Descender with worm

Abstract

The utility model discloses a descender with a worm, and belongs to the technical field of lifting devices. A descender with a worm comprises a fixed side plate, a movable side plate, a rotating sleeve, a wheel seat assembly, a handle assembly and a gear assembly. The movable side plate is rotationally connected with the fixed side plate through the rotary sleeve, and the wheel seat assembly is installed between the fixed side plate and the movable side plate. The gear assembly is installed on the side, away from the wheel seat assembly, of the fixed side plate and is in linkage installation with the wheel seat assembly. A sliding groove is formed in the fixed side plate in a penetrating mode. The gear assembly comprises a shell, an input worm is installed in the shell, the input worm is in transmission connection with a worm gear, the center of the worm gear is fixedly connected with a first wheel shaft, and the first wheel shaft sequentially penetrates through the sliding grooves in the fixed side plates and is installed and connected with the wheel seat assembly; the handle assembly and the first wheel shaft are installed in a linkage mode, and the first wheel shaft drives the wheel seat assembly to slide along the sliding groove. Through the arrangement, rotation of the rope wheel can be controlled through the gear assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting devices, and more specifically relates to a descender with a worm. Background Art

[0002] Descenders are commonly used in outdoor sports, firefighting, and rescue operations. By increasing the friction between the rope and the equipment, they effectively slow the descent, protecting the operator from falls. While highly safe, proper operation is crucial. Failure to master proper techniques or improper operation can lead to accidents. Therefore, a descender with control over the sheave's rotation is essential to prevent loss of control. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a descender with a worm, which can control the rotation of the rope wheel through a gear assembly.

[0004] The utility model discloses a descender with a worm, comprising a fixed side plate, a movable side plate, a rotating sleeve, a wheel seat assembly, a handle assembly and a gear assembly; the movable side plate is rotatably connected to the fixed side plate through the rotating sleeve, and the wheel seat assembly is installed between the fixed side plate and the movable side plate; the gear assembly is installed on a side of the fixed side plate away from the wheel seat assembly and is installed in linkage with the wheel seat assembly;

[0005] A slide groove is provided on the fixed side plate; the gear assembly includes a housing, an input worm is installed in the housing, the input worm is connected to the worm gear, the center of the worm gear is fixedly connected to the first wheel shaft, the first wheel shaft passes through the slide groove on the fixed side plate in sequence, and is installed and connected to the wheel seat assembly; the handle assembly is installed in linkage with the first wheel shaft, and the wheel seat assembly is driven to slide along the slide groove through the first wheel shaft.

[0006] As a further improvement of the present invention, the wheel seat assembly includes a wheel seat and a pulley; one end of the wheel seat is arranged in a circular ring, and the pulley cover is arranged on the circular ring of the wheel seat; the first wheel shaft passes through the slide groove, wheel seat and pulley arrangement on the fixed side plate in sequence; the worm gear drives the pulley to rotate through the first wheel shaft.

[0007] As a further improvement of the present invention, a ring block is fixedly provided on the circular ring of the wheel seat, and an inner gear is sleeved on the outer circumference of the ring block; a plurality of mounting grooves are provided on the outer circumference of the ring block, and the mounting grooves are arranged at intervals on the outer circumference of the ring block; a ratchet is embedded in one end of the mounting groove, and a spring is embedded in the other end of the mounting groove, and the spring and the ratchet are arranged in abutment; teeth are provided on the outer side wall of the ratchet away from the spring; and the ratchet is meshed and connected with the inner gear;

[0008] The sheave cover is arranged on the outer periphery of the internal gear and is installed and connected with the internal gear.

[0009] As a further improvement of the present invention, the handle assembly includes a handle, a connecting rod, a handle shaft and a connecting rod shaft; the handle is rotatably connected to the fixed side plate through the handle shaft; the connecting rod is rotatably connected to the handle through the connecting rod shaft; the connecting rod is linked to one end of the first wheel axle extending out of the outer wall of the fixed side plate to drive the first wheel axle to slide back and forth in the slide groove.

[0010] As a further improvement of the present invention, a second card slot and a rotation slot are respectively provided on the side of the handle facing the fixed side plate; the rotation slot is connected to the second card slot; one end of the connecting rod is rotatably embedded in the rotation slot;

[0011] The handle assembly also includes a first spring; the first spring is embedded in the second slot, and both ends of the first spring are abutted against the inner wall of the second slot; the end of the connecting rod away from the rotating slot of the handle is bent or folded to form a bend; a connecting column is fixedly provided on the outer wall of the end of the connecting rod away from the bend, and a clamping column is fixedly provided on one side of the connecting column; one end of the first spring is abutted against the inner wall of the second slot; the other end of the first spring is sleeved on the clamping column and abutted against the connecting column, and the clamping column extends into the interior of the first spring.

[0012] As a further improvement of the present invention, a protrusion is provided in the middle portion of the connecting rod or in an area adjacent to the middle portion; the protrusion and the bend are provided on the same side of the connecting rod, and a first groove is formed between the protrusion and the bend; the first groove is mounted in linkage with one end of the first wheel axle extending outward from the outer side wall of the fixed side plate;

[0013] The handle is provided with a connecting groove running through it from the outside to the inside; the connecting groove, the second clamping groove and the rotating groove are provided at the same end of the handle; one end of the handle rotating shaft passes through the connecting groove and is rotatably connected to the handle; the other end of the handle rotating shaft passes through the fixed side plate and is rotatably connected to the fixed side plate;

[0014] The handle assembly also includes a handle torsion spring, which is sleeved on the outer periphery of the handle shaft and arranged between the handle and the fixed side plate.

[0015] As a further improvement of the present invention, it also includes a friction block and a switch assembly; the friction block is installed between the fixed side plate and the movable side plate; the friction block is provided with a second slot; the movable side plate is provided with a first hole; the switch assembly passes through the first hole and the second slot in sequence, and is slidably embedded in the second slot.

[0016] As a further improvement of the present invention, the switch assembly includes a button, a receiving seat, a cross bar and a second spring; the receiving seat is slidably embedded in the second slot; a first through hole is formed at the top of the receiving seat, and a third through hole is formed at the bottom of the receiving seat; two second through holes are respectively formed on both sides of the receiving seat, and the two second through holes are arranged opposite to each other; the two ends of the cross bar respectively pass through the corresponding second through holes and are mounted in the first through hole; a third groove is formed at the lower end of the button; the lower end of the button is embedded in the first through hole, and the third groove slidably covers the outer circumference of the cross bar; the second spring is embedded in the third through hole, and the other end of the second spring is abutted against the bottom of the second slot;

[0017] The switch assembly also includes a limiter; a second limiter groove is provided on the outer peripheral side wall of the receiving seat; one end of the limiter is slidably embedded in the second limiter groove, and the other end of the limiter sequentially passes through the side wall of the second slot and is installed and connected with the friction block.

[0018] As a further improvement of the present invention, the invention further comprises a hanging hole fixing block, which is arranged between the fixed side plate and the movable side plate; the friction block and the hanging hole fixing block are respectively fixedly arranged on the side walls of the fixed side plate on both sides of the wheel seat assembly; the outer sides of the friction block and the hanging hole fixing block are both provided with corresponding wire grooves for the rope to pass through;

[0019] The wire grooves of the friction block and the hanging hole fixing block are arranged relative to each other.

[0020] As a further improvement of the present invention, it also includes a movable friction block; the movable friction block is rotatably connected to the fixed side plate; the movable friction block includes a main body and a blocking block; one end of the main body is installed and connected to the fixed side plate; the other end of the main body is fixedly connected to the blocking block, and the blocking block is mounted on the outer side of the friction block through the main body.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the present invention is provided with a gear assembly, the input worm of the gear assembly drives the input worm to rotate, the rotation of the input worm drives the worm gear to rotate, thereby driving the rope pulley on the first wheel shaft to rotate; because the input worm can drive the worm gear, but the worm gear cannot drive the input worm in reverse, it is precisely because of this characteristic of the worm that dangerous accidents caused by reverse rotation can be effectively prevented;

[0022] The inner gear ring of the wheel seat assembly cooperates with the ratchet and spring assembled on the ring block, so that the rope wheel can only rotate in one direction, preventing the rope wheel from rotating suddenly;

[0023] The handle of the handle assembly controls the first rotating shaft to slide back and forth along the sliding groove of the fixed side plate through a connecting rod, and one end of the connecting rod is also connected to the first spring. The first spring cooperates with the connecting rod to automatically reset the connecting rod after the anti-panic function is performed to prevent the operator from losing control of the descender due to an emergency or excessive operation of the handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is one of the schematic diagrams of the structure of the descender of the present utility model;

[0025] Figure 2 This is one of the schematic diagrams of the local structure of the descender of the present utility model;

[0026] Figure 3 This is the second schematic diagram of the local structure of the descender of the present utility model;

[0027] Figure 4 This is the third schematic diagram of the local structure of the descender of the present utility model;

[0028] Figure 5 This is one of the schematic diagrams of the explosion structure of the descender of the present utility model;

[0029] Figure 6 This is a schematic diagram of the handle structure of the utility model;

[0030] Figure 7 This is a schematic diagram of the exploded structure of the wheel seat assembly of the present invention;

[0031] Figure 8 This is the second schematic diagram of the descender structure of the present utility model;

[0032] Figure 9 This is one of the schematic diagrams of the partial cross-section structure of the descender of the present utility model;

[0033] Figure 10 This is the second schematic diagram of the partial cross-sectional structure of the descender of the present utility model;

[0034] Figure 11 This is the fourth schematic diagram of the partial structure of the descender of the present utility model;

[0035] Figure 12 This is the fourth schematic diagram of the structure of the descender of the present utility model;

[0036] Figure 13 This is the fifth schematic diagram of the local structure of the descender of the present utility model.

[0037] Description of the numbers in the figure:

[0038] 1. Movable side panel; 2. Fixed side panel; 21. Slideway; 3. Handle assembly; 31. Handle; 311. Second slot; 32. Connecting rod; 321. First groove; 322. Connecting column; 323. Clamping column; 33. First spring; 34. Plunger; 35. Handle shaft; 36. Handle torsion spring; 37. First limiter; 38. Connecting rod shaft; 5. Movable friction block; 6. Rotating sleeve; 7. Side panel gasket; 8. Wheel seat assembly; 81. Wheel seat; 82. Sheave; 83. Pulley Gasket; 84, ring block; 85, internal gear; 86, ratchet; 87, spring; 88, first axle; 9, friction block; 10, switch assembly; 101, button; 1011, third groove; 102, receiving seat; 1021, second through hole; 1022, second limiting groove; 103, limiting member; 104, cross bar; 105, second spring; 11, hanging hole fixing block; 12, gear assembly; 121, input worm; 122, worm gear; 123, electric drill connection port. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the embodiments. The following embodiments are intended to explain the present invention, but the present invention is not limited to the following embodiments.

[0040] Specific embodiment 1: Please refer to Figure 1-13 A descender with a worm comprises a fixed side plate 2, a movable side plate 1 and a rotating sleeve 6; the movable side plate 1 is rotatably connected to the fixed side plate 2 through the rotating sleeve 6; one end of the rotating sleeve 6 passes through one end of the fixed side plate 2 and is installed and connected to the fixed side plate 2; the other end of the rotating sleeve 6 passes through the movable side plate 1 and is rotatably connected to the movable side plate 1; a side plate gasket 7 is provided on the outer periphery of the rotating sleeve 6, and the side plate gasket 7 is arranged between the fixed side plate 2 and the movable side plate 1.

[0041] The descender further includes a gear assembly 12 ; the gear assembly 12 is mounted on a side of the fixed side plate 2 away from the wheel seat assembly 8 , and is installed in linkage with the wheel seat assembly 8 .

[0042] The descender also includes a handle assembly 3 and a wheel seat assembly 8. The wheel seat assembly 8 is installed between the fixed side plate 2 and the movable side plate 1; the handle assembly 3 is installed on the side of the fixed side plate 2 away from the wheel seat assembly 8 and is on the same side as the gear assembly 12.

[0043] A slide groove 21 is provided through the fixed side plate 2; the wheel seat assembly 8 includes a wheel seat 81 and a pulley 82; one end of the wheel seat 81 is arranged in a circular ring, and the pulley 82 is covered on the circular ring of the wheel seat 81.

[0044] The gear assembly 12 includes a shell, and the shell cover is arranged on the outer wall of the fixed side plate 2; an input worm 121 is installed in the shell, and the input worm 121 is transmission-connected to the worm gear 122, and the center of the worm gear 122 is fixedly connected to the first wheel shaft 88, and the first wheel shaft 88 sequentially passes through the slide groove 21 on the fixed side plate 2 and is installed and connected to the wheel seat assembly 8; the first wheel shaft 88 sequentially passes through the slide groove 21, the wheel seat 81 and the rope pulley 82 on the fixed side plate 2, and the worm gear 122 drives the rope pulley 82 to rotate through the first wheel shaft 88; the handle assembly 3 is installed in linkage with the first wheel shaft 88, and drives the wheel seat assembly 8 to slide along the slide groove 21 through the first wheel shaft 88.

[0045] Both ends of the input worm 121 extend out of the left and right side walls of the shell and are provided with an electric drill connection port 123. The electric drill connection port 123 cooperates with the rotation of the drill bit of an external electric drill, thereby driving the input worm 121 to rotate. The rotation of the input worm 121 will drive the worm gear 122 to rotate, and the rotation of the worm gear 122 will drive the pulley 82 on the first wheel shaft 88 to rotate.

[0046] Since the input worm 121 can transmit the worm gear 122 , while the worm gear 122 cannot transmit the input worm 121 in reverse, it is precisely because of this characteristic of the worm that dangerous accidents caused by reverse rotation can be effectively prevented.

[0047] Optionally, the descender also includes a second wheel axle; a third slot is provided on the inner wall of the fixed side plate 2, and the slide groove 21 is arranged in the third slot; the wheel seat 81 is arranged in the third slot, and the wheel seat 81 is rotatably connected to the fixed side plate 2 through the second wheel axle, and the wheel seat 81 is driven to slide in the third slot by the sliding of the first wheel axle 88 in the slide groove 21.

[0048] Optionally, the third card slot is configured in a water drop shape.

[0049] A ring block 84 is fixedly set on the circular ring of the wheel seat 81, and an internal gear 85 is sleeved on the outer circumference of the ring block 84; a plurality of mounting grooves are opened on the outer circumference of the ring block 84, and the mounting grooves are arranged at intervals on the outer circumference of the ring block 84; a ratchet 86 is embedded in one end of the mounting groove, and a spring 87 is embedded in the other end of the mounting groove, and the spring 87 and the ratchet 86 are arranged in abutment with each other; teeth are provided on the outer side wall of the ratchet 86 away from the spring 87; the ratchet 86 is meshed and connected with the internal gear 85.

[0050] The rope pulley 82 is covered on the outer periphery of the inner gear 85 and is installed and connected to the inner gear 85; the inner gear ring 85 cooperates with the ratchet 86 and the spring 87 assembled on the ring block 84, so that the rope pulley 82 can only rotate in one direction, preventing the rope pulley 82 from rotating suddenly.

[0051] A corresponding first wire groove is provided on the outer periphery of the rope wheel 82 for the rope to pass through.

[0052] The handle assembly 3 includes a handle 31, a connecting rod 32, a handle shaft 35 and a connecting rod shaft 38; the handle 31 is rotatably connected to the fixed side plate 2 via the handle shaft 35; the connecting rod 32 is rotatably connected to the handle 31 via the connecting rod shaft 38; the connecting rod 32 is linked to one end of the first wheel shaft 88 extending out of the outer wall of the fixed side plate 2 to drive the first wheel shaft 88 to slide back and forth in the slide groove 21.

[0053] A second slot 311 and a rotation slot are respectively formed on one side of the handle 31 facing the fixed side plate 2 ; the rotation slot is connected to the second slot 311 ; one end of the connecting rod 32 is rotatably embedded in the rotation slot.

[0054] The handle assembly 3 also includes a first spring 33; the first spring 33 is embedded in the second slot 311, and both ends of the first spring 33 are arranged in contact with the inner wall of the second slot 311; the first spring 33 cooperates with the connecting rod 32 to buffer the rotation of the handle 31 and the connecting rod 32, so that the rotation of the handle is smoother and sudden rotation is avoided.

[0055] The end of the connecting rod 32 away from the rotating groove of the handle 31 is bent or folded to form a bend; a connecting column 322 is fixedly provided on the outer wall of the end of the connecting rod 32 away from the bend, and a clamping column 323 is fixedly provided on one side of the connecting column 322; one end of the first spring 33 is abutted against the inner wall of the second clamping groove 311; the other end of the first spring 33 is sleeved on the clamping column 323, abutted against the connecting column 322, and the clamping column 323 extends into the interior of the first spring 33.

[0056] Optionally, a protrusion is provided in the middle part or the adjacent area of ​​the middle part of the connecting rod 32; the protrusion and the bend are provided on the same side of the connecting rod 32, and a first groove 321 is formed between the protrusion and the bend; the first groove 321 is installed in linkage with one end of the first wheel axle 88 extending out of the outer wall of the fixed side plate 2.

[0057] A connecting groove is provided through the handle 31 from the outside to the inside; the connecting groove, the second card slot 311 and the rotation groove are arranged at the same end of the handle 31; one end of the handle shaft 35 passes through the connecting groove and is rotationally connected to the handle 31; the other end of the handle shaft 35 passes through the fixed side plate 2 and is rotationally connected to the fixed side plate 2.

[0058] The handle assembly 3 further includes a handle torsion spring 36 . The handle torsion spring 36 is sleeved on the outer periphery of the handle shaft 35 and is disposed between the handle 31 and the fixed side plate 2 .

[0059] The descender also includes a friction block 9 and a switch assembly 10; the friction block 9 is installed between the fixed side plate 2 and the movable side plate 1; the friction block 9 is provided with a second slot; the movable side plate 1 is provided with a first hole; the switch assembly 10 passes through the first hole and the second slot in sequence and is slidably embedded in the second slot.

[0060] The switch assembly 10 includes a button 101, a receiving seat 102, a cross bar 104 and a second spring 105; the receiving seat 102 is slidably embedded in the second slot; a first through hole is provided at the top of the receiving seat 102, and a third through hole is provided at the bottom of the receiving seat 102; two second through holes 1021 are respectively provided on both sides of the receiving seat 102, and the two second through holes 1021 are arranged opposite to each other; the two ends of the cross bar 104 respectively pass through the corresponding second through holes 1021 and are mounted in the first through hole; a third groove 1011 is provided at the lower end of the button 101; the lower end of the button 101 is embedded in the first through hole, and the third groove 1011 is slidably covered on the outer periphery of the cross bar 104; the second spring 105 is embedded in the third through hole, and the other end of the second spring 105 is abutted against the bottom of the second slot.

[0061] The switch assembly 10 also includes a limit member 103; a second limit groove 1022 is opened on the outer side wall of the receiving seat 102; one end of the limit member 103 is slidably embedded in the second limit groove 1022, and the other end of the limit member 103 sequentially passes through the side wall of the second slot and is installed and connected to the friction block 9.

[0062] The descender also includes a hanging hole fixing block 11, which is arranged between the fixed side plate 2 and the movable side plate 1; the friction block 9 and the hanging hole fixing block 11 are respectively fixed on the side walls of the fixed side plate 2 on both sides of the wheel seat assembly 8; corresponding wire grooves are opened on the outside of the friction block 9 and the hanging hole fixing block 11 for the rope to pass through.

[0063] Preferably, the wire grooves of the friction block 9 and the hanging hole fixing block 11 are arranged opposite to each other.

[0064] The descender also includes a movable friction block 5; the movable friction block 5 is rotatably connected to the fixed side plate 2; the movable friction block 5 includes a main body and a blocking block; one end of the main body is installed and connected to the fixed side plate 2; the other end of the main body is fixedly connected to the blocking block, and the blocking block is mounted on the outer side of the friction block 9 through the main body.

[0065] The above is only a preferred specific implementation method of the present application; however, the protection scope of the present application is not limited thereto; any technician familiar with the technical field within the technical scope disclosed in the present application, who makes equivalent replacements or changes based on the technical solution and improved ideas of the present application, shall be covered within the protection scope of the present application.

Claims

1. A descender with a worm, characterized in that: The invention comprises a fixed side plate (2), a movable side plate (1), a rotating sleeve (6), a wheel seat assembly (8), a handle assembly (3) and a gear assembly (12); the movable side plate (1) is rotatably connected to the fixed side plate (2) via the rotating sleeve (6); the wheel seat assembly (8) is installed between the fixed side plate (2) and the movable side plate (1); the gear assembly (12) is installed on a side of the fixed side plate (2) away from the wheel seat assembly (8) and is installed in linkage with the wheel seat assembly (8); A slide groove (21) is provided on the fixed side plate (2); the gear assembly (12) includes a housing, an input worm (121) is installed in the housing, the input worm (121) is connected to the worm gear (122), the center of the worm gear (122) is fixedly connected to the first wheel shaft (88), the first wheel shaft (88) sequentially passes through the slide groove (21) on the fixed side plate (2), and is installed and connected to the wheel seat assembly (8); the handle assembly (3) is installed in conjunction with the first wheel shaft (88), and drives the wheel seat assembly (8) to slide along the slide groove (21) through the first wheel shaft (88).

2. A descender with a worm according to claim 1, characterized in that: The wheel seat assembly (8) includes a wheel seat (81) and a rope pulley (82); one end of the wheel seat (81) is arranged in a circular ring, and the rope pulley (82) is covered on the circular ring of the wheel seat (81); the first wheel shaft (88) sequentially passes through the slide groove (21) on the fixed side plate (2), the wheel seat (81) and the rope pulley (82); the worm gear (122) drives the rope pulley (82) to rotate through the first wheel shaft (88).

3. A descender with a worm according to claim 2, characterized in that: A ring block (84) is fixedly provided on the circular ring of the wheel seat (81), and an inner gear (85) is sleeved on the outer periphery of the ring block (84); a plurality of mounting grooves are provided on the outer periphery of the ring block (84), and the mounting grooves are spaced apart and arranged on the outer periphery of the ring block (84); a ratchet (86) is embedded in one end of the mounting groove, and a spring (87) is embedded in the other end of the mounting groove, and the spring (87) and the ratchet (86) are arranged in contact with each other; teeth are provided on the outer side wall of the ratchet (86) away from the spring (87); the ratchet (86) is meshed and connected with the inner gear (85); The rope pulley (82) cover is arranged on the outer periphery of the internal gear (85) and is installed and connected with the internal gear (85).

4. A descender with a worm according to claim 1, characterized in that: The handle assembly (3) includes a handle (31), a connecting rod (32), a handle shaft (35) and a connecting rod shaft (38); the handle (31) is rotatably connected to the fixed side plate (2) via the handle shaft (35); the connecting rod (32) is rotatably connected to the handle (31) via the connecting rod shaft (38); the connecting rod (32) is linked to an end of the first wheel shaft (88) extending out of the outer wall of the fixed side plate (2) to drive the first wheel shaft (88) to slide back and forth in the slide groove (21).

5. A descender with a worm according to claim 4, characterized in that: A second clamping groove (311) and a rotation groove are respectively provided on one side of the handle (31) facing the fixed side plate (2); the rotation groove and the second clamping groove (311) are connected through and arranged; one end of the connecting rod (32) is rotatably embedded in the rotation groove; The handle assembly (3) further comprises a first spring (33); the first spring (33) is embedded in the second slot (311), and both ends of the first spring (33) are arranged in contact with the inner side wall of the second slot (311); one end of the connecting rod (32) away from the rotating slot of the handle (31) is bent or folded to form a bend; a connecting column (322) is fixedly provided on the outer side wall of the end of the connecting rod (32) away from the bend, and a clamping column (323) is fixedly provided on one side of the connecting column (322); one end of the first spring (33) is arranged in contact with the inner side wall of the second slot (311); the other end of the first spring (33) is sleeved on the clamping column (323) and is arranged in contact with the connecting column (322), and the clamping column (323) extends into the interior of the first spring (33).

6. A descender with a worm according to claim 5, characterized in that: A protrusion is provided in the middle portion of the connecting rod (32) or in an area adjacent to the middle portion; the protrusion and the bend are provided on the same side of the connecting rod (32), and a first groove (321) is formed between the protrusion and the bend; the first groove (321) is mounted in linkage with an end of the first wheel shaft (88) extending out of the outer side wall of the fixed side plate (2); The handle (31) is provided with a connecting groove extending from the outside to the inside; the connecting groove, the second clamping groove (311) and the rotating groove are provided at the same end of the handle (31); one end of the handle rotating shaft (35) passes through the connecting groove and is rotatably connected to the handle (31); the other end of the handle rotating shaft (35) passes through the fixed side plate (2) and is rotatably connected to the fixed side plate (2); The handle assembly (3) further includes a handle torsion spring (36), which is sleeved on the outer periphery of the handle shaft (35) and is arranged between the handle (31) and the fixed side plate (2).

7. The descender with a worm according to claim 1, characterized in that: It also includes a friction block (9) and a switch assembly (10); the friction block (9) is installed between the fixed side plate (2) and the movable side plate (1); the friction block (9) is provided with a second slot; the movable side plate (1) is provided with a first jack; the switch assembly (10) sequentially passes through the first jack and the second slot and is slidably embedded in the second slot.

8. A descender with a worm according to claim 7, characterized in that: The switch assembly (10) comprises a button (101), a receiving seat (102), a cross bar (104) and a second spring (105); the receiving seat (102) is slidably embedded in the second slot; a first through hole is provided on the top of the receiving seat (102), and a third through hole is provided on the bottom of the receiving seat (102); two second through holes (1021) are respectively provided on both sides of the receiving seat (102), and the two second through holes (1021) are arranged opposite to each other; two ends of the cross bar (104) respectively pass through the corresponding second through holes (1021) and are mounted in the first through hole; a third groove (1011) is provided at the lower end of the button (101); the lower end of the button (101) is embedded in the first through hole, and the third groove (1011) is slidably covered on the outer periphery of the cross bar (104); the second spring (105) is embedded in the third through hole, and the other end of the second spring (105) is arranged to abut against the bottom of the second slot; The switch assembly (10) further includes a limiting member (103); a second limiting groove (1022) is provided on the outer peripheral side wall of the receiving seat (102); one end of the limiting member (103) is slidably embedded in the second limiting groove (1022), and the other end of the limiting member (103) sequentially passes through the side wall of the second slot and is installed and connected to the friction block (9).

9. The descender with a worm according to claim 7, characterized in that: The invention also includes a hanging hole fixing block (11), which is arranged between the fixed side plate (2) and the movable side plate (1); the friction block (9) and the hanging hole fixing block (11) are respectively fixed on the side walls of the fixed side plate (2) on both sides of the wheel seat assembly (8); and the outer sides of the friction block (9) and the hanging hole fixing block (11) are provided with corresponding wire grooves for the rope to pass through; The wire grooves of the friction block (9) and the hanging hole fixing block (11) are arranged relative to each other.

10. The descender with a worm according to claim 7, characterized in that: The movable friction block (5) is also included; the movable friction block (5) is rotatably connected to the fixed side plate (2); the movable friction block (5) includes a body and a blocking block; one end of the body is mounted and connected to the fixed side plate (2); the other end of the body is fixedly connected to the blocking block, and the blocking block is mounted on the outer side of the friction block (9) through the body.

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