Safe forestry tree pruning device

By adopting the design of limit blocks and elastic slings in the forestry tree pruning device, toolless connection fixation is achieved, which solves the difficulties of loading and unloading and storage, and improves contact stress and stability through protective clamps and adjustment racks, improving the reliability and safety of the device.

CN119498129AInactive Publication Date: 2025-02-25TANCHENG GREEN JIANLINTAO GARDEN ENGINEERING CO LTD
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Patent Information

Application Number
CN202411935171.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-02-25
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing forestry tree pruning device is troublesome during assembly and disassembly, takes up a lot of space, is not convenient for transportation and storage, and is easy to slip when climbing trees, affecting the reliability and safety of work.

Method used

The limit block is used to penetrate the limit slot and is inserted into the limit sleeve. Combined with the elastic clamp plate to penetrate the positioning hole, the tool-free and bolt-free connection fixation is achieved, the loading and unloading process is simplified, and the contact stress with the tree bark is increased through protective splints and adjustment frames to avoid resonance.

Benefits of technology

It improves the loading and unloading efficiency of the device, reduces the storage space requirement, enhances the reliability and stability of the device when climbing trees, and avoids resonance problems during equipment damage and pruning.

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Abstract

The invention provides a safe forestry tree pruning device, and relates to the technical field of tree pruning equipment, the safe forestry tree pruning device comprises a support frame, the left and right sides of the support frame are provided with mounting side plates, and the two mounting side plates are symmetrically distributed; walking frames are arranged on the opposite outer sides of the two mounting side plates, limiting blocks penetrate through limiting grooves and are inserted into limiting sleeves, elastic clamping plates penetrate through first positioning holes and second positioning holes at the same time, and in the whole assembly process, tools and bolts are not needed for connection and fixation, so that the assembly efficiency is improved. The assembly and disassembly efficiency of the walking frame on the mounting side plate is further improved, the disassembled parts can be stored more conveniently, the occupied space is smaller, the equipment can be better prevented from being damaged due to collision, extrusion and the like in the storage process, and the problems that an existing forestry tree pruning device is usually connected and fixed through a large number of bolts, and the use cost is low are solved. The problems that assembling and disassembling processes are troublesome, the whole device occupies a large space, and transportation and storage are inconvenient are solved.
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Description

Technical Field

[0001] The invention relates to the technical field of tree pruning equipment, and in particular to a safe forestry tree pruning device. Background Art

[0002] Shaping and pruning trees are important links in forestry tree maintenance and management. Shaping trees is to prune the branches of trees, such as shears and saws, so that the trees grow into the desired specific shape; while pruning trees is to thin out and shorten certain organs of trees, such as branches, flowers and leaves, on the basis of shaping, so as to achieve the purpose of regulating the growth, flowering and fruiting of trees. Tree pruning runs through the entire process of tree growth. Timely pruning of trees in the growing season can not only reduce the blocking of sunlight by aging branches, but also improve air flow between trees, enhance photosynthesis of trees, and increase the yield of trees.

[0003] When in use, existing forestry tree pruning devices usually use a large number of bolts for connection and fixation. The assembly and disassembly processes are relatively cumbersome. The device as a whole occupies a large space, which is inconvenient for transportation and storage. In addition, since the surface of tree bark is relatively smooth and the contact stress applied to the bark is relatively small, the device is prone to slipping during the upward climbing process, which reduces the reliability of the work. In addition, during the process of pruning trees with a saw, the device is prone to resonate with the tree, causing the clamp to loosen and fall, affecting the stability and safety of its pruning. Summary of the invention

[0004] The disclosed embodiment relates to a safe forestry tree pruning device, wherein a limit block passes through a limit groove, and the limit block is inserted into a limit sleeve, and an elastic clamp plate passes through a first positioning hole and a second positioning hole at the same time. It can be seen that during the entire assembly process, since no tools and bolts are required for connection and fixation, the loading and unloading efficiency of the walking frame on the mounting side plate is improved. Therefore, in the non-working season or when the equipment is idle, the disassembled parts can be stored more conveniently. Compared with a complete large equipment, the space occupied is smaller, and the equipment can be better protected from damage caused by collision, extrusion, etc. during storage.

[0005] In the first aspect of the present disclosure, a safety type forestry tree pruning device is provided, which specifically includes: a support frame, on both left and right sides of the support frame, there are installation side plates, and the two installation side plates are distributed symmetrically; on the relatively outer sides of the two installation side plates, there is a walking frame; between the two installation side plates, there is an installation seat; at the bottom of the support frame, there is a fixed bottom frame; on the fixed bottom frame, there are two protective clamping plates, and the two protective clamping plates are distributed symmetrically; at the front part of the installation seat, a fixed support is fixedly installed; on the right side of the fixed support, there is a first adjustment frame; at the front part of the first adjustment frame, there is a second adjustment frame; at the top of the support frame, a fixed top seat is fixedly installed; on the fixed top seat, there are two arc-shaped saws, and the two arc-shaped saws are distributed symmetrically; On both left and right sides of the support frame, there are fixed seats, on the fixed seats, a servo motor is fixedly installed, on the rotating shaft of the servo motor, there is a rotating shaft rod, and the rotating shaft rod is rotationally connected to the fixed seat through a bearing, and at the top end of the rotating shaft rod, there is a driving bevel gear.

[0006] In at least some embodiments, at the middle position of the front side of the installation side plate, there is a connecting frame, and the connecting frame is fixedly connected to the installation seat. The installation side plate is provided with four limiting grooves, and the four limiting grooves are distributed in a rectangular array. On the relatively inner sides of the two installation side plates, there are four limiting sleeves, and the limiting sleeves correspond to the limiting grooves. On the limiting sleeves, there are first positioning holes.

[0007] In at least some embodiments, on the installation side plate, a connecting shaft is rotationally installed through a bearing. At one end of the connecting shaft, there is a driven bevel gear, and the driven bevel gear is meshed and connected to the driving bevel gear.

[0008] In at least some embodiments, on the walking frame, two belt pulleys are rotationally installed, and between the two belt pulleys, a crawler is drivingly installed. On one side of the upper belt pulley, there is a transmission shaft, and the transmission shaft is connected to the connecting shaft. On one side of the walking frame, there are four limiting blocks. On the limiting blocks, there are second positioning holes. On the second positioning holes, there are elastic clamping plates. The limiting blocks penetrate through the limiting grooves, and the limiting blocks are inserted into the limiting sleeves, and the elastic clamping plates simultaneously penetrate through the first positioning holes and the second positioning holes.

[0009] In at least some embodiments, at the top of the fixed bottom frame, there is a connecting seat, and the connecting seat is fixedly connected to the support frame. The fixed bottom frame has a "C" - shaped structure, and between the two vertical plates of the fixed bottom frame, there are two limiting round rods, and the two limiting round rods are distributed in parallel.

[0010] In at least some embodiments, at one end of the two protective clamping plates, there are adjustment plates. Between the relatively inner sides of the two adjustment plates, there are two tension springs. On the relatively outer sides of the two adjustment plates, there are limiting slide rods, and at the end of the limiting slide rods, there are adjustment knobs.

[0011] In at least some embodiments, when the protective splint is connected to the fixed base, the limiting round rod slides through the adjustment plate, the tension spring is sleeved on the limiting round rod, and the limiting sliding rod slides through the vertical plate of the fixed base.

[0012] In at least some embodiments, a cylinder is provided on the front side of the fixed bracket, a fixed sleeve is provided on the fixed bracket, and the fixed sleeve is connected to the cylinder, and a connecting block is provided at the end of the telescopic rod of the cylinder.

[0013] In at least some embodiments, a limit bracket is provided on the first adjustment frame, and the limit bracket is fixedly connected to the right walking frame, and the limit bracket is rotatably connected to the first adjustment frame through a pin shaft, a connecting sleeve is provided at the rear end of the first adjustment frame, and two limit rods are provided at the rear end of the connecting sleeve, and the two limit rods are symmetrically distributed, and a restoring spring is mounted on the limit rod.

[0014] In at least some embodiments, a walking wheel is rotatably installed at the rear of the second adjustment frame, a support block is provided at the front end of the second adjustment frame, a connecting plug plate is provided at the front end of the support block, a positioning block is provided at the front end of the connecting plug plate, the front end of the limiting plug rod is slidably inserted in the support block, and a restoring spring is supported between the connecting sleeve and the support block, and the connecting plug plate is slidably inserted in the connecting sleeve.

[0015] The present invention provides a safe forestry tree pruning device, which has the following beneficial effects: When the walking frame and the mounting side plate are assembled in the present invention, the limit block passes through the limit groove, and the limit block is inserted into the limit sleeve, and the elastic clamping plate passes through the first positioning hole and the second positioning hole at the same time. It can be seen that during the entire assembly process, since there is no need to use tools and bolts for connection and fixation, the loading and unloading efficiency of the walking frame on the mounting side plate is improved. Therefore, in the non-working season or when the equipment is idle, the disassembled parts can be stored more conveniently. Compared with complete large equipment, the space occupied is smaller, and the equipment can be better prevented from being damaged by collision, extrusion, etc. during storage.

[0016] In addition, the present invention is provided with two protective splints, which can be pulled in opposite directions by an adjusting button and a limiting slide rod, and the two protective splints can be clamped on the tree trunk by utilizing the rebound pulling effect of the tension spring, which can effectively increase the contact stress with the bark, effectively avoid the situation of slipping and being unable to climb up, and ensure the reliability of the work.

[0017] In addition, the present invention is provided with a first adjustment frame and a second adjustment frame, which can be slidably matched with the support block through the limiting plug rod and the elastic effect of the restoring spring, so as to provide buffering during the process of pruning trees with the arc saw, effectively reduce the resonance between the pruning device and the trees, make the pruning process more stable, and ensure safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0019] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] In the attached picture: Figure 1 A schematic diagram showing the overall structure of the present application; Figure 2 This application shows Figure 1 Schematic diagram of the resulting rotational perspective; Figure 3 A schematic diagram showing the support frame, mounting side plate and mounting seat of the present application is shown; Figure 4 This application shows Figure 3 The schematic diagram of the servo motor and connecting shaft being separated; Figure 5 A schematic diagram showing a partially installed side panel and a walking frame of the present application in a disassembled state; Figure 6 A schematic diagram showing the disassembled state of the fixed chassis and the protective splint of the present application is shown; Figure 7 A schematic diagram showing a fixed bracket, a first adjustment bracket and a second adjustment bracket of the present application is shown; Figure 8 A schematic diagram showing the first adjustment frame and the second adjustment frame of the present application in a separated state.

[0021] List of reference numerals: 1. Support frame; 101. Fixed seat; 102. Servo motor; 103. Rotating shaft; 104. Active bevel gear; 2. Mounting side plate; 201. Connecting frame; 202. Limiting groove; 203. Limiting sleeve; 204. First positioning hole; 205. Connecting shaft; 206. Driven bevel gear; 3. Traveling frame; 301. Pulley; 302. Track; 303. Transmission shaft; 304. Limiting block; 305. Second positioning hole; 306. Elastic card; 4. Mounting seat; 5. Fixed base frame; 501. Connecting seat; 50 2. Limiting round rod; 6. Protective splint; 601. Adjusting plate; 602. Tension spring; 603. Limiting slide bar; 604. Adjusting button; 7. Fixed bracket; 701. Cylinder; 702. Fixed sleeve bracket; 703. Connecting block; 8. First adjusting frame; 801. Limiting bracket; 802. Connecting sleeve; 803. Limiting plug rod; 804. Restoring spring; 9. Second adjusting frame; 901. Travel wheel; 902. Support block; 903. Connecting plug plate; 904. Positioning block; 10. Fixed top seat; 11. Curved saw. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figures 1 to 8 : The present invention proposes a safe forestry tree pruning device, comprising: a support frame 1, wherein mounting side panels 2 are arranged on the left and right sides of the support frame 1, and the two mounting side panels 2 are symmetrically distributed; a walking frame 3 is arranged on the outer sides of the two mounting side panels 2; a mounting seat 4 is arranged between the two mounting side panels 2; a fixed base frame 5 is arranged at the bottom of the support frame 1; two protective splints 6 are arranged on the fixed base frame 5, and the two protective splints 6 are symmetrically distributed; a fixed bracket 7 is fixedly installed at the front of the mounting seat 4; a first adjustment bracket 8 is arranged on the right side of the fixed bracket 7; a second adjustment bracket 9 is arranged in front of the first adjustment bracket 8; a fixed top seat 10 is fixedly installed on the top of the support frame 1; two arc-shaped knife saws 11 are arranged on the fixed top seat 10, and the two arc-shaped knife saws 11 are symmetrically distributed; A fixed seat 101 is provided on the left and right sides of the support frame 1, and a servo motor 102 is fixedly installed on the fixed seat 101. A rotating shaft 103 is provided on the rotating shaft of the servo motor 102, and the rotating shaft 103 is rotatably connected to the fixed seat 101 through a bearing. An active bevel gear 104 is provided on the top of the rotating shaft 103.

[0024] In the present disclosure, Figure 4 and Figure 5 As shown, a connecting frame 201 is provided in the middle of the front side of the mounting side plate 2, and the connecting frame 201 is fixedly connected to the mounting seat 4, the mounting side plate 2 is provided with four limiting grooves 202, and the four limiting grooves 202 are distributed in a rectangular array, and four limiting sleeves 203 are provided on the inner sides of the two mounting side plates 2, and the limiting sleeves 203 correspond to the limiting grooves 202, and the limiting sleeves 203 are provided with a first positioning hole 204; A connecting shaft 205 is rotatably mounted on the mounting side plate 2 through a bearing, and a driven bevel gear 206 is provided at one end of the connecting shaft 205, and the driven bevel gear 206 is meshed and connected with the driving bevel gear 104; There are two pulleys 301 rotatably installed on the walking frame 3, and a crawler 302 is installed between the two pulleys 301. There is a transmission shaft 303 on one side of the upper pulley 301, and the transmission shaft 303 is connected to the connecting shaft 205. This device is powered by two servo motors 102 to drive the rotating shaft rod 103 to rotate. By using the meshing transmission of the driving bevel gear 104 and the driven bevel gear 206, and being connected through the transmission shaft 303 and the connecting shaft 205, it can drive the left and right pulleys 301 and the crawler 302 to drive simultaneously, and cooperate with the rear walking wheels 901 to climb up the trees to a specified height. At the same time, the arc saw 11 above is used for tree pruning operations, which saves the work of manual tree pruning, eliminates the need for high-risk aerial operations, and avoids personnel casualties; There are four limit blocks 304 on one side of the walking frame 3. The limit blocks 304 are provided with second positioning holes 305, and elastic clamping plates 306 are provided on the second positioning holes 305. When the walking frame 3 is assembled with the installation side plate 2, the limit blocks 304 penetrate through the limit grooves 202, and the limit blocks 304 are inserted into the limit sleeves 203, and the elastic clamping plates 306 penetrate through the first positioning holes 204 and the second positioning holes 305 at the same time. During the entire assembly process, since there is no need to use tools and bolts for connection and fixation, the loading and unloading efficiency of the walking frame 3 on the installation side plate 2 is improved. Therefore, during the non-working season or when the equipment is idle, the disassembled parts can be stored more conveniently.

[0025] In the embodiment of the present disclosure, as Figure 6 shown, a connection seat 501 is provided on the top of the fixed chassis 5, and the connection seat 501 is fixedly connected to the support frame 1. The fixed chassis 5 has a "C" - shaped structure, and there are two limit round rods 502 between the two vertical plates of the fixed chassis 5, and the two limit round rods 502 are distributed in a parallel manner; One end of the two protective clamping plates 6 is provided with adjusting plates 601. There are two tension springs 602 between the opposite inner sides of the two adjusting plates 601. There are limit sliding rods 603 on the opposite outer sides of the two adjusting plates 601, and adjusting knobs 604 are provided at the ends of the limit sliding rods 603; When the protective clamping plates 6 are in a connected state with the fixed chassis 5, the limit round rods 502 slide through the adjusting plates 601, and the tension springs 602 are sleeved on the limit round rods 502, and the limit sliding rods 603 slide through the vertical plates of the fixed chassis 5. In this invention, there are two protective clamping plates 6. By the adjusting knobs 604 and the limit sliding rods 603, the two protective clamping plates 6 can be pulled in the opposite direction, and by using the rebounding pulling effect of the tension springs 602, the two protective clamping plates 6 can be clamped on the tree trunk, which can effectively increase the contact stress with the tree bark and effectively avoid the situation of slipping and being unable to climb up.

[0026] Embodiment 2, on the basis of Embodiment 1, as Figure 7 and Figure 8 As shown, a cylinder 701 is provided at the front side of the fixed bracket 7, a fixed sleeve 702 is provided on the fixed bracket 7, and the fixed sleeve 702 is connected to the cylinder 701, and a connecting block 703 is provided at the end of the telescopic rod of the cylinder 701; A limit bracket 801 is provided on the first adjustment frame 8, and the limit bracket 801 is fixedly connected to the right walking frame 3, and the limit bracket 801 is rotatably connected to the first adjustment frame 8 through a pin shaft, a connecting sleeve 802 is provided at the rear end of the first adjustment frame 8, and two limit plugs 803 are provided at the rear end of the connecting sleeve 802, and the two limit plugs 803 are symmetrically distributed, and a restoring spring 804 is sleeved on the limit plug 803; A walking wheel 901 is rotatably installed at the rear of the second adjusting frame 9, a support block 902 is provided at the front end of the second adjusting frame 9, a connecting plug plate 903 is provided at the front end of the support block 902, a positioning block 904 is provided at the front end of the connecting plug plate 903, a front end of the limiting plug rod 803 is slidably inserted in the support block 902, and a restoring spring 804 is supported between the connecting sleeve 802 and the support block 902, and the connecting plug plate 903 is slidably inserted in the connecting sleeve 802. The present invention is provided with a first adjusting frame 8 and a second adjusting frame 9, through the sliding cooperation of the limiting plug rod 803 and the support block 902, and utilizing the elastic effect of the restoring spring 804, buffering can be performed during the tree pruning process of the arc knife saw 11, effectively reducing the resonance between the pruning device and the trees, making the pruning process smoother.

[0027] Working principle of this embodiment: During installation, the traveling frame 3 is assembled with the mounting side plate 2, the limiting block 304 passes through the limiting groove 202, and the limiting block 304 is inserted into the limiting sleeve 203, and the elastic clamping plate 306 passes through the first positioning hole 204 and the second positioning hole 305 at the same time. During the whole assembly process, since no tools and bolts are required for connection and fixing, the loading and unloading efficiency of the traveling frame 3 on the mounting side plate 2 is improved. Therefore, in the non-working season or when the equipment is idle, the disassembled parts can be stored more conveniently; When in use, two servo motors 102 provide power to drive the rotating shaft 103 to rotate, and the driving bevel gear 104 and the driven bevel gear 206 are meshed and transmitted, and the transmission shaft 303 is connected to the connecting shaft 205, which can simultaneously drive the left and right side pulleys 301 and the crawler 302 to transmit, and cooperate with the rear walking wheel 901 to climb up to a specified height along the trees, and use the arc-shaped knife saw 11 above to perform tree pruning operations; the adjusting button 604 and the limit slide bar 603 can be used to adjust the height of the tree. By pulling the two protective splints 6 in opposite directions and utilizing the rebound pulling effect of the tension spring 602, the two protective splints 6 can be clamped on the tree trunk, which can effectively increase the contact stress with the bark and effectively avoid the situation of slipping and being unable to climb up; by sliding the limiting plug rod 803 and the support block 902 together and utilizing the elastic effect of the restoring spring 804, the arc saw 11 can provide buffering during the process of pruning trees, effectively reducing the resonance between the pruning device and the trees, making the pruning process smoother.

[0028] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A safe forestry tree pruning device, characterized in that: Comprising: A support frame, on the left and right sides of which there are mounting side plates, and the two mounting side plates are distributed symmetrically; on the relatively outer sides of the two mounting side plates there are walking frames; between the two mounting side plates there is a mounting seat; at the bottom of the support frame there is a fixed bottom frame; on the fixed bottom frame there are two protective clamping plates, and the two protective clamping plates are distributed symmetrically; at the front of the mounting seat there is a fixed bracket fixedly installed; to the right of the fixed bracket there is a first adjusting frame; at the front of the first adjusting frame there is a second adjusting frame; at the top of the support frame there is a fixed top seat fixedly installed; on the fixed top seat there are two arc-shaped saws, and the two arc-shaped saws are distributed symmetrically. On the left and right sides of the support frame there are fixed seats, on which servo motors are fixedly installed. On the rotating shafts of the servo motors there are rotating shaft rods, and the rotating shaft rods are rotationally connected to the fixed seats through bearings. At the top of the rotating shaft rods there are driving bevel gears.

2. The safety type forestry tree pruning device according to claim 1, characterized in that In the middle position of the front side of the mounting side plate there is a connecting frame, and the connecting frame is fixedly connected to the mounting seat. The mounting side plate is provided with four limiting grooves, and the four limiting grooves are distributed in a rectangular array. On the relatively inner sides of the two mounting side plates there are four limiting sleeves, and the limiting sleeves correspond to the limiting grooves. On the limiting sleeves there are first positioning holes.

3. The safety type forestry tree pruning device according to claim 2, characterized in that On the mounting side plate there is a connecting shaft rotationally installed through a bearing. At one end of the connecting shaft there is a driven bevel gear, and the driven bevel gear is meshed and connected with the driving bevel gear.

4. The safety type forestry tree pruning device according to claim 1, characterized in that On the walking frame there are two belt pulleys rotationally installed, and between the two belt pulleys there is a crawler belt drivingly installed. On one side of the upper belt pulley there is a transmission shaft, and the transmission shaft is connected to the connecting shaft. On one side of the walking frame there are four limiting blocks, on which there are second positioning holes. On the second positioning holes there are elastic clamping plates. The limiting blocks penetrate through the limiting grooves, and the limiting blocks are inserted into the limiting sleeves, and the elastic clamping plates simultaneously penetrate through the first positioning holes and the second positioning holes.

5. The safety type forestry tree pruning device according to claim 1, characterized in that On the top of the fixed bottom frame there is a connecting seat, and the connecting seat is fixedly connected to the support frame. The fixed bottom frame is in a "C" - shaped structure, and between the two vertical plates of the fixed bottom frame there are two limiting round rods, and the two limiting round rods are distributed in parallel.

6. The safety type forestry tree pruning device according to claim 1, characterized in that At one end of the two protective clamping plates there are adjusting plates. Between the relatively inner sides of the two adjusting plates there are two tension springs. On the relatively outer sides of the two adjusting plates there are limiting slide rods, and at the ends of the limiting slide rods there are adjusting knobs.

7. The safety type forestry tree pruning device according to claim 6, characterized in that When the protective clamping plates are in a connected state with the fixed bottom frame, the limiting round rods slide through the adjusting plates, and the tension springs are sleeved on the limiting round rods, and the limiting slide rods slide through the vertical plates of the fixed bottom frame.

8. The safe forestry tree pruning device according to claim 1, characterized in that: A cylinder is arranged at the front side of the fixed bracket, a fixed sleeve is arranged on the fixed bracket, and the fixed sleeve is connected to the cylinder, and a connecting block is arranged at the end of the telescopic rod of the cylinder.

9. A safe forestry tree pruning device according to claim 1, characterized in that: The first adjusting frame is provided with a limit bracket, and the limit bracket is fixedly connected to the right walking frame, and the limit bracket is rotatably connected to the first adjusting frame through a pin shaft, a connecting sleeve is provided at the rear end of the first adjusting frame, and two limit rods are provided at the rear end of the connecting sleeve, and the two limit rods are symmetrically distributed, and a restoring spring is sleeved on the limit rod.

10. A safe forestry tree pruning device according to claim 1, characterized in that , A walking wheel is rotatably installed at the rear of the second adjustment frame, a support block is provided at the front end of the second adjustment frame, a connecting plug plate is provided at the front end of the support block, a positioning block is provided at the front end of the connecting plug plate, the front end of the limiting plug rod is slidably inserted in the support block, and a restoring spring is supported between the connecting sleeve and the support block, and the connecting plug plate is slidably inserted in the connecting sleeve.