Anti-springback mechanism of centrifugal needle cylinder

Abstract

The utility model discloses an anti-springback mechanism of a centrifugal needle cylinder, which ensures that a sample is stable in a sample suction process, avoids mixing or overflowing caused by springback, and improves the accuracy and efficiency of an experiment. The anti-rebound mechanism of the centrifugal needle cylinder comprises a cylinder body, a core rod, a piston and a lock catch ring, one end of the core rod is connected with the piston and is movably inserted into the cylinder body; the periphery of the end, where the core rod is inserted, of the barrel protrudes in the radial direction of the barrel to form a limiting protrusion. The lock catch ring is arranged on the circumferential face of the core rod in a sleeving mode and matched with the end face of the end, and a clamping hook buckled on the limiting protrusion in a hooking mode is arranged on the lock catch ring. A plurality of clamping teeth evenly distributed in the axial direction of the core rod are arranged on the circumferential face of the core rod, the clamping teeth are opposite to the clamping hooks in direction, and the clamping teeth are movably buckled on the inner side of the lock catch ring in a hooked mode.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal technology, and specifically refers to an anti-rebound mechanism for a centrifugal syringe. Background Technology

[0002] Centrifugation is a technique that utilizes the rapid rotation of a centrifuge to separate, concentrate, and analyze different components in a sample due to differences in sedimentation rate or density under centrifugal force. It is widely used in many fields, including biology, medicine, chemistry, and food science. For example, in biology, it can be used to separate biological macromolecules such as cells, organelles, and proteins; in medical testing, it is used to separate blood components. Different types of centrifuges, such as low-speed centrifuges, high-speed centrifuges, and ultracentrifuges, are suitable for different centrifugation needs.

[0003] In current technical practice, syringes are typically used to aspirate samples and place them into centrifuge tubes. However, during sample aspiration, the syringe plunger is prone to rebound due to negative pressure at the sample end, which may cause sample mixing or spillage, thus affecting experimental results. Utility Model Content

[0004] The main purpose of this invention is to provide an anti-rebound mechanism for centrifugal syringes, which solves the problems existing in the prior art, ensures the stability of the sample during sample aspiration, avoids mixing or overflow caused by rebound, and improves experimental accuracy and efficiency.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A rebound prevention mechanism for a centrifugal syringe includes a syringe body, a core rod, a piston, and a locking ring. One end of the core rod is connected to the piston and is movably inserted into the syringe body. The periphery of the end of the syringe body into which the core rod is inserted protrudes radially to form a limiting protrusion. The locking ring is sleeved on the circumferential surface of the core rod and fits onto the end face of the core rod, and has a hook that hooks onto the limiting protrusion. The circumferential surface of the core rod has a plurality of teeth evenly distributed along its axial direction, the teeth being opposite in direction to the hooks and movably hooking onto the inner side of the locking ring.

[0007] The core rod has a four-sided member with a cross-shaped cross section between its two ends, and the four edges of the core rod are provided with the retaining teeth.

[0008] The limiting protrusion forms a ring connected end to end on the circumference of the cylinder and has two parallel planes. The locking ring is provided with a pair of hooks, which hook onto the lower surface of the limiting protrusion and fit against the planes.

[0009] The inner ring surface of the locking ring matches the profile of the locking teeth of the core rod, and the inner ring surface of the locking ring is provided with a clearance notch to accommodate the locking teeth.

[0010] Preferably, the junction between the clearance notch and the inner ring surface of the locking ring is provided with a rounded corner.

[0011] Preferably, the upper surfaces on both sides of the clearance notch are provided with guide slopes.

[0012] One end of the core rod is provided with a connecting part for connecting to the piston, and the other end is provided with a pressure plate.

[0013] Preferably, the surface of the pressure plate is provided with anti-slip texture.

[0014] After adopting the above technical solution, the present invention has the following technical effects:

[0015] This invention features a locking ring installed on the end face of the cylinder, with hooks on the circumference of the core rod engaging with the locking ring. The locking ring, through its hooks and the limiting protrusions of the cylinder, maintains a relatively fixed position of the core rod in the direction of separation from the cylinder. The core rod, in turn, is maintained relatively fixed in the direction of insertion into the cylinder by the hooks. This achieves relative fixation between the core rod and the cylinder, specifically preventing movement along the cylinder's axial direction. This ensures the piston's position, preventing displacement during sample aspiration and avoiding mixing or overflow caused by rebound, thus improving experimental accuracy and efficiency. Attached Figure Description

[0016] Figure 1 This is a perspective view of a specific embodiment of the present utility model.

[0017] Figure 2 Breakdown of specific embodiments of this utility model Figure 1 .

[0018] Figure 3 Breakdown of specific embodiments of this utility model Figure 2 .

[0019] Figure 4 This is a perspective view of the locking ring according to a specific embodiment of the present utility model.

[0020] Figure 5 This is a cross-sectional view of a specific embodiment of the present utility model.

[0021] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0022] Explanation of icon numbers:

[0023] 1-Cylinder body; 11-Limiting protrusion; 12-Flat surface;

[0024] 2-Core rod; 21-Clamping tooth; 22-Edge; 23-Connecting part; 24-Pressure plate; 25-Anti-slip texture;

[0025] 3-Piston;

[0026] 4-Lock ring; 41-Hook; 42-Leaning notch; 43-Rounded corner. Detailed Implementation

[0027] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0028] refer to Figure 1-6 As shown, this utility model discloses an anti-rebound mechanism for a centrifugal syringe, including a syringe body 1, a core rod 2, a piston 3, and a locking ring 4;

[0029] One end of the core rod 2 is connected to the piston 3 and can be movably inserted into the cylinder 1;

[0030] The end of the cylinder 1 into which the core rod 2 is inserted protrudes radially to form a limiting protrusion 11; the locking ring 4 is sleeved on the circumferential surface of the core rod 2 and fits on the end face of the end, and a hook 41 is provided on it to hook onto the limiting protrusion 11.

[0031] The core rod 2 has several teeth 21 evenly distributed along its own axis on its circumferential surface. The teeth 21 are opposite in direction to the hooks 41 and are movably hooked onto the inside of the locking ring 4.

[0032] Through the above solution, this utility model installs a locking ring 4 on the end face of the cylinder 1, and the circumferential surface of the core rod 2 has a locking tooth 21 that hooks onto the locking ring 4. Since the locking ring 4 is kept relatively fixed to the cylinder 1 in the direction in which the core rod 2 is separated from the cylinder 1 by its locking hook 41 and the limiting protrusion 11 of the cylinder 1, and the core rod 2 is kept relatively fixed in the direction in which the core rod 2 is inserted into the cylinder 1 by the locking tooth 21, the core rod 2 and the cylinder 1 are finally relatively fixed, specifically, they cannot move in the axial direction of the cylinder 1. This ensures the position of the piston 3, ensures that the piston 3 does not move during the sample aspiration process, avoids mixing or overflow caused by rebound, and improves the accuracy and efficiency of the experiment.

[0033] The following are specific embodiments of the present invention.

[0034] The core rod 2 has a four-sided member with a cross-shaped cross section between its two ends, and each of the four edges 22 of the core rod 2 is provided with a locking tooth 21.

[0035] The aforementioned limiting protrusion 11 forms a ring connected end to end on the circumference of the cylinder 1, and has two parallel planes 12. A pair of hooks 41 are provided on the locking ring 4. The hooks 41 hook onto the lower surface of the limiting protrusion 11 and fit against the plane 12, which can prevent the locking ring 4 from rotating.

[0036] The inner ring surface of the aforementioned locking ring 4 matches the contour of the locking teeth 21 of the core rod 2, so that the locking teeth 21 will not wobble after hooking onto the inner side of the locking ring 4; at the same time, the inner ring surface of the locking ring 4 is provided with a clearance notch 42 for the clearance teeth 21. When the core rod 2 is rotated to align its locking teeth 21 with the clearance notch 42, the core rod 2 can be pushed and pulled to generate axial movement relative to the cylinder 1. Obviously, when the core rod 2 is a quadrangular piece with a cross section, the clearance notches 42 are arranged at equal angular intervals around the axis of the locking ring 4.

[0037] Furthermore, a rounded corner 43 is provided at the connection between the aforementioned clearance notch 42 and the inner ring surface of the locking ring 4.

[0038] Meanwhile, the upper surfaces on both sides of the aforementioned clearance notch 42 are provided with guide slopes 44, making it easier for the recessed part of the locking tooth 21 to engage with the locking ring 4.

[0039] One end of the core rod 2 is provided with a connecting part 23 for connecting to the piston 3, and the other end is provided with a pressure plate 24 for pushing and pulling the core rod.

[0040] Furthermore, the surface of the aforementioned pressure plate 24 is provided with anti-slip texture 25.

[0041] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A mechanism for preventing rebound of a centrifugal syringe, characterized in that: Includes the cylinder, core rod, piston, and locking ring; One end of the core rod is connected to the piston and can be movably inserted into the cylinder; The end of the cylinder into which the core rod is inserted protrudes radially to form a limiting protrusion; the locking ring is sleeved on the circumferential surface of the core rod and fits on the end face of the end, and is provided with a hook that hooks onto the limiting protrusion. The core rod has several teeth evenly distributed along its own axis on its circumferential surface. The teeth are opposite in direction to the hooks and are movably hooked onto the inside of the locking ring.

2. The anti-rebound mechanism of the centrifugal syringe as described in claim 1, characterized in that: The core rod has a four-sided member with a cross-shaped cross section between its two ends, and the four edges of the core rod are provided with the retaining teeth.

3. The anti-rebound mechanism of the centrifugal syringe as described in claim 1, characterized in that: The limiting protrusion forms a ring connected end to end on the circumference of the cylinder and has two parallel planes. The locking ring is provided with a pair of hooks, which hook onto the lower surface of the limiting protrusion and fit against the planes.

4. The anti-rebound mechanism of the centrifugal syringe as described in claim 1, characterized in that: The inner ring surface of the locking ring matches the profile of the locking teeth of the core rod, and the inner ring surface of the locking ring is provided with a clearance notch to accommodate the locking teeth.

5. The anti-rebound mechanism of the centrifugal syringe as described in claim 4, characterized in that: The junction between the clearance notch and the inner ring surface of the locking ring is provided with a rounded corner.

6. The anti-rebound mechanism of the centrifugal syringe as described in claim 4, characterized in that: The upper surfaces on both sides of the clearance notch are provided with guide slopes.

7. The anti-rebound mechanism of the centrifugal syringe as described in claim 1, characterized in that: One end of the core rod is provided with a connecting part for connecting to the piston, and the other end is provided with a pressure plate.

8. The anti-rebound mechanism of the centrifugal syringe as described in claim 7, characterized in that: The surface of the pressure plate is provided with anti-slip texture.

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