CN214257082U - Hydraulic turnover plow with deep scarification function - Google Patents

Abstract

The utility model discloses a hydraulic pressure turnover plow with deep scarification function, which comprises a plow base plate I, a plow base plate II, a base plate support sleeve, a plow column clamping plate I, a plow column clamping plate II, a plow column I, a plow column II, a small plow assembly and a plow piece assembly, wherein the plow base plate I and the plow base plate II are connected through the base plate support sleeve; the first plough column and the two ends of the plough column are connected with the subsoiler, the subsoiler is provided with the subsoiler, and the tractor can complete the soil turning, the straw burying and the subsoiling of the plough bottom layer at one time, so that the number of times of the tractor entering the ground is reduced, the operation efficiency is high, and resources are saved; the deep loosening resistance is small, and the requirement on the traction force of the tractor is low.

Description

Hydraulic turnover plow with deep scarification function

Technical Field

The utility model belongs to the technical field of agricultural machine, specifically speaking, the utility model relates to a hydraulic pressure turnover plow that possesses dark pine function.

Background

The hydraulic turnover plow comprises a suspension bracket, a turnover oil cylinder, a non-return mechanism, a land wheel mechanism, a plow frame and a plow body, wherein the forward and reverse plow bodies on the plow frame are driven to do vertical turnover movement through the extension of a piston rod in the oil cylinder, and are alternately replaced to a working position along with the reciprocating of a tractor, so that the hydraulic turnover plow is mainly applied to agricultural soil turning and soil crushing.

The subsoiler is a tillage machine matched with a high-horsepower tractor, and is mainly used for mechanized tillage of inter-row or omnibearing deep soil tillage. The method is used for breaking the plough bottom layer, recovering the plough layer structure of the soil, improving the water storage and soil moisture preservation capability of the soil, eliminating part of weeds, reducing plant diseases and insect pests, leveling the ground surface, improving the standard of agricultural mechanized operation and the like.

The existing cultivation mode is that a hydraulic turnover plow is adopted to dig and turn soil on the land, and then a subsoiler is used for breaking the plough bottom layer. The two mechanical independent operation defects are as follows:

firstly, the method comprises the following steps: the tractor needs to enter the land twice, the operation efficiency is low, and the resources are wasted;

secondly, the method comprises the following steps: the subsoiling shovel of the subsoiler gradually enters the soil to a preset depth from the ground surface by means of self weight, the subsoiling depth is generally 30-40cm, the subsoiling resistance is large, and the requirement on the traction force of the tractor is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hydraulic pressure turnover plow that possesses dark pine function to solve the problem that exists among the above-mentioned background art.

In order to realize the purpose, the utility model discloses the technical scheme who takes does: a hydraulic turnover plow with a deep loosening function comprises a plow base plate I, a plow base plate II, base plate supporting sleeves, a plow column clamping plate I, a plow column clamping plate II, a plow column I, a plow column II, a small plow assembly and a plow blade assembly, wherein the plow base plate I and the plow base plate II are connected through the base plate supporting sleeves; the two ends of the first plough column and the two ends of the plough column are connected with a subsoiling shovel, and subsoiling pieces are arranged on the subsoiling shovel.

Preferably, a clamping plate spacing sleeve is arranged between the first plough column clamping plate and the second plough column clamping plate.

Preferably, the small plough component comprises a small plough column and a small plough head, the small plough column is fixedly connected with the first plough base plate and the second plough base plate, the number of the small plough heads is two, the two small plough heads are respectively and fixedly connected with the end part of the small plough column, and the height position of the small plough head on the small plough column is adjusted according to the height of the straws.

Preferably, the plough piece subassembly includes plough point board, plough support extension board, holds in the palm arc board, side sword, plough subplate, plough point, coulter and arc board, plough support extension board one end and plough point board fastening connection, in addition one end and support arc board fastening connection, the side sword is connected with the side fastening of plough point board front end, plough subplate and the side fastening of plough point board rear end are connected, plough point and support arc board front end fastening connection, plough sword and support arc board rear end fastening connection, arc board and support arc board fastening connection.

Preferably, hold in the palm the arc board from last to down in proper order fastening connection have last plough piece one, go up plough piece two, go up plough piece three and go up plough piece four, there is the support foundry goods through screw fastening connection on plough post one and the plough post two, wear to be equipped with the pull rod plug screw on the support foundry goods, it is equipped with short adjustment screw thread subassembly, long adjustment screw thread subassembly and strut fagging respectively to hold in the palm the arc board back, short adjustment screw thread subassembly one end is articulated with pull rod plug screw upper end, and one end strut fagging is articulated in addition, long adjustment screw thread subassembly one end is articulated with pull rod plug screw lower extreme, and one end strut fagging is articulated in addition, the strut fagging passes through strut branch and is connected with last plough piece one, last plough piece two, last plough piece three and last plough piece four respectively.

Preferably, the plough point, the coulter, the arc plate, the arc supporting plate, the upper plough piece I, the upper plough piece II, the upper plough piece III and the upper plough piece IV are spliced together to form a soil turning curved surface.

Preferably, short adjusting thread subassembly includes right-handed pole one, left-handed pole one and short thread bush, a dextrorotation pole tip is articulated with the strut fagging, a levorotation pole tip is articulated with pull rod plug screw upper end, short thread bush both ends are connected with dextrorotation pole one and levorotation pole one through the screw pair respectively.

Preferably, long adjustment threaded component includes two right-handed poles, two left-handed poles and long thread bush, two tip of right-handed poles are articulated with the strut fagging, two tip of left-handed poles are articulated with pull rod plug screw upper end, long thread bush both ends are connected with two right-handed poles and two left-handed poles through the screw pair respectively.

The beneficial effect of adopting above technical scheme is:

1. according to the hydraulic turnover plow with the deep scarification function, the small plow assembly is fixedly connected with the front ends of the first plow base plate and the second plow base plate, and the two plow blade assemblies are respectively connected with the two ends of the first plow column and the two ends of the plow column, so that the soil turning operation is realized; the two ends of the first plough column and the two ends of the plough column are connected with a subsoiling shovel, and subsoiling pieces are arranged on the subsoiling shovel.

Firstly, the tractor can complete the operation of turning soil, turning over and burying straws and the operation of deep scarification of the plough bottom layer at one time, thereby reducing the number of times of the tractor entering the ground, having high operation efficiency and saving resources.

Secondly, the soil turning depth is generally 20-30cm, and thus, the soil turning depth can not be too deep, for example, the soil turning depth is 30cm, then the deep loosening operation only needs about 10cm, and from the aspect of the deep loosening operation, the resistance of 0-30cm is saved, so that the deep loosening resistance is small, and the requirement on the traction force of the tractor is low.

2. And a clamping plate spacing sleeve is arranged between the first plough post clamping plate and the second plough post clamping plate, so that the structural stability of stress after the first plough post clamping plate and the second plough post clamping plate are fixedly connected with the first plough post and the second plough post is ensured.

The small plough component comprises a small plough column and two small ploughshare heads, the small plough column is fixedly connected with a first plough base plate and a second plough base plate, the number of the small ploughshare heads is two, the two small ploughshare heads are respectively fixedly connected with the end part of the small plough column, the height position of the small ploughshare heads on the small plough column is adjusted according to the height of straws, the straws which extend out of the earth surface and are longer are firstly pushed into a trench which is used for turning soil in the previous time through the small ploughshare heads, then the straws are turned over by the plough blade component in the back to be covered with the soil, and the straws are completely buried and covered.

The plough piece subassembly includes plough point board, plough support extension board, support arc board, side sword, plough subplate, plough point, coulter and arc board, plough support extension board one end and plough point board fastening connection, in addition one end and support arc board fastening connection, the side sword is connected with the side fastening of plough point board front end, the side fastening connection of plough subplate and plough point board rear end, plough point and support arc board front end fastening connection, plough sword and support arc board rear end fastening connection, arc board and support arc board fastening connection have formed the fixed part of cutting soil and digging.

The arc supporting plate is sequentially and tightly connected with a first upper plough piece, a second upper plough piece, a third upper plough piece and a fourth upper plough piece from top to bottom, the first plough post and the second plough post are fixedly connected with a support casting through screws, a pull rod screw pin penetrates through the support casting, the back of the arc supporting plate is respectively provided with a short adjusting screw thread component, a long adjusting screw thread component and a strut supporting plate, one end of the short adjusting screw thread component is hinged with the upper end of the pull rod screw pin, the other end of the short adjusting screw thread component is hinged with the strut supporting plate, one end of the long adjusting screw thread component is hinged with the lower end of the pull rod screw pin, the other end of the long adjusting screw thread component is hinged with the strut supporting plate, the strut supporting plate is respectively connected with the first upper plough piece, the second upper plough piece, the third upper plough piece and the fourth upper plough piece through strut supporting rods, the positions of the strut supporting plates are changed through the adjustment of the lengths of the short adjusting screw thread component and the long adjusting screw thread component, and the inclined positions of the first upper plough piece, the second upper plough piece, the third upper plough piece and the fourth upper plough piece are adjusted, thereby realizing the change of the soil turning effect.

The plough point, the coulter, the arc plate, the arc supporting plate, the upper plough piece I, the upper plough piece II, the upper plough piece III and the upper plough piece IV are spliced together to form a soil turning curved surface, the soil turning curved surface is large, and the soil turning effect is good.

Drawings

FIG. 1 is a first assembly view of the hydraulic turn plow with subsoiling function of the present invention;

FIG. 2 is a second assembly view of the hydraulic turn plow with subsoiling function of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at position A;

FIG. 4 is a first plow blade assembly view;

FIG. 5 is a second plow blade assembly view;

wherein:

1. a plough base plate I; 2. a plough base plate II; 3. a seat plate support sleeve; 4. a plough column clamp plate I; 5. a plough post clamping plate II; 6. a plough post I; 7. a second plough column; 8. a mini-plow assembly; 9. a plow blade assembly; 10. a subsoiling shovel; 11. deep loosening;

40. a splint spacer sleeve;

80. a small plough column; 81. a small plowshare;

90. ploughing; 91. a plough support plate; 92. an arc supporting plate; 93. side cutting; 94. a plough subplate; 95. ploughing; 96. a coulter; 97. an arc plate; 98. a first plough blade is arranged; 99. a second plough blade is arranged; 100. a third plough piece is arranged; 101. a fourth plough blade is arranged; 102. supporting a casting; 103. a pull rod screw pin; 104. a short adjustment screw assembly; 105. a long adjustment threaded component; 106. a strut supporting plate; 107. a strut of the strut;

104-1, a right-handed rod I; 104-2, a first left-handed rod; 104-3, short thread sleeve;

105-1, a right rotating rod II; 105-2, a second left-handed rod; 105-3, long thread sleeve.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation.

As shown in fig. 1 to 5, the utility model relates to a hydraulic pressure turnover plow with deep scarification function, a tractor works once, namely, the turning over and burying of the straw are finished, and the deep scarification of the plough bottom layer is finished, thereby reducing the ground entering times of the tractor, having high working efficiency and saving resources; the soil turning depth can not be too deep, for example, the soil is turned to 30cm, then the deep scarification operation of the deep scarification piece 11 only needs about 10cm, and in the deep scarification operation, the resistance of 0-30cm is saved, so that the deep scarification resistance is small, and the requirement on the traction force of the tractor is low.

Specifically, as shown in fig. 1 to 5, the plough base plate comprises a plough base plate I1, a plough base plate II 2, a base plate support sleeve 3, a plough column clamping plate I4, a plough column clamping plate II 5, a plough column I6, a plough column II 7, a small plough component 8 and a plough blade component 9, wherein the plough base plate I1 and the plough base plate II 2 are connected through the base plate support sleeve 3, the plough column clamping plate I4 is fixedly connected with the plough base plate I1 and the plough base plate II 2, the plough column clamping plate II 5 is fixedly connected with the plough column clamping plate I4, the plough column I6 and the plough column II 7 are respectively inserted between the plough column clamping plate I4 and the plough column clamping plate II 5 and are fixedly connected with the plough column clamping plate I4 and the plough column clamping plate II 5, the small plough component 8 is fixedly connected with the front ends of the plough base plate I1 and the plough base plate II 2, and the plough blade component 9 is provided with two parts and respectively connected with the ends of the plough column I6 and the plough column II 7; the end parts of the first plough column 6 and the second plough column 7 are connected with a subsoiler 10, and a subsoiling sheet 11 is arranged on the subsoiler 10.

And a clamping plate spacing sleeve 40 is arranged between the first plough post clamping plate 4 and the second plough post clamping plate 5.

Little plough subassembly 8 includes little plow standard 80 and little ploughshare 81, little plow standard 80 and plough bedplate one 1 and two 2 fastening connection of plough bedplate, little ploughshare 81 is equipped with two, and respectively with little plow standard 80 tip fastening connection, and the high position of little ploughshare 81 on little plow standard 80 is according to the straw altitude mixture control.

The plough piece component 9 comprises a plough point plate 90, a plough support plate 91, a support arc plate 92, a side cutter 93, a plough auxiliary plate 94, a plough point 95, a plough cutter 96 and an arc plate 97, wherein the plough support plate 91 is fixedly connected with one end of the plough point plate 90, the other end of the plough support plate 91 is fixedly connected with the support arc plate 92, the side cutter 93 is fixedly connected with the front end side face of the plough point plate 90, the plough auxiliary plate 94 is fixedly connected with the rear end side face of the plough point plate 90, the plough point 95 is fixedly connected with the front end of the support arc plate 92, the plough cutter 96 is fixedly connected with the rear end of the support arc plate 92, and the arc plate 97 is fixedly connected with the support arc plate 92.

Hold in the palm arc board 92 from last to having in proper order fastening connection with last plough piece 98, last plough piece two 99, go up plough piece three 100 and last plough piece four 101, there is support foundry goods 102 through screw fastening connection on plough post 6 and the plough post two 7, wear to be equipped with pull rod bolt 103 on the support foundry goods 102, hold in the palm the arc board 92 back and be equipped with short adjustment screw assembly 104, long adjustment screw assembly 105 and strut fagging 106 respectively, short adjustment screw assembly 104 one end is articulated with pull rod bolt 103 upper end, and one end strut fagging 106 is articulated in addition, long adjustment screw assembly 105 one end is articulated with pull rod bolt 103 lower extreme, and one end strut fagging 106 is articulated in addition, strut fagging 106 passes through strut branch 107 and is connected with last plough piece one 98, last plough piece two 99, last plough piece three 100 and last plough piece four 101 respectively.

The plough point 95, the coulter 96, the arc plate 97, the arc supporting plate 92, the first upper plough piece 98, the second upper plough piece 99, the third upper plough piece 100 and the fourth upper plough piece 101 are spliced together to form a soil turning curved surface.

The short adjusting threaded component 104 comprises a right rotating rod I104-1, a left rotating rod I104-2 and a short threaded sleeve 104-3, the end part of the right rotating rod I104-1 is hinged with a strut supporting plate 106, the end part of the left rotating rod I104-2 is hinged with the upper end of a pull rod screw pin 103, and two ends of the short threaded sleeve 104-3 are respectively connected with the right rotating rod I104-1 and the left rotating rod I104-2 through screw pairs.

The long adjusting threaded component 105 comprises a right rotating rod II 105-1, a left rotating rod II 105-2 and a long threaded sleeve 105-3, the end part of the right rotating rod II 105-1 is hinged with a strut supporting plate 106, the end part of the left rotating rod II 105-2 is hinged with the upper end of a pull rod screw pin 103, and two ends of the long threaded sleeve 105-3 are respectively connected with the right rotating rod II 105-1 and the left rotating rod II 105-2 through screw pairs.

The following specific working modes are illustrated by specific examples:

example 1:

according to the hydraulic turnover plow with the deep scarification function, the small plow assembly 8 is fixedly connected with the front ends of the plow base plate I1 and the plow base plate II 2, and the two plow blade assemblies 9 are respectively connected with the end parts of the plow standard I6 and the plow standard II 7, so that the soil turning operation is realized; the end parts of the first plough column 6 and the second plough column 7 are connected with a subsoiler 10, and a subsoiling sheet 11 is arranged on the subsoiler 10.

Firstly, the tractor can complete the operation of turning soil, turning over and burying straws and the operation of deep scarification of the plough bottom layer at one time, thereby reducing the number of times of the tractor entering the ground, having high operation efficiency and saving resources.

Secondly, the soil turning depth is generally 20-30cm, and thus the soil turning depth can not be too deep, for example, the soil turning depth is 30cm, then the deep scarification operation of the deep scarification piece 11 only needs about 10cm, and from the aspect of the deep scarification operation, the resistance of 0-30cm is saved, so that the deep scarification resistance is small, and the requirement on the traction force of the tractor is low.

Example 2:

on the basis of the embodiment 1, a clamp plate spacing sleeve 40 is arranged between the first plough post clamp plate 4 and the second plough post clamp plate 5, so that the structural stability of stress after the first plough post clamp plate 4 and the second plough post clamp plate 5 are fixedly connected with the first plough post 6 and the second plough post 7 is ensured.

Little plough subassembly 8 includes little plow standard 80 and little ploughshare 81, little plow standard 80 and plough bedplate one 1 and two 2 fastening connections of plough bedplate, little ploughshare 81 is equipped with two, and respectively with little plough standard 80 tip fastening connection, and the height position of little ploughshare 81 on little plow standard 80 is according to the high regulation of straw, pushes down the longer straw that stretches out the earth's surface earlier in the trench of the preceding trip native through little ploughshare 81, then is turned over by the plough piece subassembly at back and is covered with soil, has guaranteed that the straw is covered by landfill completely.

Example 3:

the plough piece component 9 comprises a plough point plate 90, a plough support plate 91, a support arc plate 92, a side cutter 93, a plough auxiliary plate 94, a plough point 95, a plough cutter 96 and an arc plate 97, one end of the plough support plate 91 is fixedly connected with the plough point plate 90, the other end of the plough support plate is fixedly connected with the support arc plate 92, the side cutter 93 is fixedly connected with the front end side face of the plough point plate 90, the plough auxiliary plate 94 is fixedly connected with the rear end side face of the plough point plate 90, the plough point 95 is fixedly connected with the front end of the support arc plate 92, the plough cutter 96 is fixedly connected with the rear end of the support arc plate 92, the arc plate 97 is fixedly connected with the support arc plate 92, and a fixed part for cutting and turning soil is formed.

The arc supporting plate 92 is sequentially and fixedly connected with a first upper plough piece 98, a second upper plough piece 99, a third upper plough piece 100 and a fourth upper plough piece 101 from top to bottom, a first plough column 6 and a second plough column 7 are fixedly connected with a support casting 102 through screws, a pull rod screw pin 103 penetrates through the support casting 102, a short adjusting screw component 104, a long adjusting screw component 105 and a strut supporting plate 106 are respectively arranged on the back of the arc supporting plate 92, one end of the short adjusting screw component 104 is hinged with the upper end of the pull rod screw pin 103, the other end of the short adjusting screw component 106 is hinged with the strut supporting plate 106, one end of the long adjusting screw component 105 is hinged with the lower end of the pull rod screw pin 103, the other end of the strut supporting plate 106 is hinged, the strut supporting plate 106 is respectively connected with the first upper plough piece 98, the second upper plough piece 99, the third upper plough piece 100 and the fourth upper plough piece 101 through strut supporting rods 107, and the adjustment of the lengths of the short adjusting screw component 104, the position of the strut supporting plate 106 is changed to realize the adjustment of the inclined positions of the first upper plough blade 98, the second upper plough blade 99, the third upper plough blade 100 and the fourth upper plough blade 101, thereby realizing the change of the soil turning effect.

The plough tip 95, the coulter 96, the arc plate 97, the arc supporting plate 92, the first upper plough piece 98, the second upper plough piece 99, the third upper plough piece 100 and the fourth upper plough piece 101 are spliced together to form a soil turning curved surface, and the soil turning curved surface is large and good in soil turning effect.

The present invention has been described in detail with reference to the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments, but is intended to cover various insubstantial modifications, including those made by the method and technical solutions of the present invention; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.

Claims (8)

1. The utility model provides a hydraulic pressure turnover plow that possesses dark pine function which characterized in that: comprises a plough seat plate I (1), a plough seat plate II (2), a seat plate support sleeve (3), a plough post clamp plate I (4), a plough post clamp plate II (5), a plough post I (6), a plough post II (7), a small plough component (8) and a plough blade component (9), the plough base plate I (1) and the plough base plate II (2) are connected through a base plate support sleeve (3), the first plough column clamping plate (4) is fixedly connected with the first plough base plate (1) and the second plough base plate (2), the second plough column clamping plate (5) is fixedly connected with the first plough column clamping plate (4), the first plough column (6) and the second plough column (7) are respectively inserted between the first plough column clamping plate (4) and the second plough column clamping plate (5), and is fixedly connected with a first plough column clamping plate (4) and a second plough column clamping plate (5), the small plough component (8) is fixedly connected with the front ends of the first plough base plate (1) and the second plough base plate (2), the two plough blade assemblies (9) are respectively connected with the end parts of the first plough column (6) and the second plough column (7); the end parts of the first plough column (6) and the second plough column (7) are connected with a subsoiling shovel (10), and a subsoiling sheet (11) is arranged on the subsoiling shovel (10).

2. The hydraulic reversible plow with subsoiling function of claim 1, characterized in that: and a clamping plate spacing sleeve (40) is arranged between the plough post clamping plate I (4) and the plough post clamping plate II (5).

3. The hydraulic reversible plow with subsoiling function of claim 1, characterized in that: little plough subassembly (8) are including little plow standard (80) and little ploughshare (81), little plow standard (80) and plow base board (1) and plow base board two (2) fastening connection, little ploughshare (81) are equipped with two, and respectively with little plow standard (80) tip fastening connection, and little ploughshare (81) height position on little plow standard (80) is according to straw height control.

4. The hydraulic reversible plow with subsoiling function of claim 1, characterized in that: plough piece subassembly (9) are including plough point board (90), plough support extension board (91), support arc board (92), side sword (93), plough subplate (94), plough point (95), plough sword (96) and arc board (97), plough support extension board (91) one end and plough point board (90) fastening connection, one end and support arc board (92) fastening connection in addition, side sword (93) and plough point board (90) front end side fastening connection, plough subplate (94) and plough point board (90) rear end side fastening connection, plough point (95) and support arc board (92) front end fastening connection, plough sword (96) and support arc board (92) rear end fastening connection, arc board (97) and support arc board (92) fastening connection.

5. The hydraulic reversible plow with subsoiling function of claim 4, characterized in that: hold in the palm arc board (92) from last to having in proper order fastening connection with plough piece one (98), go up plough piece two (99), go up plough piece three (100) and plough piece four (101), there are support foundry goods (102) through screw fastening connection on plough post one (6) and the plough post two (7), wear to be equipped with pull rod plug screw (103) on the support foundry goods (102), hold in the palm arc board (92) the back and be equipped with short adjustment screw assembly (104), long adjustment screw assembly (105) and strut fagging (106) respectively, short adjustment screw assembly (104) one end is articulated with pull rod plug screw (103) upper end, and one end strut fagging (106) is articulated in addition, long adjustment screw assembly (105) one end is articulated with pull rod plug screw (103) lower extreme, and one end strut fagging (106) are articulated in addition, strut fagging (106) pass through strut branch (107) respectively with last plough piece one (98), The upper plough piece II (99), the upper plough piece III (100) and the upper plough piece IV (101) are connected.

6. The hydraulic reversible plow with subsoiling function of claim 5, characterized in that: the plough point (95), the coulter (96), the arc plate (97), the arc supporting plate (92), the upper plough piece I (98), the upper plough piece II (99), the upper plough piece III (100) and the upper plough piece IV (101) are spliced together to form a soil turning curved surface.

7. The hydraulic reversible plow with subsoiling function of claim 5, characterized in that: the short adjusting threaded component (104) comprises a first right-handed rod (104-1), a first left-handed rod (104-2) and a short threaded sleeve (104-3), the end part of the first right-handed rod (104-1) is hinged to a strut supporting plate (106), the end part of the first left-handed rod (104-2) is hinged to the upper end of a pull rod threaded pin (103), and two ends of the short threaded sleeve (104-3) are connected with the first right-handed rod (104-1) and the first left-handed rod (104-2) through screw pairs respectively.

8. The hydraulic reversible plow with subsoiling function of claim 5, characterized in that: the long adjusting threaded component (105) comprises a right rotating rod II (105-1), a left rotating rod II (105-2) and a long threaded sleeve (105-3), the end part of the right rotating rod II (105-1) is hinged with a strut supporting plate (106), the end part of the left rotating rod II (105-2) is hinged with the upper end of a pull rod threaded pin (103), and two ends of the long threaded sleeve (105-3) are respectively connected with the right rotating rod II (105-1) and the left rotating rod II (105-2) through a screw pair.

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