Single-electric-drive transmission mechanism and duct piece conveying trolley

Abstract

Compared with the prior art, the transmission mechanism driven by the single motor disclosed by the utility model comprises a transmission rack arranged on a fixed frame; the double-shaft motor is arranged on the moving frame, motor gears are arranged at the two ends of the double-shaft motor, and the motor gears are in meshed connection with the transmission racks; the one-way meshing mechanism is arranged on the moving frame, and the input end of the one-way meshing mechanism is in transmission connection with a motor gear; the rack driving mechanism is arranged on the fixed frame in a sliding manner; the roller mechanism is arranged on the lifting platform; the roller mechanism is used for driving the lifting platform to ascend and descend; the output end of the one-way meshing mechanism is used for controlling the rack driving mechanism to move relative to the roller mechanism. Compared with the prior art, the transmission mechanism driven by the single electricity can reduce the manufacturing cost of the duct piece conveying trolley, improve the duct piece conveying efficiency, reduce the operation loss and reduce the maintenance cost. In addition, the utility model further provides a duct piece conveying trolley which has the same effects.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machine segment transportation, and more specifically, to a single-electrically driven transmission mechanism and a segment transportation trolley. Background Art

[0002] The operating environment of the shield machine is an underground cylindrical pipe cavity with a fixed diameter. The pipe segments are grabbed from the outside of the cylindrical pipe and placed into the cylindrical pipe cavity by a crane. Due to the space constraints of other functional components of the shield machine, the crane cannot directly reach the position of the pipe segment assembly machine, and a pipe segment conveying trolley is required for transportation. At present, the pipe segment conveying trolley mainly transports the pipe segments through telescopic cylinders and lifting cylinders.

[0003] Currently, a typical segment transport trolley in construction projects consists of at least four lifting cylinders and one telescopic cylinder. Cylinder costs account for a significant portion of the trolley's manufacturing cost and present a significant risk of leakage. Due to the high concentration of mud and water in the underground environment, sand can be trapped during the cylinder's extension and retraction process, causing wear on the rod diameter and increasing subsequent maintenance costs.

[0004] Therefore, how to provide a single electric drive transmission mechanism that can reduce the manufacturing cost of the pipe segment conveying trolley, improve the pipe segment conveying efficiency, reduce operating losses, and reduce maintenance costs has become a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a single electric drive transmission mechanism, which can reduce the manufacturing cost of the pipe segment conveying trolley, improve the pipe segment conveying efficiency, reduce operating losses, and reduce maintenance costs.

[0006] The technical solutions provided by this utility model are as follows:

[0007] The utility model provides a single-electric drive transmission mechanism, which, compared with the prior art, includes: a transmission rack arranged on a fixed frame; a double-axis motor arranged on a movable frame, motor gears being arranged at both ends of the double-axis motor, and the motor gears being meshed and connected with the transmission rack; a one-way meshing mechanism arranged on the movable frame, and the input end of the one-way meshing mechanism being transmission-connected with the motor gear; a rack drive mechanism slidably arranged on the fixed frame; a roller mechanism arranged on a lifting platform; the roller mechanism and the inclined slideway of the rack drive mechanism slide relative to each other, driving the lifting platform to be lifted and lowered; the output end of the one-way meshing mechanism is used to control the relative movement of the rack drive mechanism relative to the roller mechanism.

[0008] Furthermore, in a preferred embodiment of the present invention, the one-way meshing mechanism includes: a first transmission group connected to the motor gear as an input end; a synchronous belt connected to the first transmission group; and a second transmission group connected to the first transmission group through the synchronous belt as an output end.

[0009] Furthermore, in a preferred embodiment of the present invention, the first transmission group includes: a first transmission body; a first transmission shaft arranged on the first transmission body; an inner transmission gear arranged at one end of the first transmission shaft; a first ratchet mechanism arranged on the first transmission shaft; a first outer transmission gear tooth arranged on the first transmission shaft; the second transmission group includes: a second transmission body; a second transmission shaft arranged on the second transmission body; a second ratchet mechanism arranged on the second transmission shaft; a second outer transmission gear tooth arranged on the second transmission shaft, and the second outer transmission gear tooth and the first outer transmission gear tooth are transmission-connected via the synchronous belt.

[0010] Furthermore, the first ratchet mechanism includes: a first ratchet tooth provided on the first transmission shaft; a first ratchet pawl provided on the inner side of the first transmission body; a first half-tooth column provided on the outer side of the first transmission body; the second ratchet mechanism includes: a second ratchet tooth provided on the second transmission shaft; a second ratchet pawl provided on the inner side of the second transmission body; and a second half-tooth column provided on the outer side of the second transmission body.

[0011] Furthermore, in a preferred embodiment of the present invention, the meshing direction of the second ratchet teeth is opposite to the meshing direction of the first ratchet teeth.

[0012] Furthermore, the rack drive mechanism includes: a driving rack body; a first tooth portion provided on the driving rack body and engaged with the first half-tooth column; a second tooth portion provided on the driving rack body and engaged with the second half-tooth column; and an inclined slide provided on the driving rack body.

[0013] Furthermore, the inclined slide includes: an inclined slide body provided on the driving rack body; and a groove structure provided on the upper surface of the inclined slide body and integrally formed with the inclined slide body.

[0014] The utility model also provides a pipe segment conveying trolley, comprising: a movable frame; a single-electrically driven transmission mechanism arranged on the movable frame; a fixed frame arranged on the movable frame; and a lifting platform connected to the single-electrically driven transmission mechanism.

[0015] Furthermore, the mobile frame includes: a mobile frame body; and mobile wheels provided at the lower part of the mobile frame body.

[0016] Furthermore, the fixing frame includes: a fixing frame body provided on the movable frame; and a fixing frame baffle formed integrally with the fixing frame body and vertically provided on the outer side of the fixing frame body.

[0017] The utility model provides a single-electric drive transmission mechanism, which, compared with the prior art, includes: a transmission rack for being arranged on a fixed frame; a double-axis motor for being arranged on a movable frame, motor gears being arranged at both ends of the double-axis motor, and the motor gears being meshed and connected with the transmission rack; a one-way meshing mechanism for being arranged on the movable frame, the input end of the one-way meshing mechanism being transmission-connected with the motor gear; a rack drive mechanism for being slidably arranged on the fixed frame; a roller mechanism for being arranged on a lifting platform; the roller mechanism and the inclined slideway of the rack drive mechanism slide relative to each other, driving the lifting platform to be lifted and lowered; the output end of the one-way meshing mechanism is used to control the relative movement of the rack drive mechanism relative to the roller mechanism. When the single-electric drive transmission mechanism is in operation, it drives the dual-axis motor to rotate the motor gear. Since the motor gear is connected to a one-way meshing mechanism, which is connected to a rack drive mechanism, the rotation of the motor gear drives the rack drive mechanism through the one-way meshing mechanism. The roller mechanism disposed on the lifting platform slides relative to the inclined slideway of the rack drive mechanism, driving the lifting platform to lift and lower, thereby transporting the pipe segments. Compared with the prior art, the transport efficiency of the pipe segment trolley is significantly improved. The utility model also provides a pipe segment transport trolley, comprising: a mobile frame; a single-electric drive transmission mechanism disposed on the mobile frame; a fixed frame disposed outside the single-electric drive transmission mechanism; and a lifting platform connected to the single-electric drive transmission mechanism. The mobile frame is used to move the pipe segment transport trolley, the fixed frame secures the overall structure of the pipe segment transport trolley, the single-electric drive transmission mechanism is disposed within the mobile frame and the fixed frame, and is connected to the lifting platform for driving the lifting platform. When the dual-axis motor in the single-electric drive transmission mechanism is activated, it drives the lifting platform to transport the pipe segments. The pipe segment conveying trolley involved in the utility model does not need the original multiple oil cylinders and supporting hydraulic pipeline components, which reduces the cost of production and maintenance. The single electric drive transmission mechanism is arranged inside the mobile frame and the fixed frame, saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a segment conveying trolley provided in an embodiment of the present utility model;

[0020] Figure 2 A schematic diagram of a dual-axis motor and connected structure of a single electric drive transmission mechanism provided in an embodiment of the present utility model;

[0021] Figure 3 A schematic diagram of a one-way engagement mechanism of a single electric drive transmission mechanism provided in an embodiment of the present utility model;

[0022] Figure 4 A schematic diagram showing the connection between the one-way meshing mechanism of the single-electric drive transmission mechanism and the rack drive mechanism provided in an embodiment of the present utility model;

[0023] Figure 5 Schematic diagram of a rack drive mechanism of a single electric drive transmission mechanism provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "first", "second", "vertical", "horizontal", "top", "bottom" and "vertical" are used interchangeably.

[0027] The directions or positional relationships indicated by “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0028] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, the elements defined by a statement do not preclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the elements.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0030] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by people familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in this utility model without affecting the efficacy and objectives that can be achieved by the present utility model.

[0031] Please Figures 1 to 5 As shown, the single-electric drive transmission mechanism provided by the embodiment of the present invention includes: a transmission rack 4 arranged on a fixed frame 5; a dual-axis motor 1 arranged on a movable frame 3, and motor gears 2 are arranged at both ends of the dual-axis motor 1, and the motor gear 2 is meshed and connected with the transmission rack 4; a one-way meshing mechanism 6 arranged on the movable frame 3, and the input end of the one-way meshing mechanism 6 is transmission-connected with the motor gear 2; a rack drive mechanism 8 slidingly arranged on the fixed frame 5; a roller mechanism 804 arranged on the lifting platform 7; the roller mechanism 804 slides relative to the inclined slide 805 of the rack drive mechanism 8, driving the lifting platform 7 to lift and lower; the output end of the one-way meshing mechanism 6 is used to control the relative movement of the rack drive mechanism 8 relative to the roller mechanism 804.

[0032] Among them, when the single-electric drive transmission mechanism is working, it drives the dual-axis motor to drive the motor gear to rotate. Since the motor gear is connected to the one-way meshing mechanism, and the one-way meshing mechanism is connected to the rack drive mechanism, the rotation of the motor gear drives the rack drive mechanism through the one-way meshing mechanism. The roller mechanism arranged on the lifting platform slides relative to the inclined slide of the rack drive mechanism, driving the lifting platform to lift and lower, thereby realizing the transportation of the pipe segments and greatly improving the transportation efficiency of the pipe segment trolley.

[0033] As a result, multiple oil cylinders and supporting hydraulic pipeline components in the traditional structure are optimized, reducing component manufacturing costs and subsequent maintenance costs.

[0034] Specifically, the one-way meshing mechanism 6 includes: a first transmission group connected to the motor gear as an input end; a synchronous belt 601 connected to the first transmission group; and a second transmission group connected to the first transmission group through the synchronous belt 601 as an output end.

[0035] It should be noted that, in the embodiment of the present invention, the synchronous belt 601 is not the only implementation scheme, and any component with a transmission function can be used instead, such as a chain transmission solution.

[0036] Specifically, in an embodiment of the present utility model, the first transmission group includes: a first transmission body 604; a first transmission shaft 603 arranged on the first transmission body 604; an inner transmission gear 602 arranged at one end of the first transmission shaft 603; a first ratchet mechanism arranged on the first transmission shaft 603; a first outer transmission gear tooth 605 arranged on the first transmission shaft 603; the second transmission group includes: a second transmission body 610; a second transmission shaft 609 arranged on the second transmission body 610; a second ratchet mechanism arranged on the second transmission shaft 609; a second outer transmission gear tooth 611 arranged on the second transmission shaft 609, and the second outer transmission gear tooth 611 is connected to the first outer transmission gear tooth 605 through the synchronous belt 601.

[0037] Specifically, in an embodiment of the present utility model, the first ratchet mechanism includes: a first ratchet tooth 606 provided on the first transmission shaft 603; a first ratchet pawl 607 provided on the inner side of the first transmission body 604; a first half-tooth column 608 provided on the outer side of the first transmission body 604; the second ratchet mechanism includes: a second ratchet tooth 612 provided on the second transmission shaft 609; a second ratchet pawl 613 provided on the inner side of the second transmission body 610; and a second half-tooth column 614 provided on the outer side of the second transmission body 610.

[0038] It should be noted that when the mobile frame 3 moves away from the shield body, the inner transmission gear 602 drives the first half-tooth column 608 of the first ratchet mechanism to rotate, driving the rack drive mechanism 8 to move toward the shield body, and the roller mechanism provided on the lifting platform 7 slides relative to the inclined slide of the rack drive mechanism 8, and the lifting platform 7 rises; when the mobile frame 3 moves toward the shield body, the inner transmission gear 602 drives the second half-tooth column 614 of the second ratchet mechanism to rotate, driving the rack drive mechanism 8 to move toward the shield body, and the roller mechanism provided on the lifting platform 7 slides relative to the inclined slide of the rack drive mechanism 8, and the lifting platform 7 falls.

[0039] Specifically, in the embodiment of the present invention, the meshing direction of the second ratchet teeth 612 is opposite to the meshing direction of the first ratchet teeth 606 .

[0040] Therefore, when the lifting platform 7 needs to be raised, the inner transmission gear 602 drives the first half-tooth column 608 of the first ratchet mechanism to rotate; when the lifting platform 7 needs to be lowered, the inner transmission gear 602 drives the second half-tooth column 614 of the second ratchet mechanism to rotate.

[0041] Specifically, in an embodiment of the present utility model, the rack drive mechanism 8 includes: a driving rack body 801; a first tooth portion 802 provided on the driving rack body 801 and engaged with the first half-tooth column 608; a second tooth portion 803 provided on the driving rack body 801 and engaged with the second half-tooth column 614; and an inclined slide 805 provided on the driving rack body 801.

[0042] When the dual-axis motor 1 is started, it sequentially drives the motor gear, the one-way meshing mechanism, and the rack drive mechanism to rotate. If the dual-axis motor 1 rotates forward, driving the rack drive mechanism to slide, the inclined slide 805 approaches the roller mechanism 804, and the roller mechanism 804 rises along with the inclined slide 805, achieving the lifting action of the lifting platform 7. If the dual-axis motor 1 rotates reversely, driving the rack drive mechanism to slide, the inclined slide 805 moves away from the roller mechanism 804, and the roller mechanism 804 descends along with the inclined slide 805, achieving the lowering action of the lifting platform 7.

[0043] Specifically, in the embodiment of the present utility model, the inclined slide 805 includes: an inclined slide 805 body provided on the driving rack body 801; and a groove structure provided on the upper surface of the inclined slide 805 body and integrally formed with the inclined slide 805 body.

[0044] It should be noted that if the dual-axis motor 1 rotates forward and drives the rack drive mechanism to slide, the inclined slide 805 approaches the roller mechanism 804, and the roller mechanism 804 is lifted along with the inclined slide 805. After being lifted to a certain height, it falls into the groove structure on the upper surface of the inclined slide 805 main body, thereby fixing the lifting action of the lifting platform 7; if the dual-axis motor 1 reverses and drives the rack drive mechanism to slide, the inclined slide 805 moves away from the roller mechanism 804, and the roller mechanism 804 slides out of the groove structure on the upper surface of the inclined slide 805 main body, thereby realizing the landing action of the lifting platform 7.

[0045] The utility model also provides a segment conveying trolley, comprising: a movable frame 3; a single-electrically driven transmission mechanism provided on the movable frame 3; a fixed frame 5 provided on the movable frame 3; and a lifting platform 7 connected to the single-electrically driven transmission mechanism.

[0046] The movable frame 3 is used to move the segment conveying trolley, while the fixed frame 5 secures the entire structure of the segment conveying trolley. A single-electric drive transmission mechanism is located within the movable frame 3 and the fixed frame 5, connected to the lifting platform 7 to drive the lifting platform 7. Upon activation, the dual-axis motor 1 in the single-electric drive transmission mechanism drives the lifting platform 7 to transport the segments. The segment conveying trolley provided by this utility model eliminates the need for multiple oil cylinders and associated hydraulic piping components, reducing manufacturing and maintenance costs. The placement of the single-electric drive transmission mechanism within the movable frame 3 and the fixed frame 5 significantly saves space.

[0047] Specifically, in the embodiment of the present utility model, the mobile frame 3 includes: a mobile frame body; and mobile wheels provided at the lower part of the mobile frame body.

[0048] Specifically, in the embodiment of the present invention, the fixing frame 5 includes: a fixing frame body provided on the moving frame 3; and a fixing frame baffle formed integrally with the fixing frame body and vertically provided on the outside of the fixing frame body.

[0049] Therefore, when the dual-axis motor 1 rotates forward and drives the rack drive mechanism to slide, the inclined slide 805 approaches the roller mechanism 804, and the roller mechanism 804 is lifted along with the inclined slide 805. Since the lifting platform 7 is connected to the roller mechanism 804, as the roller mechanism 804 is lifted, the lifting platform 7 will also rise, and finally the lifting action of the lifting platform 7 is realized; if the motor is reversed and drives the rack drive mechanism to slide, the inclined slide 805 moves away from the roller mechanism 804, and the roller mechanism 804 descends along with the inclined slide 805. Since the lifting platform 7 is connected to the roller mechanism 804, as the roller mechanism 804 descends, the lifting platform 7 will also descend, and the descending action of the lifting platform 7 is realized.

[0050] To elaborate more specifically, the single-electric drive transmission mechanism involved in the present invention can greatly improve the efficiency of the segment conveying trolley, and the number of segment conveying trolleys involved in the segment conveying workflow is reduced from four to two. In terms of cost, the main components of the single-electric drive transmission mechanism involved in the present invention are a dual-axis motor 1 and related structural parts. Compared with the original multiple oil cylinders and supporting hydraulic pipeline components, the procurement and production costs are lower, achieving cost optimization. In terms of the overall layout of the machine, the single-electric drive transmission mechanism involved in the present invention is mainly arranged inside the mobile frame 3 and the fixed frame 5, which can better utilize the internal space, reduce the interface structure of the hydraulic components, and make the overall layout more compact and simple. Compared with the existing technology, it has significant technical effects.

[0051] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A single electric drive transmission mechanism, characterized in that: include: A transmission rack (4) disposed on a fixed frame (5); A dual-axis motor (1) is arranged on a movable frame (3), wherein motor gears (2) are arranged at both ends of the dual-axis motor (1), and the motor gears (2) are meshedly connected with the transmission rack (4); A one-way meshing mechanism (6) is provided on the movable frame (3), wherein an input end of the one-way meshing mechanism (6) is in transmission connection with the motor gear (2); A rack drive mechanism (8) slidably disposed on the fixed frame (5); A roller mechanism (804) provided on the lifting platform (7); The roller mechanism (804) slides relative to the inclined slideway (805) of the rack drive mechanism (8), driving the lifting platform (7) to rise and fall; The output end of the one-way meshing mechanism (6) is used to control the relative movement of the rack drive mechanism (8) relative to the roller mechanism (804).

2. The single electric drive transmission mechanism according to claim 1, characterized in that: The one-way meshing mechanism (6) comprises: A first transmission group connected to the motor gear as an input end; a synchronous belt (601) connected to the first transmission group; The second transmission group is connected to the first transmission group via the synchronous belt (601) and serves as the output end.

3. The single electric drive transmission mechanism according to claim 2, characterized in that: The first transmission group includes: A first transmission body (604); a first transmission shaft (603) provided on the first transmission body (604); an inner transmission gear (602) provided at one end of the first transmission shaft (603); a first ratchet mechanism provided on the first transmission shaft (603); First outer transmission gear teeth (605) provided on the first transmission shaft (603); The second transmission group includes: A second transmission body (610); a second transmission shaft (609) provided on the second transmission body (610); a second ratchet mechanism provided on the second transmission shaft (609); A second outer transmission gear tooth (611) is provided on the second transmission shaft (609), and the second outer transmission gear tooth (611) is transmission-connected to the first outer transmission gear tooth (605) via the synchronous belt (601).

4. The single electric drive transmission mechanism according to claim 3, characterized in that: The first ratchet mechanism comprises: First ratchet teeth (606) provided on the first transmission shaft (603); a first ratchet pawl (607) provided on the inner side of the first transmission body (604); A first half-side tooth column (608) provided on the outside of the first transmission body (604); The second ratchet mechanism comprises: Second ratchet teeth (612) provided on the second transmission shaft (609); a second ratchet pawl (613) provided on the inner side of the second transmission body (610); A second half-side tooth column (614) is provided on the outside of the second transmission body (610).

5. The single electric drive transmission mechanism according to claim 4, characterized in that: The meshing direction of the second ratchet teeth (612) is opposite to the meshing direction of the first ratchet teeth (606).

6. The single electric drive transmission mechanism according to claim 4, characterized in that: The rack drive mechanism (8) comprises: Drive rack body (801); a first tooth portion (802) provided on the driving rack body and meshing with the first half-side tooth column (608); a second tooth portion (803) provided on the driving rack body and meshing with the second half-side tooth column (614); An inclined slideway (805) is provided on the driving rack body.

7. The single electric drive transmission mechanism according to claim 6, characterized in that: The inclined slide (805) comprises: an inclined slideway body provided on the driving rack body; A groove structure is provided on the upper surface of the inclined slide main body and is integrally formed with the inclined slide main body.

8. A segment conveying trolley, characterized in that: include: The single electric drive transmission mechanism according to any one of claims 1 to 7; Mobile rack (3); The single electric drive transmission mechanism is arranged on the mobile frame (3); A fixed frame (5) provided on the movable frame (3); A lifting platform (7) connected to the single electric drive transmission mechanism.

9. The segment conveying trolley according to claim 8, characterized in that: The mobile frame (3) comprises: Mobile frame body; A moving wheel is provided at the lower part of the moving frame body.

10. The segment conveying trolley according to claim 8, characterized in that: The fixing frame (5) comprises: A fixed frame body provided on the movable frame (3); A fixing frame baffle is integrally formed with the fixing frame body and vertically arranged on the outside of the fixing frame body.

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