A high-stability coaxial telescopic transmission rod

Abstract

The invention discloses a high-stability coaxial telescopic transmission rod; the invention comprises an outer tube (1), and a motor connecting seat (2) is provided at the bottom of the outer tube (1); an inner tube (3) is provided inside the outer tube (1), and the inner tube (3) is matched with the outer tube (1); a transmission tube (101) is fixed inside the inner tube (3) via a bearing, and a transmission groove (102) is provided inside the transmission tube (101); a transmission shaft (103) is further provided inside the outer tube (1), one end of the transmission shaft (103) passes through the motor connecting seat (2) via a bearing, and a transmission key (104) is provided at the other end of the transmission shaft (103); the invention can arrange a driving motor at a handheld end, and always maintain normal power transmission during telescoping, and has good convenience in use; at the same time, the invention also has multiple anti-wall collision measures to ensure stable operation of the device, and has good reliability in use.

Description

Technical Field

[0001] The present invention relates to the field of transmission rods, and in particular to a high-stability coaxial telescopic transmission rod. Background Art

[0002] Telescopic rods are widely used in various applications requiring extended arms, such as harvesters and aerial chainsaws. However, existing telescopic rods only function as extensions, requiring the motor responsible for power output to be located directly at the end of the user's hand. The combined force of gravity from the motor and the rod creates a long torque, significantly increasing the strain on the user's hand and hindering ease of use. Therefore, designing a highly stable coaxial telescopic transmission rod that can shift the motor's fixed position to the handheld end without compromising power transmission has become a pressing challenge. Summary of the Invention

[0003] The present invention aims to provide a highly stable coaxial telescopic transmission rod. This invention allows the drive motor to be located at the handheld end, maintaining normal power transmission during telescoping, thus offering excellent ease of use. Furthermore, the invention incorporates multiple wall-impact protection features to ensure stable operation and high reliability.

[0004] The technical solution of the present invention is: a high-stability coaxial telescopic transmission rod, comprising an outer tube, a motor connecting seat being provided at the bottom of the outer tube; an inner tube being provided inside the outer tube, and the inner tube being matched with the outer tube; the characteristic is that a transmission tube is fixed inside the inner tube via a bearing, and a transmission groove is provided inside the transmission tube; a transmission shaft is also provided inside the outer tube, one end of the transmission shaft passes through the motor connecting seat via a bearing, and a transmission key is provided at the other end of the transmission shaft, and the transmission key extends into the transmission groove of the transmission tube and is matched with the transmission groove; an output head is provided at the end of the transmission tube; an anti-collision wall mechanism is provided between the end of the outer tube and the end of the corresponding side of the inner tube, and the anti-collision wall mechanism includes A fixed limit piece is arranged on the motor connecting seat, and a buffer spring is provided on the fixed limit piece to enclose the transmission shaft. The end of the buffer spring is provided with a movable limit piece corresponding to the end of the inner tube. The transmission shaft is passed through the fixed limit piece and the movable limit piece; the rotation of the transmission shaft drives the transmission key to rotate, the transmission key drives the transmission tube to rotate, and the rotation of the transmission tube drives the input head to rotate; when the inner tube is extended or contracted relative to the outer tube, the transmission key of the transmission shaft slides in the transmission groove, and at the same time continuously transmits the rotation to the transmission tube through the fitting structure of the transmission key and the transmission groove, the rotating tube rotates and drives the input head to rotate, thereby realizing continuous transmission of the rotational power of the input head when the outer tube and the inner tube are extended or contracted.

[0005] In the above-mentioned high-stability coaxial telescopic transmission rod, the outer side surface of the inner tube is provided with an axially arranged strip guide groove, and the inner side surface of the outer tube is provided with a convex strip that fits with the guide groove.

[0006] In the aforementioned high-stability coaxial telescopic transmission rod, the transmission groove is a square inner cavity arranged along the axial direction of the transmission tube, and the transmission key is a square key that fits with the transmission groove.

[0007] In the aforementioned high-stability coaxial telescopic transmission rod, a stabilizing sleeve is provided between the transmission tube and the inner tube, the outer side surface of the stabilizing sleeve fits with the inner wall of the inner tube, the middle part of the stabilizing sleeve has a stabilizing hole, and the transmission tube passes through the stabilizing hole; the end of the stabilizing sleeve is provided with a symmetrically arranged elastic limiting plate, the elastic limiting plate is provided with a locking block, and the inner tube is provided with a locking hole that fits with the locking block.

[0008] In the aforementioned high-stability coaxial telescopic transmission rod, bearing seats are provided at both ends of the inner tube, and the transmission tube is located in the bearing seats; the side of the bearing seat is provided with a symmetrical strip fixing plate, the inner wall of the fixing plate is provided with a fixing block, and the side of the inner tube is provided with a fixing hole that is compatible with the fixing block.

[0009] In the aforementioned high-stability coaxial telescopic transmission rod, a fixing ring is provided at the end of the fixing plate, a threaded hole is provided on the surface of the fixing ring, and the fixing ring is fixed to the inner tube via bolts.

[0010] In the aforementioned high-stability coaxial telescopic transmission rod, the motor connecting seat includes a fixed seat body fixed to the bottom of the outer tube, a mounting cavity is provided inside the fixed seat body, and an elastic mounting plate is provided on the surface of the fixed seat body; two coaxially arranged bearings are provided in the mounting cavity; a first mounting protrusion is provided on the elastic mounting plate, and a first mounting hole is provided at the end of the outer tube to match the first mounting protrusion.

[0011] In the aforementioned high-stability coaxial telescopic transmission rod, the outside of the fixed seat body is also sleeved with a connecting seat body, one end of the connecting seat body is provided with an elastic clip, and the other end of the connecting seat body is provided with a connecting thread; a second mounting protrusion is provided on the inner wall of the elastic clip, and the outer surface of the outer tube is provided with a second mounting hole that fits with the second mounting protrusion; the bottom end surface of the fixed seat body is provided with a baffle, and the end surface of the outer tube is in contact with the inner end surface of the baffle; a fixed step is provided inside the connecting seat body, and the fixed step conflicts with the outer end surface of the baffle.

[0012] In the aforementioned high-stability coaxial telescopic transmission rod, the outer tube is provided with a locking mechanism adapted to the inner tube, and the locking mechanism includes an inner sleeve body arranged at the end of the outer tube, an outer sleeve body is provided on the outer side surface of the inner sleeve body, and the outer sleeve body has a fixed cavity, and the outer tube and the inner sleeve body are both provided with locking openings connected to the fixed cavity, a slidingly connected locking block is provided in the fixed cavity, and the inner tube is provided with a plurality of locking grooves that fit with the locking block, a pressing plate is provided on one side of the locking block, and the middle part of the pressing plate is elastically rotatably connected to the fixed cavity, an action port is provided on the locking block, and the end of the pressing plate is located in the action port.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. A transmission tube is fixed inside the inner tube of the present invention via a bearing, and a transmission groove is provided inside the transmission tube; a transmission shaft is also provided inside the outer tube, one end of the transmission shaft passes through the motor connecting seat via a bearing, and the other end of the transmission shaft is provided with a transmission key, the transmission key extends into the transmission groove of the transmission tube and fits with the transmission groove; an output head is provided at the end of the transmission tube; the driving motor is fixed to the motor connecting seat and connected to the end of the transmission shaft, the output head is connected to the driving component, and the driving motor is started, the driving motor drives the transmission shaft to rotate, the rotation of the transmission shaft drives the transmission key to rotate, the transmission key drives the transmission tube to rotate, and the transmission tube rotates and drives the input head to rotate; when the inner tube is extended and retracted relative to the outer tube, the transmission key of the transmission shaft slides in the transmission groove, and at the same time continuously transmits the rotation to the transmission tube through the fitting structure of the transmission key and the transmission groove, the rotating tube rotates and drives the input head to rotate, so that the rotational power of the input head is continuously transmitted when the outer tube and the inner tube are extended and retracted, the transmission is reliable, and the installation position of the driving motor is effectively optimized, and the use is convenient.

[0015] 2. The outer side surface of the inner tube of the present invention is provided with an axially arranged strip guide groove, and the inner side surface of the outer tube is provided with a convex strip that fits with the guide groove. When the inner tube moves, the limit between the guide groove and the convex strip can prevent the inner tube from rotating, ensuring stability during movement, and thus preventing the working parts arranged at the end of the inner tube from shaking, ensuring its normal operation and further improving its reliability in use.

[0016] 3. A stabilizing sleeve is provided between the transmission tube and the inner tube of the present invention, the outer side surface of the stabilizing sleeve fits with the inner wall of the inner tube, the middle part of the stabilizing sleeve is provided with a stabilizing hole, and the transmission tube passes through the stabilizing hole; the end of the stabilizing sleeve is provided with symmetrically arranged elastic limiting plates, the elastic limiting plates are provided with locking blocks, and the inner tube is provided with a locking hole that fits with the locking blocks; the transmission tube passes through the stabilizing hole, presses the elastic limiting plate, and places the stabilizing sleeve into the inner tube. When the locking block reaches the locking hole position, the elastic limiting plate is reset, and the locking block enters the locking hole to fix the stabilizing sleeve, and the installation is convenient; when the transmission tube is operating inside, the stabilizing sleeve remains fixed inside, and the vibration generated by the shoveling tube directly acts on the stabilizing hole, effectively reducing its shaking range, thereby preventing it from hitting the wall, improving stability, and reliable use.

[0017] 4. In the present invention, bearing seats are provided at both ends of the inner tube, and the transmission tube is located in the bearing seats; a symmetrical strip-shaped fixing plate is provided on the side of the bearing seat, a fixing block is provided on the inner wall of the fixing plate, and a fixing hole that is compatible with the fixing block is provided on the side of the inner tube; during installation, the bearing seat body is inserted from the end of the inner tube on the corresponding side, and when the fixing block on the fixing plate reaches the position of the fixing hole, the fixing block is naturally inserted into the fixing hole to achieve positioning, and is connected and fixed with the side wall of the inner tube. There is no need to set requirements for the wall thickness of the inner tube, which effectively reduces the overall volume of the device, improves the convenience of use, and reduces the dependence on bolts, with the characteristics of easy installation.

[0018] 5. The motor connecting seat of the present invention includes a fixing seat body fixed to the bottom of the outer tube, a mounting cavity is provided inside the fixing seat body, and an elastic mounting plate is provided on the surface of the fixing seat body; two coaxially arranged bearings are provided in the mounting cavity; a first mounting protrusion is provided on the elastic mounting plate, and a first mounting hole (606) that fits with the first mounting protrusion is provided at the end of the outer tube; during installation, the fixing seat body is inserted into the outer tube, and the mounting protrusion is snapped into the mounting hole, and the elasticity of the elastic mounting plate is used to achieve fixation, and disassembly and assembly are convenient. The transmission shaft is set in the two bearings, so that its end is firmly limited, effectively preventing shaking during operation, and having good reliability in use.

[0019] 6. The anti-collision wall mechanism of the present invention includes a fixed limiter arranged on the motor connecting seat, and the fixed limiter is provided with a buffer spring that encloses the transmission shaft, and the end of the buffer spring is provided with a movable limiter corresponding to the end of the inner tube, and the transmission shaft is passed through the fixed limiter and the movable limiter; the end of the transmission shaft on the outer part of the inner tube is limited by the contact between the fixed limiter and the movable limiter and the outer tube, thereby reducing its shaking and preventing it from hitting the wall; when the inner tube moves outward or inward, the buffer spring produces corresponding deformation, so that the movable limiter remains in contact with the end of the inner tube, thereby always matching the length of the transmission shaft on the outer part of the inner tube, and has good practicality and reliability.

[0020] 7. The locking mechanism of the present invention includes an inner sleeve body arranged at the end of the outer tube, an outer sleeve body is provided on the outer side surface of the inner sleeve body, and a fixed cavity is provided on the outer sleeve body, and a locking port connected to the fixed cavity is provided on both the outer tube and the inner sleeve body, and a slidingly connected locking block is provided in the fixed cavity, and a plurality of locking grooves that fit with the locking block are provided on the inner tube, and a pressing plate is provided on one side of the locking block, and the middle part of the pressing plate is elastically rotatably connected to the fixed cavity, and an effective port is provided on the locking block, and the end part of the pressing plate is located in the effective port; by pressing one end of the pressing plate, the pressing plate rotates around the connection between the middle part and the fixed cavity, and then drives the locking block to disengage from the locking groove through the effective port, thereby realizing unlocking between the inner tube and the outer tube; when the inner tube moves to the appropriate position, the pressing plate is released, and the pressing plate drives the locking block to naturally return to its original position through its elasticity, and re-matches with the locking groove, thereby fixing the inner tube from the outer tube without the need for manual fixing by the user, and the use is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the transmission tube and the transmission shaft of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the transmission groove of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the transmission key of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the inner tube and outer tube of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the stabilizing sleeve of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the locking hole of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the bearing seat main body of the present invention;

[0029] Figure 9 It is a structural schematic diagram of the fixing hole of the present invention;

[0030] Figure 10 It is a structural schematic diagram of the first transmission bearing seat of the present invention;

[0031] Figure 11 It is a structural schematic diagram of the fixing seat body of the present invention;

[0032] Figure 12 It is a schematic diagram of the structure inside the fixing seat body of the present invention;

[0033] Figure 13 It is a structural schematic diagram of the mounting hole of the present invention;

[0034] Figure 14 It is a structural schematic diagram of the connecting seat body of the present invention;

[0035] Figure 15 It is a structural schematic diagram of the fixed step of the present invention;

[0036] Figure 16 is a schematic structural diagram of the second mounting protrusion of the present invention;

[0037] Figure 17 It is a structural schematic diagram of the anti-collision wall mechanism of the present invention;

[0038] Figure 18 It is a structural schematic diagram of the locking mechanism of the present invention;

[0039] Figure 19 It is a structural schematic diagram of the fixed cavity of the present invention;

[0040] Figure 20 It is a structural schematic diagram of the inner sleeve of the present invention.

[0041] The markings in the accompanying drawings are: 1-outer tube; 2-motor connecting seat; 3-inner tube; 101-transmission tube; 102-transmission groove; 103-transmission shaft; 104-transmission key; 105-output head; 200-anti-collision wall mechanism; 201-fixed limiter; 202-buffer spring; 203-movable limiter; 301-guide groove; 302-rib; 304-locking groove; 305-locking mechanism; 307-inner sleeve; 308-outer sleeve; 309-fixing cavity; 310-locking block; 311-press plate; 312-action port; 316-locking port; 401-stabilizing sleeve; 402-stabilizing Hole; 403-elastic limit plate; 404-locking block; 405-locking hole; 503-bearing seat body; 504-fixing plate; 505-fixing block; 506-fixing hole; 507-fixing ring; 508-fixing groove; 510-threaded hole; 601-fixing seat body; 602-mounting cavity; 603-elastic mounting plate; 604-stable bearing; 605-first mounting protrusion; 606-first mounting hole; 607-baffle; 608-connecting seat body; 609-elastic clip; 610-connecting thread; 614-second mounting protrusion; 615-second mounting hole; 616-fixing step. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0043] Embodiment: A high stability coaxial telescopic transmission rod, as shown in the attached Figure 1 and attached Figure 2 As shown, it includes an outer tube 1, and a motor connecting seat 2 is provided at the bottom of the outer tube 1; an inner tube 3 is provided inside the outer tube 1, and the inner tube 3 is matched with the outer tube 1; a transmission tube 101 is fixed inside the inner tube 3 via a bearing, and a transmission groove 102 is provided inside the transmission tube 101; a transmission shaft 103 is also provided inside the outer tube 1, one end of the transmission shaft 103 passes through the motor connecting seat 2 via a bearing, and a transmission key 104 is provided at the other end of the transmission shaft 103, and the transmission key 104 extends into the transmission groove 102 of the transmission tube 101 and matches with the transmission groove 102; an output head 105 is provided at the end of the transmission tube 101; a locking mechanism 305 adapted to the inner tube 3 is provided on the outer tube 1, and an anti-collision wall mechanism 200 is provided between the end of the outer tube 1 and the end of the corresponding side of the inner tube 3, as shown in the attached figure. Figure 17As shown, the anti-collision wall mechanism 200 includes a fixed limit piece 201 arranged on the motor connecting seat 2, and a buffer spring 202 is provided on the fixed limit piece 201 to enclose the transmission shaft 103, and the end of the buffer spring 202 is provided with a movable limit piece 203 corresponding to the end of the inner tube 3, and the transmission shaft 103 is passed through the fixed limit piece 201 and the movable limit piece 203; the rotation of the transmission shaft 103 drives the transmission key 104 to rotate, the transmission key 104 drives the transmission tube 101 to rotate, and the transmission tube 101 rotates and drives the input head 105 to rotate; when the inner tube 3 is extended or retracted relative to the outer tube 1, the transmission key 104 of the transmission shaft 103 slides in the transmission groove 102, and at the same time continuously transmits the rotation to the transmission tube 101 through the fitting structure of the transmission key 104 and the transmission groove 102, the rotating tube 101 rotates and drives the input head 105 to rotate, thereby realizing the continuous transmission of the rotational power of the input head 105 when the outer tube 1 and the inner tube 3 are extended or retracted. The Chinese invention patent with publication number 202010816022.0 discloses a coaxial retractable aerial electric saw. This invention application is the basic model developed by the research and development team of the applicant of the present invention. In this invention patent application, the inner tube and the transmission tube are fixedly arranged, and the rotational power is output by the rotation of the inner tube. However, the rotation of the inner tube can easily cause accidental injury to the operator, and when the outer tube and the inner tube are retracted and locked, the operation needs to be stopped, the work efficiency is greatly reduced, and the work effect is not ideal. Moreover, in the present invention, it is creatively proposed to set the input head 105 at the end of the transmission tube, connect the transmission tube and the inner tube through a bearing, and transmit the rotational power through the rotation of the transmission tube, and the transmission process can be arbitrarily extended and retracted during rotation, which greatly improves the practicality, convenience and safety of use. As shown in the attached Figure 5 As shown, the outer side of the inner tube 3 is provided with an axially arranged strip guide groove 301, and the inner side of the outer tube 1 is provided with a convex strip 302 that fits with the guide groove 301; Figure 3 and attached Figure 4 As shown, the transmission groove 102 is a square inner cavity arranged along the axial direction of the transmission tube 101, and the transmission key 104 is a square key that fits with the transmission groove 102; Figure 6 and attached Figure 7 As shown, a stabilizing sleeve 401 is provided between the transmission tube 101 and the inner tube 3, the outer side of the stabilizing sleeve 401 is matched with the inner wall of the inner tube 2, the middle of the stabilizing sleeve 401 has a stabilizing hole 402, and the transmission tube 101 passes through the stabilizing hole 402; the end of the stabilizing sleeve 401 is provided with a symmetrically arranged elastic limiting piece 403, the elastic limiting piece 403 is provided with a locking block 404, and the inner tube 3 is provided with a locking hole 405 that matches the locking block 404; as shown in the attached Figure 8 To the attached Figure 10As shown, bearing seats 503 are provided at both ends of the inner tube 3, and the transmission tube 101 is located in the bearing seats; a symmetrical strip-shaped fixing plate 504 is provided on the side of the bearing seat 503, a fixing block 505 is provided on the inner wall of the fixing plate 504, and a fixing hole 506 adapted to the fixing block 505 is provided on the side of the inner tube 3; a fixing groove 508 is provided on the inner tube 3 to fit the fixing plate 504; a fixing ring 507 is provided at the end of the fixing plate 504, and a threaded hole 510 is provided on the surface of the fixing ring 507, and the fixing ring 507 is fixed to the inner tube 3 by bolts; as shown in the attached Figure 11 To the attached Figure 16 As shown, the motor connection base 2 includes a fixed base body 601 fixed to the bottom of the outer tube 1, the interior of the fixed base body 601 is provided with a mounting cavity 602, and the surface of the fixed base body 601 is provided with an elastic mounting piece 603; two coaxially arranged stable bearings 604 are provided in the mounting cavity 602; a first mounting protrusion 605 is provided on the elastic mounting piece 603, and a first mounting hole 606 that fits with the first mounting protrusion 605 is provided at the end of the outer tube 1; the outer surface of the fixed base body 601 is also provided with a connecting base body 608, and the connecting base body 60 8 is provided with an elastic clip 609 at one end, and a connecting thread 610 is provided at the other end of the connecting seat body 608; a second mounting protrusion 614 is provided on the inner wall of the elastic clip 609, and a second mounting hole 615 is provided on the outer surface of the outer tube 1 to fit with the second mounting protrusion 614; a baffle 607 is provided on the bottom end surface of the fixed seat body 601, and the end surface of the outer tube 1 fits with the inner end surface of the baffle 607; a fixing step 616 is provided inside the connecting seat body 608, and the fixing step 616 conflicts with the outer end surface of the baffle 607; as shown in the attached Figure 18 To the attached Figure 20 As shown, the outer tube 1 is provided with a locking mechanism 305 adapted to the inner tube 3, and the locking mechanism 305 includes an inner sleeve 307 arranged at the end of the outer tube 1, and an outer sleeve 308 is provided on the outer surface of the inner sleeve 307, and the outer sleeve 308 has a fixed cavity 309. The outer tube 1 and the inner sleeve 307 are both provided with a locking port 316 connected to the fixed cavity 309, and a slidingly connected locking block 310 is provided in the fixed cavity 309. The inner tube 3 is provided with a plurality of locking grooves 304 that fit with the locking block 310, and a pressing plate 311 is provided on one side of the locking block 310. The middle part of the pressing plate 311 is elastically rotatably connected to the fixed cavity 309, and an action port 312 is provided on the locking block 310, and the end of the pressing plate 311 is located in the action port 312.

[0044] Working principle: The drive motor is fixed to the motor connecting seat and connected to the end of the transmission shaft. The output head is connected to the driving component. When the drive motor is started, the drive motor drives the transmission shaft to rotate. The rotation of the transmission shaft drives the transmission key to rotate. The transmission key drives the transmission tube to rotate. The transmission tube rotates and drives the input head to rotate. When the inner tube is extended or retracted relative to the outer tube, the transmission key of the transmission shaft slides in the transmission groove. At the same time, the rotation is continuously transmitted to the transmission tube through the fitting structure of the transmission key and the transmission groove. The rotating tube rotates and drives the input head to rotate, thereby realizing the continuous transmission of the rotational power of the input head when the outer tube and the inner tube are extended or retracted. The transmission is reliable and the installation position of the drive motor is effectively optimized.

Claims

1. A high-stability coaxial telescopic transmission rod, comprising an outer tube (1), wherein a motor connection seat (2) is provided at the bottom of the outer tube (1); an inner tube (3) is provided inside the outer tube (1), and the inner tube (3) fits with the outer tube (1); and is characterized in that: A transmission tube (101) is fixed inside the inner tube (3) via a bearing, and a transmission groove (102) is provided inside the transmission tube (101); a transmission shaft (103) is also provided inside the outer tube (1), one end of the transmission shaft (103) passes through the motor connection seat (2) via a bearing, and a transmission key (104) is provided at the other end of the transmission shaft (103), and the transmission key (104) extends into the transmission groove (102) of the transmission tube (101) and fits with the transmission groove (102); an input head (105) is provided at the end of the transmission tube (101); an anti-collision wall mechanism (200) is provided between the end of the outer tube (1) and the end of the corresponding side of the inner tube (3), and the anti-collision wall mechanism (200) includes a A fixed stopper (201) is placed on the motor connection seat (2), and a buffer spring (202) is provided on the fixed stopper (201) to enclose the transmission shaft (103). The end of the buffer spring (202) is provided with a movable stopper (203) corresponding to the end of the inner tube (3). The transmission shaft (103) is passed through the fixed stopper (201) and the movable stopper (203); the transmission shaft (103) rotates to drive the transmission key (104), the transmission key (104) drives the transmission tube (101) to rotate, and the transmission tube (101) rotates and drives the input head (105) to rotate; when the inner tube (3) is extended or retracted relative to the outer tube (1), the transmission key (104) of the transmission shaft (103) rotates in the transmission tube (101). The transmission tube (101) slides in the movable groove (102), and at the same time continuously transmits the rotation to the transmission tube (101) through the matching structure of the transmission key (104) and the transmission groove (102). The transmission tube (101) rotates and drives the input head (105) to rotate, thereby realizing continuous transmission of the rotational power of the input head (105) when the outer tube (1) and the inner tube (3) are extended and contracted; a stabilizing sleeve (401) is provided between the transmission tube (101) and the inner tube (3), the outer side surface of the stabilizing sleeve (401) is matched with the inner wall of the inner tube (3), the middle part of the stabilizing sleeve (401) has a stabilizing hole (402), and the transmission tube (101) passes through the stabilizing hole (402); the ends of the stabilizing sleeve (401) are provided with symmetrically arranged elastic limiting springs. The positioning piece (403) is provided with a locking block (404) on the elastic limiting piece (403), and the inner tube (3) is provided with a locking hole (405) that matches the locking block (404); the motor connecting seat (2) includes a fixed seat body (601) fixed to the bottom of the outer tube (1), the interior of the fixed seat body (601) is provided with a mounting cavity (602), and the surface of the fixed seat body (601) is provided with an elastic mounting piece (603); two coaxially arranged stabilizing bearings (604) are provided in the mounting cavity (602); a first mounting protrusion (605) is provided on the elastic mounting piece (603), and a first mounting hole (606) that matches the first mounting protrusion (605) is provided at the end of the outer tube (1);The outer tube (1) is provided with a locking mechanism (305) adapted to the inner tube (3), the locking mechanism (305) comprising an inner sleeve (307) arranged at the end of the outer tube (1), an outer sleeve (308) provided on the outer side of the inner sleeve (307), the outer sleeve (308) having a fixed cavity (309), a locking opening (316) communicating with the fixed cavity (309) provided on both the outer tube (1) and the inner sleeve (307), a locking block (310) slidably connected in the fixed cavity (309), a plurality of locking grooves (304) matched with the locking block (310) provided on the inner tube (3), a pressing plate (311) provided on one side of the locking block (310), the middle portion of the pressing plate (311) being elastically rotatably connected to the fixed cavity (309), an action opening (312) provided on the locking block (310), the end of the pressing plate (311) being located in the action opening (312). ; 2. The high-stability coaxial telescopic transmission rod according to claim 1, characterized in that: The outer side surface of the inner tube (3) is provided with an axially arranged strip-shaped guide groove (301), and the inner side surface of the outer tube (1) is provided with a convex strip (302) that fits with the guide groove (301).

3. The high-stability coaxial telescopic transmission rod according to claim 1, characterized in that: The transmission groove (102) is a square inner cavity arranged along the axial direction of the transmission tube (101), and the transmission key (104) is a square key that fits with the transmission groove (102).

4. The high-stability coaxial telescopic transmission rod according to claim 1, characterized in that: The inner tube (3) is provided with bearing seats (503) at both ends, and the transmission tube (101) is located in the bearing seats; the side of the bearing seat (503) is provided with a symmetrical strip-shaped fixing plate (504), the inner wall of the fixing plate (504) is provided with a fixing block (505), and the side of the inner tube (3) is provided with a fixing hole (506) adapted to the fixing block (505); the inner tube (3) is provided with a fixing groove (508) that fits with the fixing plate (504).

5. The high-stability coaxial telescopic transmission rod according to claim 4, characterized in that: A fixing ring (507) is provided at the end of the fixing plate (504), a threaded hole (510) is provided on the surface of the fixing ring (507), and the fixing ring (507) is fixed to the inner tube (3) via bolts.

6. The high-stability coaxial telescopic transmission rod according to claim 1, characterized in that: The fixed seat body (601) is also provided with a connecting seat body (608) on the outside, an elastic clip (609) is provided at one end of the connecting seat body (608), and a connecting thread (610) is provided at the other end of the connecting seat body (608); a second mounting protrusion (614) is provided on the inner wall of the elastic clip (609), and a second mounting hole (615) is provided on the outer surface of the outer tube (1) and is matched with the second mounting protrusion (614); a baffle (607) is provided on the bottom end surface of the fixed seat body (601), and the end surface of the outer tube (1) is matched with the inner end surface of the baffle (607); a fixed step (616) is provided inside the connecting seat body (608), and the fixed step (616) is in conflict with the outer end surface of the baffle (607).

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