102, and the mounting base 102 has a bearing 103 that abuts against the rotating shaft 201.

[0038] The drive unit 101 is preferably a 42-type stepper motor with a rated torque of 0.5 N·m. The mounting base 102 is fixedly mounted on the motor with bolts. The lower side of the rotating shaft 201 has a mounting hole that mates with the power output shaft of the drive unit 1, so that the rotating shaft 201 can rotate synchronously with the motor.

[0039] When the motor is running at a constant speed, the moving speed of the pressure rod 403 has a sine / cosine relationship with time. The pressure rod 403 gradually accelerates or decelerates as it approaches or moves away from the pipeline 7, making the switching process of the pipeline 7 smoother and reducing the impact on the pipeline 7. Furthermore, the switching device for this pipeline 7 adopts an inside-out assembly scheme, requiring only the ends of the valve 402 seat and the pressure rod 403 to protrude from the equipment, thus occupying minimal external space and resulting in a simpler and more compact appearance. The bearing 103 further stabilizes the rotation of the shaft 201.

[0040] The pipe 7 is placed inside the clamping part. When the drive member 101 is working, the rotating shaft 201 rotates synchronously with the power output shaft of the drive member 101. When the rotating shaft 201 rotates, it is configured through the cooperation of the protrusion 2021 and the movable groove 3031. The cooperation between the rotating shaft 201 and the movable block 303 is similar to a crank-slider structure, which can convert the rotational motion of the drive member 101 into the linear motion of the movable block 303. The movable block 303 moves horizontally on the guide shaft 302, which drives the pressure rod 403 to move horizontally within the selector valve 402, thereby clamping the pipe 7.

[0041] Furthermore, such as Figures 1-3As shown, a mounting plate 401 is fixedly mounted on the surface of the support plate 301 away from the drive component 101. The selector valve 402 is fixedly mounted on the mounting plate 401. The pressure rod 403 passes through the mounting plate 401 and can move horizontally within the selector valve 402 to abut against the pipeline 7. A limiting groove 3032 is opened in the movable groove 3031, and a bushing 206 is coaxially sleeved on the protrusion 2021.

[0042] Support plates 301 are fixedly mounted on the upper surface of mounting base 102 by bolts. There are two support plates 301, which are symmetrically arranged along the vertical center plane of drive component 101. Guide shafts 302 are arranged between the two support plates 301. To improve the stability of the movement of movable block 303, the number of guide shafts 302 is greater than 2. When the motor starts, the rotating shaft 201 rotates synchronously with the motor, and the eccentric block 202 on the rotating shaft 201 also rotates synchronously. The motor only needs to rotate half a turn to switch the on and off of pipeline 7, reducing the motor running time and the required speed. When the protrusion 2021 is located in the limiting groove 3032, the clamping part clamps the pipeline 7. The limiting groove 3032 can form a self-locking mechanism for the protrusion 2021. When the motor is off, the clamping part can continuously clamp the pipeline 7 without the need for the motor to be continuously turned on, thereby improving the service life of the motor. By setting the bushing 206, the wear between the protrusion 2021 and the movable groove 3031 can be reduced, thereby improving the service life of the device.

[0043] Furthermore, such as Figure 2 , Figure 4 and Figure 5 As shown, a through hole is opened on the rotating shaft 201, and an eccentric block 202 is provided on the rotating shaft 201. A horizontally arranged protruding shaft 203 that can pass through the through hole is fixedly installed on the eccentric block 202. An elastic element 204 and a locking element 205 that abut against the outer wall of the connecting shaft are coaxially sleeved on the protruding shaft 203. A protrusion 2021 is provided on the surface of the eccentric block 202 away from the driving member 101.

[0044] Due to machining errors, assembly errors, and pipe 7 wall thickness errors, a larger driving force is required to clamp the pipe 7. However, the elastic element 204 and the locking element 205 can compensate for the above errors, avoid excessive clamping force between the pressure rod 403 and the selector valve 402, which could damage the pipe 7, and eliminate the need for a motor with a larger torque. Here, the elastic element 204 is preferably a spring.

[0045] Furthermore, such as Figure 2 and Figure 4 and Figure 7As shown, it also includes a photoelectric sensor 5 fixedly installed on the mounting base 102 and a sensing disc 6 coaxially sleeved on the power output shaft of the drive component 101. A through groove 1021 is opened on the side wall of the mounting base 102, and a light-transmitting hole 601 is opened on the sensing disc 6 to cooperate with the photoelectric sensor 5.

[0046] The through slot 1021 allows external light to enter the mounting base 102, where the sensing disc 6 is positioned. The angle between adjacent light-transmitting openings 601 is different, and the sensing disc 6 rotates at a constant speed. The interval between each light transmission during each movement varies. By observing the interval between light transmissions during each movement, the stopping position of the pressure rod 403 can be determined, thus enabling the monitoring of the switching on / off status of the pipeline 7. The photoelectric sensor 5 does not contact the sensing disc, eliminating mechanical wear and extending the lifespan of the sensing disc 6. Simultaneously, the photoelectric sensor 5 can monitor the switching on / off status of the pipeline 7, thus solving the problems of lifespan and accuracy of position monitoring sensors.

Claims

1. A conduit switching device, characterized by: The utility model provides a pipeline switching device, including drive part (1), pivot (201), movable part (3), pressure bar (403) and '' the selection valve (402) of U shape'', drive part (1) includes drive piece (101), pivot (201) coaxial fixed mounting is installed on the power output shaft of drive piece (101), movable part (3) includes fixed mounting on drive piece (101) support plate (301), horizontal fixed mounting on support plate (301) guide shaft (302) and the movable block (303) of wearing and sliding with guide shaft (302) on guide shaft (302), movable block (303) is close to the surface on drive piece (101) one side and opens movable slot (3031), pivot (201) the surface on drive piece (101) one side fixed mounting has with movable slot (3031) cooperation arrangement protruding (2021), and protruding (2021) is arranged eccentric with pivot (201), selection valve (402) fixed mounting is installed on the surface on support plate (301) drive piece (101) one side, pressure bar (403) fixed mounting is installed on movable block (303), and pressure bar (403) penetrates selection valve (402) and can be moved in selection valve (402) horizontal pipe line (7) is clamped.

2. A line switching device according to claim 1, characterized in that Drive part (1) still includes fixed mounting on drive piece (101) mounting seat (102), support plate (301) fixed mounting is installed on mounting seat (102), and mounting seat (102) is provided with the bearing (103) of abutting with pivot (201).

3. A line switching device according to claim 1 or 2, characterised in that Support plate (301) the surface on drive piece (101) one side fixed mounting has mounting plate (401), selection valve (402) fixed mounting is installed on mounting plate (401), and pressure bar (403) penetrates mounting plate (401) and can be moved in selection valve (402) horizontal pipe line (7) is abutted.

4. A line switching device according to claim 1 or 2, characterised in that Pivot (201) is opened with through -hole, and pivot (201) is provided with eccentric block (202), and horizontal setting can be penetrated through -hole's protruding shaft (203) is fixedly installed on eccentric block (202), and protruding shaft (203) is coaxially sleeved with the elastic element (204) set in through -hole and the locking element (205) of abutting with the outer wall of connecting shaft, and protruding (2021) is arranged on the surface on eccentric block (202) drive piece (101) one side.

5. A line switching device according to claim 3, wherein Pivot (201) is opened with through -hole, and pivot (201) is provided with eccentric block (202), and horizontal setting can be penetrated through -hole's protruding shaft (203) is fixedly installed on eccentric block (202), and protruding shaft (203) is coaxially sleeved with the elastic element (204) set in through -hole and the locking element (205) of abutting with the outer wall of connecting shaft, and protruding (2021) is arranged on the surface on eccentric block (202) drive piece (101) one side.

6. A line switching device according to claim 1, 2 or 5, characterised in that Limiting recess (3032) is opened in movable slot (3031), and shaft sleeve (206) is coaxially sleeved on protruding (2021).

7. The pipeline switching device according to claim 3, limiting recess (3032) is opened in movable slot (3031), and shaft sleeve (206) is coaxially sleeved on protruding (2021).

8. The pipe switching device according to claim 4, wherein the movable slot (3031) is provided with a limiting groove (3032), and the convex (2021) is coaxially sleeved with a shaft sleeve (206).

9. A line switching device according to claim 2, 5, 7 or 8, characterised in that The photoelectric sensor (5) is fixedly installed on the mounting seat (102), and the light-sensitive disc (6) is coaxially sleeved on the power output shaft of the driving member (101); a through groove (1021) is formed in the side wall of the mounting seat (102), and the light-sensitive disc (6) is provided with a light transmission port (601) matched with the photoelectric sensor (5).

10. A line switching device according to claim 6, wherein The photoelectric sensor (5) is fixedly installed on the mounting seat (102), and the light-sensitive disc (6) is coaxially sleeved on the power output shaft of the driving member (101); a through groove (1021) is formed in the side wall of the mounting seat (102), and the light-sensitive disc (6) is provided with a light transmission port (601) matched with the photoelectric sensor (5).

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