Search

CN-121986665-A - Tree trimming device based on ratchet is adjustable

CN121986665ACN 121986665 ACN121986665 ACN 121986665ACN-121986665-A

Abstract

The invention discloses a tree pruning device based on an adjustable ratchet wheel, and relates to the technical field of forestry maintenance tools. Aiming at the problems that the traditional stay cord type high branch scissors need larger instantaneous pulling force when shearing thicker branches, displacement is difficult to maintain due to easy rebound in the shearing process, quick unlocking and resetting are difficult to realize after a ratchet wheel labor-saving structure is locked, and the like, the device is provided with a shearing head at one end of a main body, the shearing head comprises a movable cutter and a fixed cutter, a handle is arranged at the other end of the main body, a cutting stay cord and an unlocking stay cord are respectively connected at the handle, the cutting stay cord is pulled by a line collecting wheel to close the movable cutter so as to realize shearing, and a pawl and a ratchet wheel are meshed to lock the retreating direction so as to realize sectional accumulated propulsion; when the unlocking pull rope is required to reset, the limited connecting block is driven to move and compress the reset spring, so that the ratchet wheel is displaced relative to the pawl to be disengaged from the engagement to release the locking, the reset spring pushes the ratchet wheel to reset and re-engage with the connecting block after the ratchet wheel is released, and the movable knife is opened under the action of the rotating shaft spring.

Inventors

  • ZHANG YINGFANG

Assignees

  • 聊城江北水城旅游度假区李海务街道办事处

Dates

Publication Date
20260508
Application Date
20260331

Claims (6)

  1. 1. Tree pruning device based on ratchet is adjustable, including main part (1), characterized by: one end of the main body (1) is fixedly connected with a shearing head (5), and the shearing head (5) comprises a fixed cutter (52) and a movable cutter (51) which is rotationally connected with the fixed cutter (52) so as to form a shearing opening for clamping and shearing tree branches; the other end of the main body (1) is provided with a handle (2), a cutting pull rope (4) and an unlocking pull rope (3) are connected at the handle (2), and the cutting pull rope (4) extends along the main body (1) and is connected with the movable knife (51) after being guided by a line concentration wheel (6) at the shearing head (5) so as to drive the movable knife (51) to be closed relative to the fixed knife (52); A ratchet wheel (8) and a pawl (7) are arranged in the shearing head (5), the ratchet wheel (8) is in transmission connection with the movable knife (51) and rotates along with the movable knife (51) in the process that the cutting stay rope (4) drives the movable knife (51) to be closed, and the pawl (7) is connected with the shearing head (5) and meshed with the ratchet wheel (8) so as to lock the retraction direction of the ratchet wheel (8); Still set up connecting block (9) just connecting block (9) are in shearing head (5) receive spacing and can only follow the direction of predetermineeing and remove, unblock stay cord (3) with connecting block (9) are connected in order to drive connecting block (9) remove, connecting block (9) with ratchet (8) are connected in order to drive when connecting block (9) remove ratchet (8) are relative pawl (7) produce the displacement thereby relieve pawl (7) to the locking of ratchet (8), connecting block (9) with set up reset spring (10) between shearing head (5) in order to promote after unblock stay cord (3) connecting block (9) with ratchet (8) reset and make ratchet (8) again with pawl (7) meshing.
  2. 2. The tree pruning device based on the ratchet wheel is adjustable, and is characterized in that the hub wheel (6) is rotatably connected with the shearing head (5) through a wheel shaft, the wheel shaft is of a screw shaft or a pin shaft structure and penetrates through two side plates of the shearing head (5) in the radial direction, a wheel hole is formed in the center of the hub wheel (6), a shaft sleeve is sleeved in the wheel hole, the diameter of the wheel hole is 4-8 mm, and limiting gaskets are respectively arranged at two ends of the wheel shaft to limit the hub wheel (6) from moving in the axial direction.
  3. 3. The tree pruning device based on the ratchet wheel is adjustable, and is characterized in that the cutting stay rope (4) and the unlocking stay rope (3) are arranged in a penetrating way along the inside of the main body (1) in a penetrating way, the main body (1) is provided with guide sleeves at the end close to the handle (2) and the end close to the shearing head (5) respectively, the guide sleeves are of metal or engineering plastic lining structures, the aperture of a through hole of each guide sleeve is 3-6 mm, and the axis of the through hole is coaxial with the penetrating way.
  4. 4. The tree pruning device based on the adjustable ratchet wheel of claim 1, wherein the ratchet wheel (8) is coaxially sleeved on a ratchet wheel shaft and fixedly connected with the ratchet wheel shaft, the ratchet wheel shaft is coaxially arranged with a rotating shaft of the movable knife (51) or is fixedly connected with the rotating shaft through a connecting sleeve, the connecting sleeve is of a structure with a flat hole or a key slot hole, and the flat width of the ratchet wheel shaft is 3 mm-6 mm and is in transition fit with the flat hole.
  5. 5. The tree pruning device based on the ratchet wheel is adjustable according to claim 1, wherein the pawl (7) is hinged with the shearing head (5) through a hinge pin, a pawl pin hole is formed in the pawl (7), the aperture of the pawl pin hole is 3 mm-5 mm, and clamp spring grooves are formed in two ends of the hinge pin and are used for axially limiting by assembling clamp springs.
  6. 6. The tree pruning device based on the ratchet wheel is characterized in that the reset spring (10) is at least four compression springs which are arranged in parallel, spring seats are respectively arranged on the connecting block (9) and the inner wall of the shearing head (5), spring positioning holes are formed in the spring seats, the hole diameters of the spring positioning holes are 6 mm-12 mm, the hole depths of the spring positioning holes are 5 mm-15 mm, and two ends of each compression spring are respectively inserted into the corresponding spring positioning holes.

Description

Tree trimming device based on ratchet is adjustable Technical Field The invention relates to the technical field of forestry maintenance tools, in particular to a tree pruning device based on an adjustable ratchet wheel. Background The tree pruning is a common operation in landscaping, fruit tree cultivation and municipal maintenance, in the prior art, the pruning of branches is usually completed by adopting tools such as handheld pruning shears, long-handle shears, high-branch shears and the like, and for higher positions or thicker branches, the common mode is that a shearing head is conveyed to an operation position through a telescopic rod, and then an operator pulls and drives the shearing head to be closed through a stay cord at the ground end, so that the long-distance shearing operation is realized. The existing stay cord type high branch shears mostly adopt a force transmission mode of directly closing the shearing head by single pulling, an operator needs to continuously apply force in a longer stay cord stroke to obtain enough shearing force, the situation that the stay cord is not moved, the stay cord rebounds or the shearing is not in place easily occurs when the operator encounters harder or thicker branches, meanwhile, the shearing head is easy to rebound and reset when the operator loosens hands or the moment is insufficient due to the fact that the reliable limiting of the backspacing direction is lacking in the shearing process, so that the generated shearing displacement is difficult to maintain, repeated alignment and repeated application of force are caused, the operation efficiency is reduced, and the labor intensity is increased. Disclosure of Invention The invention mainly aims to provide a tree pruning device based on an adjustable ratchet wheel, which can effectively solve the problems in the background technology. One end of the main body is fixedly connected with a shearing head, and the shearing head comprises a fixed knife and a movable knife which is rotationally connected with the fixed knife so as to form a shearing opening for clamping and shearing tree branches; the other end of the main body is provided with a handle, the handle is connected with a cutting pull rope and an unlocking pull rope, and the cutting pull rope extends along the main body and is connected with the movable knife after being guided by a line concentration wheel at the shearing head so as to drive the movable knife to be closed relative to the fixed knife; A ratchet wheel and a pawl are arranged in the shearing head, the ratchet wheel is in transmission connection with the movable knife and rotates along with the movable knife in the process that the cutting stay cord drives the movable knife to be closed, and the pawl is connected with the shearing head and meshed with the ratchet wheel to lock the retraction direction of the ratchet wheel; Still set up the connecting block in the shearing head just the connecting block is in limited and can only follow the direction of predetermineeing in the shearing head, the unblock stay cord with the connecting block is connected in order to drive the connecting block removes, the connecting block with the ratchet is connected in order to drive when the connecting block removes the ratchet is relative the pawl produces the displacement thereby to relieve the pawl is to the locking of ratchet, the connecting block with set up reset spring between the shearing head in order to promote after the unblock stay cord loosens connecting block with the ratchet resets and makes the ratchet again with the pawl meshing. Further, the hub is rotationally connected with the shear head through a wheel shaft, the wheel shaft is of a screw shaft or pin shaft structure and penetrates through two side plates of the shear head in the radial direction, a wheel hole is formed in the center of the hub, a shaft sleeve is sleeved in the wheel hole, the aperture of the wheel hole is 4-8 mm, and limiting gaskets are respectively arranged at two ends of the wheel shaft to limit the hub to axially move. Further, the cutting stay cord with the unblock stay cord is followed the inside rope passageway of threading of main part is worn to establish, the main part is being close to the handle end and is close to the shear head end and sets up the uide bushing respectively, the uide bushing is metal or engineering plastics bush structure, the through-hole aperture of uide bushing is 3mm ~6mm and the through-hole axis with the rope passageway is coaxial. Further, the ratchet wheel is coaxially sleeved on the ratchet wheel shaft and fixedly connected with the ratchet wheel shaft, the ratchet wheel shaft and the rotating shaft of the movable knife are coaxially arranged or are fixedly connected through a connecting sleeve, the connecting sleeve is of a structure with a flat hole or a key slot hole, and the flat width of the ratchet wheel shaft is 3 mm-6 mm and is in transition fit with the flat hole