Nut branch bud pruning equipment

By designing a guide groove and a reciprocating mechanism, the nut pruning equipment solves the problem that fruit tree pruning shears cannot fix branches and buds, achieving efficient and accurate pruning, and improving pruning efficiency and equipment durability.

CN223666862UActive Publication Date: 2025-12-16YUANJIANG ZHANGHAI FRUIT PLANTING CO LTD
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Patent Information

Application Number
CN202423172257.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-12-16
Estimated Expiration
2034-12-23

AI Technical Summary

Technical Problem

Existing fruit tree pruning shears are ineffective at fixing branches and buds, leading to increased pruning difficulty and reduced pruning efficiency.

Method used

Design a nut bud pruning device that includes a guide groove, clamping block, extension rod, sleeve, limiting rod, telescopic rod and pruning mechanism. Through the synergistic effect of the reciprocating mechanism and the inclined guide groove, the device can achieve stable fixation and efficient pruning of buds.

Benefits of technology

It significantly improves pruning efficiency and accuracy, ensures adaptability to branches and buds of different diameters, and extends the service life of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model is suitable for the technical field of branch bud pruning equipment, and provides nut branch bud pruning equipment which comprises a fruit tree shear shell. The two guide grooves are both fixedly installed in the fruit tree shear shell; the two clamping blocks are installed in the two guide grooves in a sliding mode respectively and used for fixing nut branch buds; the two extension rods are respectively hinged to the two clamping blocks; the casing pipe is arranged on the two extension rods in a sleeving manner, and the casing pipe is connected with the two extension rods in a sliding manner; and the two limiting rods are fixedly mounted in the sleeve, are in sliding contact with the two extension rods respectively and are used for connecting the extension rods with the sleeve. According to the pruning equipment for the nut branch buds, the to-be-pruned nut branch buds can be fixed, it is guaranteed that the pruning equipment makes contact with the branch buds, and the pruning efficiency is improved.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to branch and bud pruning equipment technical field, especially a kind of for nut branch and bud pruning equipment. BACKGROUND

[0002] Nuts, such as macadamia (also known as Hawaii nuts), usually have vigorous growth, and can grow throughout the year. If left unchecked, the branches will be excessive, producing bushy branches, broom branches, and disorganized structures, affecting the ventilation and light transmission of the fruit trees, causing poor growth of the tree, weakening the wind and lodging resistance of the tree, and thus affecting the yield. Therefore, shaping and pruning is an indispensable work in nut management.

[0003] Manual pruning methods mainly use fruit tree shears, fruit tree pruning saws and other tools. Fruit tree shears are generally used to prune finer branches on nut trees. When the fruit tree shears come into contact with the branches, it is easy to push the branches forward, making pruning more difficult and reducing pruning efficiency. SUMMARY

[0004] The utility model provides a kind of for nut branch and bud pruning equipment, to solve the problem that the fruit tree shears currently used cannot fix the branch to be pruned, making pruning more difficult and reducing pruning efficiency, as proposed in the above background.

[0005] To solve the above problems, the utility model is realized as follows: a kind of for nut branch and bud pruning equipment, comprising: a fruit tree shear shell;Two guide grooves, both of the two guide grooves are fixedly installed in the fruit tree shear shell;Two clamping blocks, both of the two clamping blocks are slidably installed in both of the two guide grooves, for fixing nut branches;Two extension rods, both of the two extension rods are hingedly connected to both of the two clamping blocks;A sleeve, the sleeve is sleeved on both of the two extension rods and is in sliding connection with both of the two extension rods;Two limit rods, both of the two limit rods are fixedly installed in the sleeve and are in sliding contact with both of the two extension rods, for connecting the extension rod and the sleeve;A telescopic rod, the telescopic rod is fixedly installed on the fruit tree shear shell, and the output rod of the telescopic rod is hingedly connected to the sleeve;A pruning mechanism, the pruning mechanism is arranged in the fruit tree shear shell, for cutting off nut branches.

[0006] Preferably, the pruning mechanism comprises a movable slot, a connecting block, two pruning blades, a driving motor, two cams and a reset mechanism, the movable slot is fixedly installed in the fruit tree shears shell, the connecting block is slidingly installed on the movable slot, both of the two pruning blades are hingedly connected to the connecting block, the pruning ends of the two pruning blades slidingly contact and extend out of the opening end of the fruit tree shears shell, the driving motor is fixedly installed on the fruit tree shears shell, the output shaft of the driving motor extends into the fruit tree shears shell, both of the two cams are fixedly installed on the output shaft of the driving motor and respectively abut against the two pruning blades, and the reset mechanism is arranged on the two pruning blades and used for driving the two pruning blades to reset.

[0007] Preferably, the reset mechanism comprises two fixed shafts and a spring, the two fixed shafts are respectively fixedly installed on the two pruning blades, and the spring is fixedly installed between the two fixed shafts.

[0008] Preferably, the connecting block is arranged in a U shape, the bottom of the connecting block is slidingly connected to the movable slot, and the protrusion on the side of the connecting block close to the opening end of the fruit tree shears shell is hingedly connected to the pruning blade.

[0009] Preferably, the fruit tree shears shell is provided with a reciprocating mechanism for pushing the pruning blade to extend out of the fruit tree shears shell, the reciprocating mechanism is arranged in correspondence with the pruning mechanism, and the reciprocating mechanism comprises a disc, a connecting rod, a limiting shaft and a limiting slot, the disc is fixedly installed on the output shaft of the driving motor, the connecting rod is hingedly connected to the protrusion on the other end of the connecting block, the limiting shaft is fixedly installed on the connecting rod, the limiting slot is arranged in a "D" shape on the disc and is in sliding connection with the limiting shaft.

[0010] Preferably, the connecting rod is arranged between the disc and the two cams, the connecting rod is provided with a movable opening, and the inner wall of the movable opening is in sliding contact with the output shaft of the driving motor.

[0011] Preferably, the two guide grooves are arranged in an inclined manner, and the distance between the two guide grooves is directly proportional to the distance between the two guide grooves and the opening end of the fruit tree shears shell.

[0012] Compared with the related art, the nut branch pruning equipment has the following beneficial effects:

[0013] Compared with the prior art, the nut branch pruning device provided by the scheme significantly improves the pruning efficiency and accuracy by introducing a reciprocating mechanism, optimizing the design of a guide groove, and ingeniously arranging a connecting rod. The reciprocating mechanism realizes the reciprocating movement of a pruning blade through the synergistic effect of a disc, a connecting rod, a limiting shaft, and a limiting groove, so that the nut tree branches and buds can be pruned more stably and quickly. At the same time, the inclined guide groove design enables the clamping block to move along the predetermined trajectory, ensuring the accuracy of the pruning position and improving the adaptability to branches and buds of different diameters. In addition, the movable port design on the connecting rod reduces the friction and wear between the driving motor output shaft, prolonging the service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a front view structural schematic diagram of a nut branch pruning device provided by the utility model;

[0015] Figure 2 is a rear view structural schematic diagram of a nut branch pruning device provided by the utility model;

[0016] Figure 3 is a front view structural schematic diagram of a nut branch pruning device provided by the utility model;

[0017] Figure 4 is a side view structural schematic diagram of an extension rod, a sleeve, and a limiting rod provided by the utility model;

[0018] Figure 5 is an enlarged structural schematic diagram of part A shown in Figure 3

[0019] Reference signs: 1, fruit tree pruning shell; 2, guide groove; 3, clamping block; 4, extension rod; 5, sleeve; 6, limiting rod; 7, telescopic rod; 8, movable slot; 9, connecting block; 10, pruning blade; 11, driving motor; 12, cam; 13, fixed shaft; 14, spring; 15, disc; 16, connecting rod; 17, limiting shaft; 18, limiting groove; 19, movable port. DETAILED DESCRIPTION

[0020] ​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order; the terms "inner," "outer," "left," and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] This utility model embodiment provides a device for pruning nut branches and buds, such as... Figures 1-5 As shown, the nut pruning device includes: a nut pruning shear shell 1; two guide grooves 2, both of which are fixedly installed inside the nut pruning shear shell 1; two clamping blocks 3, which are slidably installed inside the two guide grooves 2 for fixing nut pruning branches; two extension rods 4, which are hinged to the two clamping blocks 3; a sleeve 5, which is sleeved on the two extension rods 4 and slidably connected to them; two limiting rods 6, which are fixedly installed inside the sleeve 5 and slidably contact the two extension rods 4 for connecting them; a telescopic rod 7, which is fixedly installed on the nut pruning shear shell 1, and the output rod of the telescopic rod 7 is hinged to the sleeve 5; and a pruning mechanism, which is disposed inside the nut pruning shear shell 1 for cutting nut pruning branches.

[0023] In this embodiment, the fruit tree shears shell 1 is the main structure of the whole pruning device, providing installation and support for other components. The guide groove 2 is used to guide the sliding of the clamping block 3, ensuring that the clamping block can accurately clamp the nut sprout. The clamping block 3 is used to fix the nut sprout, preventing the sprout from moving or shaking during pruning, improving the accuracy of pruning. The extension rod 4 is in sliding connection with the sleeve 5, which can realize the connection with the telescopic rod 7, ensuring the stability of clamping to adapt to nut sprouts of different thicknesses. The sleeve 5 is used to connect and stabilize the extension rod 4, ensuring that the force of the telescopic rod 7 can be transmitted to the two clamping blocks 3. The limiting rod 6 ensures the stable connection between the sleeve 5 and the extension rod 4. The telescopic movement of the telescopic rod 7 can drive the movement of the sleeve 5 and the clamping block 3, realizing the clamping and loosening of the clamping block on the nut sprout. The pruning mechanism is used to cut off the nut sprout, which is the key component to complete the pruning work, and can accurately cut off the nut sprout, ensuring the pruning effect. In use, first, the fruit tree shears shell 1 is aligned with the nut sprout to be pruned, then the telescopic rod 7 is extended and retracted to drive the sleeve 5 and the clamping block 3 to move, so that the clamping block 3 clamps the nut sprout, and the pruning mechanism is started to cut off the nut sprout. The overall structure design is reasonable, the operation is simple, the nut tree pruning efficiency and pruning quality can be significantly improved, and the growth and yield of the nut tree can be improved.

[0024] In further preferred embodiments of the utility model, the pruning mechanism includes a movable groove 8, a connecting block 9, two pruning blades 10, a drive motor 11, two cams 12 and a reset mechanism, the movable groove 8 is fixedly installed in the fruit tree shears shell 1, the connecting block 9 is slidably installed on the movable groove 8, both the two pruning blades 10 are hingedly connected to the connecting block 9, the pruning ends of the two pruning blades 10 are in sliding contact and extend to the outside of the open end of the fruit tree shears shell 1, the drive motor 11 is fixedly installed on the fruit tree shears shell 1, the output shaft of the drive motor 11 extends into the fruit tree shears shell 1, both the two cams 12 are fixedly installed on the output shaft of the drive motor 11 and abut against both the two pruning blades 10 respectively, and the reset mechanism is arranged on both the two pruning blades 10 to drive both the two pruning blades 10 to reset.

[0025] In this embodiment, the movable groove 8 provides a sliding track for the connecting block 9, ensuring the stability and accuracy of the pruning blade 10 during pruning. The connecting block 9 serves as a support and transmission component for the pruning blade 10. The pruning blade 10 slides in contact with and extends beyond the open end of the fruit tree pruner shell 1 for direct pruning of nut branch sprouts. The pruning blade 10 is designed to be sharp and durable, ensuring the efficiency and effectiveness of pruning. The driving motor 11 provides power for the pruning mechanism, and the output shaft of the driving motor 11 extends into the fruit tree pruner shell 1 to drive the cam 12 to rotate. When the driving motor 11 is started, the rotation of the cam 12 will push the pruning blade 10 to open and close, thereby achieving pruning of nut branch sprouts. The reset mechanism is used to reset the pruning blade 10 after pruning is completed, ensuring that the pruning blade 10 can quickly return to the initial position after each pruning, preparing for the next pruning. Through the cooperation of the driving motor 11 and the cam 12, the pruning blade 10 can quickly open and close, significantly improving the pruning efficiency. Through accurate pruning, the crown structure of the nut tree can be optimized, improving the ventilation and light transmission performance, thereby promoting the growth and yield of the nut tree.

[0026] In further preferred embodiments of the present application, the reset mechanism includes two fixed shafts 13 and a spring 14, and the two fixed shafts 13 are fixedly installed on the two pruning blades 10, respectively, and the spring 14 is fixedly installed between the two fixed shafts 13.

[0027] In this embodiment, the fixed shaft 13 serves as the support point of the spring 14, which is firm and stable, and can ensure that the spring 14 maintains the correct position and shape during long-term use. The spring 14 is the core component of the reset mechanism. The spring 14 has elastic restoring force, which can quickly pull the pruning blade 10 back to its original position after being pushed open by the cam 12. This design ensures that the pruning blade 10 can be accurately reset after each pruning, preparing for the next pruning. During pruning, when the driving motor 11 is started and drives the cam 12 to rotate, the profile of the cam 12 will push the pruning blade 10 to open, thereby cutting off the nut branch sprouts. Once the pushing action of the cam 12 disappears, the elastic restoring force of the spring 14 will immediately act, pulling the pruning blade 10 to quickly reset along the fixed shaft 13. In this way, the pruning blade 10 can quickly return to the initial position in a short time, preparing for the next pruning. The design of the reset mechanism enables the pruning blade 10 to quickly reset after each pruning, thereby reducing the waiting time and improving the pruning efficiency. Since the pruning blade 10 can be accurately reset, the position and angle of each pruning can be kept consistent, thereby ensuring the stability and reliability of the pruning quality. The elastic restoring force of the spring 14 can help to offset part of the impact force, protecting the pruning blade 10 and the cam 12 from damage.

[0028] The utility model discloses further preferable embodiment, the connecting block 9 is arranged to U type, the bottom of connecting block 9 is slidably connected with movable slot 8, the protruding block of connecting block 9 near the opening end side of fruit tree pruning shell 1 is hinged with pruning blade 10.

[0029] In the embodiment, the connecting block 9 is arranged as a U-shaped structure, which provides greater stability and strength, and facilitates the hinging with the pruning blade 10. The U-shaped structure also effectively disperses stress, reducing the deformation or damage that may occur during pruning. The bottom of the connecting block 9 is slidably connected with the movable slot 8, which allows the connecting block 9 to move smoothly and accurately within the movable slot 8. The U-shaped design and sliding connection ensure the stability and accuracy of the connecting block 9 during pruning, thereby improving the pruning precision. This helps to reduce the situation of mispruning or missed pruning, ensuring the consistency of pruning effect. The U-shaped structure and hinging design enable the connecting block 9 and the pruning blade 10 to withstand greater stress and impact force, thereby enhancing the durability of the device. This helps to prolong the service life of the device and reduce maintenance and replacement costs.

[0030] In the further preferable embodiment of the utility model, a reciprocating mechanism is arranged in the fruit tree pruning shell 1 for pushing the pruning blade 10 to extend out of the fruit tree pruning shell 1. The reciprocating mechanism is correspondingly arranged with the pruning mechanism. The reciprocating mechanism includes a disc 15, a connecting rod 16, a limiting shaft 17, and a limiting groove 18. The disc 15 is fixedly installed on the output shaft of the driving motor 11. The connecting rod 16 is hinged on the protruding block at the other end of the connecting block 9. The limiting shaft 17 is fixedly installed on the connecting rod 16. The limiting groove 18 is opened on the disc 15 and is arranged as a "D" shape. The limiting groove 18 is slidably connected with the limiting shaft 17.

[0031] In this embodiment, when the driving motor 11 starts, the disc 15 will rotate with the output shaft, thereby driving the entire reciprocating mechanism to work. The design of the connecting rod 16 allows it to swing within a certain range, thereby driving the trimming blade 10 to reciprocate. The limiting shaft 17 is used for sliding connection with the limiting groove 18 on the disc 15. The design of the limiting shaft 17 ensures the stability and accuracy of the connecting rod 16 during the rotation of the disc 15. The limiting groove 18 is arranged in a "D" shape, so that when the limiting shaft 17 slides in the limiting groove 18, it can drive the connecting rod 16 to swing reciprocally. At the same time, the "D" shaped limiting groove 18 also provides sufficient space to allow the limiting shaft 17 to move as necessary during the rotation of the disc 15. When the driving motor 11 starts, the disc 15 will rotate with the output shaft. Since the limiting shaft 17 is in sliding connection with the limiting groove 18, the rotation of the disc 15 will drive the connecting rod 16 to swing reciprocally. The swing of the connecting rod 16 will further drive the connecting block 9 and the trimming blade 10 to reciprocate, thereby realizing the function of the trimming blade 10 extending out of the fruit tree sheath 1 for trimming. After the trimming blade 10 extends out, the protrusion pushes the trimming blade 10 to trim the branch buds.

[0032] In a further preferred embodiment of the present application, the connecting rod 16 is arranged between the disc 15 and the two cams 12, and the connecting rod 16 is provided with a movable opening 19, and the inner wall of the movable opening 19 is in sliding contact with the output shaft of the driving motor 11.

[0033] In this embodiment, the connecting rod 16 can drive the reciprocating movement of the trimming blade 10 without affecting the rotation of the disc 15 and the cam 12. The movable opening 19 facilitates the free rotation of the output shaft of the driving motor 11 without affecting the movement of the connecting rod 16, which is conducive to ensuring the normal operation of the reciprocating mechanism. Arranging the connecting rod 16 between the disc 15 and the two cams 12 optimizes the overall layout. This design makes the entire trimming mechanism more compact and efficient, facilitating portability and use. The design of the movable opening 19 reduces the friction and wear between the connecting rod 16 and the output shaft, thereby prolonging the service life of the equipment. This helps to reduce maintenance and replacement costs and improve the economy of the equipment.

[0034] In a further preferred embodiment of the present application, the two guide grooves 2 are arranged in an inclined manner, and the distance between the two guide grooves 2 is proportional to the distance from the opening end of the fruit tree sheath 1.

[0035] In this embodiment, the inclined guide grooves 2 are used to guide the movement direction of the clamping blocks 3 during pruning, ensuring that they can be fixed along the predetermined trajectory of the nut tree branches. As the guide grooves 2 gradually approach the opening end of the fruit tree shears shell 1, the distance between them gradually decreases. This gradually decreasing distance facilitates the fixation of 3 nut tree branches, which can be adjusted according to the diameter of the branches. The inclined guide grooves 2 ensure that the clamping blocks 3 can move along the predetermined trajectory during pruning, thereby providing more accurate pruning positions. This helps to reduce the risk of mispruning or missed pruning, improving the accuracy and consistency of pruning. The design of the gradually decreasing distance between the guide grooves 2 allows the clamping blocks 3 to adapt to the diameter of the branches. This design not only improves the efficiency of pruning, but also ensures that the clamping blocks 3 can firmly clamp branches of different diameters, avoiding pruning failure due to unstable clamping.

[0036] In summary, compared with related technologies, the nut tree branch pruning device significantly improves the efficiency and accuracy of pruning by introducing a reciprocating mechanism, optimizing the design of guide grooves, and cleverly arranging connecting rods. The reciprocating mechanism uses the coordinated action of the disc, connecting rod, limiting shaft, and limiting groove to achieve the reciprocating movement of the pruning blade, thereby enabling more stable and faster pruning of nut tree branches. At the same time, the inclined guide groove design allows the clamping blocks to move along a predetermined trajectory, ensuring the accuracy of the pruning position and improving the adaptability to branches of different diameters. In addition, the design of the movable port on the connecting rod reduces friction and wear between the output shaft of the driving motor and the connecting rod, prolonging the service life of the device.

[0037] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways.

[0038] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the protection scope of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art can still combine, delete or make other adjustments to the features in the embodiments of the present application without creative labor, so as to obtain different other technical solutions which do not deviate from the concept of the present application in essence. These technical solutions also belong to the scope of protection of the present application.

Claims

1. A nut shoot pruning apparatus, comprising: Include: Fruit tree shears shell; Two guide grooves, two said guide groove is fixedly installed in the fruit tree shears shell; Two clamping blocks, two said clamping block is respectively installed in two said guide groove, for fixed nut branch; Two extension rods, two said extension rod is respectively hinged in two said clamping block; Sleeve, the sleeve is sleeved on two said extension rod, and is in sliding connection with two said extension rod; Two limit rods, two said limit rod is fixedly installed in the sleeve, and is respectively in sliding contact with two said extension rod, for connecting extension rod and sleeve; Telescopic rod, the telescopic rod is fixedly installed on the fruit tree shears shell, and the output rod of the telescopic rod is hinged with the sleeve; Pruning mechanism, the pruning mechanism is arranged in the fruit tree shears shell, for cutting off nut branch.

2. The apparatus for nut shoot pruning as claimed in claim 1, wherein, The pruning mechanism includes a movable slot, a connecting block, two pruning blades, a drive motor, two cams and a reset mechanism, the movable slot is fixedly installed in the fruit tree shears shell, the connecting block is slidably installed on the movable slot, two said pruning blade is hinged on the connecting block, the pruning end of two said pruning blade is in sliding contact, and extends to the opening end of the fruit tree shears shell, the drive motor is fixedly installed on the fruit tree shears shell, the output shaft of the drive motor extends into the fruit tree shears shell, two said cam is fixedly installed on the output shaft of the drive motor, and is respectively in contact with two said pruning blade, the reset mechanism is arranged on two said pruning blade, for driving two pruning blades reset.

3. The apparatus for nut shoot pruning as claimed in claim 2, wherein, The reset mechanism includes two fixed shafts and a spring, two said fixed shaft is respectively fixedly installed on two said pruning blade, and the spring is fixedly installed between two said fixed shaft.

4. The apparatus for nut shoot pruning as claimed in claim 2, wherein, The connecting block is arranged in U shape, the bottom of the connecting block is in sliding connection with the movable slot, and the protrusion on the side of the connecting block close to the opening end of the fruit tree shears shell is hinged with the pruning blade.

5. The apparatus for nut shoot pruning as claimed in claim 2, wherein, The fruit tree shears shell is provided with a reciprocating mechanism for pushing the pruning blade to extend out of the fruit tree shears shell, the reciprocating mechanism is arranged correspondingly with the pruning mechanism, the reciprocating mechanism includes a disc, a connecting rod, a limiting shaft and a limiting groove, the disc is fixedly installed on the output shaft of the drive motor, the connecting rod is hinged on the protrusion on the other end of the connecting block, the limiting shaft is fixedly installed on the connecting rod, the limiting groove is formed in the disc and arranged in "D" shape, and the limiting groove is in sliding connection with the limiting shaft.

6. The apparatus for nut shoot pruning as claimed in claim 5, wherein, The connecting rod is arranged between the disc and two said cam, and the inner wall of the movable port formed in the connecting rod is in sliding contact with the output shaft of the drive motor.

7. The apparatus for nut shoot pruning as claimed in claim 1, wherein, Two said guide groove is arranged in inclined shape, and the distance between two said guide groove is proportional to the distance from the opening end of the fruit tree shears shell.