CN119369067A - A self-propelled docking platform that takes into account the rolling docking function of cone-section products - Google Patents

Abstract

A self-walking butt-joint platform with cone section product rolling and butt-joint functions relates to the field of cone section assembly, and comprises a first moving platform and a second moving platform which are identical in structure, wherein the first moving platform and the second moving platform comprise an upper wrapping ring, a lower wrapping ring, a rolling support and a gesture adjusting mechanism, the gesture adjusting mechanism is connected to the surface of a self-walking vehicle in a sliding mode along the X direction, the rolling support is connected above the gesture adjusting mechanism, the upper wrapping ring and the lower wrapping ring are of semicircular annular structures, annular rolling wrapping rings are formed by connecting open ends of the upper wrapping ring and the lower wrapping ring, an arc-shaped groove is formed in the upper surface of the rolling support, the rolling wrapping rings are placed in the arc-shaped groove, a rolling wheel mechanism is arranged in the arc-shaped groove, the rolling wheel mechanism is in contact with the outer circumferential surface of the rolling wrapping rings and used for driving the rolling wrapping rings to rotate, and the large end outer profile of a cone-shaped workpiece is matched with the rolling wrapping rings of the second moving platform, and the small end outer profile is matched with the rolling wrapping rings of the first moving platform. The automatic rolling and butting functions are considered, and the multi-degree-of-freedom gesture adjusting function is achieved.

Description

Self-walking docking platform with cone product rolling docking function

Technical Field

The invention belongs to the technical field of barrel section assembly, is applied to automatic rolling, butt joint and transfer of barrel sections, and is an automatic butt joint transfer system for cone sections, which has the characteristics of high flexibility and high precision.

Background

In the assembly process, the trolley on the adjusting rail is used for butt joint. The butt-joint trolley is generally used in pairs, and the unified zero height is maintained, so that good stress is ensured when supporting products. In some component assembly processes, the product is often inverted using a hanger, and then placed on a new holder for operation.

In the final assembly test process of the product, the faced difficulties are that the supporting positions are limited, no hole site can be connected, the traditional trolley support structure has the risk of sliding, the overturning lifting appliance has no reliable grabbing point, the overturning is not feasible by virtue of the lifting appliance, and the like. The traditional process flow is required to be matched with a turnover lifting appliance, a horizontal bracket and the like so as to meet the assembly requirement. In order to reduce the manufacturing cost, shorten the production cycle of the tool, simplify the process flow, improve the working efficiency and the adaptability of the tool, and design a self-walking docking platform with the automatic rolling and docking functions.

Disclosure of Invention

The application solves the technical problems of overcoming the defects of the prior art, providing the self-walking docking platform with the function of rolling and docking the cone-section products, having the functions of automatic rolling and docking, having the function of adjusting the gesture with multiple degrees of freedom, having the function of 360 degrees of rolling, reducing the design of a lifting appliance and optimizing the technological process.

The technical scheme provided by the application is as follows:

A self-walking docking platform with a cone-section product rolling docking function comprises a first moving platform and a second moving platform, wherein the first moving platform and the second moving platform are connected to the surface of a self-walking cart in a sliding mode along the same straight line direction, the first moving platform and the second moving platform are identical in structure, the self-walking docking platform comprises an upper wrapping ring, a lower wrapping ring, a rolling support and an attitude adjusting mechanism, the attitude adjusting mechanism is connected to the surface of the self-walking cart in a sliding mode along the X direction, the rolling support is connected to the upper side of the attitude adjusting mechanism, the attitude adjusting mechanism is used for driving the rolling support to vertically lift along the Z direction and driving the rolling support to move along the Y direction, the upper wrapping ring and the lower wrapping ring are of semicircular annular structures, the upper surface of the rolling support is provided with an arc-shaped surface, the upper surface of the rolling support is provided with an arc-shaped groove, the rolling wrapping ring is placed in the arc-shaped groove, the rolling wheel mechanism is connected with the outer circumferential surface of the rolling wrapping ring and is used for driving the rolling support to rotate along the Z direction, and the upper wrapping ring and the lower wrapping ring is used for driving the outer circumferential surface of the rolling ring of the rolling support, and the rolling support is in a small rolling ring is matched with the outer diameter of the second rolling ring of the first rolling surface and the second rolling surface of the rolling platform.

The rolling wheel mechanism comprises an active rolling wheel and a passive rolling wheel, the active rolling wheel is rotationally connected in an arc-shaped groove of the rolling support, the active rolling wheel is connected with a driving motor, the driving motor drives the active rolling wheel to rotate, the passive rolling wheel is rotationally connected in the arc-shaped groove of the rolling support, and the rotation axes of the active rolling wheel and the passive rolling wheel are parallel to the rotation axis of the rolling wrapping ring in the arc-shaped groove.

The middle part of the arc-shaped groove of the rolling support is connected with a plurality of groups of rolling positioning devices, each group of rolling positioning devices is located between an active rolling wheel and a passive rolling wheel and comprises two positioning assemblies, the two positioning assemblies are respectively arranged at two ends of the rolling support and comprise positioning bearings, the outer circular surfaces of the positioning bearings and the rolling support rotate relatively, the outer circular surfaces of the positioning bearings are opposite to the end surfaces of the rolling wrapping rings, and the rotating axes of the outer circular surfaces of the positioning bearings are along the radial direction of the arc-shaped groove of the rolling support.

The positioning assembly further comprises a positioning shell, a positioning shaft and a fixing nut, the positioning shell is fixedly connected to the rolling support, one end, facing the arc-shaped groove, of the positioning shell is provided with a mounting plate in the middle of the mounting groove, the positioning shaft is fixed with a ring of the positioning bearing, the positioning shaft penetrates through the mounting plate, and the fixing nut is in threaded connection with the positioning shaft, so that the positioning shaft and the positioning bearing are mounted on the mounting plate.

The rolling support is provided with a mounting hole, one end of the positioning shell is connected with the convex edge, the positioning shell penetrates out of the mounting hole to the outside of the arc-shaped groove of the rolling support, the convex edge is clamped in the arc-shaped groove of the rolling support, and the convex edge is fixedly connected with the rolling support through bolts.

The two ends of the two end surfaces of the upper wrapping ring and the lower wrapping ring are respectively provided with a first supporting lug, the two end positions of the two end surfaces of the rolling support are respectively connected with a tensioning device, and the tensioning devices are detachably connected with the first supporting lugs connected with the upper wrapping ring or the lower wrapping ring.

The tensioning device comprises a pin shaft, a nut, a first screw rod, a second screw rod and a second support lug, wherein the second support lug is fixedly connected to the end face of the rolling support, the first screw rod is connected to the second support lug through the pin shaft, the nut is sleeved on the first screw rod and the second screw rod, the other end of the second screw rod is detachably connected to the first support lug through the pin shaft, the nut rotates, and the distance between the first screw rod and the second screw rod is increased or decreased.

The rolling support of the second moving platform is connected with a backstop mechanism at one side deviating from the first moving platform, and the backstop mechanism is used for propping against the large end face of the conical workpiece.

The retaining mechanism comprises a retaining bracket, a front section connecting seat, a rear section screw rod and hexagonal nuts, wherein the front section connecting seat and the rear section screw rod are connected in a welded mode, the front section connecting seat is connected to the rolling bracket, the retaining bracket is sleeved outside the rear section screw rod, the two hexagonal nuts are connected to the rear section screw rod in a threaded mode, and the two hexagonal nuts are arranged on two sides of the retaining bracket in a separated mode.

In summary, the application at least comprises the following beneficial technical effects:

1. the wrapping ring type rolling structure and the structure form combined with the gesture adjusting mechanism are taken into consideration;

2. the novel docking platform combined with the self-walking vehicle can realize the assembly function and the transfer function.

Drawings

FIG. 1 is a schematic diagram of the overall structure;

FIG. 2 is a front view of a first mobile platform structure;

FIG. 3 is a schematic structural view of the retracting mechanism;

FIG. 4 is a cross-sectional view of a roll positioning device;

FIG. 5 is a cross-sectional view of a passive scroll wheel;

fig. 6 is a cross-sectional view of the in-place positioning device.

The reference numerals indicate that 1, a first moving platform, 2, a second moving platform, 3, a backstop mechanism, 4, a self-propelled carriage, 5, a rolling positioning device, 6, a rolling wheel mechanism and 7, a positioning device in place;

11. A wrapping ring is arranged; 12 parts of lower wrapping ring, 13 parts of rolling support, 15 parts of gesture adjusting mechanism;

31. a retaining bracket; 32, a front section connecting seat, 33, a rear section lead screw, 34, a hexagonal nut;

51. positioning shell, 52, positioning bearing, 53, positioning shaft, 54, fixing nut;

61. the device comprises an active rolling wheel, a passive rolling wheel, 63, an annular groove, 14 and a rolling motor;

71. pin shaft 72, nut 73, first screw rod 74, second screw rod 75, first support lug 76 and second support lug.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention disclosed herein will be described in further detail with reference to the accompanying drawings.

The embodiment of the application discloses a self-walking docking platform with cone product rolling docking function, which comprises a first mobile platform 1 and a second mobile platform 2, as shown in fig. 1, wherein the first mobile platform 1 and the second mobile platform 2 are slidably connected to the surface of a self-walking carriage 4 along the same linear direction.

As shown in fig. 2, the first moving platform and the second moving platform have the same structure, and each of the first moving platform and the second moving platform comprises an upper wrapping ring 11, a lower wrapping ring 12, a rolling support 13, a rolling motor 14 and a gesture adjusting mechanism 15, wherein the gesture adjusting mechanism 15 is slidably connected to the surface of the bicycle (the sliding direction is the X direction), the rolling support 13 is connected above the gesture adjusting mechanism 15, and the gesture adjusting mechanism 15 is used for driving the rolling support 13 to lift (Z direction) along the vertical direction and driving the rolling support 13 to move along the Y direction, which is perpendicular to both the X direction and the Z direction. The upper wrapping ring 11 and the lower wrapping ring 12 are of semicircular annular structures, the opening ends of the upper wrapping ring 11 and the lower wrapping ring 12 are detachably connected to form an annular rolling wrapping ring, the upper surface of the rolling support 13 is an arc-shaped surface, an arc-shaped groove is formed in the upper surface of the rolling support 13, and the rolling wrapping ring is placed in the arc-shaped groove.

Three sets of rolling positioning devices 5 are connected in the middle of the arc-shaped groove of the rolling bracket 13. The arc-shaped groove of the rolling bracket 13 is provided with a rolling wheel mechanism 6, the rolling wheel mechanism 6 comprises an active rolling wheel 61 and a passive rolling wheel 62, and the active rolling wheel 61 and the passive rolling wheel 62 are respectively positioned at two ends of the three groups of rolling positioning devices 5. The outer circumferential surface of the rolling wrapping ring is a rolling surface and is contacted with a rolling wheel mechanism 6 arranged in the rolling bracket 3, and the inner circumferential surface of the rolling wrapping ring is a supporting surface and is attached to the outer molded surface of the conical product. The rolling positioning device 5 is contacted with two end surfaces of the rolling bracket 13 along the axis direction of the rolling bracket, and plays a role in guiding. The upper wrapping ring11 and the lower wrapping ring 12 are connected in a plug-in and screw-on pin positioning mode, so that tight connection and no deviation are ensured. The key point of the rolling wrapping ring is that the center of a circle needs to be kept coincident with the theoretical mass center of the product, and the rolling function is invalid due to eccentricity. The front view of the wrapping ring structure is shown as 2.

This patent is used for rolling the butt joint to the toper work piece, and the external diameter and the internal diameter of the roll packing ring of first moving platform are less than the external diameter and the internal diameter of the roll packing ring of second moving platform for the outer profile of big end of toper work piece cooperates with the roll packing ring of second moving platform, and the outer profile of little end of toper work piece cooperates with the roll packing ring of first moving platform.

Fig. 4 shows a rolling positioning device 5, each group of rolling positioning device 5 comprises two positioning components, the two positioning components are respectively arranged at two ends of a rolling bracket 13, each positioning component comprises a positioning shell 51, a positioning bearing 52, a positioning shaft 53 and a fixing nut 54, the rolling bracket 13 is provided with a mounting hole, one end of the positioning shell 51 is connected with a convex edge, the positioning shell 51 penetrates out of an arc-shaped groove of the rolling bracket 13 from the mounting hole, the convex edge is clamped in the arc-shaped groove of the rolling bracket 13 and is fixedly connected with the rolling bracket 13 through a bolt, one end of the positioning shell 51, which faces the arc-shaped groove, is provided with a mounting plate in the middle of the mounting groove, the positioning shaft 53 is fixed with a ring of the positioning bearing 52, the positioning shaft 53 penetrates through the mounting plate, the fixing nut 54 is connected with the positioning shaft 53 in a threaded manner so that the positioning shaft 53 and the positioning bearing 52 are mounted on the mounting plate, and the rotation axis of each positioning bearing 52 is along the radial direction of the arc-shaped groove of the rolling bracket 13. The outer ring of the positioning bearing 52 is opposite to the end face of the rolling packing ring, and when the rolling packing ring is in contact with the positioning bearing 52, the outer ring of the positioning bearing 52 can rotate along with the rolling of the rolling packing ring, so that the rolling process of the rolling packing ring is carried out along a fixed track without obvious shaking.

Fig. 5 shows a rolling wheel mechanism 6, an active rolling wheel 61 is rotatably connected in an arc-shaped groove of a rolling bracket 13, the active rolling wheel 61 is connected with a rolling motor 14, the rolling motor 14 drives the active rolling wheel 61 to rotate, a passive rolling wheel 62 is rotatably connected in the arc-shaped groove of the rolling bracket 13, and the rotation axes of the active rolling wheel 61 and the passive rolling wheel 62 are parallel to the rotation axis of a rolling bag ring in the arc-shaped groove. When the rolling packing ring is in the arc-shaped groove, the outer circumferential surface of the rolling packing ring is in contact with the outer circumferential surfaces of the driving rolling wheel 61 and the driven rolling wheel 62, so that the driving rolling wheel 61 can rotate to drive the rolling packing ring to rotate, the middle parts of the outer circumferential surfaces of the driving rolling wheel 61 and the driven rolling wheel 62 are sunken to present an annular groove, the rolling packing ring is positioned in the annular groove, and the rolling packing ring can be further guaranteed to have no overturning risk in the rolling process.

The inner side of the rolling bracket 13 has a gap of 0.5mm with the end face of the rolling wrapping ring.

Fig. 6 shows a positioning device 7 in place, a positioning device 7 in place is arranged between a rolling wrapping ring and a rolling bracket 13, the positioning device 7 in place comprises a tensioning device and first lugs 75, an upper wrapping ring 11 and a lower wrapping ring 12 are respectively provided with four first lugs 75 of the positioning device in place, namely, two ends of two end faces of the upper wrapping ring 11 are respectively provided with one first lug 75, and two ends of two end faces of the lower wrapping ring 12 are respectively provided with one first lug 75. The number of the tensioning devices is 4, and the two ends of the two end surfaces of the rolling bracket 13 are respectively connected with one tensioning device. The tensioning device comprises a pin shaft 71, a nut 72, a first screw rod 73, a second screw rod 74 and a second support lug 76, wherein the second support lug 76 is fixedly connected to the end face of the rolling support 13, the first screw rod 73 is connected to the second support lug 76 through the pin shaft, the nut 72 is sleeved on the first screw rod 73 and the second screw rod 74, the other end of the second screw rod 74 is detachably connected to the first support lug 75 through the pin shaft 71, the nut 72 rotates, and the distance between the first screw rod 73 and the second screw rod 74 is increased or decreased. After the first lugs of the upper wrapping ring 11 are connected with the tensioning device for butt joint, when other products are required to be installed on the top of the rolling wrapping ring, the rolling wrapping ring is turned 180 degrees, so that the first lugs 75 of the lower wrapping ring 12 are connected with the tensioning device, and the rolling wrapping ring can be positioned by turning 180 degrees. The product is turned over and then connected with a tensioning device to prevent the rolling wrapping ring from rolling.

Further, the rolling support 13 of the second moving platform is connected with a stopping mechanism 3 at one side deviating from the first moving platform, the stopping mechanism 3 is used for propping against the large end face of the conical workpiece, and the position stability of the conical workpiece can be ensured in the non-rolling process.

In fig. 3, the stopping mechanism 3 includes a stopping bracket 31, a front connecting seat 32, a rear screw 33 and a hexagonal nut 34, the front connecting seat 32 and the rear screw 33 are welded to each other, and the front connecting seat 32 is detachably connected to the rolling bracket 13. The retaining bracket 31 is sleeved outside the rear-section screw rod 33, two hexagonal nuts 34 are in threaded connection with the rear-section screw rod 33, the two hexagonal nuts 34 are respectively arranged on two sides of the retaining bracket 31, and the retaining bracket 31 is clamped through the two hexagonal nuts 34 to realize the retaining and anti-falling effects. The position of the retaining bracket 31 in different states can be adjusted by rotating the hexagonal nut 34. In order to reduce the weight, the front section connecting seat 32 is convenient to disassemble and install manually, and is in a thick-wall hollow form.

The rolling of products with large conicity needs to consider the risk of product falling off in the rolling process, so for products with large conicity and special-shaped surfaces, the related butt-joint trolley not only needs to realize the function of a basic trolley, but also needs to ensure the safety of operation. And secondly, the butt joint and rolling integrated trolley is required to be accurately distributed in a limited space, interference among all mechanisms is avoided, and the mechanism is convenient and labor-saving to operate and has no operation risk.

The rolling ladle ring is provided with lifting holes which are independently connected with the lifting rings, and the rolling ladle ring can be lifted and transported by using two symmetrical lightening holes. The upper wrapping ring and the lower wrapping ring can independently support one surface of the product, and the whole ring can realize the operations of rolling, overturning and the like. The rolling packing ring occupies approximately half of the weight of the trolley, so that a corresponding mechanism is arranged to fix the packing ring and enhance the rolling safety of the packing ring.

The butt joint and rolling integrated trolley is characterized in that the manufacturing cost of the overturning lifting appliance is saved. The integrated trolley can meet the requirements of front butt joint, turn-over butt joint, supporting and parking, product turning and the like. The trolley is also provided with remodelling performance, and the main structure (the turnover wrapping ring) is a detachable and replaceable structure, so that the trolley can be suitable for final assembly butt joint of similar products in the future.

In addition, the self-walking carriage at the bottom of the platform can realize that products can be transferred to any appointed position in the factory building, and guided butt joint can be carried out.

What is not described in detail in the present specification is a well known technology to those skilled in the art.

The application has been described in detail in connection with the specific embodiments and exemplary examples thereof, but such description is not to be construed as limiting the application. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these fall within the scope of the present application. The scope of the application is defined by the appended claims.

Claims (9)

1. The self-walking docking platform is characterized by comprising a first moving platform (1) and a second moving platform (2), wherein the first moving platform (1) and the second moving platform (2) are connected to the surface of the self-walking platform in a sliding manner along the same straight line direction, the first moving platform (1) and the second moving platform (2) are identical in structure, each of the first moving platform and the second moving platform comprises an upper wrapping ring (11), a lower wrapping ring (12), a rolling support (13) and a gesture adjusting mechanism (15), the gesture adjusting mechanism (15) is connected to the surface of the self-walking platform in a sliding manner along the X direction, the rolling support (13) is connected to the upper part of the gesture adjusting mechanism (15), the upper wrapping ring (11) and the lower wrapping ring (12) are of semicircular annular structures, the upper wrapping ring (11) and the opening end of the lower wrapping ring (12) are detachably connected to form an annular rolling wrapping ring, the upper surface of the rolling support (13) is an arc-shaped surface, the upper surface of the rolling support (13) is provided with an arc groove, and the rolling wrapping ring is placed in the arc groove;

a rolling wheel mechanism (6) is connected in the arc-shaped groove of the rolling bracket (13), and the rolling wheel mechanism (6) is contacted with the outer circumferential surface of the rolling wrapping ring and is used for driving the rolling wrapping ring to rotate;

The inner diameter of the rolling wrapping ring of the first moving platform is smaller than that of the rolling wrapping ring of the second moving platform, the small-end outer molded surface of the conical workpiece is matched with the rolling wrapping ring of the first moving platform, and the large-end outer molded surface of the conical workpiece is matched with the rolling wrapping ring of the second moving platform.

2. The self-walking docking platform with the cone product rolling docking function according to claim 1, wherein the rolling wheel mechanism (6) comprises an active rolling wheel (61) and a passive rolling wheel (62), the active rolling wheel (61) is rotatably connected in an arc-shaped groove of the rolling support (13), the active rolling wheel (61) is connected with a driving motor, the driving motor drives the active rolling wheel (61) to rotate, the passive rolling wheel (62) is rotatably connected in the arc-shaped groove of the rolling support (13), and the rotation axes of the active rolling wheel (61) and the passive rolling wheel (62) are parallel to the rotation axis of the rolling bag ring in the arc-shaped groove.

3. The self-walking docking platform with the rolling docking function for the cone-section products according to claim 2, wherein a plurality of groups of rolling positioning devices (5) are connected to the middle of the arc-shaped groove of the rolling support (13), the groups of rolling positioning devices (5) are located between the driving rolling wheel (61) and the driven rolling wheel (62), each group of rolling positioning devices (5) comprises two positioning components, the two positioning components are respectively arranged at two ends of the rolling support (13), each positioning component comprises a positioning bearing (52), the outer circular surface of each positioning bearing (52) and the rolling support (13) rotate relatively, the outer circular surface of each positioning bearing (52) faces the end face of the rolling wrapping ring, and the rotation axis of each positioning bearing (52) is along the radial direction of the arc-shaped groove of the corresponding rolling support (13).

4. The self-walking docking platform with the cone product rolling docking function according to claim 3, wherein the positioning assembly further comprises a positioning shell (51), a positioning shaft (53) and a fixing nut (54), the positioning shell (51) is fixedly connected to the rolling support (13), one end of the positioning shell (51) facing the arc-shaped groove is a mounting groove, the positioning shell (51) is provided with a mounting plate in the middle of the mounting groove, the positioning shaft (53) is fixed with a ring of the positioning bearing (52), the positioning shaft (53) penetrates through the mounting plate, and the fixing nut (54) is in threaded connection with the positioning shaft (53) so that the positioning shaft (53) and the positioning bearing (52) are mounted on the mounting plate.

5. The self-walking docking platform with the rolling docking function for cone products according to claim 4, wherein the rolling support (13) is provided with a mounting hole, one end of the positioning shell (51) is connected with a convex edge, the positioning shell (51) penetrates out of the mounting hole to the outside of an arc-shaped groove of the rolling support (13), the convex edge is clamped in the arc-shaped groove of the rolling support (13), and the convex edge is fixedly connected with the rolling support (13) through bolts.

6. The self-walking docking platform with the cone product rolling docking function according to claim 1, wherein the two ends of the two end surfaces of the upper wrapping ring (11) and the lower wrapping ring (12) are respectively provided with a first supporting lug (75), the two end positions of the two end surfaces of the rolling support (13) are respectively connected with a tensioning device, and the tensioning devices are detachably connected with the first supporting lugs (75) connected with the upper wrapping ring (11) or the lower wrapping ring (12).

7. The self-walking docking platform with the cone product rolling docking function according to claim 6, wherein the tensioning device comprises a pin shaft (71), a nut (72), a first screw rod (73), a second screw rod (74) and a second supporting lug (76), the second supporting lug (76) is fixedly connected to the end face of the rolling support (13), the first screw rod (73) is connected to the second supporting lug (76) through the pin shaft, the nut (72) is sleeved on the first screw rod (73) and the second screw rod (74), the other end of the second screw rod (74) is detachably connected to the first supporting lug (75) through the pin shaft (71), the nut (72) rotates, and the distance between the first screw rod (73) and the second screw rod (74) is increased or decreased.

8. The self-walking docking platform with the cone product rolling docking function according to claim 1, wherein the rolling support (13) of the second moving platform is connected with a backstop mechanism (3) at one side, which is away from the first moving platform, of the rolling support, and the backstop mechanism (3) is used for propping against the large end face of the cone workpiece.

9. The self-walking docking platform with the rolling docking function for cone products according to claim 8, wherein the stopping mechanism (3) comprises a stopping bracket (31), a front section connecting seat (32), a rear section screw rod (33) and hexagonal nuts (34), the front section connecting seat (32) and the rear section screw rod (33) are welded, the front section connecting seat (32) is connected to the rolling bracket (13), the stopping bracket (31) is sleeved outside the rear section screw rod (33), two hexagonal nuts (34) are connected to the rear section screw rod (33) in a threaded mode, and the two hexagonal nuts (34) are arranged on two sides of the stopping bracket (31) in a separated mode.