Fastening mechanism and fruit tree girdling machine

Abstract

The utility model relates to the field of agriculture and forestry machines and tools, and discloses a fastening mechanism and a fruit tree girdling machine, the fastening mechanism comprises a machine shell and a fastening assembly, the machine shell is provided with a cutting cavity suitable for placing a tree trunk, the fastening assembly is rotatably connected with the cutting cavity, the fastening assembly comprises a tension spring, a first connecting rod and a first abutting piece, and the first connecting rod and the first abutting piece are circumferentially distributed on the outer side of the cutting cavity; the first connecting rod is rotationally connected with the first abutting piece, the first abutting piece is suitable for abutting against the tree trunk in the cutting cavity, and the two ends of the tension spring are connected with the first connecting rod and the first abutting piece at the same time; when the tree cutting device starts to work, the first connecting rod rotates and drives the first abutting piece to enter the cutting cavity to abut against a tree trunk, the tension spring provides inward tension for the first abutting piece so as to resist repulsive force caused by the uneven surface of the cut tree, the tree cutting device can better fit the shape of the surface of the tree, the first abutting piece abuts against the tree trunk, and the tree trunk is kept at the stable position in the cutting cavity; therefore, the cutting stability is improved, and the cutting effect under the complex cutting condition is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of forestry machines, in particular to a fastening mechanism and a fruit tree girdling machine. BACKGROUND

[0002] Girdling (also known as ring peeling) is a technique of cutting the trunk in a ring shape during the growth period of fruit trees. By peeling the bark between the two cutting edges and exposing the wood, girdling can temporarily hinder the downward transport of organic matter, reduce the nutrient supply of the root system, promote the accumulation of nutrients above the peeled opening, thereby effectively inhibiting vegetative growth, promoting flower bud differentiation, and significantly improving fruit quality. The existing electric girdling equipment has the following problems in actual application: due to the inconsistency of the hardness and surface flatness of the bark at different positions (such as the greater and harder degree of concave-convex at the knot position), the actual cutting force during girdling is often unstable, the equipment is prone to vibration and deviation, resulting in excessive cutting depth of the cutting tool, motor stall, or insufficient cutting depth, and the bark cannot be completely peeled. The above problems not only significantly reduce the work efficiency of girdling operation, but also may cause unnecessary damage to the fruit trees, limiting the promotion and application of electric girdling technology. Therefore, it is necessary to design an electric girdling equipment that is stable in work and easy to operate, to improve the overall effect of girdling operation. SUMMARY

[0003] To solve at least one aspect of the above problems, the utility model first provides a fastening mechanism, which comprises a machine shell and a fastening assembly, the machine shell is provided with a cutting cavity suitable for placing a trunk, the fastening assembly and the cutting cavity are rotationally connected, the fastening assembly comprises a tension spring, a first connecting rod and a first abutting piece circumferentially distributed outside the cutting cavity, the first connecting rod and the first abutting piece are rotationally connected, the first abutting piece is suitable for abutting against the trunk in the cutting cavity, and the two ends of the tension spring are connected with the first connecting rod and the first abutting piece; when starting to work, the first connecting rod rotates and drives the first abutting piece to enter the cutting cavity and abut against the trunk, the tension spring provides an inward pulling force for the first abutting piece to make the first abutting piece tightly abut against the trunk, so that the trunk maintains a stable position in the cutting cavity.

[0004] Optionally, it also comprises a rotating disc, the rotating disc is provided with a tree clamping opening communicating with the cutting cavity, the trunk enters the cutting cavity through the tree clamping opening, the rotating disc is rotationally connected with the machine shell, and the fastening assembly is connected with the rotating disc and rotates around the cutting cavity together with the rotating disc.

[0005] Optionally, the shell is provided with a positioning seat, a positioning block is rotatably connected to the positioning seat, a first torsion spring is connected between the positioning seat and the positioning block, and two ends of the first torsion spring are respectively abutted against the positioning seat and the positioning block.

[0006] Optionally, the positioning block is provided with an arc-shaped guide portion on a side close to the cutting cavity, a side wall of the positioning portion is arc-shaped, and the guide portion is slidably connected to the positioning portion.

[0007] Optionally, the fastening assembly further comprises a first limiting column, and an end of the first connecting rod away from the first abutting piece is provided with a limiting block, the first limiting column is arranged on a rotation path of the limiting block and is abutted against the limiting block, and the first limiting column is abutted against the positioning portion.

[0008] Optionally, the fastening assembly further comprises a first limiting column, and an end of the first connecting rod away from the first abutting piece is provided with a limiting block, the first limiting column is arranged on a rotation path of the limiting block and is abutted against the limiting block, and the first limiting column is abutted against the positioning portion.

[0009] Optionally, one end of the first abutting piece is provided with a connecting portion, an end of the first connecting rod away from the connecting portion is provided with a connecting hole, and two ends of the tension spring are simultaneously hooked to the connecting portion and the connecting hole.

[0010] Optionally, the fastening assembly further comprises a first limiting column, and an end of the first connecting rod away from the first abutting piece is provided with a limiting block, the first limiting column is arranged on a rotation path of the limiting block and is abutted against the limiting block, and the first limiting column is abutted against the positioning portion.

[0011] Optionally, the cutting assembly further comprises a second abutting member and a connecting seat, the second abutting member is adapted to abut the trunk in the cutting cavity, the connecting seat is fixedly connected with the second connecting rod and the second abutting member, the cutting knife is fixed on the connecting seat, and the second abutting member and the first abutting member cooperate to clamp the trunk in the cutting cavity.

[0012] Compared with the prior art, in the utility model, when the tree enters the cutting cavity to wait for girdling, the fastening assembly rotates into the cutting cavity and abuts against the trunk, so that the trunk is limited in a certain movement range, thereby improving the stability during cutting; the first connecting rod and the first abutting member are rotationally connected, and the pulling spring always provides an inward pulling force to resist the repulsive force caused by the uneven surface of the tree, so that the cutting machine can better fit the surface shape of the tree and always maintain the stable fastening effect on the tree, thereby effectively improving the cutting effect under complex cutting conditions.

[0013] In addition, the utility model provides a fruit tree girdling machine which comprises the fastening mechanism.

[0014] Compared with the prior art, the fruit tree girdling machine has the same advantages as the fastening mechanism, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure diagram of the fruit tree girdling machine of the utility model embodiment.

[0016] Figure 2 It is an enlarged view of A part. Figure 1

[0017] Figure 3 It is an enlarged view of B part. Figure 1

[0018] Figure 4 It is a connecting structure diagram of the fastening assembly, the cutting assembly and the rotating disc of the utility model embodiment.

[0019] EXPLANATION OF REFERENCE NUMERALS:

[0020] ​​1, the shell; 11, cutting cavity; 12, positioning seat; 13, positioning block; 131, guide portion; 14, first torsion spring; 2, fastening assembly; 21, tension spring; 22, first connecting rod; 221, positioning portion; 222, limiting block; 223, connecting hole; 23, first abutting piece; 231, connecting portion; 232, abutting portion; 24, first limiting column; 3, cutting assembly; 31, cutter; 32, second connecting rod; 33, third torsion spring; 34, second limiting column; 35, second mounting column; 36, second abutting piece; 37, connecting seat; 38, third connecting rod; 4, rotating disc; 41, clamping opening; 42, fixed seat; 421, first mounting column; 422, mounting hole; 43, second torsion spring. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0022] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower" and the like is based on the orientation or position relationship when the product is normally used.

[0023] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one feature. The drawings of the embodiments of the utility model are provided with a coordinate system XYZ, wherein the positive direction of the X axis represents the left direction, the negative direction of the X axis represents the right direction, the positive direction of the Y axis represents the front direction, the negative direction of the Y axis represents the rear direction, the positive direction of the Z axis represents the upper direction, and the negative direction of the Z axis represents the lower direction.

[0024] The utility model embodiment provides a kind of fastening mechanism, in combination with Figures 1-4 As shown in the figure, it comprises shell 1 and fastening assembly 2, the shell 1 is equipped with the cutting cavity 11 suitable for placing trunk, the fastening assembly 2 and the cutting cavity 11 are rotatably connected, the fastening assembly 2 includes tension spring 21 and the first connecting rod 22 and the first abutting piece 23 distributed in the circumferential direction on the outside of the cutting cavity 11, the first connecting rod 22 and the first abutting piece 23 are rotatably connected, the first abutting piece 23 is suitable for abutting the trunk in the cutting cavity 11, and the two ends of the tension spring 21 are simultaneously connected with the first connecting rod 22 and the first abutting piece 23;When starting work, the first connecting rod 22 rotates and drives the first abutting piece 23 to enter the cutting cavity 11 and abut the trunk, and the tension spring 21 provides inward tension for the first abutting piece 23, so that the first abutting piece 23 abuts tightly the trunk, so that the trunk keeps stable position in the cutting cavity 11.

[0025] As Figure 1And 2 As shown in the figure, in the embodiment, the first connecting rod 22 is arc-shaped on the side close to the cutting cavity 11 and is adapted to abut against the trunk in the cutting cavity 11, the first abutting piece 23 is also arc-shaped on the side close to the cutting cavity 11, one end of the first connecting rod 22 is rotationally connected to the middle part of the first abutting piece 23, and the end of the first abutting piece 23 away from the first connecting rod 22 is provided with an abutting part 232 which is approximately drop-shaped and is adapted to abut against the trunk in the cutting cavity 11. The first connecting rod 22 and the first abutting piece 23 are distributed on the outside of the cutting cavity 11, thereby forming a tendency of embracing the tree in the cutting cavity 11. The fastening assembly can be fixed on the casing 1 or can be rotationally connected to the casing 1.

[0026] The fastening mechanism in the utility model, when the tree enters the cutting cavity 11 to wait for girdling, the fastening assembly 2 rotates into the cutting cavity 11 and abuts against the trunk, so that the trunk is limited in a certain range of movement, thereby improving the stability during cutting; the first connecting rod 22 and the first abutting piece 23 are rotationally connected, and the tension spring 21 always provides an inward tension force to resist the repulsive force brought by the uneven surface of the tree, so that the utility model can better fit the surface shape of the tree and always maintain the stable fastening effect on the tree, thereby effectively improving the cutting effect under complex cutting conditions.

[0027] Optionally, the utility model also comprises a rotating disc 4, the rotating disc 4 is provided with a tree clamping opening 41 which is communicated with the cutting cavity 11, the trunk enters the cutting cavity 11 through the tree clamping opening 41, the rotating disc 4 is rotationally connected with the casing 1, and the fastening assembly 2 is connected with the rotating disc 4 and rotates around the cutting cavity 11 together with the rotating disc 4.

[0028] As shown in the figure, Figure 1 And 4 As shown in the figure, in the embodiment, the tree clamping opening 41 is approximately U-shaped, the bottom of the tree clamping opening 41 is provided with a sliding rail, the casing 1 is provided with a sliding groove, and the sliding rail and the sliding groove are slidingly connected, so that the rotating disc 4 rotates around the cutting cavity 11 to perform girdling of the trunk.

[0029] Optionally, a positioning seat 12 is protruding on the housing 1, and a positioning block 13 is rotatably connected to the positioning seat 12. A first torsion spring 14 is connected between the positioning seat 12 and the positioning block 13. The two torsion arms of the first torsion spring 14 abut against the positioning seat 12 and the positioning block 13 respectively. A positioning part 221 is protruding at the end of the first connecting rod 22 away from the first abutting member 23. The positioning part 221 is adapted to abut against the positioning block 13. The positioning block 13 is limited to the reverse rotation path of the positioning part 221. When the positioning part 221 abuts against the positioning block 13, the fastening assembly 2 is in the initial position. When the first connecting rod 22 rotates forward around the cutting cavity 11, the positioning part 221 disengages from the positioning block 13, so that the first connecting rod 22 can drive the first abutting member 23 into the cutting cavity 11 to abut against the tree trunk.

[0030] like Figure 2 As shown, in this embodiment, the end of the positioning block 13 away from the positioning seat 12 is adapted to abut against the positioning part 221, and the positioning part 221 protrudes in a direction away from the cutting cavity 11. When an external force drives the positioning block 13 to rotate counterclockwise relative to the positioning seat 12, the first torsion spring 14 is compressed. When the external force disappears, the positioning block 13 returns to its original position under the action of the first torsion spring 14.

[0031] Optionally, the positioning block 13 has an arc-shaped guide portion 131 on the side near the cutting cavity 11, and the sidewall of the positioning portion 221 is arc-shaped. The guide portion 131 is slidably connected to the positioning portion 221. When the fastening assembly 2 is in the initial position, one end of the positioning block 13 abuts against the positioning portion 221 to restrict the positioning portion 221 from rotating in the opposite direction. When the first connecting rod 22 rotates one revolution around the cutting cavity 11 in the forward direction, the positioning portion 221 slides past the guide portion 131 to push the positioning block 13 to rotate and avoid it, so that the positioning portion 221 can return to the initial position.

[0032] like Figure 2 As shown, when the rotating disk 4 rotates one revolution clockwise, the positioning part 221 slides past the guide part 131 and drives the positioning block 13 to rotate slightly counterclockwise. After the positioning part 221 passes the positioning block 13, the positioning block 13 rebounds back to its original position under the action of the first torsion spring 14. At this time, the rotating disk 4 is driven to rotate in the opposite direction again, so that the positioning part 221 abuts against one end of the positioning block 13 to return to the initial position.

[0033] It is worth noting that in the present embodiment, the positioning seat 12, the positioning block 13 and the fastening assembly 2 are all arranged at the right side of the casing 1, so the forward rotation is clockwise rotation and the reverse rotation is counterclockwise rotation. In other embodiments, when the positioning seat 12, the positioning block 13 and the fastening assembly 2 are all arranged at the left side of the casing 1, the forward rotation is counterclockwise rotation and the reverse rotation is clockwise rotation.

[0034] Optionally, the fastening assembly 2 further comprises a first limiting column 24, the first connecting rod 22 is provided with a limiting block 222 at one end away from the first abutting piece 23, the first limiting column 24 is arranged on the rotating path of the limiting block 222 and is adapted to abut against the limiting block 222, and the first limiting column 24 is adapted to abut against the positioning part 221.

[0035] As shown in Figure 2 In the present embodiment, the limiting block 222 is located at one side close to the cutting cavity 11.

[0036] Optionally, the rotating disc 4 is further arranged, the rotating disc 4 is provided with a fixing seat 42, the fixing seat 42 is provided with a first mounting column 421 and a mounting hole 422, the first mounting column 421 is rotationally connected with the first connecting rod 22, the first mounting column 421 is sleeved with a second torsional spring 43, one end of the torsional spring 43 is inserted into the mounting hole 422, and the other end of the second torsional spring 43 abuts against one side of the first connecting rod 22 away from the cutting cavity 11, so as to limit the rotation angle of the first connecting rod 22.

[0037] As shown in Figure 2 In the present embodiment, when the fastening assembly 2 is located at the initial position, because the rotating disc 4 is position-locked, the positioning part 221 is limited between the first limiting column 24 and the positioning block 13, and at this time, the second torsional spring 43 is in a compressed state. When the rotating disc 4 starts to rotate clockwise, the positioning part 221 rotates around the cutting cavity 11 together with the rotating disc 4 and away from the positioning block 13, and at this time, the second torsional spring 43 drives the first connecting rod 22 to rotate away from the positioning block 13 until the limiting block 222 abuts against the first limiting column 24.

[0038] When the rotating disc 4 rotates one circle, the positioning part 221 slides through the guide part 131 and drives the positioning block 13 to rotate counterclockwise at a small amplitude through the guide part 131, and when the positioning part 221 passes through the positioning block 13, the positioning block 13 rebounds to the original position under the action of the first torsional spring 14.

[0039] Then the rotating disc 4 rotates counterclockwise, so that the positioning part 221 abuts against the end of the positioning block 13 again, and when the rotating disc 4 is position-locked, the positioning part 221 is again limited between the positioning block 13 and the first limiting column 24.

[0040] Optionally, one end of the first abutting piece 23 is provided with a connecting part 231, one end of the first connecting rod 22 away from the connecting part 231 is provided with a connecting hole 223, and the two ends of the pull spring 21 are hooked to the connecting part 231 and the connecting hole 223.

[0041] As shown in the drawings, in the embodiment, the connecting part 231 is arranged at one end of the first abutting piece 23 close to the first limiting column 24. Figure 2

[0042] Optionally, the cutting assembly 3 is further provided, the cutting assembly 3 is rotationally connected with the cutting cavity 11, the cutting assembly 3 comprises a cutter 31, a second connecting rod 32, a third torsional spring 33 and a second limiting column 34, one end of the second connecting rod 32 is fixedly connected with the cutter 31, the second connecting rod 32 is provided with a second mounting column 35, the third torsional spring 33 is sleeved on the second mounting column 35, and the two ends of the third torsional spring 33 are respectively abutted against the second limiting column 34 and the second connecting rod 32, so that the cutter 31 can be pressed against the surface of the tree trunk.

[0043] As shown in the drawings, in the embodiment, the cutting assembly 3 and the fastening assembly 2 are respectively fixed on the left and right sides of the rotating disc 4, when the rotating disc 4 rotates, the cutting assembly 3 and the fastening assembly 2 rotate together, so that the cutter 31 and the first abutting piece 23 can girdle the tree trunk in the rotating process, and the girdling process can always keep a stable clamping effect, so that the position of the tree trunk is stable. Figure 3

[0044] In the girdling process, because the surface of the tree trunk is uneven, the cutter 31 will be given a radial outward repulsive force, the elastic force of the third torsional spring 33 can resist the repulsive force brought by the tree trunk, so that the cutter 31 can always be pressed against the surface of the tree trunk, and the girdling effect is more stable.

[0045] Optionally, the cutting assembly 3 further comprises a second abutting piece 36 and a connecting seat 37, the second abutting piece 36 is suitable for abutting against the tree trunk in the cutting cavity 11, the connecting seat 37 is fixedly connected with the second connecting rod 32 and the second abutting piece 36, the cutter 31 is fixed on the connecting seat 37, and the second abutting piece 36 cooperates with the first abutting piece 23 to clamp the tree trunk in the cutting cavity 11.

[0046] As shown in the drawings, in the embodiment, the second abutting piece 36 is arc-shaped, the cutter 31 is arranged above the second abutting piece 36, the second abutting piece 36 cooperates with the first abutting piece 23 to clamp the tree trunk from both ends of the cutting cavity 11, and further cooperates with the cutter 31 to always keep a stable clamping effect on the tree, so that the cutting effect under complex cutting conditions is effectively improved. Figure 3

[0047] ​​​Optionally, the cutting assembly 3 further comprises a third connecting rod 38, two ends of the third connecting rod 38 are fixedly connected with the second mounting column 35 and the connecting seat 37 respectively, and two ends of the third torsional spring 33 abut against the second limiting column 34 and the side wall of the connecting seat 37 respectively.

[0048] As shown in the drawings, Figure 3 In the embodiment, the third connecting rod 38 abuts against the cutter 31, so that the connecting structure is more stable.

[0049] When the fruit tree girdling machine is used, the tree enters the cutting cavity 11 through the tree clamping opening 41, the user abuts the cutter 31 against the surface of the tree, and then starts the equipment, at this time, the rotating disc 4 drives the cutting assembly 3 and the fastening assembly 2 to rotate around the cutting cavity 11, the cutter 31 gradually cuts into the bark along with the rotation, and when a circle is rotated, the bark is peeled off, so that the girdling operation of the tree is completed.

[0050] Since the fastening assembly 2 and the cutting assembly 3 are arranged left and right relative to the cutting cavity 11, the tree is limited in a certain range of movement under the joint action of the two, so that the stability of the equipment during cutting is improved; secondly, the first connecting rod 22 and the first abutting piece 23 in the fastening assembly 2 can be connected by rotation, and abut against the surface of the tree together, so that the uneven surface of the tree is better fitted, and the abutting effect is further improved; further, when the cutting depth of the cutting assembly 3 changes (such as increases or decreases) during the girdling process, the first connecting rod 22 drives the first abutting piece 23 to adjust the position along the surface of the tree, so that the clamping radius is dynamically changed. It is ensured that the fastening assembly 2 can adapt to the change of the cutting depth in real time, and cooperate with the cutter assembly 3 to always maintain the stable clamping effect on the tree, effectively improve the cutting effect under complex cutting conditions.

[0051] Another embodiment of the utility model provides a fruit tree girdling machine, which comprises the fastening mechanism as described above.

[0052] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A fastening mechanism, characterized by, The utility model provides a cutting device for tree trunk, which comprises a casing (1) and a fastening assembly (2), the casing (1) is provided with a cutting cavity (11) suitable for placing a tree trunk, the fastening assembly (2) is rotationally connected with the cutting cavity (11), the fastening assembly (2) comprises a pull spring (21), a first connecting rod (22) and a first abutting piece (23) which are circumferentially distributed outside the cutting cavity (11), the first connecting rod (22) and the first abutting piece (23) are rotationally connected, the first abutting piece (23) is suitable for abutting against the tree trunk in the cutting cavity (11), and the two ends of the pull spring (21) are connected with the first connecting rod (22) and the first abutting piece (23) simultaneously, when starting to work, the first connecting rod (22) rotates and drives the first abutting piece (23) to enter the cutting cavity (11) to abut against the tree trunk, and the pull spring (21) provides an inward pulling force for the first abutting piece (23) to make the first abutting piece (23) abut tightly against the tree trunk, so that the tree trunk is kept in a stable position in the cutting cavity (11).

2. The fastening mechanism of claim 1, wherein, The utility model further comprises a rotating disc (4) provided with a tree clamping opening (41) communicating with the cutting cavity (11), the tree trunk enters the cutting cavity (11) through the tree clamping opening (41), the rotating disc (4) is rotationally connected with the casing (1), and the fastening assembly (2) is connected with the rotating disc (4) and rotates around the cutting cavity (11) together with the rotating disc (4).

3. The fastening mechanism of claim 1, wherein, The casing (1) is provided with a positioning seat (12), the positioning seat (12) is rotationally connected with a positioning block (13), a first torsional spring (14) is connected between the positioning seat (12) and the positioning block (13), the two ends of the first torsional spring (14) are respectively abutted against the positioning seat (12) and the positioning block (13), one end of the first connecting rod (22) away from the first abutting piece (23) is provided with a positioning portion (221), the positioning portion (221) is suitable for abutting against the positioning block (13), and the positioning block (13) is limited on the reverse rotation path of the positioning portion (221), when the positioning portion (221) abuts against the positioning block (13), the fastening assembly (2) is located at an initial position, when the first connecting rod (22) rotates forward around the cutting cavity (11), the positioning portion (221) is separated from the positioning block (13), so that the first connecting rod (22) can drive the first abutting piece (23) to enter the cutting cavity (11) to abut tightly against the tree trunk.

4. The fastening mechanism of claim 3, wherein, The positioning block (13) is provided with an arc-shaped guide portion (131) on one side close to the cutting cavity (11), the side wall of the positioning portion (221) is arc-shaped, and the guide portion (131) is in sliding connection with the positioning portion (221); when the fastening assembly (2) is located at the initial position, one end of the positioning block (13) abuts against the positioning portion (221) to limit reverse rotation of the positioning portion (221); when the first connecting rod (22) rotates one circle in the positive direction around the cutting cavity (11), the positioning portion (221) slides through the guide portion (131) to push the positioning block (13) to rotate and avoid, so that the positioning portion (221) can return to the initial position.

5. The fastening mechanism of claim 3, wherein, The fastening assembly (2) further comprises a first limiting column (24), one end of the first connecting rod (22) away from the first abutting piece (23) is provided with a limiting block (222), and the first limiting column (24) is arranged on the rotating path of the limiting block (222) and abuts against the limiting block (222). The first limiting column (24) abuts against the positioning portion (221).

6. The fastening mechanism of claim 1, wherein, Further comprising a rotating disc (4), the rotating disc (4) is provided with a fixed seat (42), the fixed seat (42) is provided with a first mounting column (421) and a mounting hole (422), the first mounting column (421) is in rotating connection with the first connecting rod (22), a second torsional spring (43) is sleeved on the first mounting column (421), one end of the torsional arm of the second torsional spring (43) is inserted into the mounting hole (422), and the other end of the torsional arm of the second torsional spring (43) abuts against one side of the first connecting rod (22) away from the cutting cavity (11), so as to limit the rotation angle of the first connecting rod (22).

7. The fastening mechanism of claim 1, wherein, One end of the first abutting piece (23) is provided with a connecting portion (231), one end of the first connecting rod (22) away from the connecting portion (231) is provided with a connecting hole (223), and the two ends of the tension spring (21) are hooked with the connecting portion (231) and the connecting hole (223) at the same time.

8. The fastening mechanism of any of claims 1-7, wherein, Further comprising a cutting assembly (3), the cutting assembly (3) and the cutting cavity (11) are in rotating connection, the cutting assembly (3) comprises a cutter (31), a second connecting rod (32), a third torsional spring (33) and a second limiting column (34), one end of the second connecting rod (32) is fixedly connected with the cutter (31), the second connecting rod (32) is provided with a second mounting column (35), the third torsional spring (33) is sleeved on the second mounting column (35), and the two ends of the torsional arm of the third torsional spring (33) abut against the second limiting column (34) and the second connecting rod (32) respectively, so that the cutter (31) can be pressed against the surface of the tree trunk.

9. The fastening mechanism of claim 8, wherein, The cutting assembly (3) further comprises a second abutting piece (36) adapted to abut against the trunk inside the cutting cavity (11) and a connecting seat (37) fixedly connecting the second connecting rod (32) and the second abutting piece (36) at the same time, the cutting knife (31) being fixed on the connecting seat (37), the second abutting piece (36) and the first abutting piece (23) being matched to clamp the trunk in the cutting cavity (11).

10. A fruit tree girdling machine characterized by comprising: A fastening mechanism as claimed in any one of claims 1 to 9. A fastening mechanism as claimed in any one of claims 1 to 9.

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