Adjustable saw chain

Abstract

The utility model discloses an adjustable saw chain which comprises a support, a first transmission part is movably connected to the outer wall of one side of the support, a second installation shaft is movably connected to the surface of the support, a worm gear is fixed to the outer wall of the circumference of the second installation shaft through a key, a worm is movably connected to the side wall of the support, and the worm and the worm gear are meshed with each other. A driving rod is movably connected to the side wall of the support, the driving rod and the second mounting shaft are in transmission through a crank rocker assembly, a second transmission part is fixed to one end of the driving rod, and a chain body is in transmission connection between the first transmission part and the second transmission part. By means of the characteristic of self-locking between the worm and the worm gear, after the chain body is tensioned between the first transmission part and the second transmission part, the relative stability between the first transmission part and the second transmission part is guaranteed, circular motion of the eccentric disc is converted into transverse motion of the driving rod through the swing arm, and therefore the chain body is tensioned. And the distance between the transmission part II and the transmission part I is adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of saw chains, in particular to an adjustable saw chain. Background Art

[0002] In the prior art, an electric chain saw is an electric tool mainly used for felling, pruning and wood processing. As the operation of the electric chain saw is relatively simple and convenient, more and more people are using it. When installing the electric chain saw, the saw chain needs to be installed on the guide plate and the transmission gear. After the installation is completed, the guide plate is slid, and the saw chain is tightened after the guide plate slides, so as to ensure the stability of the saw chain when in use. At present, the fixing method for the guide plate after tightening is mainly bolt fixing, which is easy to loosen, and the bolt is not easy to twist after rusting, so there are certain defects;

[0003] After searching, the Chinese patent application number 202021269352.4 discloses an adjustable electric chain saw alloy guide plate, including a guide plate, a main gear is provided on one side of the guide plate, a rotating shaft extending to the outside of the guide plate is fixedly provided at the center position of one end of the main gear, and a secondary gear is provided on the side of the guide plate away from the main gear.

[0004] The adjustable electric chain saw alloy guide plate in the above patent has the following shortcomings: the guide plate is driven to move laterally by the rotation of the gear. Although the guide plate tightens the chain, there is no mutual locking function between the gear and the rack. Therefore, the stability of the guide plate cannot be guaranteed after tightening, making it easy for the guide plate to be displaced. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and provides an adjustable saw chain.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An adjustable saw chain comprises a bracket, wherein a transmission part 1 is movably connected to an outer wall of one side of the bracket, a mounting shaft 2 is movably connected to the surface of the bracket, and a worm wheel is fixed to the circumferential outer wall of the mounting shaft 2 by means of a key, a worm is movably connected to the side wall of the bracket, and the worm and the worm wheel are meshed with each other, a driving rod is movably connected to the side wall of the bracket, and transmission is performed between the driving rod and the mounting shaft 2 by means of a crank rocker assembly, a transmission part 2 is fixed to one end of the driving rod, and a chain body is transmission-connected between the transmission parts 1 and 2.

[0008] As a further solution of the utility model: the crank rocker assembly includes a U-shaped frame and an eccentric disk, the eccentric disk is welded to one end of the mounting shaft, and the U-shaped frame is welded to one end of the driving rod, and the eccentric disk and the U-shaped frame are movably connected with the same swing arm.

[0009] As a further solution of the utility model: the transmission part 1 includes a gear 1 and a mounting shaft 1, the mounting shaft 1 is movably connected to the side wall of the bracket, and the gear 1 is fixed to the outer wall of the mounting shaft 1 by a pin.

[0010] As a further solution of the utility model: the transmission part 2 includes a guide plate and a cushion block, the cushion block is welded to one end of the driving rod, and the guide plate is fixed to the outer wall of one side of the cushion block by screws, and the end of the guide plate is movably connected with gear 2.

[0011] As a further solution of the utility model: an L-shaped plate is welded at the bottom of the bracket, and one end of the L-shaped plate away from the bracket is fixed to a limiting frame by bolts.

[0012] As a further solution of the utility model: an adjusting knob is welded on one end of the worm.

[0013] As a further solution of the utility model: the chain body and the gear 1 and the gear 2 are meshed with each other.

[0014] As a further solution of the utility model: a protrusion is provided on the circumferential outer wall of the adjusting knob.

[0015] Compared with the prior art, the utility model provides an adjustable saw chain, which has the following beneficial effects:

[0016] By utilizing the self-locking characteristics between the worm and the worm wheel, when the chain body is tensioned between the transmission part 1 and the transmission part 2, the relative stability between the transmission part 1 and the transmission part 2 is ensured;

[0017] The swing arm is used to convert the circular motion of the eccentric disc into the lateral motion of the driving rod, thereby adjusting the distance between the transmission part 2 and the transmission part 1;

[0018] The guide plate and the limit frame play a guiding and correcting role for the chain body, ensuring that the chain body moves along the predetermined route during transmission.

[0019] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is a schematic diagram of the side structure of the utility model.

[0022] Figure 3 This is a schematic diagram of the chain installation structure of the utility model.

[0023] Figure 4This is a schematic diagram of the installation structure of the adjustment component of the utility model.

[0024] Figure 5 It is a schematic diagram of the overall structure of the adjustment component of the utility model.

[0025] Figure 6 It is a schematic diagram of the local structure of the adjustment component of the utility model.

[0026] In the figure: 1-guide plate, 2-chain body, 3-gear one, 4-gear two, 5-mounting shaft one, 6-bracket, 7-limiting frame, 8-worm gear, 9-mounting shaft two, 10-L-type plate, 11-driving rod, 12-pad, 13-worm, 14-U-type frame, 15-swing arm, 16-eccentric disk, 17-adjusting knob. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention. Embodiment 1:

[0029] An adjustable saw chain, in order to ensure stability after adjustment, such as Figure 1-6 As shown, it includes a bracket 6, and a transmission part 1 is rotatably connected to the outer wall of one side of the bracket 6, and a mounting shaft 2 9 is rotatably connected to the surface of the bracket 6, and a worm wheel 8 is fixed to the circumferential outer wall of the mounting shaft 2 9 by a key, and a worm 13 is rotatably connected to the side wall of the bracket 6, and the worm 13 and the worm wheel 8 are meshed with each other, and a driving rod 11 is slidably connected to the side wall of the bracket 6, and the driving rod 11 and the mounting shaft 2 9 are driven by a crank rocker assembly, and a transmission part 2 is fixed to one end of the driving rod 11, and a chain body 2 is transmission-connected between the transmission part 1 and the transmission part 2.

[0030] When in use, first fix the bracket 6 and the electric chain saw housing together, and then put the chain body 2 on the transmission part 1 and the transmission part 2 by means of a socket connection. In the initial stage, the distance between the transmission part 1 and the transmission part 2 is the smallest, which is convenient for the socketing of the chain body 2. When the socketing of the chain body 2 is completed and the chain body 2 needs to be tightened, the worm 13 is rotated so that the worm 13 drives the worm wheel 8 to rotate. During the rotation of the worm wheel 8, the crank rocker assembly is used to convert the circular motion of the worm wheel 8 into the linear motion of the drive rod 11, so that the drive rod 11 drives the transmission part 2 to move in the direction away from the transmission part 2. As the distance between the transmission part 1 and the transmission part 2 increases, the chain body 2 is tightened to ensure that the chain body 2 will not fall off during use.

[0031] At the same time, the worm wheel 8 and the worm 13 have a self-locking function, that is, the worm 13 can drive the worm wheel 8 to rotate, and the worm wheel 8 cannot reversely drive the worm 13 to rotate. By utilizing this structural feature, during use, the worm wheel 8 and the second mounting shaft 9 will not produce an angular deflection relative to the bracket 6, thereby ensuring the stability of the transmission part 1 and the transmission part 2 in tensioning the chain body 2.

[0032] Furthermore, the crank rocker assembly includes a U-shaped frame 14 and an eccentric disk 16, the eccentric disk 16 is welded to one end of the mounting shaft 29, and the U-shaped frame 14 is welded to one end of the driving rod 11, and the eccentric disk 16 and the U-shaped frame 14 are rotatably connected with the same swing arm 15.

[0033] When the eccentric disk 16 rotates, the swing arm 15 is used to convert the circular motion of the eccentric disk 16 into the linear motion of the U-shaped frame 14 and the driving rod 11. The driving rod 11 adjusts the distance between the second transmission part and the first transmission part during the movement.

[0034] Furthermore, the transmission part 1 includes a gear 1 3 and a mounting shaft 1 5, the mounting shaft 1 5 is rotatably connected to the side wall of the bracket 6, and the gear 1 3 is fixed to the outer wall of the mounting shaft 1 5 by a pin.

[0035] The transmission part 2 includes a guide plate 1 and a cushion block 12, the cushion block 12 is welded to one end of the driving rod 11, and the guide plate 1 is fixed to the outer wall of one side of the cushion block 12 by screws, and the end of the guide plate 1 is rotatably connected to the gear 2 4, and the chain body 2 and the gear 1 3 and the gear 2 4 are meshed with each other.

[0036] When in use, the mounting shaft 5 is connected to the power output end of the electric chain saw. The power output end is preferably a motor. After the gear 3 rotates under the drive of the motor, the chain body 2 can perform sawing operations while rotating along the gear 3 and the mounting shaft 5.

[0037] Furthermore, an L-shaped plate 10 is welded to the bottom of the bracket 6 , and one end of the L-shaped plate 10 away from the bracket 6 is fixed to the limiting frame 7 by bolts.

[0038] The limiting frame 7 and the guide plate 1 can guide the moving path of the chain body 2.

[0039] Working principle: When in use, fix the bracket 6 and the electric chain saw housing, then connect the power output end of the electric chain saw and the mounting shaft 1 5, then sleeve the chain body 2 on the outer walls of gear 1 3 and gear 2 4, then rotate the worm 13, and use the worm 13 to drive the worm wheel 8 to rotate. After the rotation, the worm wheel 8 drives the eccentric disk 16 to rotate, and use the swing arm 15 to make the drive rod 11 slide along the bracket 6 under the drive of the eccentric disk 16, thereby moving the transmission part 2 in the direction away from the transmission part 1, so that the transmission part 2 and the transmission part 1 gradually tighten the chain body 2. Embodiment 2:

[0040] An adjustable saw chain, such as Figure 1-6 As shown, in order to facilitate the rotation of the worm 13, this embodiment makes the following supplements on the basis of embodiment 1: an adjusting knob 17 is welded to one end of the worm 13, and a protrusion is provided on the circumferential outer wall of the adjusting knob 17.

[0041] The adjustment knob 17 is provided to facilitate the rotation of the worm 13 , and the protrusion increases the friction between the hand and the adjustment knob 17 .

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An adjustable saw chain, comprising a bracket (6), characterized in that: The outer wall of one side of the bracket (6) is movably connected to a transmission part 1, the surface of the bracket (6) is movably connected to a mounting shaft 2 (9), and a worm wheel (8) is fixed to the circumferential outer wall of the mounting shaft 2 (9) by means of a key, the side wall of the bracket (6) is movably connected to a worm (13), and the worm (13) and the worm wheel (8) are meshed with each other, the side wall of the bracket (6) is movably connected to a driving rod (11), and the driving rod (11) and the mounting shaft 2 (9) are driven by a crank rocker assembly, one end of the driving rod (11) is fixed to the transmission part 2, and a chain body (2) is drivingly connected between the transmission part 1 and the transmission part 2.

2. An adjustable saw chain according to claim 1, characterized in that: The crank rocker assembly comprises a U-shaped frame (14) and an eccentric disk (16), wherein the eccentric disk (16) is welded to one end of the second mounting shaft (9), and the U-shaped frame (14) is welded to one end of the driving rod (11), and the eccentric disk (16) and the U-shaped frame (14) are movably connected to a common swing arm (15).

3. An adjustable saw chain according to claim 2, characterized in that: The transmission part 1 comprises a gear 1 (3) and a mounting shaft 1 (5); the mounting shaft 1 (5) is movably connected to a side wall of a bracket (6), and the gear 1 (3) is fixed to an outer wall of the mounting shaft 1 (5) by a pin.

4. An adjustable saw chain according to claim 3, characterized in that: The second transmission part comprises a guide plate (1) and a cushion block (12), wherein the cushion block (12) is welded to one end of the driving rod (11), and the guide plate (1) is fixed to an outer wall of one side of the cushion block (12) by means of screws, and the end of the guide plate (1) is movably connected to a second gear (4).

5. An adjustable saw chain according to claim 4, characterized in that: An L-shaped plate (10) is welded to the bottom of the bracket (6), and one end of the L-shaped plate (10) away from the bracket (6) is fixed to the limiting frame (7) by means of bolts.

6. An adjustable saw chain according to claim 5, characterized in that: An adjusting knob (17) is welded to one end of the worm (13).

7. An adjustable saw chain according to claim 6, characterized in that: The chain body (2) and gear one (3) and gear two (4) are meshed with each other.

8. The adjustable saw chain according to claim 7, characterized in that: The outer circumferential wall of the adjusting knob (17) is provided with a protrusion.

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