CN114394160B - Steel member tilting prevention device for semi-trailer - Google Patents

Abstract

The utility model provides a steel member anti-falling device for semi-trailer can effectively protect the steel member of placing on the automobile body, guarantees that the steel member can not scatter from the automobile body, and fastening mechanism then can be automatic take-up fixed rope, effectively reduces workman's work load to the efficiency of steel member in the loading in-process has also been improved.

Description

Steel member tilting prevention device for semi-trailer

Technical Field

The invention relates to the technical field of steel member transportation, in particular to a steel member fall preventing device for a semi-trailer.

Background

As is known, steel components are generally divided into long and large pieces, and both have the characteristics of large volume and heavy weight, so that the steel components need to be manufactured in a factory workshop and then transported to a corresponding construction site for assembly, however, the steel components have to rely on large transportation equipment in the transportation process, wherein the semi-trailer traction vehicle is a common transportation equipment because of higher economic advantage;

the trailer of the semi-trailer traction vehicle consists of a vehicle plate, a chassis and wheels, wherein the traditional vehicle plate does not contain a protective device, when long-strip-shaped members are transported in a pile, a plurality of steel members are firstly bundled and then stacked on the trailer, then a plurality of fixing ropes are arranged on the trailer, the positions of the steel members are fixed through the fixing ropes, and for large-sized members with the volume exceeding the width of the trailer, a plurality of bottom rods are required to be firstly padded on the surface of the trailer, and then the large-sized members are placed on the bottom rods;

however, since the process of installing the fixing rope for fixing the long condition of the pile is excessively complicated, the loading time of the long condition is long, and thus the overall transportation efficiency of the long condition is affected, and the binding of the fixing rope is manually completed by a worker, so that the workload of the worker is increased, and the labor intensity of the worker is high; when large-scale parts are transported, the bottom rod is generally wooden, so that the bottom rod has lower structural strength and is easy to break due to the fact that the weight of the steel member is too large, and the steel member falls off from the trailer to cause transportation accidents;

therefore, in view of the above, there is a need in the market for an anti-fall device that can ensure safe transportation of steel members.

Disclosure of Invention

In order to overcome the defects in the background art, the invention discloses a steel member anti-falling device for a semi-trailer.

In order to achieve the aim of the invention, the invention adopts the following technical scheme:

the steel member anti-falling device for the semi-trailer comprises a protection mechanism for guaranteeing the safety of a steel member on a vehicle body and a fastening mechanism capable of automatically tightening a fixing rope wound on the steel member;

the protection mechanisms are symmetrically arranged in two groups, and the two groups of protection mechanisms are respectively positioned on two side surfaces of the vehicle body; the protection mechanism consists of a plurality of anti-falling piles, and the anti-falling piles in the two groups of protection mechanisms are uniformly and correspondingly arranged.

Preferably, the anti-falling pile is of a folding structure and comprises a base, a pile body and a butt joint mechanism, wherein the base is of a right angle shape, the vertical side of the base is fixedly connected with the side surface of the trailer correspondingly, the horizontal side of the base and the surface of the trailer are positioned on the same plane, and two symmetrical mounting plates are vertically arranged on the top surface of the horizontal side of the base; a pile body is hinged between the two mounting plates, wherein the rotation range of the pile body is 0-90 degrees; and when the two opposite pile bodies are in a horizontal state, the two opposite pile bodies can be connected through the butt joint mechanism.

Preferably, the butt joint mechanism comprises a male head, a female head and a positioning piece, the male head and the female head can be correspondingly inserted, the male head and the female head are respectively arranged on the top surfaces of two opposite pile bodies, and the positioning piece is used for fixing the positions of the male head and the female head.

Preferably, the male head is provided with a convex block, the female head is provided with a concave block, the positioning piece comprises a rod sleeve and an L-shaped clamping rod, the rod sleeve is arranged on the side face of the female head, the straight rod end of the clamping rod is correspondingly inserted with the rod sleeve, the end of the straight rod end is provided with a limiting block, the bending end of the clamping rod is located at the female head, and the top face of the female head is provided with a placing groove corresponding to the bending end of the clamping rod.

Preferably, the tail end of the pile body is provided with an extension plate, and the extension plate and the two mounting plates are respectively provided with a through hole which can be correspondingly communicated.

Preferably, the anti-falling pile is in a plug-in structure and comprises a sleeve, a pile insert and a compression bar, wherein the sleeve is fixedly arranged on the side surface of the vehicle body, the pile insert is correspondingly plugged with the sleeve, and the pile insert is correspondingly in a vertical state; the bottom pile body of pile is equipped with the fixture of ox horn form, and the concave surface of fixture and sheathed tube top face are corresponding to be contradicted, the top of pile is articulated through articulated post and depression bar correspondence, and is equipped with the spring between pile and the depression bar.

Preferably, the side face of the rod body of the compression rod is provided with an insertion pipe, an insertion rod is inserted in the insertion pipe, the head end of the insertion rod is provided with a limiting piece, the tail end of the insertion rod faces towards the insertion pile correspondingly, and the side face of the rod body of the insertion pile is provided with a socket which is matched with the insertion rod correspondingly.

Preferably, the top surface of the socket is a convex arc surface, the tail end of the top surface is provided with a jack matched with the inserted link, the head end of the top surface is the low end of the arc surface, and the head end of the top surface of the socket faces towards the vehicle body correspondingly.

Preferably, two opposite anti-falling piles are arranged as a pair, a fastening mechanism is arranged between every two adjacent pairs of anti-falling piles, the fastening mechanism comprises a rope collecting box and a fixing ring, the rope collecting box is arranged on one side bottom surface of the car body, the fixing ring is arranged on the other side bottom surface of the car body, a fixing rope is wound in the rope collecting box, the head end of the fixing rope extends out of the rope collecting box, and the head end of the fixing rope is correspondingly connected with the fixing ring after bypassing the steel member.

Preferably, the rope collecting box comprises a box body, a rope winding ratchet wheel, a rotation stopping pawl, a baffle plate, a motor and a stop block; the rope winding ratchet wheel is positioned in the box body, the center of the outer edge surface of the rope winding ratchet wheel is provided with a ring groove for winding and fixing the rope, and the edge of the outer edge surface is provided with a ratchet; the rotation stopping end of the rotation stopping pawl is correspondingly abutted against the ratchet teeth of the rope winding ratchet wheel, and the installation end of the rotation stopping pawl is provided with a rotating shaft; the outer surface of box body is equipped with the export that is used for fixed rope head end to pass through for drive rope winding ratchet pivoted motor, and be used for the rectangular hole that the pivot passed through, and the pivot is located the bottom in rectangular hole, and the other spaces in rectangular hole are filled up by the dog, and the internal surface of box body is equipped with and is used for stopping rotating pawl to rope winding ratchet pivoted baffle.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the steel member anti-falling device for the semi-trailer disclosed by the invention can effectively protect the steel member placed on the vehicle body, ensure that the steel member cannot scatter from the vehicle body, and ensure that the fastening mechanism can automatically take up and fix the rope so as to effectively reduce the workload of workers and improve the efficiency of the steel member in the loading process;

in addition, folding type anti-falling pile can realize protecting different types of steel members only by rotating the pile body, and the anti-falling pile does not need to be disassembled when protecting different types of steel members, so that the operation mode is simpler, and the plug-in type anti-falling pile provides pressure for piled long-strip-shaped members through the compression bar, so that the stability of piling long conditions when placed on a vehicle body is improved.

Drawings

FIG. 1 is a schematic diagram of a structure of the present invention;

FIG. 2 is a schematic structural view of a plug-in type anti-fall pile;

FIG. 3 is a schematic structural view of a compression bar;

fig. 4 is a schematic structural view of the rope winding box;

fig. 5 is a schematic view of the structure of the rope winding ratchet.

In the figure: 1. anti-falling piles; 101. a base; 102. a pile body; 103. a male; 104. a female head; 105. a positioning piece; 1051. a rod sleeve; 1052. a clamping rod; 106. an extension plate; 107. a sleeve; 108. inserting piles; 109. a clamp; 110. a compression bar; 111. a spring; 112. a cannula; 113. a rod; 114. a limiting block; 115. a socket; 116. a jack; 2. a fastening mechanism; 201. a rope collecting box; 2011. a case body; 2012. rope winding ratchet wheel; 2013. a rotation stopping pawl; 2014. a rotating shaft; 2015. an outlet; 2016. a motor; 2017. a slit hole; 2018. a stop block; 2019. a baffle; 202. a fixing ring; 3. and a vehicle body.

Detailed Description

In the description, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc., the drawings merely correspond to the drawings of the present invention, and in order to facilitate description of the present invention, it is not indicated or implied that the device or element referred to must have a specific azimuth:

the steel member fall preventing device for the semi-trailer comprises a protecting mechanism for guaranteeing the safety of the steel member on the vehicle body 3 and a fastening mechanism 2 capable of automatically tightening and winding a fixing rope on the steel member, wherein the steel member fall preventing device is described with reference to figures 1-3;

the protection mechanisms are symmetrically arranged in two groups, and the two groups of protection mechanisms are respectively positioned on two side surfaces of the vehicle body 3; the protection mechanism consists of a plurality of anti-falling piles 1, and the anti-falling piles 1 in the two groups of protection mechanisms are uniformly and correspondingly arranged;

one example of the fall preventing pile 1 is: the anti-falling pile 1 is of a folding structure, so that the anti-falling pile 1 has two working states, wherein when the pile body 102 is in a horizontal state, namely, the pile body 102 is positioned on the surface of the vehicle body 3, the pile body 102 can serve as a bottom rod to assist the vehicle body 3 in transporting large steel members, and stability and safety in the transportation process of the large steel members are improved; when the pile body 102 is in a vertical state, namely the pile body 102 is correspondingly vertical to the surface of the vehicle body 3, the pile body 102 can serve as a railing for assisting the vehicle body 3 to transport piled long strip-shaped steel members, so that the piled steel members are prevented from scattering, and the safe transportation of the steel members is ensured; the anti-fall pile 1 comprises a base 101, a pile body 102 and a butt joint mechanism, wherein the base 101 is in a right angle shape, the vertical side of the base 101 is correspondingly and fixedly connected with the side surface of the vehicle body 3, the horizontal side of the base 101 and the surface of the vehicle body 3 are positioned on the same plane, and the surface of the vehicle body 3 is correspondingly and longitudinally extended to a certain extent through the base 101, so that two states of the pile body 102 cannot influence steel members to be placed on the surface of the vehicle body 3; two symmetrical mounting plates are vertically arranged on the top surface of the horizontal side of the base 101; a pile body 102 is hinged between the two mounting plates, wherein the rotation range of the pile body 102 is 0-90 degrees, the pile body 102 is in a horizontal working state when rotating for 0 degrees, and the pile body 102 is in a vertical working state when rotating for 90 degrees; when the two opposite pile bodies 102 are in a horizontal state, the two pile bodies can be connected through the butt joint mechanism, namely, the pair of pile bodies 102 can be connected into one pile body in the horizontal state, so that the effect of supporting a large-sized piece is improved;

in addition, the docking mechanism comprises a male head 103, a female head 104 and a positioning piece 105, the male head 103 and the female head 104 can be correspondingly spliced, the male head 103 and the female head 104 are respectively arranged on the top surfaces of two opposite pile bodies 102, the positioning piece 105 is used for fixing the positions of the male head 103 and the female head 104, when the pile bodies 102 are in a horizontal state, the male head 103 and the female head 104 on the opposite pile bodies 102 are spliced, and then the positions of the male head 103 and the female head 104 are fixed through the positioning piece 105, so that the docking mechanism can realize the connection of the opposite pile bodies 102; according to the requirement, the male head 103 is set as a convex block, the female head 104 is set as a concave block, and two opposite pile bodies 102 can not interfere with each other in the rotation process through the convex block and the concave block; the positioning piece 105 comprises a rod sleeve 1051 and an L-shaped clamping rod 1052, the rod sleeve 1051 is arranged on the side surface of the female head 104, the straight rod end of the clamping rod 1052 is correspondingly spliced with the rod sleeve 1051, a limiting piece is arranged at the end of the straight rod end, the bending end of the clamping rod 1052 is positioned at the female head 104, a placing groove which is correspondingly matched with the bending end of the clamping rod 1052 is arranged on the top surface of the female head 104, when two opposite pile bodies 102 are in a horizontal state, and when the male head 103 and the female head 104 are spliced, the bending end of the clamping rod 1052 enters the placing groove through rotating the clamping rod 1052, namely the connection of the male head 103 and the female head 104 is completed, and then the anti-falling pile 1 can be used for supporting a large steel member to be transported; particularly, the tail end of the pile body 102 is provided with an extension plate 106, and the extension plate 106 and the two mounting plates are respectively provided with a through hole which can be correspondingly communicated, when the pile body 102 is in a vertical state, the extension plate 106 can be abutted against the tail end of the horizontal side of the base 101, so that a limiting effect is achieved, the pile body 102 is prevented from continuing to rotate, meanwhile, the extension plate 106 and the through holes on the two mounting plates are correspondingly in a communicated state, and at the moment, after the positioning pins are inserted into the communicated through holes, the position of the pile body 102 can be fixed, so that the anti-falling pile 1 is kept in the vertical state;

another embodiment of the fall arrest pile 1 is: the anti-falling pile 1 is in a plug-in structure, namely, the anti-falling pile 1 plays a role of a railing, and can effectively prevent long conditions from rolling off from two sides of the vehicle body 3; the anti-fall pile 1 comprises a sleeve 107, a pile 108 and a compression bar 110, wherein the sleeve 107 is fixedly arranged on the side surface of the car body 3, the pile 108 is correspondingly inserted with the sleeve 107, the pile 108 is correspondingly in a vertical state, namely, the pile 108 is correspondingly vertical to the top surface of the car body 3, and the head end of the pile 108 is higher than the top surface of the car body 3, so that the purpose of blocking long conditions is achieved; the bottom pile body of the pile 108 is provided with a clamp 109 in a ox horn shape, the concave surface of the clamp 109 is correspondingly abutted against the top surface of the sleeve 107, the clamp 109 can play a limiting role to prevent the pile 108 from falling from the sleeve 107, the top of the pile 108 is correspondingly hinged with the compression bar 110 through a hinge post, a spring 111 is arranged between the pile 108 and the compression bar 110, and the compression bar 110 can be automatically pulled to rotate towards the top surface direction of the car body 3 by utilizing the spring 111, so that the compression bar 110 presses stacked cylindrical steel members, and the fixing effect on the cylindrical steel members is realized; in particular, the end surface of the compression bar 110 facing the vehicle body 3 is in a zigzag shape, so that the friction force between the compression bar 110 and the cylindrical steel member can be enhanced, the stacking position of the cylindrical steel member is further ensured to be unchanged under the pressure of the compression bar 110, and the stability of the cylindrical steel member in the transportation process is improved; preferably, the spring 111 is inclined, and an included angle between the spring 111 and the compression bar 110 is 5-10 °, through the inclined angle, the spring 111 can better pull the compression bar 110 to rotate, and the compression bar 110 has smaller force in the process of recovering to the state coaxial with the pile 108, so that the operation of workers is facilitated; in addition, a limiting plate is arranged on the hinged end face of the compression bar 110, and when the compression bar 110 and the pile 108 are in a coaxial state, the limiting plate is abutted against the top end face of the pile 108;

in addition, the side surface of the rod body of the compression rod 110 is provided with an insertion pipe 112, an insertion rod 113 is inserted into the insertion pipe 112, the head end of the insertion rod 113 is provided with a limiting block 114, the tail end of the insertion rod 113 correspondingly faces the insertion pile 108, the side surface of the rod body of the insertion pile 108 is provided with a socket 115 correspondingly matched with the insertion rod 113, when the cylindrical steel member is not required to be pressed, the compression rod 110 and the insertion pile 108 are kept coaxial, and at the moment, the insertion rod 113 and the socket 115 are correspondingly matched and inserted, so that the position of the compression rod 110 can be kept coaxial; when the cylindrical steel member needs to be pressed, the insert rod 113 is pulled out from the socket 115, and the pressing rod 110 rotates towards the top surface of the vehicle body 3 under the action of the spring 111 until the pressing rod 110 abuts against the cylindrical steel member, so that the purpose of pressing the cylindrical steel member is achieved; according to the need, the top surface of the socket 115 is set to be a convex arc surface, the tail end of the top surface is provided with a jack 116 matched with the inserted link 113, the head end of the top surface is the lower end of the arc surface, and the head end of the top surface of the socket 115 faces the direction of the vehicle body 3, by setting the top surface of the socket 115 to be a convex arc surface, when the pressure lever 110 rotates, the tail end of the pressure lever 110 can move along the radian of the convex arc surface, and when the pressure lever 110 is in a coaxial state with the inserted link 108, the inserted link 113 can reach the jack 116 of the socket 115 and then automatically fall into the jack 116, namely, in the rotating process of the pressure lever 110, a worker only needs to operate the action of pulling out the inserted link 113, so that the operating difficulty of the worker is greatly reduced; in particular, the rod sleeve 1051, the insert rod 113 and the socket 115 can be correspondingly provided as two sets, and the two sets of structures are respectively positioned on two side surfaces of the compression rod 110 and the insert 108; in addition, when the plug-in type anti-falling pile 1 is adopted and a large piece is required to be placed on the vehicle body 3, the pile 108 is pulled out from the sleeve 107, and then the pile 108 is placed on the surface of the vehicle body 3, so that the pile 108 can be used as a bottom rod to support the large piece;

in addition, two opposite anti-falling piles 1 are arranged as a pair, a fastening mechanism 2 is arranged between two adjacent pairs of anti-falling piles 1, the fastening mechanism 2 comprises a rope collecting box 201 and a fixing ring 202, the rope collecting box 201 is arranged on the bottom surface of one side of the car body 3, the fixing ring 202 is arranged on the bottom surface of the other side of the car body 3, a fixing rope is wound in the rope collecting box 201, the head end of the fixing rope extends out of the rope collecting box 201, the head end of the fixing rope is correspondingly connected with the fixing ring 202 after bypassing a steel member, when the rope collecting box 201 is in a paying-off state, a worker can pull the fixing rope out of the rope collecting box 201 through pulling the head end of the fixing rope, and then the fixing rope is used for binding the steel member, and after the fixing rope is bound with the fixing ring 202, the rope collecting box 201 is wound at the moment, so that the fixing rope is kept tight, and in addition, the head end of the fixing rope can be provided with connecting parts such as a hook and a buckle, and the connection with the fixing ring 202 is convenient; the rope winding box 201 comprises a box body 2011, a rope winding ratchet 2012, a rotation stopping pawl 2013, a baffle 2019, a motor 2016 and a stop 2018 according to requirements; the rope winding ratchet wheel 2012 is positioned in the box 2011, the center of the outer edge surface of the rope winding ratchet wheel 2012 is provided with a ring groove for winding the fixed rope, the edge of the outer edge surface is provided with a ratchet, and the paying-off and winding of the fixed rope are realized through the forward rotation and the reverse rotation of the rope winding ratchet wheel 2012; the rotation stopping end of the rotation stopping pawl 2013 is in corresponding contact with the ratchet teeth of the rope winding ratchet wheel 2012, the installation end of the rotation stopping pawl 2013 is provided with a rotating shaft 2014, the rope winding ratchet wheel 2012 can only rotate forward through the rotation stopping pawl 2013, so that the fixed rope can be paid off, and the fixed rope can not be wound in reverse; the outer surface of the box 2011 is provided with an outlet 2015 for passing through the head end of a fixed rope, a motor 2016 for driving the rope ratchet 2012 to rotate, and a strip hole 2017 for passing through the rotating shaft 2014, wherein the rotating shaft 2014 is positioned at the bottom end of the strip hole 2017, the rest space of the strip hole 2017 is filled with a stop block 2018, namely, when the rotating shaft 2014 is positioned at the bottom end of the strip hole 2017, the stop pawl 2013 and the rope ratchet 2012 are in an abutting state, and the position of the stop pawl 2013 is kept fixed due to the stop block 2018, at the moment, the rope ratchet 2012 can only perform forward rotation paying-off, when the rope ratchet 2012 needs to reversely rotate for taking-up, the stop block 2018 is taken out from the strip hole 2017, then the rotating shaft 2014 is moved to the head end of the strip hole 2017, and finally the stop block 2018 is plugged into the strip hole 2017, so that the stop pawl 2013 can be moved upwards, and the rope ratchet can reversely rotate under the stop pawl 2013, and the stop pawl 2012 is not blocked by the stop pawl 2013, and the stop pawl 2012 is prevented from rotating towards the ratchet 2012, and the stop pawl 2012 is further;

in addition, when the vehicle body 3 is used for transporting long conditions, the tail end of the vehicle body 3 is provided with a jacking platform, so that the tail end of the long conditions is jacked up, and long conditions longer than the vehicle body 3 can be prevented from sliding along the tail end of the vehicle body 3.

The invention has not been described in detail in the prior art, and it is apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (3)

1. A steel member fall-preventing device for a semi-trailer is characterized in that: comprises a protection mechanism for guaranteeing the safety of steel members on a vehicle body (3) and a fastening mechanism (2) capable of automatically tightening and winding a fixed rope on the steel members;

the protection mechanisms are symmetrically arranged in two groups, and the two groups of protection mechanisms are respectively positioned on two side surfaces of the vehicle body (3); the protection mechanism consists of a plurality of anti-falling piles (1), and the anti-falling piles (1) in the two groups of protection mechanisms are uniformly and correspondingly arranged;

the anti-falling pile (1) is of a plug-in type structure, the anti-falling pile (1) comprises a sleeve (107), a pile inserting (108) and a compression bar (110), the sleeve (107) is fixedly arranged on the side face of the vehicle body (3), the pile inserting (108) is correspondingly plugged with the sleeve (107), and the pile inserting (108) is correspondingly in a vertical state; the bottom pile body of the pile (108) is provided with a clamp (109) in a ox horn shape, the concave surface of the clamp (109) is correspondingly abutted against the top of the sleeve (107), the top of the pile (108) is correspondingly hinged with the compression bar (110) through a hinge post, and a spring (111) is arranged between the pile (108) and the compression bar (110);

the side face of the rod body of the compression rod (110) is provided with an insertion pipe (112), an insertion rod (113) is inserted into the insertion pipe (112), the head end of the insertion rod (113) is provided with a limiting block (114), the tail end of the insertion rod (113) faces towards the insertion pile (108) correspondingly, and the side face of the rod body of the insertion pile (108) is provided with a socket (115) which is matched with the insertion rod (113) correspondingly;

the top surface of the socket (115) is a convex arc surface, the tail end of the top surface is provided with a jack (116) matched with the inserted link (113), the head end of the top surface is the low end of the arc surface, and the head end of the top surface of the socket (115) faces the direction of the vehicle body (3) correspondingly.

2. The steel member fall prevention device for a semitrailer according to claim 1, characterized in that: two opposite anti-falling piles (1) are arranged into a pair, a fastening mechanism (2) is arranged between two adjacent pairs of anti-falling piles (1), the fastening mechanism (2) comprises a rope collecting box (201) and a fixing ring (202), the rope collecting box (201) is arranged on one side bottom surface of a vehicle body (3), the fixing ring (202) is arranged on the other side bottom surface of the vehicle body (3), a fixing rope is wound in the rope collecting box (201), the head end of the fixing rope extends out of the rope collecting box (201), and the head end of the fixing rope is correspondingly connected with the fixing ring (202) after bypassing a steel member.

3. The steel member fall prevention device for a semitrailer according to claim 2, characterized in that: the rope collecting box (201) comprises a box body (2011), a rope winding ratchet wheel (2012), a rotation stopping pawl (2013), a baffle plate (2019), a motor (2016) and a stop block (2018); the rope winding ratchet wheel (2012) is positioned in the box body (2011), a ring groove for winding and fixing the rope is arranged in the center of the outer edge surface of the rope winding ratchet wheel (2012), and a ratchet is arranged at the edge of the outer edge surface; the rotation stopping end of the rotation stopping pawl (2013) is correspondingly abutted against the ratchet teeth of the rope winding ratchet wheel (2012), and a rotating shaft (2014) is arranged at the mounting end of the rotation stopping pawl (2013); the outer surface of box body (2011) is equipped with export (2015) that are used for fixed rope head end to pass through for drive wiring ratchet (2012) pivoted motor (2016) and be used for rectangular hole (2017) that pivot (2014) passed through, and pivot (2014) are located the bottom of rectangular hole (2017), and the rest space of rectangular hole (2017) is filled with dog (2018), and the internal surface of box body (2011) is equipped with baffle (2019) that are used for blockking and stop changeing pawl (2013) to wiring ratchet (2012) direction pivoted.