Needle cannula snap connection device
By designing a needle-clamping connection device, a stable connection between the needle and the liquid storage container is achieved using a pawl self-locking structure. This solves the problems of material waste and uneven addition caused by needle detachment, and improves the efficiency and economy of food production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA YILI IND GROUP CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-19
AI Technical Summary
During food production, syringes may accidentally detach due to machine vibration, leading to uneven material addition and waste.
A syringe snap-fit connection device was designed, including a housing, a knob, a rocker arm, a pawl, and a moving block. The pawl self-locking structure enables a tight connection between the syringe and the liquid storage container, preventing it from falling off.
This ensures the sterility and uniformity of material addition, reduces material waste caused by syringe detachment, improves production efficiency, and reduces economic costs.
Smart Images
Figure CN224376031U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of material addition, and in particular to a needle tube snap-fit connection device. Background Technology
[0002] During food production, syringes on aseptic dosing lines may accidentally detach due to machine vibration, resulting in material waste and uneven dosing.
[0003] For example, when it is necessary to aseptically add materials such as enzymes and probiotics to a bacterial solution bag, one end of the syringe is usually pierced through the valve at the bag opening to enter the bacterial solution bag, and the other end of the syringe is connected to the aseptic addition production line through a connecting tube to deliver the material to the bacterial solution bag through the aseptic addition production line; however, during this addition process, the syringe may accidentally fall off due to vibration, affecting the uniformity of material addition and causing waste. Utility Model Content
[0004] The purpose of this invention is to provide a syringe snap-fit connection device that can achieve a stable and reliable connection between the syringe and the liquid storage container, avoiding accidental dislodgement of the syringe and resulting waste of materials and uneven addition.
[0005] The purpose of this utility model is achieved as follows: a needle clamping connection device includes a housing, a knob rotatably disposed outside the housing, and a rocker arm, a pawl, and a moving block disposed inside the housing. The moving block can move along the length direction of the housing. A groove is provided on the housing directly opposite the first end of the moving block for engaging the interface of a liquid storage container. An installation groove is provided on the bottom surface of the moving block, extending through both ends along its length direction, for engaging a needle. The needle tip of the needle can extend out of the first end of the moving block and face the interface, and the second end of the needle can extend out of the second end of the moving block and protrude from the housing. Multiple slots are evenly spaced along the length direction on the top surface of the moving block. The knob is fixed to the first end of the rocker arm via a connecting rod inserted into the housing. The first end of the pawl is hinged to the second end of the rocker arm, and the second end of the pawl is provided with a locking block. The locking block can engage in the corresponding slot each time the rocker arm moves to the lowest position close to the moving block, and can also push the moving block towards the interface when the rocker arm rotates towards the first end of the moving block, so that the needle tip penetrates the interface and extends into the liquid storage container.
[0006] In a preferred embodiment of the present invention, the rocker arm includes a first rod and a second rod that are vertically fixed together. The first rod is fixedly connected to a connecting rod, and the first end of the pawl is hinged to the second rod.
[0007] In a preferred embodiment of this utility model, the needle tube includes a needle tip and a needle tube body. The needle tip is connected to the first end of the needle tube body. A connecting ring is sleeved in the middle of the needle tube body. Two connecting plates are symmetrically arranged on both sides of the needle tube body near its second end. The ends of the connecting plates are connected to the connecting ring. The mounting groove includes a first limiting groove, a receiving groove, and a second limiting groove connected sequentially from the first end to the second end of the moving block. The second limiting groove is a rectangular groove. The first end of the needle tube body can be locked and limited in the first limiting groove. The connecting ring can be locked in the receiving groove. The two connecting plates can be locked and limited in the second limiting groove.
[0008] In a preferred embodiment of the present invention, the outer shell is a rectangular shell, the movable block is a rectangular block, and two limiting plates are provided inside the outer shell at intervals along its width direction. The length direction of the limiting plates extends along the length direction of the outer shell. The two limiting plates and the bottom surface of the outer shell enclose a rectangular cavity. The movable block is movably disposed in the rectangular cavity. The second end of the pawl can pass through the gap between the two limiting plates so that the locking block can be locked in the corresponding locking groove.
[0009] In a preferred embodiment of the present invention, two limiting blocks are provided on the plate surface of the two limiting plates facing away from the moving block. The gap between the two limiting blocks is smaller than the interval between the two limiting plates, and the second end of the pawl can swing through the gap between the two limiting blocks.
[0010] In a preferred embodiment of the present invention, the groove opening is connected to the bottom surface of the outer shell, and the two ends of the groove along the length direction of the outer shell are respectively connected to the corresponding end face of the outer shell and the interior of the outer shell. Two limiting parts protruding from the groove wall are formed at both ends of the groove. The interface is a cylindrical structure, and the interface can be locked in the groove and the two ends of the interface can be axially limited between the two limiting parts.
[0011] In a preferred embodiment of the present invention, an opening is provided on the bottom surface of the outer casing that faces the mounting groove.
[0012] In a preferred embodiment of the present invention, a push rod that can extend and retract along the length of the movable block is also provided on the outer shell. A part of the push rod extends into the outer shell and can move toward the first end of the movable block to lift the pawl and disengage the block from the corresponding slot.
[0013] In a preferred embodiment of the present invention, the first end of the push rod forms a baffle with an increased diameter, the second end of the push rod can move through the side wall of the housing and extend into the interior of the housing, and a spring is also sleeved on the push rod, the two ends of the spring can respectively abut against and connect between the baffle and the outer wall of the housing.
[0014] In a preferred embodiment of this utility model, the outer shell, knob, rocker arm, pawl, locking block, and moving block are all made of food-grade materials.
[0015] As described above, the needle clamping connection device of this utility model, through the cooperation of a knob, rocker arm, pawl, and moving block, uses a crank-rocker arm to drive the pawl to move, which in turn drives the moving block. When the knob is stopped, the pawl will lock into the corresponding slot, restricting the reverse movement of the moving block, thus forming a pawl self-locking structure. This achieves a tight connection between the needle and the liquid storage container. Moreover, even without actively rotating the knob, and with slight vibration of the overall structure, the pawl will not move and will be stably locked in the slot, ensuring a firm and stable connection and preventing the needle from falling off. This greatly reduces the risk of the needle separating from the liquid storage container during production. When applied to aseptic addition, it ensures the asepticity and uniformity of addition, avoiding waste of added materials. The entire device is easy to operate; production personnel can complete the connection without complicated procedures. The connection between the moving block and the needle, as well as the connection between the liquid storage container and the outer shell, are both convenient, improving work efficiency. The entire device has a relatively simple structure and low cost, making it suitable for large-scale production and promotion. It helps reduce the economic costs caused by material waste due to needle detachment and uneven product addition. Attached Figure Description
[0016] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:
[0017] Figure 1 A schematic diagram of the needle buckle connection device provided by this utility model, in which the installed needle does not penetrate the liquid storage container.
[0018] Figure 2 A schematic diagram of the structure of the needle buckle connection device provided by this utility model after the installed needle penetrates the liquid storage container.
[0019] Figure 3 This is an internal schematic diagram of the needle tube snap-fit connection device provided by this utility model.
[0020] Figure 4 A partial enlarged view of the needle tube buckle connection device provided by this utility model at the push rod.
[0021] Figure 5 A schematic diagram illustrating the interaction of the knob, rocker arm, pawl, and moving block provided by this utility model.
[0022] Figure 6 A schematic diagram of the outer casing provided by this utility model.
[0023] Figure 7 A schematic diagram of the movable block provided by this utility model.
[0024] Figure 8 A schematic diagram of the knob provided by this utility model.
[0025] Figure 9 A schematic diagram of the rocker arm provided by this utility model.
[0026] Figure 10 Schematic diagram of the pawl provided by this utility model Figure 1 .
[0027] Figure 11 Schematic diagram of the pawl provided by this utility model Figure 2 .
[0028] Figure 12 A schematic diagram of the push rod provided by this utility model.
[0029] Figure 13 This is a schematic diagram of the liquid storage container provided by this utility model when it is a bacterial liquid bag.
[0030] Figure 14 Schematic diagram of the syringe provided by this utility model Figure 1 .
[0031] Figure 15 Schematic diagram of the syringe provided by this utility model Figure 2 .
[0032] Explanation of icon numbers:
[0033] 1. Outer shell; 11. Groove; 12. Limiting plate; 13. Limiting block; 14. Limiting part; 15. Partition; 16. Opening; 17. Mounting cylinder; 181. First through hole; 182. Second through hole;
[0034] 2. Knob; 21. Connecting rod; 211. First retaining ring;
[0035] 3. Rocker arm; 31. First rod body; 311. First mounting hole; 32. Second rod body; 321. Annular groove;
[0036] 4. Pawl; 40. Second mounting hole; 41. Locking block;
[0037] 5. Moving block; 51. Mounting slot; 511. First limiting slot; 512. Receiving slot; 513. Second limiting slot; 52. Card slot;
[0038] 6. Push rod; 61. Baffle; 62. Spring; 63. Button;
[0039] 7. Syringe; 71. Needle tip; 72. Syringe body; 73. Connecting ring; 74. Connecting plate;
[0040] 8. Liquid storage container; 81. Interface. Detailed Implementation
[0041] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.
[0042] like Figures 1 to 15 As shown, this application provides a needle tube snap-fit connection device, including a housing 1, a knob 2 rotatably disposed outside the housing 1, and a rocker arm 3, a pawl 4, and a moving block 5 disposed inside the housing 1; the moving block 5 can move along the length direction of the housing 1, and a groove 11 is provided on the housing 1 at the position directly opposite the first end of the moving block 5 for snapping into the interface 81 of the liquid storage container 8; an installation groove 51 is provided on the bottom surface of the moving block 5, extending through both ends along its length direction, for snapping into the needle tube 7, the needle tip 71 of the needle tube 7 can extend out of the first end of the moving block 5 and directly opposite the interface 81, and the second end of the needle tube 7 can extend out of the second end of the moving block 5 and can extend out of the housing 1.
[0043] Multiple slots 52 are evenly spaced along the length of the top surface of the movable block 5. The knob 2 is fixed to the first end of the rocker arm 3 via a connecting rod 21 that passes through the outer shell 1. The first end of the pawl 4 is hinged to the second end of the rocker arm 3. The second end of the pawl 4 is provided with a locking block 41. The locking block 41 can be locked in the corresponding slot 52 each time the rocker arm 3 moves to the lowest position close to the movable block 5. It can also push the movable block 5 to move towards the interface 81 when the rocker arm 3 rotates towards the first end of the movable block 5, so that the needle 71 penetrates the interface 81 and extends into the liquid storage container 8.
[0044] The outer casing 1 protects all other components. It has a first through hole 181 and a second through hole 182 for the connecting rod 21 and the second end of the needle tube 7 to pass through, respectively. The second end of the needle tube 7 extends out of the outer casing 1 and can be used to connect to an aseptic addition production line to deliver materials to the storage container 8. The connecting rod 21 can rotatably pass through the first through hole 181; bearings can also be added as needed. The knob 2 is a cylindrical block structure with its axis perpendicular to the length of the outer casing 1. The knob 2 is coaxially connected to the connecting rod 21 and serves as the power source, rotating manually. The rocker arm 3 can change the mode of motion and forms a crank-rocker mechanism with the knob 2. The pawl 4, as a motion transmission component, can push the moving block 5 towards the interface 81 (also called the connector) and can restrict the moving block 5 from moving in the opposite direction after the knob 2 is stopped; the plane in which the pawl 4 moves is parallel to the length of the moving block 5. The movable block 5 serves as a carrier for the needle tube 7, which can fix the needle tube 7 and drive the needle tube 7 to move, so that the needle tip 71 of the needle tube 7 penetrates the interface 81 of the liquid storage container 8, and the needle tube 7 and the liquid storage container 8 fit together tightly.
[0045] The aforementioned liquid storage container 8 can be, for example, a liquid storage bag or a liquid storage bottle (e.g., a bacterial solution bag or an infusion bottle). Taking a bacterial solution bag as an example of a liquid storage container 8 used in an aseptic addition production line, the interface 81 of the bacterial solution bag can also be called a bag valve. In use, the needle 7 is inserted into the mounting groove 51 of the moving block 5, and then the moving block 5 with the needle 7 installed is installed inside the outer casing 1, so that the second end of the needle 7 protrudes from the outer casing 1 and connects to the aseptic addition production line. The bag valve of the bacterial solution bag is inserted into the groove 11 of the outer casing 1, at which time the needle 71 is aligned with the bag valve.
[0046] The entire device is positioned horizontally along the length of the moving block 5, with the pawl 4 above the moving block 5. Figure 3 As shown, manually rotating knob 2 clockwise causes rocker arm 3 to swing clockwise, and pawl 4 on rocker arm 3 moves accordingly. During rotation, rocker arm 3 has a lowest position close to moving block 5 and a highest position far from moving block 5. When rocker arm 3 is at its lowest position, the locking block 41 on pawl 4 is at its lowest point and is engaged in the corresponding slot 52. As rocker arm 3 continues to rotate clockwise, it rises from its lowest position, generating a thrust towards the first end of moving block 5, causing the locking block 41 on pawl 4 to push moving block 5 forward (i.e., push moving block 5 towards the interface 81). As the joystick 3 gradually rises, the locking block 41 on the pawl 4 also gradually rises and disengages from the slot 52. When the joystick 3 reaches its highest position, the locking block 41 on the pawl 4 is also at its highest point. When the joystick 3 moves back to its lowest position, the locking block 41 on the pawl 4 is again at its lowest point and locked in the corresponding slot 52. When the locking block 41 rises again with the joystick 3, it will push the moving block 5 forward again; this process repeats.
[0047] Initially, the joystick 3 is in its lowest position, and the locking block 41 is at its lowest point and locked in the corresponding slot 52. During repeated rotations of the knob 2, the joystick 3 continuously rotates from its lowest position to its highest position and back to its lowest position. The locking block 41 on the pawl 4 also continuously swings from its lowest point to its highest point and back to its lowest point. Each time the locking block 41 reaches its lowest point, it locks in the corresponding slot 52. As the locking block 41 continues to swing and disengages from the slot 52, it pushes the moving block 5 forward once. Each rotation of the knob 2... Rotating knob 2 multiple times will cause the moving block 5 to move forward once. After multiple rotations, the moving block 5 will drive the syringe 7 to move continuously towards the bag valve, gradually piercing it. When the moving block 5 reaches the appropriate position, the needle 71 of the syringe 7 will pierce the bag valve and extend a certain length into the bacterial bag. Stopping knob 2 will cause the locking block 41 on the pawl 4 to engage in the corresponding slot 52, restricting the moving block 5 from moving in the opposite direction (i.e., moving away from the interface 81), thus achieving a tight connection between the syringe 7 and the bacterial bag. After connecting the syringe 7 and the bacterial bag, the bacterial bag can be placed with the bag valve facing down or up. With the moving block 5 vertically positioned, the aseptic addition line can then deliver the corresponding material into the bacterial bag via the syringe 7.
[0048] Therefore, the needle clamping connection device of this application, through the cooperation of knob 2, rocker arm 3, pawl 4 and moving block 5, drives the pawl 4 to move in the form of a crank rocker arm, thereby driving the moving block 5. When the knob 2 is stopped, the pawl 4 will be locked in the corresponding slot 52, which can restrict the reverse movement of the moving block 5, thus forming a pawl self-locking structure. This achieves a tight connection between the needle 7 and the liquid storage container 8. Moreover, even if there is slight vibration of the overall structure without actively rotating the knob 2, the pawl 4 will not move and will be stably locked in the slot 52. The connection is firm and stable, preventing the needle 7 from falling off, and greatly reducing the risk of separation between the needle 7 and the liquid storage container 8 during production. When applied to aseptic addition, it ensures the asepticity and uniformity of addition, avoiding waste of added materials. The entire device is easy to operate. Production staff can complete the connection without complicated operating procedures. The connection between the moving block 5 and the needle 7, as well as the connection between the liquid storage container 8 and the outer shell 1, are relatively convenient, improving work efficiency. The entire device has a relatively simple structure and low cost, making it suitable for large-scale production and promotion. It helps reduce the economic costs caused by material waste due to needle 7 falling off and uneven product addition.
[0049] In the specific implementation method, refer to Figure 9 The rocker arm 3 includes a first rod 31 and a second rod 32 that are vertically fixed together. The first rod 31 is fixed to the connecting rod 21, and the first end of the pawl 4 is hinged to the second rod 32.
[0050] For ease of connection, optional, refer to Figure 5 as well as Figures 8 to 11 The connecting rod 21 is a round rod structure. The first end of the connecting rod 21 is fixed to the center of the knob 2, and the second end of the connecting rod 21 is fitted with two spaced-apart first fixing rings 211. The first rod body 31 is a long strip plate structure, and its plate surface is perpendicular to the axis of the connecting rod 21. The first end of the first rod body 31 is provided with a first mounting hole 311. The first rod body 31 is fitted and fixed to the second end of the connecting rod 21 through the first mounting hole 311 and is located between the two first fixing rings 211. The second rod 32 is a round rod structure, and its axis is perpendicular to the plate surface of the first rod 31 and parallel to the axis of the connecting rod 21. The first end of the second rod 32 is fixedly connected to the second end of the first rod 31. An annular groove 321 is formed on the outer wall of the second rod 32 near its first end. The pawl 4 is a long strip plate structure, and its plate surface is perpendicular to the axis of the second rod 32. A second mounting hole 40 is provided at the first end of the pawl 4. The first end of the pawl 4 can be oscillatingly sleeved on the annular groove 321 through the second mounting hole 40 to form a hinge with the second rod 32.
[0051] A locking block 41 is formed at the second end of the pawl 4 and can be integrally formed with the pawl 4. The locking block 41 can be a rectangular plate, and correspondingly, the aforementioned locking groove 52 can be a rectangular groove. The dimensions of the locking block 41 and the locking groove 52 are matched to achieve stable engagement. The plate surface of the locking block 41 is perpendicular to the top surface of the moving block 5, and there is an angle between the plate surface of the locking block 41 and the length direction of the pawl 4, which is generally an obtuse angle. The specific angle between the pawl 4 and the locking block 41, the interval between two adjacent locking slots 52, and the length of the rocker arm 3 and the pawl 4 are all designed according to the actual situation to ensure that when the rocker arm 3 is at its lowest position and the locking block 41 is at its lowest point, the locking block 41 can be locked in the corresponding locking slot 52. After the knob 2 is rotated one revolution, the locking block 41 can be locked in another adjacent locking slot 52. After the knob 2 is rotated multiple revolutions, the locking block 41 can continuously and sequentially engage multiple locking slots 52 arranged in sequence from its first end to its second end on the moving block 5, and continuously push the moving block 5 forward multiple times. For example, in the initial state, the slot 52 that the locking block 41 engages with is called the first slot. According to the direction of the moving block 5 from the first end to the second end, the multiple slots 52 behind the first slot are respectively called the second slot, the third slot, and so on. After the knob 2 is rotated for the first turn, the locking block 41 engages with the second slot. After the knob 2 is rotated for the second turn, the locking block 41 engages with the third slot, and so on.
[0052] Of course, the fixing between the connecting rod 21 and the rocker arm 3, and the hinge between the rocker arm 3 and the pawl 4 can also be done in other ways. This embodiment is only for illustrative purposes.
[0053] Further optionally, to facilitate the locking and fixing of the movable block 5 to the needle tube 7, refer to Figure 1 , Figure 7 , Figure 14 and Figure 15 The needle tube 7 includes a needle tip 71 and a needle tube body 72. The needle tip 71 is connected to the first end of the needle tube body 72. A connecting ring 73 is sleeved in the middle of the needle tube body 72. Two connecting plates 74 are symmetrically arranged on both sides of the needle tube body 72 near its second end. The ends of the connecting plates 74 are connected to the connecting ring 73. The mounting groove 51 includes a first limiting groove 511, a receiving groove 512, and a second limiting groove 513 connected sequentially from the first end to the second end of the moving block 5. The second limiting groove 513 is a rectangular groove. The first end of the needle tube body 72 can be locked and limited in the first limiting groove 511, the connecting ring 73 can be locked in the receiving groove 512, and the two connecting plates 74 can be locked and limited in the second limiting groove 513.
[0054] The needle body 72 is a circular hollow tube, and the needle tip 71 is a hollow conical pointed structure with a discharge hole at the tip. The two connecting plates 74 can be rectangular plates. The needle body 72, needle tip 71, connecting ring 73, and two connecting plates 74 can be integrally formed. The opening of the entire mounting groove 51 connects to the bottom surface of the moving block 5, and the mounting groove 51 connects to the two end faces of the moving block 5 along both ends of the moving block 5. The first limiting groove 511 is a U-shaped groove, and the two ends of the U-shaped groove connect the first end face of the moving block 5 and the mounting groove 51, respectively. The groove wall of the U-shaped groove includes an arc-shaped surface and two parallel planes connected to both sides of the arc-shaped surface. The distance between the two planes should match the diameter of the portion of the needle body 72 near its first end. The receiving groove 512 is an arc-shaped groove, and the cross-section of the arc-shaped groove along its axial direction is semi-circular. The diameter of the semi-circular shape should match the diameter of the connecting ring 73. The second limiting groove 513 is a rectangular groove. The two ends of the rectangular groove are respectively connected to the receiving groove 512 and the second end face of the moving block 5. The width of the rectangular groove along the width direction of the moving block 5 should match the distance between the outer surfaces of the two connecting plates 74 facing each other.
[0055] During installation, the needle tube 7 is inserted into the mounting groove 51 through the opening of the mounting groove 51, so that the part of the needle tube body 72 near its first end is inserted into the first limiting groove 511, and the first end of the needle tube body 72 and the needle tip 71 extend out of the first end of the moving block 5; the connecting ring 73 is inserted into the receiving groove 512, and the two connecting plates 74 are inserted into the second limiting groove 513 with the plate surface perpendicular to the bottom surface of the moving block 5. Due to the presence of the two connecting plates 74, the rotation of the needle tube 7 in the moving block 5 can be prevented. By limiting and fixing the needle tube body 72 and the two connecting plates 74 through the first limiting groove 511 and the second limiting groove 513, the moving block 5 and the needle tube 7 can be reliably fixed.
[0056] Further optional, see Figure 1 , Figure 3 , Figure 6 and Figure 7 The outer shell 1 is a rectangular shell, and the moving block 5 is a rectangular block. Inside the outer shell 1, there are two limiting plates 12 that are spaced apart along its width direction. The length direction of the limiting plates 12 extends along the length direction of the outer shell 1. The two limiting plates 12 and the bottom surface of the outer shell 1 enclose a rectangular cavity. The moving block 5 is movably disposed in the rectangular cavity. The second end of the pawl 4 can pass through the gap between the two limiting plates 12 so that the locking block 41 can be locked in the corresponding locking groove 52.
[0057] The bottom and top surfaces of the outer casing 1 mentioned in the text are two opposite plates along its height direction in the rectangular casing. Two limiting plates 12 are connected to two opposite sides of the outer casing 1, and the gap between the two limiting plates 12 allows the pawl 4 to pass through when swinging. The aforementioned first through hole 181 is opened on one side of the outer casing 1 to allow the connecting rod 21 to pass through. The axis of the connecting rod 21 is perpendicular to the side of the outer casing 1. The rocker arm 3 and the pawl 4 are installed in the area between the top surface of the outer casing 1 and the limiting plate 12. The distance between the limiting plate 12 and the bottom surface of the outer casing 1, as well as the width of the outer casing 1, should match the height and width of the moving block 5, and be slightly larger than the height and width of the moving block 5, to limit the moving block 5 in the height and width directions, ensuring that the moving block 5 moves along its length direction. This aims to ensure that the needle 71 is coaxial with the interface 81 of the liquid storage container 8, preventing the moving block 5 from becoming skewed in the width direction, which could cause the needle 71 to become skewed and affect the needle 71's ability to penetrate the interface 81 of the liquid storage container 8.
[0058] The lowest position of the joystick 3 mentioned above is the position closest to the moving block 5 in the trajectory of the joystick 3's movement. That is, when the moving block 5 is placed horizontally with its top surface facing upwards, the joystick 3 moves to its lowest position. Similarly, the lowest point of the locking block 41 is the position closest to the moving block 5 in the trajectory of the locking block 41's movement. When the moving block 5 is placed horizontally with its top surface facing upwards, the locking block 41 moves to its lowest position, at which point the locking block 41 can be locked into the corresponding slot 52.
[0059] Further optional, see Figure 1 and Figure 6 Two limiting blocks 13 are provided on the plate surface of the two limiting plates 12 facing away from the moving block 5. The gap between the two limiting blocks 13 is smaller than the gap between the two limiting plates 12. The second end of the pawl 4 can swing through the gap between the two limiting blocks 13.
[0060] The limiting block 13 can be a rectangular block, for example. The two limiting blocks 13 can also be connected to the two sides of the outer shell 1. The gap between the two limiting blocks 13 should match the thickness of the pawl 4 plate, and be slightly larger than the thickness of the pawl 4 plate. The pawl 4 can be left and right limited in the width direction of the outer shell 1 to prevent the pawl 4 from wobbling left and right, which would cause the needle 71 to become crooked and affect the needle 71 from penetrating the interface 81 of the liquid storage container 8.
[0061] Further optionally, in order to facilitate the snap-fit fixing of the interface 81 of the liquid storage container 8, the groove of the groove 11 is connected to the bottom surface of the outer shell 1, and the two ends of the groove 11 along the length direction of the outer shell 1 are respectively connected to the corresponding end face of the outer shell 1 and the interior of the outer shell 1, and two limiting parts 14 protruding from the groove wall are formed at both ends of the groove 11; the interface 81 is a cylindrical structure, the interface 81 can be snapped in the groove 11 and the two ends of the interface 81 can be axially limited between the two limiting parts 14.
[0062] The groove 11 is located near the first end of the outer shell 1, and its two ends are respectively connected to the first end face of the outer shell 1 and the interior of the outer shell 1. The groove 11 is a U-shaped groove. The groove wall of the U-shaped groove includes an arc surface and two parallel planes connected on both sides of the arc surface. The distance between the two planes should match the outer diameter of the interface 81. One of the limiting parts 14 can be part of the first end face of the outer shell 1, and the other limiting part 14 can be part of a corresponding partition 15 fixed inside the outer shell 1. The two limiting parts 14 are U-shaped and protrude from the groove wall of the groove 11. However, after the cylindrical interface 81 is inserted into the groove 11, the two limiting parts 14 can axially limit the two ends of the interface 81 to prevent the interface 81 from moving, which is more conducive to the connection between the needle 71 and the interface 81.
[0063] Further optionally, in order for the operator to observe whether the needle 71 has pierced the interface 81 and reached the appropriate position inside the liquid storage container 8, refer to Figure 1 and Figure 6 An opening 16 is provided on the bottom surface of the outer casing 1, directly opposite the mounting groove 51. The width of the opening 16 along the width direction of the outer casing 1 should be less than the width of the moving block 5 to prevent the moving block 5 from falling off. The first end of the opening 16 along the length direction of the outer casing 1 can connect to the aforementioned groove 11, so that the operator can observe the docking status of the needle 71 and the interface 81. Generally, the first end face or one side of the outer casing 1 is detachably connected to the main body of the outer casing 1 to facilitate the insertion of the moving block 5 on which the needle tube 7 is mounted.
[0064] The aforementioned second through hole 182 is located on the second end face of the outer shell 1 and is generally connected to the bottom surface of the outer shell 1. After the movable block 5 with the needle tube 7 installed is installed inside the outer shell 1, the second end of the needle tube 7 can pass through the second through hole 182. The second end of the opening 16 can be connected to the aforementioned second through hole 182 as needed. Generally, the length of the needle tube body 72 can be designed to be relatively long. The second end of the needle tube body 72 passes through the second through hole 182 and is connected to a flexible tube outside the outer shell 1 by a clamp, and then connected to the aseptic addition production line. Alternatively, the length of the needle tube body 72 can be designed to be relatively short. The end of the needle tube body 72 extending out of the connecting plate 74 is connected to a flexible tube by a clamp. The flexible tube passes through the second through hole 182 and is then connected to the aseptic addition production line.
[0065] Furthermore, in order to allow the moving block 5 to return to its initial position after the syringe 7 has finished adding material to the liquid storage container 8, refer to... Figure 3 , Figure 4 and Figure 12 The outer casing 1 is also provided with a push rod 6 that can extend and retract along the length of the movable block 5. A part of the push rod 6 extends into the outer casing 1 and can move toward the first end of the movable block 5 to lift the pawl 4 so that the locking block 41 is disengaged from the corresponding slot 52.
[0066] Specifically, the first end of the push rod 6 forms a baffle 61 with an increased diameter, the second end of the push rod 6 can move through the side wall of the outer casing 1 and extend into the interior of the outer casing 1, and a spring 62 is also sleeved on the push rod 6, the two ends of the spring 62 can respectively abut against and connect between the baffle 61 and the outer wall of the outer casing 1.
[0067] The push rod 6 is located on the second end face of the outer casing 1, with its length direction parallel to the length direction of the moving block 5. A third through hole is also provided on the second end face of the outer casing 1, through which the push rod 6 can pass. The second end of the push rod 6 can be directly facing the pawl 4. During the swinging of the pawl 4, the push rod 6 will not affect the movement of the pawl 4. When the moving block 5 needs to be reset, the push rod 6 is manually pressed, causing the push rod 6 to move towards the first end of the moving block 5. The push rod 6 can contact and push up the pawl 4, causing the moving block 5 to disengage from the limit of the locking block 41. At this time, the operator can move the moving block 5 through the opening 16 on the outer casing 1, or directly tilt the outer casing 1 to allow the moving block 5 to move under the action of gravity, so that the moving block 5 can return to the initial position. After returning to the initial position, the locking block 41 will once again lock into the corresponding slot 52.
[0068] In an optional example, a mounting cylinder 17 is also provided on the outer wall of the outer casing 1. Specifically, the mounting cylinder 17 is provided at a position opposite the third through hole on the outer side of the second end face of the outer casing 1. The axial direction of the mounting cylinder 17 is parallel to the length direction of the outer casing 1. One end of the mounting cylinder 17 is fixed to the end face of the outer casing 1, and the other end has a through hole. The diameter of the through hole is smaller than the outer diameter of the baffle 61 to limit the movement of the baffle 61. The first end of the push rod 6, the baffle 61, and the spring 62 are all installed inside the mounting cylinder 17. The two ends of the spring 62 can be in contact with the outer wall of the end face of the outer shell 1 and the top of the baffle 61 respectively. A button 63 is also provided on the connecting plate 74, which can be protruded through the through hole. The push rod 6, the baffle 61 and the button 63 can be integrally formed. By manually pressing the button 63, the push rod 6 can be moved inward to lift the pawl 4 so that the moving block 5 can move in the opposite direction and reset. When the operator releases the button 63, the push rod 6 can be automatically reset under the elastic force of the spring 62.
[0069] In another alternative example, the two ends of the spring 62 are fixedly connected to the second end face of the housing 1 and the connecting plate 74, respectively.
[0070] Furthermore, when used for material addition in the food production process, such as when adding live bacteria products, the outer shell 1, knob 2, rocker arm 3, pawl 4, locking block 41, moving block 5, push rod 6 and button 63 are all made of food-grade materials, such as PP material, and the aforementioned spring 62 is made of stainless steel.
[0071] Of course, the needle tube 7 snap-fit connection device mentioned above is not limited to material addition in the food production field. It is also applicable to any field that requires the needle tube 7 to pierce the liquid storage container 8 to add materials into the liquid storage container 8. It can achieve a stable and reliable connection between the needle tube 7 and the liquid storage container 8 and prevent the needle tube 7 from falling off during the material addition process.
[0072] The above are merely illustrative embodiments of this utility model and are not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.
Claims
1. A needle tube snap-fit connection device, characterized in that, The device includes a housing, a knob rotatably mounted outside the housing, and a rocker arm, a pawl, and a movable block inside the housing. The movable block is movable along the length of the housing. A groove is provided on the housing at a position opposite the first end of the movable block for engaging the interface of a liquid storage container. A mounting groove is provided on the bottom surface of the movable block, extending through both ends along its length, for engaging a needle tube. The needle tip of the needle tube can extend out of the first end of the movable block and face the interface. The second end of the needle tube can extend out of the second end of the movable block and protrude from the housing. Multiple slots are evenly spaced along the length of the top surface of the movable block. The knob is fixed to the first end of the rocker arm via a connecting rod that passes through the housing. The first end of the pawl is hinged to the second end of the rocker arm, and the second end of the pawl is provided with a locking block. The locking block can engage in the corresponding slot each time the rocker arm moves to the lowest position near the movable block. It can also push the movable block to move towards the interface when the rocker arm rotates towards the first end of the movable block, so that the needle can penetrate the interface and extend into the liquid storage container.
2. The needle tube snap-fit connection device as described in claim 1, characterized in that, The rocker arm includes a first rod and a second rod that are vertically fixed together. The first rod is fixed to the connecting rod, and the first end of the pawl is hinged to the second rod.
3. The needle tube snap-fit connection device as described in claim 1, characterized in that, The needle tube includes a needle tip and a needle tube body. The needle tip is connected to the first end of the needle tube body. A connecting ring is sleeved in the middle of the needle tube body. Two connecting plates are symmetrically arranged on both sides of the needle tube body near its second end. The ends of the connecting plates are connected to the connecting ring. The mounting groove includes a first limiting groove, a receiving groove, and a second limiting groove connected sequentially from the first end to the second end of the moving block. The second limiting groove is a rectangular groove. The first end of the needle tube body can be locked and limited in the first limiting groove. The connecting ring can be locked in the receiving groove. The two connecting plates can be locked and limited in the second limiting groove.
4. The needle tube snap-fit connection device as described in claim 1, characterized in that, The outer shell is a rectangular shell, and the movable block is a rectangular block. Two limiting plates are also provided inside the outer shell, which are spaced apart along its width direction. The length direction of the limiting plates extends along the length direction of the outer shell. The two limiting plates and the bottom surface of the outer shell enclose a rectangular cavity. The movable block is movably disposed in the rectangular cavity. The second end of the pawl can pass through the gap between the two limiting plates so that the locking block can be locked in the corresponding locking groove.
5. The needle tube snap-fit connection device as described in claim 4, characterized in that, Two limiting blocks are provided on the plate surface of the two limiting plates facing away from the moving block. The gap between the two limiting blocks is smaller than the interval between the two limiting plates. The second end of the pawl can swing through the gap between the two limiting blocks.
6. The needle tube snap-fit connection device as described in claim 1, characterized in that, The groove opening connects to the bottom surface of the outer shell, and the two ends of the groove along the length direction of the outer shell connect to the corresponding end face of the outer shell and the interior of the outer shell, respectively. Two limiting parts protruding from the groove wall are formed at both ends of the groove. The interface is a cylindrical structure, and the interface can be locked in the groove and the two ends of the interface can be axially limited between the two limiting parts.
7. The needle tube snap-fit connection device as described in claim 1, characterized in that, An opening is provided on the bottom surface of the housing, directly opposite the mounting groove.
8. The needle tube snap-fit connection device as described in claim 1, characterized in that, The housing is also provided with a push rod that can extend and retract along the length of the movable block. A portion of the push rod extends into the housing and can move toward the first end of the movable block to push up the pawl and disengage the locking block from the corresponding slot.
9. The needle tube snap-fit connection device as described in claim 8, characterized in that, The first end of the push rod forms a baffle with an increased diameter, and the second end of the push rod can move through the side wall of the housing and extend into the interior of the housing. A spring is also sleeved on the push rod, and the two ends of the spring can respectively abut against and connect between the baffle and the outer wall of the housing.
10. The needle tube snap-fit connection device as described in claim 1, characterized in that, The outer casing, the knob, the rocker arm, the pawl, the locking block, and the moving block are all made of food-grade materials.