CN208559777U - A kind of unmanned plane carry rotation table device - Google Patents

Abstract

The utility model provides a kind of unmanned plane carry rotation table device, including the first frame and the second frame being mounted below unmanned aerial vehicle body, loading plate is equipped between first frame and the second frame, the loading plate is used for carry load；It is rotatablely connected between the loading plate and the first frame and the second frame；First frame is equipped with pitch angle regulating device, and the pitch angle regulating device is used to adjust the pitch angle of loading plate.The connector that the design scheme of unmanned plane carry rotation table device described in the utility model uses is less, and connection is reliable, can effectively utilize ventral space, reduces turntable weight and reduce vibration bring bolt falling；Equipped with pitch angle regulating device, the pitch angle of loading plate can be effectively adjusted.

Description

A kind of unmanned plane carry rotation table device

Technical field

The utility model belongs to air vehicle technique field, more particularly, to a kind of unmanned plane carry rotation table device.

Background technique

Unmanned plane load operation technique developed rapidly in recent years, came for work belts such as patrol, safety check, fire-fighting, mapping, monitoring Many convenience, have accumulated certain Technical Reference also for subsequent work.Unmanned plane carry operation has with respect to manual work The advantages that period is short, and personnel are relatively smaller, securely and reliably, can hover, anywhere landing can carry visible light sensor, infrared The monitoring devices such as imager and camera.

Unmanned plane carry flight load needs to consider the working space of load, the connection of load and body, the debugging of load The problems such as range, the convenience of load installation, the safety of hanging structure.Therefore a kind of novel unmanned plane carry turntable dress is designed It sets, meets servo debugging carry function, the practical usability for improving airborne load is of great significance.

Currently, the Setup Type of unmanned aerial vehicle onboard rotation load mainly has gondola and two kinds of holder, gondola is mostly closed, Waterproof rain-proof, there are outsides to install interface, can install interface with helicopter and dock.Gondola is mostly two axle construction, i.e. pitching and side Position rotation, generally all non-360-degree rotates both direction.Holder be it is open, load assembly outer cover be installed on holder again, cloud Platform is divided into two axis and three axis, and each direction of rotation can accomplish 360 ° of rotations.Load size that gondola and holder carry and again Measure relatively small, mostly big boundary and zero relatively fewer for the current on the market product of holder and gondola for carrying big load Spend the product of intelligence control.

Effective carry space of current existing unmanned plane carry rotation table device and effective carry quality are all relatively small, no It is able to satisfy the carry servo rotation operation flight of the big quality load of large volume, is unfavorable for high more of the effective carry integrated level of unmanned plane The use of function big load, therefore the useful space and effective servo range of enhancing carry rotation table device are unmanned plane carry technologies One of important development direction, therefore the installation exercise of long cylinder shape load is considered one of the factor of actual use；Unmanned plane Fuselage platform generally contains undercarriage and ventral is highly lower from the ground, and X-axis and Z axis rotational freedom space are even more to be restricted (note: unmanned plane Y-axis be head positive direction), therefore the space for being designed to fully consider fuselage height and rotation of carry turntable is asked Topic；Unmanned plane payload weight is one of important parameter of aircraft, and the payload the big more is conducive to flight operation, therefore turntable fills The problem of setting weight to be solved miniaturization vacates bigger effective weight space for load；During unmanned plane during flying, can exist Biggish vibration, therefore require carry rotation table device that need to have high security and high reliability, and the quick peace in order to realize load Dress, hanging structure allows for guaranteeing fast assembling-disassembling, easy to operate.

Summary of the invention

In view of this, the utility model is directed to a kind of unmanned plane carry rotation table device, to solve existing unmanned plane Carry device carry space it is smaller, the lesser situation of turntable attitude regulation angle.

In order to achieve the above objectives, the technical solution of the utility model is achieved in that

A kind of unmanned plane carry rotation table device, including the stand frame being mounted on unmanned aerial vehicle body, the stand frame includes The first frame and the second frame being mounted below unmanned aerial vehicle body are equipped between first frame and the second frame and load Plate, the loading plate are used for carry load；

It is rotatablely connected between the loading plate and the first frame and the second frame；

First frame is equipped with pitch angle regulating device, and the pitch angle regulating device is for adjusting loading plate Pitch angle.

Further, first frame and the second frame are vertically arranged in parallel；

The upper half of first frame is rectangle, and lower half is up-side down triangle；The pitch angle regulating device packet Elevation servo motor is included, the outside of the first frame is arranged in the elevation servo motor；Elevation servo motor setting is the The lower half side of one frame；The middle position of the close bottom of the lower half of first frame is equipped with pitching axis hole, described Active tilting component is equipped in pitching axis hole；

The elevation servo motor is for driving active tilting component；

The upper half of second frame is rectangle, and lower half is up-side down triangle；The lower half of second frame also is provided with Corresponding pitching axis hole, and it is equipped with driven tilting component.

Further, the active tilting component includes the pitching shaft being arranged in pitching axis hole, the pitching shaft Outside be equipped with a pair of meshing involute cylindrical gear, the elevation servo motor by driving involute cylindrical gear driving Pitching shaft；The medial end of the pitching shaft is equipped with pitching support device；

The driven tilting component includes the pitching shaft being arranged in the pitching axis hole of the second frame, and setting is being bowed Face upward the pitching support device on the inside of shaft.

Further, the two sides of the loading plate respectively open up a bar limit slot, are designed in each bar limit slot Four screw holes, the two sides of the loading plate are bolted in pitching support device；

The side of the elevation servo motor installation position of first frame is additionally provided with banking pin mounting hole, the banking pin peace Dress hole is for installing banking pin, and the banking pin is for the limit to loading plate pitch angle.

Further, the upper half of first frame is set there are three rectangular weight loss groove, and the pitching motor of lower half is installed The side of position sets that there are two special-shaped weight loss grooves；

The upper half of second frame is equipped with three rectangular weight loss grooves identical with first frame；Second side The lower half of frame sets that there are three special-shaped weight loss grooves.

Further, the top of first frame and the second frame is vertically equipped with multiple fuselage upper plate mounting holes, described The top of first frame and the second frame is fixed on fuselage upper plate by fixing bolt；

The middle position of first frame and the second frame laterally opens up a bar shaped sliding slot, and the bar shaped sliding slot is used for The lower plate of insertion installation fuselage；

The bar shaped sliding slot is equipped with multiple boss, and the bar shaped sliding slot runs through boss, and the boss is pacified equipped with lower plate Hole is filled, the boss is bolted in fuselage lower plate.

Further, the stand frame further includes connecting plate, and the connecting plate is arranged on first frame and the second side Between frame, the first frame and the second frame is arranged in close to the end of one end of fuselage in the connecting plate；

The two sides of the connecting plate are equipped with concave station, and the concave station is equipped with connecting hole, first frame and the second frame It is bolted in the concave station of connecting plate, first frame and the second frame are all perpendicular to connecting plate；

It is bolted on the upper plate of fuselage above the connecting plate, lower section is bolted under fuselage On plate.

Further, the connecting plate is rectangular frame, is equipped with three vertical companies in the rectangular frame bracket Muscle is connect, left and right space uniform is arranged in rectangular frame；Three vertical dowels reinforce connection by two braces, and gusset is handed over R3 fillet rounding off is used at remittance.

Further, orientation angles regulating device is additionally provided on the loading plate, the orientation angles regulating device includes Bearing servo motor and orientation assembly；

The orientation assembly includes direction rotating shaft, and the loading plate is equipped with orientation axis hole, and the direction rotating shaft setting exists In orientation axis hole, two angular contact ball bearings are installed on the outside of the upper end of the direction rotating shaft, realize the rotation of azimuth axis about the z axis certainly By spending；

The loading plate is equipped with bearing servo motor installation position, and the bearing servo motor is vertically mounted on loading plate On, the bearing servo motor drives direction rotating shaft rotation by the involute cylindrical gear of driving a pair of meshing.

Further, the orientation axis hole each side opens up a cable hole, and the cable hole is for bottom electricity Air hardening part cabling；

Loading plate weight loss groove is additionally provided on the loading plate.

Compared with the existing technology, unmanned plane carry rotation table device described in the utility model has the advantage that

(1) connector that the design scheme of unmanned plane carry rotation table device described in the utility model uses is less, connection Reliably, ventral space can be effectively utilized, turntable weight is reduced and reduces vibration bring bolt falling； Stand frame uses U-shaped structure, pitching regulating device and position regulating device is equipped with, either to long cylinder load or other load It can realize that wide-angle pitch regulation and level orientation are adjusted.

(2) unmanned plane carry rotation table device described in the utility model is the pitch angle adjusting for realizing carry, and real The adjusting of the level orientation angle of carry is showed, all parts design rationally, takes full advantage of the space of frame and loading plate.

(3) unmanned plane carry rotation table device orientation structure described in the utility model passes through loading plate installation position angle tune Regulating device installs pitch angle regulating device by the first frame and the second frame；Orientation structure and luffing structure realization are being propped up Fixed installation on frame frame, joint debugging servo orientation and pitching drive the rotation to realize carry X-axis and Z axis.Load carry position Positioned at the underface of orientation structure, orientation and pitch rotation angular range are by envelope in the opening position of stand frame, this entirety Tower structure can not only make full use of the confined space of unmanned plane, and be able to achieve the rotation function of orientation and pitching two-freedom Energy.

Detailed description of the invention

The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.? In attached drawing:

Fig. 1 is unmanned plane carry rotation table device overall structure figure described in the utility model embodiment；

Fig. 2 is unmanned plane carry rotation table device facing structure figure described in the utility model embodiment；

Fig. 3 is bracket mount structure figure described in the utility model embodiment；

Fig. 4 is connecting board structure figure described in the utility model embodiment；

Fig. 5 is loading plate installation diagram described in the utility model embodiment；

Fig. 6 is loading plate structure chart described in the utility model embodiment.

Description of symbols:

The first frame of 1-；11- elevation servo motor；12- active tilting component；121- pitching support device；13- abnormity subtracts Baking soda；14- elevation servo motor installation position；15- banking pin mounting hole；16- pitching axis hole；17- bar shaped sliding slot；18- boss； 19- upper plate mounting hole；The rectangular weight loss groove of 110-；The second frame of 2-；The driven tilting component of 21-；3- loading plate；31- bearing servo Motor；32- orientation assembly；33- cable hole；34- fixing bolt；35- bar limit slot；The orientation 36- axis hole；37- loading plate subtracts Baking soda；4- connecting plate；41- brace；42- connecting plate weight loss groove；43- concave station；44- connecting hole.

Specific embodiment

It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can To be combined with each other.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower", The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand For limitations of the present invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result, Feature can explicitly or implicitly include one or more of the features.It is in the description of the present invention, unless another It is described, the meaning of " plurality " is two or more.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition State the concrete meaning of term in the present invention.

The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Fig.1 and Fig.2, a kind of unmanned plane carry rotation table device, unmanned plane include upper plate and lower plate, upper plate and lower plate Between connected by reinforcing rib, fuselage opens up U-type groove, and stand frame is arranged in U-type groove, and the stand frame includes being mounted on nobody The first frame 1 and the second frame 2 below machine fuselage are equipped with loading plate 3 between first frame 1 and the second frame 2, described Loading plate 3 is used for carry load；

It is rotatablely connected between the loading plate 3 and the first frame 1 and the second frame 2；

First frame 1 is equipped with pitch angle regulating device, and the pitch angle regulating device is loaded for adjusting The pitch angle of plate 3.U-shaped structure between first frame 1 and the second frame 2 and loading plate 3.

Main structure part material is 7075 aviation aluminium, and material property is excellent；The most thin position of stand frame is with a thickness of 6mm, pitching The most thin position of structural member is all satisfied use through Mechanical Calculation and Analysis with a thickness of 4mm with a thickness of 5mm, the most thin position of orientation structural member It is required that；Each structural member is that unitary block of aluminum machine plate completes the process, and without using the techniques connection such as threaded connection and welding, improves structure The general safety coefficient of part.

First frame 1 and the second frame 2 are vertically arranged in parallel；First frame 1 and 2 shape of the second frame substantially phase Seemingly.First frame 1 has lacked a special-shaped weight loss groove 13 compared to 11 installation position of elevation servo motor of the second frame more than 2.

The upper half of first frame 1 is rectangle, and lower half is up-side down triangle；The pitch angle regulating device packet Elevation servo motor 11 is included, the outside of the first frame 1 is arranged in the elevation servo motor 11；The elevation servo motor 11 is set It sets in the lower half side of the first frame 1；The middle position of the close bottom of the lower half of first frame 1 is equipped with pitch axis Hole 16 is equipped with active tilting component 12 in the pitching axis hole 16；

The elevation servo motor 11 is for driving active tilting component 12；

The upper half of second frame 2 is rectangle, and lower half is up-side down triangle；The lower half of second frame 2 is also set There is corresponding pitching axis hole 16, and is equipped with driven tilting component 21.

The active tilting component 12 includes the pitching shaft being arranged in pitching axis hole 16, the outside of the pitching shaft Involute cylindrical gear equipped with a pair of meshing, the elevation servo motor 11 drive pitching by driving involute cylindrical gear Shaft；The medial end of the pitching shaft is equipped with pitching support device 121；Pitching shaft drives 121 turns of pitching support device It is dynamic, and then drive the pitch regulation of the realization loading plate 3 of loading plate 3.

The driven tilting component 21 includes the pitching shaft being arranged in the pitching axis hole 16 of the second frame 2, Yi Jishe Set the pitching support device 121 on the inside of pitching shaft.

The two sides of the loading plate 3 respectively open up a bar limit slot 35, are designed with four in each bar limit slot 35 The two sides of screw hole, the loading plate 3 are bolted in pitching support device 121；Pitching shaft drives pitching support Device 121 rotates, and then drives the pitch regulation of the realization loading plate 3 of loading plate 3.

The side of the elevation servo motor installation position 14 of first frame 1 is additionally provided with banking pin mounting hole 15, and pitching is watched The groove that motor installation position 14 is recess is taken, is set in groove there are four 11 mounting hole of elevation servo motor, the banking pin is installed Hole 15 is for installing banking pin, and the banking pin is for the limit to 3 pitch angle of loading plate.

As shown in Figure 1 to Figure 3, the upper half of first frame 1 is set there are three rectangular weight loss groove 110, and lower half is bowed The side for facing upward motor installation position sets that there are two special-shaped weight loss grooves 13；Retain gusset moulding in crucial stress point position, passes through mechanics Emulation meets requirement, meets requirement by surveying the structure overall stiffness and intensity.

The upper half of second frame 2 is equipped with three rectangular weight loss grooves 110 identical with first frame 1；It is described The lower half of second frame 2 sets that there are three special-shaped weight loss grooves 13.Retain gusset moulding, a moulded left side in crucial stress point position The right side is arranged symmetrically.

The top of first frame 1 and the second frame 2 is vertically equipped with multiple fuselage upper plate mounting holes 19, first side The top of frame 1 and the second frame 2 is fixed on fuselage upper plate by fixing bolt 34；

The middle position of first frame 1 and the second frame 2 laterally opens up a bar shaped sliding slot 17, the bar shaped sliding slot 17 for being embedded in the lower plate of installation fuselage；

The bar shaped sliding slot 17 is equipped with multiple boss 18, and the bar shaped sliding slot 17 is on boss 18, the boss 18 Equipped with lower plate mounting hole, the boss 18 is bolted in fuselage lower plate.Pass through upper plate mounting hole 19 and bar shaped sliding slot 17 and boss 18 on next mounting hole, realize frame and fuselage connection.

As shown in Figures 1 to 4, the stand frame further includes connecting plate 4, and the connecting plate 4 is arranged in first frame 1 And second between frame 2, the end of the one end of the first frame 1 and the second frame 2 close to fuselage is arranged in the connecting plate 4；

The two sides of the connecting plate 4 are equipped with concave station 43, and the concave station 43 is equipped with connecting hole 44,1 He of the first frame Second frame 2 is bolted in the concave station 43 of connecting plate 4, and first frame 1 and the second frame 2 are all perpendicular to connection Plate 4；

The top of the connecting plate 4 is equipped with mounting hole, and connecting plate 4 is bolted on the upper plate of fuselage, and lower section is logical Bolt is crossed to be fixed in the lower plate of fuselage.

The connecting plate 4 is rectangular frame, and three vertical dowels are equipped in the rectangular frame bracket, rectangular Left and right space uniform is arranged in shape frame；Three vertical dowels reinforce connection by two braces 41, and gusset intersection makes With R3 fillet rounding off.Connecting plate 4 both plays the role of connecting the first frame 1 and the second frame 2, further through bolt and fuselage It is fixed, increase the stability of fuselage entirety.

Such as Fig. 1, Fig. 2, Fig. 5, shown in Fig. 6, orientation angles regulating device, the azimuth are additionally provided on the loading plate 3 Spending regulating device includes bearing servo motor 31 and orientation assembly 32；Orientation angles regulating device is for realizing level angle Orientation is adjusted；

The orientation assembly 32 includes direction rotating shaft, and the loading plate 3 is equipped with orientation axis hole 36, and the direction rotating shaft is set It sets in orientation axis hole 36, two angular contact ball bearings is installed on the outside of the upper end of the direction rotating shaft, realize azimuth axis about the z axis Rotational freedom；The lower end of direction rotating shaft is arranged in carry.

The loading plate 3 is equipped with bearing servo motor installation position, and the bearing servo motor 31 is vertically mounted on loading On plate 3, the bearing servo motor 31 drives direction rotating shaft rotation by the involute cylindrical gear of driving a pair of meshing, is used for Realize the transmitting of 31 output power of bearing servo motor direction rotating shaft into orientation assembly 32.

The orientation axis hole 36 each side opens up a cable hole 33, and the cable hole 33 is electrically hard for bottom Part cabling；

Loading plate weight loss groove 37 is additionally provided on the loading plate 3.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection scope within.

Claims (10)

1. a kind of unmanned plane carry rotation table device, it is characterised in that: including the stand frame being mounted on unmanned aerial vehicle body, the branch Frame frame includes the first frame (1) and the second frame (2) being mounted below unmanned aerial vehicle body, first frame (1) and second Loading plate (3) are equipped between frame (2), the loading plate (3) is used for carry load；

It is rotatablely connected between the loading plate (3) and the first frame (1) and the second frame (2)；

First frame (1) is equipped with pitch angle regulating device, and the pitch angle regulating device is for adjusting loading plate (3) pitch angle.

2. unmanned plane carry rotation table device according to claim 1, it is characterised in that: first frame (1) and second Frame (2) is vertically arranged in parallel；

The upper half of first frame (1) is rectangle, and lower half is up-side down triangle；The pitch angle regulating device includes Elevation servo motor (11), outside of elevation servo motor (11) setting in the first frame (1)；The elevation servo motor (11) it is arranged in the lower half side of the first frame (1)；The middle position of the close bottom of the lower half of first frame (1) Equipped with pitching axis hole (16), active tilting component (12) are equipped in the pitching axis hole (16)；

The elevation servo motor (11) is for driving active tilting component (12)；

The upper half of second frame (2) is rectangle, and lower half is up-side down triangle；The lower half of second frame (2) is also set There is corresponding pitching axis hole (16), and is equipped with driven tilting component (21).

3. unmanned plane carry rotation table device according to claim 2, it is characterised in that: active tilting component (12) packet The pitching shaft being arranged in pitching axis hole (16) is included, the outside of the pitching shaft is equipped with the involute Cylinder Gear of a pair of meshing Wheel, the elevation servo motor (11) drive pitching shaft by driving involute cylindrical gear；The inside of the pitching shaft End is equipped with pitching support device (121)；

The driven tilting component (21) includes the pitching shaft being arranged in the pitching axis hole (16) of the second frame (2), and Pitching support device (121) on the inside of pitching shaft is set.

4. unmanned plane carry rotation table device according to claim 3, it is characterised in that: the two sides of the loading plate (3) are each A bar limit slot (35) is opened up, is designed with four screw holes in each bar limit slot (35), the two of the loading plate (3) Side is fixed on pitching support device (121) by fixing bolt (34)；

The side of the elevation servo motor installation position (14) of first frame (1) is additionally provided with banking pin mounting hole (15), described Banking pin mounting hole (15) is for installing banking pin, and the banking pin is for the limit to loading plate (3) pitch angle.

5. unmanned plane carry rotation table device according to claim 2, it is characterised in that: the upper half of first frame (1) Portion is set there are three rectangular weight loss groove (110), and the side of the pitching motor installation position of lower half sets that there are two special-shaped weight loss grooves (13)；

The upper half of second frame (2) is equipped with three identical with first frame (1) rectangular weight loss grooves (110)；Institute The lower half for stating the second frame (2) sets that there are three special-shaped weight loss grooves (13).

6. unmanned plane carry rotation table device according to claim 5, it is characterised in that: first frame (1) and second The top of frame (2) is vertically equipped with multiple fuselage upper plate mounting holes (19), the top of first frame (1) and the second frame (2) Portion is bolted on fuselage upper plate；

The middle position of first frame (1) and the second frame (2) laterally opens up a bar shaped sliding slot (17), and the bar shaped is sliding Slot (17) is used to be embedded in the lower plate of installation fuselage；

The bar shaped sliding slot (17) is equipped with multiple boss (18), and the bar shaped sliding slot (17) runs through boss (18), the boss (18) it is equipped with lower plate mounting hole, the boss (18) is bolted in fuselage lower plate.

7. unmanned plane carry rotation table device according to claim 2, it is characterised in that: the stand frame further includes connecting plate (4), the connecting plate (4) is arranged between first frame (1) and the second frame (2), and the connecting plate (4) is arranged the The end of one end of one frame (1) and the close fuselage of the second frame (2)；

The two sides of the connecting plate (4) are equipped with concave station (43), and the concave station (43) is equipped with connecting hole (44), first frame (1) it is bolted in the concave station (43) of connecting plate (4) with the second frame (2), first frame (1) and the second frame (2) all perpendicular to connecting plate (4)；

It is bolted on the upper plate of fuselage above the connecting plate (4), lower section is bolted under fuselage On plate.

8. unmanned plane carry rotation table device according to claim 7, it is characterised in that: the connecting plate (4) is rectangle Frame, the rectangular frame bracket is interior to be equipped with three vertical dowels, space uniform arrangement in left and right in rectangular frame；Three The vertical dowel of item reinforces connection by two braces (41), and gusset intersection uses half fillet rounding off.

9. unmanned plane carry rotation table device according to claim 1, it is characterised in that: be additionally provided on the loading plate (3) Orientation angles regulating device, the orientation angles regulating device include bearing servo motor (31) and orientation assembly (32)；

The orientation assembly (32) includes direction rotating shaft, and the loading plate (3) is equipped with orientation axis hole (36), the direction rotating shaft It is arranged in orientation axis hole (36), two angular contact ball bearings is installed on the outside of the upper end of the direction rotating shaft, realizes azimuth axis around Z The rotational freedom of axis；

The loading plate (3) is equipped with bearing servo motor installation position, and the bearing servo motor (31) is vertically mounted on loading On plate (3), the bearing servo motor (31) drives direction rotating shaft rotation by the involute cylindrical gear of driving a pair of meshing.

10. unmanned plane carry rotation table device according to claim 9, it is characterised in that: a left side for the orientation axis hole (36) Right two sides respectively open up a cable hole (33), and the cable hole (33) is used for bottom electrical hardware cabling；

Loading plate weight loss groove (37) are additionally provided on the loading plate (3).