CN112753526A

CN112753526A - Felling saw device for forestry

Info

Publication number: CN112753526A
Application number: CN202110071680.6A
Authority: CN
Inventors: 苗君涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-05-07
Anticipated expiration: 2041-01-19
Also published as: CN112753526B

Abstract

The invention relates to the technical field of forestry instruments, and discloses a felling saw device for forestry, which comprises a felling saw body, wherein a steering mechanism is sleeved on the outer side wall of the felling saw body, the steering mechanism is hinged with a limiting mechanism, the bottom of the limiting mechanism is fixedly connected with an adjusting mechanism, a clamping mechanism is arranged at the bottom of the adjusting mechanism, and a protection mechanism is arranged on one side of the top of the steering mechanism. According to the tree pruning machine, the steering mechanism is designed, the transmission seat at the bottom of the felling saw body is rotated to drive the clamping ring to rotate in the fixing seat, the deflection angle of the felling saw body can be adjusted, and after the position of the felling saw body is adjusted, the tree pruning machine can be used for cutting and pruning branches through deflection of the felling saw body, the adaptive capacity to the fixed angle can be obviously improved, meanwhile, the placing stability during cutting can be ensured, the cutter head is prevented from being damaged due to deflection resonance, and the use safety is ensured.

Description

Felling saw device for forestry

Technical Field

The invention relates to the technical field of forestry instruments, in particular to a felling saw device for forestry.

Background

Forestry is when planting the maintenance, generally need prune the trees branch, avoids influencing the growth of trees, generally need use the lumbering saw during pruning, guarantees to prune the effect.

Chinese patent document CN104705158B discloses a felling saw device for forestry, the inventor finds that certain defects still exist when the prior art is realized, 1, when a stump is inserted, the operation on the stump root is greatly damaged, the pruning requirement cannot be met, only the felling can be carried out, and the felling saw device is not beneficial to ecological environment cultivation; 2. the direction adjusting capability is poor, the multi-axis adjusting capability is lacked, and the cutting terrain cannot be adapted; 3. when the branches are trimmed, more scraps can be generated, the scraps splash to influence the working environment nearby and the normal work of workers.

Disclosure of Invention

Aiming at the problems that in the prior art 1, the operation on the rootstocks of the stumps is greatly damaged when the stumps are inserted, the pruning requirements cannot be met, only the stumps can be cut, and the ecological environment is not favorable for cultivation; 2. the direction adjusting capability is poor, the multi-axis adjusting capability is lacked, and the cutting terrain cannot be adapted; 3. when the branch was pruned, can produce more sweeps, the sweeps splashes and can influence near operational environment, influences the problem that the staff normal worker exists, provides a felling saw device for forestry.

In order to solve the technical problem, the invention is solved by the following technical scheme:

the utility model provides a felling saw device for forestry, includes the felling saw body, felling saw body lateral wall cover is equipped with steering mechanism, steering mechanism articulates there is stop gear, stop gear bottom fixedly connected with adjustment mechanism, the adjustment mechanism bottom is equipped with fixture, steering mechanism top one side is equipped with protection machanism.

As preferred, steering mechanism includes the fixing base, sliding connection has the snap ring in the recess of seting up in the fixing base, and snap ring fixed connection is at lumbering saw body outer wall, a plurality of card holes have been seted up around the snap ring outer wall, and fixing base inner chamber recess one side inlays and is equipped with first sliding sleeve, sliding connection has first slide bar in the first sliding sleeve, first slide bar top fixedly connected with first in command, first slide bar lateral wall cover is equipped with first spring, first spring both ends respectively with first sliding sleeve and first slide bar one side fixed connection, fixing base one side is articulated mutually with stop gear through the round pin axle.

As preferred, stop gear is including articulated seat and fixed block, fixed block fixed connection is in fixing base one side bottom, articulated seat is articulated with round pin axle and stop gear, the thread groove has been seted up to articulated seat one side, and fixed block one side inlays and is equipped with first screw thread post, first screw thread post threaded connection is in the thread groove, articulated seat bottom and adjustment mechanism top fixed connection.

Preferably, the thread groove is annular, and the inner cavity of the thread groove is a conical surface.

As preferred, adjustment mechanism is including adjusting the seat, both sides all inlay and are equipped with first bearing in adjusting the seat, first bearing endotheca is equipped with first pivot, and fixedly connected with second screw thread post between the first pivot of both sides, second screw thread post lateral wall threaded connection has second screw thread cap, second screw thread cap lateral wall inlays and is equipped with the slider, slider top and articulated seat bottom fixed connection, and first pivot one end fixedly connected with second handle, adjust seat bottom and fixture top fixed connection.

Preferably, the clamping mechanism comprises a clamping seat, a rubber pad is fixedly connected to the inner cavity of the clamping seat, the cross section of the clamping seat is U-shaped, connecting blocks are fixedly connected to two sides of the bottom of the clamping seat, threaded holes are formed in the connecting blocks on two sides, and threaded rods are connected between the connecting blocks on the two sides in a threaded mode.

As preferred, protection machanism includes the guard plate, guard plate fixed connection is in fixing base one side, guard plate one side fixedly connected with connecting seat, connecting seat inner chamber fixedly connected with second sliding sleeve, sliding connection has the second slide bar in the second sliding sleeve, the second slide bar removes fixedly connected with slide, slide sliding connection is at the connecting seat inner chamber, second slide bar other end fixedly connected with baffle, the baffle is laminated mutually with connecting seat one side, second slide bar lateral wall cover is equipped with the second spring, the second spring both ends correspond position fixed connection with second sliding sleeve and baffle one side respectively.

Preferably, the inner cavity of the baffle plate is provided with an arc-shaped groove.

Preferably, the baffle top fixedly connected with supporting shoe, connecting seat top fixedly connected with third screw cap, third screw cap female connection has the third screw thread post, third screw thread post one side fixedly connected with third pivot, third pivot lateral wall cover is equipped with the third bearing, the third bearing inlays to be established in the corresponding position of supporting shoe one side, third screw thread post one end fixedly connected with third handle.

Preferably, the diameter of the inner cavity of the clamping hole is equal to that of the first sliding rod, and the first sliding rod and the clamping hole are in tight fit.

Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:

1. according to the tree felling saw, the bottom clamping seat is adjusted on the outer wall of the tree trunk through the designed steering mechanism, the tree felling saw is fixed by screwing the fixing screw rods into the connecting blocks on the two sides, the first handle is pulled to drive the first sliding rod to move out of the clamping hole, the transmission seat at the bottom of the felling saw body is rotated to drive the clamping ring to rotate in the fixing seat, the deflection angle of the felling saw body can be adjusted, and after the position of the felling saw body is adjusted, the tree felling saw can be suitable for cutting and trimming branches through deflection of the felling saw body, the adaptability to the fixed angle can be obviously improved, meanwhile, the placing stability during cutting can be guaranteed, the cutter head is prevented from being damaged due to.

2. According to the invention, through the designed adjusting mechanism, after the offset angle of the felling tool body is adjusted, the first threaded column is screwed to be separated from the threaded groove, at the moment, the felling tool body on one side and the protection mechanism can be driven to synchronously rotate and offset axially through the rotation of the fixed seat around the pin shaft, the deflection of the fixed seat can be further adapted to the deflection and direction adjustment of the felling saw body, when the felling saw body works, the first rotating shaft on one side can be screwed to drive the second threaded column to rotate, the second threaded cap and the sliding block which are in threaded connection move to pull the top hinge seat to drive the fixed seat to move towards one side, and then the felling saw body can be driven to transversely move after the hinge position changes, so that the cutting and trimming capacity of the trunk and branches can be obviously improved through multi-axis.

3. According to the protection mechanism, when the felling saw body is in contact cutting with branches, sawdust generated by the contact of the felling saw body and the branches is driven to splash outwards by the felling saw body, the side baffle and the protection plate can prevent the sawdust from splashing by limiting the sawdust, when the baffle moves, the second slide rod can be pulled to move in the second sliding sleeve, the second slide rod can extrude the second spring on one side, so that a part of impact can be absorbed by the movement of the second slide rod, the third threaded column on the top is screwed, the third threaded column rotates to drive the third rotating shaft to rotate in the third bearing, the third threaded column rotates in the third threaded cap to move, at the moment, the baffle can adjust the relative position with the side connecting seat, so that the felling saw body length assembly requirements of different lengths can be adapted, and the overall protection capability is met.

Drawings

Fig. 1 is a schematic front sectional view of the present invention.

Fig. 2 is an enlarged schematic view of part a of the present invention.

Fig. 3 is an enlarged schematic view of part B of the present invention.

Fig. 4 is a side view of the adjusting mechanism of the present invention.

Fig. 5 is an enlarged schematic view of part C of the present invention.

Fig. 6 is a schematic perspective view of a snap ring according to the present invention.

Fig. 7 is a schematic perspective view of the holder of the present invention.

The names of the parts indicated by the numerical references in the drawings are as follows: 1. a felling saw body; 2. a steering mechanism; 201. a fixed seat; 202. a pin shaft; 203. a groove; 204. a snap ring; 205. a clamping hole; 206. a first slide bar; 207. a first sliding sleeve; 208. a first handle; 209. a first spring; 3. a limiting mechanism; 301. a hinged seat; 302. a thread groove; 303. a fixed block; 304. a first threaded post; 4. an adjustment mechanism; 401. an adjusting seat; 402. a slider; 403. a second threaded cap; 404. a second threaded post; 405. a first rotating shaft; 406. a first bearing; 5. a protection mechanism; 501. a protection plate; 502. a baffle plate; 503. an arc-shaped slot; 504. a connecting seat; 505. a second slide bar; 506. a second spring; 507. a second sliding sleeve; 508. a slide plate; 509. a third threaded cap; 510. a support block; 511. a third rotating shaft; 512. a third bearing; 513. a third threaded post; 6. a clamping mechanism; 601. a holder; 602. a rubber pad; 603. and (4) connecting the blocks.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The utility model provides a felling saw device for forestry, as shown in fig. 1-7, including felling saw

body

1, 1 lateral wall cover of felling saw body is equipped with steering mechanism 2, steering mechanism 2 articulates there is stop gear 3, stop gear 3 bottom fixedly connected with adjustment mechanism 4, adjustment mechanism 4 bottom is equipped with

fixture

6, 2 top one side of steering mechanism are equipped with protection machanism 5.

Steering mechanism 2 includes fixing base 201, sliding connection has snap ring 204 in the recess 203 that sets up in the fixing base 201, and snap ring 204 fixed connection is at 1 outer wall of lumbering saw body, snap ring 204 outer wall encircles and has seted up a plurality of card holes 205, and just fixing base 201 inner chamber recess 203 one side inlays and is equipped with first sliding sleeve 207, sliding connection has first slide bar 206 in first sliding sleeve 207, the first in command 208 of first slide bar 206 top fixedly connected with, first slide bar 206 lateral wall cover is equipped with first spring 209, first spring 209 both ends respectively with first sliding sleeve 207 and first slide bar 206 one side fixed connection, fixing base 201 one side is articulated mutually with stop gear 3 through round pin axle 202.

Fixture 6 includes holder 601, holder 601 inner chamber fixedly connected with cushion 602, the shape of cross section of holder 601 is the U-shaped, and the equal fixedly connected with connecting block 603 in holder 601 bottom both sides, and all set up screw hole and threaded connection have the screw rod between the connecting block 603 of both sides, the diameter of card hole 205 inner chamber equals with the diameter of first slide bar 206, and first slide bar 206 and card hole 205 are closely matched.

The implementation mode is specifically as follows: when trees need to be pruned or felled, the bottom clamping seat 601 is adjusted on the outer wall of a trunk, and is fixed by screwing the fixing screw rods into the connecting blocks 603 on the two sides, at the moment, the clamping seat 601 can adjust the top adjusting mechanism 4 and the limiting mechanism 3, the felling saw body 1 and one side of the tree body are in a vertical position, at the moment, the first sliding rod 206 is driven to slide in the first sliding sleeve 207 by pulling the first handle 208, the first sliding rod 206 can move out of the clamping hole 205, at the moment, the clamping ring 204 can be driven to rotate in the fixing seat 201 by rotating the transmission seat at the bottom of the felling saw body 1, the clamping ring 204 can rotate more stably in the fixing seat 201, the fixing seat 201 can be prevented from deviating, the deflection angle of the felling saw body 1 can be adjusted, after the position of the felling saw body 1 is adjusted, the first spring 209 can pull the first sliding rod 206 to reset to be clamped into the clamping, can avoid felling saw body 1 to take place to deflect this moment to can adapt to the cutting pruning work of branch through the deflection of felling saw body 1 self, and can show and improve the adaptation ability to fixed angle, stability of placing when can guaranteeing to cut simultaneously avoids taking place skew resonance to damage the tool bit, guarantees the safety in utilization.

The limiting mechanism 3 comprises a hinged seat 301 and a fixed block 303, the fixed block 303 is fixedly connected to the bottom of one side of the fixed seat 201, the hinged seat 301 is hinged to the pin shaft 202 and the limiting mechanism 3, a thread groove 302 is formed in one side of the hinged seat 301, a first thread column 304 is embedded in one side of the fixed block 303, the first thread column 304 is in threaded connection with the thread groove 302, the bottom of the hinged seat 301 is fixedly connected with the top of the adjusting mechanism 4, the thread groove 302 is annular, an inner cavity of the thread groove 302 is a conical surface, the adjusting mechanism 4 comprises an adjusting seat 401, first bearings 406 are embedded in two sides of the adjusting seat 401, first rotating shafts 405 are sleeved in the first bearings 406, second thread columns 404 are fixedly connected between the first rotating shafts 405 on two sides, second thread columns 404 are in threaded connection with second thread caps 403 on outer side walls, sliding blocks 402 are embedded in outer side walls of the second thread caps 403, slider 402 top and articulated seat 301 bottom fixed connection, and first pivot 405 one end fixedly connected with second handle, adjust seat 401 bottom and fixture 6 top fixed connection.

The implementation mode is specifically as follows: after the deflection angle of the felling tool body is adjusted, the first threaded column 304 is screwed to rotate in the fixed block 303 and the first threaded cap, the first threaded column 304 can be separated from the threaded groove 302 in a rotating mode, at the moment, the fixed seat 201 can rotate around the pin shaft 202, the fixed seat 201 can be rotated to drive the felling tool body on one side and the protection mechanism 5 to synchronously and axially rotate and deflect, after the angle is adjusted, the first threaded column 304 can be reversely screwed to reset and clamp into the threaded groove 302, the tapered threaded groove 302 can be clamped and fixed after the first threaded column 304 is screwed in and reset, the clamping and fixing stability is guaranteed, the deflection direction adjustment of the felling saw body 1 can be further adapted through the deflection of the fixed seat 201, when a circuit is opened, the felling saw body 1 can rotate through screwing the first rotating shaft 405 on one side, the first rotating shaft 405 can drive the second threaded column 404 to rotate, second screw post 404 rotates second screw cap 403 and the slider 402 removal that can drive threaded connection, and slider 402 removes and can stimulate articulated seat 301 in top to drive fixing base 201 and remove to one side, and then can drive lumbering saw body 1 and carry out lateral shifting after the articulated position changes to can show the cutting pruning ability that improves the trunk branch through the multiaxis regulation, satisfy the cutting and use needs.

The protection mechanism 5 comprises a protection plate 501, the protection plate 501 is fixedly connected to one side of a fixed seat 201, one side of the protection plate 501 is fixedly connected with a connecting seat 504, an inner cavity of the connecting seat 504 is fixedly connected with a second sliding sleeve 507, a second sliding rod 505 is slidably connected in the second sliding sleeve 507, a sliding plate 508 is movably and fixedly connected to the second sliding rod 505, the sliding plate 508 is slidably connected to an inner cavity of the connecting seat 504, the other end of the second sliding rod 505 is fixedly connected with a baffle 502, the baffle 502 is attached to one side of the connecting seat 504, a second spring 506 is sleeved on the outer side wall of the second sliding rod 505, two ends of the second spring 506 are respectively fixedly connected with the second sliding sleeve 507 and one side of the baffle 502 in corresponding positions, an arc-shaped groove 503 is formed in the inner cavity of the baffle 502, a supporting, third screw cap 509 female connection has third screw post 513, third screw post 513 one side fixedly connected with third pivot 511, third pivot 511 lateral wall cover is equipped with third bearing 512, third bearing 512 inlays and establishes at the corresponding position in supporting shoe 510 one side, third screw post 513 one end fixedly connected with third handle.

The implementation mode is specifically as follows: when the felling saw body 1 is contacted with branches for cutting, sawdust generated by the contact of the felling saw body 1 and the branches is driven to splash outwards through the felling saw body 1, at the moment, a side baffle 502 and a protection plate 501 can prevent the sawdust from splashing through limiting the sawdust, meanwhile, the baffle 502 can adapt to an energy absorption effect through a side arc-shaped groove 503, when the baffle 502 moves, a second slide rod 505 can be pulled to move in a second sliding sleeve 507, the second slide rod 505 moves to press a side second spring 506, the second spring 506 can improve the support of the second sliding sleeve 507 by utilizing the elasticity of the second spring, further deflection can be avoided, so that a part of impact can be absorbed through the movement of the second slide rod 505, and by screwing a top third threaded column 513, the third threaded column 513 rotates to drive a third rotating shaft 511 to rotate in a third bearing 512, and the third threaded column 513 rotates in a third threaded cap 509 to move, the relative position of baffle 502 can be adjusted with one side connecting seat 504 this moment to can the different length of adaptation lumbering saw body 1 length assembly needs, satisfy whole protective capacities.

The working principle is as follows: adjust at the trunk outer wall through with bottom holder 601, and fix through the wrong income clamping screw in both sides connecting block 603, holder 601 can adjust top adjustment mechanism 4 and stop gear 3 this moment, felling saw body 1 is in vertical position with trees body one side, drive first slide bar 206 and slide in first sliding sleeve 207 through pulling first in command 208 this moment, first slide bar 206 removes and can shift out card hole 205, can drive snap ring 204 at fixing base 201 internal rotation through rotating felling saw body 1 bottom transmission seat this moment, adjust the deflection angle of felling saw body 1, through loosening first in command 208, first spring 209 can utilize self pulling force pulling first slide bar 206 to reset and block into in the card hole 205.

After the offset angle of the felling tool body is adjusted, the first threaded column 304 is screwed to rotate in the fixed block 303 and the first threaded cap, the first threaded column 304 can be separated from the threaded groove 302 in rotation, at the moment, the fixed block 201 can rotate around the pin shaft 202, the fixed block 201 can be rotated to drive the felling machine body and the protection mechanism 5 on one side to carry out synchronous axial rotation offset, after the angle is adjusted, the first threaded column 304 can be reset and clamped into the threaded groove 302 in a reverse screwing mode, the conical threaded groove 302 can be clamped and fixed after the first threaded column 304 is screwed in and reset, when the felling saw body 1 works, the first rotating shaft 405 on one side can be screwed to rotate, the first rotating shaft 405 can drive the second threaded column 404 to rotate, the second threaded column 404 can be rotated to drive the second threaded cap 403 and the sliding block 402 which are in threaded connection to move, the sliding block 402 can drive the top hinged base 301 to drive the fixed block 201 to move towards one, and then can drive felling saw body 1 and carry out the lateral shifting cutting after the articulated position changes.

When felling saw body 1 and branch contact cutting, the saw-dust that felling saw body 1 and branch contact produced drives through felling saw body 1 and outwards splashes, at this moment, a side shield 502 and guard plate 501 can avoid its splash through the spacing to the saw-dust, can stimulate second slide bar 505 to remove in second sliding sleeve 507 when baffle 502 removes, second slide bar 505 removes and can extrude one side second spring 506, remove through second slide bar 505 and absorb partly impact, and through twisting top third screw post 513, third screw post 513 rotates and drives third pivot 511 at third bearing 512 internal rotation, third screw post 513 rotates and removes at third screw cap 509 internal rotation, baffle 502 can adjust the relative position with one side connecting seat 504 this moment, the different length's of adaptation felling saw body 1 length.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims

1. The utility model provides a felling saw device for forestry, includes felling saw body (1), its characterized in that: the outer side wall of the felling saw body (1) is sleeved with a steering mechanism (2), the steering mechanism (2) is hinged with a limiting mechanism (3), the steering mechanism (2) comprises a fixing seat (201), a snap ring (204) is connected in a groove (203) formed in the fixing seat (201) in a sliding manner, the snap ring (204) is fixedly connected to the outer wall of the felling saw body (1), a plurality of snap holes (205) are formed in the outer wall of the snap ring (204) in a surrounding manner, a first sliding sleeve (207) is embedded in one side of the groove (203) in the inner cavity of the fixing seat (201), a first sliding rod (206) is connected in the first sliding sleeve (207) in a sliding manner, a first handle (208) is fixedly connected to the top end of the first sliding rod (206), a first spring (209) is sleeved on the outer side wall of the first sliding sleeve (206), two ends of the first spring (209) are, the fixing seat (201) is hinged to a limiting mechanism (3) through a pin shaft (202) on one side, the bottom of the limiting mechanism (3) is fixedly connected with an adjusting mechanism (4), the limiting mechanism (3) comprises a hinged seat (301) and a fixed block (303), the fixed block (303) is fixedly connected to the bottom of one side of the fixing seat (201), the hinged seat (301) is hinged to the pin shaft (202) and the limiting mechanism (3), a thread groove (302) is formed in one side of the hinged seat (301), a first thread column (304) is embedded in one side of the fixed block (303), the first thread column (304) is in threaded connection with the thread groove (302), the bottom of the hinged seat (301) is fixedly connected with the top of the adjusting mechanism (4), a clamping mechanism (6) is arranged at the bottom of the adjusting mechanism (4), the adjusting mechanism (4) comprises an adjusting seat (401), first bearings (406) are embedded in two sides of the adjusting seat (401), the first bearing (406) is internally sleeved with a first rotating shaft (405), a second threaded column (404) is fixedly connected between the first rotating shafts (405) on two sides, the outer side wall of the second threaded column (404) is in threaded connection with a second threaded cap (403), the outer side wall of the second threaded cap (403) is embedded with a sliding block (402), the top of the sliding block (402) is fixedly connected with the bottom of the hinged seat (301), one end of the first rotating shaft (405) is fixedly connected with a second handle, the bottom of the adjusting seat (401) is fixedly connected with the top of the clamping mechanism (6), one side of the top of the steering mechanism (2) is provided with a protection mechanism (5), the clamping mechanism (6) comprises a clamping seat (601), the inner cavity of the clamping seat (601) is fixedly connected with a rubber mat (602), the cross section of the clamping seat (601) is U-shaped, and connecting blocks (603) are fixedly connected with two sides of the bottom of the clamping, threaded holes are formed between the connecting blocks (603) at the two sides, and the connecting blocks are in threaded connection with screws, the protection mechanism (5) comprises a protection plate (501), the protection plate (501) is fixedly connected with one side of the fixed seat (201), one side of the protection plate (501) is fixedly connected with the connecting seat (504), a second sliding sleeve (507) is fixedly connected with the inner cavity of the connecting seat (504), a second sliding rod (505) is connected in the second sliding sleeve (507) in a sliding way, the second sliding rod (505) is movably and fixedly connected with a sliding plate (508), the sliding plate (508) is connected in an inner cavity of the connecting seat (504) in a sliding way, the other end of the second sliding rod (505) is fixedly connected with a baffle (502), the baffle (502) is attached to one side of the connecting seat (504), the outer side wall of the second sliding rod (505) is sleeved with a second spring (506), and two ends of the second spring (506) are fixedly connected with corresponding positions on one sides of the second sliding sleeve (507) and the baffle (502) respectively.

2. A logging saw device for forestry as claimed in claim 1, wherein: the thread groove (302) is annular, and the inner cavity of the thread groove (302) is a conical surface.

3. A logging saw device for forestry as claimed in claim 1, wherein: an arc-shaped groove (503) is formed in the inner cavity of the baffle plate (502).

4. A logging saw device for forestry as claimed in claim 1, wherein: baffle (502) top fixedly connected with supporting shoe (510), connecting seat (504) top fixedly connected with third screw cap (509), third screw cap (509) internal thread connection has third screw thread post (513), third screw thread post (513) one side fixedly connected with third pivot (511), third pivot (511) lateral wall cover is equipped with third bearing (512), third bearing (512) inlay and establish and correspond the position in supporting shoe (510) one side, third screw thread post (513) one end fixedly connected with third handle.

5. A logging saw device for forestry as claimed in claim 1, wherein: the diameter of the inner cavity of the clamping hole (205) is equal to that of the first sliding rod (206), and the first sliding rod (206) is tightly matched with the clamping hole (205).