Anti-toppling device for balance arm of gantry crane

Abstract

The utility model relates to the technical field of gantry cranes, and discloses an anti-toppling device for a balance arm of a gantry crane, which comprises a suspension mechanism, two guide mechanisms and a connecting mechanism, and the two guide mechanisms are respectively arranged on two sides of the suspension mechanism; the guiding mechanism comprises a positioning frame, a guiding wheel, two positioning shafts and two fixing clamps, the guiding wheel is rotatably connected to the inner side wall of the positioning frame, the two positioning shafts are fixedly installed on the two sides of the guiding wheel respectively and rotatably connected to the outer wall of the positioning frame, and the two fixing clamps are slidably connected to the two sides of the positioning frame respectively. According to the anti-toppling device for the balance arm of the gantry lifting appliance, through cooperative arrangement of the guide wheel and the positioning shaft, the positioning shaft can be fixed by means of the fixing clamp in the process that a steel cable of the lifting appliance needs to be replaced, so that the guide wheel is driven to be fixed, the steel cable is prevented from sliding on the surface of the guide wheel, and the effect of fixing one end of a suspension mechanism is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gantry crane technical field, concretely is gantry crane balance arm anti -toppling device. BACKGROUND

[0002] Gantry crane is widely applied in modern industrial production, port loading and unloading and other fields, and is indispensable equipment for material handling operation, and the balance arm of gantry crane plays a key role in keeping the stability of the crane during hoisting and ensuring the safety and accurate hoisting of goods, however, during the actual use and maintenance of gantry crane, the balance arm and its supporting equipment expose many problems.

[0003] In the replacement link of gantry crane steel cable, the existing equipment lacks reliable auxiliary fixing device, as the steel cable bears the main tension of the suspension mechanism, when replacing one of the steel cables, the suspension mechanism will swing or tilt greatly due to uneven force, which not only increases the difficulty of operation of the staff, but also easily causes safety accidents, seriously threatens the life safety of the staff, and also may cause equipment damage, brings great economic loss. CONTENT OF THE UTILITY MODEL

[0004] (I) technical problem solved

[0005] In order to overcome the above defects of the prior art, the utility model provides a gantry crane balance arm anti-toppling device, which solves the problems in the prior art that:

[0006] Lack of reliable auxiliary fixing device, prone to swing or tilt greatly, increase the operation difficulty and safety of the staff.

[0007] (II) technical scheme

[0008] In order to achieve the above purpose, the utility model is realized by the following technical scheme: the gantry crane balance arm anti-toppling device comprises a suspension mechanism, two guide mechanisms and a connecting mechanism, wherein:

[0009] Two guide mechanisms are arranged on both sides of the suspension mechanism respectively;

[0010] The guide mechanism comprises a positioning frame, a guide wheel, two positioning shafts and two fixed clamps, the guide wheel is rotatably connected to the inner side wall of the positioning frame, the two positioning shafts are fixedly installed on both sides of the guide wheel respectively and rotatably connected to the outer wall of the positioning frame, the two fixed clamps are slidably connected to both sides of the positioning frame respectively, and the inner side wall of the fixed clamp is matched with the outer wall of the positioning shaft;

[0011] The connecting mechanism comprises four fixing seats, four supporting frames and four guide wheels, the four fixing seats are arranged above the two positioning frames respectively, the four supporting frames are arranged on the two sides of the four fixing seats respectively, and the four guide wheels are rotatably connected to the inner side walls of the four supporting frames respectively.

[0012] Optionally, the suspension mechanism comprises a cross beam, two adjusting seats and two hooks, the two adjusting seats are rotatably connected to the two sides of the bottom of the cross beam respectively, and the bottoms of the two adjusting seats are rotatably connected with the tops of the two hooks respectively.

[0013] Optionally, the guiding mechanism further comprises two guide plates and two guide grooves, the two guide plates are fixedly installed on the two sides of the outer surface of the positioning frame respectively, the two guide grooves are formed on the outer surfaces of the two guide plates respectively, and the inner side walls of the two guide grooves are slidably connected with the outer surfaces of the two fixing clamps respectively.

[0014] Optionally, the guiding mechanism further comprises two fixing rods and two fixing holes, the two fixing rods are threadedly arranged on the outer walls of the two fixing clamps respectively, the two fixing holes are formed on the outer surface of the positioning frame and located on one side of the positioning shaft, and the ends of the fixing rods, which are arranged outside the fixing clamps, are inserted into the inner side walls of the fixing holes.

[0015] Optionally, the connecting mechanism further comprises a mounting plate and a plurality of guide holes, the mounting plate is fixedly installed on the middle of the top of the cross beam, and the plurality of guide holes are formed on the outer surfaces of the four fixing seats.

[0016] Optionally, the connecting mechanism further comprises a plurality of connecting bolts, the plurality of connecting bolts are threadedly arranged on the outer walls of a part of the supporting frames, and the ends of the plurality of connecting bolts, which are arranged outside the part of the supporting frames, are threadedly connected with the outer walls of the other part of the supporting frames.

[0017] Optionally, the inner side wall of the connecting mechanism is provided with a tensioning mechanism, the tensioning mechanism comprises a plurality of supporting seats, a plurality of tensioning wheels and a plurality of first steel cables, the plurality of supporting seats are fixedly installed on the bottoms of the four fixing seats respectively, the plurality of tensioning wheels are rotatably connected to the inner side walls of the plurality of supporting seats respectively, and the plurality of first steel cables are wound on the outer surfaces of the plurality of tensioning wheels respectively.

[0018] Optionally, the outer surfaces of the guide wheels are wound with a plurality of second steel cables, the outer surfaces of the plurality of second steel cables are slidably connected with the inner side walls of the plurality of guide holes respectively, and the outer surfaces of the second steel cables, which are located between the two fixing seats, are wound with the outer surfaces of the four guide wheels.

[0019] (Three) beneficial effects

[0020] The utility model provides a gantry lifting appliance balance arm anti -toppling device has the following beneficial effects:

[0021] This gantry lifting appliance balance arm anti -toppling device, through the cooperation of guide wheel and positioning shaft setting, can in need to replace the steel cable in the process of lifting appliance, with the fixed clamp to the positioning shaft fixed, to drive the guide wheel to fix, to avoid the steel cable to appear the surface of guide wheel and slide, reach the effect of fixing one end of suspension mechanism, and the cooperation of support frame and guide wheel can guide the first steel cable, also can be tight fixed to the side of the second steel cable in U shape, again with support frame and suspension mechanism form 90 DEG relative angle, and the tensioning mechanism can be tight between support frame and suspension mechanism, make suspension mechanism and support frame form triangular stable support structure, the second steel cable of one side also stop movement, even when the second steel cable of the other side is dismantled and replaced, can also avoid the suspension mechanism to appear the deflection of large amplitude, so that the staff is more convenient operation, improve the security of the device. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is whole installation structure schematic diagram of the utility model;

[0023] Figure 2 It is suspension mechanism structure schematic diagram of the utility model;

[0024] Figure 3 It is guide mechanism explosion structure schematic diagram of the utility model;

[0025] Figure 4 It is mounting plate structure schematic diagram of the utility model;

[0026] Figure 5 It is connection mechanism explosion structure schematic diagram of the utility model;

[0027] Figure 6 It is tensioning mechanism installation structure schematic diagram of the utility model;

[0028] Figure 7 It is tensioning mechanism structure schematic diagram of the utility model.

[0029] In the drawing: 1, suspension mechanism;101, crossbeam;102, adjusting seat;103, lifting hook;2, guide mechanism;201, positioning frame;202, guide wheel;203, positioning shaft;204, guide plate;205, guide slot;206, fixed clamp;207, fixed rod;208, fixed hole;3, connection mechanism;301, mounting plate;302, fixed seat;303, support frame;304, connecting bolt;305, guide wheel;306, guide hole;4, tensioning mechanism;401, support seat;402, tensioning wheel;403, first steel cable;5, second steel cable. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] Please refer to Figures 1 to 7 The utility model embodiment provides a kind of anti-toppling device, which is applied to the scene that gantry sling appears inclination in the process of replacing one side cable, the structure of anti-toppling device is improved in this embodiment, it has the advantages of stable support and sufficient limiting. Specifically, with the example of replacing one side cable of gantry sling, as a preferred scheme in this embodiment, anti-toppling device is specifically gantry sling balance arm anti-toppling device, can still make gantry sling keep balance and stable in the process of replacing one side cable of gantry sling.

[0032] Please refer to Figures 1 to 7 The utility model provides a kind of technical scheme: gantry sling balance arm anti-toppling device, which is applied to the scene that gantry sling appears inclination in the process of replacing one side cable.

[0033] It comprises suspension mechanism 1, two guide mechanisms 2, connecting mechanism 3 and tensioning mechanism 4, wherein:

[0034] Two guide mechanisms 2 are respectively arranged on the two sides of suspension mechanism 1;

[0035] Guide mechanism 2 includes positioning frame 201, guide wheel 202, two positioning shafts 203 and two fixed clamps 206, guide wheel 202 is rotatably connected to the inner side wall of positioning frame 201, two positioning shafts 203 are respectively fixedly installed on the two sides of guide wheel 202, and are rotatably connected to the outer wall of positioning frame 201, two fixed clamps 206 are respectively slidably connected to the two sides of positioning frame 201, and the inner side wall of fixed clamp 206 is matched with the outer wall of positioning shaft 203;

[0036] Connecting mechanism 3 includes four fixed seats 302, four support frames 303 and four guide wheels 305, four fixed seats 302 are respectively arranged above two positioning frames 201, four support frames 303 are respectively arranged on the two sides of four fixed seats 302, and four guide wheels 305 are respectively rotatably connected to the inner side wall of four support frames 303;

[0037] Tensioning mechanism 4 is arranged on the inner side wall of connecting mechanism 3.

[0038] In this embodiment, the positioning frame 201 serves as the support frame of the guide mechanism 2, fixing the guide wheels 202, positioning shafts 203 and other components, providing the installation and fixation basis for the entire guide mechanism 2, ensuring the relative position stability between components, the guide wheels 202 are rotatably connected to the inner side wall of the positioning frame 201, which can guide the movement of the steel cable, making the steel cable run along the predetermined path during hoisting, reducing the wear and friction of the steel cable, and at the same time, when replacing the steel cable, the fixed guide wheels 202 can prevent the steel cable from sliding, and play a fixing role at one end of the suspension mechanism 1, the positioning shafts 203 are fixedly installed on both sides of the guide wheels 202 and are rotatably connected to the outer wall of the positioning frame 201, which are used to support and fix the guide wheels 202, so that they can stably rotate, and cooperate with the fixing clamps 206, when the fixing clamps 206 fix the positioning shafts 203, they can drive the guide wheels 202 to be fixed, thereby realizing the fixation of the steel cable, the fixing clamps 206 are slidably connected to both sides of the positioning frame 201, the inner side wall is matched with the outer wall of the positioning shaft 203, and the fixing clamps 206 are tightly matched with the positioning shaft 203 by sliding, thereby fixing the positioning shaft 203, and then fixing the guide wheels 202, preventing the steel cable from sliding on the surface of the guide wheels 202, achieving the effect of fixing one end of the suspension mechanism 1, the fixing seat 302 is arranged above the two positioning frames 201, which plays a role in connecting and fixing the support frame 303 and the guide wheel 305, and provides an installation position for the support seat 401 of the tensioning mechanism 4, and is an important part of the connecting mechanism 3, which ensures the connection and stability between components, the support frame 303 is arranged on both sides of the fixing seat 302, cooperates with the guide wheel 305, guides the second steel cable 5, and at the same time can tension and fix one side of the U-shaped second steel cable 5, and forms a 90° relative angle with the suspension mechanism 1, participating in forming a stable support structure of triangle, enhancing the stability of the device, the guide wheel 305 is rotatably connected to the inner side wall of the support frame 303, guiding the second steel cable 5, making the second steel cable 5 run along the predetermined path, reducing the wear and friction of the steel cable, and at the same time playing an auxiliary role when tensioning the second steel cable 5, ensuring that the second steel cable 5 can effectively tension and fix the suspension mechanism 1.

[0039] In the above embodiment, as a preferred solution, the suspension mechanism 1 comprises a crossbeam 101, two adjusting seats 102 and two hooks 103, the two adjusting seats 102 are respectively rotatably connected to the two sides of the bottom of the crossbeam 101, and the bottoms of the two adjusting seats 102 are respectively rotatably connected to the tops of the two hooks 103. The crossbeam 101 serves as the main frame of the suspension mechanism 1, and functions to connect and support the adjusting seats 102 and the hooks 103. It is the basic structure for carrying goods and connecting other components, provides lateral support for the entire suspension system, and the adjusting seats 102 are rotatably connected to the two sides of the bottom of the crossbeam 101, which can adjust the angle and position of the hooks 103, so that the hooks 103 can be flexibly adapted to different needs when hoisting goods, thereby increasing the flexibility and adaptability of the lifting device, facilitating precise hoisting of goods, and the hooks 103 are used for suspending and lifting goods, and are the components that directly contact the goods, realizing the functions of grabbing and lifting the goods, and being the key executive components for completing the hoisting task.

[0040] In the above embodiment, as a preferred solution, the guide mechanism 2 further comprises two guide plates 204 and two guide grooves 205, the two guide plates 204 are respectively fixedly installed on the outer surfaces of the two sides of the positioning frame 201, and the two guide grooves 205 are respectively formed on the outer surfaces of the two guide plates 204. The inner side walls of the two guide grooves 205 are respectively slidably connected to the outer surfaces of the two fixing clamps 206. The guide plates 204 are fixedly installed on the outer surfaces of the two sides of the positioning frame 201, and the guide grooves 205 are formed thereon to provide sliding tracks for the fixing clamps 206, so that the fixing clamps 206 can slide in the direction of the guide plates 204, facilitating the fixing and loosening operations of the positioning shaft 203. The guide grooves 205 are formed on the outer surfaces of the guide plates 204 and are slidably connected to the outer surfaces of the fixing clamps 206, limiting the sliding direction of the fixing clamps 206, ensuring that the fixing clamps 206 can accurately cooperate with the positioning shaft 203, and realizing the fixation of the positioning shaft 203.

[0041] In the above embodiment, as a preferred scheme, the guide mechanism 2 further comprises two fixed rods 207 and two fixed holes 208, the two fixed rods 207 are respectively threaded through the outer walls of the two fixed clamps 206, the two fixed holes 208 are respectively formed in the outer surface of the positioning frame 201 and located on one side of the positioning shaft 203, the end of the fixed rod 207 threaded through the fixed clamp 206 is inserted into the inner side wall of the fixed hole 208, the fixed rod 207 is threaded through the outer wall of the fixed clamp 206, when the fixed clamp 206 cooperates with the positioning shaft 203, by tightening the fixed rod 207, the end of the fixed rod 207 threaded through the fixed clamp 206 is inserted into the fixed hole 208 on the positioning frame 201, further fixing the fixed clamp 206, ensuring that the fixed clamp 206 will not loosen during hoisting, enhancing the fixing effect of the positioning shaft 203 and the guide wheel 202, the fixed hole 208 is formed in the outer surface of the positioning frame 201 and located on one side of the positioning shaft 203, cooperating with the fixed rod 207 to provide a position for the fixed rod 207 to insert, further fixing the fixed clamp 206 by inserting the fixed rod 207 into the fixed hole 208, ensuring the stability of the guide mechanism 2.

[0042] In the above embodiment, as a preferred scheme, the connecting mechanism 3 further comprises a mounting plate 301 and a plurality of guide holes 306, the mounting plate 301 is fixedly installed on the middle part of the top of the cross beam 101, and the plurality of guide holes 306 are respectively formed in the outer surfaces of the four fixed seats 302, the mounting plate 301 is fixedly installed on the middle part of the top of the cross beam 101, used for connecting and fixing other components such as the fixed seat 302, so as to firmly connect the connecting mechanism 3 with the suspension mechanism 1, ensuring the structural stability of the whole device, the guide hole 306 is formed in the outer surface of the fixed seat 302, cooperating with the second steel cable 5, so that the second steel cable 5 can pass through the guide hole 306, guiding the direction of the second steel cable 5, ensuring that the second steel cable 5 runs along the predetermined path during hoisting, reducing the wear and friction of the steel cable.

[0043] In the above embodiment, as a preferred scheme, the connecting mechanism 3 further comprises a plurality of connecting bolts 304, the plurality of connecting bolts 304 are threaded through the outer walls of a part of the support frames 303, and the ends of the plurality of connecting bolts 304 threaded through the outer walls of a part of the support frames 303 are threadedly connected with the outer walls of another part of the support frames 303, the connecting bolt 304 is threaded through the outer wall of a part of the support frame 303 and threadedly connected with the outer wall of another part of the support frame 303 after being threaded out, used for connecting and fixing different support frames 303, so as to form an integral structure between the support frames 303, ensuring the strength and stability of the connecting mechanism 3.

[0044] In the above embodiment, as a preferred solution, the tensioning mechanism 4 comprises a plurality of support seats 401, a plurality of tensioning wheels 402 and a plurality of first steel cables 403, the plurality of support seats 401 are respectively fixedly installed at the bottom of the four fixed seats 302, the plurality of tensioning wheels 402 are respectively rotatably connected to the inner side wall of the plurality of support seats 401, and the plurality of first steel cables 403 are respectively wound on the outer surface of the plurality of tensioning wheels 402. The support seat 401 is fixedly installed at the bottom of the four fixed seats 302 and used for supporting and fixing the tensioning wheel 402, thereby providing a mounting and fixing basis for the tensioning wheel 402 and ensuring that the tensioning wheel 402 can stably work. The tensioning wheel 402 is rotatably connected to the inner side wall of the support seat 401 and used for winding the first steel cable 403. By adjusting the winding mode and tensioning degree of the first steel cable 403 on the tensioning wheel 402, the first steel cable 403 can be tensioned, so that the tensioning between the support frame 303 and the suspension mechanism 1 is realized, and a triangular stable support structure is formed between the suspension mechanism 1 and the support frame 303. The first steel cable 403 is wound on the outer surface of the tensioning wheel 402 and connects the support frame 303 and the suspension mechanism 1. By tensioning the first steel cable 403, the triangular stable support structure is formed between the suspension mechanism 1 and the support frame 303. Even when the first steel cable 403 on one side is replaced, the suspension mechanism 1 can also avoid large deflection, thereby ensuring the stability and safety of the device.

[0045] In the above embodiment, as a preferred solution, the outer surface of the guide wheel 202 is wound with a plurality of second steel cables 5, the outer surfaces of the plurality of second steel cables 5 are respectively slidably connected with the inner side walls of the plurality of guide holes 306, and the outer surface of the second steel cable 5 located between the two fixed seats 302 is wound with the outer surfaces of the four guide wheels 305. By winding the second steel cable 5 on the outer surface of the guide wheel 202, passing through the guide hole 306 on the fixed seat 302 and winding with the outer surface of the guide wheel 305, the second steel cable 5 is used for connecting the suspension mechanism 1 and other components, achieving traction and fixation of the suspension mechanism 1, and simultaneously transmitting tension during hoisting to complete the hoisting task of the goods.

[0046] In the utility model, the working steps of the device are as follows:

[0047] 1, fixed guide wheel 202: through the fixed clamp 206 in the sliding guide mechanism 2, make it with the positioning shaft 203 close cooperation, then tighten the fixed rod 207, insert the fixed rod 207 into the fixed hole 208 on the positioning frame 201, thereby fixed positioning shaft 203, drive guide wheel 202 fixed, prevent steel cable from sliding on the surface of guide wheel 202, realize the fixation of one end of suspension mechanism 1.

[0048] 2, through the tensioning of the first steel cable 403, a triangular stable support structure is formed with the suspension mechanism 1 and the support frame 303, and the stability of the suspension mechanism 1 is enhanced.

[0049] 3、Replace the steel cable, under the double protection of the guide wheel 202 and the triangular stable support structure, the staff can safely disassemble and replace the second steel cable 5 on one side, because the second steel cable 5 on the other side is fixed, and the suspension mechanism 1 has good stability, which can avoid large deflection of the suspension mechanism 1 and reduce the operation risk.

[0050] 4、After the steel cable is replaced, the fixing rod 207 is loosened, the fixing clamp 206 is slid along the guide groove 205, the fixing of the positioning shaft 203 is released, the guide wheel 202 returns to the rotatable state, the tension degree of the first steel cable 403 is adjusted according to the actual hoisting demand, the device returns to the normal hoisting working state, and the material carrying operation is continued.

[0051] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A gantry spreader balance arm anti-toppling device, characterized in that, Including suspension mechanism (1), two guide mechanism (2), connecting mechanism (3) and tensioning mechanism (4), wherein: Two guide mechanism (2) are respectively arranged on the two sides of suspension mechanism (1); The guide mechanism (2) includes positioning frame (201), guide wheel (202), two positioning shafts (203) and two fixed clamps (206), the guide wheel (202) is rotatably connected to the inner side wall of positioning frame (201), two positioning shafts (203) are respectively fixedly installed on the two sides of guide wheel (202), and are rotatably connected to the outer wall of positioning frame (201), two fixed clamps (206) are respectively slidably connected to the two sides of positioning frame (201), the inner side wall of fixed clamp (206) is matched with the outer wall of positioning shaft (203); The connecting mechanism (3) includes four fixed seats (302), four support frames (303) and four guide wheels (305), four fixed seats (302) are respectively arranged above two positioning frames (201), four support frames (303) are respectively arranged on the two sides of four fixed seats (302), and four guide wheels (305) are rotatably connected to the inner side wall of four support frames (303). The tensioning mechanism (4) is arranged on the inner side wall of connecting mechanism (3).

2. The gantry spreader counterweight anti-tip device of claim 1, wherein: The suspension mechanism (1) includes crossbeam (101), two adjusting seats (102) and two hooks (103), two adjusting seats (102) are rotatably connected to the two sides of the bottom of crossbeam (101), and the bottom of two adjusting seats (102) is rotatably connected with the top of two hooks (103).

3. The gantry spreader counterweight anti-tip device of claim 1, wherein: The guide mechanism (2) further includes two guide plates (204) and two guide grooves (205), two guide plates (204) are fixedly installed on the two sides of the outer surface of positioning frame (201), two guide grooves (205) are respectively formed on the outer surface of two guide plates (204), and the inner side wall of two guide grooves (205) is slidably connected with the outer surface of two fixed clamps (206).

4. The gantry spreader counterweight anti-tip device of claim 3, wherein: The guide mechanism (2) further includes two fixed rods (207) and two fixed holes (208), two fixed rods (207) are respectively threaded through the outer wall of two fixed clamps (206), two fixed holes (208) are respectively formed on the outer surface of positioning frame (201) and located on one side of positioning shaft (203), and one end of fixed rod (207) penetrating out of fixed clamp (206) is inserted into the inner side wall of fixed hole (208).

5. The gantry spreader counterweight anti-tip device of claim 2, wherein: The connecting mechanism (3) further includes mounting plate (301) and a plurality of guide holes (306), the mounting plate (301) is fixedly installed on the middle of the top of crossbeam (101), and a plurality of guide holes (306) are respectively formed on the outer surface of four fixed seats (302).

6. The gantry spreader counterweight anti-tip device of claim 5, wherein: The connecting mechanism (3) further comprises a plurality of connecting bolts (304), the plurality of connecting bolts (304) are threaded through the outer wall of one of the support frames (303), and one end of the plurality of connecting bolts (304) penetrating through one of the support frames (303) is threadedly connected with the outer wall of the other support frame (303).

7. The gantry spreader counter tipping device of claim 1, wherein: The tensioning mechanism (4) comprises a plurality of support seats (401), a plurality of tensioning wheels (402) and a plurality of first steel cables (403), the plurality of support seats (401) are respectively fixedly installed at the bottom of the four fixing seats (302), the plurality of tensioning wheels (402) are respectively rotatably connected to the inner side walls of the plurality of support seats (401), and the plurality of first steel cables (403) are respectively wound on the outer surfaces of the plurality of tensioning wheels (402).

8. The gantry spreader counterweight anti-tip device of claim 5, wherein: The outer surface of the guide wheel (202) is wound with a plurality of second steel cables (5), the outer surfaces of the plurality of second steel cables (5) are respectively slidably connected with the inner side walls of the plurality of guide holes (306), and the outer surface of the second steel cable (5) between the two fixing seats (302) is wound with the outer surfaces of the four guide wheels (305).

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