Intubation tube clamp

Abstract

A pipe inserting clamp comprises two plastic pipe clamping jaws and a clamping jaw opening and closing mechanism capable of driving the two plastic pipe clamping jaws to clamp or separate, and is characterized in that movable block guide structures extending in the inside and outside direction are arranged on the plastic pipe clamping jaws, and movable blocks capable of moving along the movable block guide structures are installed on the movable block guide structures; first limiting grooves are formed in the inner side faces of the movable blocks, and elastic telescopic devices capable of enabling the movable blocks to tend to move inwards are arranged on the plastic pipe clamping jaws. When the two plastic pipe clamping jaws clamp the plastic pipe, the two plastic pipe clamping jaws clamp the plastic pipe, and the two movable blocks clamp the end of the plastic pipe. The pipe inserting clamp can calibrate and position the position of the plastic pipe end, and position deviation of the plastic pipe end is effectively avoided.

Description

Technical Field

[0001] This utility model relates to a clamping device, specifically a tube clamp. Background Technology

[0002] The applicant's prior application, CN202321410734.8, discloses a tube expansion and insertion mechanism for an intubation machine (publication number CN220114001U). The tube expansion and insertion mechanism includes a plastic tube position switching mechanism and a plastic tube clamping mechanism (i.e., tube clamping hand) capable of holding the plastic tube. The plastic tube clamping mechanism clamps the plastic tube to be connected at a predetermined position. The clamping position of the plastic tube clamping mechanism on the plastic tube is close to the part of the tube to be expanded, usually at a short distance from the end of the plastic tube. Driven by the plastic tube position switching mechanism, the plastic tube clamping mechanism and the plastic tube on it move sequentially between the plastic tube positioning mechanism, the tube flaring mechanism, and the tube fitting positioning mechanism. Specifically, the plastic tube clamping mechanism first reaches the position of the plastic tube positioning mechanism, clamps the plastic tube on the plastic tube positioning mechanism, and removes it from the plastic tube positioning mechanism; then the plastic tube is transferred to the tube flaring mechanism, which performs tube flaring operation on the tube end; after the tube flaring mechanism completes the tube flaring operation, the plastic tube with the flared end is removed from the tube flaring mechanism; then the plastic tube is transferred so that the tube end is aligned with the position of the tube fitting to be connected on the tube fitting positioning mechanism, and then the plastic tube end is fitted onto the tube fitting, thereby realizing the connection between the plastic tube end and the tube fitting; after the connection between the plastic tube end and the tube fitting is completed, the plastic tube clamping mechanism releases the plastic tube and, driven by the plastic tube position switching mechanism, returns to the position of the plastic tube positioning mechanism to begin the next round of tube flaring and insertion operations. Typically, after the plastic tube clamping mechanism clamps the plastic tube on the plastic tube positioning mechanism and removes it, the plastic tube clamping mechanism maintains the clamped state throughout the entire process until the end of the plastic tube is connected to the pipe fitting, at which point the plastic tube is released. The plastic tube clamping mechanism (i.e., the tube inserter) includes a plastic tube clamping finger cylinder (i.e., a clamping mechanism capable of driving the two plastic tube clamping claws to clamp or separate) and two plastic tube clamping claws. The plastic tube clamping finger cylinder has two fingers, and the two plastic tube clamping claws are respectively connected to the two fingers of the plastic tube clamping finger cylinder. When the plastic tube clamping finger cylinder drives the two plastic tube clamping claws to clamp, the two plastic tube clamping claws hold the plastic tube.

[0003] However, because the end of the plastic tube needs to be expanded, the clamping position of the plastic tube clamp on the plastic tube needs to be a short distance from the end of the plastic tube in order to prevent the plastic tube clamp from obstructing the expansion operation (the end of the tube expands outward during the expansion operation). Therefore, the end of the plastic tube is actually a free end, and the plastic tube clamping mechanism does not perform position calibration and positioning for the end of the plastic tube. As a result, during the process of the plastic tube position switching mechanism moving the plastic tube clamping mechanism and the plastic tube, the position of the end of the plastic tube on the plastic tube clamping mechanism will deviate. Especially when the plastic tube is moved to the expansion mechanism for expansion or when the end of the plastic tube is connected to the pipe fitting, if the position of the end of the plastic tube is deviated, it will lead to the failure of the expansion or insertion operation, resulting in waste. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a cannula clamp that can calibrate and position the end of a plastic tube, effectively preventing positional deviations. The technical solution adopted is as follows:

[0005] A tube clamp includes two plastic tube clamps and a clamp opening and closing mechanism capable of driving the two plastic tube clamps to clamp or separate. The plastic tube clamps are characterized by: a movable block guide structure extending in the inward and outward directions on each plastic tube clamp; a movable block movable along the movable block guide structure is mounted on the movable block guide structure; a first limiting groove is provided on the inner side of the movable block; and an elastic telescopic device is provided on the plastic tube clamps to cause the movable block to move inward. When the two plastic tube clamps are engaged, the two plastic tube clamps hold the plastic tube, and the two movable blocks hold the end of the plastic tube.

[0006] In the aforementioned inside and outside directions, inside refers to the side facing the plastic tube during operation, and outside refers to the side facing away from the plastic tube during operation.

[0007] Initially, the two plastic tube clamps are separated, and the elastic telescopic devices on the two clamps extend. Under the action of their respective elastic telescopic devices, the two movable blocks move to the innermost end of their stroke. When the insertion clamp reaches the position of the plastic tube positioning mechanism, the clamp opening and closing mechanism drives the two plastic tube clamps to close. The two plastic tube clamps hold the plastic tube on the plastic tube positioning mechanism (the clamping position of the two plastic tube clamps on the plastic tube is a short distance from the end of the plastic tube). At the same time, the two movable blocks hug the end of the plastic tube from both sides. During the hugging process, the end of the plastic tube enters the two... Position calibration is performed in the first limiting groove of the movable block, and the two movable blocks move outward under the pressure of the plastic tube end. The elastic telescopic device contracts and applies an inward force to the movable blocks, enabling the two movable blocks to clamp and position the plastic tube end. From the moment the insertion clamp holds the plastic tube on the plastic tube positioning mechanism and removes it until the tube end is connected to the pipe fitting, the insertion clamp maintains the clamped state, and the two movable blocks maintain the clamped state until the connection between the plastic tube end and the pipe fitting is completed, at which point the plastic tube is released. During the tube end-expanding operation by the tube-expanding mechanism, as the tube end expands, the tube wall pushes the two movable blocks outward. The two movable blocks do not obstruct the tube-expanding operation and maintain the clamped state of the plastic tube end.

[0008] In the preferred embodiment, the first limiting groove is an arc-shaped groove (i.e., the inner wall of the groove is an arc in cross-section) or a V-shaped groove (i.e., the inner wall of the groove is V-shaped in cross-section).

[0009] The aforementioned movable block guide structure is typically located on or near the lower side of the plastic tube clamp. The upper and lower positions of the plastic tube clamp are relative; when the two plastic tube clamps hold the plastic tube, the side where the end of the plastic tube is located is the lower side.

[0010] In the preferred embodiment, the aforementioned movable block guide structure is a strip-shaped guide hole disposed in the plastic tube clamp. The strip-shaped guide hole extends in the inward and outward directions, and the movable block is located in the strip-shaped guide hole and slides in contact with the hole wall of the strip-shaped guide hole. In this case, the cross-sectional shape and size of the strip-shaped guide hole are usually matched with the movable block, and the cross-sectional shape of the strip-shaped guide hole is usually polygonal (such as convex, concave, quadrilateral, etc.).

[0011] The aforementioned movable block guide structure can also be a guide rail set on the surface of the plastic pipe clamp, with the movable block mounted on the guide rail and slidingly engaging with it.

[0012] In a preferred embodiment, the aforementioned elastic telescopic device includes a compression spring and a limiting plate. The limiting plate is mounted on the plastic tube clamp and is located outside the movable block. The inner and outer ends of the compression spring are in contact with or connected to the movable block and the limiting plate, respectively. The outer end of the compression spring is in contact with or connected to the limiting plate, and when compressed, it can apply an inward force to the movable block. In a more preferred embodiment, the aforementioned elastic telescopic device further includes a spring positioning rod. The limiting plate has a through hole for the spring positioning rod to pass through. The inner end of the spring positioning rod is connected to the movable block. The compression spring is sleeved on the middle part of the spring positioning rod, and the outer end of the spring positioning rod extends to the outside of the through hole. The outer end of the spring positioning rod has an external thread section, on which a limiting nut is installed. The limiting nut contacts the outer surface of the limiting plate. By adjusting the position of the limiting nut on the external thread section, the initial position of the movable block and the length of the compression spring in the initial state can be adjusted. When the movable block guide structure is a strip guide hole set in the plastic tube clamp, it is preferable that the limiting plate is installed on the outer side of the outer end of the strip guide hole, the through hole on the limiting plate corresponds to the position of the strip guide hole, and the compression spring and spring positioning rod are located in the strip guide hole.

[0013] The aforementioned elastic telescopic device can also be a cylinder-type buffer, with its cylinder body mounted on a plastic tube clamp, its piston rod facing inward, and its inner end connected to the outer side of the movable block, which can apply an inward force to the movable block.

[0014] In the preferred embodiment, the aforementioned plastic tube clamp is provided with multiple clamping plates arranged in sequence, with clamping plate insertion gaps between adjacent clamping plates; the clamping plates and clamping plate insertion gaps on one plastic tube clamp correspond to and cooperate with the clamping plate insertion gaps and clamping plates on another plastic tube clamp (the clamping plates on one plastic tube clamp can be inserted into the clamping plate insertion gaps on another plastic tube clamp); each clamping plate has a second limiting groove on its inner surface; on the same plastic tube clamp, the second limiting grooves on each clamping plate are aligned with the first limiting grooves, and each second limiting groove is located above the first limiting groove. The second limiting grooves are used to accommodate the portion of the plastic tube near the end of the plastic tube. When the plastic tube clamp holds the plastic tube, the plastic tube is located in each of the second limiting grooves, which helps to maintain the stability of the plastic tube position on the clamp.

[0015] The aforementioned second limiting groove can be an arc-shaped groove or a V-shaped groove.

[0016] In a preferred embodiment, the gripper opening and closing mechanism includes a plastic tube gripping finger cylinder, which has two fingers, and two plastic tube grippers are respectively connected to the two fingers of the plastic tube gripping finger cylinder. In a more preferred embodiment, the gripper opening and closing mechanism further includes a plastic tube gripper guiding mechanism, which includes a guide rail and two sliders. The guide rail is fixedly mounted on the cylinder body of the plastic tube gripping finger cylinder, and the two sliders are both mounted on the guide rail and can move along the guide rail in the inward and outward directions. The two plastic tube grippers are respectively connected to the two sliders.

[0017] In another preferred embodiment, the aforementioned gripper opening and closing mechanism includes a support, a guide rail, a first connecting rod, a second connecting rod, and a cylinder. The guide rail and cylinder are both fixedly mounted on the support. Each of the two plastic tube grippers has a slider, both sliders are mounted on the guide rail and slide in cooperation with it. The cylinder is perpendicular to the guide rail. A connecting block is mounted on the piston rod of the cylinder. The first end of the first connecting rod is hinged to one slider, and the second end of the first connecting rod is hinged to the connecting block. The first end of the second connecting rod is hinged to another slider, and the second end of the second connecting rod is hinged to the connecting block. When the piston rod of the cylinder extends or retracts, it can drive the second ends of the first and second connecting rods to move through the connecting block, causing the first ends of the first and second connecting rods to move closer together or further apart, driving the two sliders to move towards each other or away from each other, thereby causing the two plastic tube grippers to move towards each other (clamping) or away from each other (separating).

[0018] In another preferred embodiment, the aforementioned gripper opening and closing mechanism includes a support, a drive motor, a screw, and a guide rail. The drive motor and guide rail are both fixedly mounted on the support. Each of the two plastic tube grippers has a slider, both sliders are mounted on the guide rail and slide in engagement with it. The screw is rotatably mounted on the support and parallel to the guide rail. The drive motor's power output shaft is connected to the screw. The screw has a first threaded section and a second threaded section with opposite helical directions. One slider has a threaded hole that meshes with the first threaded section, and the other slider has a threaded hole that meshes with the second threaded section. When the drive motor drives the screw to rotate, it simultaneously drives the two sliders to translate along the guide rail. Because the first and second threaded sections have opposite helical directions, the two sliders can move towards each other or away from each other, thereby allowing the two plastic tube grippers to move towards each other (clamping) or away from each other (separating).

[0019] This invention features movable blocks on two plastic tube clamps. When the two clamps are engaged, the movable blocks embrace the plastic tube end from both sides, allowing the plastic tube end to enter the first limiting groove of the two movable blocks for position calibration. Furthermore, an elastic telescopic device applies an inward force to the movable blocks, enabling them to hold and position the plastic tube end. This allows the tube clamp to calibrate and position the plastic tube end, effectively preventing positional deviations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a preferred embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram (top view) of the structure of the plastic pipe clamp claw on one side in the preferred embodiment 1 of this utility model.

[0022] Figure 3 yes Figure 2 AA section view;

[0023] Figure 4 This is a schematic diagram (top view) of the movable block in the preferred embodiment 1 of this utility model.

[0024] Figure 5 This is an exploded perspective view of the plastic pipe clamp claw on the other side in the preferred embodiment 1 of this utility model;

[0025] Figure 6 This is a schematic diagram of the plastic tube clamping claw on one side in the clamping state of the preferred embodiment 1 of this utility model;

[0026] Figure 7 This is a schematic diagram of the plastic pipe clamp claw on one side in the expanded pipe opening state of the preferred embodiment of this utility model;

[0027] Figure 8 This is a schematic diagram of the gripper opening and closing mechanism in the preferred embodiment 2 of this utility model;

[0028] Figure 9 This is a schematic diagram of the gripper opening and closing mechanism in the preferred embodiment 3 of this utility model;

[0029] Figure 10 This is a schematic diagram (top view) of the movable block in the preferred embodiment 4 of this utility model. Detailed Implementation

[0030] Example 1, such as Figures 1-5 As shown, this tube clamp includes two plastic tube clamps 1 and a clamp opening and closing mechanism 2 capable of driving the two plastic tube clamps 1 to clamp or separate. The plastic tube clamps 1 are provided with a movable block guide structure extending in the inward and outward directions. A movable block 3, capable of moving along the movable block guide structure, is mounted on the movable block guide structure. A first limiting groove 31 is provided on the inner side of the movable block 3. The plastic tube clamps 1 are provided with an elastic telescopic device that allows the movable block 3 to tend to move inward. When the two plastic tube clamps 1 are engaged, they hold the plastic tube 10, and the two movable blocks 3 hold the end 101 of the plastic tube.

[0031] refer to Figures 3-5 The first limiting groove 31 is an arc-shaped groove (that is, the inner wall of the groove is an arc in cross-section).

[0032] In this embodiment, the movable block guide structure is a strip-shaped guide hole 4 disposed in the plastic tube clamp 1. The strip-shaped guide hole 4 extends in the inward and outward directions, and the movable block 3 is located in the strip-shaped guide hole 4 and slides in cooperation with the hole wall of the strip-shaped guide hole 4. The cross-sectional shape and size of the strip-shaped guide hole 4 match the movable block 3. In this embodiment, the cross-sectional shape of the strip-shaped guide hole 4 is convex. The cross-sectional shape of the strip-shaped guide hole can also be other polygons (such as concave shapes, quadrilaterals, etc.), or other shapes (such as ellipses). The strip-shaped guide hole 4 is located near the lower side of the plastic tube clamp 1.

[0033] In this embodiment, the elastic telescopic device includes a compression spring 5 and a limiting plate 6. The limiting plate 6 is installed on the plastic tube clamp 1 and is located outside the movable block 3. The inner and outer ends of the compression spring 5 are in contact with or connected to the movable block 3 and the limiting plate 4, respectively. The elastic telescopic device also includes a spring positioning rod 7. The limiting plate 6 has a through hole 8 for the spring positioning rod 7 to pass through. The inner end of the spring positioning rod 7 is connected to the movable block 3 (in this embodiment, the outer surface of the movable block 3 has a screw hole 32, and the inner end of the spring positioning rod 7 is connected to the screw hole 32 through an external thread). The compression spring 5 is sleeved on the middle part of the spring positioning rod 7, and the outer end of the spring positioning rod 7 extends to the outside of the through hole 8. The outer end of the spring positioning rod 7 has an external thread section 71, and a limiting nut 9 is installed on the external thread section 71. The limiting nut 9 is in contact with the outer surface of the limiting plate 6. The limiting plate 6 is installed outside the outer end of the strip guide hole 4. The through hole 8 on the limiting plate 6 corresponds to the position of the strip guide hole 4. The compression spring 5 and the spring positioning rod 7 are located in the strip guide hole 4. The outer end of the compression spring 5 is in contact with or connected to the limiting plate 6, and can apply an inward force to the movable block 3 when compressed. By adjusting the position of the limiting nut 9 on the external thread section 71, the initial position of the movable block 4 and the length of the compression spring 5 in the initial state can be adjusted.

[0034] In this embodiment, the plastic tube clamp 1 is provided with a plurality of clamping pieces 11 arranged in sequence, and there is a clamping piece insertion gap 12 between two adjacent clamping pieces 11; the clamping pieces 11 and the clamping piece insertion gap 12 on one plastic tube clamp 1 correspond to and cooperate with the clamping piece insertion gap 12 and the clamping piece 11 on another plastic tube clamp 1 (the clamping piece 11 on one plastic tube clamp 1 can be inserted into the clamping piece insertion gap 12 on another plastic tube clamp 1); each clamping piece 11 has a second limiting groove 13 on its inner side; on the same plastic tube clamp 1, the second limiting groove 13 on each clamping piece 11 is aligned with the first limiting groove 31; each second limiting groove 13 is located above the first limiting groove 31. The second limiting groove 13 is used to accommodate the part of the plastic tube 10 near the end 101 of the plastic tube. When the plastic tube clamp 1 clamps the plastic tube, the plastic tube is in each of the second limiting grooves 13, which is beneficial for the plastic tube to maintain a stable position on the tube clamp. In this embodiment, the second limiting groove 13 is an arc-shaped groove.

[0035] In this embodiment, the gripper opening and closing mechanism 2 includes a plastic tube gripping finger cylinder 21, which has two fingers 212. Two plastic tube grippers 1 are respectively connected to the two fingers 212 of the plastic tube gripping finger cylinder 21. The gripper opening and closing mechanism 2 also includes a plastic tube gripper guiding mechanism, which includes a guide rail 22 and two sliders 23. The guide rail 22 is fixedly installed on the cylinder body 211 of the plastic tube gripping finger cylinder 21. The two sliders 23 are both installed on the guide rail 22 and can move in the inward and outward directions along the guide rail 22. The two plastic tube grippers 212 are respectively connected to the two sliders 23. When the two fingers 212 of the plastic tube gripping finger cylinder 21 separate, the two sliders 23 move away from each other along the guide rail 22, and the two plastic tube grippers 1 separate. When the two fingers 212 of the plastic tube gripping finger cylinder 21 come together, the two sliders 23 move towards each other along the guide rail 22, and the two plastic tube grippers 1 clamp together.

[0036] The working principle of this cannula clamp is briefly described below:

[0037] refer to Figure 3 In the initial state, the two plastic pipe clamps 1 separate, and the elastic telescopic devices on the two plastic pipe clamps 1 extend (compression spring 5 extends). Under the action of their respective elastic telescopic devices, the two movable blocks 3 move to the innermost end of their stroke; Reference Figure 6When the insertion clamp reaches the position of the plastic tube positioning mechanism, the clamp opening and closing mechanism 2 drives the two plastic tube clamps 1 to clamp together. The two plastic tube clamps 1 hold the plastic tube 10 on the plastic tube positioning mechanism (the clamping position of the two plastic tube clamps 1 on the plastic tube 10 is a short distance away from the end 101 of the plastic tube). The plastic tube 10 is in each of the second limiting grooves 13. At the same time, the two movable blocks 3 hug the end 101 of the plastic tube from both sides. During the hugging process, the end 101 of the plastic tube enters the first limiting groove 31 of the two movable blocks 3 for position calibration, and the two movable blocks 3... Block 3 moves outward under the pressure of the plastic tube end 101. The elastic telescopic device contracts (compression spring 5 contracts) and applies an inward force to the movable block 3, allowing the two movable blocks 3 to clamp and position the plastic tube end 101. From the moment the insertion clamp holds the plastic tube on the plastic tube positioning mechanism and removes it until the tube end is connected to the pipe fitting, the insertion clamp maintains the clamping state of the plastic tube 101, while the two movable blocks 3 maintain the clamping state of the plastic tube end until the connection between the plastic tube end and the pipe fitting is completed, at which point the plastic tube is released. (Reference) Figure 7 During the process of the expansion mechanism expanding the opening of the plastic tube end 101, when the opening of the plastic tube end 101 is expanded, the tube wall of the plastic tube end 101 will push the two movable blocks 3 to move outward. The two movable blocks 3 will not hinder the expansion operation and can maintain the state of clamping the plastic tube end 101.

[0038] Example 2, Reference Figure 8 In this embodiment, the gripper opening and closing mechanism 2 includes a support 24, a guide rail 25, a first connecting rod 26, a second connecting rod 27, and a cylinder 28. The guide rail 25 and the cylinder are both fixedly mounted on the support 24. Each of the two plastic tube grippers 1 is provided with a slider 29. Both sliders 29 are mounted on the guide rail 25 and slide in cooperation with the guide rail 25. The cylinder 28 is perpendicular to the guide rail 25. A connecting block 210 is mounted on the piston rod of the cylinder 25. The first end of the first connecting rod 26 is hinged to a slider 29, and the second end of the first connecting rod 26 is hinged to the connecting block 210. The first end of the second connecting rod 27 is hinged to another slider 29, and the second end of the second connecting rod 27 is hinged to the connecting block 210. When the piston rod of cylinder 28 extends or retracts, it can drive the second end of the first connecting rod 26 and the second end of the second connecting rod 27 to move through the connecting block 210, so that the first end of the first connecting rod 26 and the first end of the second connecting rod 27 move closer to each other or separate, driving the two sliders 29 to move towards each other or away from each other, thereby causing the two plastic tube clamps 1 to move towards each other (clamp) or away from each other (separate).

[0039] The remaining structures of this embodiment 2 can be set with reference to that of embodiment 1.

[0040] Example 3, Reference Figure 9In this embodiment, the gripper opening and closing mechanism 2 includes a support 221, a drive motor 222, a screw 223, and a guide rail 224. The drive motor 222 and the guide rail 224 are both fixedly mounted on the support 221. Each of the two plastic tube grippers 1 is provided with a slider 225. Both sliders 225 are mounted on the guide rail 224 and slide in cooperation with the guide rail 224. The screw 223 is rotatably mounted on the support 221 and is parallel to the guide rail 224. The power output shaft of the drive motor 222 is connected to the screw 223 for transmission. The screw 223 has a first threaded section 2231 and a second threaded section 2232 with opposite helical directions. One slider 225 is provided with a screw hole that meshes with the first threaded section 2231, and the other slider 225 is provided with a screw hole that meshes with the second threaded section 2232. When the drive motor 222 drives the screw 223 to rotate, it simultaneously drives the two sliders 225 to translate along the guide rail 224. Since the first threaded section 2231 and the second threaded section 2232 have opposite spiral directions, the two sliders 225 can move towards each other or away from each other, thereby allowing the two plastic tube clamps 1 to move towards each other (clamp) or away from each other (separate).

[0041] The remaining structures of this embodiment 3 can be set with reference to that of embodiment 1.

[0042] Example 4, Reference Figure 10 In this embodiment, the first limiting groove 31 on the inner side of the movable block 3 is a V-shaped groove (i.e., the inner wall of the groove is V-shaped in cross-section). The second limiting groove 13 is also a V-shaped groove. The remaining structures of this embodiment 4 can be set with reference to embodiment 1.

[0043] In other embodiments, the movable block guide structure can also be a guide rail set on the surface of the plastic tube clamp, with the movable block mounted on the guide rail and slidingly engaging with it.

[0044] In other embodiments, the elastic telescopic device may also be a cylinder-type damper, with its cylinder body mounted on a plastic tube clamp, its piston rod facing inward, and its inner end connected to the outer side of the movable block, capable of applying an inward force to the movable block.

Claims

1. A cannula clamp hand comprising two plastic cannula clamp jaws and a jaw opening and closing mechanism capable of driving the two plastic cannula clamp jaws to clamp or separate, characterized in that: The plastic pipe clamping jaw is provided with a movable block guide structure extending in the inward and outward directions, the movable block guide structure is provided with a movable block capable of moving along the movable block guide structure, the inner side surface of the movable block is provided with a first limiting groove, and the plastic pipe clamping jaw is provided with an elastic expansion device capable of making the movable block have a tendency to move inward.

2. The intubating forceps hand of claim 1, wherein: The first limiting groove is an arc-shaped groove or a V-shaped groove.

3. The intubating forceps hand of claim 1 or 2, wherein: The movable block guide structure is a strip-shaped guide hole arranged in the plastic pipe clamping jaw, the strip-shaped guide hole extends in the inward and outward directions, and the movable block is arranged in the strip-shaped guide hole and is in sliding fit with the hole wall of the strip-shaped guide hole.

4. The intubating forceps of claim 1 or 2, wherein: The elastic expansion device comprises a compression spring and a limiting plate, the limiting plate is arranged on the plastic pipe clamping jaw and is located at the outer side of the movable block, and the inner end and the outer end of the compression spring are in contact with or connected with the movable block and the limiting plate respectively.

5. The intubating forceps hand of claim 4, wherein: The elastic expansion device further comprises a spring positioning rod, the limiting plate is provided with a through hole through which the spring positioning rod passes, the inner end of the spring positioning rod is connected with the movable block, the compression spring is sleeved on the middle part of the spring positioning rod, and the outer end of the spring positioning rod extends to the outside of the through hole; the outer end of the spring positioning rod is provided with an outer threaded section, a limiting nut is arranged on the outer threaded section, and the limiting nut is in contact with the outer side surface of the limiting plate.

6. The cannula clamp hand according to claim 3, characterized in that: The elastic expansion device comprises a compression spring and a limiting plate, the limiting plate is arranged on the plastic pipe clamping jaw and is located at the outer side of the movable block, and the inner end and the outer end of the compression spring are in contact with or connected with the movable block and the limiting plate respectively; The elastic expansion device further comprises a spring positioning rod, the limiting plate is provided with a through hole through which the spring positioning rod passes, the inner end of the spring positioning rod is connected with the movable block, the compression spring is sleeved on the middle part of the spring positioning rod, and the outer end of the spring positioning rod extends to the outside of the through hole; the outer end of the spring positioning rod is provided with an outer threaded section, a limiting nut is arranged on the outer threaded section, and the limiting nut is in contact with the outer side surface of the limiting plate; The limiting plate is arranged on the outer side of the outer end of the strip-shaped guide hole, the through hole in the limiting plate corresponds to the position of the strip-shaped guide hole, and the compression spring and the spring positioning rod are arranged in the strip-shaped guide hole.

7. The intubating forceps hand of claim 1 or 2, wherein: The plastic pipe clamping jaw is provided with a plurality of clamping pieces arranged in sequence, and each two adjacent clamping pieces have a clamping piece insertion gap; the clamping piece and the clamping piece insertion gap on one plastic pipe clamping jaw correspond to the clamping piece insertion gap and the clamping piece on the other plastic pipe clamping jaw respectively; each clamping piece is provided with a second limiting groove on the inner side surface; on the same plastic pipe clamping jaw, the second limiting grooves on the clamping pieces are aligned with each other and are located above the first limiting groove.

8. The intubating forceps hand of claim 1 or 2, wherein: The clamping jaw opening and closing mechanism comprises a plastic pipe clamping finger air cylinder, and the plastic pipe clamping finger air cylinder has two fingers; the two plastic pipe clamping jaws are connected with the two fingers of the plastic pipe clamping finger air cylinder respectively.

9. The intubating forceps of claim 1 or 2, wherein: The jaw opening and closing mechanism comprises a support, a guide rail, a first connecting rod, a second connecting rod and a cylinder, the guide rail and the cylinder are fixedly installed on the support, two plastic tube clamping jaws are respectively provided with a sliding block, the two sliding blocks are installed on the guide rail and are in sliding cooperation with the guide rail, the cylinder is perpendicular to the guide rail, a connecting block is installed on the piston rod of the cylinder, the first end of the first connecting rod is hingedly connected with a sliding block, the second end of the first connecting rod is hingedly connected with the connecting block, the first end of the second connecting rod is hingedly connected with another sliding block, and the second end of the second connecting rod is hingedly connected with the connecting block.

10. The intubating forceps of claim 1 or 2, wherein: The jaw opening and closing mechanism comprises a support, a drive motor, a screw rod and a guide rail, the drive motor and the guide rail are fixedly installed on the support, two plastic tube clamping jaws are respectively provided with a sliding block, the two sliding blocks are installed on the guide rail and are in sliding cooperation with the guide rail, the screw rod is rotatably installed on the support and is parallel to the guide rail, the power output shaft of the drive motor is in transmission connection with the screw rod, the screw rod has a first threaded section and a second threaded section with opposite screw directions, a screw hole in mesh with the first threaded section is arranged on one sliding block, and a screw hole in mesh with the second threaded section is arranged on the other sliding block.

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