CN218161467U - Slide rail device of universal circuit breaker - Google Patents

Abstract

The utility model provides an universal circuit breaker's slide rail device, quiet slide rail and rotation are installed move the slide rail on the quiet slide rail, quiet slide rail with move the slide rail on be equipped with respectively with circuit breaker body sliding fit's quiet slide rail face and move the slide rail face, it can drive to move the slide rail face and rotate to flushing with quiet slide rail face to move the slide rail, quiet slide rail with move and be equipped with the movement clearance between the slide rail, be equipped with the transition piece in the side of movement clearance, be equipped with on the transition piece with circuit breaker body sliding fit's transition face, accept transition circuit breaker body through the transition face, can prevent that circuit breaker body card from going into the movement clearance between slide rail and the quiet slide rail, transition piece direct mount moreover still has simple structure, part quantity few and characteristics with low costs.

Description

Slide rail device of universal circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus field, concretely relates to universal circuit breaker's slide rail device.

Background

The universal circuit breaker is usually used for controlling the on-off of a circuit, and when the drawer base of the withdrawable universal circuit breaker is connected with the body, the side plate slide rail is required to provide support guidance for the body, so that the body can be conveniently moved. However, the conventional side plate slide rail is usually slidably mounted on the side plate, and the following problems are often present:

1. the structure is complex;

2. the number of parts is large, the machining is complex, and the cost is high;

3. the installation is difficult, and the disassembly and the maintenance are inconvenient;

4. the occupied space is large.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a simple structure, part is small in quantity's universal circuit breaker's slide rail device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an omnipotent circuit breaker's slide rail device, quiet slide rail and rotation are installed move the slide rail on the quiet slide rail, quiet slide rail with move the slide rail on be equipped with respectively with circuit breaker body sliding fit's quiet slide rail face and move the slide rail face, it can drive to move the slide rail face and rotate to flush with quiet slide rail face to move the slide rail, quiet slide rail with move and be equipped with the movement clearance between the slide rail, be equipped with the transition piece in the side of movement clearance, be equipped with on the transition piece with circuit breaker body sliding fit's transition face.

Preferably, be equipped with support piece on the circuit breaker body, be equipped with the pivoted roller on support piece, support piece has the back shaft that is located roller axis one side, and the external diameter of back shaft is greater than the external diameter of roller, quiet slide rail face with move the slide rail face respectively with the roller cooperation, the transition face with support piece's back shaft cooperation, the height that highly is less than quiet slide rail face of transition face.

Preferably, the device further comprises a connecting piece which penetrates through the static slide rail, the transition piece and the movable slide rail respectively, the transition piece and the movable slide rail are arranged on the connecting piece in a rotating mode respectively, and a limiting structure used for blocking the transition piece from rotating is arranged on the static slide rail.

Preferably, the static sliding rail comprises at least two mounting plates located on different planes and a bending plate connected between the at least two mounting plates, the transition piece is mounted on one of the mounting plates, and the bending plate forms the limiting structure.

Preferably, the transition piece is parallel to one of the mounting plates, a limit groove is formed in the side edge, close to one side of the bending plate, of the transition piece, and the limit groove can be sleeved on the bending plate in a limiting fit mode.

Preferably, the connecting piece comprises a first limiting end, a second limiting end, a first connecting shaft and a second connecting shaft, wherein the first connecting shaft and the second connecting shaft are coaxially arranged between the first limiting end and the second limiting end, the first connecting shaft can respectively penetrate through the static sliding rail and the transition piece, the second connecting shaft can penetrate through the movable sliding rail, the radius of the second connecting shaft is larger than that of the first connecting shaft, a step surface is formed at the joint of the second connecting shaft and the first connecting shaft, the step surface is matched with the side face, far away from the static sliding rail, of the transition piece and the static sliding rail, the transition piece and the static sliding rail are limited between the step surface and the first limiting end, and the movable sliding rail is limited between the transition piece and the second limiting end.

Preferably, the fixed slide rail is provided with a positioning plate for blocking the movable slide rail from rotating, when the movable slide rail rotates to a position matched with the positioning plate in a limiting way, the surface of the movable slide rail is flush with the surface of the fixed slide rail, and the movable slide rail extends out of the side plate.

Preferably, still including installing the locking piece on the curb plate, be equipped with the locking hole on the locking piece, be equipped with on the pulling portion outside of moving the slide rail and lock the convex closure with locking hole complex, when moving the slide rail and rotating to folding closed position, move the slide rail and rotate to the curb plate in, it is spacing that locking convex closure card goes into the locking hole.

Preferably, the static sliding rail comprises a first mounting plate, a second mounting plate and a third mounting plate, the first mounting plate and the third mounting plate are arranged on the same plane, the second mounting plate is connected with the first mounting plate and the third mounting plate through bending plates respectively, the third mounting plate is provided with a first connecting hole matched with the connecting piece, the transition piece is arranged on the third mounting plate, the bending plates connected between the third mounting plate and the second mounting plate are in limit fit with the transition piece, and the static sliding rail surface is arranged on the second mounting plate.

Preferably, the locking piece is including the first structure, the second structure, the third structure and the fourth structure of rolling over that connect gradually, first structure has the fastening hole, and the second is rolled over the structure and is the oblique angle setting with first structure, the locking hole sets up structurally at the second book, the third structure is equipped with the operation surface, and the operation surface has bending structure between the structure with the second book, and the third structure is kept away from the second and is rolled over structure one side and fourth book structrual joint.

The utility model discloses a slide rail device of universal circuit breaker, accept transition circuit breaker body through the transition face, can prevent that circuit breaker body card from going into in the movement clearance, because move the slide rail open with folding in-process and the quiet slide rail between have the movement clearance, lead to also having the clearance between slide rail face and the quiet slide rail face, accept the transitional action in the face of circuit breaker body through the transition, not only can ensure that the circuit breaker body can not block into the movement clearance at the in-process that gets into quiet slide rail face, and transition piece direct mount is on quiet slide rail, still have simple structure, part quantity is few and characteristics with low costs.

In addition, the static slide rail, the transition piece and the movable slide rail are connected together through the connecting piece, so that the problem that a plurality of parts are accumulated with more errors after being assembled respectively can be avoided, and the assembly consistency is further improved.

Drawings

Fig. 1 is a schematic structural view of a drawer base of the present invention;

FIG. 2 is a schematic view of the side plate of the present invention;

FIG. 3 is a schematic view of the structure of the roller and the support member of the present invention;

FIG. 4 is a schematic view of the transition surface, the static slide rail surface and the movable slide rail surface of the present invention;

fig. 5 is a schematic view of the transition piece, the static slide rail and the dynamic slide rail of the present invention;

fig. 6 is a schematic structural diagram of the connecting member of the present invention;

fig. 7 is a schematic structural view of the stationary slide rail of the present invention;

fig. 8 is a side view of the stationary slide rail of the present invention;

fig. 9 is a schematic structural view of the movable slide rail of the present invention;

fig. 10 is a schematic view of the transition piece and the stationary slide rail of the present invention;

FIG. 11 is a schematic view of the transition piece of the present invention;

fig. 12 is a schematic view of the locking member of the present invention;

fig. 13 is a schematic motion diagram of the movable slide rail of the present invention;

fig. 14 is a partial schematic view of another perspective view of fig. 13 according to the present invention.

Detailed Description

The following provides an embodiment of the slide rail device of the universal circuit breaker according to the present invention with reference to the accompanying drawings. The slide rail device of the universal circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-4, the utility model discloses a slide rail device of universal circuit breaker, install including quiet slide rail 121 and rotation move slide rail 123 on the quiet slide rail 121, quiet slide rail 121 with move slide rail 123 on be equipped with respectively with circuit breaker body sliding fit's quiet slide rail face 1213 and move slide rail face 1232, it can drive to move slide rail face 1232 and rotate to flushing with quiet slide rail face 1213 to move slide rail 123, quiet slide rail 121 with move and be equipped with movement gap 120 between the slide rail 123, movement gap 120 is used for dodging move slide rail 123, be equipped with transition piece 122 in movement gap 120's side, be equipped with on the transition piece 122 with circuit breaker body sliding fit's transition face 1221.

The utility model discloses a slide rail device of conventional circuit breaker, accept the transition circuit breaker body through transition face 1221, can prevent that circuit breaker body card from going into in the movement clearance 120, because move slide rail 123 open with folding in-process and quiet slide rail 121 between have movement clearance 120, lead to also having the clearance between slide rail face 1232 and the quiet slide rail face 1213, accept the transition effect to the circuit breaker body through transition face 1221, not only can ensure that the circuit breaker body can not go into movement clearance 120 at the in-process card that gets into quiet slide rail face 1213, and transition piece 122 direct mount is on quiet slide rail 121, and the steam generator is simple in structure, the part is small in quantity and characteristics with low costs.

As shown in fig. 1 to 3, the universal circuit breaker includes a drawer base 111, the drawer base 111 is provided with a bottom plate 112 and two side plates 11, the circuit breaker body can be inserted between the two side plates 11, the inner side walls of the two side plates 11 are respectively provided with a sliding rail device, two sides of the circuit breaker body are respectively provided with a roller 21 in sliding fit with the sliding rail device, the roller 21 is firstly placed on a movable sliding rail surface 1232, and then slides into a static sliding rail surface 1213 through a transition surface 1221.

As shown in fig. 3, a support is arranged on the circuit breaker body, the roller 21 is rotatably arranged on the support, the cross section of the support is T-shaped, the support includes a support shaft 22 and a pivot shaft 23, the support shaft 22 is connected with the pivot shaft 23, the roller 21 is rotatably mounted on the pivot shaft 23, the support shaft 22 is located on one side of the axis of the roller 21, the outer diameter of the support shaft 22 is greater than the outer diameter of the roller 21, the static sliding rail surface 1213 and the movable sliding rail surface 1232 are respectively matched with the roller 21, the transition surface 1221 is matched with the support shaft 22 of the support, and the height of the transition surface 1221 is less than the height of the static sliding rail surface 1213. The roller 21 is first placed on the movable sliding rail surface 1232, and when the roller 21 reaches the moving gap 120, the supporting shaft 22 of the support is in contact with the transition surface 1221 until the roller 21 can be in contact with the stationary sliding rail surface 1213.

It is understood that if the width of the roller 21 is increased, the transition surface 1221 may be in contact with the roller 21 instead of in contact with the supporting member when passing through the moving gap 120, and the height of the transition surface 1221 may be flush with the height of the static sliding rail surface 1213, which falls within the protection scope of the present invention.

As shown in fig. 5 to 6, the slide rail device further includes a connecting member 124 passing through the static slide rail 121, the transition member 122 and the movable slide rail 123 are respectively rotatably disposed on the connecting member 124, a limiting structure for blocking the transition member 122 from rotating is disposed on the static slide rail 121, the transition member 122 and the movable slide rail 123 are connected together through the connecting member 124, which can prevent a plurality of parts from accumulating more errors after being assembled respectively, and further improve the assembly consistency. Of course, the transition piece 122 may be separately and fixedly installed on the stationary slide rail 121, and the movable slide rail 123 may also be separately and rotatably installed on the stationary slide rail 121, which all belong to the protection scope of the present invention. Referring to fig. 13, the movable slide rail 123 is rotatably installed at one end of the stationary slide rail 121, and the movable slide rail 123 can be rotated, folded, or unfolded by rotating the movable slide rail 123 by a certain angle to slide the circuit breaker body.

Specifically, the connecting piece 124 is a rivet, the connecting piece 124 includes a first limiting end 1241 and a second limiting end 1242, and a first connecting shaft 1243 and a second connecting shaft 1244 coaxially disposed between the first limiting end 1241 and the second limiting end 1242, the first connecting shaft 1243 can respectively pass through the static slide rail 121 and the transition piece 122, the second connecting shaft 1244 can pass through the movable slide rail 123, the radius of the second connecting shaft 1244 is greater than that of the first connecting shaft 1243, a step face 1245 is formed at a connection portion of the second connecting shaft 1244 and the first connecting shaft 1243, the step face 1245 is matched with a side face of the transition piece 122 far away from the static slide rail 121, the transition piece 122 and the static slide rail 121 are limited between the step face 1245 and the first limiting end 1, and the movable slide rail 123 is limited between the transition piece 122 and the second limiting end 1242.

As shown in fig. 7-8, the static sliding rail 121 includes at least two mounting plates located on different planes, and a bending plate 1216 connected between the at least two mounting plates, the transition piece 122 is mounted on one of the mounting plates, the bending plate 1216 constitutes the limiting structure for blocking the transition piece 122 from rotating, the transition piece 122 can be limited by directly using the existing bending plate 1216 on the static sliding rail 121, and the structure can be further simplified.

As shown in fig. 10 to 11, the transition piece 122 is of a plate-like structure and is arranged in parallel with one of the mounting plates, the transition surface 1221 is arranged at the top side of the transition piece 122, the middle part of the transition piece 122 is provided with a second connecting hole 1223 matched with the connecting piece 124, the side of the transition piece 122 close to one side of the bent plate 1216 is provided with a limiting groove 1222, and the limiting groove 1222 can be sleeved on the bent plate 1216 for limiting and matching. Block transition piece 122 through the spacing groove 1222 card to the static slide rail 121 on and rotate, and then reliably install transition piece 122 on static slide rail 121, have simple structure and convenient assembling's characteristics. It can be understood that, the transition piece 122 may also be inserted into the static slide rail 121 through a protrusion to limit the position instead of the limit groove 1222, or may be rotated by the transition piece 122 limited by riveting and bonding, which all belong to the protection scope of the present invention.

Specifically, the static slide rail 121 is formed by bending a metal plate, the static slide rail 121 includes three mounting plates, the three mounting plates are a first mounting plate 1211, a second mounting plate 1219 and a third mounting plate 1217, the first mounting plate 1211 and the third mounting plate 1217 are disposed in the same plane, the second mounting plate 1219 is connected to the first mounting plate 1211 and the third mounting plate 1217 through a bending plate 1216, the first mounting plate 1211 and the third mounting plate 1217 are respectively embedded in a square hole of the side plate 11 to perform positioning and reinforcing functions, the third mounting plate 1217 is provided with a first connecting hole 1218 which is matched with the connecting piece 124, the transition piece 122 is mounted on the third mounting plate 1217, the bending plate 1216 which is connected between the third mounting plate 1217 and the second mounting plate 1219 is configured to be in limit fit with the transition piece 122, the second mounting plate 1219 is provided with a mounting hole 1212, a static slide rail surface 1213 and a positioning plate 1214, the mounting hole 1212 is mounted on the side plate 11 through a screw, the positioning plate 1214 is used for blocking the rotation of the dynamic slide rail 123, and the positioning plate 1232 can block the static slide rail from being flush with the static slide rail 1213. When the movable sliding rail 123 rotates to the position in limit cooperation with the positioning plate 1214, the movable sliding rail surface 1232 is flush with the static sliding rail surface 1213, and the movable sliding rail 123 extends to the outside of the side plate 11.

As shown in fig. 9, the movable slide rail 123 is a plate-shaped structure, a movable slide rail surface 1232 is disposed above the movable slide rail 123, one end of the movable slide rail 123 has a third connecting hole 1233, a positioning surface 1234 matched with the positioning plate 1214 on the stationary slide rail 121 is disposed above the outer side of the third connecting hole 1233, and the other end of the movable slide rail 123 has a pulling portion 1235, where the pulling portion 1235 is used for driving the movable slide rail 123 to rotate when the movable slide rail 123 is manually opened/closed.

As shown in fig. 12 to 14, the slide rail structure further includes a locking member 13 installed on the side plate 11, the locking member 13 is provided with a locking hole 132, the outside of the pulling portion 1235 of the movable slide rail 123 is provided with a locking convex hull 1231 matched with the locking hole 132, when the movable slide rail 123 rotates to the folding closed position, the movable slide rail 123 rotates into the side plate 11, the locking convex hull 1231 can be clamped into the locking hole 132 for limiting, so as to prevent the movable slide rail 123 from being automatically opened, at this time, the movable slide rail surface 1232 and the static slide rail surface 1213 form an acute angle, a right angle or an obtuse angle, and in this embodiment, the movable slide rail 123 rotates to the folding closed position when the movable slide rail surface 1232 is perpendicular to the static slide rail surface 1213.

Specifically, locking piece 13 includes the four-fold structure, and the four-fold structure is the first fold structure, the second that connect gradually respectively, folds structure, third fold structure and fourth fold structure, first fold structure has fastening hole 131, and locking piece 13 is fixed in on curb plate 11 through fastening hole 131, and the second is rolled over the structure and is the oblique angle setting with first fold structure, locking hole 132 sets up at the second and rolls over structurally, and locking hole 132 cooperatees with the locking convex closure 1231 that moves slide rail 123, accomplishes locking and unblock position, the third fold structure is equipped with operation face 134, and operation face 134 and second are rolled over and have bending structure 133 between the structure, and the third fold structure is kept away from the second and is rolled over structure one side and fourth fold structrual joint. Before the movable slide rail 123 rotates to the folding closed position, the locking convex hull 1231 contacts with the operation surface 134 of the locking piece 13, the locking piece 13 is deformed by pressure along with continuous rotation, when the locking convex hull 1231 crosses the bending structure 133, the pressure disappears and the locking piece 13 rebounds, the locking convex hull 1231 of the movable slide rail 123 is just clamped in the locking hole 132 of the locking piece 13, the position locking is completed, meanwhile, the connecting convex lobe 1215 of the static slide rail 121 contacts with the movable slide rail surface 1232 of the movable slide rail 123 to limit the folding angle of the movable slide rail 123, and the folding action is stopped; when the movable sliding rail 123 needs to be opened, the operating surface 134 of the locking part 13 needs to be pressed by hand, so that the locking convex hull 231 of the movable sliding rail 123 slides out of the locking hole 132, the position lock is released, the movable sliding rail 123 can be rotated to the opening position parallel to the fixed sliding rail 121, the movable sliding rail surface 1232 is rotated to be flush with the fixed sliding rail surface 1213, and the movable sliding rail 123 extends out of the side plate 11.

When the movable slide rail 123 is opened to be in contact with the positioning plate 1214, the roller 21 is placed on the movable slide rail 123, the roller 21 is in contact rolling with the movable slide rail surface 1232 of the movable slide rail 123, the support piece is matched with the side surface of the movable slide rail 123, then the circuit breaker body is pushed inwards, the circuit breaker body rolls and moves forward under the action of the front and back rollers 21, when the roller 21 passes through the movement gap 120 between the movable slide rail 123 and the static slide rail 121, the support shaft 22 is in contact with the transition surface 1221, after the roller 21 enters the static slide rail 121, because the static slide rail 121 is symmetrical up and down along the center, the slide way is limited between the two transversely arranged static slide rail surfaces 1213, a clamping gap is formed between the static slide rail surfaces 1213 and the drawer seat side plate 11, the support piece can be placed in the clamping gap to form axial stop matching, at the moment, the movement position of the circuit breaker body is limited, and the situation that the left-right deviation in the horizontal direction cannot occur when the left-right force of the swinging mechanism is not uniform or otherwise occurs can not occur.

It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship that is usually placed when used, and are only for convenience of description, but do not indicate that the device or element that is referred to must have a specific orientation, and thus, should not be construed as limiting the present invention. Moreover, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating relative importance.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model discloses to the ordinary skilled person in technical field's the prerequisite that does not deviate from the utility model discloses under the design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. The utility model provides a slide rail device of universal circuit breaker which characterized in that: quiet slide rail (121) and rotation are installed move slide rail (123) on quiet slide rail (121), quiet slide rail (121) with move slide rail (123) on be equipped with respectively with circuit breaker body sliding fit's quiet slide rail face (1213) and move slide rail face (1232), move slide rail (123) and can drive and move slide rail face (1232) and rotate to flushing with quiet slide rail face (1213), quiet slide rail (121) and move and be equipped with movement gap (120) between slide rail (123), be equipped with transition piece (122) in the side of movement gap (120), be equipped with on transition piece (122) with circuit breaker body sliding fit's transition face (1221).

2. The sliding rail device of a universal circuit breaker according to claim 1, wherein: be equipped with support on the circuit breaker body, be equipped with pivoted roller (21) on support, support has back shaft (22) that is located roller (21) axis one side, and the external diameter of back shaft (22) is greater than the external diameter of roller (21), quiet slide rail face (1213) and movable slide rail face (1232) respectively with roller (21) cooperation, transition face (1221) with support shaft (22) cooperation of support, the height of transition face (1221) is less than the height of quiet slide rail face (1213).

3. The sliding rail device of a universal circuit breaker according to claim 1, wherein: the transition piece (122) and the movable sliding rail (123) are respectively rotatably arranged on the connecting piece (124), and a limiting structure used for blocking the transition piece (122) from rotating is arranged on the static sliding rail (121).

4. The sliding rail device of a conventional circuit breaker according to claim 3, wherein: the static sliding rail (121) comprises at least two mounting plates located on different planes and a bending plate (1216) connected between the at least two mounting plates, the transition piece (122) is mounted on one of the mounting plates, and the bending plate (1216) forms the limiting structure.

5. The sliding rail device of universal circuit breaker according to claim 4, characterized in that: the transition piece (122) is arranged in parallel with one of the mounting plates, a limit groove (1222) is arranged on the side edge of one side, close to the bending plate (1216), of the transition piece (122), and the limit groove (1222) can be sleeved on the bending plate (1216) to be matched in a limiting mode.

6. The sliding rail apparatus of universal circuit breaker according to claim 3, wherein: the connecting piece (124) comprises a first limiting end (1241), a second limiting end (1242), a first connecting shaft (1243) and a second connecting shaft (1244) which are coaxially arranged between the first limiting end (1241) and the second limiting end (1242), wherein the first connecting shaft (1243) can penetrate through the static slide rail (121) and the transition piece (122), the second connecting shaft (1244) can penetrate through the movable slide rail (123), the radius of the second connecting shaft (1244) is larger than that of the first connecting shaft (1243), a step surface (1245) is formed at the connecting position of the second connecting shaft (1244) and the first connecting shaft (1243), the step surface (1245) is matched with the side face of the transition piece (122) far away from the static slide rail (121), the transition piece (122) and the static slide rail (121) are limited between the step surface (1245) and the first limiting end (1241), and the movable slide rail (123) is limited between the transition piece (122) and the second limiting end (1242).

7. The sliding rail device of a universal circuit breaker according to claim 1, wherein: be equipped with on quiet slide rail (121) and be used for blockking move slide rail (123) pivoted locating plate (1214), move slide rail (123) and rotate when reaching the position with locating plate (1214) spacing complex, move slide rail face (1232) and flush with quiet slide rail face (1213), move slide rail (123) and extend outside curb plate (11).

8. The sliding rail apparatus of universal circuit breaker according to claim 1, wherein: still including installing locking piece (13) on curb plate (11), be equipped with locking hole (132) on locking piece (13), be equipped with on pulling portion (1235) the outside of moving slide rail (123) with locking hole (132) complex locking convex closure (1231), move slide rail (123) and rotate to folding when closing the position, move slide rail (123) and rotate to curb plate (11) in, it is spacing that locking convex closure (1231) card goes into locking hole (132).

9. The sliding rail apparatus of universal circuit breaker according to claim 1, wherein: the static sliding rail (121) comprises a first mounting plate (1211), a second mounting plate (1219) and a third mounting plate (1217), the first mounting plate (1211) and the third mounting plate (1217) are arranged on the same plane, the second mounting plate (1219) is connected with the first mounting plate (1211) and the third mounting plate (1217) through a bending plate (1216), the third mounting plate (1217) is provided with a first connecting hole (1218) matched with the connecting piece (124), the transition piece (122) is arranged on the third mounting plate (1217), the bending plate (1216) connected between the third mounting plate (1217) and the second mounting plate (1219) forms a limit fit with the transition piece (122), and the static sliding rail surface (1213) is arranged on the second mounting plate (1219).

10. The sliding rail apparatus of universal circuit breaker according to claim 8, wherein: locking piece (13) are including the first book structure, the second that connect gradually, the structure is rolled over to the third structure and the fourth structure of rolling over, the first structure of rolling over has fastening hole (131), and the second is rolled over the structure and is the oblique angle setting with first structure of rolling over, locking hole (132) set up and are rolled over structurally at the second, the third structure of rolling over is equipped with operation face (134), and operation face (134) and second are rolled over and have bending structure (133) between the structure, and the third structure of rolling over is kept away from the second and is rolled over structure one side and fourth book structural connection.

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