Safety traction mechanism for steel bar straightening and cutting machine

Abstract

The invention relates to the technical field of steel bar straightening traction, and discloses a safety traction mechanism for a steel bar straightening cut-off machine, which comprises a working panel, and a support frame is slidably mounted on the surface of the working panel; the traction wheels are installed on the surface of the supporting frame in a sliding mode, the number of the traction wheels is multiple, and the traction wheels are symmetrically distributed; the clamping mechanism is arranged on the surface of the supporting frame, reinforcing steel bars with different diameters and thicknesses can be clamped and pulled through the clamping mechanism, the situation that the straightening effect is not ideal during conveying due to the fact that the reinforcing steel bars are too thin and cannot be completely attached to the traction mechanism is avoided, and the traction wheel can be adjusted according to the diameters of the reinforcing steel bars; the reinforcing steel bar straightening device can adjust the distance between the traction wheels when the reinforcing steel bars with too large diameters penetrate through the traction wheels, so that the reinforcing steel bars can be completely attached to the traction wheels when penetrating through the traction wheels, and the straightening effect of the reinforcing steel bars is prevented from being influenced.

Description

Technical Field

[0001] The invention relates to the technical field of steel bar straightening and traction, in particular to a safety traction mechanism for a steel bar straightening and cutting machine. Background Art

[0002] Straightening machine, also called straightening and cutting machine. Straightening and cutting machine is a kind of straightening equipment. Straightening machine is one of the steel bar processing machines, used for straightening and cutting steel bars with a diameter of less than 14 mm. The cutting length can be customized according to customer requirements. It can straighten and cut stainless steel wire, aluminum wire, cold-drawn wire, plastic-coated steel wire, etc. First, the steel bar to be straightened is passed through the upper and lower traction wheels (3) to perform preliminary traction and straightening. Then, the motor increases the speed through the belt transmission to make the straightening cylinder rotate at a high speed. The steel bar passing through the straightening cylinder is straightened, and the rust on the surface of the steel bar is removed by the straightening die. The motor drives two conveying rollers through another pair of speed reduction belts and a gear reduction box, on the one hand, to pull the steel bar forward, and on the other hand, drives the crank wheel to make the hammer head move up and down. When the steel bar is straightened to the predetermined length, the hammer head hits the upper knife holder to cut the steel bar. When the cut steel bar falls into the receiving rack, the knife holder returns to its original position due to the action of the spring, completing a cycle.

[0003] When the existing steel bars pass through the traction wheel for preliminary straightening, the distance between the two traction wheels is fixed, and the size of the groove on the surface of the traction wheel for clamping the steel bars is also fixed. For steel bars with a diameter smaller than the diameter of the groove on the surface of the traction wheel, they cannot fit into the transmission opening between the traction wheels during transmission, and the straightening effect during transmission is not ideal. However, for thicker steel bars, the fixed spacing between the two traction wheels squeezes the steel bars during transmission, which easily increases the transmission load and flattens the steel bars, which is not conducive to use. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned background technology, the present invention provides a technical solution for a safety traction mechanism for a steel bar straightening and cutting machine, which can clamp and pull steel bars of different diameters to avoid the situation where the steel bars are too thin and cannot be fully fitted with the traction wheel during transmission, resulting in unsatisfactory straightening effect during transmission, thereby solving the problems raised in the above-mentioned background technology.

[0005] The present invention provides the following technical solutions: a safety traction mechanism for a steel bar straightening and cutting machine, comprising a working panel, a support frame is slidably mounted on the surface of the working panel; a traction wheel, a traction wheel is slidably mounted on the surface of the support frame, and the number of the traction wheels is multiple and symmetrically distributed; a clamping mechanism, a clamping mechanism is provided on the surface of the support frame, and the clamping mechanism can clamp and pull steel bars of different diameters and thicknesses, so as to avoid that the steel bars are too thin and cannot be completely fitted with the traction mechanism during transmission, resulting in unsatisfactory straightening effect during transmission, and at the same time, prevent the steel bars from being too thick and not fully engaged and slipping.

[0006] As a preferred technical solution of the present invention, the clamping mechanism includes gear I, on the surface of the traction wheel, gear I is rotatably mounted; a fixed ring, on the surface of the traction wheel, a fixed ring is rotatably connected, and the fixed ring is opposite to the position where gear I is installed on the surface of the traction wheel; a traction plate, on the surface of the fixed ring, a reversible traction plate is sleeved; a connecting rod II, on the inner wall of the gear I, a connecting rod II is fixed, on the surface of the connecting rod II, a fixed shaft I and a fixed shaft II are fixed, and the gear I is rotatably mounted on the surface of the traction wheel through the fixed shaft II; an inner gear ring, on the gear I, an inner gear ring is fixed through the fixed shaft I; gear III, the inner ring of the inner gear ring is meshed with gear III, and the surface of the gear III is meshed with gear II; a support shaft, on the surface of the gear III, a support shaft is rotatably connected, and the gear III rotates through the support shaft Installed on the surface of the support frame, one end of the support shaft is slidably connected to one side of the support frame; a spiral column, a spiral column is fixed on the surface of the gear II and at the position that passes through the circular ring; a connecting shaft I, a connecting shaft I is fixed on the end of the spiral column, and the symmetrical traction wheels are connected through the connecting shaft I; a circular ring, the inner wall of the traction wheel is slidably connected to the circular ring through a fixed block II, the top of the fixed block II is fixed to the inner wall of the traction wheel, and the inner wall of the circular ring is inserted into the spiral column through the fixed block; a connecting rod III, a connecting rod III is rotated on the surface of the circular ring near the traction sheet; a connecting shaft II, a connecting shaft II passes through one side of the traction sheet, and one end of the connecting rod III is sleeved on the surface of the connecting shaft II; a gear rod, a gear rod is fixed on the surface of the working panel, and the gear rod is located on one side of the traction wheel and meshes with the surface of the gear I.

[0007] As a preferred technical solution of the present invention, a support rod is fixed at the bottom of the fixed block II, the bottom of the support rod is stuck in the spiral column and connected to the spiral column, and the traction wheel is supported and fixed by the support rod.

[0008] As a preferred technical solution of the present invention, a slide groove is provided on the front surface of the support frame, a plurality of tooth blocks are fixed to the slide groove, and a sliding block is slidably connected to the surface of the support frame.

[0009] As a preferred technical solution of the present invention, the position of the surface of gear II close to the support frame is fixed between a connecting block and a slider, the connecting block can rotate on the surface of gear II, the connecting block on the surface of gear II passes through the middle of the support frame, and the traction wheel slides on the surface of the support frame through the slider to be raised and lowered.

[0010] As a preferred technical solution of the present invention, a locking plate is rotatably connected at the relative position of the slider and the slide groove, and a long groove is opened on the surface of the locking plate, and the number of the long grooves is two. A connecting rod I is slidably connected to the surface of the slider, and one end of the connecting rod I passes through the long groove at the top of the locking plate and slides above the slider. A spring I is fixed on the top of the locking plate, and the bottom of the locking plate can engage with the tooth block inside the slide groove to fix the lifting distance of the traction wheel.

[0011] As a preferred technical solution of the present invention, a hinged rod is hinged on the surface of the slider, a fixed block I is fixed in the middle of the hinged rod, a push rod is slidably connected inside the fixed block I, connecting plates are fixed on the upper and lower surfaces of the push rod, the top of the connecting plate is fixed to one end of the connecting rod I, and a spring II is connected between the inside of the fixed block I and the push rod.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Through the setting of the traction plate, gear I and spiral column, the traction wheel can be adjusted according to the diameter of the steel bar to avoid the steel bar being too thin and unable to fit completely with the traction wheel during transmission, affecting the straightening effect. At the same time, the distance between the traction wheels can be adjusted for the steel bar with a diameter that is too thick when passing through, so that the steel bar can also fit completely with the traction wheel when passing through, avoiding affecting the straightening effect of the steel bar.

[0014] 2. By combining with the above, when there is no space for the thin steel bars to move when adjusting the spacing, the size of the opening through which they pass can be adjusted by adjusting the traction piece. For steel bars with thicker diameters, the spacing between the traction wheels can be directly adjusted, which is convenient for adjustment according to the diameter of the steel bars and is suitable for straightening steel bars of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 For the present invention Figure 1 Partial structure diagram in ;

[0017] Figure 3 For the present invention Figure 1 Side view of the structure where the steel bars pass through;

[0018] Figure 4 For the present invention Figure 1 Structural diagram of the middle slider;

[0019] Figure 5 For the present invention Figure 1 The overall structure diagram between the two traction wheels;

[0020] Figure 6 For the present invention Figure 1 Structural diagram of the middle traction wheel;

[0021] Figure 7 For the present invention Figure 1 Rear view of the middle traction wheel;

[0022] Figure 8 For the present invention Figure 7 A schematic diagram of a portion of the structure of the middle traction wheel;

[0023] Fig. 9 For the present invention Figure 1 Structural diagram of the middle support frame.

[0024] In the figure: 1. working panel; 2. supporting frame; 201. fixing block Ⅰ; 202. connecting plate; 203. connecting rod Ⅰ; 204. sliding block; 205. hinged rod; 206. push rod; 208. slide groove; 209. locking plate; 210. spring Ⅰ; 3. traction wheel; 301. gear Ⅰ; 302. fixing ring; 303. connecting shaft Ⅰ; 304. traction plate 3041. connecting shaft Ⅱ; 305. inner gear ring; 306. gear Ⅱ; 308. supporting shaft; 309. connecting rod Ⅱ; 3091. fixing shaft Ⅰ; 3092. fixing shaft Ⅱ; 310. spiral column; 312. fixing block Ⅱ; 3121. supporting rod; 313. connecting rod Ⅲ; 314. gear Ⅲ; 315. plug shaft; 316. circular ring; 4. gear rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-7As shown, a safety traction mechanism for a steel bar straightening and cutting machine comprises a working panel 1, on the surface of which a support frame 2 is slidably mounted; a traction wheel 3, on the surface of which a traction wheel 3 is slidably mounted, and the number of traction wheels 3 is multiple and symmetrically distributed; a clamping mechanism, on the surface of the support frame 2 there is a clamping mechanism, through which steel bars of different diameters can be clamped and pulled, to avoid that the steel bar is too thin and cannot be completely attached to the traction wheel 3 during transmission, resulting in an unsatisfactory straightening effect during transmission, and at the same time, to prevent the steel bar from being too thick and not fully engaged and slipping; the clamping mechanism comprises a gear Ⅰ301, and the surface of the traction wheel 3 rotates A gear Ⅰ301 is installed; a fixed ring 302, the surface of the traction wheel 3 is rotatably connected with the fixed ring 302, and the fixed ring 302 is opposite to the position where the gear Ⅰ301 is installed on the surface of the traction wheel 3; a traction plate 304, the surface of the fixed ring 302 is covered with a reversible traction plate 304; a connecting rod Ⅱ309, the inner wall of the gear Ⅰ301 is fixed with a connecting rod Ⅱ309, the surface of the connecting rod Ⅱ309 is fixed with a fixed shaft Ⅰ3091 and a fixed shaft Ⅱ3092, and the gear Ⅰ301 is rotatably installed on the surface of the traction wheel 3 through the fixed shaft Ⅱ3092; an inner gear ring 305, the gear Ⅰ301 is fixed with an inner gear ring through the fixed shaft Ⅰ3091 305; gear III 314, the inner ring of the inner gear ring 305 is meshed with gear III 314, and the surface of gear III 314 is meshed with gear II 306; support shaft 308, the surface of gear III 314 is rotatably connected with support shaft 308, gear III 314 is rotatably mounted on the surface of support frame 2 through support shaft 308, and one end of support shaft 308 is slidably connected to one side of support frame 2; spiral column 310, the surface of gear II 306 and the position where the spiral column 310 passes through the circular ring 316 are fixed; connecting shaft I 303, the end of the spiral column 310 is fixed with connecting shaft I 303, and the symmetrical traction wheels 3 are all connected through connecting shaft I 303; circular ring 316, the inner wall of the traction wheel 3 is slidably connected with a ring 316 through a fixed block II 312, the top of the fixed block II 312 is fixed to the inner wall of the traction wheel 3, and the inner wall of the ring 316 is inserted into the spiral column 310 through the fixed block; a connecting rod III 313, the surface of the ring 316 is rotatably connected with a connecting rod III 313 near the traction plate 304; a connecting shaft II 3041, a connecting shaft II 3041 passes through one side of the traction plate 304, and one end of the connecting rod III 313 is sleeved on the surface of the connecting shaft II 3041; a gear rod 4, a gear rod 4 is fixed to the surface of the working panel 1, and the gear rod 4 is located on one side of the traction wheel 3 and meshes with the surface of the gear I 301.

[0027] During operation, by pressing the push rod 206, the fixed block I201 is driven to move toward the direction of the traction wheel 3 to expand the opening angle of the hinged rod 205. When the angle of the hinged rod 205 is opened, the slider 204 is pushed to move on the surface of the support frame 2. The lower slider 204 moves down on the surface of the support frame 2, and the upper slider 204 moves up, so that the spacing between the upper and lower symmetrical traction wheels 3 is adjusted according to the diameter of the steel bar. For steel bars with too thin diameters, the spacing between the upper and lower traction wheels 3 can be reduced. When the traction wheel 3 moves, the gear I301 is meshed with the toothed rod 4 through the gear I301 so that the gear I301 rotates on the surface of the traction wheel 3. When the gear I When 301 rotates, the inner gear ring 305 is driven to rotate in the same direction through the fixed shaft I 3091, and the inner gear ring 305 is meshed with the gear III 314 to drive the gear II 306 to rotate. The spiral column 310 rotates with the gear II 306 and pushes the ring 316 on the fixed block II 312 to move toward the traction piece 304 through the fixed block stuck inside the spiral column 310. The traction piece 304 is pushed to move on the surface of the fixed ring 302 toward the surface of the steel bar through the connecting rod III 313 so that the traction piece 304 is in contact with the surface of the steel bar, and then the moving distance of the traction wheel 3 on the surface of the support frame 2 is fixed by the angle opened by the hinged rod 205, as shown in FIG. Figure 3 As shown, the steel bar then passes through between the two traction pieces 304, and the friction between the steel bar and the traction piece 304 during forward transmission drives the traction piece 304 and the fixing ring 302 to rotate on the surface of the traction wheel 3; on the contrary, if the diameter of the steel bar is relatively thick, the spacing between the two traction wheels 3 can be increased, and the gear I 301 and the gear rod 4 are meshed, so that the inner gear ring 305, the gear II 306 and the gear III 314 rotate to drive the spiral column 310 to rotate, so that the circular ring 316 moves toward the direction of the hinge rod 205, and the connecting rod III 313 on the surface of the circular ring 316 pulls the traction piece 304 to flip toward the direction of the gear I 301, thereby increasing the opening through which the steel bar passes, and the traction wheel 3 can be adjusted according to the diameter of the steel bar to avoid the steel bar being too thin and not being able to fully fit with the traction wheel 3 during transmission, affecting the straightening effect, and at the same time, the spacing between the traction wheels 3 can be adjusted for the steel bar with a diameter that is too thick when passing through, so that the steel bar can also be fully fitted with the traction wheel 3 when passing through, thereby avoiding affecting the straightening effect of the steel bar.

[0028] As a specific embodiment of the present invention, a support rod 3121 is fixed at the bottom of the fixed block II 312, and the bottom of the support rod 3121 is stuck in the spiral column 310 and connected to the spiral column 310, and the traction wheel 3 is supported and fixed by the support rod 3121; a slide groove 208 is opened on the front surface of the support frame 2, and a plurality of tooth blocks are fixed to the slide groove 208, and a slider 204 is slidably connected to the surface of the support frame 2; the position of the surface of the gear II 306 close to the support frame 2 is fixed between the connecting block and the slider 204, and the connecting block can rotate on the surface of the gear II 306, and the connecting block on the surface of the gear II 306 runs through the middle of the support frame 2, and the traction wheel 3 slides on the surface of the support frame 2 through the slider 204 to be raised and lowered; a locking piece is rotatably connected to the relative position of the slider 204 and the slide groove 208 209, a long groove is provided on the surface of the locking plate 209, and the number of the long grooves is two. A connecting rod Ⅰ203 is slidably connected to the surface of the slider 204, and one end of the connecting rod Ⅰ203 passes through the long groove on the top of the locking plate 209 and slides above the slider 204. A spring Ⅰ210 is fixed on the top of the locking plate 209, and the bottom of the locking plate 209 can engage with the tooth block inside the slide groove 208 to fix the lifting distance of the traction wheel 3; a hinged rod 205 is hinged on the surface of the slider 204, and a fixed block Ⅰ201 is fixed to the middle of the hinged rod 205. A push rod 206 is slidably connected to the inside of the fixed block Ⅰ201, and a connecting plate 202 is fixed to the upper and lower surfaces of the push rod 206. The top of the connecting plate 202 is fixed to one end of the connecting rod Ⅰ203, and a spring Ⅱ is connected between the inside of the fixed block Ⅰ201 and the push rod 206.

[0029] When adjusting the spacing of the traction wheels 3, the slider 204 slides on the surface of the support frame 2. When the spacing of the traction wheels 3 needs to be adjusted, the push rod 206 can be pressed, and at the same time, the connecting rod I 203 moves in the direction of the slide groove 208 with the push of the push rod 206, pushing the top of the locking plate 209 so that the locking plate 209 rotates on the slider 204, and then moves to the upper side of the slider 204 through the long groove opened on the surface of the locking plate 209 to exit between the two tooth blocks, and then the slider 204 and the traction wheel 3 are moved freely on the surface of the support frame 2. When the traction wheel 3 moves to a suitable distance, the spring inside the fixing block I 201 is used to Ⅱ expansion deformation pushes the push rod 206 to move in the direction of exiting the fixed block Ⅰ201, and then the spring Ⅰ210 on the top of the lock plate 209 squeezes the lock plate 209 to rotate clockwise and get stuck in the tooth block inside the slide groove 208, thereby fixing the distance moved by the traction wheel 3. By combining with the above-mentioned specific embodiments, when there is no space for the adjustment of the spacing of the overly thin steel bars, the size of the opening through which the steel bars pass can be adjusted by adjusting the traction plate 304. For the steel bars with thicker diameters, the spacing of the traction wheel 3 can be directly adjusted, which is convenient for adjustment according to the diameter of the steel bars and is suitable for straightening steel bars of different thicknesses.

[0030] It should be noted that, in this article, relational terms such as first and, second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. At the same time, in the drawings of the present invention, the fill pattern is only for distinguishing layers, without any other limitation.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety traction mechanism for a steel bar straightening and cutting machine, comprising: A working panel (1), a support frame (2) being slidably mounted on the surface of the working panel (1); A traction wheel (3), the surface of the support frame (2) is slidably mounted with a traction wheel (3), and the traction wheels (3) are multiple and symmetrically distributed; The invention is characterized in that: a clamping mechanism is provided on the surface of the support frame (2), and the clamping mechanism can be used to clamp and pull steel bars of different diameters and thicknesses, so as to prevent the steel bars from being too thin and not being able to fit completely with the pulling mechanism during transmission, resulting in unsatisfactory straightening effect during transmission, and at the same time prevent the steel bars from being too thick and not being able to fit completely with the pulling mechanism, resulting in slipping.

2. A safety traction mechanism for a steel bar straightening and cutting machine according to claim 1, characterized in that: The clamping mechanism comprises a gear I (301), and the surface of the traction wheel (3) is rotatably mounted with the gear I (301); A fixing ring (302), the surface of the traction wheel (3) is rotatably connected with the fixing ring (302), and the fixing ring (302) is opposite to the position where the gear I (301) is installed on the surface of the traction wheel (3); A traction piece (304), wherein the surface of the fixing ring (302) is covered with a reversible traction piece (304); A connecting rod II (309), the inner wall of the gear I (301) is fixed with a connecting rod II (309), a fixed shaft I (3091) and a fixed shaft II (3092) are fixed on the surface of the connecting rod II (309), and the gear I (301) is rotatably mounted on the surface of the traction wheel (3) via the fixed shaft II (3092); An inner gear ring (305), the gear I (301) is fixed with the inner gear ring (305) via a fixed shaft I (3091); Gear III (314), the inner ring of the inner gear ring (305) is meshed with gear III (314), and the surface of the gear III (314) is meshed with gear II (306); A support shaft (308), the surface of the gear III (314) is rotatably connected to the support shaft (308), the gear III (314) is rotatably mounted on the surface of the support frame (2) through the support shaft (308), and one end of the support shaft (308) is slidably connected to one side of the support frame (2); A spiral column (310), the spiral column (310) is fixed on the surface of the gear II (306) and at a position penetrating the circular ring (316); A connecting shaft I (303), the end of the spiral column (310) is fixed with the connecting shaft I (303), and the symmetrical traction wheels (3) are all connected via the connecting shaft I (303); A circular ring (316), the inner wall of the traction wheel (3) is slidably connected with the circular ring (316) via a fixing block II (312), the top of the fixing block II (312) is fixed to the inner wall of the traction wheel (3), and the inner wall of the circular ring (316) is inserted into the interior of the spiral column (310) via the fixing block; A connecting rod III (313), wherein a connecting rod III (313) is rotatably arranged on the surface of the circular ring (316) near the traction piece (304); A connecting shaft II (3041), wherein one side of the traction piece (304) is penetrated by the connecting shaft II (3041), and one end of the connecting rod III (313) is sleeved on the surface of the connecting shaft II (3041); A gear rod (4), a gear rod (4) is fixed on the surface of the working panel (1), and the gear rod (4) is located on one side of the traction wheel (3) and meshes with the surface of the gear I (301).

3. A safety traction mechanism for a steel bar straightening and cutting machine according to claim 2, characterized in that: A support rod (3121) is fixed at the bottom of the fixing block II (312); the bottom of the support rod (3121) is clamped in the spiral column (310) and connected to the spiral column (310); the traction wheel (3) is supported and fixed by the support rod (3121).

4. A safety traction mechanism for a steel bar straightening and cutting machine according to claim 3, characterized in that: The front surface of the support frame (2) is provided with a slide groove (208), a plurality of tooth blocks are fixed to the slide groove (208), and the surface of the support frame (2) is slidably connected with a sliding block (204).

5. The safety traction mechanism for a steel bar straightening and cutting machine according to claim 2, characterized in that: The position of the surface of the gear II (306) close to the support frame (2) is fixed between a connecting block and a slider (204); the connecting block can rotate on the surface of the gear II (306); the connecting block on the surface of the gear II (306) passes through the middle of the support frame (2); and the traction wheel (3) slides on the surface of the support frame (2) through the slider (204) to be raised or lowered.

6. The safety traction mechanism for a steel bar straightening and cutting machine according to claim 3, characterized in that: A locking plate (209) is rotatably connected at the relative position between the slider (204) and the slide groove (208), and a long groove is provided on the surface of the locking plate (209). The number of the long grooves is two. A connecting rod I (203) is slidably connected to the surface of the slider (204), and one end of the connecting rod I (203) passes through the long groove at the top of the locking plate (209) and slides above the slider (204). A spring I (210) is fixed on the top of the locking plate (209), and the bottom of the locking plate (209) can engage with a tooth block inside the slide groove (208) to fix the lifting distance of the traction wheel (3).

7. A safety traction mechanism for a steel bar straightening and cutting machine according to claim 6, characterized in that: The surface of the slider (204) is hinged with a hinge rod (205), the middle of the hinge rod (205) is fixed with a fixed block I (201), the interior of the fixed block I (201) is slidably connected with a push rod (206), the upper and lower surfaces of the push rod (206) are fixed with connecting plates (202), the top of the connecting plate (202) is fixed to one end of the connecting rod I (203), and a spring II is connected between the interior of the fixed block I (201) and the push rod (206).

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