Anti-skidding pole climbing climber

Abstract

The invention relates to an anti-skid pole climbing climber which comprises a pedal part, a fixed arm, a sliding arm and an inner anti-skid piece. The inner anti-skid piece comprises a device shell, an extrusion device, a movable nail plate and a locking device; the device shell comprises a rectangular shell, a small rectangular shell and the like; the extrusion device comprises a driven worm gear, an inner threaded hole, an outer threaded pipe, a rectangular end block, a driving inclined surface and a driving worm; the movable nail plate comprises a nail plate body containing groove, a driven slope and the like. According to the anti-skid pole climbing climber, enough contact friction force is generated on the outer wall of a telegraph pole through two points of the outer anti-skid strips and the inner anti-skid pieces, and then climbing is achieved. According to the anti-skid pole climbing climber, the fixed mode switching between the inner anti-skid piece and the outer wall of the telegraph pole can be achieved by adjusting the position of the movable nail plate, in the normal state, the inner anti-skid strips make friction contact with the telegraph pole, and in the ice and snow weather, the movable nail plate can be adjusted to move leftwards, so that the inner anti-skid pieces make friction contact with the telegraph pole; and the anti-skid nail head is used for realizing insertion and fixation with the sharp nail between the telegraph pole.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to an anti-slip pole climbing foot buckle. Background Art

[0002] The anti-skid pole climbing foot buckle is a safety tool used for climbing cement poles for power and postal lines. It is designed to solve the problem that traditional foot buckles are prone to slipping in bad weather conditions and ensure the safety of operators. The design and improvement of the anti-skid pole climbing foot buckle are mainly focused on improving safety. The safety improvement of the anti-skid pole climbing foot buckle mainly relies on increasing friction, that is, setting up anti-skid foot pads. However, in icy and snowy weather, when thin ice forms on the poles, anti-skid spikes need to be set. Therefore, it is necessary to set up a pole climbing foot buckle that can have sufficient friction and can also prevent slipping through anti-skid spikes. Summary of the invention

[0003] An anti-slip pole climbing foot buckle, comprising:

[0004] The pedal part at least comprises a bottom plate and side plates arranged on the left and right sides of the bottom plate;

[0005] A fixed arm is fixedly arranged below the bottom plate, and comprises a fixed arm body fixedly connected to the bottom plate, and a horizontal insertion tube arranged at the stop end of the fixed arm body;

[0006] The sliding arm comprises a horizontal arm slidably arranged in the horizontal insertion tube, a bending arm arranged at the left rear of the horizontal arm, and an outer anti-slip strip arranged at the inner side of the bending arm for frictionally contacting the electric pole;

[0007] The inner anti-slip part is arranged on the left side of the lower end surface of the bottom plate and is used for frictionally contacting the electric pole. The inner anti-slip part includes:

[0008] The device shell comprises a rectangular shell, wherein a guide core shaft is respectively arranged at the front and rear of the left inner wall of the rectangular shell, a rectangular small shell is also arranged at the right side of the rectangular shell, the right side of the rectangular small shell is exposed at the right side of the rectangular shell, a small shell front hole is arranged at the part of the front end surface of the rectangular small shell located in the rectangular shell, a small shell longitudinal hole is also arranged in the longitudinal direction in the rectangular small shell, a central square rod is also arranged at the rear end of the rectangular small shell through the small shell front hole, an inner anti-slip strip is arranged at the left side of the outer wall of the rectangular shell, a side nail hole penetrating the side wall and the inner anti-slip strip is arranged at the left side of the rectangular shell, and the front end of the central square rod is connected to the front end surface of the inner wall of the rectangular shell;

[0009] The extrusion device comprises a driven worm wheel rotatably arranged in a rectangular small shell, an internal threaded hole formed on the inner wall of the driven worm wheel, an external threaded tube slidably sleeved on the central square rod, the external threaded tube passes through the front hole of the small shell and is screwed with the internal threaded hole, a rectangular body end block is arranged in front of the external threaded tube, an active inclined surface inclined from the right front to the left rear is arranged in front of the left front of the rectangular body end block, a driving worm matched with the driven worm wheel is rotatably arranged in the right half of the rectangular small shell, and the external threaded tube is provided with a central square hole matched with the central square rod;

[0010] The movable nail plate includes a nail plate body slidably arranged in a rectangular shell, a receiving groove arranged on the right side of the nail plate body, a driven inclined surface formed in front of the receiving groove and cooperating with the active inclined surface, and guide holes for accommodating corresponding guide core shafts are respectively arranged at the front and rear of the left side of the nail plate body. A reset compression spring is also arranged at the bottom of the guide hole, and an anti-slip nail head is also arranged on the left side of the nail plate body in a one-to-one correspondence with the side nail holes.

[0011] As a further implementation:

[0012] The active worm is also provided with a locking device, which includes:

[0013] A spring inner cavity, arranged in the active worm;

[0014] There are two rod inner locking rings, one at the upper end and one at the lower end of the spring inner cavity;

[0015] There are two rod internal plug holes, and the middle part of each rod internal locking ring is provided with one rod internal plug hole;

[0016] A locking compression spring, arranged in the inner cavity of the spring;

[0017] There are two unlocking assemblies, one unlocking assembly is provided at the upper end and the lower end of the spring inner cavity respectively, the unlocking assembly includes an unlocking circular tube slidably inserted in the corresponding rod inner plug hole and the small shell longitudinal hole, limiting side holes circumferentially evenly distributed on the outer wall of the unlocking circular tube, and limiting plugs circumferentially evenly distributed on the corresponding inner wall of the small shell longitudinal hole and plugged into the limiting side holes. The inner side of the unlocking circular tube is also provided with a sliding locking ring that locks with the locking ring in the rod.

[0018] As a further implementation:

[0019] The locking device also includes a damping adjustment component arranged in the unlocking assembly located below, and the damping adjustment component includes a rotatable inner tube shaft arranged in the unlocking circular tube, a shaft ring groove arranged on the outer wall of the inner tube shaft, a limiting inner ring arranged on the inner wall of the unlocking circular tube and rotatably matched with the shaft ring groove, a shaft screw hole arranged in the inner tube shaft, an adjusting screw screwed in the shaft screw hole, a through horizontal hole arranged in the adjusting screw, a through horizontal rod arranged on the inner wall of the unlocking circular tube and passing through the through horizontal hole, and a compression spring baffle arranged on the inner side of the adjusting screw and abutting against the locking compression spring.

[0020] Beneficial effects:

[0021] The anti-skid pole climbing foot buckle described in this case generates sufficient contact friction on the outer wall of the pole through the outer anti-skid strip and the inner anti-skid part, thereby achieving climbing.

[0022] The anti-slip pole climbing foot buckle described in this case can also switch the fixing mode between the inner anti-slip part and the outer wall of the utility pole by adjusting the position of the movable nail plate: under normal circumstances, the inner anti-slip strip is in friction contact with the utility pole. In icy and snowy weather, the movable nail plate can be adjusted to move to the left, and the anti-slip nail head can be used to achieve sharp nail insertion and fixation with the utility pole.

[0023] The anti-slip pole climbing foot buckle described in this case, under normal circumstances, the locking active worm gear locks its rotational freedom through the upper and lower unlocking assemblies. Only by pressing the two unlocking assemblies at the same time can the rotational freedom of the active worm gear be unlocked, and finally the movable nail plate is adjusted to move to the left. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of an embodiment of the anti-slip pole climbing foot buckle.

[0025] Figure 2 It is a top view of an embodiment of the anti-slip pole climbing foot buckle.

[0026] Figure 3 It is a rear view of an embodiment of the anti-slip pole climbing foot buckle.

[0027] Figure 4 It is a schematic diagram of an embodiment of the inner anti-slip part.

[0028] Figure 5 It is a cross-sectional view of an embodiment of the inner anti-slip component.

[0029] Figure 6 It is a cross-sectional view of an embodiment of the inner anti-slip component.

[0030] Figure 7 It is a cross-sectional view of an embodiment of the device housing.

[0031] Figure 8 yes Figure 6 A cross-sectional view of the first embodiment along section AA.

[0032] Fig. 9 yes Figure 6 Partial cross-sectional view of the first state of section AA.

[0033] Fig.10 yes Figure 6 Partial cross-sectional view of the second state of section AA.

[0034] Fig.11 yes Figure 6 Partial cross-sectional view of the AA section in the third state.

[0035] In the figure:

[0036] 9. footrest, 91. bottom plate, 92. side plate;

[0037] 8. Fixed arm, 81. Fixed arm body, 82. Horizontally placed insert;

[0038] 7. Sliding arm, 71. Horizontal and vertical arm, 72. Bending arm, 73. External anti-slip strip;

[0039] 6. Inner anti-slip parts;

[0040] 1. Device housing, 11. Rectangular housing, 12. Guide mandrel, 13. Rectangular small housing, 14. Front hole of small housing, 15. Vertical hole of small housing, 16. Central square rod, 17. Inner anti-slip strip, 18. Side nail hole, 19. Connecting side plate;

[0041] 2. Extrusion device, 21. Driven worm gear, 22. Internal threaded hole, 23. External threaded tube, 24. Rectangular body end block, 25. Active ramp, 26. Active worm;

[0042] 3. movable nail plate, 31. nail plate body, 32. receiving groove, 33. driven inclined surface, 34. guide plug hole, 35. reset spring, 36. anti-slip nail head;

[0043] 4. Locking device;

[0044] 41. Spring cavity;

[0045] 42. Locking ring inside the rod;

[0046] 43. Socket inside the rod;

[0047] 44. Locking compression spring;

[0048] 45. unlocking assembly, 451. unlocking round tube, 452. limiting side hole, 453. limiting plug, 454. sliding lock ring;

[0049] 46. ​​Damping adjustment assembly, 461. Rotating shaft in the tube, 462. Rotating shaft ring groove, 463. Limiting inner ring, 464. Rotating shaft screw hole, 465. Adjusting screw, 466. Through horizontal hole, 467. Through horizontal rod, 468. Compression spring baffle;

[0050] 47. Positioning device, 471. Positioning ring groove, 472. Protruding ring with hole. DETAILED DESCRIPTION

[0051] In the anti-skid pole climbing foot buckle described in this case, the footrest 9 is used to place the foot, and the sliding arm 7 can be pulled out to the left until there is a sufficient gap between the sliding arm 7 and the fixed arm 8 to accommodate the electric pole. The outer anti-skid strip 73 and the inner anti-skid member 6 abut against the left and right sides of the electric pole to generate sufficient friction so that the foot buckle is stable on the electric pole.

[0052] An anti-slip pole climbing foot buckle, comprising:

[0053] The pedal part 9 at least includes a bottom plate 91 and side plates 92 arranged on the left and right sides of the bottom plate 91;

[0054] The fixed arm 8 is fixedly disposed below the bottom plate 91, and the fixed arm 8 comprises a fixed arm body 81 fixedly connected to the bottom plate 91, and a transverse insertion tube 82 disposed at the end of the fixed arm body 81;

[0055] The sliding arm 7 comprises a horizontal arm 71 slidably disposed in the horizontal insertion tube 82, a bending arm 72 disposed at the left rear of the horizontal arm 71, and an outer anti-slip strip 73 disposed at the inner side of the bending arm 72 for frictionally contacting the electric pole;

[0056] The inner anti-slip member 6 is arranged on the left side of the lower end surface of the bottom plate 91 to frictionally contact the electric pole. The inner anti-slip member 6 includes:

[0057] The device housing 1 comprises a rectangular shell 11, wherein a guide mandrel 12 is respectively arranged at the front and rear of the left inner wall of the rectangular shell 11, a rectangular small shell 13 is also arranged at the right side of the rectangular shell 11, and the right side of the rectangular small shell 13 is exposed at the right side of the rectangular shell 11, and a small shell front hole 14 is arranged at the part of the front end surface of the rectangular small shell 13 located in the rectangular shell 11, and a small shell longitudinal hole 15 is also arranged in the longitudinal direction in the rectangular small shell 13, and a central square rod 16 is also arranged at the rear end of the rectangular small shell 13 through the small shell front hole 14, an inner anti-slip strip 17 is arranged at the left side of the outer wall of the rectangular shell 11, and a side nail hole 18 is arranged through the side wall and the inner anti-slip strip 17 on the left side of the rectangular shell 11, and the front end of the central square rod 16 is connected to the front end surface of the inner wall of the rectangular shell 11;

[0058] The extrusion device 2 comprises a driven worm wheel 21 rotatably arranged in a rectangular small shell 13, an internal threaded hole 22 formed on the inner wall of the driven worm wheel 21, an external threaded tube 23 slidably sleeved on the central square rod 16, the external threaded tube 23 passes through the front hole 14 of the small shell and is screwed with the internal threaded hole 22, a rectangular body end block 24 is arranged in front of the external threaded tube 23, and an active inclined surface 25 inclined from the right front to the left rear is arranged in front of the left side of the rectangular body end block 24, and an active worm 26 cooperating with the driven worm wheel 21 is rotatably arranged on the right half of the rectangular small shell 13, and the external threaded tube 23 is provided with a central square hole cooperating with the central square rod 16;

[0059] The movable nail plate 3 includes a nail plate body 31 slidably arranged in a rectangular shell 11, a receiving groove 32 arranged on the right side of the nail plate body 31, and a driven inclined surface 33 formed in front of the receiving groove 32 and cooperating with the active inclined surface 25. The front and rear sides of the left side of the nail plate body 31 are respectively provided with guide holes 34 for accommodating the corresponding guide core shaft 12. A reset compression spring 35 is also provided at the bottom of the guide hole 34. The left side of the nail plate body 31 is also provided with an anti-slip nail head 36 arranged in a one-to-one correspondence with the side nail hole 18.

[0060] As a further implementation:

[0061] The active worm 26 is also provided with a locking device 4, and the locking device 4 includes:

[0062] A spring inner cavity 41 is provided in the active worm 26;

[0063] Two rod inner locking rings 42 are provided, and one rod inner locking ring 42 is provided at the upper end and the lower end of the spring inner cavity 41 respectively;

[0064] There are two rod inner plug holes 43, and each rod inner locking ring 42 has one rod inner plug hole 43 in the middle thereof;

[0065] A locking compression spring 44, disposed in the spring inner cavity 41;

[0066] There are two unlocking assemblies 45, one unlocking assembly 45 is respectively provided at the upper end and the lower end of the spring inner cavity 41, and the unlocking assembly 45 includes an unlocking circular tube 451 slidably inserted in the corresponding rod inner plug hole 43 and the small shell longitudinal hole 15, limiting side holes 452 circumferentially evenly distributed on the outer wall of the unlocking circular tube 451, and limiting plugs 453 circumferentially evenly distributed on the inner wall of the corresponding small shell longitudinal hole 15 and plugged into the limiting side holes 452. The inner side of the unlocking circular tube 451 is also provided with a sliding locking ring 454 that locks with the locking ring 42 in the rod.

[0067] As a further implementation:

[0068] The locking device 4 also includes a damping adjustment component 46 arranged in the unlocking assembly 45 located below, and the damping adjustment component 46 includes an inner tube rotating shaft 461 rotatably arranged in the unlocking circular tube 451, a rotating shaft ring groove 462 arranged on the outer wall of the inner tube rotating shaft 461, a limiting inner ring 463 arranged on the inner wall of the unlocking circular tube 451 and rotatably matched with the rotating shaft ring groove 462, a rotating shaft screw hole 464 arranged in the inner tube rotating shaft 461, an adjusting screw 465 screwed in the rotating shaft screw hole 464, a through transverse hole 466 arranged in the adjusting screw 465, a through transverse rod 467 arranged on the inner wall of the unlocking circular tube 451 and passing through the through transverse hole 466, and a compression spring baffle 468 arranged on the inner side of the adjusting screw 465 and abutting against the locking compression spring 44.

[0069] As a further implementation:

[0070] A connecting side plate 19 is provided above the front end surface and the right end surface of the rectangular shell 11 .

[0071] As a further implementation:

[0072] The active worm 26 is also provided with a positioning device 47 , which includes a positioning ring groove 471 provided on the outer wall of the active worm 26 , and a perforated convex ring 472 rotatably matched with the positioning ring groove 471 is provided on the right side of the rectangular small shell 13 .

[0073] As a further implementation:

[0074] A driven gear 48 is further disposed at the lower half of the driving worm 26 , and a driving gear 49 meshing with the driven gear 48 is disposed at the lower end surface of the rectangular housing 11 .

[0075] There are two modes of fixation between the inner anti-slip member 6 and the electric pole: friction fixation and nail head fixation.

[0076] Mode 1, friction fixation:

[0077] As the instruction manual Figure 6 As shown:

[0078] Under normal conditions, the rectangular end block 24 and the active inclined surface 25 are at the rear, the return compression spring 35 squeezes the guide socket 34 and drives the nail plate body 31 and the anti-slip nail head 36 to move to the right, and the anti-slip nail head 36 is on the right side of the inner anti-slip strip 17, and the inner anti-slip strip 17 directly contacts the electric pole to generate friction.

[0079] Mode 2, nail head fixation:

[0080] S1, unlocking the rotational freedom of the active worm 26:

[0081] Press the two unlocking assemblies 45 at the same time to make them retract inwards to overcome the damping of the locking compression spring 44, so that the inner locking ring 42 and the sliding locking ring 454 of the rod are out of contact, thereby unlocking the rotational freedom of the unlocking 26;

[0082] S2, extend the movable nail plate 3:

[0083] As the instruction manual Figure 8-11 As shown:

[0084] The driving gear 49 is rotated to drive the driven gear 48 and the driving worm 26 to rotate, and the driven worm wheel 21 and the internal threaded hole 22 to rotate, and the external threaded tube 23, the rectangular body end block 24, and the driving inclined plane 25 to move forward;

[0085] The active inclined surface 25 acts on the driven inclined surface 33 to drive the nail plate body 31, the accommodating groove 32, the driven inclined surface 33, and the anti-slip nail head 36 to overcome the damping of the return compression spring 35 and move leftward. The anti-slip nail head 36 is exposed on the left side of the inner anti-slip strip 17. The anti-slip nail head 36 directly contacts the electric pole and is fixed by the nail head.

[0086] As a further implementation scheme, the active worm 26 is normally double locked by two unlocking assemblies 45, and can be unlocked by pressing the two unlocking assemblies 45 at the same time:

[0087] It should be noted that the damping of pressing the unlocking assembly 45 can be adjusted in this case:

[0088] The rotating shaft 461 and the rotating shaft screw hole 464 in the rotating tube drive the adjusting screw 465 and the compression spring baffle 468 to move relative to the unlocking assembly 45, adjust the compression amount and elastic force of the locking compression spring 44 under normal conditions, and then adjust the damping when pressing the two unlocking assemblies 45.

[0089] It should be noted that a groove is provided on the bottom plate 91 at a position corresponding to the unlocking circular tube 451 to facilitate squeezing the unlocking assembly 45 .

Claims

1. A non-slip pole climbing foot buckle, characterized by: include: The pedal part (9) at least comprises a bottom plate (91) and side plates (92) arranged on the left and right sides of the bottom plate (91); A fixed arm (8) is fixedly arranged below the bottom plate (91), and the fixed arm (8) comprises a fixed arm body (81) fixedly connected to the bottom plate (91), and a transverse insertion tube (82) arranged at the stop end of the fixed arm body (81); The sliding arm (7) comprises a horizontal arm (71) slidably arranged in the horizontal insertion tube (82), a bending arm (72) arranged at the left rear of the horizontal arm (71), and an outer anti-slip strip (73) arranged at the inner side of the bending arm (72) for frictionally contacting the electric pole; The inner anti-slip part (6) is arranged on the left side of the lower end surface of the bottom plate (91) and is used for frictionally contacting the electric pole.

2. The anti-slip pole climbing foot buckle according to claim 1, characterized in that: The inner anti-slip member (6) comprises: The device shell (1) comprises a rectangular shell (11), wherein a guide core shaft (12) is respectively arranged at the front and rear of the left inner wall of the rectangular shell (11), a rectangular small shell (13) is also arranged at the right side of the rectangular shell (11), and the right side of the rectangular small shell (13) is exposed at the right side of the rectangular shell (11), and a small shell front hole (14) is arranged at the front end surface of the rectangular small shell (13) located in the rectangular shell (11), and a small shell longitudinal hole (15) is also arranged in the longitudinal direction in the rectangular small shell (13), and a central square rod (16) is also arranged at the rear end of the rectangular small shell (13) and is arranged through the small shell front hole (14), an inner anti-slip strip (17) is arranged at the left side of the outer wall of the rectangular shell (11), and a side nail hole (18) is arranged on the left side of the rectangular shell (11) and is arranged through the side wall and the inner anti-slip strip (17), and the front end of the central square rod (16) is connected to the front end surface of the inner wall of the rectangular shell (11); The extrusion device (2) comprises a driven worm wheel (21) rotatably arranged in a rectangular small shell (13), an internal threaded hole (22) formed on the inner wall of the driven worm wheel (21), an external threaded tube (23) slidably sleeved on the central square rod (16), the external threaded tube (23) passes through the front hole (14) of the small shell and is screwed with the internal threaded hole (22), a rectangular body end block (24) is arranged in front of the external threaded tube (23), and an active inclined surface (25) inclined from the right front to the left rear is arranged at the left front of the rectangular body end block (24), and the right half of the rectangular small shell (13) is also rotatably provided with an active worm (26) cooperating with the driven worm wheel (21), and the external threaded tube (23) is provided with a central square hole cooperating with the central square rod (16); The movable nail plate (3) comprises a nail plate body (31) slidably arranged in a rectangular shell (11), a receiving groove (32) arranged on the right side of the nail plate body (31), and a driven inclined surface (33) formed in front of the receiving groove (32) and cooperating with the active inclined surface (25). The front and rear sides of the left side of the nail plate body (31) are respectively provided with guide holes (34) for accommodating corresponding guide core shafts (12). The bottom of the guide holes (34) is also provided with a return pressure spring (35). The left side of the nail plate body (31) is also provided with an anti-slip nail head (36) arranged one-to-one with the side nail holes (18).

3. The anti-slip pole climbing foot buckle according to claim 2, characterized in that: The active worm (26) is also provided with a locking device (4), and the locking device (4) comprises: A spring inner cavity (41) is arranged in the active worm (26); Two rod inner locking rings (42) are provided, and one rod inner locking ring (42) is provided at the upper end and the lower end of the spring inner cavity (41) respectively; Two rod inner plug holes (43) are provided, and a rod inner plug hole (43) is provided in the middle of each rod inner lock ring (42); A locking compression spring (44) is arranged in the spring inner cavity (41); The unlocking assembly (45) is provided with two, and one unlocking assembly (45) is provided at the upper end and the lower end of the spring inner cavity (41), respectively. The unlocking assembly (45) comprises an unlocking circular tube (451) slidably inserted in the corresponding rod inner plug hole (43) and the small shell longitudinal hole (15), limiting side holes (452) uniformly distributed circumferentially on the outer wall of the unlocking circular tube (451), and limiting plugs (453) uniformly distributed circumferentially on the inner wall of the corresponding small shell longitudinal hole (15) and plugged with the limiting side holes (452). The inner side of the unlocking circular tube (451) is also provided with a sliding lock ring (454) that is locked with the rod inner lock ring (42).

4. The anti-slip pole climbing foot buckle according to claim 3, characterized in that: The locking device (4) further comprises a damping adjustment component (46) arranged in the unlocking assembly (45) located below, the damping adjustment component (46) comprising an inner tube rotating shaft (461) rotatably arranged in the unlocking circular tube (451), a rotating shaft ring groove (462) arranged on the outer wall of the inner tube rotating shaft (461), a limiting inner ring (463) arranged on the inner wall of the unlocking circular tube (451) and rotatably matched with the rotating shaft ring groove (462), and a A rotating shaft screw hole (464) in the rotating shaft (461) in the tube, an adjusting screw (465) screwed in the rotating shaft screw hole (464), a through transverse hole (466) provided in the adjusting screw (465), a through transverse rod (467) provided on the inner wall of the unlocking circular tube (451) and passing through the through transverse hole (466), and a compression spring baffle (468) provided on the inner side of the adjusting screw (465) and abutting against the locking compression spring (44).

5. The anti-slip pole climbing foot buckle according to claim 4, characterized in that: A connecting side plate (19) is provided above the front end surface and the right end surface of the rectangular shell (11).

6. The anti-slip pole climbing foot buckle according to claim 5, characterized in that: The active worm (26) is also provided with a positioning device (47), and the positioning device (47) comprises a positioning ring groove (471) provided on the outer wall of the active worm (26), and a convex ring with a hole (472) rotatably matched with the positioning ring groove (471) is provided on the right side of the rectangular small shell (13).

7. The anti-slip pole climbing foot buckle according to claim 6, characterized in that: The lower half of the active worm (26) is also provided with a driven gear (48), and the lower end surface of the rectangular housing (11) is provided with a driving gear (49) meshing with the driven gear (48).

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