CN216918495U - Cargo carrying table with double servo motors and cargo carrying system - Google Patents

Abstract

The utility model relates to a cargo carrying platform with double servo motors and a cargo carrying system, wherein the cargo carrying platform with the double servo motors is arranged in a frame of a lifter in a lifting manner, and comprises a cargo carrying unit, two breast board units, two transmission units and a plurality of limiting units; wherein, the two breast board units are arranged at two ends of the cargo carrying unit; the two transmission units are arranged at two ends of the cargo carrying unit, and shaft elements of the two transmission units penetrate through the corresponding breast board units and are positioned outside the cargo carrying unit; the plurality of limiting units are correspondingly arranged on the outer side wall of the cargo carrying unit and used for controlling the descending height of the cargo carrying unit. The cargo carrying platform and the cargo carrying system of the utility model relieve the limitation that the variable frequency motor occupies the bottom space or the top space, greatly shorten the occupied space of the cargo carrying platform on the bottom or the top, and have good practical value and popularization and application value.

Description

Cargo carrying table with double servo motors and cargo carrying system

Technical Field

The utility model relates to the field of elevator equipment, in particular to a cargo carrying table with double servo motors and a cargo carrying system.

Background

The lifting motor of the existing elevator loading platform basically adopts a variable frequency motor, but the variable frequency motor has larger volume, so that the occupied space is larger. Therefore, the variable-frequency motor is adopted in the existing structure, no matter how to place the variable-frequency motor, the space at the top or the bottom of the elevator can be occupied to a certain extent, so that the space at the top and the bottom in the dense warehouse can be limited, and the variable-frequency motor cannot be installed on the existing elevator cargo carrying platform under the condition that the requirements for the top and the bottom are harsh.

At present, the problem that the top or bottom space of the elevator can be occupied by installing the variable-frequency motor on the existing elevator cargo carrying platform is not provided with an effective solution.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cargo carrying platform with double servo motors and a cargo carrying system aiming at the defects in the prior art, so as to at least solve the problem that the top or bottom space of a hoist is occupied when the variable-frequency motor is installed on the existing hoist cargo carrying platform.

In order to achieve the above object, a first aspect of the present invention provides a cargo bed with dual servo motors, which is installed in a hoist frame in a liftable manner, the cargo bed with dual servo motors comprising:

a cargo carrying unit;

the two breast board units are arranged at two ends of the cargo carrying unit and used for blocking cargos at the upper end of the cargo carrying unit;

the two transmission units are arranged at two ends of the cargo carrying unit, and shaft elements of the two transmission units penetrate through the corresponding breast board units and are positioned outside the cargo carrying unit and are used for being meshed and connected with the rack device;

the limiting units are correspondingly arranged on the outer side wall of the goods carrying unit and used for controlling the height of the goods carrying unit from the ground.

Further, in the cargo bed, the cargo unit includes:

the two ends of the square frame are connected with the bottom ends of the two transmission units;

the lower end of the support element is fixedly installed at the end part of the square frame, the upper end of the support element is provided with a redundant groove and a rotating groove, and the redundant groove and the rotating groove are both rotatably sleeved on the two shaft elements of the transmission unit.

Further, in the cargo bed, the balustrade unit includes:

an interception element disposed at an end of the cargo unit;

two upright column elements vertically mounted on both sides of the end of the cargo unit;

the first ends of the two first cross beam elements are fixedly connected with the corresponding upright post elements, and the second ends of the two first cross beam elements are connected with the intercepting elements;

and the second beam element is fixedly arranged at the top ends of the two upright post elements.

Further, in the cargo bed, the transmission unit includes:

the motor element is transversely arranged at the end part of the cargo carrying unit, and both the motor element and the motor element penetrate through the cargo carrying unit and the corresponding breast board unit to be positioned outside the cargo carrying unit;

the gear element is sleeved on a shaft element of the motor element;

and the guide wheel element is sleeved on the other shaft element of the motor element and positioned on the side part of the gear element.

Further, in the cargo bed, the limiting unit includes:

a mounting element fixedly disposed on an outer side wall of the cargo unit;

a stop element adjustably mounted to the mounting element.

A second aspect of the utility model provides a cargo system with dual servo motors mounted in the elevator frame, comprising:

a cargo bed having a dual servo motor as described in any of the first aspects;

and the two rack devices are arranged on two sides in the elevator frame, one side of each rack device is meshed with the gear element of the goods carrying platform, and the other side of each rack device is in rolling connection with the guide wheel element of the goods carrying platform.

Further, in the cargo system, the cargo system further includes:

and the control device is respectively electrically connected with the two transmission units of the cargo carrying platform and is used for controlling the two transmission units to work simultaneously.

Further, in the cargo carrying system, the rack device includes:

the vertical plate unit is vertically arranged inside the elevator frame, and one side wall of the vertical plate unit is in rolling connection with the corresponding guide wheel element;

and the rack unit is arranged on the other side wall of the vertical plate unit and is in meshed connection with the corresponding gear element.

Further, in the cargo carrying system, the rack gear device further includes:

and the bottom end of the mounting unit is horizontally mounted, the middle end of the mounting unit corresponds to the limiting unit, and the top end of the mounting unit is fixedly connected with the vertical plate unit.

Further, in the cargo system, the mounting unit includes:

a first mounting plate element;

a plurality of first fixing elements mounted to the first mounting plate element;

the lower ends of the two second fixing elements are fixedly arranged at two ends of the first mounting plate element;

and the second mounting plate element is erected at the upper ends of the two second fixing elements, and the middle part of the second mounting plate element is fixedly connected with the bottom end of the vertical plate unit.

By adopting the technical scheme, compared with the prior art, the utility model has the following technical effects:

(1) the goods carrying platform and the goods carrying system can drive the goods carrying unit to ascend or descend in the elevator frame through the double transmission units, so that the problem that the top or bottom space of the elevator is occupied when the variable-frequency motor is installed on the existing elevator goods carrying platform is solved;

(2) the two transmission units are electrically connected with the control device, so that the control device can simultaneously control the two transmission units to work, and the ascending synchronism of the cargo carrying unit is ensured;

(3) the cargo carrying platform and the cargo carrying system of the utility model relieve the limitation that the variable frequency motor occupies the bottom space or the top space, greatly shorten the occupied space of the cargo carrying platform on the bottom or the top, and have good practical value and popularization and application value.

Drawings

FIG. 1 is a schematic structural diagram (I) of a cargo bed with dual servo motors according to the present invention;

FIG. 2 is a schematic structural diagram (II) of a cargo bed with dual servo motors according to the present invention;

FIG. 3 is a schematic view of the structure of part A in FIG. 2;

FIG. 4 is a schematic view of the structure of the portion B in FIG. 2;

FIG. 5 is an installed side view of a cargo system having dual servo motors of the present invention;

FIG. 6 is a schematic illustration of an installation of a cargo system having dual servo motors in accordance with the present invention;

FIG. 7 is a schematic view of a first embodiment of a dual servo motor cargo system of the present invention;

FIG. 8 is a schematic view of a dual servo motor cargo system according to the present invention;

FIG. 9 is a schematic view of the structure of the portion C in FIG. 8;

FIG. 10 is a block diagram showing the structure of a control device according to the present invention;

wherein the reference symbols are:

100. a cargo carrying platform;

110. a cargo carrying unit; 111. a square frame; 112. a stent element; 113. a redundant slot; 114. a rotating tank;

120. a balustrade unit; 121. an interception element; 122. a column element; 123. a first beam element; 124. a second beam element;

130. a transmission unit; 131. a motor element; 132. a gear element; 133. a guide wheel element;

140. a limiting unit; 141. mounting a component; 142. a spacing element;

200. a rack gear; 210. a vertical plate unit; 220. a rack unit; 230. a mounting unit; 231. a first mounting plate element; 232. A first fixing element; 233. a second fixing element; 234. a second mounting plate element;

300. and a control device.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used in this specification, the terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the utility model and simplicity in description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Furthermore, the technical features mentioned in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1, the present embodiment provides a cargo carrying platform with dual servo motors, which is installed in a frame of a lift in a lifting manner, and the cargo carrying platform 100 with dual servo motors includes a cargo carrying unit 110, two balustrade units 120, two transmission units 130, and a plurality of position limiting units 140. The loading unit 110 is used for loading cargoes and can move up and down in the elevator frame under the drive of the transmission unit 130; the two balustrade units 120 are disposed at two ends of the cargo unit 110, and are used for blocking the cargo placed at the upper end of the cargo unit 110 and preventing the cargo from falling; the two transmission units 130 are arranged at two ends of the loading unit 110, and shaft elements of the transmission units pass through the loading unit 110 and the corresponding barrier plate units 120 and are positioned outside the loading unit 110 and meshed and connected with the rack device, and are used for driving the loading unit 110 to move up and down in the hoisting machine frame in a matching way; the plurality of position limiting units 140 are disposed on the outer side wall of the cargo unit 110, and are used for controlling the height of the cargo unit 110 from the ground, preventing the cargo unit 110 from being damaged due to contact with the ground, or facilitating the leveling of the upper end surface of the cargo unit 110 with the upper end surface of the conveying line, so as to obtain the cargo.

The balustrade unit 120 is disposed on the upper side of both ends of the cargo unit 110.

The connection between the balustrade unit 120 and the cargo unit 110 includes, but is not limited to, welding and bolting.

In some embodiments, eight of the limiting units 140 are respectively disposed on the outer side walls of the cargo unit 110, and two limiting units 140 are mounted on each outer side wall of the cargo unit 110.

Among other things, stop unit 140 is used to limit the height of cargo unit 110 from the ground to facilitate docking with different devices.

For example, in the case where the loading dock 100 needs to be docked with an AGV device, the worker may adjust the position limiting unit 140 to control the loading unit 110 to be lowered to only the first height for docking with the AGV device; in the event that the loading dock 100 needs to interface with a cargo conveyor line, the worker may adjust the stop unit 140 to control the unit 110 to descend to the second height for interfacing with the conveyor line.

As shown in fig. 2 to 3, the cargo unit 110 includes a square frame 111 and a bracket member 112. Wherein, two ends of the square frame 111 are connected with the bottom ends of the two transmission units 130; the lower end of the support element 112 is fixedly mounted at the end of the square frame 111, the upper end of the support element is provided with a redundant groove 113 and a rotary groove 114, the redundant groove 113 and the rotary groove 114 are both rotatably sleeved on two shaft elements of the transmission unit 130, the support element 112 is used for supporting the two shaft elements of the motor element 131, and the shaft element of the motor element 131 is prevented from being bent under pressure.

Wherein the upper end surface of the square frame 111 is used for loading goods.

The square frame 111 is formed by splicing steel structural materials.

The longitudinal section of the bracket element 112 may be L-shaped or linear.

Preferably, the bracket member 112 is provided in an L-shape to facilitate mounting to an end of the cargo unit 110.

In some of these embodiments, the longitudinal cross-section of the redundant groove 113 is configured as a rectangle to facilitate adjustment of the position of another shaft element of the transmission unit 130 to facilitate mating connection with a different rack device.

In some embodiments, a bearing is embedded inside the rotating groove 114, and the bearing is sleeved on a shaft element of the transmission unit 130, so as to support the shaft element of the motor element 131 without affecting the rotation of the motor element 131.

In some of these embodiments, the bracket member 112 is made of a metallic material, such as stainless steel.

In some of these embodiments, the attachment of the frame member 112 to the cargo unit 110 includes, but is not limited to, bolting, welding.

As shown in fig. 2, the balustrade unit 120 includes an intercepting member 121, two pillar members 122, and two first beam members 123. The intercepting element 121 is disposed at an end of the cargo unit 110, and is used for intercepting goods at an upper end of the cargo unit 110; the two upright post members 122 are vertically installed at both sides of the end of the cargo unit 110 for intercepting taller cargo; the first ends of the two first beam elements 123 are fixedly connected with the corresponding upright elements 122, and the second ends are both connected with the interception element 121, so that the upright elements 122 are fixed on the interception element 121, and the upright elements 122 are prevented from shaking or bending; the second beam member 124 is fixedly disposed at the top end of the two upright members 122 for enhancing the strength of the two upright members 122.

Wherein, the interception element 121 is a ladder-shaped structure as a whole.

Wherein, the interception member 121, the pillar member 122, the first beam member 123 and the second beam member 124 may be made of a metal material, such as stainless steel; or made of non-metallic materials, such as wood.

The upright member 122 and the blocking member 121 may be fixedly connected or detachably connected.

Preferably, the upright member 122 is fixedly and detachably connected with the intercepting member 121, for example, the upright member 122 is connected with the intercepting member 121 by a plurality of bolts.

The connection manner of first beam member 123 and column member 122 and the connection manner of second beam member 124 and column member 122 include, but are not limited to, bolting and welding.

As shown in fig. 2 to 3, the transmission unit 130 includes a motor element 131, a gear element 132, and a guide wheel element 133. Wherein the motor element 131 is arranged transversely to the end of the cargo unit 110 for providing power; the gear element 132 is sleeved on a shaft element of the motor element 131 and is driven by the motor element 131 to rotate; the guide wheel element 133 is rotatably sleeved on the other shaft element of the motor element 131 and is located at a side portion of the gear element 132 for controlling the moving direction of the intercepting element 121.

The motor element 131 includes a forward/reverse rotation motor, an output shaft commutator, and a fixed shaft. Wherein, the positive and negative rotation motor is arranged on the square frame 111; the output shaft commutator is in transmission connection with the forward and reverse rotating motor, a transmission shaft of the output shaft commutator is sleeved in the rotating groove 114, and the transmission shaft of the output shaft commutator is sleeved in the gear element 132; one end of the fixed shaft is detachably disposed on the sidewall of the output shaft commutator, and the other end of the fixed shaft passes through the redundant groove 113 to extend to the outside of the bracket member 112 and is sleeved inside the guide wheel member 133.

Wherein the gear element 132 is a gear ring.

Wherein the guide wheel element 133 is a roller.

Specifically, a space is reserved between the gear member 132 and the guide wheel member 133, so that a rack gear can be installed between the gear member 132 and the guide wheel member 133, the gear member 132 is engaged with the rack gear, and the guide wheel member 133 is in rolling connection with the rack gear.

As shown in fig. 4, the spacing unit 140 includes a mounting member 141 and a spacing member 142. Wherein the mounting element 141 is fixedly arranged on an outer side wall of the cargo unit 110; the stop member 142 is adjustably provided to an outer side wall of the cargo unit 110 for controlling a height of the downward movement of the cargo unit 110.

The mounting element 141 and a mounting member may have a linear or L-shaped longitudinal section.

Preferably, the longitudinal section of the mounting element 141 is L-shaped.

Wherein the position limiting element 142 includes, but is not limited to, a bolt and at least two nuts.

Preferably, the bolt is threadedly sleeved at the horizontal end of the limiting element 142; the nuts are sleeved on the bolts and positioned at both sides of the horizontal end of the limiting element 142, so that a worker can control the descending height of the intercepting element 121 by the length of the bolt positioned below the limiting element 142.

Example two

As shown in fig. 5 to 8, the present embodiment provides a loading system with dual servo motors, which includes the loading platform 100 with dual servo motors and the two-rack device 200 according to embodiment 1. Wherein the cargo bed 100 is installed inside the elevator frame; the rack gear 200 is installed at both sides of the inside of the elevator frame and is engaged with the gear member 132 of the cargo bed 100 for moving the cargo bed 100 up and down along the rack gear 200 by the driving unit 130.

In some embodiments, as shown in fig. 10, the cargo system further includes a control device 300, and the control device 300 is electrically connected to the two transmission units 130 of the cargo bed 100 respectively, for controlling the two transmission units 130 to operate simultaneously.

The control device 300 includes, but is not limited to, a programmable controller, a server, a computer, and other control elements.

As shown in fig. 9, the rack device 200 includes a riser unit 210 and a rack unit 220. The vertical plate unit 210 is vertically arranged inside the frame of the elevator, and one side wall of the vertical plate unit 210 is in rolling connection with the guide wheel element 133 and used for limiting the guide wheel element 133 so as to enable the guide wheel element 133 to move along the vertical plate unit 210; the rack unit 220 is disposed at the other side of the riser unit 210 and is engaged with the gear member 132 for moving the transmission unit 130 up or down along the rack unit 220 in case that the gear member 132 rotates.

The cross section of the riser unit 210 includes, but is not limited to, T-shape, straight line shape, and L-shape.

Preferably, the riser unit 210 is T-shaped, the first end and the second end of the riser unit 210 are horizontally and longitudinally arranged, the third end is horizontally and transversely arranged, and the rack unit 220 is arranged on the side wall of the third end of the riser unit 210.

The rack device 200 further includes a mounting unit 230, a bottom end of the mounting unit 230 is horizontally mounted, a middle end of the mounting unit 230 is disposed corresponding to the limiting unit 140, and a top end of the mounting unit is fixedly connected to the riser unit 210, so as to vertically mount the riser unit 210 on the ground or a floor.

The mounting unit 230 comprises a first mounting plate element 231, a number of first fixing elements 232, at least two second fixing elements 233 and a second mounting plate element 234. The upper ends of the first fixing elements 232 are mounted on the first mounting plate elements 231, and the lower ends of the first fixing elements are fixedly mounted on the ground or the floor level and used for mounting the first mounting plate elements 231 on the ground or the floor level; the lower ends of the two second fixing members 233 are fixedly disposed at both ends of the first mounting plate member 231; the second installation plate member 234 is erected at the upper ends of the two second fixing members 233, and the middle portion of the second installation plate member 234 is fixedly connected to the bottom ends of the riser units 210.

Specifically, in a case where the cargo bed 100 moves to the bottom end of the elevator frame, the bottom end of the stopper unit 140 abuts against the upper end surface of the first mounting plate member 231 to block the cargo bed 100 from continuing to move downward.

The working principle of the utility model is as follows:

under the condition that the cargo platform 100 needs to be controlled to ascend or descend, the control device 300 controls the motor element 131 to be started, and the motor element 131 drives the gear element 132 to rotate;

since the gear member 132 is engaged with the rack unit 220, the gear member 132 can move the motor member 131 and the cargo unit 110 up or down along the rack unit 220;

in the case where the gear member 132 drives the motor member 131 and the cargo unit 110 to move downward, if the bottom end of the limiting member 142 abuts against the first mounting plate member 231, the control device 300 controls the motor member 131 to close, so that the cargo unit 110 stops moving downward to interface with the conveying line or the AGV device.

The two servo motors (motor elements 131) control the gear element 132 to perform lifting movement, and the gears are controlled to realize transmission through the synchronism of the two servo motors, so that the mounting mode of the servo motors greatly shortens the occupied space of the goods carrying platform 100 on the bottom or the top, the goods carrying platform 100 can not be limited by the height of goods in a project, the structural strength and the weight of the goods carrying platform 100 are guaranteed, the height requirements of the goods in various projects are met, the ground clearance of the goods carrying platform 100 is greatly shortened, and the ground clearance of a layer of cross beam track of a goods shelf abutted with a frame of a hoist is saved.

The cargo carrying platform 100 and the cargo carrying system are theoretically not influenced by cargo height limitation, the limitation of the dense crying cargo storage height is solved, the storage positions of cargo SKUs are increased, the possibility of one-layer connection equipment type is increased, and the number of the storage positions of the dense vertical warehouse is increased.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A cargo bed with double servo motors is characterized in that the cargo bed with the double servo motors is arranged in a hoisting machine frame in a lifting way, and the cargo bed (100) with the double servo motors comprises:

a cargo unit (110);

the two breast board units (120) are arranged at two ends of the cargo unit (110) and used for blocking cargos at the upper end of the cargo unit (110);

two transmission units (130), two transmission units (130) are arranged at two ends of the cargo unit (110), and shaft elements of the transmission units penetrate through the corresponding sideboard units (120) and are positioned outside the cargo unit (110) and are used for being meshed and connected with the rack device;

the limiting units (140) are correspondingly arranged on the outer side wall of the cargo unit (110) and used for controlling the height of the cargo unit (110) from the ground.

2. The cargo bed according to claim 1, characterized in that the cargo unit (110) comprises:

the two ends of the square frame (111) are connected with the bottom ends of the two transmission units (130);

the lower end of the support element (112) is fixedly mounted at the end part of the square frame (111), the upper end of the support element (112) is provided with a redundant groove (113) and a rotary groove (114), and the redundant groove (113) and the rotary groove (114) are both rotatably sleeved on two shaft elements of the transmission unit (130).

3. The cargo bed according to claim 1, wherein the balustrade unit (120) comprises:

-a catch element (121), said catch element (121) being arranged at an end of said cargo unit (110);

two upright members (122), the two upright members (122) being vertically mounted on either side of an end of the cargo unit (110);

two first beam elements (123), the first ends of the two first beam elements (123) being fixedly connected to the corresponding upright elements (122), the second ends being connected to the interception element (121);

a second beam element (124), said second beam element (124) being fixedly arranged at the top ends of both said pillar elements (122).

4. The cargo bed according to claim 1, characterized in that the transmission unit (130) comprises:

a motor element (131), the motor element (131) being transversely disposed at an end of the cargo unit (110), both elements of which pass through the cargo unit (110) and the corresponding balustrade unit (120) to be located outside the cargo unit (110);

the gear element (132), the said gear element (132) is set in a shaft element of the said motor element (131);

the guide wheel element (133) is sleeved on the other shaft element of the motor element (131) and positioned at the side part of the gear element (132).

5. The cargo bed according to claim 1, characterized in that the stop unit (140) comprises:

a mounting element (141), the mounting element (141) being fixedly arranged at an outer side wall of the cargo unit (110);

a stop element (142), the stop element (142) being adjustably mounted to the mounting element (141).

6. A cargo carrying system with dual servo motors, mounted in a hoist frame, comprising:

the cargo bed (100) with dual servo motors as claimed in any of claims 1 to 5;

two rack devices (200), two rack devices (200) are arranged on two sides of the inner part of the elevator frame, one side of the rack devices is meshed with the gear element (132) of the goods carrying platform (100) and the other side is in rolling connection with the guide wheel element (133) of the goods carrying platform (100).

7. The cargo carrying system of claim 6, further comprising:

the control device (300) is electrically connected with the two transmission units (130) of the cargo carrying platform (100) respectively and used for controlling the two transmission units (130) to work simultaneously.

8. The cargo carrying system according to claim 6, wherein said rack arrangement (200) comprises:

a riser unit (210), the riser unit (210) being vertically mounted inside the elevator frame, one side wall of which is in rolling connection with the corresponding guide wheel element (133);

the rack unit (220) is arranged on the other side wall of the vertical plate unit (210) and is in meshed connection with the corresponding gear element (132).

9. The cargo carrying system according to claim 8, wherein said rack arrangement (200) further comprises:

the bottom end of the mounting unit (230) is horizontally mounted, the middle end of the mounting unit (230) corresponds to the limiting unit (140), and the top end of the mounting unit is fixedly connected with the vertical plate unit (210).

10. The cargo carrying system according to claim 9, wherein the mounting unit (230) comprises:

a first mounting plate element (231);

a number of first fixation elements (232), a number of said first fixation elements (232) being mounted to said first mounting plate element (231);

at least two second fixing elements (233), the lower ends of the two second fixing elements (233) are fixedly arranged at two ends of the first mounting plate element (231);

the second installation plate element (234) is erected at the upper ends of the two second fixing elements (233), and the middle part of the second installation plate element (234) is fixedly connected with the bottom end of the riser unit (210).

Images