Automatic locking device for biological tissue sections

Abstract

The utility model relates to biological tissue section technical field discloses a kind of biological tissue section automatic locking devices, including fixed seat, the inner wall front of fixed seat is fixedly connected with multiple evenly distributed locating pins, two inner side walls of fixed seat are all provided with two symmetrical L type reset slots, the inner wall of each L type reset slot close to reset port is fixedly connected with L type limiting frame, the device is locked by locating pin, L type clamping plate with L type rubber pad, match limiting pressing plate, second reset spring and trapezoidal stretching plate to realize paraffin, locating pin is stuck into paraffin preliminary positioning, trapezoidal stretching plate is pulled out, second reset spring pushes limiting pressing plate and limits it, prevent L type clamping plate early closure, it is convenient to place paraffin, when needing to be clamped, trapezoidal stretching plate is pushed in, its arc chamfer pushes limiting pressing plate and moves out, through stretching rod with L type clamping plate close, cooperate first reset spring and clamp paraffin, avoid paraffin to move when sectioning, guarantee sectioning uniform.

Description

Technical Field

[0001] This utility model relates to the field of biological tissue sectioning technology, and more specifically, to an automatic locking device for biological tissue sections. Background Technology

[0002] Pathological tissue sectioning is a key technical step in clinical pathological diagnosis and medical research. Among them, paraffin embedding has become the mainstream processing method in the industry because it can effectively solidify soft biological tissues and maintain cell morphology. This involves encapsulating and solidifying biological tissues with paraffin to form a paraffin tissue block with a certain degree of hardness. Then, a sectioning device is used to cut it into thin sections for observation and analysis. In existing sectioning devices, the method of fixing paraffin tissue blocks is relatively simple. Most of them have a slot on the fixation frame that is adapted to the size of the paraffin tissue block. The operator directly clamps the paraffin tissue block into the slot, and the initial positioning is achieved by relying solely on the friction between the slot and the tissue block. Subsequently, the height of the fixation frame needs to be adjusted by manually cranking the handle to adapt to the sectioning blade. However, the existing locking device acts on the fixation frame as a whole, rather than the paraffin tissue block itself.

[0003] However, this clamping and locking method has certain limitations in locking paraffin tissue blocks. On the one hand, the paraffin tissue block is positioned solely by the friction of the clamping slot, lacking a locking structure for the paraffin tissue block itself. During the sectioning process, the cutting force generated by the contact between the scalpel and the tissue block, as well as the slight vibration of the device, can easily cause the paraffin tissue block to shift slightly within the clamping slot (such as moving back and forth or the edges lifting), resulting in uneven section thickness or even tissue morphology defects, affecting the accuracy of pathological observation. On the other hand, when processing paraffin tissue blocks of different sizes, the clamping slot cannot be adapted, requiring the replacement of a special clamping slot, further increasing the complexity and cost of operation, and making it difficult to meet diverse sectioning needs. Utility Model Content

[0004] (a) Technical problems to be solved In view of the above situation and to overcome the defects of the prior art, this utility model provides an automatic locking device for biological tissue slices, which aims to solve the problems in the background art.

[0005] (II) Technical Solution To achieve the above objectives, this application provides the following technical solution: an automatic locking device for biological tissue sections, comprising a fixing base, wherein a plurality of evenly distributed positioning pins are fixedly connected to the front of the inner wall of the fixing base, and two symmetrical L-shaped reset grooves are formed on the two inner side walls of the fixing base. An L-shaped limiting frame is fixedly connected to the inner wall of each L-shaped reset groove near the reset port, and an L-shaped clamping plate is engaged inside each L-shaped limiting plate. An L-shaped limiting plate is fixedly connected to the side of each L-shaped clamping plate away from the reset port, and three first reset springs are fixedly connected to the side of each L-shaped limiting plate away from the reset port together with the inner side wall of the L-shaped reset groove. Two tension rods are fixedly connected to one side of each fixed base. A trapezoidal tension plate is fixedly connected to the end of every four tension rods away from the fixed base. Four limiting rods are fixedly connected to the left and right sides of the fixed base. Two positioning plates are fixedly connected to the left and right sides of the fixed base outside the two inclined sides of the trapezoidal tension plate. Two telescopic sleeves are fixedly connected to the side of each positioning plate near the inclined side of the trapezoidal tension plate. A telescopic sleeve rod is slidably connected inside each telescopic sleeve. A second return spring is fixedly connected to the inner wall of each telescopic sleeve at the end inside the telescopic sleeve. A limit pressure plate is fixedly connected to the end of every two telescopic sleeve rods near the inclined side of the trapezoidal tension plate.

[0006] The present invention is further configured such that the end of each tension rod away from the L-shaped limiting plate extends to the outside of the fixed base, the side of the two trapezoidal tension plates close to each other contacts the left and right sides of the fixed base, the four limiting rods are all located inside the trapezoidal tension plates, the outer surface of each limiting rod is slidably connected to the inside of the trapezoidal tension plate, the side of each limiting pressure plate close to the inclined side of the trapezoidal tension plate abuts against the inclined side surface of the trapezoidal tension plate, and the two inclined sides of each trapezoidal tension plate and the side of the limiting pressure plate close to the inclined side of the trapezoidal tension plate are all arc-shaped chamfers.

[0007] The present invention is further configured such that an L-shaped rubber pad is fixedly connected to one side of each of the four L-shaped clamping plates that are close to each other, and the end of each L-shaped rubber pad that is away from the L-shaped clamping plate extends into the interior of the L-shaped reset groove.

[0008] The present invention is further configured such that three limiting grooves are provided on the inner sidewall of each L-shaped reset groove, and a stabilizing slide plate is slidably connected inside each limiting groove, and the outer surface of each stabilizing slide plate is fixedly connected to the outer surface of the L-shaped limiting plate.

[0009] The present invention is further configured such that an auxiliary handle is provided on the outer side of each trapezoidal stretching plate, the outer surface of each auxiliary handle is fixedly connected to the outer surface of the trapezoidal stretching plate, and each trapezoidal stretching plate is located in the middle of the four limiting rods.

[0010] The present invention is further configured such that four oblique sliding grooves are provided on the inner walls of the limiting pressure plates on both the left and right sides of the fixed base, and the two protruding ends of each limiting pressure plate near the fixed base are slidably connected to the interior of two corresponding oblique sliding grooves.

[0011] (III) Beneficial Effects Compared with the prior art, the beneficial effects of this utility model are: 1. The positioning pins on the inner wall of the fixed base, the L-shaped clamping plate with L-shaped rubber pads, the limiting pressure plate, the second return spring, and the trapezoidal stretching plate allow the positioning pins to penetrate the paraffin tissue block for initial positioning. When the trapezoidal stretching plate is stretched outward, the second return spring pushes the limiting pressure plate to move to the inside of the trapezoidal stretching plate to limit it, preventing the trapezoidal stretching plate from moving back on its own and causing the L-shaped clamping plate to close prematurely. This ensures that the operator has sufficient time to place the paraffin and prevents the clamping structure from loosening during placement, which would affect positioning. When it is necessary to clamp and push the trapezoidal stretching plate inward, its oblique side pushes the limiting pressure plate outward through the arc-shaped chamfer. At the same time, the stretching rod drives the L-shaped clamping plate to move towards the center, which, together with the elastic force of the first return spring, forms a ring-shaped clamping on the paraffin, directly locking the paraffin itself and preventing the paraffin from shifting or lifting due to cutting force and vibration during sectioning, thus ensuring uniform section thickness. 2. Through the elastic limiting of the limiting pressure plate and the second return spring, and the cooperation of the trapezoidal tension plate and the tension rod, the opening and closing action of the L-shaped clamping plate can be stably ensured by the dynamic limiting of the limiting pressure plate during the movement of the trapezoidal tension plate. At the same time, the adjustable opening range of the L-shaped clamping plate can be used to adapt to different sizes of paraffin wax without replacing special parts. With the help of positioning, the initial positioning of the paraffin wax is achieved, avoiding the problem of frequent frame replacement due to the inability of the slot to adapt in the existing technology. This reduces the complexity and cost of operation. At the same time, the L-shaped rubber pad can increase the friction with the paraffin wax and buffer the clamping force to prevent the paraffin wax from being pinched or broken, further improving the locking reliability and the integrity of the paraffin wax. Attached Figure Description

[0012] Figure 1 This is a three-dimensional overall structural diagram of the present invention; Figure 2 This is a cross-sectional perspective view of the fixing base of this utility model; Figure 3 This is a three-dimensional structural diagram of the L-shaped reset groove of this utility model; Figure 4 This is a three-dimensional sectional view of the telescopic sleeve of this utility model; Figure 5 This is a three-dimensional structural diagram of the L-shaped clamping plate of this utility model.

[0013] In the diagram: 1. Fixed base; 2. Limiting pressure plate; 3. Positioning plate; 4. Limiting rod; 5. Auxiliary handle; 6. Telescopic sleeve; 7. Trapezoidal tension plate; 8. Positioning pin; 9. L-shaped rubber pad; 10. First return spring; 11. L-shaped limiting plate; 12. Stabilizing slide plate; 13. L-shaped limiting frame; 14. Tensioning rod; 15. L-shaped return groove; 16. Inclined slide groove; 17. Limiting groove; 18. Telescopic sleeve rod; 19. Second return spring; 20. L-shaped clamping plate. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0016] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0017] Please see Figures 1-5The system includes a fixed base 1. Multiple evenly distributed positioning pins 8 are fixedly connected to the front inner wall of the fixed base 1. Two symmetrical L-shaped reset grooves 15 are formed on each of the two inner side walls of the fixed base 1. An L-shaped limiting frame 13 is fixedly connected to the inner wall of each L-shaped reset groove 15 near the reset port. An L-shaped clamping plate 20 is snapped into the interior of each L-shaped clamping plate 20. An L-shaped limiting plate 11 is fixedly connected to the side of each L-shaped clamping plate 20 away from the reset port. Three first reset springs 10 are fixedly connected to the side of each L-shaped limiting plate 11 away from the reset port, together with the inner side wall of the L-shaped reset groove 15. Two tension rods 14 are fixedly connected to the side of each L-shaped limiting plate 11 away from the reset port. The ends of the four tension rods 14 away from the fixed base 1 are all fixedly connected to a trapezoidal tension plate 7. The left and right sides of the fixed base 1 are all fixedly connected to four limiting rods 4. The left and right sides of the fixed base 1 are all fixedly connected to two positioning plates 3 on the outer sides of the two inclined sides of the trapezoidal tension plate 7. The side of each positioning plate 3 near the inclined side of the trapezoidal tension plate 7 is fixedly connected to two telescopic sleeves 6. The inside of each telescopic sleeve 6 is slidably connected to a telescopic sleeve rod 18. The end of each telescopic sleeve rod 18 inside the telescopic sleeve 6 is fixedly connected to a second return spring 19 together with the inner wall of the telescopic sleeve 6. The ends of every two telescopic sleeve rods 18 near the inclined side of the trapezoidal tension plate 7 are all fixedly connected to a limiting pressure plate 2.

[0018] Specifically, the fixing seat 1 facilitates the clamping and fixing of the paraffin tissue block. The positioning pin 8 on the front of its inner wall can be inserted into the paraffin tissue block for initial positioning. The L-shaped reset groove 15 on the inner side wall of the fixing seat 1 provides a moving track for the L-shaped clamping plate 20. The L-shaped limiting frame 13 clamps the L-shaped clamping plate 20 to prevent it from disengaging from the L-shaped reset groove 15. The L-shaped clamping plate 20 is fixed to the L-shaped limiting plate 11. The L-shaped limiting plate 11 is connected to the inner wall of the L-shaped reset groove 15 through the first reset spring 10. Next, when the trapezoidal stretching plate 7 is stretched outward, it will drive the L-shaped limiting plate 11 to move synchronously through the stretching rod 14, causing the L-shaped clamping plate 20 to open in the L-shaped reset groove 15. At the same time, the first reset spring 10 is compressed. At this time, the second reset spring 19 in the telescopic sleeve 6 on the side positioning plate 3 of the fixed seat 1 will release its elastic force to push the telescopic sleeve rod 18, thereby driving the limiting pressure plate 2 to move into the internal space between the trapezoidal stretching plate 7 and the side of the fixed seat 1, so that the limiting pressure plate 2 and the trapezoidal stretching plate 7 are in contact with the trapezoidal clamping plate 15. The inclined edge of the trapezoidal stretching plate 7 tightly abuts against the outside, effectively limiting the outward stretching of the trapezoidal stretching plate 7 and preventing it from moving back under the reaction force of the first return spring 10. This ensures that the L-shaped clamping plate 20 remains open, providing sufficient space for the operator to place the paraffin tissue block and avoiding the impact of premature closure of the clamping plate on the placement of the paraffin. When clamping is required, the trapezoidal stretching plate 7 is pushed inward. The trapezoidal stretching plate 7 can squeeze the limiting pressure plate 2 outward through its arc edge, causing the limiting pressure plate 2 to drive the telescopic sleeve 18 to compress the second return spring 19 and move outward. At the same time, the first return spring 10 pushes the L-shaped clamping plate 20 towards the center to clamp the paraffin. The limiting rod 4 limits the direction of movement of the trapezoidal stretching plate 7 to prevent it from deviating and directly locks the paraffin tissue block. This solves the problem in the prior art where only the locking and fixing frame is used, which leads to easy deviation of the paraffin and easy loosening of the fixing structure when placing the paraffin. This ensures the accuracy of subsequent clamping and positioning and the stable clamping of the paraffin tissue block.

[0019] Please see Figures 1-5 Each tension rod 14 extends to the outside of the fixed base 1 at one end away from the L-shaped limiting plate 11. The two trapezoidal tension plates 7 are in contact with the left and right sides of the fixed base 1 on their sides. The four limiting rods 4 are located inside the trapezoidal tension plates 7. The outer surface of each limiting rod 4 is slidably connected to the inside of the trapezoidal tension plate 7. The side of each limiting pressure plate 2 near the inclined side of the trapezoidal tension plate 7 is in contact with the inclined side surface of the trapezoidal tension plate 7. The two inclined sides of each trapezoidal tension plate 7 and the side of the limiting pressure plate 2 near the inclined side of the trapezoidal tension plate 7 are all arc-shaped chamfers.

[0020] Specifically, the tension rod 14 passes through the outside of the fixed base 1, allowing the trapezoidal tension plate 7 to move outside the fixed base 1, driving the tension rod 14 to move. The trapezoidal tension plate 7 contacts the side of the fixed base 1, ensuring stability during movement. The limiting rod 4 is located inside the trapezoidal tension plate 7 and is slidably connected to it, further limiting the movement trajectory of the trapezoidal tension plate 7 and preventing lateral deviation. The limiting pressure plate 2 abuts against the inclined side of the trapezoidal tension plate 7, and both contact sides have arc-shaped chamfers. When the trapezoidal tension plate 7 is pushed inward, the arc-shaped chamfers reduce the frictional resistance between them, allowing the trapezoidal tension plate 7 to smoothly push the limiting pressure plate 2 to move, ensuring that the L-shaped clamping plate 20 can stably move towards the center to clamp the paraffin, solving the problem of the trapezoidal tension plate 7 getting stuck or the limiting failure, and improving the ease of operation and clamping stability.

[0021] Please see Figures 1-5 Each of the four L-shaped clamping plates 20 has an L-shaped rubber pad 9 fixedly connected to one side of each other. The end of each L-shaped rubber pad 9 away from the L-shaped clamping plate 20 extends into the interior of the L-shaped reset groove 15.

[0022] Specifically, by fixing an L-shaped rubber pad 9 to one side of the L-shaped clamping plates 20 that are close to each other, and having the end of the L-shaped rubber pad 9 away from the L-shaped clamping plates 20 penetrate into the L-shaped reset groove 15, when the L-shaped clamping plates 20 clamp the paraffin tissue block, the L-shaped rubber pad 9 directly contacts the surface of the paraffin tissue block. Its elastic properties can buffer the clamping force of the L-shaped clamping plates 20, preventing the paraffin tissue block from breaking due to excessive clamping force. At the same time, the coefficient of friction of the surface of the L-shaped rubber pad 9 is greater than that of the metal surface, which can increase the friction between the surface and the paraffin tissue block, preventing the paraffin tissue block from slipping during clamping. This solves the problem that existing metal clamping plates easily damage paraffin or cause paraffin to slip, ensuring the integrity and clamping firmness of the paraffin tissue block.

[0023] Please see Figures 1-5 Each L-shaped reset groove 15 has three limiting grooves 17 on its inner sidewall. Each limiting groove 17 has a slidably connected stabilizing slide plate 12 inside. The outer surface of each stabilizing slide plate 12 is fixedly connected to the outer surface of the L-shaped limiting plate 11. Each trapezoidal tension plate 7 has an auxiliary pull handle 5 on its outer side. The outer surface of each auxiliary pull handle 5 is fixedly connected to the outer surface of the trapezoidal tension plate 7. Each trapezoidal tension plate 7 is located in the middle of the four limiting rods 4.

[0024] Specifically, by opening three limiting grooves 17 on the inner sidewall of the L-shaped reset groove 15, the stabilizing slide plate 12 is slidably connected inside the limiting grooves 17 and fixedly connected to the outer surface of the L-shaped limiting plate 11. When the L-shaped limiting plate 11 moves with the tension rod 14, the stabilizing slide plate 12 will slide synchronously along the limiting grooves 17. The limiting grooves 17 can limit the movement direction of the stabilizing slide plate 12, thereby ensuring that the L-shaped limiting plate 11 and the L-shaped clamping plate 20 do not deviate when moving, improving the clamping accuracy. The auxiliary pull handle 5 on the outside of the trapezoidal tension plate 7 makes it convenient for the operator to pull the trapezoidal tension plate 7, reducing the difficulty of operation. Moreover, the trapezoidal tension plate 7 is located in the middle of the four limiting rods 4, so that the trapezoidal tension plate 7 is evenly stressed, avoiding tilting or damage due to uneven stress. This solves the problems of L-shaped clamping plate 20 movement deviation, inconvenient operation, or easy damage to the trapezoidal tension plate 7, and extends the service life of the device.

[0025] Please see Figures 1-5 The left and right sides of the fixed base 1 are provided with four inclined sliding grooves 16 on the inner wall of the limiting pressure plate 2. The two protruding ends of each limiting pressure plate 2 near the fixed base 1 are slidably connected to the interior of two corresponding inclined sliding grooves 16.

[0026] Specifically, four inclined grooves 16 are opened on the left and right sides of the fixed base 1 at the position of the inner wall of the limiting pressure plate 2. The two protruding ends of the limiting pressure plate 2 near the fixed base 1 are slidably connected to the corresponding inclined grooves 16. When the limiting pressure plate 2 is pushed and moved by the trapezoidal tension plate 7, its protruding ends will slide along the inclined grooves 16. The inclined grooves 16 can limit the movement trajectory of the limiting pressure plate 2, prevent the limiting pressure plate 2 from deviating or tilting when moving, ensure that the limiting pressure plate 2 is always in stable contact with the inclined side of the trapezoidal tension plate 7, ensure the limiting effect of the trapezoidal tension plate 7, solve the problem of limiting failure caused by the movement deviation of the limiting pressure plate 2, and further improve the reliability of the device in locking the paraffin tissue block.

[0027] Working principle: In use, firstly, the trapezoidal stretching plate 7 is stretched outward. The trapezoidal stretching plate 7 drives the L-shaped limiting plate 11 to move synchronously through the stretching rod 14, causing the L-shaped clamping plate 20 to open in the L-shaped reset groove 15 on the inner wall of the fixed seat 1. At the same time, the first reset spring 10 between the L-shaped limiting plate 11 and the inner wall of the L-shaped reset groove 15 is compressed. At this time, the second reset spring 19 in the telescopic sleeve 6 on the side positioning plate 3 of the fixed seat 1 releases its elastic force to push the telescopic sleeve rod 18, causing the limiting pressure plate 2 to move to the internal space between the trapezoidal stretching plate 7 and the side of the fixed seat 1, and to closely abut against the inclined side of the trapezoidal stretching plate 7, forming an effective limit on the stretched trapezoidal stretching plate 7, preventing it from moving back on its own under the reaction force of the first reset spring 10, and ensuring that the L-shaped clamping plate 20 remains in the open state. Then, the paraffin tissue block is placed into the fixed seat 1, so that the positioning pin 8 on the front of the inner wall of the fixed seat 1 is inserted into the paraffin tissue block to achieve initial positioning. Then, the trapezoidal stretching plate 7 is pushed inward to move the trapezoidal stretching plate 7 inward. The stretching plate 7 presses the limiting pressure plate 2 outward through its arc-shaped edge, causing the limiting pressure plate 2 to drive the telescopic sleeve rod 18 to compress the second return spring 19 and move outward. At the same time, the first return spring 10 returns to its original position, pushing the L-shaped limiting plate 11 and the L-shaped clamping plate 20 towards the center. The L-shaped rubber pad 9 on one side of the L-shaped clamping plate 20 comes into contact with the paraffin tissue block, forming a stable clamping effect on the paraffin tissue block. During this process, the limiting rods 4 on both sides of the fixing seat 1 limit the movement direction of the trapezoidal stretching plate 7. The stabilizing slide plate 12 in the limiting groove 17 on the inner side wall of the reset groove 15 slides synchronously with the L-shaped limiting plate 11 to ensure that the L-shaped clamping plate 20 does not deviate. The protruding end of the limiting pressure plate 2, which is slidably connected in the inclined sliding groove 16 on both sides of the fixing seat 1, moves along the inclined sliding groove 16 to ensure that the limiting pressure plate 2 moves stably. The L-shaped limiting frame 13 prevents the L-shaped clamping plate 20 from disengaging from the L-shaped reset groove 15, thus achieving reliable locking of the paraffin tissue block, avoiding the deviation of the paraffin tissue block during the sectioning process, and ensuring the sectioning accuracy.

[0028] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic locking device for biological tissue slices, comprising a fixing base (1), characterized in that: The inner wall of the fixed base (1) is fixedly connected with a plurality of evenly distributed positioning pins (8). The two inner side walls of the fixed base (1) each have two symmetrical L-shaped reset grooves (15). Each L-shaped reset groove (15) is fixedly connected with an L-shaped limiting frame (13) on the inner wall near the reset port. Each L-shaped limiting frame (13) is fitted with an L-shaped clamping plate (20). Each L-shaped clamping plate (20) is fixedly connected with an L-shaped limiting plate (11) on the side away from the reset port. Each L-shaped limiting plate (11) on the side away from the reset port and the inner side wall of the L-shaped reset groove (15) are fixedly connected with three first reset springs (10). Each L-shaped limiting plate (11) on the side away from the reset port is fixedly connected with two tension rods (14). Every four tension rods (14) are fixedly connected to each other. 4) A trapezoidal tension plate (7) is fixedly connected to the end away from the fixed seat (1). Four limiting rods (4) are fixedly connected to the left and right sides of the fixed seat (1). Two positioning plates (3) are fixedly connected to the left and right sides of the fixed seat (1) on the outside of the two inclined sides of the trapezoidal tension plate (7). Two telescopic sleeves (6) are fixedly connected to the side of each positioning plate (3) near the inclined side of the trapezoidal tension plate (7). A telescopic sleeve rod (18) is slidably connected inside each telescopic sleeve (6). A second return spring (19) is fixedly connected to the inner wall of each telescopic sleeve rod (6) at the end inside the telescopic sleeve (6). A limiting pressure plate (2) is fixedly connected to the end of each pair of telescopic sleeve rods (18) near the inclined side of the trapezoidal tension plate (7).

2. The automatic locking device for biological tissue sections according to claim 1, characterized in that: Each of the tension rods (14) extends to the outside of the fixed seat (1) at the end away from the L-shaped limiting plate (11). The two trapezoidal tension plates (7) are close to each other on one side and are in contact with the left and right sides of the fixed seat (1). The four limiting rods (4) are located inside the trapezoidal tension plate (7). The outer surface of each limiting rod (4) is slidably connected to the inside of the trapezoidal tension plate (7). The side of each limiting pressure plate (2) close to the inclined side of the trapezoidal tension plate (7) is in contact with the inclined side surface of the trapezoidal tension plate (7). The two inclined sides of each trapezoidal tension plate (7) and the side of the limiting pressure plate (2) close to the inclined side of the trapezoidal tension plate (7) are all arc-shaped chamfers.

3. The automatic locking device for biological tissue sections according to claim 1, characterized in that: Each of the four L-shaped clamping plates (20) has an L-shaped rubber pad (9) fixedly connected to one side of each L-shaped clamping plate (20), and the end of each L-shaped rubber pad (9) away from the L-shaped clamping plate (20) extends into the interior of the L-shaped reset groove (15).

4. The automatic locking device for biological tissue sections according to claim 1, characterized in that: Each L-shaped reset groove (15) has three limiting grooves (17) on its inner sidewall. Each limiting groove (17) has a slidably connected plate (12) inside it. The outer surface of each slidably connected plate (12) is fixedly connected to the outer surface of the L-shaped limiting plate (11).

5. The automatic locking device for biological tissue sections according to claim 1, characterized in that: Each of the trapezoidal stretch plates (7) is provided with an auxiliary handle (5) on its outer side. The outer surface of each auxiliary handle (5) is fixedly connected to the outer surface of the trapezoidal stretch plate (7). Each trapezoidal stretch plate (7) is located in the middle of the four limiting rods (4).

6. The automatic locking device for biological tissue sections according to claim 1, characterized in that: The left and right sides of the fixed base (1) are provided with four inclined sliding grooves (16) on the inner wall of the limiting pressure plate (2). The two protruding ends of each limiting pressure plate (2) near the fixed base (1) are slidably connected to the interior of two corresponding inclined sliding grooves (16).

Images