Universal grafting machine with cutter convenient to replace

By designing a grafting machine that facilitates tool replacement and employing locking and stabilizing components, the problem of tool loosening in grafting machines has been solved, achieving stable tool locking and efficient tool replacement, thus improving the accuracy and safety of grafting work.

CN121153484AInactive Publication Date: 2025-12-19WEIFANG UNIVERSITY
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Patent Information

Application Number
CN202511704639.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-20
Publication Date
2025-12-19
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In existing grafting machines, the blades are loose or not secure, which affects the working accuracy and may fall off. The operation is complicated and inefficient.

Method used

A universal grafting machine with easy tool replacement was designed. The tool replacement mechanism enables quick clamping and stable holding, including a clamping component, a stabilizing component, and an auxiliary component, to ensure the stability and convenient replacement of the tool during the insertion process.

Benefits of technology

It improves the stability and replacement efficiency of the cutting tools, prevents the tools from tilting or loosening, and ensures the accuracy and safety of grafting operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention belongs to the technical field of grafting machines, and discloses a universal grafting machine convenient for cutter replacement, which comprises an air pump seat, one side of the air pump seat is fixedly connected with an air pump, the output end of the air pump is communicated with a moving rod piece, one end of the moving rod piece is fixedly connected with a loading shell, and the universal grafting machine further comprises a cutter replacement mechanism, the cutter replacing mechanism comprises a square box fixedly connected to one end of the inner wall of the loading shell, a supporting plate is fixedly connected to the bottom of the loading shell, a worker obliquely inserts and clamps a blade to a clamping rod, the blade is preliminarily and rapidly inserted, the blade downwards presses an elastic sliding frame, the elastic sliding frame downwards slides in a special-shaped rotating shell, and the cutter replacing mechanism is used for replacing the cutter in the special-shaped rotating shell. The blade, the clamping rod and the special-shaped rotating shell are rotated, so that the special-shaped rotating shell and the sliding rod are located on the same plane, when the special-shaped rotating shell and the sliding rod are perpendicularly arranged, large force can be applied in the oblique insertion process in the blade oblique insertion process, and the blade and the clamping rod are clamped more stably.
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Description

Technical Field

[0001] This invention belongs to the field of grafting machine technology, specifically a universal grafting machine that is easy to replace blades. Background Technology

[0002] Grafting technology is widely used in actual seedling production. The existing grafting method usually involves cutting the rootstock and scion, aligning the cut edges of the finished seedling and scion, and then using a grafting clip to wrap the joint between the finished seedling and scion to achieve grafting. Although grafting propagation requires the cultivation of rootstock first and is relatively complicated in terms of operation, it can utilize the physiological influence of the rootstock on the scion to enhance the plant's disease resistance, improve the plant's low-temperature tolerance, help overcome the damage caused by continuous cropping, expand the root system's absorption range and capacity, and even improve quality, resulting in a bumper harvest. It has significant advantages and is therefore a commonly used vegetative propagation method.

[0003] The tools used in current grafting machines are generally grafting blades. Currently, grafting machines require threaded installation of grafting blades, which is relatively complex and inefficient. There is also a quick clamping method for grafting blades, which usually requires the grafting blade to be inserted at an angle. If the blade is not properly aligned during this process, it may become loose or unstable. This will not only affect the working accuracy, but may also cause the blade to fall off or tilt during use. Summary of the Invention

[0004] To address the problem mentioned in the background art that the cutting tools may become loose and not accurately align, this invention provides a universal grafting machine that facilitates tool replacement.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a universal grafting machine that facilitates tool replacement, comprising an air pump base, an air pump fixedly connected to one side of the air pump base, a movable rod connected to the output end of the air pump, a loading shell fixedly connected to one end of the movable rod, and a tool replacement mechanism, comprising a square box fixedly connected to one end of the inner wall of the loading shell, a tray fixedly connected to the bottom of the loading shell, a sliding rod slidably connected to one side of the square box, and a locking component provided at one end of the sliding rod for quick locking of the tool.

[0006] Preferably, the positioning assembly includes a square plate fixedly connected to one end of the sliding rod, the outer wall of the square plate being slidably connected to the inner wall of the square box, and a compression spring being fixedly connected to one side of the square plate.

[0007] Preferably, one end of the compression spring is fixedly connected to one side of the inner wall of the square box, one end of the sliding rod is hinged to an irregularly shaped rotating shell, and an elastic slide is slidably connected to the inner wall of the irregularly shaped rotating shell.

[0008] Preferably, a locking rod is fixedly connected to the top of the irregularly shaped rotating shell, the outer wall of the locking rod contacts a blade, and the bottom of the blade contacts the top of the elastic slide.

[0009] Preferably, the outer wall of the sliding rod is provided with a stabilizing component, the stabilizing component including a toothed plate fixedly connected to the top and bottom of the sliding rod, and a gear being meshed with the outer wall of one end of the toothed plate.

[0010] Preferably, a round rod is rotatably connected to the inner wall of the gear, both ends of the round rod are fixedly connected to the inner wall of the loading shell, and lead screws are fixedly connected to both sides of the gear, with a threaded plate threaded to the outer wall of one end of the lead screw.

[0011] Preferably, a connecting plate is fixedly connected to one side of the threaded plate, and the side of the threaded plate away from the connecting plate is slidably connected to the outer wall of the square box. A strip-shaped hole is provided on one side of the connecting plate.

[0012] Preferably, a rotating bar is hinged to both ends of one side of the connecting plate, a clamping plate is hinged to one end of the rotating bar, a rubber plate is fixedly connected to the side of the clamping plate away from the rotating bar, and a limit rod is fixedly connected to the side of the clamping plate close to the rotating bar. One end of the limit rod is slidably connected to the inner wall of the strip hole.

[0013] Preferably, an auxiliary component is provided on the top of the square plate, the auxiliary component including sliding frame rods fixedly connected to both sides of the top of the square plate, and square holes are provided on both sides of the top of the square box.

[0014] Preferably, one end of the sliding frame rod is slidably connected to the inner wall of the square hole, and both ends of the top of the loading shell are fixedly connected to a fixing rod. The top outer wall of the fixing rod is rotatably connected to a shaped card plate, and a tension spring is fixedly connected between the two shaped cards.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes a blade-changing mechanism. Workers insert the blade obliquely and engage it with the locking rod for initial, rapid blade engagement. The blade presses down on the elastic slide, causing it to slide down inside the irregularly shaped rotating housing. Rotating the blade, locking rod, and rotating housing aligns the housing and sliding rod on the same plane. When the rotating housing and sliding rod are perpendicular, a greater force is applied during the oblique blade insertion, resulting in a more stable engagement between the blade and locking rod. Subsequently, the blade slides against the sliding rod, which moves the toothed plate. During this movement, the toothed plate contacts a gear, causing it to rotate. The gear then rotates the lead screw, which in turn moves a threaded plate along the side wall of the square box. The threaded plate moves the connecting plate and rotating bar, which in turn moves the clamping plate and rubber plate. As the two rubber plates move closer together, they clamp the top and bottom of the blade, effectively preventing the blade from tilting after engagement. Maintaining the blade at a horizontal or specified angle is crucial for precise vegetable processing.

[0016] This invention, through the design of a tool changing mechanism, allows the sliding rod to move as it moves into the square box. The sliding rod then moves the square plate, which in turn moves the sliding support rod. At this point, the two sets of rubber plates clamp the blade, pushing the sliding support rod forward. The sliding support rod then moves the initially clamped blade towards the square box, preventing workers from excessively pushing the blade with their hands and causing cuts, thus improving worker safety. When the blade contacts the rubber plates, a slight pushing force is generated, causing the rubber plates to move slightly towards the square box. As the blade moves and the two sets of rubber plates continue to compress it, the reaction force from the blade causes the clamping plate to move closer to the connecting plate. Simultaneously, as the clamping plate moves towards the connecting plate, it drives the limiting rod to slide along the inner wall of the slotted hole. The clamping plate then moves towards the square box, causing the rubber plates to move as well. The two sets of rubber plates, in contact with the blade, further stabilize the blade within the clamping rod, ensuring stability during insertion and preventing tilting or loosening due to uneven force or operational errors. The linkage between the clamping plate and the rubber plates ensures the blade maintains a stable posture at all times.

[0017] This invention features a tool changing mechanism. When the sliding frame moves to its installed position, two sets of irregularly shaped clamping plates are pulled apart, causing them to move away from each other. Then, the clamping plates are released, and the elastic deformation of the tension spring causes them to move closer together. During this process, the clamping plates contact the outer wall of one end of the sliding frame, thus locking the frame and preventing it from resetting, improving the stability of the device. When the blade needs to be replaced, pulling the clamping plates releases them from the sliding frame. The elastic compression of the compression spring causes the square plate to reset. Simultaneously, without the rubber plate holding the blade, the elastic deformation of the elastic slide causes it to slide upwards inside the irregularly shaped rotating shell. The pushing force generated by the upward movement of the elastic slide compresses the blade, facilitating removal and improving the efficiency of blade replacement. Attached Figure Description

[0018] Figure 1 This is a top view of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the air pump base of the present invention; Figure 3 This is a schematic cross-sectional view of the sliding rod structure of the present invention; Figure 4 This is a schematic diagram of the side structure of the compression spring of the present invention; Figure 5 This is a top view of the rubber sheet structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of A in the middle; Figure 7 This is a schematic diagram of the side structure of the blade of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of B in the middle; Figure 9 This is a schematic cross-sectional view of the irregular rotating shell structure of the present invention.

[0019] In the diagram: 1. Air pump base; 2. Air pump; 3. Moving rod; 4. Loading shell; 5. Tool changing mechanism; 51. Square box; 52. Support plate; 53. Sliding rod; 54. Positioning assembly; 55. Stabilizing assembly; 56. Auxiliary assembly; 541. Compression spring; 542. Square plate; 544. Irregular rotating shell; 545. Elastic slide; 546. Locking rod; 547. Blade; 551. Toothed plate; 552. Gear; 553. Round rod; 554. Lead screw; 555. Threaded plate; 556. Connecting plate; 557. Strip hole; 558. Rotating bar; 559. Clamping plate; 5510. Rubber plate; 5511. Limiting rod; 561. Sliding frame rod; 562. Square hole; 563. Fixing rod; 564. Irregular locking plate; 565. Tension spring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 9 As shown, the present invention provides a universal grafting machine that facilitates tool replacement, including an air pump base 1, an air pump 2 fixedly connected to one side of the air pump base 1, a movable rod 3 connected to the output end of the air pump 2, a loading shell 4 fixedly connected to one end of the movable rod 3, and also including; The tool changing mechanism 5 includes a square box 51 fixedly connected to one end of the inner wall of the loading shell 4. A tray 52 is fixedly connected to the bottom of the loading shell 4. A sliding rod 53 is slidably connected to one side of the square box 51. A locking component 54 is provided at one end of the sliding rod 53 for quick locking of the tool.

[0022] The positioning assembly 54 includes a square plate 542 fixedly connected to one end of the sliding rod 53. The outer wall of the square plate 542 is slidably connected to the inner wall of the square box 51. A compression spring 541 is fixedly connected to one side of the square plate 542.

[0023] One end of the compression spring 541 is fixedly connected to one side of the inner wall of the square box 51, and one end of the sliding rod 53 is hinged to an irregular rotating shell 544. An elastic slide 545 is slidably connected to the inner wall of the irregular rotating shell 544.

[0024] The top of the irregular rotating shell 544 is fixedly connected to a locking rod 546. The outer wall of the locking rod 546 contacts a blade 547. The bottom of the blade 547 contacts the top of the elastic slide 545. The support plate 52 is used to lift and limit the blade 547 to prevent the blade 547 from rotating too much during quick installation, so that the blade 547 and the sliding rod 53 move laterally in the same position.

[0025] Using the above method: The operator inserts the blade 547 at an angle and engages it with the locking rod 546, completing the initial quick engagement. The blade 547 presses down on the elastic slide 545, allowing it to slide within the irregularly shaped rotating shell 544. The blade 547 and locking rod 546 are rotated to align with the irregularly shaped rotating shell 544, ensuring they are on the same plane as the sliding rod 53. When the irregularly shaped rotating shell 544 is perpendicular to the sliding rod 53, greater pressure can be applied during the angled insertion of the blade 547, ensuring a stable engagement between the blade 547 and the locking rod 546.

[0026] like Figures 1 to 9 As shown, the outer wall of the sliding rod 53 is provided with a stabilizing component 55. The stabilizing component 55 includes a toothed plate 551 fixedly connected to the top and bottom of the sliding rod 53. A gear 552 is meshed with the outer wall of one end of the toothed plate 551.

[0027] The above scheme works as follows: When the blade 547 contacts the rubber plate 5510, a slight pushing force is generated, causing the rubber plate 5510 to move slightly towards the square box 51. Simultaneously, the two sets of rubber plates 5510 continue to apply pressure to the blade 547, generating a reaction force that moves the clamping plate 559 closer to the connecting plate 556. During this process, the clamping plate 559 drives the limiting rod 5511 to slide along the inner wall of the slot 557, ultimately pushing the clamping plate 559 and the rubber plates 5510 towards the square box 51. The two sets of rubber plates 5510 are tightly fitted to the blade 547, ensuring that the blade 547 is stably engaged in the clamping rod 546, preventing the blade 547 from tilting or loosening due to operational errors or uneven force application.

[0028] A round rod 553 is rotatably connected to the inner wall of gear 552. Both ends of the round rod 553 are fixedly connected to the inner wall of the loading shell 4. Both sides of gear 552 are fixedly connected to lead screws 554. A threaded plate 555 is threadedly connected to the outer wall of one end of the lead screw 554.

[0029] A connecting plate 556 is fixedly connected to one side of the threaded plate 555, and the side of the threaded plate 555 away from the connecting plate 556 is slidably connected to the outer wall of the square box 51. A strip hole 557 is opened on one side of the connecting plate 556.

[0030] A rotating bar 558 is hinged to both ends of one side of the connecting plate 556. A clamping plate 559 is hinged to one end of the rotating bar 558. A rubber plate 5510 is fixedly connected to the side of the clamping plate 559 away from the rotating bar 558. A limit rod 5511 is fixedly connected to the side of the clamping plate 559 close to the rotating bar 558. One end of the limit rod 5511 is slidably connected to the inner wall of the strip hole 557.

[0031] The above scheme is adopted: the sliding rod 53 drives the toothed plate 551 to move, and the toothed plate 551 contacts the gear 552 during the movement, pushing the gear 552 to rotate. The gear 552 drives the lead screw 554 to rotate, which in turn drives the threaded plate 555 to slide along the side wall of the square box 51. The threaded plate 555 pushes the connecting plate 556 and the rotating bar 558 to move, and the rotating bar 558 drives the clamping plate 559 and the rubber plate 5510 to move together. As the two rubber plates 5510 approach each other, the top and bottom of the blade 547 are clamped, effectively preventing the blade 547 from tilting after insertion.

[0032] An auxiliary component 56 is provided on the top of the square plate 542. The auxiliary component 56 includes sliding frame rods 561 fixedly connected to both sides of the top of the square plate 542. Square holes 562 are provided on both sides of the top of the square box 51.

[0033] The above solution works as follows: when the sliding rod 53 moves into the square box 51, it moves the square plate 542 and the sliding frame rod 561 together. At this time, the two sets of rubber plates 5510 clamp the blade 547, and simultaneously push the sliding frame rod 561 to move, sending the initially clamped blade 547 into the square box 51. This prevents workers from being injured by manually pushing the blade 547.

[0034] One end of the sliding frame rod 561 is slidably connected to the inner wall of the square hole 562. Both ends of the top of the loading shell 4 are fixedly connected to the fixing rod 563. The top outer wall of the fixing rod 563 is rotatably connected to the irregularly shaped card plate 564. A tension spring 565 is fixedly connected between the two irregularly shaped card plates 564.

[0035] The above solution works as follows: When the sliding rod 561 moves to the installation position, the two sets of irregularly shaped clamping plates 564 are pulled apart, causing them to move away from each other. Then, the irregularly shaped clamping plates 564 are released, and the elastic recovery of the tension spring 565 causes the two sets of clamping plates 564 to move closer together. During this process, the clamping plates 564 contact the outer wall of one end of the sliding rod 561, thereby locking the sliding rod 561 in place, preventing it from resetting, and improving the stability of the device.

[0036] Working principle and usage process of this invention: The operator inserts the blade 547 at an angle and engages it with the locking rod 546, performing a preliminary quick insertion of the blade 547. The blade 547 presses down on the elastic slide 545, causing it to slide down inside the irregularly shaped rotating shell 544. The operator rotates the blade 547, locking rod 546, and irregularly shaped rotating shell 544 until the shell and sliding rod 53 are on the same plane. When the shell and sliding rod 53 are perpendicular, a greater force can be applied during the angled insertion of the blade 547, making the engagement between the blade 547 and locking rod 546 more stable. Then, the operator presses the blade 547 against the sliding rod 546... 3. Sliding: The sliding rod 53 drives the toothed plate 551 to move. During the movement of the toothed plate 551, it comes into contact with the gear 552, causing the gear 552 to rotate. The gear 552 drives the lead screw 554 to rotate, and the lead screw 554 drives the threaded plate 555 to slide along the side wall of the square box 51. The threaded plate 555 drives the connecting plate 556 and the rotating bar 558 to move. The rotating bar 558 drives the clamping plate 559 and the rubber plate 5510 to move. As the two rubber plates 5510 move closer to each other, they can clamp the top and bottom of the blade 547, effectively preventing the blade 547 from being tilted after insertion. Keeping the blade 547 horizontal or at a specified angle is crucial for precise vegetable processing.

[0037] When the sliding rod 53 moves into the square box 51, it drives the square plate 542 to move, which in turn drives the sliding frame rod 561 to move. At this time, the two sets of rubber plates 5510 clamp the blade 547, pushing the sliding frame rod 561 to move. The sliding frame rod 561 then moves the initially clamped blade 547 towards the square box 51, preventing workers from excessively pushing the blade 547 and causing cuts, thus improving worker protection. When the blade 547 contacts the rubber plate 5510, a slight pushing force is generated, causing the rubber plate 5510 to move slightly towards the square box 51. Simultaneously, the two sets of rubber plates 5510 continue... When the blade 547 is continuously pressed, the reaction force from the blade 547 causes the clamping plate 559 to move closer to the connecting plate 556. Simultaneously, as the clamping plate 559 moves closer to the connecting plate 556, it drives the limiting rod 5511 to slide along the inner wall of the slot 557. The clamping plate 559 then moves towards the square box 51, causing the rubber plate 5510 to move towards the square box 51. The two sets of rubber plates 5510, which are in contact with the blade 547, further stabilize the blade 547 inside the clamping rod 546, ensuring the stability of the blade 547 during insertion and preventing tilting or loosening due to uneven force or operational errors. The linkage between the clamping plate 559 and the rubber plate 5510 ensures that the blade 547 maintains a stable posture at all times.

[0038] When the sliding rod 561 moves to its installed position, the two sets of irregularly shaped clamping plates 564 are pulled apart, causing them to move away from each other. Then, the clamping plates 564 are released, and due to the elastic deformation of the tension spring 565, they move closer together. During this process, the clamping plates 564 contact the outer wall of one end of the sliding rod 561, thus locking the sliding rod 561 in place and preventing it from resetting, thereby improving the stability of the device operation. When the blade 547 needs to be replaced, the irregularly shaped clamping plates are pulled apart. Plate 564 prevents the two irregularly shaped clamping plates 564 from locking the sliding frame rod 561. Under the elastic compression of the compression spring 541, the square plate 542 is reset. At the same time, when the rubber plate 5510 is not holding the blade 547, it is subjected to the elastic deformation of the elastic slide 545. The elastic slide 545 slides upward inside the irregularly shaped rotating shell 544. The pushing force generated by the upward movement of the elastic slide 545 will squeeze the blade 547, making it easier for the operator to pull out the blade 547 and improving the work efficiency of the device to replace the blade 547.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A universal grafting machine for easy tool replacement, comprising an air pump base (1), an air pump (2) fixedly connected to one side of the air pump base (1), a movable rod (3) connected to the output end of the air pump (2), and a loading shell (4) fixedly connected to one end of the movable rod (3), characterized in that: Also includes; The tool changing mechanism (5) includes a square box (51) fixedly connected to one end of the inner wall of the loading shell (4), the bottom of the loading shell (4) is fixedly connected with a supporting plate (52), one side of the square box (51) is slidably connected with a sliding rod (53), one end of the sliding rod (53) is provided with a clamping assembly (54) for quick clamping of the tool; The clamping assembly (54) includes a square plate (542) fixedly connected to one end of the sliding rod (53), the outer wall of the square plate (542) is slidably connected to the inner wall of the square box (51), one side of the square plate (542) is fixedly connected with an extrusion spring (541); One end of the extrusion spring (541) is fixedly connected to one side of the inner wall of the square box (51), one end of the sliding rod (53) is hingedly connected with a special-shaped rotating shell (544), the inner wall of the special-shaped rotating shell (544) is slidably connected with an elastic slide (545); The top of the special-shaped rotating shell (544) is fixedly connected with a clamping rod (546), the outer wall of the clamping rod (546) is in contact with a blade (547), the bottom of the blade (547) is in contact with the top of the elastic slide (545).

2. The universal grafting machine with easy tool change according to claim 1, characterized in that: The outer wall of the sliding rod (53) is provided with a stabilizing assembly (55), the stabilizing assembly (55) includes a toothed plate (551) fixedly connected to the top and bottom of the sliding rod (53), one end of the toothed plate (551) is meshingly connected with a gear (552).

3. The universal grafting machine with easy tool change according to claim 2, characterized in that: The inner wall of the gear (552) is rotatably connected with a round rod (553), both ends of the round rod (553) are fixedly connected to the inner wall of the loading shell (4), both sides of the gear (552) are fixedly connected with a lead screw (554), one end of the lead screw (554) is threadedly connected with a threaded plate (555).

4. The universal grafting machine with easy tool change according to claim 3, characterized in that: One side of the threaded plate (555) is fixedly connected with a connecting plate (556), the side of the threaded plate (555) away from the connecting plate (556) is slidably connected to the outer wall of the square box (51), one side of the connecting plate (556) is provided with a strip-shaped hole (557).

5. The universal grafting machine with easy tool change according to claim 4, characterized in that: One side of the connecting plate (556) is hingedly connected with a rotating strip (558) at both ends, one end of the rotating strip (558) is hingedly connected with a clamping plate (559), the side of the clamping plate (559) away from the rotating strip (558) is fixedly connected with a rubber plate (5510), the side of the clamping plate (559) close to the rotating strip (558) is fixedly connected with a limiting rod (5511), one end of the limiting rod (5511) is slidably connected to the inner wall of the strip-shaped hole (557).

6. The universal grafting machine with easy tool change according to claim 5, characterized in that: The top of the square plate (542) is provided with an auxiliary assembly (56), the auxiliary assembly (56) includes sliding frame rods (561) fixedly connected to the top of both sides of the square plate (542), the top of both sides of the square box (51) is provided with a square hole (562).

7. The universal grafting machine with easy change of knives according to claim 6, characterized in that: One end outer wall of the sliding frame rod (561) is connected in the inner wall of the square hole (562), both ends of the top of the loading shell (4) are fixedly connected with the fixed rod (563), the top end outer wall of the fixed rod (563) is rotatably connected with the special-shaped clamping plate (564), and the two special-shaped clamping plates (564) are fixedly connected with the tension spring (565).