Hedge trimmer with quick-change blades

Abstract

The present invention relates to the technical field of hedge trimmers, and in particular to a hedge trimmer with quick-change blades; the hedge trimmer comprises a driving device, a speed changing device, a quick-changing device and a blade; the output end of the driving device is provided with a speed changing device, and the speed changing device is connected to the blade via a quick-changing device; when the blade needs to be replaced, the blade can be quickly replaced by adjusting the quick-changing device; when the blade needs to be replaced, the hedge trimmer provided by the present invention can quickly disassemble the blade and replace it with a new blade by adjusting the quick-changing device; at the same time, the present invention provides a variety of ways to quickly replace the blade, further improving the efficiency of replacing the blade and the stability of later use.

Description

Technical Field

[0001] The invention relates to the technical field of hedge trimmers, and in particular to a hedge trimmer with quick-change blades. Background Art

[0002] Pruning shears are commonly used tools in gardening operations. Pruning shears often cut hard metals during operation, which can easily damage the blade assembly and require replacement of the blade assembly. When replacing the blade assembly of existing pruning shears, the eccentric wheel of the hedge trimmer transmission device and the eccentric groove fasteners of the blade assembly need to be disassembled one by one before the eccentric wheel can be separated from the eccentric groove, thereby achieving disassembly and installation of the blade assembly. Adjusting the eccentric wheel and the eccentric groove to a detachable state is rather cumbersome, which reduces the efficiency of disassembly and assembly of the blade assembly.

[0003] At the same time, the existing hedge trimmers can only trim small branches, and cannot be used for branches that are too large or too thick.

[0004] The present invention aims to solve the problem of low replacement efficiency of blade assemblies, and for this purpose provides a hedge trimmer with quick-change blade strips, which can improve the replacement efficiency of blade assemblies. Summary of the invention

[0005] Technical issues solved:

[0006] In view of the deficiencies in the prior art, the present invention provides a hedge trimmer with quick-change blades, thereby solving the technical problems mentioned in the background technology.

[0007] Technical solution:

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A hedge trimmer with quick-change blades comprises a driving device, a speed changing device, a quick-changing device and a blade; the output end of the driving device is provided with a speed changing device, and the speed changing device is connected to the blade via the quick-changing device; when the blade needs to be replaced, the blade can be quickly replaced by adjusting the quick-changing device; the speed changing device comprises a housing, and the speed changing device has a main shaft which is rotatably connected to the output end of the driving device; an eccentric wheel 1 and an eccentric wheel 2 are fixedly provided on the main shaft near the output end; the eccentric wheel 1 and the eccentric wheel 2 are arranged opposite to each other; the eccentric wheel 1 and the eccentric wheel 2 are both transmission-connected to the blade via the quick-changing device; a cross groove 1 is provided on the output end of the main shaft.

[0010] In a possible implementation, a protective plate is provided on one side of the housing close to the blade to prevent splashing caused by the blade shearing branches.

[0011] In a possible implementation, the quick-change device includes a protective shell, a driving plate 1 and a driving plate 2; one end of the protective shell is fixedly connected to the outer shell of the speed change device; the other end is provided with a driving plate 1 and a driving plate 2; the protective shell is provided with an adjustment hole near the spindle output end; a clearance hole 1 is provided on one side of the protective shell near the blade, and a cover is threadedly connected to the clearance hole 1;

[0012] The drive sheet 1 and the drive sheet 2 have the same structure. The drive sheet 1 is provided with a mounting hole 1 on one side and a connecting portion 1 on the other side. The connecting portion 1 is provided with a mounting groove 1 on one side close to the drive sheet 2, and a threaded hole 1 is provided on one side wall of the mounting groove.

[0013] A second mounting hole is provided on one side of the driving plate 2, and a second connecting portion is provided on the other side; a second mounting groove is provided on the side of the connecting portion 2 close to the driving plate 1, and a light hole is provided on the side wall of the second mounting groove; the first mounting hole and the second mounting hole are respectively connected to the main shaft and the outer side of the eccentric wheel 1 for rotation through bearings.

[0014] In a possible implementation, the strip knife includes a knife seat, a blade 1 and a blade 2; the blade 1 and the blade 2 are arranged side by side and connected to the knife seat through a connecting assembly; a long gasket is arranged between the knife seat and the blade 1; a mounting head 1 is arranged at one end of the blade 1 close to the quick-change device, and a light hole 2 is opened inside the mounting head 1; a waist-shaped slide groove 1 is arranged at a distance from the side of the blade 1 away from the mounting head 1;

[0015] The second blade is provided with a second mounting head at one end close to the quick-change device, and a second threaded hole is provided inside the second mounting head; a second waist-shaped slide groove is provided at a distance from the second mounting head on the side of the second blade; and a second clearance hole is provided at the second end of the waist-shaped slide groove on the side close to the quick-change device;

[0016] The plurality of connecting components respectively penetrate through the waist-shaped slide groove 2 on the second blade, the waist-shaped slide groove 1 on the first blade, and the through hole on the long gasket and are fixedly connected to the blade holder;

[0017] The mounting head 1 cooperates with the mounting groove 1 on the driving plate 1 and is fastened and fixed by means of screw 1;

[0018] The second mounting head cooperates with the second mounting groove on the second driving plate and is fastened and fixed by the second screw;

[0019] The setting position of the clearance hole 1 is aligned with the maximum outward movement stroke of the threaded hole 1 on the driving plate 1; and the blade 1 is provided with a saw blade.

[0020] In a possible implementation, the blade replacement step is:

[0021] Step 1: When the hedge trimmer provided by the present invention needs to install a blade, first, manually rotate the cover to remove the cover from the inside of the first clearance hole; then insert the installation end of the blade along the installation opening of the blade reserved between the protective shell and the protective plate; at this time, the installation head 1 and the installation head 2 on the blade will automatically match with the installation groove 1 and the installation groove 2 respectively;

[0022] Step 2: Use a screwdriver to cooperate with cross slot 1 to rotate the spindle; adjust drive plate 1 and drive plate 2 to Figure 4 Position, that is, driving plate 1 moves to the rightmost stroke, and driving plate 2 moves to the leftmost stroke;

[0023] Step 3: Since the countersunk diameters of screws 1 and 2 are smaller than the diameters of clearance holes 1 and 2, when drive plate 1 is at the rightmost stroke and drive plate 2 moves to the leftmost stroke, threaded hole 1 is in line with clearance holes 2 and 1. In this way, screw 1 is passed through clearance holes 1 and 2 by a screwdriver, screw 1 is tightened by a screwdriver, and mounting head 1 is connected and matched with mounting slot 1.

[0024] Step 4: Use a screwdriver to rotate the main shaft 180 degrees; at this time, the drive plate 2 is located at the rightmost end, and the drive plate 1 is located at the leftmost end of the stroke; at this time, the light hole 1 on the right end of the drive plate 2 is in line with the clearance hole 1; use a screwdriver to pass the screw 2 through the clearance hole 1, tighten the screw 2 with the screwdriver, and connect the mounting head 2 with the mounting slot 2; in this way, the quick-change device can be connected and fixed to the blade;

[0025] Step 5: Finally, rotate the cover again to assemble it into the first hole to complete the installation of the blade.

[0026] Step 6: When the installed strip knife needs to be disassembled and replaced, the process of steps 1 to 5 is carried out in reverse order; in this way, the strip knife can be disassembled.

[0027] Beneficial effects:

[0028] 1. When the blade of the hedge trimmer provided by the present invention needs to be replaced, the blade can be quickly disassembled and replaced with a new blade by adjusting the quick-change device; at the same time, the present invention provides a variety of ways to quickly replace the blade, one of which is to pass screw one through the clearance hole one and the clearance hole two by a screwdriver, tighten screw one by a screwdriver, and connect and cooperate mounting head one with mounting slot one; then rotate the main shaft one hundred and eighty degrees by a screwdriver; at this time, the drive plate two is located at the rightmost end, and the drive plate one is located at the leftmost end of the stroke; at this time, the light hole one on the right end of the drive plate two is in line with the clearance hole one; pass screw two through the clearance hole one by a screwdriver, tighten screw two by a screwdriver, and connect and cooperate mounting head two with mounting slot two; thus, the replacement, connection and fixation of the blade by the quick-change device is realized; further, the present invention improves the quick-change device on the above basis, so that while further improving the replacement efficiency, it can also prevent the problem that the fixing device is easy to detach due to the vibration generated when the hedge trimmer is operating at high speed and high stress;

[0029] 2. The different replacement methods provided by the present invention can meet the needs of some low-speed hedge trimmers and the needs of high-speed special hedge trimmers for quick blade replacement;

[0030] 3. A saw blade is arranged on the blade 1 of the present invention. When the blade 1 reciprocates under the action of the driving device, the saw blade also reciprocates. At this time, the operator can use the saw blade to saw thicker branches; this prevents the tool from being unable to cut or the tool teeth from being easily broken due to the branch diameter being too large. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0032] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0034] Figure 3 It is a schematic diagram of the protective shell structure of the present invention;

[0035] Figure 4 It is a schematic diagram of the connection between the speed change device and the quick change device of the present invention;

[0036] Figure 5 It is an exploded view of the quick-change device structure of the present invention;

[0037] Figure 6 For the present invention Figure 5 A partial enlarged schematic diagram;

[0038] Figure 7 It is a structural schematic diagram of a driving plate of the present invention;

[0039] Figure 8 It is a structural schematic diagram of the second driving plate of the present invention;

[0040] Fig. 9 It is a schematic diagram of a strip knife of the present invention;

[0041] Fig.10 It is a schematic diagram of the explosion of the blade of the present invention;

[0042] Fig.11 It is a structural schematic diagram of a fastening device of the present invention;

[0043] Fig.12 It is a structural schematic diagram of a fastener of the present invention;

[0044] Fig.13 The second structure of the fastener of the present invention is shown in FIG. Figure 1 ;

[0045] Fig.14 It is a schematic diagram of a mounting end portion of a blade of the present invention;

[0046] Fig.15 For the present invention Fig.14 The enlarged schematic diagram at A in the middle;

[0047] Fig.16 It is a structural schematic diagram of the second fastening device of the present invention;

[0048] Fig.17 It is a schematic diagram of the third structure of the fastener of the present invention;

[0049] Fig.18 It is a schematic diagram of the three upper ends of the fastener of the present invention;

[0050] Fig.19 It is a schematic diagram of the assembly of the fastener 4 of the present invention;

[0051] Fig. 20 It is a schematic diagram of the interior of the fastener 4 of the present invention;

[0052] Fig.21 It is a schematic diagram of the abutment of the first limiting plate and the second limiting plate of the present invention;

[0053] Fig. 22 It is a schematic diagram of the second yielding slide groove on the protective plate of the present invention.

[0054] Legend: 1. Driving device; 2. Speed ​​change device; 21. Protective plate; 211. Second clearance slot; 22. Main shaft; 221. Cross slot one; 23. Eccentric wheel one; 24. Second eccentric wheel; 3. Quick change device; 31. Protective shell; 311. Adjustment hole; 312. First clearance hole; 313. Cover; 32. Driving plate one; 321. Mounting hole one; 322. Connecting part one; 323. Mounting slot one; 32 4. Threaded hole 1; 33. Drive plate 2; 331. Mounting hole 2; 332. Connecting part 2; 333. Mounting slot 2; 334. Light hole 1; 34. Screw 1; 35. Screw 2; 36. Fastening device 1; 361. Fastener 1; 3611. Cross groove 2; 3612. Threaded part 1; 3613. Assembly protrusion; 3614. Stop pin 1; 362. Fastener 2; 3621. Slot 1; 3 622, threaded portion 2; 3623, stop pin 2; 37, fastening device 2; 371, fastener 3; 3711, threaded portion 3; 3712, cross slot 3; 3713, rectangular slot 1; 3714, stop plate 1; 3715, notch; 3716, abutment rod; 372, fastener 4; 3721, threaded portion 4; 3722, rectangular slot 2; 3723, slot 2; 3724, rectangular slot 3 ; 3725, limit plate two; 3726, limit short plate; 4, strip knife; 41, knife seat; 411, long gasket; 42, blade one; 421, mounting head one; 422, light hole two; 423, waist-shaped slide groove one; 424, saw blade; 425, give way slide groove one; 43, blade two; 431, mounting head two; 432, threaded hole two; 433, waist-shaped slide groove two; 434, give way hole two; 44, connecting component. DETAILED DESCRIPTION

[0055] The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can be implemented in various forms, so the present invention is not limited to the embodiments described below. In addition, in order to more clearly describe the present invention, components that are not connected with the invention will be omitted from the drawings.

[0056] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0057] Embodiment 1:

[0058] like Figure 1-6As shown, this embodiment introduces a specific structure of a hedge trimmer with a quick-change blade, including a driving device 1, a speed change device 2, a quick change device 3 and a blade 4; the driving device 1 is used to drive the hedge trimmer to operate, and the driving device 1 is generally a gasoline engine; the output end of the driving device 1 is provided with a speed change device 2, and the speed change device 2 is connected to the blade 4 through the quick change device 3; when the blade 4 needs to be replaced, the blade 4 can be quickly replaced by adjusting the quick change device 3; the speed change device 2 includes a housing, and a side of the housing close to the blade 4 has a protective plate 21, which is used to The main shaft 22 of the speed change device 2 is rotatably connected to the output end of the driving device 1; the main shaft 22 is fixedly provided with an eccentric wheel 23 and an eccentric wheel 24 near the output end; the eccentric wheel 23 and the eccentric wheel 24 are arranged opposite to each other; the eccentric wheel 23 and the eccentric wheel 24 are both connected to the blade 4 through the quick change device 3; the output end of the main shaft 22 is provided with a cross groove 221; when the main shaft 22 needs to be manually adjusted and rotated, a screwdriver is used to cooperate with the cross groove 221, and the rotation of the main shaft 22 is realized;

[0059] like Figure 5-8 As shown, the quick-change device 3 includes a protective shell 31, a driving plate 1 32 and a driving plate 2 33; one end of the protective shell 31 is fixedly connected to the outer shell of the speed change device 2; the other end is provided with a driving plate 1 32 and a driving plate 2 33; the protective shell 31 is provided with an adjustment hole 311 near the output end of the main shaft 22; a clearance hole 1 312 is provided on one side of the protective shell 31 near the strip knife 4, and a cover 313 is threadedly connected to the clearance hole 1 312;

[0060] The driving piece 1 32 and the driving piece 2 33 have the same structure. The driving piece 1 32 has a mounting hole 1 321 on one side and a connecting portion 1 322 on the other side. The connecting portion 1 322 has a mounting groove 1 323 on one side close to the driving piece 2 33, and a threaded hole 1 324 on the side wall of the mounting groove 1 323.

[0061] The second drive plate 33 has a second mounting hole 331 on one side and a second connecting portion 332 on the other side. The second connecting portion 332 has a second mounting groove 333 on one side close to the first drive plate 32, and a first light hole 334 is formed on the side wall of the second mounting groove 333.

[0062] The mounting hole 1 321 and the mounting hole 2 331 are rotatably connected to the main shaft 22 and the outer side of the eccentric wheel 1 23 through bearings respectively;

[0063] like Fig. 9 and 6As shown, the strip knife 4 includes a knife seat 41, a blade 1 42 and a blade 2 43; the blade 1 42 and the blade 2 43 are arranged side by side and connected to the knife seat 41 through a connecting assembly 44; a long gasket 411 is arranged between the knife seat 41 and the blade 1 42, and the long gasket 411 is used for the blade 1 42 to further reduce the wear of the blade 1 42 and the knife seat 41 when cutting; a mounting head 1 421 is arranged at one end of the blade 1 42 close to the quick-change device 3, and a light hole 2 422 is opened inside the mounting head 1 421; a waist-shaped slide groove 1 423 is arranged at a distance from the side of the blade 1 42 away from the mounting head 1 421;

[0064] The second blade 43 is provided with a second mounting head 431 at one end close to the quick-change device 3, and a second threaded hole 432 is provided inside the second mounting head 431; a second waist-shaped slide groove 433 is provided at a distance from the second mounting head 431 on the side of the second blade 43; and a second clearance hole 434 is provided at the end of the second waist-shaped slide groove 433 on the side close to the quick-change device 3;

[0065] The plurality of connecting components 44 respectively penetrate through the waist-shaped groove 2 433 on the blade 2 43 and the waist-shaped groove 1 423 on the blade 1 42 and the through hole on the long gasket 411 and are fixedly connected to the blade holder 41;

[0066] The mounting head 421 cooperates with the mounting groove 323 on the driving plate 32 and is fastened and fixed by a screw 34; specifically, the threaded rod on the screw 34 is threadedly connected with the threaded hole 324; the screw head of the screw 34 rotates and cooperates with the mounting head 421;

[0067] The second mounting head 431 cooperates with the second mounting groove 333 on the second driving plate 33 and is fastened and fixed by the second screw 35; specifically, the threaded rod on the second screw 35 is threadedly connected with the second mounting head 431; the screw head of the first screw 34 is rotatably matched with the first light hole 334;

[0068] The position of the clearance hole 312 is aligned with (concentric with) the maximum outward movement position of the threaded hole 324 on the driving plate 32;

[0069] The knife seat 41, the blade 1 42 and the blade 2 43 are provided with knife teeth on both sides for cutting branches;

[0070] The blade 1 42 is provided with a saw blade 424. When the blade 1 42 reciprocates under the action of the driving device 1, the saw blade 424 also reciprocates. At this time, the operator can saw the thicker branches with the saw blade 424. This prevents the tool from being unable to cut or the tool teeth from being easily broken due to the branch diameter being too large.

[0071] When the driving device 1 drives the speed change device 2 to work, the main shaft 22 rotates to drive the eccentric wheel 1 23 and the eccentric wheel 24 to rotate; under the eccentric action of the eccentric wheel 1 23 and the eccentric wheel 24, the driving plate 1 32 and the driving plate 2 33 are driven to slide back and forth; and then the blade 1 42 and the blade 2 43 are driven to reciprocate; when the blade 1 42 and the blade 2 43 reciprocate, the tool teeth thereon are displaced from each other for shearing; in this way, when the cut branch enters the two tool teeth to be sheared with each other, the branch is cut off by the shearing of the tool teeth;

[0072] The steps of replacing the blade in this embodiment are as follows:

[0073] Step 1: When the hedge trimmer provided by the present invention needs to install the blade 4, first, manually rotate the cover 313 to remove the cover 313 from the inside of the clearance hole 1 312; then insert the installation end of the blade 4 along the installation opening of the blade 4 reserved between the protective shell 31 and the protective plate 21; at this time, the installation head 1 421 and the installation head 2 431 on the blade 4 will automatically match with the installation groove 1 323 and the installation groove 2 333 respectively;

[0074] Step 2: Use a screwdriver to cooperate with the cross slot 1 221 to rotate the main shaft 22; adjust the drive plate 1 32 and the drive plate 2 33 to the position as shown in the figure. Figure 4 Position, that is, the driving plate 1 32 moves to the rightmost stroke, and the driving plate 2 33 moves to the leftmost stroke;

[0075] Step 3: Since the screw countersunk diameters of screw 1 34 and screw 2 35 are smaller than the diameters of clearance hole 1 312 and clearance hole 2 434; when drive plate 1 32 is located at the rightmost stroke and drive plate 2 33 moves to the leftmost stroke, threaded hole 1 324, clearance hole 2 434 and clearance hole 1 312 are in the same line; screw 1 34 is passed through clearance hole 1 312 and clearance hole 2 434 by a screwdriver, screw 1 34 is tightened by a screwdriver, and mounting head 1 421 is connected and matched with mounting slot 1 323;

[0076] Step 4: Use a screwdriver to rotate the main shaft 22 180 degrees; at this time, the drive plate 2 33 is located at the rightmost end, and the drive plate 1 32 is located at the leftmost end of the stroke; at this time, the light hole 1 334 on the right end of the drive plate 2 33 is in line with the clearance hole 1 312; use a screwdriver to pass the screw 2 35 through the clearance hole 1 312, and tighten the screw 2 35 with the screwdriver to connect and cooperate the mounting head 2 431 with the mounting slot 2 333; in this way, the quick-change device 3 can be replaced, connected and fixed to the blade 4;

[0077] Step 5: Finally, the cover 313 is rotated again to be assembled in the first clearance hole 312 to complete the installation of the blade 4;

[0078] Step 6: When the installed strip knife 4 needs to be disassembled and replaced, the processes of step 1 to step 5 are performed in reverse order; thus, the strip knife 4 is disassembled;

[0079] Embodiment 2:

[0080] On the basis of the first embodiment, the quick change device 3 also includes the following features, which can also realize the detachable quick installation of the blade 4;

[0081] like Figure 6 As shown, when the present invention is in normal operation and each component meets the normal load, the screw head diameter of the screw 1 34 is smaller than the screw rod diameter of the screw 2 35; the connection relationship between other components of the quick-change device 3 is the same as that of the first embodiment; because the screw head diameter of the screw 1 34 is smaller than the screw rod diameter of the screw 2 35; thus, the screw 1 34 can pass through the light hole 1 334 normally;

[0082] The setting position of the clearance hole 312 is aligned (concentric) with the middle position of the movement stroke of the threaded hole 324 on the driving plate 32;

[0083] The steps of replacing the blade in this embodiment are as follows:

[0084] Step 1: When the hedge trimmer provided by the present invention needs to install the blade 4, first, manually rotate the cover 313 to remove the cover 313 from the inside of the clearance hole 1 312; then insert the installation end of the blade 4 along the installation opening of the blade 4 reserved between the protective shell 31 and the protective plate 21; at this time, the installation head 1 421 and the installation head 2 431 on the blade 4 will automatically match with the installation groove 1 323 and the installation groove 2 333 respectively;

[0085] Step 2: Use a screwdriver to cooperate with the cross slot 1 221 to rotate the main shaft 22; adjust the drive plate 1 32 and the drive plate 2 33 to the same position. Figure 4 The vertical position of the state, that is, the driving plate 1 32 and the driving plate 2 33 are both located in the middle position of the reciprocating stroke; at this time, the threaded hole 1 324, the light hole 1 334, the light hole 2 422, and the threaded hole 2 432 are all in line with the clearance hole 1 312;

[0086] Step 3: First, use a screwdriver to sequentially pass the screw 34 through the clearance hole 312, the light hole 334, and the threaded hole 432; tighten the screw 34 with a screwdriver to connect the mounting head 421 with the mounting slot 323;

[0087] Step 4: Use a screwdriver to insert the second screw 35 through the first clearance hole 312, and tighten the second screw 35 by the screwdriver to connect and cooperate the second mounting head 431 with the second mounting groove 333; thus, the quick-change device 3 can be replaced, connected and fixed to the blade 4;

[0088] Step 5: Finally, the cover 313 is rotated again to be assembled in the first clearance hole 312 to complete the installation of the blade 4;

[0089] Step 6: When the installed strip knife 4 needs to be disassembled and replaced, the processes of step 1 to step 5 are performed in reverse order; thus, the strip knife 4 is disassembled;

[0090] Embodiment three:

[0091] like Figure 11-13 As shown, this embodiment is improved on the basis of the second embodiment; the difference between the screw 1 34 and the screw 2 35 included in the quick-change device 3 of the second embodiment is that: this embodiment is replaced by a fastening device 1 36;

[0092] At the same time, in this embodiment, a horizontally arranged chute 425 is provided on the left end of the blade 1 42 near the blade 2 43 in the embodiment 2 (refer to Fig.14 and 15 );

[0093] The fastening device 36 comprises a fastener 361 and a fastener 362; a cross groove 3611 is provided at one end of the fastener 361, and a mounting protrusion 3613 is provided at the other end; a threaded portion 3612 is provided at one end of the fastener 361 near the mounting protrusion 3613; a limit pin 3614 is provided at the thread tail of the threaded portion 3612 in the middle of the fastener 361;

[0094] The fastener 362 has a slot 3621 at one end thereof, the slot 3621 and the yielding groove 425 have the same width and depth and are matched with the threaded portion 3612; the fastener 362 has a threaded portion 3622 at one end thereof away from the slot 3621; a limiting pin 3623 is provided at the middle of the fastener 362 near the threaded tail of the threaded portion 3622;

[0095] The assembly protrusion 3613 has a certain degree of magnetism, and when the assembly protrusion 3613 and the slot 1 3621 are matched, they can be adsorbed together; the limiting pin 1 3614 and the limiting pin 2 3623 are spring-type limiting pins;

[0096] When the fastener 1 361 and the fastener 2 362 are tightened and assembled, the head of the fastener 1 361 matches the light hole 1 334; the threaded portion 1 3612 matches the threaded hole 2 432; and the stop pin 1 3614 is stuck in the groove provided inside the threaded hole 2 432; at the same time, the assembly protrusion 3613 is consistent with the clearance groove 1 425;

[0097] The polished rod diameter of the second fastener 362 is smaller than the outer diameter of the thread of the threaded portion 3612 of the first fastener 361; this facilitates faster assembly;

[0098] The head of the second fastener 362 matches the second light hole 422, the second threaded portion 3622 matches the first threaded hole 324, and the second limit pin 3623 is stuck in the groove provided inside the first threaded hole 324; at the same time, the first slot 3621 is consistent with the first yielding slot 425;

[0099] The steps of replacing the blade in this embodiment are as follows:

[0100] Step 1: When the hedge trimmer provided by the present invention needs to install the blade 4, first, manually rotate the cover 313 to remove the cover 313 from the inside of the clearance hole 1 312; then insert the installation end of the blade 4 along the installation opening of the blade 4 reserved between the protective shell 31 and the protective plate 21; at this time, the installation head 1 421 and the installation head 2 431 on the blade 4 will automatically match with the installation groove 1 323 and the installation groove 2 333 respectively;

[0101] Step 2: Use a screwdriver to cooperate with the cross slot 1 221 to rotate the main shaft 22; adjust the drive plate 1 32 and the drive plate 2 33 to the same position. Figure 4 The vertical position of the state, that is, the driving plate 1 32 and the driving plate 2 33 are both located in the middle position of the reciprocating stroke; at this time, the threaded hole 1 324, the light hole 1 334, the light hole 2 422, and the threaded hole 2 432 are all in line with the clearance hole 1 312;

[0102] Step 3: First, use a screwdriver to sequentially pass one end of the fastener 361 on the fastening device 36 through the clearance hole 312, the light hole 334, the threaded hole 432, and the light hole 422; since the diameter of the light rod of the fastener 362 is smaller than the outer diameter of the thread of the threaded portion 3612 on the fastener 361, the threaded portion 3622 can quickly cooperate with the threaded hole 324 for threaded connection; connect the mounting head 421 with the mounting groove 323;

[0103] Step 4: Further, as the screwdriver drives the fastener 1 361 to rotate, the fastener 1 361 will drive the fastener 2 362 to rotate through the assembly protrusion 3613 and the slot 1 3621; when the threaded portion 2 3622 is threadedly fed, the threaded portion 1 3612 and the clearance groove 1 425 also make threaded feeding movements; so that the installation head 2 431 and the installation groove 2 333 are matched; thus, the quick-change device 3 can replace, connect and fix the strip knife 4; thus, the efficiency of replacing or installing the strip knife 4 is greatly improved;

[0104] Step 5: Finally, the cover 313 is rotated again to be assembled in the first clearance hole 312 to complete the installation of the blade 4;

[0105] Step 6: When the installed strip knife 4 needs to be disassembled and replaced, the processes of step 1 to step 5 are performed in reverse order; thus, the strip knife 4 is disassembled;

[0106] Embodiment 4:

[0107] like Figure 16-21 As shown, this embodiment is improved on the basis of the third embodiment; the difference from the fastening device 1 36 included in the quick-change device 3 described in the third embodiment is that: this embodiment is replaced by a fastening device 2 37; similarly, in this embodiment, a horizontally arranged yielding groove 1 425 is provided on the side of the left end of the blade 1 42 close to the blade 2 43 in the first embodiment; the difference from the third embodiment is that a convex strip cooperating with the yielding groove 1 425 is provided on the left end of the blade 2 43 close to the blade 1 42; there are two convex strips, which are respectively located on both sides of the second threaded hole 432; the function of the convex strips is to squeeze the second limiting plate 2 3725 in the second fastening device 37 below so that it is flush with the second slot 3723;

[0108] like Fig.21 As shown, the inner wall of the housing of the speed change device 2 is provided with a second clearance groove 211 near the first connection portion 322; the second clearance groove 211 and the first clearance groove 425 have the same width and are both located on the same horizontal plane;

[0109] The second fastening device 37 includes a third fastener 371 and a fourth fastener 372; the third fastener 371 has a cross groove 3712 at one end and a threaded portion 3711 at the other end;

[0110] The fastener 371 has a rectangular groove 3713 formed inside, and the rectangular groove 3713 is slidably connected to a limiting plate 3714;

[0111] One end surface of the fastener 4 372 is provided with a slot 2 3723, and the other end of the fastener 4 372 has a threaded portion 4 3721;

[0112] A rectangular groove 2 3722 is formed at the bottom of the second straight groove 3723, and the rectangular groove 2 3722 passes through the interior of the fourth fastener 372; the end surface of the fourth fastener 372 having the second straight groove 3723 is also formed with a rectangular groove 3 3724; the rectangular groove 3 3724 is vertically arranged with the short limiting plate 3726;

[0113] A second limiting plate 3725 is slidably disposed inside the second rectangular groove 3722;

[0114] A limiting short plate 3726 is fixedly arranged in the middle of the two side surfaces at one end of the limiting plate 2 3725, and the two limiting short plates 3726 are respectively slidably arranged inside the rectangular groove 3 3724; a spring is arranged between the limiting short plate 3726 and the rectangular groove 3 3724; in a normal state, the spring always presses against the limiting short plate 3726 and is flush with the end surface of the fastener 4 372, and the limiting plate 2 3725 is raised by a certain distance; the distance that the limiting plate 2 3725 is raised from the end surface is consistent with the depth of the straight groove 2 3723; Fig.19 ;

[0115] The first limiting plate 3714 has a notch 3715 at one end away from the second limiting plate 3725, and the first limiting plate 3714 has abutment rods 3716 on both sides close to the notch 3715;

[0116] The second limiting plate 3725 and the limiting short plate 3726 have a certain magnetism, which can attract the limiting plate 1 3714 to each other, thereby making the fastener 4 372 and the fastener 3 371 fit together; because the second limiting plate 3725 will protrude a certain distance from the end face of the fastener 4 372 under the action of the spring in a normal state; when the fastener 3 371 and the fastener 4 372 cooperate, the protruding part of the second limiting plate 3725 will be inserted into the bottom of the rectangular groove 1 3713 Fig.17 , because the limiting short plate 3726 will adsorb the end surface of the threaded portion 3711; thus, the fastener 371 and the fastener 4 372 cooperate with each other to form a whole Fig.16 As shown; at this time, the abutment rod 3716 will be pushed out by the limiting short plate 3726 for a distance, that is, the distance of the abutment rod 3716 protruding from the end face of the fastener three 371, which is the sum of the distance of the limiting plate two 3725 protruding from the end face of the fastener three 371 and the depth of the slot two 3723;

[0117] It needs to be further explained that the depth and width of the second clearance groove 211, the first clearance groove 425, and the second straight groove 3723 are consistent; when the fastener 4372 fixes the blade 4, the second straight groove 3723 and the first clearance groove 425 form a groove;

[0118] The length of the bolt screwed into the clearance hole 1 312 on the cover 313 is consistent with the wall thickness of the protective shell 31; at the same time, the side of the connecting portion 2 332 on the driving plate 2 33 close to the protective shell 31 slides and fits with the inside of the protective shell 31; in this way, when the cover 313 is screwed into the clearance hole 1 312, the bolt just fills the clearance hole 1 312; in this way, when the strip knife 4 is installed in this embodiment, the end face of the bolt of the cover 313 just squeezes the abutment rod 3716 to make it flush with the end face of the fastener 371; in this way, the limit plate 1 3714 and the limit plate 2 3725 The whole is displaced so that the end of the second limit plate 3725 away from the limit short plate 3726 is inserted into the second clearance groove 211; the end of the limit plate 1 3714 that contacts the second limit plate 3725 is inserted into the second slot 3723; at this time, the raised part of the limit plate 1 3714 inserted into the second slot 3723 is flush with the convex strip provided on the blade 2 43 and forms a whole B, so that when the blade 1 42 and the blade 2 43 reciprocate with each other later, the whole B will slide inside the clearance groove 1 425 to prevent the second limit plate 3725 from bouncing up again;

[0119] When the fastener 371 and the fastener 4 372 are tightened and assembled, the head of the fastener 371 matches the light hole 1 334; the threaded portion 3711 matches the threaded hole 2 432;

[0120] The diameter of the polished rod of the fastener 4 372 is smaller than the outer diameter of the thread of the threaded portion 3 3711 of the fastener 3 371; this facilitates faster assembly;

[0121] At this time, the head of the fourth fastener 372 matches the second light hole 422, and the fourth threaded portion 3721 matches the first threaded hole 324; at the same time, the second slot 3723 is consistent with the first yielding slot 425;

[0122] The steps of replacing the blade in this embodiment are as follows:

[0123] Step 1: When the hedge trimmer provided by the present invention needs to install the blade 4, first, manually rotate the cover 313 to remove the cover 313 from the inside of the clearance hole 1 312; then insert the installation end of the blade 4 along the installation opening of the blade 4 reserved between the protective shell 31 and the protective plate 21; at this time, the installation head 1 421 and the installation head 2 431 on the blade 4 will automatically match with the installation groove 1 323 and the installation groove 2 333 respectively;

[0124] Step 2: Use a screwdriver to cooperate with the cross slot 1 221 to rotate the main shaft 22; adjust the drive plate 1 32 and the drive plate 2 33 to the same position. Figure 4 The vertical position of the state, that is, the driving plate 1 32 and the driving plate 2 33 are both located in the middle position of the reciprocating stroke; at this time, the threaded hole 1 324, the light hole 1 334, the light hole 2 422, and the threaded hole 2 432 are all in line with the clearance hole 1 312;

[0125] Step 3: First, use a screwdriver to pass one end of the fastener 371 on the fastening device 2 37 through the clearance hole 1 312, the light hole 1 334, the threaded hole 2 432, and the light hole 2 422 in sequence; since the diameter of the light rod of the fastener 4 372 is smaller than the outer diameter of the thread of the threaded portion 3 3711 on the fastener 3 371; thus, the threaded portion 4 3721 can quickly cooperate with the threaded hole 1 324 for threaded connection; connect the mounting head 1 421 with the mounting groove 1 323;

[0126] Step 4: Further, as the screwdriver drives the fastener 371 to rotate, the fastener 371 will drive the fastener 4 372 to rotate through the rectangular groove 1 3713 and the raised part of the limit plate 2 3725; when the threaded portion 4 3721 is threadedly fed, the threaded portion 3 3711 and the clearance groove 1 425 also make threaded feeding movements; so that the installation head 2 431 cooperates with the installation groove 2 333; thus, the quick-change device 3 can replace, connect and fix the strip knife 4; thus, the efficiency of replacing or installing the strip knife 4 is greatly improved;

[0127] Step 5: After the fastener 371 and the fastener 432 fix the blade 2 43 and the blade 1 42 in place respectively; at this time, the limit plate 1 3714, the rectangular groove 2 3722 and the convex strips provided on the blade 2 43 are all in the same position (on the same spatial geometric surface) as the connecting line of the give-way chute 2 211 and the give-way chute 1 425; at this time, the cover 313 is rotated again to assemble in the give-way hole 1 312; as the screw on the cover 313 feeds, the end face of the screw will squeeze the abutment rod 3716 on the fastener 3 371 until the abutment rod 3716 is flush with the end of the fastener 3 371; at the same time, the limit plate 1 3714 overcomes the elastic force of the spring and squeezes the limit plate 2 3725 to move inside the give-way chute 2 211;

[0128] Because the distance between the end face of the fastener three 371 and the abutment rod 3716 is equal to the sum of the distance between the stop plate two 3725 and the end face of the fastener three 371 and the depth of the slot two 3723; thus, the end of the stop plate one 3714 close to the fastener four 372 will enter the slot two 3723, and at this time, the protruding part of the stop plate one 3714 inserted into the slot two 3723 will be flush with the convex strip provided on the blade two 43 and form a whole body B, so that when the blade one 42 and the blade two 43 reciprocate with each other later, the whole body B will slide inside the give way slot one 425 to prevent the stop plate two 3725 from bouncing up again;

[0129] With the extrusion of the limiting plate 1 3714, the limiting plate 2 3725 will move to the inside of the second clearance groove 211; in this way, the fastening device 2 37 at this time connects the fastener 3 371 and the fastener 4 372 into an integral component again through the limiting plate 2 3725 and the limiting plate 1 3714; when the present invention moves at a high speed, the limiting plate 2 3725 cooperates with the second clearance groove 211, and the end of the limiting plate 1 3714 cooperates with a groove formed by the two-slot groove 2 3723 and the clearance groove 1 425; the fastener 3 371 and the fastener 4 372 can be circumferentially limited to prevent the vibration generated during high-speed operation from causing the fastening device 2 37 to become loose and fall off;

[0130] Step 6: Finally, complete the installation of the blade 4;

[0131] Step 7: When the installed strip knife 4 needs to be disassembled and replaced, the process of steps 1 to 6 is performed in reverse order; in this way, the strip knife 4 is disassembled.

[0132] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A hedge trimmer with a quick-change blade, comprising a drive device (1), a speed change device (2), a quick-change device (3) and a blade (4); characterized in that: The output end of the driving device (1) is provided with a speed change device (2), and the speed change device (2) is connected to a strip knife (4) via a quick change device (3); when the strip knife (4) needs to be replaced, the strip knife (4) can be quickly replaced by adjusting the quick change device (3); the speed change device (2) comprises a housing, and the speed change device (2) has a main shaft (22) which is rotatably connected to the output end of the driving device (1); an eccentric wheel 1 (23) and an eccentric wheel 2 (24) are fixedly provided near the output end of the main shaft (22); the eccentric wheel 1 (23) and the eccentric wheel 2 (24) are arranged opposite to each other; the eccentric wheel 1 (23) and the eccentric wheel 2 (24) are both transmission-connected to the strip knife (4) via the quick change device (3); a cross groove 1 (221) is provided at the output end of the main shaft (22); The quick-change device (3) comprises a protective shell (31), a driving plate 1 (32) and a driving plate 2 (33); one end of the protective shell (31) is fixedly connected to the outer shell of the speed change device (2); the other end is provided with a driving plate 1 (32) and a driving plate 2 (33); an adjusting hole (311) is provided on the protective shell (31) near the output end of the main shaft (22); a clearance hole 1 (312) is provided on one side of the protective shell (31) near the blade (4), and a sealing cover (313) is threadedly connected inside the clearance hole 1 (312); The drive sheet 1 (32) and the drive sheet 2 (33) have the same structure. One side of the drive sheet 1 (32) is provided with a mounting hole 1 (321), and the other side has a connecting portion 1 (322); a side of the connecting portion 1 (322) close to the drive sheet 2 (33) is provided with a mounting groove 1 (323), and a side wall of the mounting groove 1 (323) is provided with a threaded hole 1 (324); The second drive plate (33) has a second mounting hole (331) on one side and a second connecting portion (332) on the other side; the second connecting portion (332) has a second mounting groove (333) on the side close to the first drive plate (32), and a first light hole (334) is formed on the side wall of the second mounting groove (333); The mounting hole 1 (321) and the mounting hole 2 (331) are rotatably connected to the main shaft (22) and the outer side of the eccentric wheel 1 (23) through bearings respectively; The strip knife (4) comprises a knife seat (41), a blade one (42) and a blade two (43); the blade one (42) and the blade two (43) are arranged side by side and connected to the knife seat (41) via a connecting assembly (44); a long gasket (411) is arranged between the knife seat (41) and the blade one (42); a mounting head one (421) is arranged at one end of the blade one (42) close to the quick-change device (3), and a light hole two (422) is arranged inside the mounting head one (421); a waist-shaped sliding groove one (423) is arranged at a distance from the side of the blade one (42) away from the mounting head one (421); The second blade (43) is provided with a second mounting head (431) at one end close to the quick-change device (3), and a second threaded hole (432) is provided inside the second mounting head (431); a second waist-shaped sliding groove (433) is provided at a distance from the second mounting head (431) on the side of the second blade (43); A second clearance hole (434) is provided at the end of the second waist-shaped slide groove (433) on one side close to the quick-change device (3); The plurality of connecting components (44) respectively penetrate the waist-shaped slide groove 2 (433) on the second blade (43), the waist-shaped slide groove 1 (423) on the first blade (42) and the through hole on the long gasket (411) to be fixedly connected to the blade seat (41); The mounting head 1 (421) cooperates with the mounting groove 1 (323) on the driving plate 1 (32) and is fastened and fixed by means of a screw 1 (34); The second mounting head (431) cooperates with the second mounting groove (333) on the second driving plate (33) and is fastened and fixed by means of the second screw (35); The position of the clearance hole 1 (312) is aligned with the maximum outward movement stroke of the threaded hole 1 (324) on the driving plate 1 (32); and a saw blade (424) is provided on the blade 1 (42); The screw head diameter of the screw 1 (34) is smaller than the screw rod diameter of the screw 2 (35); the setting position of the clearance hole 1 (312) is aligned with the middle position of the movement stroke of the threaded hole 1 (324) on the driving plate 1 (32); The steps for replacing the strip knife (4) are as follows: Step 1: First, manually rotate the cover (313) to remove the cover (313) from the inside of the clearance hole 1 (312); secondly, insert the installation end of the strip knife (4) along the installation opening of the strip knife (4) reserved between the protective shell (31) and the protective plate (21); at this time, the installation head 1 (421) and the installation head 2 (431) on the strip knife (4) will automatically match with the installation groove 1 (323) and the installation groove 2 (333) respectively; Step 2: Use a screwdriver to cooperate with the cross slot 1 (221) to rotate the main shaft (22); adjust the drive plate 1 (32) and the drive plate 2 (33) to a vertical position, that is, the drive plate 1 (32) and the drive plate 2 (33) are both located in the middle position of the reciprocating stroke; at this time, the threaded hole 1 (324), the light hole 1 (334), the light hole 2 (422), and the threaded hole 2 (432) are all in line with the clearance hole 1 (312); Step 3: First, use a screwdriver to sequentially pass screw 1 (34) through the clearance hole 1 (312), the smooth hole 1 (334), and the threaded hole 2 (432); tighten screw 1 (34) using a screwdriver to connect and mate the mounting head 1 (421) with the mounting slot 1 (323); Step 4: Use a screwdriver to pass the second screw (35) through the first clearance hole (312), and tighten the second screw (35) with the screwdriver to connect and cooperate the second mounting head (431) with the second mounting groove (333); thus, the quick-change device (3) can be replaced, connected and fixed to the blade (4); Step 5: Finally, the cover (313) is rotated again to be assembled in the first clearance hole (312); the installation of the blade (4) is completed; Step 6: When the installed strip knife (4) needs to be disassembled and replaced, the procedures of steps 1 to 5 are performed in reverse order; thus, the strip knife (4) is disassembled.

2. A hedge trimmer with quick-change blades as claimed in claim 1, characterized in that: A protective plate (21) is provided on one side of the housing close to the blade (4) for preventing splashing caused by the blade (4) shearing branches.

3. A hedge trimmer with quick-change blades as claimed in claim 2, characterized in that: The screw 1 (34) and the screw 2 (35) are replaced by a fastening device 1 (36); a horizontally arranged yielding groove 1 (425) is provided on the left side of the blade 1 (42) close to the blade 2 (43); the fastening device 1 (36) comprises a fastener 1 (361) and a fastener 2 (362); a cross groove 2 (3611) is provided on one end of the fastener 1 (361), and a mounting protrusion (3613) is provided on the other end; a threaded portion 1 (3612) is provided on one end of the fastener 1 (361) close to the mounting protrusion (3613); a limiting pin 1 (3614) is provided on the threaded tail of the threaded portion 1 (3612) in the middle of the fastener 1 (361); The second fastener (362) has a slot (3621) at one end thereof, the slot (3621) and the first displacement slide groove (425) have the same width and depth and are matched with the first threaded portion (3612); the second fastener (362) has a second threaded portion (3622) at one end thereof away from the slot (3621); a second limit pin (3623) is provided at the middle of the second fastener (362) near the threaded tail of the second threaded portion (3622); The assembly protrusion (3613) has a certain degree of magnetism; the diameter of the smooth rod of the second fastener (362) is smaller than the outer diameter of the thread of the threaded portion (3612) on the first fastener (361); the head of the second fastener (362) matches the second smooth hole (422), the second threaded portion (3622) matches the first threaded hole (324), and the second limit pin (3623) is stuck in the groove opened inside the first threaded hole (324); at the same time, the first straight groove (3621) is consistent with the first give-way slide groove (425).

4. A method for replacing blades of a hedge trimmer capable of quick blade change as claimed in claim 3, characterized in that: Step 1: First, manually rotate the cover (313) to remove the cover (313) from the inside of the clearance hole 1 (312); secondly, insert the installation end of the strip knife (4) along the installation opening of the strip knife (4) reserved between the protective shell (31) and the protective plate (21); at this time, the installation head 1 (421) and the installation head 2 (431) on the strip knife (4) will automatically match with the installation groove 1 (323) and the installation groove 2 (333) respectively; Step 2: Use a screwdriver to cooperate with the cross slot 1 (221) to rotate the main shaft (22); adjust the drive plate 1 (32) and the drive plate 2 (33) to a vertical position, that is, the drive plate 1 (32) and the drive plate 2 (33) are both located in the middle position of the reciprocating stroke; at this time, the threaded hole 1 (324), the light hole 1 (334), the light hole 2 (422), and the threaded hole 2 (432) are all in line with the clearance hole 1 (312); Step 3: First, use a screwdriver to sequentially pass one end of the fastener 1 (361) on the fastening device 1 (36) through the clearance hole 1 (312), the smooth hole 1 (334), the threaded hole 2 (432), and the smooth hole 2 (422); since the smooth rod diameter of the fastener 2 (362) is smaller than the thread outer diameter of the threaded portion 1 (3612) on the fastener 1 (361); thus, the threaded portion 2 (3622) can quickly cooperate with the threaded hole 1 (324) for threaded connection; connect the mounting head 1 (421) with the mounting groove 1 (323); Step 4: Further, as the screwdriver drives the fastener 1 (361) to rotate, the fastener 1 (361) will drive the fastener 2 (362) to rotate through the assembly protrusion (3613) and the slot 1 (3621); when the threaded portion 2 (3622) is threadedly fed, the threaded portion 1 (3612) and the clearance groove 1 (425) also perform threaded feeding movement; so that the installation head 2 (431) and the installation groove 2 (333) are matched; thus, the quick-change device (3) can replace, connect and fix the strip knife (4); thus, the efficiency of replacing or installing the strip knife (4) is greatly improved; Step 5: Finally, the cover (313) is rotated again to be assembled in the first clearance hole (312); the installation of the blade (4) is completed; Step 6: When the installed strip knife (4) needs to be disassembled and replaced, the procedures of steps 1 to 5 are performed in reverse order; thus, the strip knife (4) is disassembled.

5. A hedge trimmer with quick-change blades as claimed in claim 3, characterized in that: The fastening device 1 (36) is replaced by the fastening device 2 (37); a convex strip cooperating with the giving way groove 1 (425) is provided at the left end of the blade 2 (43) near the blade 1 (42); there are two convex strips, which are respectively located on both sides of the threaded hole 2 (432); The inner wall of the outer shell of the speed change device (2) is provided with a second clearance groove (211) near the first connection portion (322); the second clearance groove (211) and the first clearance groove (425) have the same width and are both located on the same horizontal plane; The second fastening device (37) comprises a third fastener (371) and a fourth fastener (372); the third fastener (371) has a cross groove (3712) at one end and a threaded portion (3711) at the other end; A rectangular groove 1 (3713) is provided inside the fastener 3 (371), and a limiting plate 1 (3714) is slidably connected inside the rectangular groove 1 (3713); The fastener 4 (372) has a slot 2 (3723) at one end surface, and a threaded portion 4 (3721) at the other end. A rectangular groove 2 (3722) is provided at the bottom of the second straight groove (3723), and the rectangular groove 2 (3722) passes through the interior of the fourth fastener (372); the end surface of the fourth fastener (372) having the second straight groove (3723) is also provided with a rectangular groove 3 (3724); the rectangular groove 3 (3724) is vertically arranged with the limiting short plate (3726); and a limiting plate 2 (3725) is slidably arranged inside the second straight groove (3722); A limiting short plate (3726) is fixedly arranged in the middle of the two side surfaces at one end of the second limiting plate (3725), and the two limiting short plates (3726) are respectively slidably arranged inside the third rectangular groove (3724); a spring is arranged between the limiting short plate (3726) and the third rectangular groove (3724); A notch (3715) is formed at one end of the first limiting plate (3714) away from the second limiting plate (3725), and abutment rods (3716) are provided on both sides of the first limiting plate (3714) close to the notch (3715); The second limiting plate (3725) and the short limiting plate (3726) have certain magnetism; The depth and width of the second clearance groove (211), the first clearance groove (425) and the second straight groove (3723) are consistent; The length of the bolt screwed into the first clearance hole (312) on the sealing cover (313) is consistent with the wall thickness of the protective shell (31); The diameter of the smooth rod of the fastener four (372) is smaller than the outer diameter of the thread of the threaded portion three (3711) on the fastener three (371); at this time, the head of the fastener four (372) matches the smooth hole two (422), and the threaded portion four (3721) matches the threaded hole one (324); at the same time, the slot two (3723) is consistent with the give-way slide slot one (425).

6. A method for replacing a blade of a hedge trimmer capable of quick blade change according to claim 5, characterized in that: Step 1: First, manually rotate the cover (313) to remove the cover (313) from the inside of the clearance hole 1 (312); secondly, insert the installation end of the strip knife (4) along the installation opening of the strip knife (4) reserved between the protective shell (31) and the protective plate (21); at this time, the installation head 1 (421) and the installation head 2 (431) on the strip knife (4) will automatically match with the installation groove 1 (323) and the installation groove 2 (333) respectively; Step 2: Use a screwdriver to cooperate with the cross slot 1 (221) to rotate the main shaft (22); adjust the drive plate 1 (32) and the drive plate 2 (33) to a vertical position, that is, the drive plate 1 (32) and the drive plate 2 (33) are both located in the middle position of the reciprocating stroke; at this time, the threaded hole 1 (324), the light hole 1 (334), the light hole 2 (422), and the threaded hole 2 (432) are all in line with the clearance hole 1 (312); Step 3: First, use a screwdriver to sequentially pass one end of the fastener 3 (371) on the fastening device 2 (37) through the clearance hole 1 (312), the smooth hole 1 (334), the threaded hole 2 (432), and the smooth hole 2 (422); since the smooth rod diameter of the fastener 4 (372) is smaller than the thread outer diameter of the threaded portion 3 (3711) on the fastener 3 (371); thus, the threaded portion 4 (3721) can quickly cooperate with the threaded hole 1 (324) for threaded connection; connect the mounting head 1 (421) with the mounting groove 1 (323); Step 4: Further, as the screwdriver drives the fastener 3 (371) to rotate, the fastener 3 (371) drives the fastener 4 (372) to rotate through the rectangular groove 1 (3713) and the raised portion of the limit plate 2 (3725); while the threaded portion 4 (3721) is threadedly fed, the threaded portion 3 (3711) and the clearance groove 1 (425) are also threadedly fed; The second mounting head (431) is matched with the second mounting groove (333); thus, the quick-change device (3) can be used to replace, connect and fix the strip knife (4); thus, the efficiency of replacing or installing the strip knife (4) is greatly improved; Step 5: After the fastener 3 (371) and the fastener 4 (372) fix the blade 2 (43) and the blade 1 (42) in place respectively; at this time, the limit plate 1 (3714) and the rectangular groove 2 (3722) are both in a position flush with the connecting line of the give-way chute 2 (211) and the give-way chute 1 (425); at this time, the cover (313) is rotated again to assemble in the give-way hole 1 (312); as the screw on the cover (313) feeds, the end face of the screw will squeeze the abutment rod (3716) on the fastener 3 (371) until the abutment rod (3716) is flush with the end of the fastener 3 (371); at the same time, the limit plate 1 (3714) overcomes the elastic force of the spring and squeezes the limit plate 2 (3725) to move inside the give-way chute 2 (211); Since the distance between the abutting rod (3716) and the end surface of the fastener three (371) is the sum of the distance between the stop plate two (3725) and the end surface of the fastener three (371) and the depth of the slot two (3723), the end of the stop plate one (3714) close to the fastener four (372) will enter the slot two (3723), and the stop plate two (3725) will move to the inside of the displacement slide groove two (211); thus, the stop plate two (3725) and the stop plate one (3714) are connected to each other. ) the fastener three (371) and the fastener four (372) are connected again to form an integral component; the end of the limit plate one (3714) and the two-shaped grooves (3723) and the one-way groove (425) form a groove through the cooperation of the limit plate two (3725) and the two-shaped grooves (3723) and the one-way groove (425); the fastener three (371) and the fastener four (372) can be limited in the circumferential direction to prevent the fastening device two (37) from becoming loose and falling off due to the vibration generated during high-speed operation; Step 6: Finally, complete the installation of the blade (4); Step 7: When the installed strip knife (4) needs to be disassembled and replaced, the procedures of steps 1 to 6 are performed in reverse order; thus, the strip knife is disassembled.

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