An ultra-short radius jetting device

Abstract

The present invention relates to the technical field of underground mining. An ultra-short radius jetting device discloses a bracket and a first driving assembly arranged on the bracket. A feed rod is slidably mounted on one side of the bracket. A guide sleeve is connected to the bottom end of the feed rod. A guide assembly is arranged in the guide sleeve. The guide assembly is used to provide positioning and guiding for the feeding of the feed rod. A centralizer is arranged on the surface of the feed rod. A second driving assembly is arranged below the centralizer. The second driving assembly provides a reaction force to the positioning assembly during the feeding process of the feed rod. The present invention provides a guiding effect on the feeding of the feed rod by arranging a wire assembly, thereby ensuring the verticality required by the feed rod in the subsequent feeding process, ensuring that the positioning plate is always in contact with the inner wall of the underground well, thereby ensuring that the feed rod is always concentric with the guide sleeve during the feeding process, and effectively avoiding collision and friction of the jetting end in the guide tube.

Description

Technical Field

[0001] The invention relates to the technical field of underground mining, in particular to an ultra-short radius jetting device. Background Art

[0002] Branch well drilling technology is a drilling technology that drills several branch wells in a single wellbore and returns to a single main wellbore. At present, there are many branch well drilling technologies, including casing window forging and milling sidetracking, preset window, open hole sidetracking, radial branch well method, expansion tube positioning sidetracking and intelligent branch well. Branch well drilling technology has many advantages: increasing the length of the wellbore in the reservoir, expanding the oil leakage area, improving the recovery rate, improving the oil flow dynamic profile, slowing down the drilling speed, providing gravity drainage channels, improving the vertical exploitation of oil and gas layers, improving the fracture penetration rate of fractured oil and gas reservoirs, economically exploiting marginal oil and gas reservoirs and heavy crude oil reservoirs, reusing the upper well section, reducing drilling costs, reducing the cost of platform construction due to the reduction of ground wellheads or offshore well slots, reducing the cost of oil well management and environmental protection, and improving economic benefits.

[0003] A method and device for hydraulic jet side-drilling radial branch wellbores with a publication number of "CN101429848B" includes: a first oil pipe, the outer diameter of which is smaller than the inner diameter of the casing set in the oil well, and the end of the first oil pipe is connected to a diverter; a second oil pipe, the outer diameter of which is smaller than the inner diameter of the first oil pipe, and the second oil pipe is connected to a side-drilling tool for side-drilling radial branch wellbores; the outer size of the diverter is smaller than the inner diameter of the casing, and the diverter has a through-channel connecting the top and the side wall, and the side-drilling tool is turned from the top of the diverter to the side wall through the through-channel. The present invention overcomes the known defects, can accurately and conveniently fix the diverter at a specified formation position, and the drilling position is accurate. It is particularly suitable for side-drilling of ultra-short radius wells, can be conveniently constructed on offshore platforms, avoids downhole accidents caused by downhole tools, effectively shortens the drilling cycle, saves drilling costs, reduces the labor intensity of workers, and improves construction effects, and has good market potential.

[0004] In the prior art, when an ultra-short radius horizontal wellbore is opened, the stabilizer and the guide sleeve need to be always kept concentrically arranged. In the subsequent process of penetrating the injection system, the injection end always causes collision and friction in the guide tube, shortening the service life of the entire injection device. In addition, for mining in deeper wells, it is necessary to increase the number of sections of the feed rod several times to extend the feed rod, which is more likely to cause damage to the injection system during the feeding process. Summary of the invention

[0005] The present invention provides an ultra-short radius injection device, which solves the problem that the prior art mentioned in the above background technology easily causes the injection end to collide and rub in the guide pipe, shortening the service life of the entire injection device. In addition, for mining in deeper wells, it is necessary to increase the number of sections of the feed rod multiple times to extend the feed rod, which is more likely to cause damage to the injection system during the feeding process.

[0006] The present invention provides the following technical solutions: an ultra-short radius jetting device, comprising a bracket and a first driving assembly arranged on the bracket, a feed rod is slidably mounted on one side of the bracket, a guide sleeve is connected to the bottom end of the feed rod, a guide assembly is arranged in the guide sleeve, and the guide assembly is used to provide positioning and guidance for the feeding of the feed rod; a centralizer is arranged on the surface of the feed rod, a second driving assembly is arranged below the centralizer, and the second driving assembly provides a reaction force to the positioning assembly during the feeding process of the feed rod;

[0007] The second drive assembly comprises a drive sleeve, the drive sleeve is arranged on the surface of the feed rod and below the centralizer, the drive sleeve has guide blocks arranged in an annular equidistant array, and the guide blocks have an inclined surface on one side close to the center;

[0008] The second driving assembly also includes a first push rod, one end of which is elastically connected to the feed rod, one end of which is fitted with an inclined surface, the feed rod has a double-ear seat in an annular equidistant array, a torsion spring pin is pinned inside the double-ear seat, a second push rod is fixedly connected to the surface of the torsion spring pin, and the top of the second push rod is fitted with one end of the first push rod.

[0009] As an optional solution of the ultra-short radius injection device described in the present invention, the first driving component includes a motor, a screw and a synchronous pulley connected to the output shaft end of the motor, a rotating sleeve is threadedly connected to the surface of the screw, and a synchronous pulley is also installed on the surface of the rotating sleeve. The two sets of synchronous pulleys are connected by a transmission belt, a fixed frame is provided on one side of the bracket, and the top end of the screw is rotatably connected to the fixed frame.

[0010] As an optional solution of the ultra-short radius injection device described in the present invention, a vertical plate is arranged on the top of the bracket, a guide wheel is rotatably installed on one side of the vertical plate, a U-shaped annular groove is opened in the guide wheel, and the guide wheel and the feed rod surface are arranged in close contact.

[0011] As an optional solution of the ultra-short radius injection device described in the present invention, the guide assembly includes a positioning plate that is rotated and connected to the guide sleeve, the guide sleeve is provided with a through groove in an annular manner, two groups of connecting blocks are symmetrically arranged at the bottom of the positioning plate, the inner wall of the through groove is connected to a support seat, the connecting block is pin-connected to the support seat through a pin shaft, and a torsion spring is provided on the outside of the pin shaft.

[0012] As an optional solution of the ultra-short radius injection device described in the present invention, the inner wall of the positioning plate is provided with support blocks in an equidistant array, a thumbwheel is rotatably installed between two adjacent groups of the support blocks, the thumbwheel surface is provided with material-moving ridges in an annular array, an inclination angle is set between the material-moving ridges and the thumbwheel, and the inclination angle is 5°-12°.

[0013] As an optional solution of the ultra-short radius injection device described in the present invention, wherein: a reaction seat is provided in the guide sleeve, a connecting hole is opened in the reaction seat, the cross-sectional surface of the reaction seat is set to a conical structure, a slide groove is opened in an annular shape at equal intervals in the reaction seat, a reaction plate is slidably connected in the slide groove, and a second spring is connected between the reaction plate and the inner wall of the slide groove.

[0014] As an optional solution of the ultra-short radius injection device described in the present invention, wherein: the reaction plate is symmetrically provided with wing plates on the side away from the slide groove, a guide groove is provided between the two groups of the wing plates, the guide groove and the pulley are matched, and the material-pulling convex strip and the guide groove are fitted.

[0015] As an optional solution of the ultra-short radius injection device described in the present invention, a positioning ring and a fixing ring are installed on the surface of the first push rod, a first spring is connected between the positioning ring and the fixing ring, and the positioning ring is fixedly connected to the inner wall of the feed rod.

[0016] As an optional solution of the ultra-short radius injection device described in the present invention, a protrusion is provided on the top of the positioning plate, and ear plates are provided in a circular equidistant array on the top of the outer wall of the guide sleeve. A third push rod is also connected between two adjacent groups of ear plates through a torsion spring pin, and the top end of the third push rod and the bottom end of the second push rod are arranged in close contact.

[0017] The present invention has the following beneficial effects:

[0018] 1. The ultra-short radius injection device is provided with a guide wheel, in which a U-shaped annular groove is provided. The U-shaped annular groove in the guide wheel is arranged to fit the surface of the feed rod, so as to provide a guide for the feed rod to feed, thereby ensuring the verticality required by the feed rod in the subsequent feeding process;

[0019] 2. The ultra-short radius injection device, by setting a first driving assembly, sequentially includes two sets of synchronous pulleys, a transmission belt and a rotating sleeve rotating in the bracket, and uses a motor to drive the rotating sleeve to rotate, which can drive the screw to rotate and drive the fixed frame, the vertical plate and the guide wheel to rise or fall, so as to adjust the position of the guide wheel according to the production needs on site, and further ensure the verticality of the feeding rod;

[0020] 3. The ultra-short radius jet device, by setting a guide assembly, includes a positioning plate that can be flipped at a certain angle, and utilizes the characteristic that the positioning plate 13 can be opened outward at a certain angle to ensure that the positioning plate is always in contact with the inner wall of the well, thereby ensuring that the feed rod is always concentric with the guide sleeve during the feeding process, and also ensuring the verticality in the feeding direction, effectively avoiding collision and friction of the jet end in the guide tube;

[0021] 4. This ultra-short radius jet device, by setting a second drive component, is provided with a drive sleeve on the surface of the feed rod. When the feed rod moves downward, it is ensured that one end of the first push rod is in contact with the inclined surface, and the other end is in contact with the second push rod pinned in the feed rod. When the feed rod needs to be lengthened, the elastic sliding rod of the first push rod is used to drive the sleeve and the feed rod, that is, during the feeding process of the new feed rod, the slope of the inclined surface increases, and the first push rod is affected by the inclined surface to push the second push rod to flip around the torsion spring pin, and then cooperates with the third push rod to drive the protrusion on the top of the positioning plate to tighten the positioning plate inward; otherwise, the tightening force on the positioning plate is eliminated, so that the positioning plate and the inner wall of the well are continuously in contact, further increasing the verticality and concentricity of the entire jet device in the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the feed rod and the guide sleeve connecting the column of the present invention.

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the guide sleeve of the present invention.

[0025] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of part A.

[0026] Figure 5 For the present invention Figure 3 The enlarged structural diagram of part B is shown in the figure.

[0027] Figure 6 It is an exploded view of the positioning plate pin connection structure of the present invention.

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure of the reaction seat of the present invention.

[0029] Figure 8 It is a schematic diagram of the structure of the second driving component of the present invention.

[0030] Fig. 9 For the present invention Figure 8 Enlarged schematic diagram of part C in the middle.

[0031] Fig.10It is a schematic diagram of driving the second push rod and the third push rod of the present invention.

[0032] In the figure: 1, bracket; 2, motor; 3, transmission belt; 4, screw; 5, synchronous pulley; 6, fixed frame; 7, feed rod; 8, centralizer; 9, drive sleeve; 10, guide sleeve; 11, guide; 12, strong ring; 13, positioning plate; 14, reaction seat; 15, support block; 16, dial wheel; 17, connecting block; 18, support seat; 19, guide block; 20, inclined surface; 21, through groove; 22, first push rod; 23. Positioning ring; 24. First spring; 25. Fixing ring; 26. Second push rod; 27. Double-ear seat; 28. Torsion spring pin; 29. ​​Third push rod; 30. Ear plate; 31. Protrusion; 32. Connecting hole; 33. Pin shaft; 34. Torsion spring; 35. Slide groove; 36. Reaction plate; 37. Second spring; 38. Wing plate; 39. Guide groove; 40. Rotating sleeve; 41. Vertical plate; 42. Guide wheel; 43. Material-discharging convex strip. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] For example, see Figures 1 to 8 The present invention discloses an ultra-short radius injection device, including a bracket 1 and a first driving assembly arranged on the bracket 1, a feed rod 7 is slidably installed on one side of the bracket 1, a vertical plate 41 is arranged on the top of the bracket 1, a guide wheel 42 is rotatably installed on one side of the vertical plate 41, a U-shaped annular groove is opened in the guide wheel 42, and the guide wheel 42 and the feed rod 7 are arranged to fit the surface.

[0035] In this embodiment, the feed rod 7 is transported into the well during the pressure application process of the external hydraulic system, wherein the bottom of the feed rod 7 is connected to a guide sleeve 10, and a guide 11 is arranged in the guide sleeve 10. The formation jet nozzle finally enters the guide 11 along the feed rod 7 and the guide sleeve 10. While spraying the formation rock-breaking jet, the formation jet nozzle enters the formation together with the feed rod 7 to perform side drilling and form a radial branch wellbore. A set of rotatable guide wheels 42 is arranged at the feed end of the feed rod 7 to provide a guide for the feeding of the feed rod 7. In this embodiment, one set of guide wheels 42 is arranged, but in actual operation, multiple sets of guide wheels 42 can be arranged according to the diameter of the feed rod 7 to ensure the verticality of the feeding of the feed rod 7.

[0036] It should be noted that the matching mode and working principle of the formation jet nozzle and the feed rod 7 are all existing technologies, which are well known to those skilled in the art and will not be described in detail in this embodiment.

[0037] The first driving assembly includes a motor 2, a screw 4 and a synchronous pulley 5 connected to the output shaft end of the motor 2. A rotating sleeve 40 is threadedly connected to the surface of the screw 4, and a synchronous pulley 5 is also installed on the surface of the rotating sleeve 40. The two sets of synchronous pulleys 5 are connected by a transmission belt 3. A fixed frame 6 is provided on one side of the bracket 1, and the top end of the screw 4 is rotatably connected to the fixed frame 6.

[0038] In this embodiment, the bottom end of the screw 4 is fixed and the screw 4 is ensured to be able to rotate, and the motor 2 is started to drive the synchronous pulley 5 and the transmission belt 3 between the two sets of synchronous pulleys 5 for transmission. Since the surface of the screw 4 is threadedly connected with a rotating sleeve 40, and a fixed frame 6 is slidably arranged on the bracket 1, the screw 4 can be driven to rotate under the drive of the transmission belt 3, thereby driving the fixed frame 6, the vertical plate 41 and the guide wheel 42 to rise or fall, so as to adjust the position of the guide wheel 42 according to the production needs on site, and further ensure the verticality of the feeding of the feed rod 7.

[0039] Example 2: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 8 The bottom end of the feed rod 7 is connected to a guide sleeve 10, and a guide assembly is arranged in the guide sleeve 10. The guide assembly is used to provide positioning and guiding for the feeding of the feed rod 7; the guide assembly includes a positioning plate 13 which is connected to the guide sleeve 10, and a through groove 21 is provided in an annular manner in the guide sleeve 10. Two groups of connecting blocks 17 are symmetrically arranged at the bottom of the positioning plate 13, and a support seat 18 is connected to the inner wall of the through groove 21. The connecting block 17 is pinned to the support seat 18 through a pin shaft 33, and a torsion spring 34 is provided on the outside of the pin shaft 33.

[0040] In this embodiment, a through groove 21 is opened in the guide sleeve 10, and a positioning plate 13 that can be flipped to a certain angle is arranged in the through groove 21. Specifically, a support seat 18 is arranged at the bottom of the through groove 21, and a connecting block 17 is symmetrically arranged at the bottom end of the positioning plate 13. The connecting block 17 and the support seat 18 are pin-connected, and the pin-connected position passes through the support seat 18. A torsion spring 34 is arranged on the surface of the support seat 18 to ensure that the positioning plate 13 can be opened outward at a certain angle. The specific outward turning angle can be adjusted according to the inner diameter of the downhole traveling space to ensure that the positioning plate 13 is always in contact with the inner wall of the downhole, thereby ensuring that the feed rod 7 always remains concentric with the guide sleeve 10 during the feeding process, and also ensuring the verticality in the feeding direction, effectively avoiding collision and friction of the injection end in the guide tube.

[0041] It should be noted that, since a through groove 21 is provided in the guide sleeve 10 , a force ring 12 is installed between the guide sleeve 10 and the feed rod 7 to ensure the support strength of the guide sleeve 10 .

[0042] A reaction seat 14 is provided in the guide sleeve 10, a connecting hole 32 is opened in the reaction seat 14, the cross-sectional surface of the reaction seat 14 is set to a conical structure, a sliding groove 35 is opened in an annular manner at equal intervals in the reaction seat 14, a reaction plate 36 is slidably connected in the sliding groove 35, and a second spring 37 is connected between the reaction plate 36 and the inner wall of the sliding groove 35.

[0043] In this embodiment, a reaction seat 14 is provided inside the guide sleeve 10, and multiple groups of reaction plates 36 matching the positioning plate 13 are provided inside the reaction seat 14. By utilizing the gap between the feed rod 7 and the inner wall of the well, the second spring 37 is used to drive the reaction plate 36 to expand outward or contract in the box, thereby pushing the positioning plate 13, so that the positioning plate 13 is always in contact with the well wall, further ensuring the verticality of the injection device in the feeding direction.

[0044] The reaction plate 36 is symmetrically provided with a wing plate 38 on one side away from the slide groove 35, and a guide groove 39 is provided between two groups of wing plates 38. The inner wall of the positioning plate 13 is provided with support blocks 15 in an equidistant array, and a thumbwheel 16 is rotatably installed between two adjacent groups of support blocks 15. The thumbwheel 16 surface is provided with a ring array of material-diverting convex strips 43, and an inclination angle is provided between the material-diverting convex strips 43 and the thumbwheel 16, and the inclination angle is 5°-12°. The guide groove 39 is matched with the thumbwheel 16, and the material-diverting convex strips 43 and the guide groove 39 are provided in close contact.

[0045] Specifically, a slide groove 35 is opened on one side of the reaction plate 36, and wing plates 38 are arranged on both sides of the slide groove 35, and the guide groove 39 between the two sets of wing plates 38 is used to limit the thumb wheel 16 on one side of the positioning plate 13. During the feeding process of the feed rod 7, the material-pickup ridge 43 arranged on the surface of the thumb wheel 16 rolls in the guide groove 39, wherein the inclination angle of the material-pickup ridge 43 is set to 5°-12°, preferably 10°, and the inclination direction of the material-pickup ridge 43 is in the same direction as the feeding direction, thereby reducing the friction generated by the feed rod 7 during the feeding process as much as possible.

[0046] Example 3: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 8, a centralizer 8 is arranged on the surface of the feed rod 7, and a second drive assembly is arranged below the centralizer 8. The second drive assembly provides a reaction force to the positioning assembly during the feeding process of the feed rod 7. The second drive assembly includes a drive sleeve 9, which is arranged on the surface of the feed rod 7 and below the centralizer 8. The drive sleeve 9 has guide blocks 19 in an annular equidistant array inside the drive sleeve 9, and a slope 20 is provided on the side of the guide block 19 close to the center; the second drive assembly also includes a first push rod 22, one end of the first push rod 22 is elastically connected to the feed rod 7, one end of the first push rod 22 is fitted with the slope 20, the feed rod 7 has a double-ear seat 27 in an annular equidistant array, a torsion spring pin 28 is pinned inside the double-ear seat 27, a second push rod 26 is fixedly connected to the surface of the torsion spring pin 28, and the top of the second push rod 26 is fitted with one end of the first push rod 22.

[0047] In this embodiment, a driving sleeve 9 is provided on the surface of the feed rod 7, and a guide block 19 with a slope 20 is provided in the driving sleeve 9. When the feed rod 7 moves downward, the first push rod 22 in the feed rod 7 is always slidably inserted into the side wall of the feed rod 7 under the action of the first spring 24. At the same time, one end of the first push rod 22 is in contact with the slope 20, and the other end is in contact with the second push rod 26 pinned in the feed rod 7. When the feed rod 7 needs to be lengthened, another section of the feed rod 7 is inserted from outside the well to the feeding direction of the feed rod 7. In order to avoid the concentricity failing to meet the requirements, the first push rod 22 is elastically slid between the driving sleeve 9 and the feed rod 7, that is, during the feeding process of the new feed rod 7, the slope of the slope 20 increases, and the first push rod 22 is affected by the slope 20 to push the second push rod 26 to flip around the torsion spring pin 28.

[0048] A protrusion 31 is provided on the top of the positioning plate 13, and ear plates 30 are arranged in a circular equidistant array on the top of the outer wall of the guide sleeve 10. A third push rod 29 is also pinned between two adjacent groups of ear plates 30 through a torsion spring pin 28, and the top end of the third push rod 29 and the bottom end of the second push rod 26 are arranged in a close fit.

[0049] During the flipping process, the bottom end of the second push rod 26 pushes the third push rod 29, and the third push rod 29 drives the protrusion 31 on the top of the positioning plate 13 to tighten the positioning plate 13 inward; conversely, the tightening force on the positioning plate 13 is eliminated, so that the positioning plate 13 and the inner wall continue to fit together, further increasing the verticality and concentricity of the entire injection device in the well.

[0050] A positioning ring 23 and a fixing ring 25 are installed on the surface of the first push rod 22 , a first spring 24 is connected between the positioning ring 23 and the fixing ring 25 , and the positioning ring 23 is fixedly connected to the inner wall of the feed rod 7 .

[0051] In this embodiment, the first push rod 22 is elastically and slidably connected to the feed rod 7 by using a positioning ring 23 and a fixing ring 25. Following the feeding of the feed rod 7, the flipping angle of the positioning plate 13 is controlled, which can not only ensure the concentricity requirement of the feed rod 7, but also avoid the friction between the guide sleeve 10 and the well wall, thereby extending the service life of the entire injection device.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An ultra-short radius jetting device, comprising a bracket (1) and a first drive assembly arranged on the bracket (1), characterized in that: A feed rod (7) is slidably mounted on one side of the bracket (1), a guide sleeve (10) is connected to the bottom end of the feed rod (7), a guide assembly is arranged inside the guide sleeve (10), and the guide assembly is used to provide positioning and guidance for the feeding of the feed rod (7); A centralizer (8) is arranged on the surface of the feed rod (7), a second drive assembly is arranged below the centralizer (8), the second drive assembly provides a reaction force to the positioning assembly during the feeding process of the feed rod (7), the second drive assembly comprises a drive sleeve (9), the drive sleeve (9) is arranged on the surface of the feed rod (7) and below the centralizer (8), guide blocks (19) are arranged in an annular equidistant array inside the drive sleeve (9), and a slope (20) is provided on one side of the guide block (19) close to the center; The second driving assembly further comprises a first push rod (22), one end of the first push rod (22) being elastically connected to the inside of the feed rod (7), one end of the first push rod (22) being arranged in close contact with the inclined surface (20), the feed rod (7) having a double-ear seat (27) in an annular equidistant array, a torsion spring pin (28) being pinned inside the double-ear seat (27), a second push rod (26) being fixedly connected to the surface of the torsion spring pin (28), and the top of the second push rod (26) being arranged in close contact with one end of the first push rod (22).

2. An ultra-short radius injection device according to claim 1, characterized in that: The first driving assembly comprises a motor (2), a screw (4) and a synchronous pulley (5) connected to the output shaft end of the motor (2); a rotating sleeve (40) is threadedly connected to the surface of the screw (4); a synchronous pulley (5) is also mounted on the surface of the rotating sleeve (40); two sets of synchronous pulleys (5) are connected to each other by a transmission belt (3); a fixing frame (6) is provided on one side of the bracket (1); and the top end of the screw (4) is rotatably connected to the fixing frame (6).

3. An ultra-short radius injection device according to claim 1, characterized in that: A vertical plate (41) is arranged on the top of the bracket (1), a guide wheel (42) is rotatably mounted on one side of the vertical plate (41), a U-shaped annular groove is provided in the guide wheel (42), and the guide wheel (42) and the feed rod (7) are arranged to fit each other on the surface.

4. The ultra-short radius jetting device according to claim 1, characterized in that: The guide assembly comprises a positioning plate (13) which is connected to the guide sleeve (10). The guide sleeve (10) is provided with a through groove (21) in an annular shape. Two groups of connecting blocks (17) are symmetrically arranged at the bottom of the positioning plate (13). The inner wall of the through groove (21) is connected to a support seat (18). The connecting block (17) is pin-connected to the support seat (18) via a pin shaft (33). A torsion spring (34) is provided on the outside of the pin shaft (33).

5. An ultra-short radius jetting device according to claim 4, characterized in that: The inner wall of the positioning plate (13) is provided with support blocks (15) in an equidistant array, a thumbwheel (16) is rotatably mounted between two adjacent groups of the support blocks (15), a surface of the thumbwheel (16) is provided with material-moving convex strips (43) in an annular array, an inclination angle is provided between the material-moving convex strips (43) and the thumbwheel (16), and the inclination angle is 5°-12°.

6. An ultra-short radius jetting device according to claim 5, characterized in that: A reaction seat (14) is provided in the guide sleeve (10), a connecting hole (32) is provided in the reaction seat (14), a cross-sectional surface of the reaction seat (14) is arranged to be a conical structure, a slide groove (35) is provided in the reaction seat (14) in an annular manner and equidistantly, a reaction plate (36) is slidably connected in the slide groove (35), and a second spring (37) is connected between the reaction plate (36) and the inner wall of the slide groove (35).

7. An ultra-short radius jetting device according to claim 6, characterized in that: A wing plate (38) is symmetrically arranged on one side of the reaction plate (36) away from the slide groove (35), a guide groove (39) is arranged between two groups of the wing plates (38), the guide groove (39) and the thumbwheel (16) are matched, and the material-moving convex strip (43) and the guide groove (39) are fitted.

8. An ultra-short radius jetting device according to claim 7, characterized in that: A positioning ring (23) and a fixing ring (25) are mounted on the surface of the first push rod (22); a first spring (24) is connected between the positioning ring (23) and the fixing ring (25); and the positioning ring (23) is fixedly connected to the inner wall of the feed rod (7).

9. An ultra-short radius jetting device according to claim 8, characterized in that: A protrusion (31) is provided on the top of the positioning plate (13), and ear plates (30) are arranged in an annular equidistant array on the top of the outer wall of the guide sleeve (10). A third push rod (29) is also connected between two adjacent groups of the ear plates (30) via a torsion spring pin (28), and the top end of the third push rod (29) is arranged to fit the bottom end of the second push rod (26).

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