CN217804304U - Vehicle-mounted battery replacing device - Google Patents

Abstract

The utility model relates to a vehicle-mounted electricity changing device, which comprises a quick-change electricity package switching structure and a fixed bracket structure, wherein the quick-change electricity package switching structure is connected with the fixed bracket structure through a floating nut component and a buffer pin component; the fixed bracket structure comprises a bracket frame assembly, a side guide roller assembly and a bottom guide roller assembly, wherein the bracket frame assembly comprises a bottom frame, a rear upright post assembly, a dustproof baffle, a side pre-guide bent plate and a side beam assembly; the bottom frame is a rectangular frame formed by welding square pipes, and the square pipes on the two sides of the rectangular frame are provided with welding nuts used for installing the lateral guide roller assemblies. The utility model discloses mainly solve and how to utilize current rechargeable battery package to realize trading the electric function, trading difficult push-and-pull location of electric in-process battery box, locking mechanism location and requiring high, the reliability is low and with high costs scheduling problem to can realize carrying out the reliable fixed of rigidity to the battery box, effectively prevent the battery box not hard up scheduling problem under the vibration environment.

Description

Vehicle-mounted battery replacing device

The technical field is as follows:

the utility model belongs to the technical field of trade the electricity, concretely relates to on-vehicle electric installation that trades.

Background art:

from the user's aspect of use, electric automobile drives and experiences and feels good, has characteristics such as silence, quicken soon, and its use cost is also low, and the charges of electricity cost is far less than refuels the cost. The electric automobile is not provided with a complex mechanical transmission mechanism, and the maintenance is mainly aimed at battery detection and maintenance, so that the maintenance cost is low.

The current obstacles to the popularization of electric vehicles mainly lie in battery safety and power compensation efficiency, and along with the continuous progress of battery technology, the battery safety is also continuously improved. For the compensation efficiency, the power conversion mode has the inherent advantage aiming at the public field with relatively unified vehicle model specifications. In the battery replacement mode, how to solve the reliable fixation of the battery box body and the vehicle body and adapt to the requirement of frequently disassembling the use working condition is particularly important in the design of the battery box structure and the fixation structure thereof, and because the problems of long period, high opening cost and the like exist in the redevelopment of the battery replacement box at present, how to utilize the existing battery pack to realize the battery replacement function and rapidly adapt to the market demand is very important. The utility model discloses mainly solve and how to utilize current standard rechargeable battery package to realize trading the electric function, trading difficult push-and-pull location of electric in-process battery box, locking mechanism location and requiring high, the reliability is low and with high costs scheduling problem to can realize carrying out the reliable fixed of rigidity to the battery box, effectively prevent that the battery box is not hard up scheduling problem under vibration environment.

The utility model has the following contents:

in order to solve the problem, the utility model discloses a vehicle-mounted electricity changing device, it mainly makes quick change electricity package switching structure reduce inertia when contacting with the mounting bracket structure through setting up the buffering round pin subassembly and to the destruction of mounting bracket structure, make holistic stability improve, it is inseparabler that the cooperation through side crossbeam subassembly and locking Assembly makes quick change electricity package switching structure and mounting bracket structural connection, avoid the emergence of obscission, mounting bracket structure's lateral wall and bottom all are provided with wheel components in this device simultaneously, make installation and dismantlement more convenient and fast, wheel components and lateral part direction bent plate in advance can also play the guide effect to quick change electricity package switching structure, realize once fixing a position in the installation.

In order to achieve the above purpose, the utility model discloses a following technical scheme:

a vehicle-mounted battery replacing device comprises a quick-change battery pack switching structure and a fixed bracket structure, wherein the quick-change battery pack switching structure is connected with the fixed bracket structure through a floating nut assembly and a buffer pin assembly; the fixed bracket structure comprises a bracket frame assembly, a side part guide roller assembly and a bottom part guide roller assembly, wherein the bracket frame assembly comprises a bottom frame, a rear part upright post assembly, a dustproof baffle, a side part pre-guide bent plate and a side beam assembly; welding nuts for installing the side guide roller assemblies are arranged on two sides of the bottom frame, a plurality of U-shaped bending frame plates are arranged on the bottom frame, and a plurality of bottom guide roller assemblies are arranged above the U-shaped bending frame plates; the rear upright post assembly is arranged on one side of the rectangular frame and comprises four vehicle end fixing upright posts, a buffer pin mounting plate and a connector socket fixing frame plate; the four vehicle end fixing upright columns are arranged side by side and form a first space, a second space and a third space; the first space and the third space are internally provided with the buffer pin mounting plates, and the second space is internally provided with the connector socket fixing frame plate; two ends of the buffer pin mounting plate are respectively fixed on the side walls of two adjacent vehicle end fixing upright columns, two sides of the connector socket fixing frame plate are respectively connected with the side walls of the vehicle end fixing upright columns on two sides of the second space, and the bottoms of the four vehicle end fixing upright columns are connected with the bottom frame; the side beam assembly is arranged in a space between the dustproof baffle and the quick-change electric package switching structure, the floating nut is arranged inside the side beam assembly, the side beam assembly comprises a shell, a guide pin, a support column and an L-shaped support, the support column and the L-shaped support are both arranged inside the shell, the outside of one side of the shell is fixedly connected with the guide pin, and a connecting hole is formed in the outer side of the side wall of the shell below the guide pin; the L-shaped support is fixedly connected with the inside of the shell, the supporting column is arranged on the L-shaped support, the supporting column and the connecting hole are in a parallel state, a spring is arranged on the supporting column, a first end of the floating nut is connected with the spring, and a second end of the floating nut is in contact with the connecting hole; the buffer pin assembly is arranged on the buffer pin mounting plate, a first end of the buffer pin assembly is sleeved on the buffer pin mounting plate, and a second end of the buffer pin assembly is contacted with the quick-change electric package switching structure; buffer round pin subassembly includes split pin, buffer spring, buffering uide bushing and buffering round pin, the first end of buffering round pin with quick change electricity package switching structure contacts, the second end of buffering round pin with split pin connects, the outside cover of buffering round pin is equipped with the buffering round pin, the buffer spring overlaps and establishes the lateral wall outside of buffering round pin, buffer spring's first end with buffering uide bushing fixed connection, the second end of spring with the lateral wall of buffering round pin mounting panel contacts.

Preferably, the lateral guide roller assemblies are symmetrically arranged at two sides of the bracket frame; the bottom guide roller assemblies are symmetrically arranged at the bottom of the bracket frame.

Preferably, the dustproof baffle plates are symmetrically welded on two sides of the bottom frame; the lateral pre-guiding bent plates are symmetrically welded on two sides of the dustproof baffle, and the lateral pre-guiding bent plates are integrally in a horn mouth shape and have a guiding and positioning effect.

Preferably, a slotted nut is arranged on the cotter pin and used for limiting the displacement of the buffer pin assembly.

Preferably, the quick-change electric package switching structure comprises a switching frame structure, a high-voltage junction box assembly, a locking mechanism and a frame guide sleeve; the first side of the adapter frame structure is in contact with the connector socket fixing frame plate, and the second side and the third side of the adapter frame structure are parallel to the dustproof baffle plate; the high-voltage junction box assembly and the frame guide sleeves are arranged on a first side of the switching frame structure, and the two frame guide sleeves are respectively arranged on the first sides of the switching frame structure on two sides of the high-voltage junction box assembly; the two locking mechanisms are respectively arranged on the second side and the third side of the adapting frame.

Preferably, the adapting frame structure comprises a main frame structure and a locking mechanism fixing plate; the bottom of the main body frame structure is provided with a nut for connecting a battery pack; the locking mechanism fixing plates are arranged on two sides of the main body frame structure, and the locking mechanisms are arranged on the locking mechanism fixing plates; when the quick-change electric package switching structure is matched with the fixed bracket structure for use, the lower surface of the bottom of the main body frame structure is contacted with the bottom roller component, the side beam component is matched with the locking mechanism and the locking mechanism fixed plate, and the frame guide sleeve is matched with the buffer pin component.

Preferably, the bottom frame is a rectangular frame formed by welding square pipes.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) The utility model discloses be provided with the cushion round pin subassembly, the impact that the inertia that the cushion round pin subassembly can effectual reduction quick change electricity package switching structure when installation quick change electricity package switching structure played fixed bracket structure, the cushion round pin subassembly can also play the effect of direction with the frame uide bushing on the quick change electricity package switching structure mutually supports simultaneously.

(2) The utility model discloses an inside floating nut that is provided with of side beam assembly, floating nut can realize slight displacement in side beam assembly's inside for also can cooperate the installation with the mounting bracket structure under the condition that the size of quick change electricity package switching structure has the deviation, make overall structure's stability obtain effectual guarantee, avoid the emergence of obscission.

(3) The utility model discloses a lateral part direction roller components, bottom direction roller components and lateral part are the effect that the bent plate played the direction to quick change electricity package switching structure in advance, need install when fixed bracket structure at quick change electricity package switching structure, the lateral part is the bent plate that leads in advance at first plays preliminary guide effect to quick change electricity package switching structure and makes, the top of entering into fixed bracket structure that quick change electricity package switching structure can be accurate, when getting into fixed bracket structure, lateral part direction roller components and bottom direction roller components play the effect of direction to quick change electricity package switching structure, and quick inside that gets into fixed bracket structure under its drive, simultaneously under the effect of buffering round pin subassembly, reduce the impact force that the striking was brought, make quick change electricity package switching structure can be quick accurate install the inside at fixed bracket structure.

Drawings

FIG. 1 is an overall structural view of the vehicle-mounted power exchanging device of the present invention;

fig. 2 is a front view of a quick-change electricity pack switching structure of the vehicle-mounted electricity changing device of the utility model;

fig. 3 is a top view of the quick-change electric package switching structure of the vehicle-mounted electricity-changing device of the present invention;

FIG. 4 is a front view of the fixing bracket structure of the vehicle-mounted power exchanging device of the present invention;

FIG. 5 is a top view of the fixing bracket structure of the vehicle-mounted power exchanging device of the present invention;

FIG. 6 is a cross-sectional view of a side rail assembly of the on-board power transfer device of the present invention;

fig. 7 is a schematic view of the overall structure of the damper pin assembly of the vehicle-mounted power exchanging apparatus of the present invention.

Some of the drawings are illustrated below:

the battery pack comprises a 1-quick-change battery pack switching structure, a 2-fixing bracket structure, a 3-connecting arm, a 4-bracket frame assembly, a 5-side guide roller assembly, a 6-bottom guide roller assembly, a 7-floating nut, an 8-buffer pin assembly, a 9-bottom frame, a 10-rear upright post assembly, an 11-dustproof baffle, a 12-side pre-guide bent plate, a 13-side beam assembly, a 14-U-shaped bent frame plate, a 15-buffer pin mounting plate, a 16-connector socket fixing frame plate, a 17-locking mechanism, an 18-locking mechanism fixing plate, a 19-high-pressure junction box assembly, a 20-frame guide sleeve, a 21-switching frame structure, a 22-shell, a 23-guide pin, a 24-supporting column, a 25-L-shaped support, a 26-connecting hole, a 27-spring, a 28-split pin, a 29-buffer spring, a 30-buffer pin, a 31-buffer guide sleeve, a 33-slotted nut and a 34-battery pack.

Detailed Description

Exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The utility model provides a vehicle-mounted battery replacing device, as shown in fig. 1-7, which comprises a battery pack 34, a quick-change battery pack switching structure 1 and a fixed bracket structure 2, wherein the quick-change battery pack switching structure 1 is connected with the fixed bracket structure 2 through a floating nut component and a buffer pin component 8; the battery pack 34 is fixed on the quick-change electric pack switching structure 1 and is connected with the high-voltage junction box assembly 19 through a wire harness; the two fixed bracket structures 2 are respectively and symmetrically fixed on two sides of a beam of the vehicle body, and the middle of the fixed bracket structures is reinforced and supported through the connecting arm 3.

The fixed bracket structure 2 comprises a bracket frame component 4, a side guide roller component 5 and a bottom guide roller component 6, wherein the bracket frame component 4 comprises a bottom frame 9, a rear upright post component 10, a dustproof baffle plate 11, a side pre-guide bent plate 12 and a side beam component 13; the bottom frame 9 is a rectangular frame formed by welding square pipes, the square pipes on two sides of the rectangular frame are provided with welding nuts for mounting the lateral guide roller assemblies 5, the bottom frame 9 is longitudinally welded with a plurality of U-shaped bent frame plates 14, and a plurality of bottom guide roller assemblies 6,U type bent frame plates 14 are arranged above the U-shaped bent frame plates 14 and used for fixing the bottom guide roller assemblies 6 and enhancing the overall structural strength; the rear upright post is arranged on one side of the rectangular frame, and the rear upright post assembly 10 comprises four vehicle end fixing upright posts, a buffer pin mounting plate 15 and a connector socket fixing frame plate 16; the four vehicle end fixing upright columns are arranged side by side and form a first space, a second space and a third space; the first space and the third space are internally provided with a buffer pin mounting plate 15, and the second space is internally provided with a connector socket fixing frame plate 16; two ends of the buffer pin mounting plate 15 are respectively welded on the side walls of the two vehicle end fixing upright columns, two sides of the connector socket fixing frame plate 16 are respectively connected with the side walls of the two vehicle end fixing upright columns in the second space, and one ends of the four vehicle end fixing upright columns are connected with the bottom frame 9.

The side beam assembly 13 is arranged in a space between the dustproof baffle 11 and the quick-change electric package switching structure 1, a floating nut 7 is arranged inside the side beam assembly 13, the side beam assembly 13 comprises a shell 22, a guide pin 23, a support column 24 and an L-shaped support 25, the support column 24 and the L-shaped support 25 are both arranged inside the shell 22, the outside of one side of the shell 22 is fixedly connected with the guide pin 23, a connecting hole 26 is formed in the outer side wall below the guide pin 23, the shell 22 effectively prevents dust, water stain and the like in the running process of a vehicle from entering and influencing the service life of the mechanism, and meanwhile, the floating nut 7 is convenient to maintain and replace; the L-shaped support 25 is fixedly connected with the inside of the shell 22, the support column 24 is arranged on the L-shaped support 25, the support column 24 is parallel to the connecting hole 26, a spring 27 is arranged on the support column 24, the first end of the floating nut 7 is connected with the spring 27, and the second end of the floating nut 7 is in contact with the connecting hole 26; the buffer pin component 8 is arranged on the buffer pin mounting plate 15, the first end of the buffer pin component 8 is sleeved on the buffer pin mounting plate 15, and the second end of the buffer pin component 8 is in contact with the quick-change electric packet switching structure 1.

The L-shaped support 25 is a bending piece, and round holes are respectively formed in two bending edges and are respectively used for fixing the support columns 24.

The support column 24 is a cylindrical structure, a stepped shaft is arranged on one end face of the support column, the stepped shaft is inserted into a round hole of the L-shaped support 25 and fixedly connected with the round hole, and a round hole is formed in the middle of the support column 24.

The floating nut 7 is a square nut and is placed between the spring 27 and the shell 22, the front end of the square nut is provided with a horn mouth structure so that the bolt can be inserted from the side face, the position of the square nut is fixed, the rear portion of the square nut is provided with a step round hole so that the spring 27 can be inserted into the support, and the inner thread is arranged at the position close to the connecting hole 26 and used for being fixedly connected with the locking mechanism.

The spring 27 is sleeved on the supporting column 24, one end of the spring props against the inner side of the vertical face of the L-shaped support 25, the other end of the spring props against the vertical face of the nut step, the spring is in a compressed state, and the floating nut component is installed inside the side beam component 13 and is used for being matched and locked with the locking mechanism.

Buffering round pin subassembly 8 includes split pin 28, buffer spring 29, buffering uide bushing 31 and buffer pin 30, the first end of buffering round pin 30 contacts with quick change electricity package switching structure 1, the second end and the split pin 28 of buffering round pin 30 are connected, the outside that buffering round pin 30 and spliced pole are connected is established to buffering round pin 30 ways, buffer spring 29 cover is established in the outside of buffering round pin 30, buffer spring 29's first end and buffering uide bushing 31 fixed connection, spring 27's second end contacts with the lateral wall of buffering round pin mounting panel 15, be provided with slotted nut 33 on the split pin 28, slotted nut 33 plays the limiting displacement of buffering round pin subassembly 8.

The buffer pin 30 is of a cylindrical structure, the front end of the buffer pin is provided with a conical chamfer for guiding and positioning, the middle part of the buffer pin is provided with a limiting boss for limiting the guiding stroke, and the rear part of the buffer pin is provided with an external thread for being matched with the slotted nut 33 to be fixed on the buffer pin mounting plate 15.

The split pin 28 is matched with the slotted nut 33 for looseness prevention, the buffer guide sleeve 31 is of a cylindrical shaft sleeve structure and is arranged between the limiting boss and the buffer spring 29, and the buffer pin assembly 8 is matched with the frame guide sleeve 20 and is used for guiding and buffering when the battery pack 34 switching structure is to be pushed to the right position.

The lateral guide roller assemblies 5 are symmetrically arranged at two sides of the bracket frame and used for guiding and positioning the battery pack 34 transferring structure in the left and right directions in the process of pushing the battery pack 34 transferring structure into the fixed bracket structure 2; the bottom guide roller assemblies 6 are symmetrically arranged at the bottom of the bracket frame, so that the push-pull of the battery pack 34 switching structure in the battery replacement process is facilitated.

The dustproof baffles 11 are symmetrically welded on two sides of the bottom frame 9 and are used for reinforcing the integral structure and shielding dust and sewage brought by the running vehicle; the lateral pre-guiding bent plates 12 are symmetrically welded on the two side dust-proof baffle plates 11, and the whole dustproof baffle plates are in a horn mouth shape and have the functions of preliminary guiding and positioning.

The quick-change electric package switching structure 1 comprises a switching frame structure 21, a high-voltage junction box assembly 19, a locking mechanism 17 and a frame guide sleeve 20; the first side of the adapting frame structure 21 contacts with the connector socket fixing frame plate 16, and the second and third sides of the adapting frame keep parallel with the dustproof baffle plate 11; the high-voltage junction box assembly 19 and the frame guide sleeves 20 are arranged on the first side of the switching frame structure 21, the two frame guide sleeves 20 are respectively arranged on the first sides of the switching frame structure 21 on the two sides of the high-voltage junction box assembly 19, the frame guide sleeves 20 are cylindrical structures, round holes are formed in the middles of the frame guide sleeves, and the frame guide sleeves 20 are matched with the buffer pin assemblies 8 and used for buffering and positioning when the quick-change wire pack switching structure 1 is pushed in place; two locking mechanisms are provided on the second and third sides of the adaptor frame.

The adapting frame structure 21 comprises a main body frame structure and a locking mechanism fixing plate 18; the bottom of the main frame structure is provided with a nut for connecting the battery pack 34; locking mechanism fixed plate 18 sets up the both sides at the main part frame construction, and locking mechanism 17 sets up on locking mechanism fixed plate 18, and locking mechanism fixed plate 18 lower part is opened has diagonal round hole for fixed locking mechanism, and locking mechanism fixed plate 18 upper portion is opened has the round hole for with the uide pin 23 cooperation, lead just and the location battery box, guarantee locking mechanism bolt and nut fine positioning, frame uide bushing 20 and buffer round pin subassembly 8 cooperate.

The locking mechanism is a patent publication and has a self-locking function, and the battery replacing equipment can realize the battery replacing action by fastening/loosening the locking mechanisms on the two sides and pushing and pulling a vertical column at the front part of the battery pack 34 switching structure.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims (7)

1. The utility model provides a on-vehicle electric installation that trades which characterized in that: the quick-change electric package switching structure is connected with the fixed bracket structure through a floating nut component and a buffer pin component;

the fixed bracket structure comprises a bracket frame assembly, a side guide roller assembly and a bottom guide roller assembly, wherein the bracket frame assembly comprises a bottom frame, a rear upright post assembly, a dustproof baffle, a side pre-guide bent plate and a side beam assembly;

welding nuts used for installing the lateral guide roller assemblies are arranged on two sides of the bottom frame, a plurality of U-shaped bent frame plates are arranged on the bottom frame, and a plurality of bottom guide roller assemblies are arranged above the U-shaped bent frame plates;

the rear upright post assembly is arranged on one side of the bottom frame and comprises four vehicle end fixing upright posts, a buffer pin mounting plate and a connector socket fixing frame plate; the four vehicle end fixing upright columns are arranged side by side and form a first space, a second space and a third space among each other; the first space and the third space are internally provided with the buffer pin mounting plates, and the second space is internally provided with the connector socket fixing frame plate; two ends of the buffer pin mounting plate are respectively fixed on the side walls of two adjacent vehicle end fixing upright columns, two sides of the connector socket fixing frame plate are respectively connected with the side walls of the vehicle end fixing upright columns on two sides of the second space, and the bottoms of the four vehicle end fixing upright columns are connected with the bottom frame;

the side beam assembly is arranged in a space between the dustproof baffle and the quick-change electric package switching structure, the floating nut is arranged inside the side beam assembly, the side beam assembly comprises a shell, a guide pin, a support column and an L-shaped support, the support column and the L-shaped support are both arranged inside the shell, the outside of one side of the shell is fixedly connected with the guide pin, and a connecting hole is formed in the outer side of the side wall of the shell below the guide pin; the L-shaped support is fixedly connected with the inside of the shell, the supporting column is arranged on the L-shaped support, the supporting column and the connecting hole are in a parallel state, a spring is arranged on the supporting column, a first end of the floating nut is connected with the spring, and a second end of the floating nut is in contact with the connecting hole;

the buffer pin assembly is arranged on the buffer pin mounting plate, a first end of the buffer pin assembly is sleeved on the buffer pin mounting plate, and a second end of the buffer pin assembly is contacted with the quick-change electric package switching structure; buffer pin subassembly includes split pin, buffer spring, buffering uide bushing and buffering round pin, the first end of buffering round pin with quick change electricity package switching structure contacts, the second end of buffering round pin with split pin connection, the outside cover of buffering round pin is equipped with the buffering round pin, the buffer spring cover is established the lateral wall outside of buffering round pin, buffer spring's first end with buffering uide bushing fixed connection, the second end of spring with the lateral wall of buffering round pin mounting panel contacts.

2. The vehicle-mounted battery replacement device according to claim 1, characterized in that: the side guide roller assemblies are symmetrically arranged at two sides of the bracket frame; the bottom guide roller assemblies are symmetrically arranged at the bottom of the bracket frame.

3. The vehicle-mounted battery replacement device according to claim 2, characterized in that: the dustproof baffles are symmetrically welded on two sides of the bottom frame; the lateral pre-guiding bent plates are symmetrically welded on two sides of the dustproof baffle, and the lateral pre-guiding bent plates are integrally in a horn mouth shape and have a guiding and positioning effect.

4. The vehicle-mounted battery replacement device according to claim 3, characterized in that: a slotted nut is arranged on the split pin and used for limiting the displacement of the buffer pin assembly.

5. The vehicle-mounted battery replacement device according to claim 2, characterized in that: the quick-change electric package switching structure comprises a switching frame structure, a high-voltage junction box assembly, a locking mechanism and a frame guide sleeve; the first side of the adapter frame structure is in contact with the connector socket fixing frame plate, and the second side and the third side of the adapter frame structure are parallel to the dustproof baffle plate; the high-voltage junction box assembly and the frame guide sleeves are arranged on a first side of the switching frame structure, and the two frame guide sleeves are respectively arranged on the first sides of the switching frame structure on two sides of the high-voltage junction box assembly; the two locking mechanisms are respectively arranged on the second side and the third side of the switching frame.

6. The vehicle-mounted battery replacement device according to claim 5, characterized in that: the switching frame structure comprises a main body frame structure and a locking mechanism fixing plate; the bottom of the main body frame structure is provided with a nut for connecting a battery pack; the locking mechanism fixing plates are arranged on two sides of the main body frame structure, and the locking mechanisms are arranged on the locking mechanism fixing plates; when the quick-change electric package switching structure is matched with the fixed bracket structure for use, the lower surface of the bottom of the main body frame structure is contacted with the bottom guide roller assembly, the side beam assembly is matched with the locking mechanism and the locking mechanism fixed plate, and the frame guide sleeve is matched with the buffer pin assembly.

7. The vehicle-mounted battery replacement device according to claim 1, characterized in that: the bottom frame is a rectangular frame formed by welding square pipes.

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