Built-in door fitting

Abstract

The invention discloses a built-in door fixture, which relates to the technical field of automobile manufacturing. The built-in door fixture comprises a main body frame, clamping mechanisms for door openings on both sides, two door positioning mechanisms, a main side wall positioning mechanism, a secondary side wall positioning mechanism, a door opening positioning mechanism, a door guiding mechanism, a door lifting mechanism, a side wall door opening positioning mechanism, and two limit mechanisms. The invention solves the problems of poor consistency in the installation and adjustment process of automobile body-in-white doors, large investment and large space occupied by external assembly systems, and great difficulty in maintenance. The fixture is compact and light, low in cost, easy to use and maintain, and high in precision.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, in particular to a built-in vehicle door fitting. Background Art

[0002] At present, when adjusting the gap surface difference of the four doors during the assembly of the automobile body in white, the tooling for assembling the doors generally adopts external fixtures. The external fixtures include two major systems: the body frame positioning system and the door assembly positioning system. The body frame positioning system is generally composed of a positioning mechanism and a clamping mechanism. The door assembly positioning system includes an aerial steel structure, a slide rail system, and a hanger system. It has a complex structure, requires large initial design investment, requires a large equipment installation site, and is difficult to be compatible with other models in the later stage. If the fixtures are not used to assemble the doors, the employees’ workload is high, the efficiency is low, and there are serious complaints. Summary of the invention

[0003] In view of the defects existing in the prior art, the purpose of the present invention is to provide a built-in door fixture, which can solve the problem that the external door fixture has high investment, high requirements for the production line and long cycle, and high intensity of adjustment work without the fixture. The fixture is small and light (total weight is about 10-15kg), with high precision, easy to use, high efficiency, and no need for other auxiliary equipment and low investment.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a built-in door fixture, including a main frame, and also including side door opening clamping mechanisms, two door positioning mechanisms, a side wall main positioning mechanism, a side wall secondary positioning mechanism, a door opening positioning mechanism, a door guide mechanism, a door lifting mechanism, a side wall door opening positioning mechanism, and two limit mechanisms; the main frame includes a horizontal section and a vertical section arranged at the lower right end of the horizontal section; the horizontal section is provided with a plurality of magnetic positioning mechanisms; the side door opening clamping mechanisms are respectively arranged on the left and right sides of the horizontal section, the side door opening clamping mechanism on the left side is used to clamp the rear tooth edge of the side door opening, and the side door opening clamping mechanism on the right side is used to clamp the front tooth edge of the side door opening; the two door positioning mechanisms The mechanisms are respectively arranged on the left and right sides of the horizontal section, for positioning the door and controlling the gap between the door and the A-pillar and the B-pillar; the side panel main positioning mechanism is arranged on the right side of the horizontal section, the side panel secondary positioning mechanism is arranged on the left side of the horizontal section, and the door opening positioning mechanism is arranged on the left side of the horizontal section, all of which are used for positioning the built-in door fittings; the door guide mechanism is arranged on the left side of the horizontal section, for controlling the inner gap between the door and the side panel, so as to facilitate the introduction of the door; the door lifting mechanism is arranged on the lower side of the vertical section, for auxiliary lifting of the door; the side panel door opening positioning mechanism is arranged on the lower side of the vertical section, for positioning the side panel door opening tooth edge; the two limiting mechanisms are both arranged on the lower side of the vertical section, for adjusting the surface difference between the door and the lower part of the side panel.

[0005] Further improvements are as follows: the side door opening clamping mechanism includes a fixed clamping block, a hinge seat, a handle, a movable clamping plate, and a connecting arm; the fixed clamping block is arranged on a side of the main frame facing the vehicle door; the hinge seat is arranged on a side of the main frame facing away from the vehicle door; the handle is hinged to the hinge seat; one end of the connecting arm is hinged to the hinge seat, and the other end of the connecting arm is provided with a movable clamping block adapted to the fixed clamping block; one end of the movable clamping plate is hinged to the middle part of the connecting arm, and the other end of the movable clamping plate is hinged to the middle part of the handle.

[0006] Further improvements are: the vehicle door positioning mechanism includes a first mounting seat, a first connecting block, and a pin seat; the first mounting seat is fixedly connected to the main frame; the first connecting block is an L-shaped structure, one side of the first connecting block is connected to the first mounting seat, and the other side of the first connecting block is connected to the pin seat; a first positioning pin is arranged on the pin seat, and the head of the first positioning pin is provided with two positioning surfaces opposite to each other.

[0007] Further improvements are: the main positioning mechanism of the side enclosure includes a second mounting seat, a second connecting block, a first mounting plate, and a first connecting plate; the second mounting seat is fixedly connected to the main frame; the second connecting block is in an L-shaped structure, one side of the second connecting block is connected to the second mounting seat, and the other side of the second connecting block is connected to the first connecting plate; a first weight-reducing hole is provided on the first connecting plate, and the first connecting plate is connected to the first mounting plate through a first inclined transition plate; a second positioning pin is provided on the first mounting plate; the secondary positioning mechanism of the side enclosure includes a third mounting seat, a third connecting block and a second mounting plate; the third mounting seat is fixedly connected to the main frame; the third connecting block is in an L-shaped structure, one side of the third connecting block is connected to the third mounting seat, and the other side of the third connecting block is connected to the second mounting plate; a third positioning pin is provided on the second mounting plate.

[0008] Further improvements are: the door guide mechanism includes a fourth mounting seat and a second connecting plate; the fourth mounting seat is fixedly connected to the main frame; a second weight-reducing hole is provided on the second connecting plate, one end of the second connecting plate is connected to the fourth mounting seat, and the other end of the second connecting plate is bent to form a first limiting plate; a third weight-reducing hole is provided on the first limiting plate.

[0009] Further improvements are: the door opening positioning mechanism has a fifth mounting seat and a third connecting plate; the fifth mounting seat is fixedly connected to the main frame; the third connecting plate is provided with a fourth weight-reducing hole, one end of the third connecting plate is connected to the fifth mounting seat, and the other end of the third connecting plate is bent to form a second limiting plate.

[0010] Further improvements are: the door lifting mechanism includes a sixth mounting seat, a fourth connecting plate, and a fifth connecting plate; the sixth mounting seat is fixedly connected to the main frame; the fourth connecting plate is provided with a fifth weight-reducing hole, one end of the fourth connecting plate is connected to the sixth mounting seat, and the other end of the fourth connecting plate is connected to one end of the fifth connecting plate through a second inclined transition plate; the fifth connecting plate is provided with a sixth weight-reducing hole, the other end of the fifth connecting plate is bent to form a support plate, and a support block is provided on the support plate.

[0011] A further improvement is that: the side door opening positioning mechanism comprises a third mounting plate, a third inclined transition plate and a third limiting plate which are connected in sequence; the third mounting plate is fixedly connected to the main frame; and a limiting opening groove is arranged on the third limiting plate.

[0012] A further improvement is that the limiting mechanism comprises a first mounting block fixedly connected to the main frame, and one end of the first mounting block is bent to form a limiting block.

[0013] A further improvement is that the magnetic positioning mechanism includes a second mounting block and a seventh mounting seat; the second mounting block is fixedly connected to the main frame, the seventh mounting seat is connected to the second mounting block, and a magnet is provided on the seventh mounting seat.

[0014] The beneficial effects of the present invention are:

[0015] The invention solves the problems of poor consistency in the assembly and adjustment process of automobile body-in-white doors, large investment and large space occupied by external assembly systems, and great difficulty in maintenance. The fixture is small and light, low in cost, easy to use and maintain, and high in precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional diagram of a built-in vehicle door fixture according to an embodiment of the present invention;

[0017] Figure 2 It is a front view of the built-in vehicle door fitting according to an embodiment of the present invention;

[0018] Figure 3 A three-dimensional diagram of a side panel door opening clamping mechanism in an embodiment of the present invention;

[0019] Figure 4 A three-dimensional diagram of the side panel door opening clamping mechanism from another perspective in an embodiment of the present invention;

[0020] Figure 5 It is a structural schematic diagram of a door positioning mechanism in an embodiment of the present invention;

[0021] Figure 6 It is a structural schematic diagram of the side panel main positioning mechanism in an embodiment of the present invention;

[0022] Figure 7It is a structural schematic diagram of the side enclosure secondary positioning mechanism in an embodiment of the present invention;

[0023] Figure 8 It is a structural schematic diagram of a door guide mechanism in an embodiment of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of a door opening positioning mechanism in an embodiment of the present invention;

[0025] Fig.10 It is a structural schematic diagram of a door lifting mechanism in an embodiment of the present invention;

[0026] Fig.11 Schematic diagram of the structure of the side door opening positioning mechanism in an embodiment of the present invention;

[0027] Fig.12 It is a structural schematic diagram of the limiting mechanism in an embodiment of the present invention;

[0028] Fig.13 It is a structural schematic diagram of a magnetic positioning mechanism in an embodiment of the present invention;

[0029] Fig.14 Schematic diagram of the working state of the built-in door fitting in the embodiment of the present invention.

[0030] Reference numerals:

[0031] 100-main frame; 101-horizontal section; 102-vertical section; 103-reinforcement plate;

[0032] 200-side door opening clamping mechanism; 201-hinged seat; 202-handle; 203-movable clamping plate; 204-connecting arm; 205-movable clamping block; 206-fixed clamping block;

[0033] 300-door positioning mechanism; 301-first mounting seat; 302-first connecting block; 303-pin seat; 304-first positioning pin; 305-positioning surface;

[0034] 400-side enclosure main positioning mechanism; 401-second mounting seat; 402-second connecting block; 403-first connecting plate; 404-first weight-reducing hole; 405-first inclined transition plate; 406-first mounting plate; 407-second positioning pin;

[0035] 500-side enclosure secondary positioning mechanism; 501-third mounting seat; 502-third connecting block; 503-second mounting plate; 504-third positioning pin;

[0036] 600-door guide mechanism; 601-fourth mounting seat; 602-second connecting plate; 603-second weight reduction hole; 604-first limiting plate; 605-third weight reduction hole;

[0037] 700-door opening positioning mechanism; 701-fifth mounting seat; 702-third connecting plate; 703-second limiting plate; 704-fourth weight reduction hole;

[0038] 800-door lifting mechanism; 801-sixth mounting seat; 802-fourth connecting plate; 803-fifth weight-reducing hole; 804-fifth connecting plate; 805-sixth weight-reducing hole; 806-supporting plate; 807-supporting block; 808-second inclined transition plate;

[0039] 900-side door opening positioning mechanism; 901-third mounting plate; 902-third inclined transition plate; 903-third limiting plate; 904-limiting opening groove;

[0040] 1000-limiting mechanism; 1001-first mounting block; 1002-limiting block;

[0041] 1100 - magnetic positioning mechanism; 1101 - second mounting block; 1102 - seventh mounting seat; 1103 - magnet. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0043] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0045] The following is a further description of the specific embodiments of the present invention in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the present invention are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the present invention, but cannot be understood as limiting the present invention.

[0046] See also Figure 1 and Fig.14 As shown, an embodiment of the present invention provides a built-in door fixture, including a main frame 100, and also including two side wall door opening clamping mechanisms 200, two door positioning mechanisms 300, a side wall main positioning mechanism 400, a side wall secondary positioning mechanism 500, a door opening positioning mechanism 700, a door guide mechanism 600, a door lifting mechanism 800, a side wall door opening positioning mechanism 900, and two limiting mechanisms 1000;

[0047] See also Figure 2 As shown, the main frame 100 includes a horizontal section 101 and a vertical section 102 arranged at the lower right end of the horizontal section 101; the horizontal section 101 is provided with a plurality of magnetic positioning mechanisms 1100; specifically, a reinforcing plate 103 is provided between the horizontal section 101 and the vertical section 102. In this embodiment, four magnetic positioning mechanisms 1100 are provided, which are respectively arranged at the edges of the four sides of the horizontal section 101. The main frame is used to install and position the side door opening teeth and the door positioning mechanism, and is made of aluminum alloy to reduce the overall weight.

[0048] The side door opening clamping mechanisms 200 are respectively arranged on the left and right sides of the horizontal section 101. The side door opening clamping mechanism 200 located on the left side is used to clamp the rear edge of the side door opening, and the side door opening clamping mechanism 200 located on the right side is used to clamp the front edge of the side door opening.

[0049] The two door positioning mechanisms 300 are respectively arranged on the left and right sides of the horizontal section 101 for accurate positioning of the door. They can be adjusted in three directions and mainly control the gap between the door and the A and B pillars, with a positioning accuracy of ±0.1mm.

[0050] The side panel main positioning mechanism 400 is arranged on the right side of the horizontal section 101, the side panel secondary positioning mechanism 500 is arranged on the left side of the horizontal section 101, and the door opening positioning mechanism 700 is arranged on the left side of the horizontal section 101, all of which are used for positioning the built-in vehicle door fittings;

[0051] The door guide mechanism 600 is arranged on the left side of the horizontal section 101, and is used to control the inner gap between the door and the side panel, and to pre-introduce the door into the positioning system;

[0052] The door lifting mechanism 800 is arranged at the lower side of the vertical section 102 to assist in lifting the door and avoid positioning deviation caused by the gravity of the door.

[0053] The side panel door opening positioning mechanism 900 is disposed at the lower side of the vertical section 102 and is used to position the side panel door opening edge;

[0054] The two limiting mechanisms 1000 are both arranged at the lower side of the vertical section 102 for adjusting the surface difference between the vehicle door and the lower part of the side panel.

[0055] See also Figure 3 and Figure 4 As shown, the side door opening clamping mechanism 200 includes a fixed clamping block 206, a hinge seat 201, a handle 202, a movable clamping plate 203, and a connecting arm 204; the fixed clamping block 206 is arranged on a side of the main frame 100 facing the vehicle door; the hinge seat 201 is arranged on a side of the main frame 100 away from the vehicle door; the handle 202 is hinged to the hinge seat 201; one end of the connecting arm 204 is hinged to the hinge seat 201, and the other end of the connecting arm 204 is provided with a movable clamping block 205 adapted to the fixed clamping block 206; one end of the movable clamping plate 203 is hinged to the middle part of the connecting arm 204, and the other end of the movable clamping plate 203 is hinged to the middle part of the handle 202.

[0056] See also Figure 5 As shown, the door positioning mechanism 300 includes a first mounting seat 301, a first connecting block 302, and a pin seat 303; the first mounting seat 301 is fixedly connected to the main frame 100; the first connecting block 302 is L-shaped, one side of the first connecting block 302 is connected to the first mounting seat 301, and the other side of the first connecting block 302 is connected to the pin seat 303; a first positioning pin 304 is arranged on the pin seat 303, and the head of the first positioning pin 304 is provided with two positioning surfaces 305 opposite to each other.

[0057] See also Figure 6 As shown, the side enclosure main positioning mechanism 400 includes a second mounting seat 401, a second connecting block 402, a first mounting plate 406, and a first connecting plate 403; the second mounting seat 401 is fixedly connected to the main frame 100; the second connecting block 402 is an L-shaped structure, one side of the second connecting block 402 is connected to the second mounting seat 401, and the other side of the second connecting block 402 is connected to the first connecting plate 403; the first connecting plate 403 is provided with a first weight-reducing hole 404, and the first connecting plate 403 is connected to the first mounting plate 406 through a first inclined transition plate 405; the first mounting plate 406 is provided with a second positioning pin 407;

[0058] See also Figure 7As shown, the side enclosure secondary positioning mechanism 500 includes a third mounting seat 501, a third connecting block 502 and a second mounting plate 503; the third mounting seat 501 is fixedly connected to the main frame 100; the third connecting block 502 is an L-shaped structure, one side of the third connecting block 502 is connected to the third mounting seat 501, and the other side of the third connecting block 502 is connected to the second mounting plate 503; a third positioning pin 504 is provided on the second mounting plate 503.

[0059] See also Figure 8 As shown, the door guide mechanism 600 includes a fourth mounting seat 601 and a second connecting plate 602; the fourth mounting seat 601 is fixedly connected to the main frame 100; the second connecting plate 602 is provided with a second weight reduction hole 603, one end of the second connecting plate 602 is connected to the fourth mounting seat 601, and the other end of the second connecting plate 602 is bent to form a first limiting plate 604; the first limiting plate 604 is provided with a third weight reduction hole 605.

[0060] See also Fig. 9 As shown, the door opening positioning mechanism 700 includes a fifth mounting seat 701 and a third connecting plate 702; the fifth mounting seat 701 is fixedly connected to the main frame 100; a fourth weight reduction hole 704 is provided on the third connecting plate 702, one end of the third connecting plate 702 is connected to the fifth mounting seat 701, and the other end of the third connecting plate 702 is bent to form a second limiting plate 703.

[0061] See also Fig.10 As shown, the door lifting mechanism 800 includes a sixth mounting seat 801, a fourth connecting plate 802, and a fifth connecting plate 804; the sixth mounting seat 801 is fixedly connected to the main frame 100; the fourth connecting plate 802 is provided with a fifth weight-reducing hole 803, one end of the fourth connecting plate 802 is connected to the sixth mounting seat 801, and the other end of the fourth connecting plate 802 is connected to one end of the fifth connecting plate 804 through a second inclined transition plate 808; the fifth connecting plate 804 is provided with a sixth weight-reducing hole 805, and the other end of the fifth connecting plate 804 is bent to form a support plate 806, and a support block 807 is provided on the support plate 806.

[0062] See also Fig.11 As shown, the side door opening positioning mechanism 900 includes a third mounting plate 901 , a third inclined transition plate 902 and a third limiting plate 903 which are connected in sequence; the third mounting plate 901 is fixedly connected to the main frame 100 ; and a limiting opening groove 904 is provided on the third limiting plate 903 .

[0063] See also Fig.12 As shown, the limiting mechanism 1000 includes a first mounting block 1001 fixedly connected to the main frame 100 , and one end of the first mounting block 1001 is bent to form a limiting block 1002 .

[0064] See also Fig.13 As shown, the magnetic positioning mechanism 1100 includes a second mounting block 1101 and a seventh mounting seat 1102 ; the second mounting block 1101 is fixedly connected to the main frame 100 , the seventh mounting seat 1102 is connected to the second mounting block 1101 , and a magnet 1103 is disposed on the seventh mounting seat 1102 .

[0065] When in use, the positioning mechanism positions the fixture on the edge of the side door hole, clamps the two manual clamps, positions the door on the fixture, and the magnet on the fixture firmly holds the door. After the operator tightens the door hinge bolts, he opens the door, takes out the fixture, and assembles the next car body.

[0066] In the description of the specification, the description with reference to the terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention, and the schematic expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0067] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A built-in vehicle door fitting, comprising a main frame (100), characterized in that: It also includes side-surround door opening clamping mechanisms (200), two door positioning mechanisms (300), a side-surround main positioning mechanism (400), a side-surround secondary positioning mechanism (500), a door opening positioning mechanism (700), a door guiding mechanism (600), a door lifting mechanism (800), a side-surround door opening positioning mechanism (900), and two limiting mechanisms (1000); The main frame (100) comprises a horizontal section (101) and a vertical section (102) arranged at the lower right end of the horizontal section (101); the horizontal section (101) is provided with a plurality of magnetic positioning mechanisms (1100); The side door opening clamping mechanisms (200) are respectively arranged on the left and right sides of the horizontal section (101); the side door opening clamping mechanism (200) located on the left side is used to clamp the rear edge of the side door opening, and the side door opening clamping mechanism (200) located on the right side is used to clamp the front edge of the side door opening; Two door positioning mechanisms (300) are respectively arranged on the left and right sides of the horizontal section (101) and are used for positioning the door and controlling the gap between the door and the A-pillar and the B-pillar; The side panel main positioning mechanism (400) is arranged on the right side of the horizontal section (101), the side panel secondary positioning mechanism (500) is arranged on the left side of the horizontal section (101), and the door opening positioning mechanism (700) is arranged on the left side of the horizontal section (101), all of which are used for positioning the built-in vehicle door fittings; The door guide mechanism (600) is arranged on the left side of the horizontal section (101) and is used to control the inner gap between the door and the side panel to facilitate the introduction of the door; The door lifting mechanism (800) is arranged on the lower side of the vertical section (102) and is used for auxiliary lifting of the door; The side enclosure door opening positioning mechanism (900) is arranged at the lower side of the vertical section (102) and is used to position the tooth edge of the side enclosure door opening; The two limiting mechanisms (1000) are both arranged on the lower side of the vertical section (102) and are used to adjust the surface difference between the vehicle door and the lower part of the side panel; The side panel door opening clamping mechanism (200) comprises a fixed clamping block (206), an articulated seat (201), a handle (202), a movable clamping plate (203), and a connecting arm (204); the fixed clamping block (206) is arranged on a side of the main frame (100) facing the vehicle door; the articulated seat (201) is arranged on a side of the main frame (100) facing away from the vehicle door; the handle (202) is hinged to the articulated seat (201); one end of the connecting arm (204) is hinged to the articulated seat (201), and the other end of the connecting arm (204) is provided with a movable clamping block (205) adapted to the fixed clamping block (206); one end of the movable clamping plate (203) is hinged to the middle of the connecting arm (204), and the other end of the movable clamping plate (203) is hinged to the middle of the handle (202); The door positioning mechanism (300) comprises a first mounting seat (301), a first connecting block (302), and a pin seat (303); the first mounting seat (301) is fixedly connected to the main frame (100); the first connecting block (302) is in an L-shaped structure, one side of the first connecting block (302) is connected to the first mounting seat (301), and the other side of the first connecting block (302) is connected to the pin seat (303); a first positioning pin (304) is provided on the pin seat (303), and the head of the first positioning pin (304) is provided with two positioning surfaces (305) opposite to each other; The side enclosure main positioning mechanism (400) comprises a second mounting seat (401), a second connecting block (402), a first mounting plate (406), and a first connecting plate (403); the second mounting seat (401) is fixedly connected to the main frame (100); the second connecting block (402) is in an L-shaped structure, one side of the second connecting block (402) is connected to the second mounting seat (401), and the other side of the second connecting block (402) is connected to the first connecting plate (403); a first weight-reducing hole (404) is provided on the first connecting plate (403), and the first connecting plate (403) is connected to the second connecting plate (403) via a first inclined transition plate (405). The side enclosure secondary positioning mechanism (500) comprises a third mounting seat (501), a third connecting block (502) and a second mounting plate (503); the third mounting seat (501) is fixedly connected to the main frame (100); the third connecting block (502) is in an L-shaped structure, one side of the third connecting block (502) is connected to the third mounting seat (501), and the other side of the third connecting block (502) is connected to the second mounting plate (503); the second mounting plate (503) is provided with a third positioning pin (504); The door guide mechanism (600) comprises a fourth mounting seat (601) and a second connecting plate (602); the fourth mounting seat (601) is fixedly connected to the main frame (100); the second connecting plate (602) is provided with a second weight-reducing hole (603); one end of the second connecting plate (602) is connected to the fourth mounting seat (601), and the other end of the second connecting plate (602) is bent to form a first limiting plate (604); the first limiting plate (604) is provided with a third weight-reducing hole (605); The door opening positioning mechanism (700) comprises a fifth mounting seat (701) and a third connecting plate (702); the fifth mounting seat (701) is fixedly connected to the main frame (100); a fourth weight-reducing hole (704) is provided on the third connecting plate (702); one end of the third connecting plate (702) is connected to the fifth mounting seat (701), and the other end of the third connecting plate (702) is bent to form a second limiting plate (703); The door lifting mechanism (800) comprises a sixth mounting seat (801), a fourth connecting plate (802), and a fifth connecting plate (804); the sixth mounting seat (801) is fixedly connected to the main frame (100); a fifth weight-reducing hole (803) is provided on the fourth connecting plate (802); one end of the fourth connecting plate (802) is connected to the sixth mounting seat (801), and the other end of the fourth connecting plate (802) is connected to one end of the fifth connecting plate (804) via a second inclined transition plate (808); a sixth weight-reducing hole (805) is provided on the fifth connecting plate (804), and the other end of the fifth connecting plate (804) is bent to form a supporting plate (806), and a supporting block (807) is provided on the supporting plate (806); The side door opening positioning mechanism (900) comprises a third mounting plate (901), a third inclined transition plate (902) and a third limiting plate (903) which are connected in sequence; the third mounting plate (901) is fixedly connected to the main frame (100); and a limiting opening groove (904) is provided on the third limiting plate (903); The limiting mechanism (1000) comprises a first mounting block (1001) fixedly connected to the main frame (100), and one end of the first mounting block (1001) is bent to form a limiting block (1002); The magnetic positioning mechanism (1100) comprises a second mounting block (1101) and a seventh mounting seat (1102); the second mounting block (1101) is fixedly connected to the main frame (100), the seventh mounting seat (1102) is connected to the second mounting block (1101), and a magnet (1103) is arranged on the seventh mounting seat (1102).

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