A sorting trolley for a curved cross-belt sorting machine

Abstract

The present invention relates to the field of sorting trolleys, and specifically to a sorting trolley for a curved cross-belt sorting machine, comprising a base, a plurality of movably connected walking and sorting devices are arranged on the top of the base, and the walking and sorting devices can move horizontally along the top of the base, a frame is arranged at the bottom of the walking and sorting devices, and a plurality of adaptive devices are symmetrically arranged on both sides of the frame, two groups of rotatable guide wheels are movably arranged at one end of the adaptive device, and a rotating device is symmetrically arranged at the bottom of the frame, a rotatable fixed block is arranged at the bottom of the rotating device, and a support plate for weighing is arranged on the top of the walking and sorting device. The present application realizes that the guide wheels of the walking and sorting device can automatically adjust to the optimal operating state when turning, and the fixed block can automatically adjust with the rotation angle when the walking and sorting device turns, and the second pressure sensor arranged on the support plate can monitor the position of the items placed on the upper end surface of the walking and sorting device.

Description

Technical Field

[0001] The invention relates to the field of sorting trolleys, and in particular to a sorting trolley of a curved cross-belt sorting machine. Background Art

[0002] The curved cross-belt sorter is an automated sorting equipment based on a conveyor belt. It is usually used in sorting operations in the postal, express, e-commerce, pharmaceutical and other industries. It is usually composed of a feed belt, a cross-belt sorting unit and a control system. When the cross-belt sorter is working, it is moved by the main drive belt conveyor and a trolley carrying a small belt conveyor. When the "trolley" moves to the specified sorting position, it rotates the belt to complete the task of sorting and delivering the goods.

[0003] Chinese patent CN114988029A discloses a sorting trolley of a linear cross-belt sorting machine, comprising a frame and rotating rollers, wherein the rotating rollers comprise an active roller and a driven roller, wherein the active roller and the driven roller are respectively arranged at two ends of the frame, and further comprising a conveyor belt, wherein the conveyor belt is sleeved on the active roller and the driven roller, wherein the frame is provided with a tensioning groove, and further comprising a tensioning mechanism, wherein the tensioning mechanism can change the distance between the active roller and the driven roller, wherein the tensioning mechanism is arranged in the tensioning groove, wherein the tensioning mechanism is arranged in the tensioning groove of the frame, and the tensioning mechanism does not occupy the gap between adjacent sorting trolleys, thereby reducing the gap between adjacent sorting trolleys, and therefore the sorting trolley of the present invention is suitable for goods of smaller size, thereby increasing the applicable scope of the sorting trolley, but the following deficiencies still exist.

[0004] In the prior art, the guide wheels are fixed at both ends of the bottom of the trolley, resulting in the trolley being unable to automatically adjust to changes in the curve when traveling on a curve, and is prone to locking. In addition, the distance between the running wheels at both ends of the trolley is constant, resulting in the running wheels being squeezed when the trolley turns. The running wheels transmit the squeezing force to the frame, which in turn causes the frame to deform. Furthermore, when objects are transported to the trolley, it cannot be ensured that the objects are in the center of the trolley. Therefore, the inventor proposes a sorting trolley with a curved cross-belt sorter to solve the above problems. Summary of the invention

[0005] In view of the above problems, a sorting trolley of a curved cross-belt sorting machine is provided, in which two sets of guide wheels that can move relative to each other are movably arranged at one end of an adaptive device, so that the guide wheels can move along the inside of a limiting groove, and a fixed block is fixed to the upper end surface of a directional transmission belt so that the fixed block moves with the directional transmission belt, and a support plate is arranged on the top of a walking sorting device, and a plurality of second pressure sensors are distributed on the support plate for sensing objects, so that the guide wheels of the walking sorting device can automatically adjust to an optimal operating state when the walking sorting device turns, and the fixed block can adjust itself with the rotation angle when the walking sorting device turns, and the second pressure sensor arranged on the support plate can monitor the position of objects placed on the upper end surface of the walking sorting device, thereby solving the problems that a frame of the walking sorting device is deformed due to track changes when turning, and the position of objects on the surface of the walking sorting device cannot be monitored.

[0006] In order to solve the problems of the prior art, the present invention provides a sorting trolley of a curved cross-belt sorting machine, comprising a base, a plurality of movably connected walking and sorting devices are arranged on the top of the base, and the walking and sorting devices can move horizontally along the top of the base, a frame is arranged on the bottom of the walking and sorting device, and a plurality of adaptive devices are symmetrically arranged on both sides of the frame, two groups of rotatable guide wheels are movably arranged at one end of the adaptive device, and a rotating device is symmetrically arranged at the bottom of the frame, a rotatable fixed block is arranged at the bottom of the rotating device, a support plate for weighing is arranged on the top of the walking and sorting device, and a plurality of second pressure sensors for sensing the position of objects are arranged and distributed on the support plate, so that the guide wheels of the walking and sorting device can automatically adjust to the optimal operating state when turning, and the fixed block can automatically adjust with the rotation angle when the walking and sorting device turns to avoid deformation of the frame due to changes in the moving angle, and the position of objects on the surface of the walking and sorting device can be monitored by the second pressure sensor.

[0007] As a technical solution of the present invention, a swing arm is movably provided at the center of the guide wheel, and one end of the swing arm is movably installed inside one end of the adaptive device so that the swing arm drives the guide wheel to swing horizontally.

[0008] As a technical solution of the present invention, a tension spring is movably installed at the center of the swing arm, and a fixing rod for installing the tension spring is arranged inside the center of the swing arm, so that the tension spring drives the swing arms to move relative to each other.

[0009] As a technical solution of the present invention, two groups of limit rods for installing the swing arm are symmetrically arranged inside one end of the adaptive device to facilitate the swing arm to rotate along the outside of the limit rod.

[0010] As a technical solution of the present invention, a mounting column is arranged on the upper end face of the fixed block, and a metal sleeve for movably mounting the mounting column is vertically arranged on the lower end face of the rotating device, so that the fixed block can rotate along the inside of the metal sleeve to adjust the angle through the mounting column.

[0011] As a technical solution of the present invention, a first pressure sensor is provided at the bottom of the support plate, and the first pressure sensor is fixed at the center inside the walking sorting device, so that the first pressure sensor and the support plate cooperate with each other to weigh the object.

[0012] As a technical solution of the present invention, rollers are rotatably arranged at both ends of the walking and sorting device, and a driven pulley for transmission is arranged at one end of the roller, and a conveyor belt for driving objects to move is installed on the outside of the roller, so that the roller drives the conveyor belt to move.

[0013] As a technical solution of the present invention, a rotating driving member is arranged inside one side of the walking and sorting device, and an intelligent controller capable of controlling the operation of the rotating driving member is arranged inside the walking and sorting device, and the intelligent controller is electrically connected to the first pressure sensor and the second pressure sensor respectively, so that the intelligent controller can control the rotating driving member to start or shut down.

[0014] As a technical solution of the present invention, a driving pulley is provided at the output end of the rotating drive member, and a transmission belt for transmission is provided outside the driving pulley, so that when the rotating drive member drives the driving pulley to rotate, the roller shaft is driven to rotate through the transmission belt and the driven pulley.

[0015] As a technical solution of the present invention, a first fixed frame is provided at one end of the frame, and a second fixed frame is provided at the other end of the frame, and both sides of the walking sorting device are fixed to the top of the first fixed frame and the second fixed frame, so that the frame supports the walking sorting device through the first fixed frame and the second fixed frame.

[0016] As a technical solution of the present invention, a mounting groove is horizontally arranged at the center of the inner side of the base, and a directional transmission belt for fixing the fixed block is movably arranged inside the mounting groove so that the directional transmission belt can drive the fixed block to move.

[0017] As a technical solution of the present invention, limiting grooves for movement of the guide wheels are symmetrically arranged on the inner side of the top of the base, so that the guide wheels can move along the inside of the limiting grooves.

[0018] As a technical solution of the present invention, a cross loading platform for conveying items to a walking sorting device is provided on one side of the base, and a plurality of unloading platforms for exporting items are staggeredly provided on the outside of the other side of the base, so that the walking sorting device can output the items through the unloading platforms according to the weight of the objects.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present application symmetrically arranges a plurality of adaptive devices on both sides of a frame, and movably arranges two groups of guide wheels that can move relative to each other at one end of the adaptive device, so that the guide wheels can move along the inside of the limiting groove, and rotatably arranges a fixed block at the bottom of the rotating device, and fixes the fixed block on the upper end surface of the directional transmission belt, so that when the fixed block moves with the directional transmission belt, the fixed block drives the traveling sorting device to move through the rotating device and the frame, and arranges a support plate on the top of the traveling sorting device, and distributes a plurality of second pressure sensors on the support plate for sensing objects, so that the guide wheels of the traveling sorting device can automatically adjust to the optimal operating state when turning, and the fixed block can automatically adjust with the rotation angle when turning the traveling sorting device, and the second pressure sensor arranged on the support plate can monitor the position of the object placed on the upper end surface of the traveling sorting device, so as to solve the problem that the frame of the traveling sorting device is deformed by the track change when turning, and the position of the object on the surface of the traveling sorting device cannot be monitored.

[0021] The present application provides a rotatable guide wheel at one end of the swing arm, and movably mounts one end of the swing arm on one end of the adaptive device through a limit rod, and then respectively mounts the two ends of the tension spring on the fixed rod at the center of the swing arm, so that the tension spring drives the swing arm to move relative to each other through the fixed rod, thereby achieving the mutual cooperation of the swing arm, the guide wheel and the tension spring to automatically adjust to the optimal movement state, thereby solving the problem that the walking sorting device is easily locked and cannot work when the frame turns.

[0022] The present application fixes the rotating device at both ends of the bottom of the frame, vertically arranges a metal sleeve on the lower end surface of the rotating device, and rotatably installs the fixing block inside the bottom end of the metal sleeve through the mounting column, so that when the walking sorting device turns, the mounting column can rotate and adjust itself according to the bending angle, thereby solving the problem of frame deformation when the walking sorting device turns.

[0023] The present application fixes a first pressure sensor at the center of the inside of a walking and sorting device, and installs a support plate on the top of the first pressure sensor, so that the first pressure sensor and the support plate cooperate to weigh the object, and sets a plurality of second pressure sensors for monitoring the position of the object on the support plate, so that the second pressure sensors monitor the position of the object and transmit the monitoring data to the intelligent controller. When the second pressure sensor detects that the object is close to the edge of the walking and sorting device, the intelligent controller starts the rotating drive component, so that the rotating drive component drives the conveyor belt to move and adjust the position of the object through the active pulley, the transmission belt, the driven pulley and the roller shaft, thereby realizing the monitoring and adjustment of the object position and solving the problem that the object is at the edge of the surface of the walking and sorting device and is prone to falling when moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereoscopic diagram of a sorting trolley of a curved cross-belt sorter.

[0025] Figure 2 It is an exploded view of the base of a sorting trolley of a curved cross-belt sorter.

[0026] Figure 3 This is a three-dimensional structure diagram of the walking sorting device in the sorting trolley of the curved cross belt sorter Figure 1 .

[0027] Figure 4 This is a three-dimensional structure diagram of the walking sorting device in the sorting trolley of the curved cross belt sorter Figure 1 .

[0028] Figure 5 It is an exploded view of a walking sorting device in a sorting trolley of a curved cross-belt sorter.

[0029] Figure 6 The present invention is a schematic diagram of the internal structure of a walking sorting device in a sorting trolley of a curved cross-belt sorter.

[0030] Figure 7 The present invention is a stereoscopic diagram of a frame of a sorting trolley of a curved cross-belt sorter.

[0031] Figure 8 The present invention is a three-dimensional diagram of a support plate in a sorting trolley of a curved cross-belt sorter.

[0032] Fig. 9 It is a three-dimensional diagram of an adaptive device in a sorting trolley of a curved cross-belt sorter.

[0033] Fig.10 It is a stereoscopic diagram of a rotating device in a sorting trolley of a curved cross-belt sorter.

[0034] The numbers in the figure are: 1. base; 101. mounting groove; 102. directional transmission belt; 103. limiting groove; 2. cross loading platform; 3. unloading platform; 4. walking sorting device; 401. intelligent controller; 402. first pressure sensor; 403. support plate; 4031. second pressure sensor; 404. roller; 4041. driven pulley; 405. rotating drive member; 4051. driving pulley; 4052. transmission belt; 406. conveyor belt; 5. frame; 501. first fixed frame; 502. second fixed frame; 6. adaptive device; 601. limiting rod; 602. swing arm; 603. guide wheel; 604. fixing rod; 605. tension spring; 7. rotating device; 701. metal sleeve; 702. mounting column; 703. fixing block. DETAILED DESCRIPTION

[0035] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] See also Figures 1 to 10 As shown, a sorting trolley of a curved cross-belt sorting machine comprises a base 1, a plurality of movably connected walking sorting devices 4 are arranged on the top of the base 1, and the walking sorting devices 4 can move horizontally along the top of the base 1, a frame 5 is arranged on the bottom of the walking sorting device 4, and a plurality of adaptive devices 6 are symmetrically arranged on both sides of the frame 5, two groups of rotatable guide wheels 603 are movably arranged on one end of the adaptive device 6, and a rotating device 7 is symmetrically arranged on the bottom of the frame 5, and a rotatable fixed block 703 is arranged on the bottom of the rotating device 7, and a supporting plate 403 for weighing is arranged on the top of the walking sorting device 4, and a plurality of second pressure sensors 4031 for sensing the position of the object are arranged and distributed on the supporting plate 403.

[0037] When in use, by symmetrically arranging a plurality of adaptive devices 6 on both sides of the frame 5, and movably arranging two groups of guide wheels 603 that can move relative to each other at one end of the adaptive device 6, the guide wheels 603 can move along the inside of the limiting groove 103, by rotatably arranging a fixed block 703 at the bottom of the rotating device 7, and fixing the fixed block 703 on the upper end surface of the directional transmission belt 102, when the fixed block 703 moves with the directional transmission belt 102, the fixed block 703 drives the walking and sorting device 4 to move through the rotating device 7 and the frame 5, by arranging a support plate 403 on the top of the walking and sorting device 4, and dividing a plurality of second pressure sensors 4031 on the support plate 403 for sensing objects, the guide wheels 603 of the walking and sorting device 4 can automatically adjust to the optimal operating state when turning, and the fixed block 703 can automatically adjust with the rotation angle when turning, so as to avoid deformation of the frame 5 due to changes in the moving angle, and the position of the object on the surface of the walking and sorting device 4 can be monitored through the second pressure sensor 4031.

[0038] See also Figure 4 , Figure 7 and Fig. 9 As shown, a swing arm 602 is movably provided at the center of the guide wheel 603 , and one end of the swing arm 602 is movably installed inside one end of the adaptive device 6 .

[0039] When in use, one end of the two sets of swing arms 602 is movably installed inside one end of the adaptive device 6, so that the swing arms 602 drive the guide wheels 603 to swing horizontally.

[0040] See also Fig. 9 As shown, a tension spring 605 is movably installed at the center of the swing arm 602 , and a fixing rod 604 for installing the tension spring 605 is provided inside the center of the swing arm 602 .

[0041] When in use, a fixing rod 604 is arranged at the center of the swing arm 602, and two ends of the tension spring 605 are respectively installed outside the fixing rod 604, so that the tension spring 605 drives the swing arm 602 to move relative to each other.

[0042] See also Fig. 9 As shown, two groups of limiting rods 601 for installing the swing arm 602 are symmetrically arranged inside one end of the adaptive device 6.

[0043] When in use, two groups of limiting rods 601 are symmetrically arranged on the inner side of one end of the adaptive device 6 , and the swing arm 602 is rotatably installed on the outside of the limiting rod 601 , so that the swing arm 602 rotates along the outside of the limiting rod 601 .

[0044] See also Figure 4 , Figure 7 and Fig.10As shown, a mounting column 702 is disposed on the upper end surface of the fixed block 703 , and a metal sleeve 701 for movably mounting the mounting column 702 is vertically disposed on the lower end surface of the rotating device 7 .

[0045] When in use, a metal sleeve 701 is set on the lower end surface of the rotating device 7, and a mounting column 702 is vertically set on the upper end surface of the fixed block 703, and then the mounting column 702 is rotated and installed inside the metal sleeve 701, so that the fixed block 703 can be rotated along the inside of the metal sleeve 701 through the mounting column 702 to adjust the angle.

[0046] See also Figure 5 , Figure 6 ,and Figure 8 As shown, a first pressure sensor 402 is provided at the bottom of the support plate 403 , and the first pressure sensor 402 is fixed at the center of the walking and sorting device 4 .

[0047] When in use, the first pressure sensor 402 is fixed at the center of the walking and sorting device 4, and the support plate 403 is fixed on the top of the first pressure sensor 402, so that the first pressure sensor 402 and the support plate 403 cooperate with each other to weigh the object.

[0048] See also Figure 3 , Figure 4 and Figure 5 As shown, rollers 404 are rotatably provided at both ends of the walking sorting device 4, and a driven pulley 4041 for transmission is provided at one end of the roller 404, and a conveyor belt 406 for driving the object to move is installed outside the roller 404.

[0049] When in use, rollers 404 are symmetrically arranged at both ends of the walking and sorting device 4, and the conveyor belt 406 is installed outside the rollers 404, so that the rollers 404 drive the conveyor belt 406 to move.

[0050] See also Figure 5 and Figure 6 As shown, a rotating driving member 405 is provided inside one side of the walking and sorting device 4, and an intelligent controller 401 capable of controlling the operation of the rotating driving member 405 is provided inside the walking and sorting device 4, and the intelligent controller 401 is electrically connected to the first pressure sensor 402 and the second pressure sensor 4031 respectively.

[0051] When in use, an intelligent controller 401 electrically connected to the first pressure sensor 402, the second pressure sensor 4031 and the rotating drive member 405 is arranged inside the walking sorting device 4, so that the first pressure sensor 402 and the second pressure sensor 4031 monitor the weight and position of the object, and transmit the monitoring data to the intelligent controller 401, so that the intelligent controller 401 controls the rotating drive member 405 to start or shut down.

[0052] See also Figure 5 and Figure 6 As shown, a driving pulley 4051 is provided at the output end of the rotary driving member 405 , and a transmission belt 4052 for transmission is provided outside the driving pulley 4051 .

[0053] When in use, a driving pulley 4051 is set at the output end of the driving pulley 4051, and then the transmission belt 4052 and the driven pulley 4041 are connected through the transmission belt 4052, so that when the rotating driving member 405 drives the driving pulley 4051 to rotate, the roller 404 is driven to rotate through the transmission belt 4052 and the driven pulley 4041.

[0054] See also Figure 5 and Figure 6 As shown, a first fixing frame 501 is provided at one end of the frame 5 , and a second fixing frame 502 is provided at the other end of the frame 5 , and both sides of the walking sorting device 4 are fixed to the top of the first fixing frame 501 and the second fixing frame 502 .

[0055] When in use, the first fixing frame 501 and the second fixing frame 502 are respectively provided at both ends of the frame 5, and the first fixing frame 501 and the second fixing frame 502 are respectively fixed to the centers of both sides of the walking sorting device 4, so that the frame 5 supports the walking sorting device 4 through the first fixing frame 501 and the second fixing frame 502.

[0056] See also Figure 1 and Figure 2 As shown, a mounting groove 101 is horizontally arranged at the center of the inner side of the base 1 , and a directional transmission belt 102 for fixing the fixing block 703 is movably arranged inside the mounting groove 101 .

[0057] When in use, by setting the installation groove 101 at the center of the inner side of the base 1, the directional transmission belt 102 moves along the inside of the installation groove 101, and by fixing the fixed block 703 to the upper end surface of the directional transmission belt 102, the directional transmission belt 102 drives the fixed block 703 to move.

[0058] See also Figure 1 and Figure 2As shown, the inner side of the top of the base 1 is symmetrically provided with a limiting groove 103 for the movement of the guide wheel 603.

[0059] When in use, the limiting grooves 103 are symmetrically arranged on the inner side of the top of the base 1 so that the guide wheel 603 can move along the inside of the limiting grooves 103 .

[0060] See also Figure 1 As shown, a cross loading platform 2 for conveying articles to a walking sorting device 4 is provided on one side of the base 1, and a plurality of unloading platforms 3 for guiding articles out are staggeredly provided on the outside of the other side of the base 1.

[0061] When in use, a cross loading platform 2 is arranged on one side of the base 1, so that the cross loading platform 2 transports the objects to the upper end surface of the walking sorting device 4, and an unloading platform 3 is arranged on the outside of the other side of the base 1, so that the walking sorting device 4 can output the objects through the unloading platform 3 according to their weight, thereby achieving the purpose of automatic sorting.

[0062] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A sorting trolley for a curved cross belt sorting machine, comprising a base (1), characterized in that: A mounting groove (101) is horizontally arranged at the center of the inner side of the base (1), a directional conveyor belt (102) is arranged inside the mounting groove (101), a limiting groove (103) is symmetrically arranged on the inner side of the top of the base (1), a plurality of movably connected walking and sorting devices (4) are arranged on the top of the base (1), and the walking and sorting devices (4) can move horizontally along the top of the base (1), a frame (5) is arranged at the bottom of the walking and sorting devices (4), and a plurality of adaptive devices (6) are symmetrically arranged on both sides of the frame (5), two groups of rotatable guide wheels (603) are movably arranged at one end of the adaptive device (6), and the guide wheels (603) can move along the inside of the limiting groove (103), and a rotating device (7) is symmetrically arranged at the bottom of the frame (5), and the bottom of the rotating device (7) A rotatable fixed block (703) is provided at the top of the walking and sorting device (4), a support plate (403) for weighing is provided at the top of the walking and sorting device (4), a plurality of second pressure sensors (4031) for sensing the position of an object are provided on the support plate (403), rollers (404) are rotatably provided at both ends of the walking and sorting device (4), a driven pulley (4041) for transmission is provided at one end of the roller (404), and a conveyor belt (406) for driving the object to move is installed outside the roller (404), the fixed block (703) is fixed to the upper end surface of the directional conveyor belt (102), so that when the fixed block (703) moves with the directional conveyor belt (102), the fixed block (703) drives the walking and sorting device (4) to move through the rotating device (7) and the frame (5); A swing arm (602) is movably provided at the center of the guide wheel (603), and one end of the swing arm (602) is movably mounted inside one end of the adaptive device (6); A tension spring (605) is movably installed at the center of the swing arm (602), and a fixing rod (604) for installing the tension spring (605) is provided inside the center of the swing arm (602), and both ends of the tension spring (605) are respectively installed outside the fixing rod (604), so that the tension spring (605) drives the swing arm (602) to move relative to each other; Two groups of limit rods (601) for mounting the swing arm (602) are symmetrically arranged inside one end of the self-adaptive device (6), and the swing arm (602) is rotatably mounted outside the limit rod (601), so that the swing arm (602) rotates along the outside of the limit rod (601); The upper end surface of the fixed block (703) is provided with a mounting column (702), and the lower end surface of the rotating device (7) is vertically provided with a metal sleeve (701) for movably mounting the mounting column (702).

2. A sorting trolley for a curved cross belt sorting machine according to claim 1, characterized in that: A first pressure sensor (402) is provided at the bottom of the support plate (403), and the first pressure sensor (402) is fixed at the center of the walking and sorting device (4).

3. A sorting trolley for a curved cross belt sorting machine according to claim 1, characterized in that: A rotating drive member (405) is disposed inside one side of the walking and sorting device (4), and an intelligent controller (401) capable of controlling the operation of the rotating drive member (405) is disposed inside the walking and sorting device (4), and the intelligent controller (401) is electrically connected to the first pressure sensor (402) and the second pressure sensor (4031), respectively.

4. A sorting trolley for a curved cross belt sorting machine according to claim 3, characterized in that: The output end of the rotating drive member (405) is provided with a driving pulley (4051), and the outside of the driving pulley (4051) is provided with a transmission belt (4052) for transmission.

5. The sorting trolley of the curved cross belt sorting machine according to claim 1, characterized in that: A first fixing frame (501) is provided at one end of the vehicle frame (5), and a second fixing frame (502) is provided at the other end of the vehicle frame (5), and two sides of the walking sorting device (4) are fixed to the top of the first fixing frame (501) and the second fixing frame (502).

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