Reducing traction structure of endoscope hook head

Abstract

Compared with the prior art, the endoscope hook head variable-diameter traction structure has the following beneficial effects that the steering engine drives the driving traction wheel to rotate, the driving traction wheel drives the two driven traction wheels to rotate synchronously, so that the second traction rope is pulled, the hook head is pulled to deflect, and the hook head is pulled to deflect through the transmission ratio of the driving traction wheel to the driven traction wheels; the traction distance of the second traction rope is larger than the traction distance of the first traction rope, the traction length of the second traction rope can be guaranteed on the premise that the small size of the traction wheel is guaranteed, and therefore the traction wheel can adapt to the working condition of a long-size insertion end, and the small size of an operation handle can be guaranteed. Comprising a main traction wheel provided with a first wire slot; each driving traction wheel is correspondingly provided with two driven traction wheels, a second wire groove and a third wire groove are formed in the peripheral surface of each driven traction wheel at intervals, and the perimeter of each second wire groove is smaller than that of each third wire groove; a first traction rope is wound around the second wire groove, and the other end of the first traction rope is connected with the first wire groove.

Description

Technical Field

[0001] The invention relates to the technical field of industrial endoscopes, and in particular to an endoscope hook head diameter-changing pulling structure. Background Art

[0002] As a non-destructive testing device, the industrial endoscope can detect and observe the internal structure of an object without disassembling or destroying the object.

[0003] The endoscope includes a control handle and a detection end for inserting into the object to be detected. The head of the detection end is provided with a hook head. The control handle is provided with a variable diameter pulling structure connected to the bending section. The bending angle of the hook head can be adjusted by pulling the variable diameter pulling structure.

[0004] At present, for high-depth and long-distance detection, the insertion end of the endoscope needs to be set very long, which means that the length of the traction rope needs to be set very long. Since the traction rope has tensile elasticity, when the length becomes longer, the length that the driving wheel needs to pull will increase when the driving hook is bent at the same angle. The current way to deal with this is to increase the size of the traction wheel. When the size of the traction wheel is increased, the handle size will be too large, which is not conducive to operation. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and provide an endoscope hook diameter-changing pulling structure.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: an endoscope hook head diameter-changing pulling structure, comprising: A main traction wheel is connected to the steering gear drive, and a first wire groove is arranged on the outer peripheral surface of the main traction wheel; A driven traction wheel, two of which are provided for each main traction wheel. A second wire groove and a third wire groove are provided at intervals on the outer peripheral surface of the driven traction wheel along the axial direction. The circumference of the second wire groove is smaller than the circumference of the third wire groove. The second wire groove is wound with a first traction rope, and the other end of the first traction rope is connected to the first wire groove.

[0007] Furthermore, along the axial direction, two first wire grooves corresponding to the two driven traction wheels are arranged at intervals on the outer peripheral surface of the main traction wheel.

[0008] Furthermore, the second wire groove of one driven traction wheel is located above the first wire groove, and the second wire groove of another driven traction wheel is located below the first wire groove.

[0009] Furthermore, it comprises a backing plate, which comprises a first mounting surface and a second mounting surface with a height difference along the axial direction of the driven traction wheel, and the two driven traction wheels are rotatably arranged on the first mounting surface and the second mounting surface respectively.

[0010] Furthermore, a first mounting groove is provided on the first mounting surface, and a third threading port is provided on one side of the first mounting groove. When the driven traction wheel is rotatably disposed in the first mounting groove, the inner circumference of the first mounting groove blocks the outer circumference of the third wire groove, and a first threading port corresponding to the first mounting groove for passing the first traction rope is provided on the second mounting surface.

[0011] Furthermore, a second mounting groove is arranged on the second mounting surface, a third mounting groove is arranged coaxially on the bottom surface of the second mounting groove, when the driven traction wheel is rotatably arranged in the second mounting groove, the second wire groove is located in the third mounting groove, and the third wire groove is located in the second mounting groove.

[0012] Furthermore, a second threading opening is provided on one side of the second mounting groove close to the first mounting surface, and a bottom surface of the second threading opening is higher than the first mounting surface.

[0013] Furthermore, it also includes a support plate, the pad and the main traction wheel are both arranged on a first surface of the support plate, and the steering gear is arranged on a surface opposite to the first surface.

[0014] Furthermore, the third threading port and the second threading port are both provided with a rope clamping assembly, and the rope clamping assembly includes a first clamping jaw and a second clamping jaw which are arranged opposite to each other; It is configured to move in a direction approaching each other when the second traction rope is separated from the third wire groove, so as to clamp and fix the second traction rope.

[0015] Furthermore, the first clamping jaw is arranged above the second clamping jaw, and a first compression spring is arranged between the second clamping jaw and the backing plate, and the first compression spring can provide an elastic force for the second clamping jaw to move closer to the first clamping jaw.

[0016] Compared with the prior art, the variable diameter pulling structure of an endoscope hook head disclosed in the present invention has the following beneficial effects: the steering gear drives the active traction wheel to rotate, and the active traction wheel drives the two driven traction wheels to rotate synchronously, thereby pulling the second traction rope and pulling the hook head to deflect. Through the transmission ratio of the active traction wheel and the driven traction wheel, the distance the second traction rope is pulled is greater than the distance the first traction rope is pulled. The length of pulling the second traction rope can be guaranteed under the premise of ensuring the small size of the traction wheel, thereby being able to adapt to the working conditions of the long insertion end and also ensuring the small size of the operating handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the first embodiment of the endoscope hook variable diameter pulling structure of the present invention is schematically shown. Figure 1 .

[0018] Figure 2 The overall structure of the first embodiment of the endoscope hook variable diameter pulling structure of the present invention is schematically shown. Figure 2 .

[0019] Figure 3 The partial structure diagram of the first embodiment of the endoscope hook variable diameter pulling structure of the present invention is shown in FIG. Figure 1 .

[0020] Figure 4 The partial structure diagram of the first embodiment of the endoscope hook variable diameter pulling structure of the present invention is shown in FIG. Figure 2 .

[0021] Figure 5 The partial structure diagram of the first embodiment of the endoscope hook variable diameter pulling structure of the present invention is shown in FIG. Figure 3 .

[0022] Figure 6 A partial enlarged structural diagram of a traction structure pad of an endoscope hook head with a variable diameter according to the present invention Figure 1 .

[0023] Figure 7 A partial enlarged structural diagram of a traction structure pad of an endoscope hook head with a variable diameter according to the present invention Figure 2 .

[0024] Figure 8 The overall structure of the second embodiment of the endoscope hook variable diameter pulling structure of the present invention is schematically shown. Figure 1 .

[0025] Fig. 9 The local structure diagram of the second embodiment of the endoscope hook variable diameter pulling structure of the present invention Figure 1 .

[0026] Fig.10 For the present invention Fig. 9 Schematic diagram of the enlarged structure at point A in the middle.

[0027] Fig.11 The local structure diagram of the second embodiment of the endoscope hook variable diameter pulling structure of the present invention Figure 2 .

[0028] Fig.12 For the present invention Fig.11 Schematic diagram of the enlarged structure at point B in the middle.

[0029] Fig.13 It is a schematic cross-sectional structure diagram of a position limiting member, a rotating shaft, a rotating cylinder and a driven disk in a second embodiment of an endoscope hook variable diameter pulling structure of the present invention.

[0030] Fig.14 For the present invention Fig.13 Schematic diagram of the enlarged structure at point C in the middle.

[0031] In the figure: 1, steering gear; 10, support plate; 11, pad; 110, first mounting surface; 1101, first mounting groove; 1102, third threading port; 111, second mounting surface; 1111, second mounting groove; 1112, second threading port; 112, first threading port; 113, fourth threading port; 12, support block; 13, threading tube; 14, second traction rope; 15, wire tube; 16, first pressure plate; 17, second pressure plate; 2, main traction wheel; 20, first wire groove; 21, first traction rope; 3, driven traction wheel; 31, second wire groove slot; 32, third wire slot; 33, transmission surface; 4, rope clamping assembly; 41, first clamping jaw; 42, second clamping jaw; 420, rigid rod; 421, connecting member; 423, clamping slot; 424, guide rod; 43, limit member; 44, rotating drum; 441, first annular groove; 442, second annular groove; 443, protrusion; 444, intersection; 45, driven disk; 451, guide slot; 452, guide plate; 453, second compression spring; 46, inertia member; 461, rolling member; 47, first compression spring; 40, rotating shaft; 401, transmission wheel. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0033] Embodiment 1 Please refer to Figure 1-7 As a specific implementation method, the technical solution of the present invention is: an endoscope hook diameter-changing pulling structure, comprising: A main traction wheel 2 is drivingly connected to the steering gear 1, and a first wire groove 20 is provided on the outer peripheral surface of the main traction wheel 2; A driven traction wheel 3, two of which are provided for each main traction wheel 2. A second wire groove 31 and a third wire groove 32 are provided at intervals on the outer peripheral surface of the driven traction wheel 3 along the axial direction. The circumference of the second wire groove 31 is smaller than the circumference of the third wire groove 32. The first traction rope 21 is wound around the second wire groove 31 , and the other end of the first traction rope 21 is connected to the first wire groove 20 .

[0034] Specifically, the specific scheme of the endoscope hook head variable diameter pulling structure provided by the present application is as follows: it includes a main traction wheel 2, the main traction wheel 2 is connected to a steering gear 1, the steering gear 1 can drive the main traction wheel 2 to rotate around the axis, is located on one side of the main traction wheel 2, and is rotatably provided with two driven traction wheels 3, the axes of the two driven traction wheels 3 are parallel to the axis of the main traction wheel 2, the driven traction wheel 3 includes a second wire groove 31 and a third wire groove 32, a first traction rope 21 is wound around the second wire groove 31, the other end of the first traction rope 21 is connected to the first wire groove 20 of the main traction wheel 2, the third wire groove 32 is used to wind a second traction rope 14, the other end of the second traction rope 14 is connected to the hook head, and the two second traction ropes 14 on the two driven traction wheels 3 are used to The invention is used to control the movement of the hook head on a plane, wherein the circumference of the first wire groove 20 is greater than the circumference of the second wire groove 31, and the circumference of the second wire groove 31 is less than the circumference of the third wire groove 32. Through this arrangement, when the steering gear 1 rotates, it drives the active traction wheel to rotate, and the active traction wheel drives the two driven traction wheels 3 to rotate synchronously in opposite directions, thereby pulling the second traction rope 14 and pulling the hook head for deflection. Through the transmission ratio of the active traction wheel and the driven traction wheel 3, the distance that the second traction rope 14 is pulled is greater than the distance that the first traction rope 21 is pulled, and the length of the second traction rope 14 can be guaranteed while ensuring the small size of the traction wheel, thereby being able to adapt to the working condition of the long insertion end and ensuring the small size of the operating handle.

[0035] Further, as a specific implementation method, refer to Figure 1-Figure 6 , along the axial direction, the outer peripheral surface of the main traction wheel 2 is provided with two first wire grooves 20 corresponding to the two driven traction wheels 3. Specifically, by providing two first wire grooves 20 at intervals in the axial direction, the two driven traction wheels 3 are connected one by one through the two first wire grooves 20, so that the two first traction ropes 21 are not entangled, overlapped, or interfered with each other, the traction accuracy of the two driven traction wheels 3 is improved, and the two driven traction wheels 3 can be driven to rotate synchronously during operation.

[0036] Further, as a preferred embodiment, refer to Figure 3-Figure 5, the second wire groove 31 of one of the driven traction wheels 3 is located above the first wire groove 20, and the second wire groove 31 of the other driven traction wheel 3 is located below the first wire groove 20. Specifically, when two first wire grooves 20 are provided and are spaced apart in the axial direction, by staggering the two driven traction wheels 3, the second wire groove 31 of one traction wheel is located above the third wire groove 32, so that the second wire groove 31 of the traction wheel can correspond to the first wire groove 20 above at the same height; the second wire groove 31 of the other traction wheel is located below the third wire groove 32, so that the second wire groove 31 of the traction wheel corresponds to the first wire groove 20 below at the same height, thereby ensuring that the first traction ropes 21 in the two second wire grooves 31 can be pulled horizontally, and the phenomenon of the first traction rope 21 being out of the groove when the first traction wheel rotates can be avoided, thereby improving stability.

[0037] Further, as a specific implementation method, refer to Figure 6 , Figure 7 , including a pad 11, along the axial direction of the driven traction wheel 3, the pad 11 includes a first mounting surface 110 and a second mounting surface 111 with a height difference, and the two driven traction wheels 3 are rotatably set on the first mounting surface 110 and the second mounting surface 111 respectively.

[0038] Further, as a specific implementation method, refer to Figure 3-Figure 7 A first mounting groove 1101 is provided on the first mounting surface 110, and a third threading port 1102 is provided on one side of the first mounting groove 1101. When the driven traction wheel is rotated and disposed in the first mounting groove 1101, the inner circumference of the first mounting groove 1101 blocks the outer circumference of the third wire groove 32, and a first threading port 112 corresponding to the first mounting groove 1101 for the first traction rope 21 to pass through is provided on the second mounting surface 111.

[0039] Specifically, the pad 11 is provided with a mounting surface and a second mounting surface 111 with a height difference, the first mounting surface 110 is lower than the second mounting surface 111, and a first mounting groove 1101 is provided on the first mounting surface 110, and a first threading port 112 is provided on the second mounting surface 111, the first mounting groove 1101 is a cylindrical groove, when the driven traction wheel 3 is rotated and arranged in the first mounting groove 1101, the third wire groove 32 of the driven traction wheel 3 is located in the first mounting groove 1101, at this time, the inner circumference of the first mounting groove 1101 is adapted to the outer circumference of the third wire groove 32, and the second traction rope 14 wound around the third wire groove 32 is circumferentially limited, which can effectively To prevent the second traction rope 14 from slipping out of the groove, on the other hand, after the driven traction wheel 3 is arranged in the first installation groove 1101, the height of the second wire groove 31 is the same as the first wire groove 20 above. At this time, the first traction rope 21 wound on the first wire groove 20 above can pass through the first threading port 112 to connect with the second wire groove 31. A first pressing plate 16 is arranged above the first installation surface 110, and the first pressing plate 16 is used for limiting. The first pressing plate 16 is provided with a channel for the first traction rope 21 to pass through. A second pressing plate 17 is provided on the second installation surface 111. After the second pressing plate 17 is installed, it can block the first threading port 112, thereby protecting the first traction rope 21 inside.

[0040] Further, as a preferred embodiment, refer to Figure 3 , Figure 6 , Figure 7 , a second mounting groove 1111 is provided on the second mounting surface 111, and a third mounting groove is coaxially provided on the bottom surface of the second mounting groove 1111. When the driven traction wheel 3 is rotatably provided in the second mounting groove 1111, the second wire groove 31 is located in the third mounting groove, and the third wire groove 32 is located in the second mounting groove 1111. Specifically, similarly, when the driven traction wheel 3 is rotatably provided in the second mounting groove 1111, the second wire groove 31 is located in the third mounting groove, and the third wire groove 32 is located in the second mounting groove 1111. Both the second mounting groove 1111 and the third mounting groove are cylindrical grooves, so that the first traction rope 21 and the second traction rope 14 wound around the second wire groove 31 and the third wire groove 32 are limited by the inner circumferential surface of the third mounting groove and the inner circumferential surface of the second mounting groove 1111 to prevent them from falling out of the groove; a fourth threading port 113 is provided on the side wall of the third mounting groove for the first traction rope 21 to pass through.

[0041] Furthermore, a second threading opening 1112 is provided on one side of the second mounting groove 1111 close to the first mounting surface 110, and the bottom surface of the second threading opening 1112 is higher than the first mounting surface 110. Specifically, a second threading opening 1112 is provided on the side wall of the second mounting groove 1111 for the second traction rope 14 to pass through, and the bottom surface of the second threading opening 1112 is higher than the first mounting surface 110. After the second pressing plate 17 is installed on the second mounting surface 111, the second threading opening 1112 is blocked, the wiring harness is limited, and the risk of the wiring harness coming out of the groove is reduced. In addition, through this arrangement, after the second traction rope 14 passes through the second threading opening 1112, it is limited by the bottom surface to ensure that the second traction rope 14 does not contact the first mounting surface 110, thereby reducing wear.

[0042] Further, as a specific implementation method, refer to Figure 1-Figure 7 , further comprising a support plate 10, the pad 11 and the main traction wheel 2 are both arranged on the first surface of the support plate 10, and the servo 1 is arranged on the surface opposite to the first surface. Specifically, the support plate 10 is a rigid plate, the pad 11 is detachably fixed on the support plate 10, the servo 1 is arranged at one end of the pad 11, and a support block 12 is arranged at the other end of the support plate 10, and a threading tube 13 for the second traction rope 14 to pass through is arranged on the support block 12, and a wire tube 15 is arranged on the side of the support block 12 away from the pad 11, and the second traction rope 14 passes through the threading tube 13 and passes through the guide tube, and the guide tube is used to connect with the insertion end of the endoscope. This arrangement has a reasonable overall structure and can effectively ensure the size of the variable diameter traction structure.

[0043] Further, as a specific implementation, it can be understood that, in the prior art, each hook head has two pulling structures, and the two pulling structures control the hook head in two directions perpendicular to each other. Figure 1 In the present application, two pulling structures are symmetrically arranged on the first surface of the mounting plate about the axis of the guide tube.

[0044] Embodiment 2 It is understandable that, since the second traction rope 14 is subjected to a large force at one end, the second traction rope 14 and the end fixed to the third wire groove 32 may be torn apart during use. When the insertion end of the endoscope is too long, the second traction rope 14 will be stretched to a certain extent when the traction structure pulls the hook head, so it has a rebound force. When the second traction rope 14 pulls the hook head to bend and the second traction rope 14 is suddenly torn apart, under the action of the rebound force of the second traction rope 14, one end of the hook head will quickly recover from the bent state to the straight state. At this time, if the environmental space detected by the hook head is small, the hook head will collide with the side wall of the detection environment when it is reset, and the camera set at the end of the hook head is at risk of damage. In order to improve safety, please refer to Figure 8-14As a specific implementation, the difference from the first embodiment is that the technical solution of the present invention is: an endoscope hook head variable diameter pulling structure, further, the third threading port 1102 and the second threading port 1112 are both provided with a rope clamping assembly 4, and the rope clamping assembly 4 includes a first clamping jaw 41 and a second clamping jaw 42 arranged oppositely; the first clamping jaw 41 and the second clamping jaw 42 are configured to move in a direction close to each other when the second traction rope 14 is separated from the third wire groove 32, and clamp and fix the second traction rope 14. Specifically, by providing the rope clamping assembly 4, the rope clamping assembly 4 does not clamp the second traction rope 14 in a normal state, and the second traction rope 14 can freely pass through the rope clamping assembly 4. When the driven traction wheel 3 pulls the second traction rope 14 to tighten, if the second traction rope 14 suddenly breaks, the rope clamping assembly 4 can clamp the second traction rope 14, reduce the rebound speed of the second traction rope 14, thereby reducing the speed of the hook head resetting, effectively reducing the phenomenon of the hook head hitting, and effectively reducing the phenomenon of the camera hitting.

[0045] Further, as a specific implementation method, refer to Figure 9-14 The first clamping jaw 41 is arranged above the second clamping jaw 42 , and a first compression spring 47 is arranged between the second clamping jaw 42 and the pad 11 . The first compression spring 47 can provide an elastic force for the second clamping jaw 42 to move closer to the first clamping jaw 41 .

[0046] Specifically, the rope clamping assembly 4 provided at the third threading opening 1102 is taken as an example. The specific structure of the rope clamping assembly 4 is as follows: the first clamping jaw 41 is fixed on the first pressing plate 16. When the first pressing rod is installed on the first mounting surface 110, the first clamping jaw 41 is located in the area corresponding to the third threading opening 1102. The second clamping jaw 42 is a plate-shaped structure, and a clamping groove 423 is provided on the upper surface. Two rigid rods 420 are provided on the upper surface of the second clamping jaw 42, and a guide rod 424 is provided on the lower surface. The first pressing plate 16 is provided with a guide rod 424 corresponding to the rigid rod 420. The third threading port 1102 is provided with a blind hole adapted to the guide rod 424 on the bottom surface of the third threading port 1102, a first compression spring 47 is provided between the bottom surface of the blind hole and the second clamping jaw 42, and the first compression spring 47 provides an upward thrust for the second clamping jaw 42, a connecting member 421 is provided on the upper end of the rigid rod 420, and a limiting member 43 is provided above the connecting member 421, a rotating shaft 40 is rotatably provided on the first pressure plate 16, a transmission wheel 401 is provided on the lower end of the rotating shaft 40, and a transmission surface 33 is coaxially provided on the driven traction wheel 3 The transmission surface 33 is a circumferential surface, and the transmission surface 33 is in transmission cooperation with the transmission wheel 401. A rotating drum 44 is rotatably provided at the upper end of the rotating shaft 40, and the rotating drum 44 is axially limited with the rotating shaft 40. A driven disk 45 is transmission-connected to the upper end of the rotating shaft 40. A plurality of strip-shaped guide grooves 451 are uniformly spaced around the axis on one surface of the driven disk 45 close to the rotating drum 44. The guide grooves 451 extend radially in a direction away from the axis. A guide plate 452 is provided in the guide groove 451 for guidance. The guide plate 452 and the bottom of the guide groove 451 are connected. A second compression spring 453 is arranged between the guide grooves 451, the guide groove 451 is slidingly matched with an inertia member 46 at the notch position, and a rolling member 461 is arranged at the lower end of the inertia member 46. The upper surface of the rotating drum 44 is coaxially provided with a first annular groove 441 and a second annular groove 442, and an intersection area 444 is arranged between the intersection of the first annular groove 441 and the second annular groove 442. The radius of the second annular groove 442 is greater than the radius of the first annular groove 441; along the circumferential direction; the bottom of the second annular groove 442 is evenly spaced with a plurality of protrusions 443, with reference to Fig.12 , Fig.14 In the initial state, the inertial member 46 is located above the first annular groove 441, and the rolling member 461 below is located in the first annular groove 441 and is kept in the second annular groove 442 under the elastic force of the second compression spring 453; the limiting member 43 is located above the connecting member 421 to limit the connecting member 421, refer to Fig.10At this time, the second clamping jaw 42 is spaced from the first clamping jaw 41. In this state, when the driven traction wheel 3 rotates, the rotating shaft 40 is driven to rotate through the transmission surface 33. When the rotating shaft 40 rotates, there is friction resistance between the end of the connecting member 421 and the end of the limiting member 43, and the end of the inertia member 46 contacts and cooperates with the first annular groove 441 through the rolling member 461, which is rolling friction. The rolling friction is much smaller than the friction between the limiting member 43 and the connecting member 421. Therefore, when the rotating shaft 40 rotates, the rotating drum 44 keeps In a stationary state, the driven disc 45 rotates with the rotating shaft 40, driving the inertia member 46 to move in the first annular groove 441. The inertia member 46 is subjected to centrifugal force. When the main traction wheel 2 drives the driven traction wheel 3 to rotate, the rotation speed is limited, and the centrifugal force on the inertia member 46 is small. The intersection area 444 limits the inertia member 46, so that the inertia member 46 remains in the first annular groove 441. When the main traction wheel 2 rotates to drive the driven traction wheel 3 to rotate to pull the second traction rope 14, the first traction rope 21 will also be pulled. When the second traction rope 14 is pulled to produce a certain elastic deformation, and the second traction rope 14 is suddenly separated from the driven traction wheel 3, the driven traction wheel 3 will be pulled to rotate rapidly under the resilience of the first traction rope 21 itself. At this time, the centrifugal force on the inertial member 46 increases instantaneously, and the inertial member 46 can squeeze the second elastic member to push the guide plate 452 to move, and move radially outward through the intersection area 444 into the second annular groove 442. Since the bottom of the second annular groove 442 has a protrusion 443, the protrusion 443 When the driven disk 45 continues to rotate, the resistance of the protrusion 443 on the inertia member 46 is greater than the resistance between the limit member 43 and the connecting member 421. When the driven disk 45 continues to rotate, it will drive the rotating drum 44 to rotate, thereby driving the limit member 43 to swing away from the connecting member 421. After the connecting member 421 loses the limit, the elastic force of the first compression spring 47 pushes the second clamping jaw 42 to move, and the first traction rope 21 is clamped between the first clamping jaw 41 and the second clamping jaw 42 to achieve the limit.

[0047] Further, it can be understood that when the rope clamping assembly 4 is arranged at the second threading port 1112, the limiter 43, the first clamping jaw 41 and the rotating shaft 40 are arranged on the second pressure plate 17, and the second clamping jaw 42 is arranged at the bottom of the second threading port 1112. The working principle is the same as above and will not be described here one by one. Those skilled in the art should understand it.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An endoscope hook diameter-changing pulling structure, characterized in that: include: A main traction wheel (2) is drivingly connected to the steering gear (1), and a first wire groove (20) is provided on the outer peripheral surface of the main traction wheel (2); A driven traction wheel (3), each main traction wheel (2) being provided with two corresponding ones, and a second wire groove (31) and a third wire groove (32) are provided at intervals on the outer peripheral surface of the driven traction wheel (3) along the axial direction, and the circumference of the second wire groove (31) is smaller than the circumference of the third wire groove (32); The second wire groove (31) is wound with a first traction rope (21), and the other end of the first traction rope (21) is connected to the first wire groove (20).

2. The endoscope hook diameter-changing pulling structure according to claim 1, characterized in that: Along the axial direction, the outer peripheral surface of the main traction wheel (2) is provided with two first line grooves (20) corresponding to the two driven traction wheels (3) at intervals.

3. The endoscope hook diameter-changing pulling structure according to claim 2, characterized in that: The second wire groove (31) of one driven traction wheel (3) is located above the first wire groove (20), and the second wire groove (31) of the other driven traction wheel (3) is located below the first wire groove (20).

4. The endoscope hook diameter-changing pulling structure according to claim 3, characterized in that: The invention comprises a backing plate (11), wherein along the axial direction of the driven traction wheel (3), the backing plate (11) comprises a first mounting surface (110) and a second mounting surface (111) having a height difference, and the two driven traction wheels (3) are rotatably arranged on the first mounting surface (110) and the second mounting surface (111), respectively.

5. The endoscope hook diameter-changing pulling structure according to claim 4, characterized in that: The first mounting surface (110) is provided with a first mounting groove (1101), and a third threading opening (1102) is provided on one side of the first mounting groove (1101); when the driven traction wheel (3) is rotatably disposed in the first mounting groove (1101), the inner circumference of the first mounting groove (1101) blocks the outer circumference of the third thread groove (32), and the second mounting surface (111) is provided with a first threading opening (112) corresponding to the first mounting groove (1101).

6. The endoscope hook diameter-changing pulling structure according to claim 5, characterized in that: The second mounting surface (111) is provided with a second mounting groove (1111), and the bottom surface of the second mounting groove (1111) is coaxially provided with a third mounting groove; when the driven traction wheel (3) is rotatably disposed in the second mounting groove (1111), the second wire groove (31) is located in the third mounting groove, and the third wire groove (32) is located in the second mounting groove (1111).

7. The endoscope hook diameter-changing pulling structure according to claim 6, characterized in that: A second threading opening (1112) is provided on one side of the second mounting groove (1111) close to the first mounting surface (110), and the bottom surface of the second threading opening (1112) is higher than the first mounting surface (110).

8. The endoscope hook diameter-changing pulling structure according to claim 7, characterized in that: It also comprises a support plate (10), the pad (11) and the main traction wheel (2) are both arranged on a first surface of the support plate (10), and the steering gear (1) is arranged on a surface opposite to the first surface.

9. The endoscope hook diameter-changing pulling structure according to claim 7, characterized in that: The third threading opening (1102) and the second threading opening (1112) are both provided with a rope clamping assembly (4), the rope clamping assembly (4) comprising a first clamping jaw (41) and a second clamping jaw (42) arranged opposite to each other; the first clamping jaw (41) and the second clamping jaw (42) are configured to move towards each other when the second traction rope (14) is separated from the third wire groove (32), so as to clamp and fix the second traction rope (14).

10. The endoscope hook diameter-changing pulling structure according to claim 9, characterized in that: The first clamping jaw (41) is arranged above the second clamping jaw (42), and a first compression spring (47) is arranged between the second clamping jaw (42) and the pad (11), and the first compression spring (47) can provide an elastic force for the second clamping jaw (42) to move closer to the first clamping jaw (41).

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