Protective farming strip tiller

Abstract

The invention discloses a protective farming strip tiller, and belongs to the technical field of agricultural machinery. According to the protective tillage strip tillage machine, the mode that multiple sets of harrow blades are combined and staggered is adopted, the working efficiency of a machine tool is improved, and power fuel oil consumption is reduced. A machine frame is composed of a main machine frame and an auxiliary machine frame, and the main machine frame and the auxiliary machine frame are each provided with a harrow blade mechanism, a soil blocking mechanism, a traction beam damping mechanism and a soil crushing and pressing mechanism. According to the invention, a plurality of groups of harrow blades are arranged in a staggered manner, soil needing to be cultivated is repeatedly cut up and mixed, the harrow blades rotate in a passive manner, power output of a tractor is not needed, only traction force is needed, so that the operation speed is increased, and the power consumption is reduced. Besides, each group of harrow blades has a radian, and soil can be thrown to one side in the high-speed operation process, so that straws on the earth surface are shallowly buried, and the straws are stabilized and cannot be blown away by wind.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural machinery. Background Art

[0002] The strip tiller helps achieve a balance between eco-friendliness and high yield by reducing soil disturbance and improving resource efficiency. The current strip tiller for agricultural farming is a rotary tiller, which mainly requires the tractor power output shaft to drive the rotary tillage blade to break and mix the soil. The speed of this type of strip tiller cannot be fast, otherwise large clods of soil will easily appear in places that cannot be tilled. In addition, the rotary tiller can only till the area to be worked, and cannot process the straw on the straw leisure belt. If there is a strong wind during the sowing period, the straw will be blown to the sowing belt, affecting seedling emergence and spraying. Summary of the invention

[0003] The purpose of the present invention is to adopt a plurality of groups of harrow blades in a staggered combination mode, thereby improving the operation efficiency of the machine and reducing the power and fuel consumption of a protective tillage strip tiller.

[0004] The invention comprises a frame, a traction beam, a ground wheel, a soil retaining plate, a spiral soil covering roller installed on the wide gap section of the soil covering hanger, a rake blade, and a hydraulic cylinder. a. The frame is divided into a main frame and a sub-frame. The extended part of the sub-frame crossbeam on the sub-frame is installed on the frame axle seat through the frame shaft, and the frame axle seat is fixedly installed on the side longitudinal beam of the main frame; the main frame and the sub-frame are installed with a sub-frame lifting mechanism, and the sub-frame lifting mechanism: a hydraulic cylinder cylinder end axle seat is fixedly installed on the main frame crossbeam, the bottom end of the cylinder body of the hydraulic cylinder is installed on the main frame axle seat through the bottom end shaft, and the rod end connecting seat fixedly connected to the top of the piston rod of the hydraulic cylinder is installed on the sub-frame axle seat through the top end shaft, and the sub-frame axle seat is fixedly installed on the sub-frame crossbeam on the same line as the main frame crossbeam; b. Installing the same arrangement of rake blade mechanisms on the main frame and the auxiliary frame respectively. The rake blade mechanism: the rake blade mechanism comprises two sets of rake blade mounting frames bent in opposite directions to each other. The top of the rake blade mounting frame is fixedly mounted on the main frame or the auxiliary frame. The bottom of the rake blade mounting frame is equipped with a rake blade shaft. The rake blade bearing is sleeved on the rake blade shaft. The rake blade is installed outside the rake blade bearing. c. A retaining mechanism is installed on the outer side of the front end of the target piece group corresponding to the main frame or the auxiliary frame. The retaining mechanism: a retaining frame mounting hole is opened at the upper end of the retaining frame, and the retaining frame is installed in the retaining frame mounting sleeve through bolts and the retaining frame mounting hole. The retaining frame mounting sleeve is fixed on the main frame or the auxiliary frame, and a retaining plate is installed on the retaining shaft at the lower end of the retaining frame through a bearing; d. A traction frame connecting plate is fixedly installed under the crossbeam at the front end of the main frame, and the traction beam is installed on the traction frame connecting plate through the traction shaft; e. A traction beam shock-absorbing mechanism is installed on the main frame and the traction beam. The traction beam shock-absorbing mechanism includes: a traction upper baffle and a traction lower baffle are fixedly installed on the upper and lower ends of the traction rod respectively; the bottom end of the traction rod is installed on the traction beam axle seat through the traction rod shaft; the traction beam axle seat is fixedly installed on the traction beam; a traction slider is mounted on the traction rod between the traction upper baffle and the traction lower baffle; an upper shock-absorbing spring and a lower shock-absorbing spring are mounted on the traction rod between the traction upper baffle and the traction slider and between the traction lower baffle and the traction slider respectively; the traction slider is mounted on the main frame axle seat through the slider shaft; and the main frame axle seat is fixed on the main frame; f. Soil crushing and suppression mechanisms are installed at the tail ends of the main frame and the auxiliary frame. The soil crushing and suppression mechanisms are as follows: the lower end of the narrow gap section of the soil covering bracket is installed on the telescopic rod shaft seat at the bottom end of the telescopic rod through the lower angle shaft, a spring stopper sleeve is mounted on the upper part of the telescopic rod, a buffer spring is mounted on the telescopic rod between the spring stopper sleeve and the telescopic rod shaft seat, a rear shaft sleeve is fixed on the side wall of the spring stopper sleeve, the rear shaft sleeve is mounted on the rear angle shaft, the rear angle shaft is mounted on the rear end of the arc arm, the front of the arc arm is connected to the upper end of the narrow gap section of the soil covering bracket through the front angle shaft, the front end of the arc arm is fixedly mounted with a rack mounting seat, and the rack mounting seat is mounted on the tail crossbeam of the main frame or the auxiliary frame.

[0005] The rake blade mechanism of the present invention is suspended on the rake blade cross beam, one end of the rake blade cross beam is installed on one side longitudinal beam of a frame through a cross beam shaft, and the other end extends out of the other side longitudinal beam of the frame, and an angle adjustment pin is installed at the extended portion, the angle adjustment pin is placed in the angle adjustment arc groove and is clamped by a clamping cap at the top end, the angle adjustment arc groove is opened on the adjustment plate, and the adjustment plate is fixed on the frame.

[0006] The present invention arranges multiple groups of rake blades in an interlaced manner to repeatedly chop and mix the soil to be cultivated. The rake blades rotate passively, do not require tractor power output, and only require traction, thereby increasing the operating speed and reducing power consumption. In addition, each group of rake blades of the present invention has an arc, which will throw the soil to one side during high-speed operation, thereby shallowly burying the straw on the surface and stabilizing the straw so that it will not be blown away by the wind. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a side view of the overall structure of the present invention; Figure 2 It is a top perspective view of the overall structure of the present invention; Figure 3 It is a bottom-up stereogram of the overall structure of the present invention; Figure 4 It is an enlarged schematic diagram of the connection part between the frame and the traction beam of the present invention; Figure 5 It is a schematic diagram of the structure of the soil crushing and suppressing mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of a single set of rake blades of the present invention; Figure 7 This is a top view of the structure of a single set of rake blades of the present invention; Figure 8 This is a front view of a single set of rake blade mechanism structure of the present invention; Fig. 9 It is a schematic diagram of the auxiliary frame lifting mechanism of the present invention; Fig.10 It is a schematic diagram of the structure of the traction beam damping mechanism of the present invention; Fig.11 It is a schematic diagram of the structure of the earth retaining mechanism of the present invention. DETAILED DESCRIPTION

[0008] The existing rotary tiller has a rotary tiller blade and an axis. The axis rotates and the blade rotates, and the soil needs to be rotated layer by layer. The tractor is too fast. Before finishing the work here, it rotates to till the next piece of land, which is easy to miss the cultivated land. In order not to miss the land, the operator can only slow down the speed. According to actual calculations, the general speed is maintained at 3 km per hour. After the transformation of the present invention, not only the walking speed can be increased to increase the work efficiency, but also the broken straw can be shallowly buried in the soil through the structure of the rake blade, which will not be blown away by the wind, thereby ensuring the requirement of returning the straw to the field and will not affect the later emergence and spraying of pesticides.

[0009] The present invention includes a frame 5 which is installed by horizontal and longitudinal beams, a traction beam 8 which is a suspension device for connecting to a traction device, a ground wheel 402 which is a wheel for dragging the entire equipment when in a non-working transport state, a soil retaining plate 204 which is used to prevent the soil from extending to both sides, and a spiral soil covering roller 106 which is installed on a wide gap section of a soil covering bracket 108. This part of the technology is a utility model patent "Wide and Narrow Row Deep Plowing and Fertilizer Spreading Machine" declared by the applicant of the present invention in 2024, with patent application number: 2024226165048. The rake blade 304 is an existing disc rake, and the hydraulic cylinder is a conventional hydraulic cylinder, which is adopted by the present invention when raising and lowering the auxiliary frame 501.

[0010] The illustration provided by the present invention is described with a main frame and auxiliary frames installed on both sides thereof.

[0011] a. The frame 5 is divided into a main frame 502 and a sub-frame 501. The extended part of the sub-frame cross beam 504 on the sub-frame 501 is installed on the frame shaft seat 503 through the frame shaft 505, and the frame shaft seat 503 is fixedly installed on the side longitudinal beam of the main frame 502; a sub-frame lifting mechanism is installed on the main frame 502 and the sub-frame 501, and the sub-frame lifting mechanism: a hydraulic cylinder cylinder body end shaft seat 602 is fixedly installed on the main frame cross beam 506, the cylinder body bottom end of the hydraulic cylinder 601 is installed on the main frame shaft seat 602 through the bottom end shaft 603, and the rod end connecting seat 604 fixedly connected to the top end of the piston rod of the hydraulic cylinder 601 is installed on the sub-frame shaft seat 606 through the top end shaft 605, and the sub-frame shaft seat 606 is fixedly installed on the sub-frame cross beam 504 which is on the same line as the main frame cross beam 506.

[0012] See Figure 1 , Figure 2 and Fig. 9 The present invention adopts two sets of lifting and lowering mechanisms 6. The piston rod of the hydraulic cylinder is extended and retracted to complete the lifting or lowering of the auxiliary frames 501 on both sides. During transportation, the auxiliary frames 501 are lifted up and separated from the ground, and the main frame 502 also needs to be separated from the ground (this ground is not an agricultural farming ground, but an ordinary road surface during transportation). At this time, the ground wheel lifting mechanism 4 is needed to complete it. Figure 3 The upper end of the ground wheel frame 401 of the ground wheel lifting mechanism 4 is mounted on the main frame 502 in the form of an axis, and the ground wheel 402 is mounted on the lower end of the ground wheel frame 401 through a bearing. A hydraulic cylinder 403 is also installed between the lower end of the ground wheel frame 401 and the main frame 502. Figure 3 It can be seen that the ground wheel frame 401, the main frame 502 and the hydraulic cylinder 403 form a triangle, and the ground wheel frame 401 and the ground wheel 402 are lifted and lowered by the extension and contraction of the hydraulic cylinder 403. When lowering, the entire frame is supported at the same time, so as to be out of contact with the ground. Through the above structure, the main frame 502 and the auxiliary frame 501 can be out of contact with the ground with the mechanisms above them during transportation. After moving to the working ground, the ground wheel mechanism 4 is first retracted to make the main frame 502 contact with the ground, and then the lifting and lowering mechanism 6 is lowered to make the auxiliary frame 501 contact with the ground, and the auxiliary frame 501 and the main frame 502 are placed in the same horizontal state, and then work can be carried out.

[0013] b. The same arrangement of rake blade mechanisms 3 are respectively installed on the main frame 502 and the auxiliary frame 501. The rake blade mechanism 3 includes two sets of rake blade mounting frames 301 bent in opposite directions. The top of the rake blade mounting frame 301 is fixedly installed on the main frame 502 or the auxiliary frame 501. The bottom of the rake blade mounting frame 301 is installed with a rake blade shaft 302. The rake blade bearing 303 is sleeved on the rake blade shaft 302, and a rake blade 304 is installed outside the rake blade bearing 303.

[0014] See Figure 3 and Figure 6 , Figure 7 , Figure 8 ,from Figure 3 It can be seen that the present invention only includes three sets of frames (main frame 502, two sets of auxiliary frames 501) and two sets or groups of rake blade mechanisms 3 on each set of frames. In actual use, additional frames or rake blade mechanisms can be added according to actual conditions. Figure 6 This is the arrangement form of a single set of harrow blade mechanism 3. The present invention is described separately for a single set of harrow blade mechanism 3 (the present invention uses six harrow blades, and the number of harrow blades can also be increased or decreased according to actual conditions, depending on actual agricultural needs). Figure 3 On the frame, three rake blade mounting frames 301 bent to the left are fixedly installed in the first row, and rake blade mounting frames 301 bent to the right are installed in the second row, and the rake blades in the first row and the second row are installed oppositely according to the concave side of the rake blades, thus forming the second row of right-facing target blade groups and the first row of left-facing target blade groups (the direction here is based on the concave side as an example), see Figure 7 From the top view, it can be seen that the first row of concave surfaces are all facing the left side, and the second row of concave surfaces are all facing the right side, so that a complementary relationship will be formed when raking the soil. Figure 8 , from the rear view angle, the two sets of rake blades are interlocked, and they look like a coconut shape.

[0015] c. A soil retaining mechanism 2 is installed on the outer side of the front end of the target piece group corresponding to the main frame 502 or the auxiliary frame 501. The soil retaining mechanism 2: a soil retaining frame mounting hole 202 is opened at the upper end of the soil retaining frame 205, which is installed in the soil retaining frame mounting sleeve 201 through bolts in cooperation with the soil retaining frame mounting hole 202. The soil retaining frame mounting sleeve 201 is fixed on the main frame 502 or the auxiliary frame 501, and a soil retaining plate 204 is installed on the soil retaining shaft 203 at the lower end of the soil retaining frame 205 through a bearing.

[0016] See Figure 1 , Figure 2 , Figure 3 and Fig.11 ,from Figure 1 It can be seen that the installation position of the soil retaining mechanism 2 is placed outside the frame 5 and slightly behind the outside of the rake blade mechanism 3 ( Figure 1 The right side is the traction side, so it is defined as the front side), and its purpose is to block the soil on the side of the rake blade mechanism 3 to prevent soil, soil blocks, etc. from rolling down to other rows. Corresponding mounting holes (soil retaining frame mounting holes 202) are opened on the soil retaining frame mounting sleeve 201 and the soil retaining frame 205, and the mounting holes can be fixedly installed corresponding to the mounting holes on the soil retaining frame mounting sleeve 201 according to actual conditions.

[0017] d. A traction frame connecting plate 9 is fixedly installed under the crossbeam at the front end of the main frame 502, and the traction beam 8 is installed on the traction frame connecting plate 9 through the traction shaft 10. Figure 4 .

[0018] e. A traction beam damping mechanism 7 is installed on the main frame 502 and the traction beam 8. The traction beam damping mechanism 7: the upper end and the lower end of the traction rod 706 are respectively fixedly installed with a traction upper baffle 702 and a traction lower baffle 705, the bottom end of the traction rod 706 is installed on the traction beam axle seat 708 through the traction rod shaft 707, the traction beam axle seat 708 is fixedly installed on the traction beam 8, the traction rod 706 between the traction upper baffle 702 and the traction lower baffle 705 is sleeved with a traction slider 703, the traction rod 706 between the traction upper baffle 702 and the traction slider 703 and the traction lower baffle 705 and the traction slider 703 are respectively sleeved with an upper damping spring 710 and a lower damping spring 704, the traction slider 703 is installed on the main frame axle seat 701 through the slider shaft 709, and the main frame axle seat 701 is fixed on the main frame 502.

[0019] Steps d and e work together, see Figure 4 and Fig.10 , Figure 4 In the figure, the traction frame connecting plate 9 is a fixed mounting plate, which is synchronized with the main frame 502, and the traction beam 8 is connected to the traction frame connecting plate 9 in the form of an axis (traction axis 10), that is, the traction beam 8 and the traction frame connecting plate 9 can rotate based on this axis, which is to prevent the up and down vibration of the tractor from being partially eliminated by this part during traction work, and will not be rigidly transmitted to the main frame 502. Since a single axis connection cannot be relatively stable, a traction beam damping mechanism 7 is designed to cooperate with the axis to stabilize and eliminate vibration at the same time. Fig.10 The traction slider 703 can slide up and down on the traction rod 706 to eliminate the vibration between the main frame 502 and the traction beam 8, thereby protecting the connection point between the main frame 502 and the traction beam 8. Fig.10 It can be seen that the main frame axle seat 701 moves synchronously with the main frame 502, and the traction beam axle seat 708 moves synchronously with the traction beam 8. When the traction slider 703 moves upward, it will compress the upper damping spring 710, and when it moves downward, it will compress the lower damping spring 704. When returning to a stable road surface, the traction slider 703 is reset by the elastic force of the spring.

[0020] f. A soil crushing and suppressing mechanism 1 is installed at the tail end of the main frame 502 and the auxiliary frame 501. The soil crushing and suppressing mechanism 1: the lower end of the narrow gap section of the soil covering bracket 108 is installed on the telescopic rod shaft seat 112 at the bottom end of the telescopic rod 103 through the lower angle shaft 107, and a spring stopper sleeve 104 is sleeved on the upper part of the telescopic rod 103. A buffer spring 105 is sleeved on the telescopic rod 103 between the spring stopper sleeve 104 and the telescopic rod shaft seat 112. A limit screw can be set on the upper end of the spring stopper sleeve 104. Bolt to prevent the spring stop sleeve 104 from escaping from the upper end, a rear axle sleeve 111 is fixed on the side wall of the spring stop sleeve 104, the rear axle sleeve 111 is sleeved on the rear angle shaft 110, the rear angle shaft 110 is installed at the rear end of the arc arm 102, the front of the arc arm 102 is connected to the upper end of the narrow gap section of the covering bracket 108 through the front angle shaft 109, the front end of the arc arm 102 is fixedly installed with a rack mounting seat 101, and the rack mounting seat 101 is installed on the tail beam of the main frame 502 or the auxiliary frame 501.

[0021] The soil crushing and suppressing mechanism 1 is mainly used for crushing soil. When the rake blade turns up the soil, some larger soil lumps will be generated, which are crushed by the spiral soil covering roller 106. The applicant of the present invention has applied for a patent for this mechanism, and will not go into details here. The present invention mainly improves the pressure buffer mechanism on the soil crushing and suppressing mechanism 1 according to the needs of the present invention. Figure 5 The linkage mechanism composed of the arc arm 102, the telescopic rod 103 and the spring stop sleeve 104 and the narrow gap section of the soil covering bracket 108 form a triangle, and this triangle is connected by three axes (lower angle axis 107, front angle axis 109, and rear angle axis 110). The spring stop sleeve 104 can slide up and down on the telescopic rod 103, so that the arc arm 102 and the narrow gap section of the soil covering bracket 108 can open and close like a clamp. The design of this mechanism is that under the action of the spring, the wide gap section of the soil covering bracket 108 is increased to force the spiral soil covering roller 106 downward, thereby increasing the soil crushing force of the spiral soil covering roller 106.

[0022] Due to the softness and hardness of the soil, the present invention designs a mechanism for adjusting the direction of the rake blade to rake the soil. Figure 7 The rake blade mechanism 3 is suspended on the rake blade cross beam 308, one end of the rake blade cross beam 308 is installed on the longitudinal beam on one side of the frame 5 through the cross beam shaft 309, and the other end extends out of the longitudinal beam on the other side of the frame 5, and an angle adjustment pin 307 is installed at the extended portion, the angle adjustment pin 307 is placed in the angle adjustment arc groove 305, and is clamped by the clamping cap at the top, the angle adjustment arc groove 305 is opened on the adjustment plate 306, and the adjustment plate 306 is fixed on the frame 5.

[0023] Normal form Figure 7 and Figure 8The harrow blades are in a straight line when raking the soil. However, sometimes, according to the different soil viscosities, the spacing between the harrow blades in the same group can be changed by adjusting the clips on the harrow blades to achieve the desired working effect.

Claims

1. A conservation tillage strip tiller, comprising a frame 5, a traction beam 8, a ground wheel 402, a soil retaining plate 204, a spiral soil covering roller 106 mounted on a wide gap section of a soil covering bracket 108, a rake blade 304, and a hydraulic cylinder, characterized in that: a. The frame 5 is divided into a main frame 502 and a sub-frame 501. The extended part of the sub-frame cross beam 504 on the sub-frame 501 is installed on the frame shaft seat 503 through the frame shaft 505, and the frame shaft seat 503 is fixedly installed on the side longitudinal beam of the main frame 502; a sub-frame lifting mechanism is installed on the main frame 502 and the sub-frame 501. The sub-frame lifting mechanism: a hydraulic cylinder cylinder body end shaft seat 602 is fixedly installed on the main frame cross beam 506, the cylinder body bottom end of the hydraulic cylinder 601 is installed on the main frame shaft seat 602 through the bottom end shaft 603, and the rod end connecting seat 604 fixedly connected to the top of the piston rod of the hydraulic cylinder 601 is installed on the sub-frame shaft seat 606 through the top end shaft 605, and the sub-frame shaft seat 606 is fixedly installed on the sub-frame cross beam 504 on the same line as the main frame cross beam 506; b. The same arrangement of rake blade mechanism 3 is respectively installed on the main frame 502 and the auxiliary frame 501. The rake blade mechanism 3 includes two sets of rake blade mounting frames 301 bent in opposite directions. The top of the rake blade mounting frame 301 is fixedly installed on the main frame 502 or the auxiliary frame 501. The bottom of the rake blade mounting frame 301 is installed with a rake blade shaft 302. The rake blade bearing 303 is sleeved on the rake blade shaft 302. The rake blade 304 is installed outside the rake blade bearing 303. c. A soil retaining mechanism 2 is installed on the outer side of the front end of the target piece group corresponding to the main frame 502 or the auxiliary frame 501. The soil retaining mechanism 2: a soil retaining frame mounting hole 202 is opened at the upper end of the soil retaining frame 205, and is installed in the soil retaining frame mounting sleeve 201 through bolts in cooperation with the soil retaining frame mounting hole 202. The soil retaining frame mounting sleeve 201 is fixed on the main frame 502 or the auxiliary frame 501, and a soil retaining plate 204 is installed on the soil retaining shaft 203 at the lower end of the soil retaining frame 205 through a bearing; d. A traction frame connecting plate 9 is fixedly installed under the crossbeam at the front end of the main frame 502, and the traction beam 8 is installed on the traction frame connecting plate 9 through the traction shaft 10; e. A traction beam damping mechanism 7 is installed on the main frame 502 and the traction beam 8. The traction beam damping mechanism 7 includes: a traction upper baffle 702 and a traction lower baffle 705 are fixedly installed on the upper and lower ends of a traction rod 706, the bottom end of the traction rod 706 is installed on a traction beam axle seat 708 through a traction rod shaft 707, the traction beam axle seat 708 is fixedly installed on the traction beam 8, a traction slider 703 is sleeved on the traction rod 706 between the traction upper baffle 702 and the traction lower baffle 705, an upper damping spring 710 and a lower damping spring 704 are sleeved on the traction rod 706 between the traction upper baffle 702 and the traction slider 703 and between the traction lower baffle 705 and the traction slider 703, the traction slider 703 is installed on the main frame axle seat 701 through a slider shaft 709, and the main frame axle seat 701 is fixed on the main frame 502; f. A soil crushing and suppressing mechanism 1 is installed at the tail end of the main frame 502 and the auxiliary frame 501. The soil crushing and suppressing mechanism 1: the lower end of the narrow gap section of the soil covering bracket 108 is installed on the telescopic rod shaft seat 112 at the bottom end of the telescopic rod 103 through the lower angle shaft 107, and a spring stopper sleeve 104 is sleeved on the upper part of the telescopic rod 103. A buffer spring 105 is sleeved on the telescopic rod 103 between the spring stopper sleeve 104 and the telescopic rod shaft seat 112. A rear shaft sleeve 111 is fixed on the side wall of the spring stopper sleeve 104, and the rear shaft sleeve 111 is sleeved on the rear angle shaft 110. The rear angle shaft 110 is installed at the rear end of the arc arm 102. The front of the arc arm 102 is connected to the upper end of the narrow gap section of the soil covering bracket 108 through the front angle shaft 109. The front end of the arc arm 102 is fixedly installed with a rack mounting seat 101, and the rack mounting seat 101 is installed on the tail crossbeam of the main frame 502 or the auxiliary frame 501.

2. The conservation tillage strip tillage machine according to claim 1, characterized in that: The rake blade mechanism 3 is suspended on the rake blade cross beam 308, one end of the rake blade cross beam 308 is installed on the longitudinal beam on one side of the frame 5 through the cross beam shaft 309, and the other end extends out of the longitudinal beam on the other side of the frame 5, and an angle adjustment pin 307 is installed at the extended portion, the angle adjustment pin 307 is placed in the angle adjustment arc groove 305, and is clamped by the clamping cap at the top, the angle adjustment arc groove 305 is opened on the adjustment plate 306, and the adjustment plate 306 is fixed on the frame 5.

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