A power-off normally closed electromagnetic pinch valve

Abstract

The application discloses a power-off normally closed electromagnetic pinch valve, which comprises a double-out-shaft rotary electromagnet, a mounting connecting plate, a pipeline fixing clamp, a blocking column, a lever, a sensor positioning plate, a light shield, a first slot-shaped photoelectric sensor and a second slot-shaped photoelectric sensor. The front end of the double-out-shaft rotary electromagnet is processed into a D-shaped movable chuck, and the movable chuck passes through the center through hole on the back surface of the mounting connecting plate and is jointly arranged with the blocking column fixed on the front surface of the mounting connecting plate to form a hose clamp opening of the pinch valve. The installation positions of the D-shaped movable chuck and the blocking column are designed, so that the pinch valve generates a self-locking effect in the state of clamping the hose, and the clamping force is improved. The light shield is fixed on the rear end of the double-out-shaft rotary electromagnet, and cooperates with the first slot-shaped photoelectric sensor and the second slot-shaped photoelectric sensor mounted on the sensor fixing plate to realize real-time online monitoring of the working state of the pinch valve, and greatly improves the reliability of the working state of the pinch valve.

Description

Technical Field

[0001] This invention relates to an electromagnetic clamp valve. Background Technology

[0002] Pinch valves are crucial components of medical equipment such as blood purification machines, bioartificial livers, and continuous perfusion 3D cell culture systems. They are used to open or close the flow of fluid in tubing. Especially when treating patients with kidney or liver failure using hemodialysis equipment like blood purification machines or bioartificial livers, the patient's blood needs to be pumped into the treatment tubing, purified, and then reinfused into the patient. Throughout the treatment process, real-time online monitoring of any abnormalities in the tubing, such as blood leakage, air bubbles, and fluid levels in the drip chamber, is essential. If any of these occur, the treatment tubing must be immediately shut off to prevent endangering the patient's life. Furthermore, in the event of equipment malfunction, power outage, or grid power failure during treatment, the treatment tubing must also be immediately shut off. Therefore, normally closed pinch valves are commonly used in blood purification machines and bioartificial livers to meet safety requirements. In continuous perfusion 3D cell culture systems, pinch valves are indispensable components for controlling the direction of culture medium flow and balancing pressure within the bioreactor.

[0003] Currently, the pinch valves used in the aforementioned devices are primarily electromagnetically driven. The moving armature reciprocates under the attraction of the electromagnetic coil and the reaction force of the spring, causing the clamp to open or cut off the flow of liquid in the tubing. Due to limitations in the size and power of the pinch valve, the electromagnetic force of the coil and the reaction force of the spring are limited. Therefore, the pinch valves currently in use have a relatively small clamping force on the tubing during operation, and the springs are prone to aging after long-term use, causing a further decrease in the clamping force of the pinch valve. This results in unreliable cutting off of the liquid flow in the tubing. Furthermore, the pinch valves currently in use lack real-time online monitoring of their operating status, or only have limited monitoring capabilities that cannot fully reflect the valve's operating status. This makes it difficult for medical devices using pinch valves to accurately determine their operating status, thus creating certain safety hazards. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of current electromagnetic pinch valves, such as low clamping force, poor reliability, inability to provide real-time online feedback on working status, and inconvenient installation. This invention proposes a normally closed electromagnetic pinch valve designed to withstand power failure. Based on a dual-output shaft rotary electromagnet with a fixed rotation angle, the front output shaft of the dual-output shaft rotary electromagnet is D-shaped to form a D-shaped movable clamp. This clamp, together with a stop pin fixed to the mounting plate, forms the hose clamp of the pinch valve. By designing the installation positions of the D-shaped movable clamp and the stop pin, the pinch valve achieves a self-locking effect when clamping the hose, thereby increasing the clamping force. The greater the liquid pressure inside the hose, the greater the clamping force. A light-shielding plate is fixed to the rear output shaft of the rotary electromagnet and rotates with the shaft of the dual-output shaft rotary electromagnet. Used in conjunction with two slotted photoelectric sensors, it enables real-time online monitoring of the pinch valve's working status, greatly improving the reliability of the pinch valve. The electric pinch valve designed in this invention has a large clamping force, high reliability, is easy to install, and is convenient to use.

[0005] The normally closed electromagnetic clamp valve described in this invention includes a dual-output-shaft rotary electromagnet, a mounting plate, a pipe fixing clamp, a stop post, a lever, a sensor positioning plate, a light-shielding plate, a first slotted photoelectric sensor, and a second slotted photoelectric sensor. The front output shaft of the dual-output-shaft rotary electromagnet is D-shaped to form a D-shaped movable clamp. This D-shaped movable clamp passes through the central hole of the mounting plate from the back and is fixed to the back of the mounting plate. The stop post is fixed to the front of the mounting plate and, together with the D-shaped movable clamp, forms the hose clamp of the clamp valve. The lever is installed under the D-shaped movable clamp of the front output shaft of the dual-output-shaft rotary electromagnet and is used to open the hose clamp when power is off. The irregularly shaped through hole at the center of the pipe fixing clamp passes through the hose clamp and is fixed to the front of the mounting plate. The sensor positioning plate is installed at the rear end of the dual-output-shaft rotary electromagnet, and the first and second slotted photoelectric sensors are fixed to the sensor positioning plate. The light-shielding plate is fixed on the rear output shaft of the dual-output-shaft rotating electromagnet, and the edge of the light-shielding plate is embedded in the first slot-type photoelectric sensor and the second slot-type photoelectric sensor.

[0006] The dual-output shaft rotary electromagnet is cylindrical, with its shaft located on its central axis, and the length of the front output shaft being greater than that of the rear output shaft. When energized, the shaft rotates 45 degrees clockwise; when de-energized, the shaft returns to its initial state under the action of an internal spring. The head of the front output shaft is D-shaped, forming a D-shaped movable clamp for the clamp valve. A countersunk hole is located below the D-shaped movable clamp of the front output shaft for mounting a lever. Three screw holes are evenly distributed around the shaft at the front end of the dual-output shaft rotary electromagnet for fixing a connecting plate. Similarly, three identical screw holes are located at corresponding positions at the front and rear ends for fixing a sensor positioning plate. The rear output shaft of the dual-output shaft rotary electromagnet has a screw hole that penetrates vertically through the rotating shaft of the dual-output shaft rotary electromagnet and is used to install and fix the light-shielding plate.

[0007] The mounting plate has a rounded square cross-section with a circular through-hole at its center. The diameter of the through-hole is slightly larger than the diameter of the rotating shaft of the dual-output shaft rotating electromagnet, allowing the shaft of the dual-output shaft rotating electromagnet to rotate freely without friction after passing through the circular through-hole. On the front of the mounting plate, three countersunk through-holes are evenly distributed around the circular through-hole. The positions of these three countersunk through-holes correspond to the positions of the three screw holes at the front end of the dual-output shaft rotating electromagnet. The diameter of the screw holes is slightly smaller than the diameter of the small countersunk through-hole. The front output shaft of the dual-output shaft rotating electromagnet passes through the central through-hole on the back of the mounting plate and is fixed to the mounting plate through the three countersunk through-holes. On the front of the mounting plate, four screw holes are symmetrically distributed above and below the central through-hole for installing pipe fixing clamps. On the back of the mounting plate, two countersunk through-holes are located on the upper right side near the central through-hole. Near the edge of the back of the mounting plate, there is an annular groove with a semi-circular vertical cross-section. A screw hole is located near each of the four corners of the annular groove.

[0008] The stop post is a column with a rounded isosceles trapezoidal cross-section, and two screw holes are opened at its bottom. The spacing between the two screw holes and the two countersunk through holes on the back of the mounting plate is equal. The diameter of the screw holes is slightly larger than the diameter of the countersunk through holes. The stop post is fixed to the front of the mounting plate through the two screw holes and the two countersunk through holes, and the waist of the trapezoidal bottom of the stop post is tangent to the central through hole of the mounting plate.

[0009] The main body of the lever is a cylindrical metal rod with an arc-shaped groove on its circular cross-section at the top. The curvature of the arc-shaped groove is the same as the curvature of the shaft of the dual-output-shaft rotating electromagnet. A screw hole is opened at the center of the circle, and the central axis of the screw hole is coaxial with the cylindrical metal rod. The tail end of the cylindrical metal rod is chamfered, and a screw hole is opened near the tail end. The central axis of the screw hole is perpendicular to the central axis of the cylindrical metal rod, and a ball-head rod is installed in the screw hole. The lever is fixed to the countersunk through hole of the front output shaft of the dual-output-shaft rotating electromagnet. The central axis of the ball-head rod installed at the tail end of the lever is vertically mounted on the connecting plate, with the ball head facing upwards.

[0010] The pipe clamp has a shaped through hole at its center. The shape of this through hole is the same as the shape of the hose clamp formed by the front output shaft of the double-output shaft rotating electromagnet, and the size of the shaped through hole is slightly larger than the cross-sectional area of ​​the hose clamp. Above and below the shaped through hole of the pipe clamp are two countersunk through holes, the positions of which correspond to the four screw holes on the front of the mounting plate. After passing through the hose clamp, the shaped through hole of the pipe clamp, through the countersunk through holes and the screw holes on the front of the mounting plate, mounts the pipe clamp to the front of the mounting plate. On the right side of the pipe clamp is a fan-shaped annular boss. The upper surface of the boss is flush with the lower edge of the D-shaped movable clamp on the front output shaft of the double-output shaft rotating electromagnet, forming a platform for pipe support. The bottom of the boss is completely hollowed out, forming a fan-shaped annular cavity with the front of the mounting plate. The angle of the fan-shaped annular cavity is slightly larger than the rotation angle of the lever. The pipe fixing clamp has a circular pipe clamp at its upper edge and a hook-shaped pipe clamp at its corresponding lower edge. Both the circular and hook-shaped pipe clamps are perpendicular to the mounting plate. The clamping opening of the circular pipe clamp is at its front end, and the clamping opening of the hook-shaped pipe clamp is on its left side. The centers of the circular and hook-shaped pipe clamps are collinear with the center of the hose clamp formed by the front output shaft of the stop post and the double-output shaft rotating electromagnet.

[0011] The sensor positioning plate is a thin, annular plate, with an outer diameter slightly smaller than the diameter of the dual-output-shaft rotating electromagnet's housing. Three circular through holes are evenly distributed on the sensor positioning plate, their positions corresponding to the screw holes at the rear end of the dual-output-shaft rotating electromagnet. The sensor positioning plate is installed at the rear end of the dual-output-shaft rotating electromagnet and fixed by spring screws, with the spring of the spring screw located between the sensor positioning plate and the dual-output-shaft rotating electromagnet.

[0012] The first slotted photoelectric sensor and the second slotted photoelectric sensor are mounted on a sensor mounting and positioning plate, and the central angle formed by the first slotted photoelectric sensor and the second slotted photoelectric sensor is 90 degrees. The first slotted photoelectric sensor and the second slotted photoelectric sensor described in this invention are of the Sharp GP1A51HR model.

[0013] The light-shielding plate has a fan-shaped structure. A boss with a circular through-hole is located at the center of the light-shielding plate. The diameter of the through-hole is equal to the diameter of the shaft of the dual-output-shaft rotating electromagnet, allowing the shaft of the electromagnet to pass through the through-hole and fit tightly. A countersunk screw hole is located on the left side of the boss, extending from the left to the right side. The diameter of the screw hole on the boss is equal to the diameter of the screw hole on the rear output shaft of the dual-output-shaft rotating electromagnet. The light-shielding plate is fixed to the rear output shaft of the dual-output-shaft rotating electromagnet via the screw hole and rotates together with it. The edge of the light-shielding plate is embedded in the center of the slots of the first and second slotted photoelectric sensors.

[0014] The light-shielding plate has a first square through hole and a second square through hole at its edge, with a central angle of 45 degrees formed by the first and second square through holes. During initial installation, the first square through hole is located within the groove of the first slotted photoelectric sensor, and the first slotted photoelectric sensor is not obstructed by the light-shielding plate; the second square through hole is located between the first and second slotted photoelectric sensors, and the second slotted photoelectric sensor is obstructed by the light-shielding plate.

[0015] When the pinch valve is working normally, it is in the closed state. The first square through hole is located in the slot of the first slot photoelectric sensor, making the first slot photoelectric sensor conductive, while the second slot photoelectric sensor is disconnected. When the pinch valve is opened, the light-shielding plate rotates 45 degrees clockwise with the shaft of the dual-output shaft rotating electromagnet. The first square through hole rotates out of the slot of the first slot photoelectric sensor, making the first slot photoelectric sensor disconnected. At the same time, the second square through hole rotates into the slot of the second slot photoelectric sensor, making the second slot photoelectric sensor conductive.

[0016] The present invention has the following beneficial technical effects:

[0017] The normally closed electromagnetic clamp valve proposed in this invention includes a dual-output shaft rotary electromagnet, a mounting plate, a pipe fixing clamp, a stop post, a lever, a sensor positioning plate, a light-shielding plate, a first slotted photoelectric sensor, and a second slotted photoelectric sensor. The front output shaft of the dual-output shaft rotary electromagnet is D-shaped after machining, forming a D-shaped movable clamp that passes through the central through hole on the back of the mounting plate. Together with the stop post fixed on the front of the mounting plate, it forms the hose clamp of the clamp valve. The design of the installation positions of the D-shaped movable clamp and the stop post enables the clamp valve to generate a self-locking effect when clamping the hose, thereby improving the clamping force. The light-shielding plate is fixed to the rear output shaft of the dual-output shaft rotary electromagnet. Together with the first and second slotted photoelectric sensors mounted on the sensor fixing plate, it enables real-time online monitoring of the clamp valve's operating status, greatly improving the reliability of the clamp valve. This normally closed electromagnetic clamp valve has a large clamping force, high reliability, and is easy to install. It is suitable for equipment such as blood purification machines, bioartificial liver support systems, and cell perfusion culture systems. Attached Figure Description

[0018] Figure 1 This is a front-view perspective view of the normally closed electromagnetic clamp valve of the present invention in the closed state when powered off;

[0019] Figure 2 This is a three-dimensional view of the dual-output shaft rotating electromagnet of the normally closed electromagnetic clamp valve of the present invention.

[0020] Figure 3 This is a perspective view of the mounting connection plate of the normally closed electromagnetic clamp valve of the present invention.

[0021] Figure 4 This is a perspective view of the baffle of the normally closed electromagnetic clamp valve of the present invention when it is de-energized;

[0022] Figure 5 This is a perspective view of the lever of the normally closed electromagnetic clamp valve of the present invention.

[0023] Figure 6 This is a top-view perspective view of the normally closed electromagnetic clamp valve of the present invention.

[0024] Figure 7 This is a left-side bottom perspective view of the normally closed electromagnetic clamp valve of the present invention.

[0025] Figure 8 This is a schematic diagram of the clamping mechanism of the normally closed electromagnetic clamping valve when the power is off according to the present invention.

[0026] In the diagram: 1. Dual-shaft rotating electromagnet; 2. Mounting connection plate; 3. Pipeline fixing clamp; 4. Stop post; 5. Lever; 6. Sensor positioning plate; 7. Light shield; 8. First slot type photoelectric sensor; 9. Second slot type photoelectric sensor. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1As shown, the normally closed electromagnetic clamp valve of the present invention includes a dual-output shaft rotary electromagnet 1, a mounting plate 2, a pipe fixing clamp 3, a stop post 4, a lever 5, a sensor positioning plate 6, a light-shielding plate 7, a first slotted photoelectric sensor 8, and a second slotted photoelectric sensor 9. The front end of the rotating shaft 11 of the dual-output shaft rotary electromagnet 1 passes through the through hole 21 in the center of the mounting plate 2 and is fixed to the back of the mounting plate 2. The stop post 4 is fixed to the front of the mounting plate 2 and forms a hose clamp with the D-shaped movable clamp 111 on the rotating shaft 11 of the dual-output shaft rotary electromagnet 1. The irregular through hole 32 at the center of the pipe fixing clamp 3 passes through the hose clamp and is fixed to the front of the mounting plate 2. The lever 5 is inserted into the cavity below the boss 31 of the pipe fixing clamp 3 and fixed to the front end of the rotating shaft 11 of the dual-output shaft rotary electromagnet 1. The sensor positioning plate 6 is fixed to the rear end of the dual-output shaft rotating electromagnet 1, and the first slotted photoelectric sensor 8 and the second slotted photoelectric sensor 9 are fixed on the sensor positioning plate 6. The light-shielding plate 7 is fixed to the rear output shaft of the rotating shaft 11 of the dual-output shaft rotating electromagnet 1, and the edge of the light-shielding plate 7 is embedded in the slot of the first slotted photoelectric sensor 8 and the second slotted photoelectric sensor 9.

[0029] The dual-output shaft rotary electromagnet 1 has a cylindrical outer shell. When energized, the rotating shaft 11 of the dual-output shaft rotary electromagnet 1 can rotate clockwise by 45 degrees. After de-energization, the rotating shaft 11 of the dual-output shaft rotary electromagnet 1 returns to its initial state under the action of an internal spring. Figure 2 As shown, the front end of the dual-output shaft rotary electromagnet 1 has three screw holes 12, 13, and 14, which are evenly distributed around the rotating shaft 11 at the front end of the dual-output shaft rotary electromagnet 1. At the corresponding position at the rear end of the dual-output shaft rotary electromagnet 1, there are three screw holes 12', 13', and 14', and the screw holes 12', 13', and 14' are the same size as the screw holes 12, 13, and 14. The front end of the rotating shaft 11 of the dual-output shaft rotary electromagnet 1 has a D-shaped movable chuck 111. The chord edge of the D-shaped movable chuck 111 is perpendicular to the line connecting the center of the screw hole 12 and the center of the rotating shaft 11, and the cross-sectional area of ​​the D-shaped movable chuck 111 is approximately one-third of the cross-sectional area of ​​the rotating shaft 11. The countersunk hole 112 is located below the D-shaped movable chuck 111 on the front end of the rotating shaft 11 of the dual-output shaft rotary electromagnet 1. The central axis of the countersunk hole 112 is located at the center of the rotating shaft 11 and is perpendicular to the central axis of the rotating shaft, and forms a 30-degree angle with the line connecting the center of the screw hole 12 and the center of the rotating shaft 11. The screw hole 113 is located at the rear end of the rotating shaft 11 of the dual-output shaft rotary electromagnet 1. The central axis of the screw hole 113 is located at the center of the rotating shaft 11 and is parallel to the central axis of the countersunk hole 112. The screw hole 113 penetrates the rotating shaft 11.

[0030] The mounting connecting plate 2 has a rounded square cross-section, such as... Figure 3As shown, side a of the mounting plate 2 is the front, and side b is the back. The center of the mounting plate 2 has a circular through hole 21. The diameter of the through hole 21 is slightly larger than the diameter of the shaft 11 of the dual-output shaft rotating electromagnet 1, so that the shaft 11 of the dual-output shaft rotating electromagnet 1 can rotate freely without friction after passing through the circular through hole 21 of the mounting plate 2.

[0031] On the front side of the mounting plate 2, three countersunk through holes 24, 25, and 26 are evenly distributed around the circular through hole 21. The positions of the countersunk through holes 24, 25, and 26 correspond to the positions of the three screw holes 12, 13, and 14 at the front end of the dual-output shaft rotating electromagnet 1. The diameter of the countersunk through holes 24, 25, and 26 is slightly larger than the diameter of the screw holes 12, 13, and 14. After the front end of the rotating shaft 11 of the dual-output shaft rotating electromagnet 1 passes through the through hole 21 from the back side of the mounting plate 2, the three countersunk through holes 24, 25, and 26 are connected to the three screw holes 12, 13, and 14 at the front end of the dual-output shaft rotating electromagnet 1 by screws, thereby fixing the dual-output shaft rotating electromagnet 1 to the back side of the mounting plate 2. Four screw holes 27, 28, 29, and 210 are symmetrically distributed above and below the central through hole 21 on the front side of the mounting connecting plate 2. Screw holes 27 and 28 are above the central through hole 21, and screw holes 29 and 210 are below the central through hole 21. Screw holes 27, 28, 29, and 210 are used to fix the pipe fixing clamp.

[0032] The mounting plate 2 has two countersunk through holes 22 and 23 on the upper right side of its back surface near the central through hole 21. An annular groove 215 is located near the edge of the back surface of the mounting plate 2. The vertical cross-section of the groove 215 is semi-circular. At each of the four corners of the mounting plate 2, there is a screw hole, namely screw holes 211, 212, 213, and 214. Screw holes 211, 212, 213, and 214 are located inside the four corners of the annular groove 215. When a clamp valve needs to be installed on the equipment, a silicone sealing strip with a diameter equal to that of the groove 215 is first embedded in the annular groove 215. Then, the clamp valve is fixed to the required equipment through the screw holes 211, 212, 213, and 214.

[0033] The aforementioned stop post 4 is a column with a rounded isosceles trapezoidal base, such as... Figure 4As shown, the bottom of the stop post 4 has two screw holes 42 and 43. The distance between the screw holes 42 and 43 is equal to the distance between the two countersunk through holes 22 and 23 on the back of the mounting connecting plate 2. The diameter of the screw holes 42 and 43 is slightly smaller than the diameter of the countersunk through holes 22 and 23. The stop post 4 is vertically installed on the front side of the mounting connecting plate 2. The screw holes 42 on the stop post 4 correspond to the countersunk through holes 22 on the back of the mounting connecting plate 2, and the screw holes 43 correspond to the countersunk through holes 23 on the back of the mounting connecting plate 2. The bottom edge of the vertical surface 41 of the stop post 4 is tangent to the center through hole 21 of the mounting connecting plate 2. The vertical surface 41 is perpendicular to the plane where the chord of the D-shaped movable chuck 111 is located on the front end of the shaft 11 of the double-output shaft rotary electromagnet 1.

[0034] The main body of the lever 5 is a cylindrical metal rod, such as... Figure 5 As shown, the left end of the lever 5 has an arc-shaped groove 51 on its circular cross-section. The curvature of the arc-shaped groove 51 is equal to the curvature of the shaft 11 of the dual-output-shaft rotating electromagnet 1. A screw hole 52 is opened at the center of the left cross-section of the lever 5. The central axis of the screw hole 52 is coaxial with the cylindrical metal rod of the lever 5. The diameter of the screw hole 52 is slightly smaller than the countersunk through hole 112 on the front end of the shaft 11 of the dual-output-shaft rotating electromagnet 1. The right end of the lever 5 is rounded, and a screw hole 53 is opened near the end. The central axis of the screw hole 53 is perpendicular to the central axis of the cylindrical metal rod of the lever 5. A ball head rod 54 is installed in the screw hole 53. The lever 5 is connected to the countersunk through hole 112 on the front end of the shaft 11 of the dual-output-shaft rotating electromagnet 1 through the screw hole 52, so that the central axis of the ball head rod 54 installed at the end of the lever 5 is perpendicular to the front of the mounting plate 2, and the ball head faces upward.

[0035] The pipe fixing clamp 3 is generally circular, such as Figure 6As shown, the circular through hole in the center of the pipe fixing clamp 3 and the rounded trapezoidal through hole on the upper left side of the circular through hole together form an irregular through hole 32. The shape of the irregular through hole 32 is similar to the shape of the hose clamp formed by the front end of the shaft 11 of the rotating shaft of the double-output shaft rotating electromagnet 1 and the stop post 4. The size of the irregular through hole 32 is slightly larger than the cross-sectional area of ​​the hose clamp. Four countersunk through holes 35, 36, 37, and 38 are symmetrically distributed above and below the circular through hole in the center of the pipe fixing clamp 3. The positions of the countersunk through holes 35, 36, 37, and 38 correspond to the positions of the screw holes 27, 28, 29, and 210 on the front of the mounting connecting plate 2. The diameter of the countersunk through holes 35, 36, 37, and 38 is slightly larger than the diameter of the screw holes 27, 28, 29, and 210. The pipe fixing clamp 3 has a fan-shaped protrusion 31 on its right side. The upper plane of the fan-shaped protrusion 31 is flush with the lower edge of the D-shaped movable clamp 111 on the front end of the rotating shaft 11 of the double-output shaft rotating electromagnet 1, together forming a plane to support the flexible hose. The bottom of the fan-shaped protrusion 31 is completely hollowed out, forming a fan-shaped cavity with the front of the mounting connecting plate 2. The angle of the fan-shaped cavity is slightly larger than the rotation angle of the lever 5. The pipe fixing clamp 3 has a circular pipe clamp 33 at its upper edge and a hook-shaped pipe clamp 34 at its lower edge. Both the circular pipe clamp 33 and the hook-shaped pipe clamp 34 are perpendicular to the mounting connecting plate 2. The clamping mouth of the circular pipe clamp 33 is at the top of the circular pipe clamp 33, and the clamping mouth of the hook-shaped pipe clamp 34 is on the left side of the hook-shaped pipe clamp 34. The center of the circular pipe clamp 33 and the hook-shaped pipe clamp 34 is on the same straight line as the center of the hose clamp formed by the D-shaped movable clamp 111 on the front end of the shaft 11 of the double-output shaft rotating electromagnet 1, and is lower than the plane of the hose support formed by the upper plane of the fan-shaped boss 31 and the lower edge of the D-shaped movable clamp 111 on the front end of the shaft 11 of the double-output shaft rotating electromagnet 1, so as to prevent the hose from coming out of the hose clamp.

[0036] The sensor positioning plate 6 is a thin annular plate, such as... Figure 7 As shown, the outer diameter of the sensor positioning plate 6 is slightly smaller than the outer diameter of the shell of the dual-output-shaft rotating electromagnet 1. Three circular through holes 61, 62, and 63 are evenly distributed on the sensor positioning plate 6. The positions of through holes 61, 62, and 63 correspond to the positions of the screw holes 12', 13', and 14' at the rear end of the dual-output-shaft rotating electromagnet 1. The diameters of through holes 61, 62, and 63 are slightly larger than the diameters of screw holes 12', 13', and 14'. Circular through holes 64 and 65 are symmetrically located at positions opposite to the center of through hole 61 on both sides of the diameter of the sensor positioning plate 6. The diameters and spacing of through holes 64 and 65 are equal to the spacing and diameter of the mounting holes of the first slot-shaped photoelectric sensor 8. Through holes 66 and 67 are located 90 degrees clockwise from through holes 64 and 65.

[0037] The first slotted photoelectric sensor 8 and the second slotted photoelectric sensor 9 are mounted on the sensor positioning plate 6. For example... Figure 7As shown, the first slotted photoelectric sensor 8 is fixed at the through holes 64 and 65 of the sensor positioning plate 6, and the first slotted photoelectric sensor 9 is fixed at the through holes 66 and 67 of the sensor positioning plate 6. The central angle formed by the first slotted photoelectric sensor 8 and the second slotted photoelectric sensor 9 is 90 degrees. The first slotted photoelectric sensor 8 and the second slotted photoelectric sensor 9 described in this invention are of the Sharp GP1A51HR model. The sensor positioning plate 6 is installed at the rear end of the dual-output shaft rotating electromagnet 1 and is fixed by spring screws. The spring of the spring screw is located between the sensor positioning plate 6 and the dual-output shaft rotating electromagnet 1, and the screw hole 12' at the rear end of the dual-output shaft rotating electromagnet 1 corresponds to the through hole 61 of the mounting positioning plate.

[0038] The light-shielding sheet 7 has a fan-shaped annular structure. For example... Figure 7 As shown, the light-shielding plate 7 has a circular boss 71 at its center and a circular through hole 72. The diameter of the through hole 72 is equal to the diameter of the rotating shaft 11 of the dual-output-shaft rotating electromagnet 1, allowing the rotating shaft 11 of the dual-output-shaft rotating electromagnet 1 to pass through the through hole 72 at the center of the light-shielding plate 7 and fit tightly. A countersunk screw hole 711 is formed on the left side of the boss 71, penetrating the entire boss 71. The diameter of the screw hole 711 is equal to the diameter of the screw hole 113 on the rear output shaft of the rotating shaft 1 of the dual-output-shaft rotating electromagnet 1. The light-shielding plate 7 is fixed to the rotating shaft 11 of the dual-output-shaft rotating electromagnet 1 via the screw hole 711 and the screw hole 113 on the rear output shaft of the rotating shaft 11. When the rotating shaft 11 rotates, it drives the light-shielding plate 7 to rotate together. The edge of the light-shielding plate 7 is embedded in the grooves of the first slot-shaped photoelectric sensor 8 and the second slot-shaped photoelectric sensor 9.

[0039] The light-shielding plate 7 has a first square through hole 73 and a second square through hole 74 at its edge, and the central angle formed by the first square through hole 73 and the second square through hole 74 is 45 degrees. During initial installation, the first square through hole 73 is located in the groove of the first groove-shaped photoelectric sensor 8, and the first groove-shaped photoelectric sensor 8 is not blocked by the light-shielding plate 7; the second square through hole 74 is located in the middle position between the first groove-shaped photoelectric sensor 8 and the second groove-shaped photoelectric sensor 9, and the second groove-shaped photoelectric sensor 9 is blocked by the light-shielding plate 7.

[0040] When the pinch valve is operating normally, in the closed state, the first square through-hole 73 is located within the slot of the first slotted photoelectric sensor 8, making the first slotted photoelectric sensor 8 conductive, while the second slotted photoelectric sensor 9 is disconnected due to the light-shielding plate. When the pinch valve is open, the light-shielding plate 7 rotates 45 degrees clockwise with the rotating shaft 11 of the dual-output shaft rotating electromagnet 1, causing the first square through-hole 73 to rotate out of the slot of the first slotted photoelectric sensor 8, making the first slotted photoelectric sensor 8 disconnected due to the light-shielding plate; simultaneously, the second square through-hole 74 rotates into the slot of the second slotted photoelectric sensor 9, making the second slotted photoelectric sensor 9 conductive. Therefore, regardless of whether the pinch valve is closed or open, one of the two slotted photoelectric sensors is conductive and the other is disconnected. By judging the working state of the pinch valve through the two slotted photoelectric sensors, the reliability of the pinch valve operation can be greatly improved.

[0041] The assembly process of the normally closed clamp valve of the present invention is as follows: First, the screw holes 42 and 43 of the stop post 4 are connected to the through holes 22 and 23 of the mounting plate 2 to fix the stop post 4 to the front side of the mounting plate 2. The screw hole 42 on the stop post 4 corresponds to the countersunk through hole 22 on the back side of the mounting plate 2. Second, the rotating shaft 11 of the rotating electromagnet 1 passes through the central through hole 21 of the mounting plate 2 from the back side of the mounting plate 2. The rotating electromagnet 1 is fixed to the mounting plate 2 through the countersunk through holes 24, 25, and 26 on the mounting plate 2 and the screw holes 12, 13, and 14 at the front end of the rotating electromagnet 1. The screw hole 12 at the front end of the rotating electromagnet 1 corresponds to the countersunk through hole 24 on the mounting plate. Third, the lever 5 is fixed to the front end of the rotating shaft 11 of the rotating electromagnet 1 through the screw hole 52 on the lever 5 and the countersunk through hole 112 on the front end of the rotating shaft 11. Fourth step: Secure the pipe fixing clamp 3 to the front of the mounting connection plate through the countersunk through holes 35, 36, 37, and 38 on the pipe fixing clamp 3 and the screw holes 27, 28, 29, and 210 on the front of the mounting connection plate. Fifth step: Fix the first slotted photoelectric sensor 8 to the through holes 64 and 65 on the sensor positioning plate 6, and fix the first slotted photoelectric sensor 9 to the through holes 66 and 67 on the sensor positioning plate 6. Sixth step: Use spring screws to fix the sensor positioning plate 6 to the rear end of the dual-output shaft rotating electromagnet 1 through the through holes 61, 62, and 63 on the sensor positioning plate 6 and the screw holes 12', 13', and 14' at the rear end of the dual-output shaft rotating electromagnet 1. The spring of the spring screw is located between the sensor positioning plate 6 and the dual-output shaft rotating electromagnet 1, and the screw hole 12' at the rear end of the dual-output shaft rotating electromagnet 1 corresponds to the through hole 61 on the mounting positioning plate. Step 7: First, insert the central through hole 72 of the light-shielding plate 7 into the output shaft at the rear end of the rotating shaft 11 of the dual-output-shaft rotating electromagnet 1. Then, rotate the light-shielding plate 7 so that the first square through hole 73 on the edge of the light-shielding plate 7 is located in the groove of the first slot-shaped photoelectric sensor 8. After that, fix the light-shielding plate 7 to the output shaft at the rear end of the rotating shaft 11 of the dual-output-shaft rotating electromagnet 1 through the screw hole 711 on the light-shielding plate 7 and the screw hole 113 on the output shaft at the rear end of the rotating shaft 11 of the dual-output-shaft rotating electromagnet 1.

[0042] The working process of the normally closed clamp valve of the present invention is as follows: Figure 8 As shown, the hose 10 is placed in the hose clamp formed by the D-shaped movable clamp 111 on the front end of the shaft 11 of the double-output shaft rotating electromagnet 1 and the stop post 4. When energized, the D-shaped movable clamp 111 rotates 45 degrees clockwise, opening the hose clamp and allowing the liquid in the hose 10 to flow normally from top to bottom. Figure 8A; When the power is off, the D-shaped movable clamp 111, under the reaction force of the internal spring, squeezes the hose 10 onto the vertical surface 41 of the stop post and clamps it at point p. The hose 10 deforms at point p and presses downwards against the D-shaped movable clamp 111, generating a downward torque on the D-shaped movable clamp 111. This torque generates a counterclockwise rotational force on the D-shaped movable clamp 111, preventing a decrease in clamping force due to clockwise rotation. Furthermore, the greater the pressure inside the hose 10, the greater the downward torque generated on the D-shaped movable clamp 111, thus creating a self-locking effect in the clamping force. Figure 8 B.

[0043] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A normally closed electromagnetic clamp valve that is de-energized, characterized in that, The system includes a dual-output shaft rotary electromagnet, a mounting plate, a pipe fixing clamp, a stop post, a lever, a sensor positioning plate, a light-shielding plate, a first slotted photoelectric sensor, and a second slotted photoelectric sensor. The front output shaft of the dual-output shaft rotary electromagnet is D-shaped after machining to form a D-shaped movable clamp. This D-shaped movable clamp passes through the central hole of the mounting plate from the back and is fixed to the back of the mounting plate. The stop post is fixed to the front of the mounting plate and, together with the D-shaped movable clamp, forms the hose clamp of the pipe clamp valve. The lever... The rod is installed under the D-shaped movable clamp of the front output shaft of the dual-output shaft rotary electromagnet, and is used to open the hose clamp when the power is off; the irregular through hole at the center of the pipe fixing clamp passes through the hose clamp and is fixed to the front of the mounting connection plate; the sensor positioning plate is installed at the rear end of the dual-output shaft rotary electromagnet, and the first slotted photoelectric sensor and the second slotted photoelectric sensor are fixed on the sensor positioning plate; the light shield is fixed on the rear output shaft of the dual-output shaft rotary electromagnet, and the edge of the light shield is embedded in the first slotted photoelectric sensor and the second slotted photoelectric sensor; The dual-output shaft rotary electromagnet is cylindrical, with its shaft located on the central axis of the electromagnet, and the length of the front output shaft being greater than that of the rear output shaft. When energized, the shaft of the dual-output shaft rotary electromagnet can rotate 45 degrees clockwise; after de-energization, the shaft returns to its initial state under the action of an internal spring. The head of the front output shaft of the dual-output shaft is D-shaped, forming a D-shaped movable clamp for a clamp valve. A circular countersunk through hole is opened below the D-shaped movable clamp of the front output shaft of the dual-output shaft rotary electromagnet for installing a lever. Three screw holes are opened at the front end of the dual-output shaft rotary electromagnet, evenly distributed around the shaft, for fixing a connecting plate. Three identical screw holes are opened at the corresponding position at the rear end of the dual-output shaft rotary electromagnet for fixing a sensor positioning plate. A screw hole is opened on the rear output shaft of the dual-output shaft rotary electromagnet, penetrating vertically through the shaft, for installing a light-shielding plate. The mounting plate has a rounded square cross-section with a circular through-hole at its center. The diameter of the circular through-hole is slightly larger than the diameter of the rotating shaft of the dual-output shaft rotating electromagnet, allowing the shaft of the dual-output shaft rotating electromagnet to rotate freely without friction after passing through the circular through-hole of the mounting plate. On the front of the mounting plate, three countersunk through-holes are evenly distributed around the circular through-hole. The positions of the three countersunk through-holes correspond to the positions of the three screw holes at the front end of the dual-output shaft rotating electromagnet. The diameter of the screw holes is slightly smaller than the diameter of the countersunk through-holes. The front output shaft of the dual-output shaft rotating electromagnet passes through the central through-hole on the back of the mounting plate and is fixed to the mounting plate through the three countersunk through-holes. On the front of the mounting plate, four screw holes are symmetrically distributed above and below the central through-hole for installing pipe fixing clamps. On the back of the mounting plate, two countersunk through-holes are opened near the upper right of the central through-hole. Near the edge of the back of the mounting plate, there is an annular groove with a semi-circular vertical cross-section. A screw hole is opened at each of the four corners of the annular groove. When the power is off, the D-shaped movable clamp, under the reaction force of the internal spring, squeezes the hose against the vertical surface of the stop post and clamps it at point p. The hose deforms at point p and presses downward against the D-shaped movable clamp, generating a downward torque on the D-shaped movable clamp. This torque generates a counterclockwise rotation force on the D-shaped movable clamp, preventing the clamping force from decreasing due to clockwise rotation. Moreover, the greater the pressure inside the hose, the greater the downward torque generated on the D-shaped movable clamp, thus forming a clamping force self-locking effect.

2. The normally closed electromagnetic clamp valve according to claim 1, characterized in that, The stop post is a column with a rounded isosceles trapezoidal cross-section. It has two screw holes at its bottom, and the distance between the two screw holes and the two countersunk through holes on the upper right side of the back of the mounting plate near the central through hole is equal. The diameter of the screw holes is slightly smaller than the diameter of the two countersunk through holes on the upper right side of the back of the mounting plate near the central through hole. The stop post is fixed to the front of the mounting plate through the two screw holes and the two countersunk through holes, and the waist of the trapezoidal bottom of the stop post is tangent to the central through hole of the mounting plate.

3. The normally closed electromagnetic clamp valve according to claim 1, characterized in that, The main body of the lever is a cylindrical metal rod with an arc-shaped groove on its top circular cross-section. The curvature of the arc-shaped groove is the same as the curvature of the shaft of the dual-output-shaft rotating electromagnet. A screw hole is opened at the center of the left cross-section of the lever, and the central axis of the screw hole is coaxial with the cylindrical metal rod of the lever. The tail end of the cylindrical metal rod is chamfered, and a screw hole is opened near the tail end. The central axis of the screw hole is perpendicular to the central axis of the cylindrical metal rod. A ball head rod is installed in the screw hole. The lever is fixed on the countersunk through hole of the front output shaft of the dual-output-shaft rotating electromagnet. The central axis of the ball head rod installed at the tail of the lever is perpendicular to the mounting connecting plate, with the ball head facing upward.

4. The normally closed electromagnetic clamp valve according to claim 1, characterized in that, The pipe clamp has a shaped through hole at its center. The shape of the through hole is the same as the shape of the hose clamp formed by the front output shaft of the stop post and the double-output shaft rotating electromagnet. The size of the shaped through hole is slightly larger than the cross-sectional area of ​​the hose clamp. Above and below the shaped through hole of the pipe clamp are two countersunk through holes. The positions of the countersunk through holes correspond to the positions of the four screw holes symmetrically distributed above and below the central through hole on the front of the mounting plate. After the shaped through hole of the pipe clamp passes through the hose clamp, the pipe clamp is installed on the front of the mounting plate through the countersunk through holes and the screw holes on the front of the mounting plate. The right side of the pipe clamp has a fan-shaped boss. The upper surface of the fan-shaped boss is aligned with the double-output shaft rotating electromagnet. The lower edge of the D-shaped movable clamp on the front end of the rotating electromagnet is flush with the ground, forming a platform to support the pipeline. The bottom of the fan-shaped boss is completely hollowed out, forming a fan-shaped cavity with the front of the mounting plate. The angle of the fan-shaped cavity is slightly larger than the rotation angle of the lever. The upper edge of the pipeline fixing clamp has a circular pipe clamp, and the corresponding lower edge has a hook-shaped pipe clamp. Both the circular and hook-shaped pipe clamps are perpendicular to the mounting plate. The clamping mouth of the circular pipe clamp is at the front end of the circular pipe clamp, and the clamping mouth of the hook-shaped pipe clamp is on the left side of the hook-shaped pipe clamp. The center of the circular and hook-shaped pipe clamps is on the same straight line as the center of the hose clamp formed by the stop post and the front end of the rotating electromagnet.

5. The normally closed electromagnetic pinch valve according to claim 1, characterized in that, The sensor positioning plate is a thin, annular plate, and its outer diameter is slightly smaller than the diameter of the housing of the dual-output shaft rotating electromagnet. Three circular through holes are evenly distributed on the sensor positioning plate, and their positions correspond to the positions of the three screw holes at the rear end of the dual-output shaft rotating electromagnet. The sensor positioning plate is installed at the rear end of the dual-output shaft rotating electromagnet and fixed by spring screws. The spring of the spring screw is located between the sensor positioning plate and the dual-output shaft rotating electromagnet.

6. The normally closed electromagnetic clamp valve according to claim 1, characterized in that, The first slotted photoelectric sensor and the second slotted photoelectric sensor are mounted on the sensor mounting and positioning plate, and the central angle formed by the first slotted photoelectric sensor and the second slotted photoelectric sensor is 90 degrees; the model of the first slotted photoelectric sensor and the second slotted photoelectric sensor is Sharp GP1A51HR.

7. The normally closed electromagnetic clamp valve according to claim 1, characterized in that, The light-shielding plate has a fan-shaped structure with a boss at its center and a circular through hole. The diameter of the circular through hole is equal to the diameter of the shaft of the dual-output-shaft rotating electromagnet, allowing the shaft of the dual-output-shaft rotating electromagnet to pass through the through hole of the light-shielding plate and fit tightly. A countersunk screw hole is opened on the left side of the boss, and the screw hole extends from the left side to the right side of the boss. The diameter of the screw hole on the boss is equal to the diameter of the screw hole on the rear output shaft of the dual-output-shaft rotating electromagnet. The light-shielding plate is fixed to the rear output shaft of the dual-output-shaft rotating electromagnet through the screw hole and rotates together with it. The edge of the light-shielding plate is embedded in the center of the groove of the first slot-type photoelectric sensor and the second slot-type photoelectric sensor. The light-shielding plate has a first square through hole and a second square through hole at its edge. The central angle formed by the first square through hole and the second square through hole is 45 degrees. During initial installation, the first square through hole is located inside the groove of the first groove-shaped photoelectric sensor, and the first groove-shaped photoelectric sensor is not blocked by the light-shielding plate. The second square through hole is located between the first groove-shaped photoelectric sensor and the second groove-shaped photoelectric sensor, and the second groove-shaped photoelectric sensor is blocked by the light-shielding plate.

8. A normally closed electromagnetic clamp valve according to claim 7, characterized in that, When the pinch valve is working normally, it is in the closed state. The first square through hole is located in the slot of the first slot photoelectric sensor, making the first slot photoelectric sensor conductive, while the second slot photoelectric sensor is disconnected. When the pinch valve is opened, the light-shielding plate rotates 45 degrees clockwise with the shaft of the dual-output shaft rotating electromagnet. The first square through hole rotates out of the slot of the first slot photoelectric sensor, making the first slot photoelectric sensor disconnected. At the same time, the second square through hole rotates into the slot of the second slot photoelectric sensor, making the second slot photoelectric sensor conductive.

Images