Hollow high-strength straight rod

Abstract

The present application relates to the technical field of connecting device, and discloses a hollow high-strength straight rod, which comprises a rod body and an inner cylinder, the inner cylinder is coaxially arranged inside the rod body, one end of the inner cylinder is provided with a connecting sleeve, the other end is provided with a plug-in seat, a valve core assembly is arranged inside the inner cylinder, the valve core assembly comprises a middle shaft, a core shaft and a nozzle seat, the nozzle seat comprises a connecting rod and a seat head, a cavity is arranged inside the connecting rod, one end of the middle shaft is connected in the cavity, a plurality of spray holes are arranged on the end face of the seat head and communicate with the cavity, and the core shaft is inserted into the middle shaft through the connecting sleeve. The valve core assembly can produce continuous rotation under the driving of fluid, realize spiral pressurization of fluid, improve the pressure of fluid, the positioning pin is clamped in the positioning groove, the inner cylinder is quickly installed and stably positioned on the rod body, the clamping and positioning of the inner cylinder by the positioning pin can be released through the unlocking groove, the inner cylinder is quickly disassembled, the rod body is replaced, and waste caused by the whole set being scrapped is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of connecting device, in particular to a hollow high-strength straight rod. BACKGROUND

[0002] The drilling machine is a tool or mechanical equipment commonly used in exploration or mineral resources development, and mainly functions to drive the drilling tool to break the rock at the bottom of the hole, and to lower or lift the drilling tool in the hole, which can be used to drill core, mineral core, rock debris, gaseous samples, liquid samples, etc., to explore the underground geological and mineral resources, etc. With the increase of the mining depth, it is necessary to use a connecting rod to extend, and the drilling machine and the drill bit are connected through the connecting rod. The connecting rod is in a hollow form, and high-pressure fluid is transported through the internal hollow channel of the connecting rod and sprayed through the drill bit to assist in drilling and slag removal. However, with the increase of the drilling depth, the pressure of the fluid cannot be guaranteed, which restricts the drilling efficiency.

[0003] Chinese patent CN106014303A discloses a hydraulic cyclone pressurizing device and a pressurizing method, which mainly comprises a pressurizing device body, a supporting connection mechanism, a thrust aligning roller bearing unit, a slip ring combined sealing unit and a spiral pressurizing rotor. The thrust aligning roller bearing unit and the slip ring combined sealing unit are installed at the upper and lower ends of the spiral pressurizing rotor, and the two ends of the spiral pressurizing rotor are connected with the upper and lower positioning flow guide rings of the supporting connection mechanism through the rotor back cap, and then fixed in the water eye of the pressurizing device body. However, the scheme adopts a single channel structure, and the water eye through hole in the pressurizing device body is only used for the transportation and pressurization of the drilling mud. The slag removal channel is between the outside of the pressurizing device body and the rock wall, and the slag removal channel is easy to be blocked, so that the drilling cannot be carried out. Moreover, the scheme drives a single spiral pressurizing rotor to rotate and pressurize by the drilling mud, and the pressurizing effect is not significant, which cannot meet the working requirements.

[0004] In addition, Chinese utility model patent CN206091890U discloses a YT hollow high-strength straight rod, which comprises a sleeve and an inner tube. The sleeve is sleeved outside the inner tube and coaxially arranged with the inner tube. The front end of the sleeve is in a boss shape, and the inner wall of the tail end of the sleeve is consistent with the front end. The inner tube is in a hollow structure, the tail end of the inner tube is in a boss shape, and the inner wall of the front end of the inner tube is consistent with the tail end. A groove is arranged in the middle segment of the outer wall of the inner tube, a flat key is clamped in the groove, and the flat key is fixed to the inner wall of the sleeve. A spiral is arranged on the outer wall of the sleeve. The wall thickness of the front end and the tail end of the sleeve is half of the wall thickness of the middle segment. The thickness of the flat key is greater than the distance between the groove and the inner wall of the sleeve. The flat key and the sleeve are fixed by welding through welding points. However, after the flat key and the sleeve are welded, the inner tube cannot be taken out from the sleeve because the flat key is clamped in the groove on the inner tube. In the case that the sleeve is worn out after long-term use and the inner tube can still be used, the inner tube cannot be taken out, so the whole can only be scrapped, which causes waste and increases the cost.

[0005] Therefore, it is necessary to propose an improvement of hollow high-strength straight rod to overcome the defects of the prior art. SUMMARY

[0006] The purpose of the present application is to solve the problems in the prior art and provide a hollow high-strength straight rod.

[0007] The technical scheme of the present application is:

[0008] A hollow high-strength straight rod comprises a rod body and an inner cylinder, both of which are internally hollow, the inner cylinder is coaxially and detachably arranged inside the rod body, a connecting sleeve is detachably arranged at one end of the inner cylinder, a plug-in seat is detachably arranged at the other end of the inner cylinder, a rotatable valve core assembly is arranged inside the inner cylinder, the valve core assembly comprises an intermediate shaft, a core shaft and a nozzle seat, the nozzle seat comprises a connecting rod and a seat head, a cavity is arranged inside the connecting rod, the intermediate shaft is detachably connected in the cavity at one end, a plurality of spray holes are arranged on the end face of the seat head, the spray holes are arranged obliquely from the edge of the seat head to the center of the seat head and are communicated with the cavity, the core shaft is inserted into the intermediate shaft through the connecting sleeve, and a bearing set is sleeved on the intermediate shaft.

[0009] The rod body and the inner cylinder are connected in a detachable manner, when the rod body is severely worn, the inner cylinder can be quickly detached to replace the rod body, avoiding the whole being scrapped, and both are processed in a modular manner, so that multiple sets can be arranged during use, the interchangeability is high, the processing difficulty is reduced, the cost is saved, during use, the fluid flows into the connecting sleeve, pushes the core shaft to be pressed on the connecting sleeve to form an axial self-sealing, the fluid sequentially flows through the core shaft and the intermediate shaft into the cavity and is sprayed from the spray holes, the core shaft, the intermediate shaft and the nozzle seat are driven to rotate continuously during the spraying process, so that multiple spiral fluid beams are generated to jointly act, the fluid is subjected to multiple spiral composite pressurization, the pressurization effect is obvious, the smooth progress of drilling work is ensured, the overall structure is simple, the strength is high, the application range is wide, and the use is convenient.

[0010] Preferably, a plurality of guide blocks are uniformly arranged on the outer circumferential surface of one end of the inner cylinder, positioning screw holes are arranged on the guide blocks, a plurality of positioning blocks are uniformly arranged on the outer circumference of the other end of the inner cylinder, a positioning pin and an elastic element are arranged in the positioning block, the elastic element is clamped between the positioning pin and the inner bottom wall of the positioning block, and the outer diameters of the guide blocks and the positioning blocks match the inner diameter of the rod body.

[0011] The guide blocks and the positioning blocks can be supported on the inner wall of the rod body, the inner cylinder is stably installed in the rod body, and the elastic element pushes the positioning pin to protrude out of the positioning block to position the inner cylinder.

[0012] Preferably, a positioning groove matched with the positioning pin and a plurality of unlocking grooves matched with the positioning blocks are arranged on the inner circumferential surface of one end of the rod body, the plurality of unlocking grooves are uniformly arranged on the rod body, one end of the unlocking groove is communicated with the positioning groove, and the other end of the unlocking groove is smoothly transitioned to the inner side wall of the rod body in a spiral shape.

[0013] The positioning pin is extended under the action of the elastic member and clamped in the positioning groove, achieving installation and positioning of the inner cylinder, the depth of the unlocking groove gradually decreases from the position of the positioning groove along the spiral direction until the inner diameter of the inner cylinder, the positioning pin can be clamped in the unlocking groove, the positioning pin gradually retracts to the inside of the positioning block under the compression of the elastic member, until the retraction is flush with the inner side wall of the inner rod body, the locking of the positioning pin on the inner cylinder is released, and the inner cylinder can be taken out of the rod body, which is simple and convenient to operate.

[0014] Preferably, the bearing set comprises at least one first bearing and at least one second bearing, and the intermediate shaft is provided with a shaft shoulder, and the first bearing and the second bearing are arranged on both sides of the shaft shoulder, respectively.

[0015] The bearing set supports the intermediate shaft, ensures the rotation of the intermediate shaft around the axis, and prevents the axial movement of the intermediate shaft.

[0016] Preferably, one end of the rod body is provided with an internal thread, the other end of the rod body is provided with an external thread, the internal thread is matched with the external thread, and the internal thread and the external thread are taper threads or straight threads.

[0017] When the multiple sets of straight rods are connected with each other, the adjacent rod bodies are connected through threads.

[0018] Preferably, the connecting sleeve and the plug-in seat are matched, the connecting sleeve can be connected with the plug-in seat in a plug-in mode, and a plurality of grooves are arranged on the outer circumference of the end of the connecting sleeve away from the inner cylinder and along the axial direction.

[0019] When the multiple sets of straight rods are connected with each other, the adjacent inner cylinders are connected through the connecting sleeve and the plug-in seat in a plug-in mode, and a sealing ring is arranged in the groove to enhance the sealing performance of the connection.

[0020] Preferably, a plurality of sealing ring grooves are arranged on the circumferential surface of the mandrel inside the intermediate shaft and along the axial direction.

[0021] When the fluid flows, the sealing ring groove can form a water storage type self-sealing, thereby maintaining the fluid pressure.

[0022] Preferably, an auxiliary positioning hole is arranged on the rod body, the auxiliary positioning hole is matched with the positioning screw hole, and a positioning screw is arranged in the auxiliary positioning hole.

[0023] The auxiliary connection of the rod body and the inner cylinder is realized through the positioning screw, and the stability of the connection is increased.

[0024] Preferably, a spiral reinforcing rib is arranged on the outer circumferential surface of the rod body, and the number of the reinforcing rib is 1-3.

[0025] The reinforcing rib enhances the overall structural strength and can reduce the drilling resistance in the use process.

[0026] The number of the spray holes is preferably set to 2-6;

[0027] The number of the spray holes can be determined according to actual use conditions to achieve optimal rotational flow supercharging effect and save processing cost.

[0028] In summary, the valve core assembly arranged in the inner cylinder can be continuously rotated under the driving of fluid, the fluid is subjected to multi-spiral composite supercharging, the pressure of the fluid is increased, the supercharging effect is obvious, the stability of the fluid pressure is maintained, the smooth drilling work is ensured, the positioning pin is clamped in the positioning groove through the elastic member, the quick installation and stable positioning of the inner cylinder on the rod body are realized, when the rod body is seriously worn, the clamping and positioning of the inner cylinder by the positioning pin can be released through the depth-gradually-changing unlocking groove, the inner cylinder is quickly disassembled, the rod body is replaced, the waste caused by the whole set being scrapped is avoided, the use cost is reduced, the overall structural strength is high, the operation is simple, and the application is beneficial to promotion. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a cross-sectional structure schematic view of the present application;

[0030] Figure 2 It is a three-dimensional structure schematic view of the present application;

[0031] Figure 3 It is a three-dimensional structure schematic view of the present application; Figure 1 It is a three-dimensional structure schematic view of the present application;

[0032] Figure 4 It is a rod body structure schematic view of the present application;

[0033] Figure 5 It is an inner cylinder structure schematic view of the present application;

[0034] Figure 6 It is a nozzle seat structure schematic view of the present application.

[0035] In the figure, 1 is a rod body, 11 is an outer thread, 12 is an inner thread, 13 is a reinforcing rib, 14 is an auxiliary positioning hole, 15 is a positioning groove, 16 is an unlocking groove, 2 is an inner cylinder, 21 is a guide block, 22 is a positioning screw hole, 23 is a positioning screw, 24 is a positioning block, 25 is a positioning pin, 26 is an elastic member, 3 is a connecting sleeve, 31 is a groove, 4 is a plug-in seat, 5 is an intermediate shaft, 51 is a shaft shoulder, 6 is a mandrel, 61 is a sealing ring groove, 7 is a nozzle seat, 71 is a connecting rod, 72 is a seat head, 73 is a cavity, 74 is a spray hole, 8 is a first bearing, and 9 is a second bearing. DETAILED DESCRIPTION

[0036] In order to make the technical means, technical features, invention purposes and technical effects of the present application easy to understand, the present application is further described below in combination with specific drawings.

[0037] Reference Figures 1-6 A hollow high-strength straight rod comprises a rod body 1 and an inner cylinder 2, both of which are hollow inside, the inner cylinder 2 is installed inside the rod body 1, the inner cylinder 2 is coaxially installed with the rod body 1, a slag discharge channel is formed between the inner cylinder 2 and the rod body 1, the hollow inner cylinder 2 is used for conveying fluid to assist work, the inner cylinder 2 and the rod body 1 are connected in a detachable manner, the inner cylinder 2 can be quickly detached from the rod body 1, avoiding the whole being scrapped due to serious wear of the rod body 1, causing waste and cost increase, a helical reinforcing rib 13 is processed on the outer circumference of the rod body 1, the number of the reinforcing rib 13 is 1-2, which is used to enhance the strength of the rod body 1 and improve the service life of the rod body 1, an inner thread 12 is processed at one end of the rod body 1, an outer thread 11 is processed at the other end of the rod body 1, the outer thread 11 and the inner thread 12 are matched, according to the use requirement, the outer thread 11 and the inner thread 12 can be processed into taper threads or straight threads, a connecting sleeve 3 is connected to one end of the inner cylinder 2 through threads, a plug-in seat 4 is connected to the other end of the inner cylinder 2 through threads, the connecting sleeve 3 and the plug-in seat 4 are matched, when multiple rods of the present application are connected with each other, the outer thread 11 of one rod body 1 is connected with the inner thread 12 of an adjacent rod body 1, correspondingly, the connecting sleeve 3 on one inner cylinder 2 is plugged into the plug-in seat 4 of an adjacent inner cylinder 2, in order to ensure the sealing performance after plugging, a plurality of grooves 31 are processed on the outer circumference of the end of the connecting sleeve 3 away from the inner cylinder 2 along the axial direction, a sealing ring is installed in the groove 31, ensuring the sealing reliability of the connection between the connecting sleeve 3 and the plug-in seat 4.

[0038] Reference Figure 1 、 Figure 5 and Figure 6The inner cylinder 2 is internally provided with a valve core assembly, and the fluid flows through the valve core assembly, and under the action of the fluid itself, the valve core assembly can continuously rotate in the inner cylinder 2, and the rotation of the valve core assembly generates a rotational flow, realizes rotational flow supercharging of the fluid, keeps the pressure of the fluid stable, and the valve core assembly comprises an intermediate shaft 5, a core shaft 6 and a nozzle seat 7, the nozzle seat 7 comprises an integrally processed connecting rod 71 and a seat head 72, the inside of the connecting rod 71 is processed into a cavity 73, a plurality of uniformly distributed spray holes 74 are processed on the end face of the seat head 72, the spray holes 74 are obliquely processed, gradually inclined from the edge of the seat head 72 to the center of the seat head 72 and communicated with the cavity 73, the number of the spray holes 74 is 2-6, the specific number can be processed according to the actual use condition, and the optimal rotational flow supercharging effect is achieved under the condition that the use requirement is met, the processing difficulty is reduced, one end of the intermediate shaft 5 is threadedly connected in the cavity 73, one end of the core shaft 6 is inserted into the intermediate shaft 5 through the connecting sleeve 3, a plurality of sealing ring grooves 61 are axially processed on the circumferential surface of the core shaft 6 inside the intermediate shaft 5, the fluid is connected from the connecting sleeve 3, the fluid pressure pushes the core shaft 6 to be tightly pressed on the connecting sleeve 3 to form an axial self-sealing, which reduces the leakage of the fluid into the inner cylinder 2, the fluid enters the sealing ring groove 61 to form a water storage type self-sealing, which ensures the reliability of the sealing between the core shaft 6 and the center shaft, and is beneficial to the maintenance of the fluid pressure, a bearing set is sleeved on the intermediate shaft 5 for supporting the intermediate shaft 5 and ensuring the smooth rotation of the intermediate shaft 5 around the axis, and the axial movement of the intermediate shaft 5 can also be prevented through the shaft shoulder 51 processed on the intermediate shaft 5, the bearing set comprises at least one first bearing 8 and at least one second bearing 9, and in the embodiment, one first bearing 8 and two second bearings 9 are taken as an example, the first bearing 8 is sleeved on the intermediate shaft 5 and located on one side of the shaft shoulder 51, and the two second bearings 9 are sleeved on the intermediate shaft 5 side by side and located on the other side of the shaft shoulder 51.

[0039] Referring to Figure 1 and Figure 5The outer circumferential surface of one end of the inner cylinder 2 is uniformly distributed with a plurality of guide blocks 21, the guide blocks 21 are machined with positioning screw holes 22, the rod body 1 is machined with auxiliary positioning holes 14 matched with the positioning screw holes 22, the auxiliary positioning holes 14 can be screwed with positioning screws 23 in the positioning screw holes 22 to achieve auxiliary connection of the rod body 1 and the inner cylinder 2, and to enhance the stability of the connection of the rod body 1 and the inner cylinder 2. The outer circumferential surface of the other end of the inner cylinder 2 is uniformly distributed with a plurality of positioning blocks 24, the positioning blocks 24 are installed with positioning pins 25 and elastic members 26, the elastic members 26 are clamped between the positioning pins 25 and the inner bottom walls of the positioning blocks 24, the positioning pins 25 can extend to the outside of the positioning blocks 24 under the action of the elastic members 26, the elastic members 26 adopt springs but are not limited to springs, the outer diameters of the guide blocks 21 and the positioning blocks 24 match the inner diameter of the rod body 1, when the inner cylinder 2 is installed inside the rod body 1, the guide blocks 21 and the positioning blocks 24 can be supported on the inner wall of the rod body 1 to ensure that the inner cylinder 2 does not produce radial displacement inside the rod body 1, the rod body 1 is machined with positioning grooves 15 matched with the positioning pins 25, when the inner cylinder 2 is installed inside the rod body 1 and the positioning pins 25 are at positions corresponding to the positioning grooves 15, the positioning pins 25 are clamped in the positioning grooves 15 by extending out of the positioning blocks 24 under the action of the elastic members 26 to position the inner cylinder 2, the installation and positioning of the inner cylinder 2 inside the rod body 1 are completed by supporting the guide blocks 21 and the positioning blocks 24 on the inner wall of the rod body 1 and clamping the positioning pins 25 in the positioning grooves 15, the support is stable, and the positioning is reliable. A plurality of unlocking grooves 16 matched with the positioning pins 25 are machined on the inner wall of the rod body 1, the unlocking grooves 16 are uniformly distributed on the inner side wall of the rod body 1, one end of the unlocking groove 16 communicates with the positioning groove 15, the other end of the unlocking groove 16 smoothly transitions to the inner side wall of the rod body 1 in a spiral shape, the depth of the unlocking groove 16 is the largest at the position communicating with the positioning groove 15, the depth of the unlocking groove 16 gradually decreases in the spiral shape until it is flush with the inner wall of the rod body 1, when it is necessary to disassemble the rod body 1 and the inner cylinder 2, the inner cylinder 2 is rotated and pulled outward, when the positioning pin 25 is rotated to the position of the unlocking groove 16, the positioning pin 25 slides along the unlocking groove 16, as the depth of the unlocking groove 16 decreases, the positioning pin 25 is gradually compressed into the inside of the positioning block 24 until it slides to the end of the unlocking groove 16, the positioning pin 25 is completely retracted into the inside of the positioning block 24, the positioning of the inner cylinder 2 by the positioning pin 25 is released, and the inner cylinder 2 can be pulled out of the rod body 1 to complete the quick disassembly of the inner cylinder 2, and the operation is simple and fast.

[0040] The working principle of the present application is as follows: when assembling, the inner cylinder 2 and the valve core assembly are inserted from one end of the rod body 1. Since the outer diameter of the positioning block 24 matches the inner diameter of the rigid body, the positioning pin 25 is compressed inside the positioning block 24. When the inner cylinder 2 is inserted into the positioning groove 15 corresponding to the position of the positioning pin 25, the positioning pin 25 is extended from the positioning block 24 under the action of the elastic member 26 and clamped in the positioning groove 15. The inner cylinder 2 is installed in place and position-locked. To further improve the firmness of the connection between the inner cylinder 2 and the rod body 1, the inner cylinder 2 can be rotated so that the positioning screw hole 22 coincides with the position of the auxiliary positioning hole 14. The connection is strengthened by tightening the positioning screw 23 in the positioning screw hole 22. When disassembling the inner cylinder 2, the inner cylinder 2 is rotated and pulled outward. When the positioning pin 25 is rotated to a position corresponding to the unlocking groove 16, the positioning pin 25 slides along the unlocking groove 16. During the sliding process, as the depth of the unlocking groove 16 decreases, the positioning pin 25 is pressed back into the positioning block 24, releasing the locking of the inner cylinder 2 by the positioning pin 25. Then the inner cylinder 2 can be removed from the rod body 1.

[0041] The fluid enters the inner cylinder 2 through the connecting sleeve 3. The fluid pressure pushes the mandrel 6 tightly against the connecting sleeve 3, forming an axial self-seal. The fluid flows into the cavity 73 of the connecting rod 71 through the mandrel 6 and the center shaft, and is sprayed from the spray hole 74. During the spraying process, the fluid itself drives the nozzle seat 7, the center shaft and the mandrel 6 to rotate at high speed and continuously, generating multiple spiral flows, realizing composite pressurization of the fluid, maintaining the fluid pressure without loss, and improving the operation efficiency.

[0042] When multiple sets of the present application are connected with each other, the rod body 1 is threadedly connected with the inner thread 12 of the adjacent rod body 1 through the outer thread 11, and the inner cylinder 2 is plug-connected with the plug-in seat 4 of the adjacent inner cylinder 2 through the connecting sleeve 3.

[0043] The above is only the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made within the scope of the present application shall be within the technical scope of the present application.

Claims

1. A hollow high-strength straight rod, characterized by: The utility model provides a valve, including the pole body (1) and the inner tube (2), the pole body (1) and the inner tube (2) are all arranged inside hollow, the inner tube (2) is coaxial and can be detached from the inside of pole body (1) arrangement, the inner tube (2) one end detachably provided with the connecting sleeve (3), the inner tube (2) other end detachably provided with the plug-in seat (4), the inner tube (2) inside is provided with rotatable valve core subassembly, valve core subassembly includes intermediate shaft (5), mandrel (6) and shower nozzle seat (7), the shower nozzle seat (7) includes connecting rod (71) and seat head (72), the connecting rod (71) inside is provided with cavity (73), the intermediate shaft (5) one end detachably connected in the cavity (73), the seat head (72) end surface is provided with a plurality of spray holes (74), the spray hole (74) is inclinedly arranged from seat head (72) edge to seat head (72) center, and is communicated with cavity (73), the mandrel (6) is inserted in the intermediate shaft (5) through the connecting sleeve (3), and the bearing group is set on the intermediate shaft.

2. The hollow high-strength straight rod according to claim 1, characterized by: The outer circumferential surface of one end of the inner tube (2) is uniformly provided with a plurality of guide blocks (21), the guide blocks (21) are provided with positioning screw holes (22), the outer circumferential surface of the other end of the inner tube (2) is uniformly provided with a plurality of positioning blocks (24), the positioning blocks (24) are provided with positioning pins (25) and elastic members (26) inside, the elastic members (26) are clamped between the positioning pins (25) and the inner bottom walls of the positioning blocks (24), and the outer diameters of the guide blocks (21) and the positioning blocks (24) are matched with the inner diameter of the pole body (1).

3. The hollow high strength straight rod of claim 2, wherein: The inner circumferential surface of one end of the pole body (1) is provided with a positioning groove (15) matched with the positioning pins (25) and a plurality of unlocking grooves (16) matched with the positioning blocks (24), the plurality of unlocking grooves (16) are uniformly arranged on the pole body (1), one end of the unlocking grooves (16) is communicated with the positioning groove (15), and the other end is smoothly transitioned to the inner side wall of the pole body (1) in a spiral shape.

4. The hollow high strength straight rod of claim 1, wherein: The bearing set includes at least one first bearing (8) and at least one second bearing (9), the intermediate shaft (5) is provided with a shaft shoulder (51), and the first bearing (8) and the second bearing (9) are arranged on the two sides of the shaft shoulder (51) respectively.

5. The hollow high strength straight rod of claim 1, wherein: One end of the pole body (1) is provided with an internal thread (12), the other end of the pole body (1) is provided with an external thread (11), the internal thread (12) is matched with the external thread (11), and the internal thread (12) and the external thread (11) are taper threads or straight threads.

6. The hollow high strength straight rod of claim 1, wherein: The connecting sleeve (3) and the plug-in seat (4) are matched, the connecting sleeve (3) can be connected with the plug-in seat (4) in a plug-in mode, and a plurality of grooves (31) are arranged on the outer circumferential surface of one end of the connecting sleeve (3) away from the inner tube (2) in an axial direction.

7. The hollow high strength straight rod of claim 1, wherein: A plurality of sealing ring grooves (61) are arranged on the circumferential surface of the intermediate shaft (5) in an axial direction.

8. The hollow high strength straight rod of claim 3, wherein: The pole body (1) is provided with an auxiliary positioning hole (14), the auxiliary positioning hole (14) is matched with the positioning screw hole (22), and the auxiliary positioning hole (14) is provided with a positioning screw (23) inside.

9. The hollow high strength straight rod of claim 1, wherein: The reinforcing ribs (13) are arranged on the outer circumferential surface of the rod body (1) in a spiral shape, and the number of the reinforcing ribs (13) is 1-3.

10. The hollow high strength straight rod of claim 1, wherein: The number of the spray holes (74) is 2-6.

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