Radial drill capable of drilling multiple holes simultaneously

Abstract

The utility model relates to the technical field of radial drills, and discloses a radial drill capable of drilling multiple holes simultaneously, which comprises a radial drill workbench, a fixing device shell is fixedly arranged on the right side of the upper surface of the radial drill workbench, a first groove is arranged on the left side of the fixing device shell close to the middle position, and a fixing device is arranged on the first groove. A polished shaft is fixedly installed in the middle of the left side of the radial drill workbench, a supporting plate is fixedly installed on the right side of the end, away from the radial drill workbench, of the polished shaft, a part needing to be drilled is fixed through the fixing device, so that equipment is more stable during drilling, manual fixing of workers is not needed, and therefore the workload of the workers is reduced; and the equipment is locked through the characteristics of the worm wheel and the worm, deviation caused by movement of the first movable sleeve due to the acting force generated in the drilling process is effectively prevented, meanwhile, the drilling device does not need to be fixed after a worker manually adjusts the drilling position, and therefore the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of radial drills, in particular to a radial drill capable of drilling multiple holes at the same time. Background Art

[0002] The radial drill is a branch of the drilling machine, and is named after the fact that the cross arm can rotate around the column. Taking the Z3050×16 model as an example, the capital letter Z is the abbreviation of drilling machine, 30 is the radial arm, the back 50 is the drilling diameter, and ×16 is the arm length. The radial drilling machine is a general-purpose ordinary processing machine with a wide range of uses. Customization is possible in the processing and production of radial drills.

[0003] Existing radial drills are drilled by multiple drilling devices during use. Some radial drills lack fixing devices and need to be fixed manually by employees, which increases the workload of workers. At the same time, when adjusting the drilling position, workers need to manually move multiple drilling devices and fix them, which reduces work efficiency. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the utility model provides a radial drill for drilling multiple holes at the same time, which solves the problem that the radial drill lacks a fixing device and needs to be fixed manually by employees, thereby increasing the workload of the workers. At the same time, it also solves the problem that when adjusting the drilling position, the workers need to manually move multiple drilling devices and then fix them, thereby reducing the work efficiency.

[0006] (II) Technical solution

[0007] To achieve the above object, the utility model provides the following technical solutions: a radial drill for drilling multiple holes at the same time, comprising a radial drill workbench, a fixing device housing is fixedly installed on the right side of the upper surface of the radial drill workbench, a first groove is opened near the middle position on the left side of the fixing device housing, and a fixing device is arranged on the first groove;

[0008] Among them, an optical axis is fixedly installed at the middle position of the left side of the radial drilling workbench, and a support plate is fixedly installed on the right side of the end of the optical axis away from the radial drilling workbench, and a lifting device is arranged on the support plate;

[0009] The outer surface sliding sleeve of the optical axis is provided with a rocker arm, a second groove is provided at the middle position of the upper surface of the end of the rocker arm away from the optical axis, a translation device is provided on the second groove, and a motor groove is provided at the end of the second groove close to the optical axis;

[0010] The middle positions of the front and rear ends of the rocker arm are provided with convex grooves, and a limit plate is fixedly installed on the end of the rocker arm away from the optical axis;

[0011] The outer surface sliding sleeve of the rocker arm is provided with a first movable sleeve, an auxiliary translation device is arranged on the first movable sleeve, and a drilling device is fixedly installed on the bottom of the first movable sleeve.

[0012] Preferably, the fixing device comprises a second reversing motor, which is fixedly mounted at the bottom of the fixing device housing near the right side, and is fixedly mounted inside the radial drill workbench;

[0013] The output end of the second reversing motor passes through the outer surface of the fixing device housing and extends to the inside of the first groove. The output end of the second reversing motor is located in the outer surface of the first groove. The fixing sleeve is provided with a gear. The left outer surface of the gear is provided with an incomplete gear. The gear is meshed and connected with the incomplete gear.

[0014] Wherein, a half gear is arranged near the front end outer surface of the incomplete gear, and the incomplete gear is meshed and connected with the half gear;

[0015] Wherein, the center positions of the incomplete gear and the half gear are fixedly sleeved with a first rotating shaft, and both ends of the two first rotating shafts are rotatably mounted on the top and bottom of the inner wall of the first groove.

[0016] Preferably, two first connecting plates are fixedly installed on the ends of the outer surfaces of the incomplete gear and the half gear away from each other, and the first connecting shafts are fixedly installed on the ends of the two first connecting plates away from the incomplete gear and the half gear, and the two first connecting shafts are rotatably installed with a fixing plate on the outer surface between the two first connecting plates, and the opposite surfaces of the ends of the two fixing plates away from the two first connecting shafts are fixedly installed with fixing blocks, and the opposite surfaces of the two fixing blocks are fixedly installed with anti-skid chains;

[0017] Among them, the second connecting shafts are rotatably installed in the middle position of the two fixed plates, the two ends of the two second connecting shafts are located at the bottom and top outer surfaces of the first movable sleeve and two second connecting plates are rotatably installed, the ends of the two second connecting plates away from the two second connecting shafts are fixedly installed with cylinders, the inner walls of the two cylinders are rotatably sleeved with second rotating shafts, and the two ends of the two second rotating shafts are fixedly installed on the top and bottom of the inner wall of the first groove.

[0018] Preferably, the lifting device comprises a first threaded rod, which is rotatably mounted on the bottom of the support plate and located in the middle position on the right side of the optical axis, and one end of the first threaded rod away from the support plate is rotatably mounted on the upper surface of the radial drill workbench;

[0019] Among them, a first reversing motor is fixedly installed on the top right side of the supporting plate, and the output end of the first reversing motor passes through the supporting plate and is rotatably connected to one end of the first threaded rod.

[0020] Preferably, the translation device comprises a second threaded rod, which is rotatably mounted inside the second groove, a second movable sleeve is threadedly connected to the outer surface of the second groove, and an end of the second movable sleeve away from the second threaded rod is fixedly connected to the middle position of the top of the inner wall of the first movable sleeve;

[0021] Wherein, one end of the second groove close to the optical axis passes through the second groove and enters the interior of the motor groove, and a turbine is fixedly sleeved on the outer surface of the second groove located inside the motor groove;

[0022] Among them, a third reversing motor is fixedly installed inside the motor slot, a worm is fixedly installed at the output end of the third reversing motor, and the worm is meshingly connected with the turbine.

[0023] Preferably, the auxiliary translation device comprises two sliding plates, both of which are fixedly mounted on the inner wall of the first movable sleeve at the positions corresponding to the two convex grooves at the front and rear ends, and the two sliding plates are arranged in close contact with the protruding ends of the two convex grooves;

[0024] Wherein, two wheels are rotatably mounted on both sides of one end of the two sliding plates away from the first movable sleeve, and the two wheels are slidably connected to the bottom of the inner walls of the two convex grooves.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the utility model provides a radial drill for drilling multiple holes at the same time, which has the following beneficial effects:

[0027] 1. When the radial drill for drilling multiple holes at the same time is fixed, the second reverse motor is started, the rotation of the second reverse motor drives the gear to rotate, the rotation of the gear drives the incomplete gear to rotate, the rotation of the fixing device housing drives the first rotating shaft to rotate, the rotation of the fixing device housing drives the half gear to rotate, the rotation of the half gear drives the same first rotating shaft to rotate, the rotation of the incomplete gear and the half gear drives the two first connecting plates on both sides to rotate with the incomplete gear and the half gear as the axis, the two first connecting plates on both sides rotate with the incomplete gear and the half gear as the axis to drive the two fixing plates to move forward, so that the two fixing plates rotate on the outer surfaces of the two first connecting shafts, and the two fixing plates move forward with The two second connecting plates on both sides are moved forward, and the two second connecting plates move forward to rotate the two second connecting shafts. The two second connecting plates move forward to drive the two cylinders to rotate on the outer surfaces of the two second rotating shafts, so that the two second connecting plates rotate with the second rotating shafts as the axis, and limit the two fixed plates to move closer to the middle, the two first movable sleeves move closer to the middle to drive the fixed blocks move closer to the middle, and the two fixed blocks move closer to the middle to drive the anti-skid chains move closer to the middle, thereby completing the fixation. The parts that need to be drilled are fixed by the fixing device to make the equipment more stable when drilling. At the same time, workers do not need to fix them manually, thereby reducing the workload of workers.

[0028] 2. The radial drill for drilling multiple holes at the same time is started when drilling holes, and the third reverse motor, the output end of the third reverse motor rotates to drive the worm to rotate, the worm rotates to drive the turbine to rotate, the turbine rotates to rotate the second threaded rod, the second threaded rod rotates to drive the limit plate to move, the limit plate moves to drive the first movable sleeve to move, the first movable sleeve moves to drive the sliding plate to move, the sliding plate moves to drive the wheel to move, so that the wheel and the sliding plate slide on the inner wall of the convex groove, reducing the weight given by the equipment, the first movable sleeve moves to drive the drilling device to move, and the drilling device is moved to the desired position. After reaching the drilling position, stop moving and start the first reversing motor. The output end of the first reversing motor rotates to drive the first threaded rod to rotate. The rotation of the first threaded rod drives the rocker arm to move downward. The downward movement of the rocker arm drives the device thereon to follow the movement. After the first movable sleeve is brought close to the part to be drilled, start the drilling device to drill holes. The equipment is locked by the characteristics of the turbine and the worm, which effectively prevents the force generated during the drilling process from causing the first movable sleeve to move and cause deviations. At the same time, employees do not need to manually adjust the drilling position before fixing the drilling device, thereby increasing work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the side view structure of a radial drill for drilling multiple holes at the same time according to the utility model;

[0030] Figure 2 It is a schematic diagram of the rocker arm cutaway separation structure;

[0031] Figure 3 It is a schematic diagram of the rocker arm structure;

[0032] Figure 4 It is a schematic diagram of the cross-sectional structure of the fixing device;

[0033] Figure 5 A schematic diagram of the fixing device structure.

[0034] In the figure: 1, radial drill workbench; 2, fixing device housing; 3, optical axis; 4, support plate; 5, rocker arm; 6, motor slot; 7, first movable sleeve; 8, first reversing motor; 9, first groove; 10, second reversing motor; 11, gear; 12, incomplete gear; 13, half gear; 14, first rotating shaft; 15, first connecting plate; 16, first connecting shaft; 17, fixing plate; 18, fixing block; 19, anti-skid chain; 20, second connecting shaft; 21, second connecting plate; 22, cylinder; 23, second rotating shaft; 24, first threaded rod; 25, third reversing motor; 26, worm; 27, turbine; 28, second groove; 29, second threaded rod; 30, limit plate; 31, convex groove; 32, wheel; 33, sliding plate; 34, second movable sleeve. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figure 1-5 The utility model provides a technical solution: a radial drill for drilling multiple holes at the same time, comprising a radial drill workbench 1, a fixing device shell 2 is fixedly installed on the right side of the upper surface of the radial drill workbench 1, a first groove 9 is opened near the middle position on the left side of the fixing device shell 2, a fixing device is arranged on the first groove 9, an optical axis 3 is fixedly installed at the middle position on the left side of the radial drill workbench 1, a support plate 4 is fixedly installed on the right side of one end of the optical axis 3 away from the radial drill workbench 1, a lifting device is arranged on the support plate 4, a rocker 5 is provided with a sliding sleeve on the outer surface of the optical axis 3, a second groove 28 is opened at the middle position of the upper surface of the end of the rocker 5 away from the optical axis 3, a translation device is arranged on the second groove 28, and a motor slot 6 is opened at one end of the second groove 28 close to the optical axis 3, convex grooves 31 are opened at the middle positions of the front and rear ends of the rocker 5, and a limiting plate 30 is fixedly installed on the end of the rocker 5 away from the optical axis 3, a first movable sleeve 7 is provided on the outer surface of the rocker 5, an auxiliary translation device is arranged on the first movable sleeve 7, and a drilling device is fixedly installed at the bottom of the first movable sleeve 7.

[0037] Furthermore, the fixing device includes a second reversing motor 10, which is fixedly installed at the bottom of the fixing device housing 2 near the right side, and the second reversing motor 10 is fixedly installed inside the radial drill workbench 1, and the output end of the second reversing motor 10 passes through the outer surface of the fixing device housing 2 and extends to the inside of the first groove 9. The output end of the second reversing motor 10 is located on the outer surface of the first groove 9 and is fixedly sleeved with a gear 11. An incomplete gear 12 is provided on the left outer surface of the gear 11, and the gear 11 is meshed with the incomplete gear 12. A half gear 13 is provided on the outer surface of the incomplete gear 12 near the front end, and the incomplete gear 12 is meshed with the half gear 13. The center positions of the incomplete gear 12 and the half gear 13 are fixedly sleeved with a first rotating shaft 14, and the two ends of the two first rotating shafts 14 are rotatably installed on the top and bottom of the inner wall of the first groove 9.

[0038] Furthermore, two first connecting plates 15 are fixedly installed on the ends away from the outer surfaces of the incomplete gear 12 and the half gear 13, and the two first connecting plates 15 are fixedly installed with a first connecting shaft 16 at one end away from the incomplete gear 12 and the half gear 13. The two first connecting shafts 16 are both located in the middle of the two first connecting plates 15 and are rotatably installed with a fixing plate 17 on the outer surface, and the two fixing plates 17 are fixedly installed with a fixing block 18 on the opposite surfaces of one end away from the two first connecting shafts 16. The opposite surfaces of the two fixing blocks 18 are fixedly installed with an anti-skid chain 19. The middle position of the two fixing plates 17 is rotatably installed with a second connecting shaft 20. The two ends of the two second connecting shafts 20 are located at the bottom and top outer surfaces of the first movable sleeve 7 and are rotatably installed with two second connecting plates 21. The two second connecting plates 21 are fixedly installed with a cylinder 22 at one end away from the two second connecting shafts 20. The inner walls of the two cylinders 22 are rotatably sleeved with a second rotating shaft 23, and the two ends of the two second rotating shafts 23 are fixedly installed on the top and bottom of the inner wall of the first groove 9.

[0039] Furthermore, the lifting device includes a first threaded rod 24, which is rotatably mounted on the bottom of the support plate 4 and located in the middle position on the right side of the optical axis 3. The end of the first threaded rod 24 away from the support plate 4 is rotatably mounted on the upper surface of the radial drill workbench 1. A first reversing motor 8 is fixedly mounted on the right side of the top of the support plate 4. The output end of the first reversing motor 8 passes through the support plate 4 and is rotatably connected to one end of the first threaded rod 24.

[0040] Furthermore, the translation device includes a second threaded rod 29, which is rotatably installed in the second groove 28. The outer surface of the second groove 28 is threadedly connected with a second movable sleeve 34, and the end of the second movable sleeve 34 away from the second threaded rod 29 is fixedly connected to the middle position of the top of the inner wall of the first movable sleeve 7. The end of the second groove 28 close to the optical axis 3 passes through the second groove 28 and enters the interior of the motor groove 6, and the outer surface of the second groove 28 located in the motor groove 6 is fixedly provided with a turbine 27, and the inside of the motor groove 6 is fixedly installed with a third reversing motor 25, and the output end of the third reversing motor 25 is fixedly installed with a worm 26, and the worm 26 is meshingly connected with the turbine 27.

[0041] Furthermore, the auxiliary translation device includes two sliding plates 33, and the two sliding plates 33 are fixedly installed on the front and rear ends of the inner wall of the first movable sleeve 7 at positions corresponding to the two convex grooves 31. The two sliding plates 33 are arranged to fit the protruding ends of the two convex grooves 31. Two wheels 32 are rotatably installed on both sides of the end of the two sliding plates 33 away from the first movable sleeve 7, and the two wheels 32 are slidably connected to the bottom of the inner walls of the two convex grooves 31.

[0042] Working principle: When fixing, start the second reverse motor 10, the second reverse motor 10 rotates to drive the gear 11 to rotate, the gear 11 rotates to drive the incomplete gear 12 to rotate, the fixing device housing 2 rotates to drive the first rotating shaft 14 to rotate, the fixing device housing 2 rotates to drive the half gear 13 to rotate, the half gear 13 rotates to drive the same first rotating shaft 14 to rotate, the incomplete gear 12 and the half gear 13 rotate to drive the two first connecting plates 15 on both sides to rotate with the incomplete gear 12 and the half gear 13 as the axis, the two first connecting plates 15 on both sides rotate with the incomplete gear 12 and the half gear 13 as the axis to drive the two fixing plates 17 to move forward, so that the two fixing plates 17 are on the two first connecting plates 17. The outer surface of the connecting shaft 16 rotates, the two fixed plates 17 move forward to drive the two second connecting plates 21 on both sides to move forward, the two second connecting plates 21 move forward to make the two second connecting shafts 20 rotate, the two second connecting plates 21 move forward to drive the two cylinders 22 to rotate on the outer surfaces of the two second rotating shafts 23, so that the two second connecting plates 21 rotate with the second rotating shafts 23 as the axis, and limit the position, so that the two fixed plates 17 move closer to the middle, the two first movable sleeves 7 move closer to the middle to drive the fixed blocks 18 move closer to the middle, the two fixed blocks 18 move closer to the middle to drive the anti-skid chains 19 move closer to the middle, thereby completing the fixation, and the parts that need to be drilled are fixed by the fixing device so that the equipment The punching is more stable, and workers do not need to fix it manually, thereby reducing the workload of workers. When punching, the third reversing motor 25 is started, and the output end of the third reversing motor 25 rotates to drive the worm 26 to rotate, and the worm 26 rotates to drive the turbine 27 to rotate, and the turbine 27 rotates the second threaded rod 29 to rotate, and the second threaded rod 29 rotates to drive the limit plate 30 to move, and the limit plate 30 moves to drive the first movable sleeve 7 to follow the movement, and the first movable sleeve 7 follows the movement to drive the sliding plate 33 to follow the movement, and the sliding plate 33 follows the movement to drive the wheel 32 to follow the movement, so that the wheel 32 and the sliding plate 33 slide on the inner wall of the convex groove 31, reducing the weight given by the equipment, and the first movable sleeve 7 follows the movement The drilling device is driven to follow the movement, and the drilling device is stopped after being moved to the position where a hole is to be drilled, and the first reversing motor 8 is started. The output end of the first reversing motor 8 rotates to drive the first threaded rod 24 to rotate, and the first threaded rod 24 rotates to drive the rocker arm 5 to move downward, and the rocker arm 5 moves downward and drives the device thereon to follow the movement. After the first movable sleeve 7 is brought close to the part to be drilled, the drilling device is started to drill holes, and the equipment is locked by the characteristics of the turbine 27 and the worm 26, which effectively prevents the force generated during the drilling process from causing the first movable sleeve 7 to move and cause deviations. At the same time, there is no need for employees to manually adjust the drilling position before fixing the drilling device, thereby increasing work efficiency.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A radial drill for drilling multiple holes simultaneously, comprising a radial drill workbench (1), characterized in that: A fixing device housing (2) is fixedly mounted on the right side of the upper surface of the radial drill workbench (1), a first groove (9) is provided near the middle position on the left side of the fixing device housing (2), and a fixing device is provided on the first groove (9); An optical axis (3) is fixedly installed at the middle position of the left side of the radial drilling workbench (1), a support plate (4) is fixedly installed at the right side of one end of the optical axis (3) away from the radial drilling workbench (1), and a lifting device is arranged on the support plate (4); The outer surface of the optical axis (3) is slidably sleeved with a rocker arm (5), a second groove (28) is provided at the middle position of the upper surface of the end of the rocker arm (5) away from the optical axis (3), a translation device is provided on the second groove (28), and a motor groove (6) is provided at the end of the second groove (28) close to the optical axis (3); The middle positions of the front and rear ends of the rocker arm (5) are both provided with convex grooves (31), and a limit plate (30) is fixedly mounted on one end of the rocker arm (5) away from the optical axis (3); The outer surface sliding sleeve of the rocker arm (5) is provided with a first movable sleeve (7), an auxiliary translation device is provided on the first movable sleeve (7), and a drilling device is fixedly installed on the bottom of the first movable sleeve (7).

2. A radial drill for drilling multiple holes simultaneously according to claim 1, characterized in that: The fixing device comprises a second reversing motor (10), the second reversing motor (10) is fixedly mounted at a bottom portion of the fixing device housing (2) close to the right side, and the second reversing motor (10) is fixedly mounted inside the radial drill workbench (1); The output end of the second reversing motor (10) penetrates the outer surface of the fixing device housing (2) and extends to the inside of the first groove (9). The output end of the second reversing motor (10) is located inside the first groove (9). The outer surface of the first groove (9) is fixed with a gear (11). The left outer surface of the gear (11) is provided with an incomplete gear (12). The gear (11) is meshed and connected with the incomplete gear (12). Wherein, a half gear (13) is arranged near the front end outer surface of the incomplete gear (12), and the incomplete gear (12) is meshedly connected with the half gear (13); The incomplete gear (12) and the half gear (13) are both fixedly sleeved with a first rotating shaft (14) at their center positions, and both ends of the two first rotating shafts (14) are rotatably mounted on the top and bottom of the inner wall of the first groove (9).

3. A radial drill for drilling multiple holes simultaneously according to claim 2, characterized in that: Two first connecting plates (15) are fixedly mounted on the ends of the outer surfaces of the incomplete gear (12) and the half gear (13) that are away from each other, and a first connecting shaft (16) is fixedly mounted on one end of the two first connecting plates (15) that is away from the incomplete gear (12) and the half gear (13), and a fixing plate (17) is rotatably mounted on the outer surface of the two first connecting shafts (16) located between the two first connecting plates (15), and a fixing block (18) is fixedly mounted on the opposite surface of the ends of the two fixing plates (17) that are away from the two first connecting shafts (16), and an anti-skid chain (19) is fixedly mounted on the opposite surfaces of the two fixing blocks (18); Among them, the middle position of the two fixed plates (17) is rotatably installed with a second connecting shaft (20), and the two ends of the two second connecting shafts (20) are located at the bottom and top outer surfaces of the first movable sleeve (7) and are rotatably installed with two second connecting plates (21), and the ends of the two second connecting plates (21) away from the two second connecting shafts (20) are fixedly installed with a cylinder (22), and the inner walls of the two cylinders (22) are rotatably sleeved with a second rotating shaft (23), and the two ends of the two second rotating shafts (23) are fixedly installed at the top and bottom of the inner wall of the first groove (9).

4. The radial drill for drilling multiple holes simultaneously according to claim 1, characterized in that: The lifting device comprises a first threaded rod (24), the first threaded rod (24) being rotatably mounted on the bottom of the support plate (4) and located in the middle position on the right side of the optical axis (3), and one end of the first threaded rod (24) away from the support plate (4) being rotatably mounted on the upper surface of the radial drilling workbench (1); A first reversing motor (8) is fixedly mounted on the right side of the top of the support plate (4), and an output end of the first reversing motor (8) passes through the support plate (4) and is rotatably connected to one end of the first threaded rod (24).

5. The radial drill for drilling multiple holes simultaneously according to claim 1, characterized in that: The translation device comprises a second threaded rod (29), the second threaded rod (29) is rotatably mounted inside the second groove (28), the outer surface of the second groove (28) is threadedly connected with a second movable sleeve (34), and one end of the second movable sleeve (34) away from the second threaded rod (29) is fixedly connected to the middle position of the top of the inner wall of the first movable sleeve (7); One end of the second groove (28) close to the optical axis (3) passes through the second groove (28) and enters the interior of the motor groove (6), and a turbine (27) is fixedly sleeved on the outer surface of the second groove (28) located inside the motor groove (6); A third reversing motor (25) is fixedly mounted inside the motor slot (6), a worm (26) is fixedly mounted at the output end of the third reversing motor (25), and the worm (26) is meshingly connected with the turbine (27).

6. The radial drill for drilling multiple holes simultaneously according to claim 1, characterized in that: The auxiliary translation device comprises two sliding plates (33), the two sliding plates (33) are fixedly mounted on the front and rear ends of the inner wall of the first movable sleeve (7) at positions corresponding to the two convex grooves (31), and the two sliding plates (33) are arranged to fit the protruding ends of the two convex grooves (31); Wherein, two wheels (32) are rotatably mounted on both sides of one end of the two sliding plates (33) away from the first movable sleeve (7), and the two wheels (32) are slidably connected to the bottom of the inner walls of the two convex grooves (31).

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