Milk vehicle with improved structure

Abstract

A milk vehicle with an improved structure comprises a left frame, a front frame, a rear frame and an opening and closing door, a left longitudinal pipe of the front frame is hinged to a front longitudinal pipe of the left frame, a left longitudinal pipe of the rear frame is hinged to a rear longitudinal pipe of the left frame, a pair of opening and closing door bolts is arranged on the front longitudinal pipe of the opening and closing door, and a pair of bolt seats is arranged on the right side face of a right longitudinal pipe of the front frame. The anti-collision door is characterized in that a front anti-collision protrusion is arranged on the right side face of the right longitudinal pipe of the front frame, a rear anti-collision protrusion is arranged on the right side face of the right longitudinal pipe of the rear frame, and the right end faces of the front anti-collision protrusion and the rear anti-collision protrusion extend out of the right side face of the front longitudinal pipe of the opening and closing door; an opening and closing door anti-movement limiting mechanism is fixed between the opposite sides of the lower parts of the left longitudinal pipe and the right longitudinal pipe of the rear frame; a front frame right longitudinal pipe holding mechanism is arranged at the upper end of the front frame right longitudinal pipe, and a rear frame right longitudinal pipe holding mechanism is arranged at the upper end of the rear frame right longitudinal pipe. The device has the advantages that the opening and closing door, the opening and closing door bolt and the bolt seat are effectively protected; the movement situation is avoided; and labor-saving pushing and comfortable holding are embodied.

Description

Technical Field

[0001] The utility model belongs to the technical field of commercial facilities, and in particular relates to a milk cart with an improved structure. Background Art

[0002] A milk truck is a special vehicle used by milk and dairy product manufacturers or storage and transit departments to deliver milk to self-service supermarkets. Usually, the truck and the milk are placed in the supermarket. In many cases, in order to prevent milk and dairy products from spoiling prematurely within their shelf life, the truck and the milk must be delivered to the supermarket when the supermarket opens for business every day. Before the supermarket closes every day, the truck and the milk are taken back to the cold storage to keep them in a refrigerated state.

[0003] Technical information of milk carts with the aforementioned application features can be found in the public Chinese patent documents, such as CN219361094U which recommends "a milk cart". This patent scheme can objectively be reflected in the technical effect column of its specification, which states that "the left and right shelves can be locked without shaking whether in a horizontal state or a vertical state, which is beneficial to improve stability during use and is convenient for storage and transportation." However, there are still the following deficiencies: first, since the right column of the front frame faces the side of the opening and closing door, i.e., the right side, and there is no effective protection measure for the door, when the milk and dairy products are loaded and the opening and closing door is locked with the above-mentioned right column, adjacent milk carts may collide with each other due to the bumps of the transport vehicle, especially since the anti-collision or impact resistance of the locking component of the opening and closing door (usually a longitudinal latch-type locking component) and the latch seat on the right side of the right column of the above-mentioned frame (also called the "front frame") are relatively weak, the locking component and / or the latch seat may be deformed at the least, or completely damaged and the opening and closing door may not be closed at the worst; second, the milk cart manufacturers may have problems with the locking component and / or the latch seat. After the production of the required number or a batch of milk carts is completed, they need to be transported to the destination through logistics. In this case, the aforementioned opening and closing door is usually rotated 180° and abutted against the rear side of the rear frame (also called "rear frame"), so that the milk cart is unfolded and takes the shape of ︹. In this shape, the required number of adjacent milk carts can be stacked one by one to save transportation space and reduce transportation costs. However, due to the lack of control measures on the opening and closing door during the process of rotating 180° and abutting against the rear frame, the opening and closing door will move or even be damaged; thirdly, when the car is full of milk or dairy products, it is difficult to push because it is uncomfortable to grip. Utility Model Content

[0004] The task of the utility model is to provide a milk cart with a structural improvement which helps to avoid damage to the opening and closing door caused by collision with adjacent vehicle bodies due to vehicle bumps in daily delivery performance, thereby playing a good role in protecting the opening and closing door, helps to prevent the opening and closing door from moving when it is rotated 180° and is in a state of being close to the outer side of the rear frame, thereby effectively protecting the opening and closing door in the empty vehicle stacking transportation link, and helps to provide a gripping reference for manually pushing the vehicle body, thereby embodying the effort-saving and comfort of pushing.

[0005] The task of the utility model is accomplished in this way: a milk cart with improved structure comprises a left frame, a front frame, a rear frame and an opening and closing door located between the right sides of the front and rear frames and corresponding to the left frame, the front frame left longitudinal tube of the front frame is hinged to the left frame front longitudinal tube of the left frame through the front frame left longitudinal tube hinge, the rear frame left longitudinal tube of the rear frame is hinged to the left frame rear longitudinal tube of the left frame through the rear frame left longitudinal tube hinge, a pair of opening and closing door latches are arranged at intervals on the opening and closing door front longitudinal tube on the front side of the opening and closing door, and a pair of opening and closing door latches are arranged on the right side of the front frame right longitudinal tube of the front frame A pair of latch seats are arranged at intervals at positions corresponding to the opening and closing door latches, and the opening and closing door latches are mated or unmated with the latch seats. The opening and closing door rear longitudinal tube of the opening and closing door is hinged to the rear frame right longitudinal tube of the rear frame through the opening and closing door rear longitudinal tube hinge, wherein a left frame front and rear longitudinal tube roller are respectively arranged at the bottom of the left frame front and rear longitudinal tubes, a front frame right longitudinal tube roller is arranged at the bottom of the front frame right longitudinal tube, a rear frame right longitudinal tube roller is arranged at the bottom of the rear frame right longitudinal tube, and a front frame is hinged from top to bottom on one side of the front frame facing the rear frame. A half-width mesh rack for storing items is provided on the left side of the left frame, and a half-width mesh rack for storing items is hingedly provided on the side of the rear frame facing the front frame and at a position corresponding to the half-width mesh rack for storing items. The front and rear half-width mesh racks together constitute a full-width mesh rack for storing items. A bottom rack that can be flipped upward to a vertical state or flipped downward to a horizontal state is hingedly provided on the left side of the lower part of the left frame, and is characterized in that a front anti-collision protrusion is provided on the right side surface of the right longitudinal tube of the front frame and a rear anti-collision protrusion is provided on the right side surface of the right longitudinal tube of the rear frame. The front and rear anti-collision protrusions The right end faces of the impact protrusions protrude out of the right side faces of the front longitudinal tubes of the opening and closing door when the opening and closing door is in a locked state with the right longitudinal tube of the front frame; an opening and closing door anti-movement limiting mechanism for limiting the opening and closing door to be close to the rear side of the rear frame when opened is fixed between the opposite sides of the lower parts of the left and right longitudinal tubes of the rear frame; a front frame right longitudinal tube gripping mechanism is provided at the upper end of the right longitudinal tube of the front frame, and a rear frame right longitudinal tube gripping mechanism is provided at the upper end of the right longitudinal tube of the rear frame and at a position corresponding to the front frame right longitudinal tube gripping mechanism.

[0006] In this embodiment, the front side of the front grille half-width storage mesh frame in the length direction is hinged between the opposite sides of the left longitudinal tube of the front frame and the right longitudinal tube of the front frame through a hinge pin, and the side of the front grille half-width storage mesh frame facing the rear grille half-width storage mesh frame is configured as a free end that is flipped upward to an upright state or flipped downward to a horizontal state; the rear side of the rear grille half-width storage mesh frame in the length direction is hinged between the opposite sides of the left longitudinal tube of the rear frame and the right longitudinal tube of the rear frame through a hinge pin, and the side of the rear grille half-width storage mesh frame facing the front grille half-width storage mesh frame is configured as a free end that is flipped upward to a vertical state or flipped downward to a horizontal state.

[0007] In this embodiment, the latch seat is hollow and has a latch locking tongue opening on the right side of the latch seat, and a latch locking tongue is formed at the lower end of the door latch, which cooperates with the latch locking tongue opening.

[0008] In this embodiment, the front anti-collision protrusion and the rear anti-collision protrusion are semicircular metal rings or rubber blocks, and when the front and rear anti-collision protrusions are the semicircular metal rings, they are respectively welded and fixed to the right side surface of the right longitudinal tube of the front frame and the right side surface of the right longitudinal tube of the rear frame by means of threads; and when the front and rear anti-collision protrusions are rubber blocks, the rubber blocks are respectively fixed to the right side surface of the right longitudinal tube of the front frame and the right side surface of the right longitudinal tube of the rear frame by means of fasteners or fixed by bonding with adhesives.

[0009] In this embodiment, the anti-movement limiting mechanism for the opening and closing door includes a reinforcement frame and a front longitudinal tube limiting component for the opening and closing door. The reinforcement frame is fixed between the opposite sides of the lower parts of the left longitudinal tube of the rear frame and the right longitudinal tube of the rear frame. The front longitudinal tube limiting component for the opening and closing door is fixed to the middle part of the reinforcement member in the length direction, and a front longitudinal tube limiting tongue for the opening and closing door is formed on the front longitudinal tube limiting component for the opening and closing door. When the opening and closing door rotates 180° counterclockwise and abuts against the rear side of the frame, after the opening and closing door is lifted and immediately released, the front longitudinal tube limiting tongue for the opening and closing door penetrates into the tube cavity of the front longitudinal tube of the opening and closing door to limit the opening and closing door.

[0010] In this embodiment, two ends of the reinforcing frame are folded to form a support bar, and the support bar is fixed to a crossbeam of the reinforcing frame.

[0011] In this embodiment, the longitudinal tube limiting member in front of the opening and closing door is fixed between the reinforcing frame and the cross beam.

[0012] In this embodiment, a punching hole is formed on the front longitudinal tube limiting member of the opening and closing door, and the material of the punching hole is transferred backward to form the front longitudinal tube limiting tongue of the opening and closing door.

[0013] In this embodiment, the structure of the right longitudinal tube gripping mechanism of the rear frame is the same as the structure of the right longitudinal tube gripping mechanism of the front frame.

[0014] In this embodiment, the gripping mechanism of the right longitudinal tube of the front frame includes a front shell flap and a rear shell flap. The front shell flap is embedded in the front side of the upper end of the right longitudinal tube of the front frame, and the rear shell flap is embedded in the rear side of the upper end of the right longitudinal tube of the front frame and corresponds to the front shell flap. The front and rear shell flaps are fixed by shell flap fixing screws. A front shell flap cavity is formed in the middle of the rear side of the front shell flap, and a rear shell flap cavity is formed in the middle of the front side of the rear shell flap. The sum of the depths of the front and rear shell flap cavities is adapted to the width of the right longitudinal tube of the front frame. A group of front shell flap finger matching concave cavities are formed on the left side of the front shell flap, and a group of rear shell flap finger matching concave cavities are formed on the left side of the rear shell flap. The front and rear shell flap finger matching concave cavities are connected to each other.

[0015] One of the technical effects of the technical solution provided by the utility model is that, since front and rear anti-collision protrusions are respectively arranged on the right side surfaces of the right longitudinal tube of the front frame and the right longitudinal tube of the rear frame, and the front and rear anti-collision protrusions protrude from the right side surface of the opening and closing door in the closed state, the opening and closing door, the opening and closing door latch and the latch seat can be effectively protected; secondly, since an anti-swaying limiting mechanism for the opening and closing door is arranged on the rear side of the rear frame, when the opening and closing door is unfolded to be in a state of being close to the rear side surface of the rear frame, the front longitudinal tube of the opening and closing door can be limited by the anti-swaying limiting mechanism for the opening and closing door, and no movement will occur; thirdly, since gripping mechanisms for the right longitudinal tubes of the front and rear frames are respectively arranged, a good position reference can be provided for gripping during manual pushing and the pushing effort and gripping comfort can be reflected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of an embodiment of the utility model;

[0017] Figure 2 for Figure 1 A magnified view of part A;

[0018] Figure 3 for Figure 1 The detailed structural diagram of the right longitudinal tube gripping mechanism of the front frame shown;

[0019] Figure 4 Depend on Figure 1 The schematic diagram shows that the front and rear frames, the opening and closing doors are in the unfolded state, and the front and rear grille half-width storage mesh frames and the bottom storage rack are in the flipped-up state. DETAILED DESCRIPTION

[0020] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description in the form of embodiments below. However, the description of the embodiments is not a limitation on the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical solution of the present invention.

[0021] In the following description, all concepts involving up, down, left, right, front and back are based on Figure 1 The current position state is used as a reference, and thus it cannot be understood as a special limitation on the technical solution provided by the utility model.

[0022] See also Figure 1 and Figure 2 , showing a left frame 1, a front frame 2, a rear frame 3 and a door opening and closing door 4 located between the right sides of the front and rear frames 2 and 3 and corresponding to the left frame 1, a front frame left longitudinal tube 21 of the front frame 2 is hinged to the left frame front longitudinal tube 11 of the left frame 1 through a front frame left longitudinal tube hinge 211 (three in this embodiment), a rear frame left longitudinal tube 31 of the rear frame 3 is hinged to the left frame rear longitudinal tube 12 of the left frame 1 through a rear frame left longitudinal tube hinge 311 (three in this embodiment), a pair of door opening and closing latches 411 are arranged at intervals on the door opening and closing door front longitudinal tube 41 on the front side of the door opening and closing door 4, a pair of latch seats 221 are arranged at intervals on the right side of the front frame right longitudinal tube 22 of the front frame 2 and at positions corresponding to the aforementioned door opening and closing latches 411, the door opening and closing latches 411 are mated or undocked with the latch seats 221, and the door opening and closing door rear longitudinal tube 42 of the door opening and closing door 4 is hinged to the door opening and closing door rear longitudinal tube 421 through the door opening and closing door rear longitudinal tube hinge 421 (A pair in this embodiment) is hinged to the rear frame right longitudinal tube 32 of the rear frame 3, wherein a left frame front and rear longitudinal tube rollers 111, 121 are respectively arranged at the bottom of the left frame front and rear longitudinal tubes 11, 12, a front frame right longitudinal tube roller 222 is arranged at the bottom of the front frame right longitudinal tube 22, and a rear frame right longitudinal tube roller 321 is arranged at the bottom of the rear frame right longitudinal tube 32, and a front grille half-width storage mesh rib frame 23 is hinged from top to bottom on the side of the front frame 2 facing the rear frame 3, and a rear grille half-width storage mesh rib frame 33 is hinged at a position corresponding to the front grille half-width storage mesh rib frame 23 on the side of the rear frame 3 facing the front frame 2, and the front and rear grille half-width storage mesh rib frames 23, 33 together constitute a full-width mesh rib storage rack, and a bottom storage rack 13 that is flipped upward to a vertical state or flipped downward to a horizontal state is hinged on the lower left side of the left frame 1.

[0023] As the technical highlights of the technical solution provided by the utility model: a front anti-collision protrusion 223 is arranged on the right side surface of the aforementioned front frame right longitudinal tube 22, and a rear anti-collision protrusion 322 is arranged on the right side surface of the aforementioned rear frame right longitudinal tube 32, and the right end surfaces of the front and rear anti-collision protrusions 223, 322 respectively protrude from the right side surface of the opening and closing door front longitudinal tube 41 of the aforementioned opening and closing door when it is in a locked state with the aforementioned front frame right longitudinal tube 22; an opening and closing door anti-movement limiting mechanism 5 for limiting the aforementioned opening and closing door 4 to be close to the rear side of the rear frame 3 when opened is fixed between the lower parts of the rear frame left and right longitudinal tubes 31, 32 of the aforementioned rear frame 3; a front frame right longitudinal tube gripping mechanism 6 is arranged at the upper end of the aforementioned front frame right longitudinal tube 22, and a rear frame right longitudinal tube gripping mechanism 7 is arranged at the upper end of the rear frame right longitudinal tube 32 and at a position corresponding to the front frame right longitudinal tube gripping mechanism 6.

[0024] In this embodiment, the aforementioned front anti-collision protrusions 223 have a pair, but are not limited to a pair, and the aforementioned rear anti-collision protrusions 322 have one but can also be a pair, so the number of front and rear anti-collision protrusions 223 and 322 is not limited by this embodiment.

[0025] See you next time Figure 1 and Figure 2 The front side of the front grille half-width storage mesh frame 23 in the length direction is hinged between the opposite sides of the front frame left longitudinal tube 21 and the front frame right longitudinal tube 22 through a hinge pin, and the side of the front grille half-width storage mesh frame 23 facing the rear grille half-width storage mesh frame 33 is configured as a free end that is flipped upward to an upright state or flipped downward to a horizontal state; the rear side of the rear grille half-width storage mesh frame 33 in the length direction is hinged between the opposite sides of the rear frame left longitudinal tube 31 and the rear frame right longitudinal tube 32 through a hinge pin, and the side of the rear grille half-width storage mesh frame 33 facing the front grille half-width storage mesh frame 23 is configured as a free end that is flipped upward to a vertical state or flipped downward to a horizontal state.

[0026] The latch seat 221 is hollow and has a latch locking tongue opening 2211 ( Figure 2 As shown in the figure, a latch locking tongue 4111 is formed at the lower end of the aforementioned door latch 411, and the latch locking tongue 4111 cooperates with the latch locking tongue opening 2211.

[0027] In this embodiment, the front anti-collision protrusion 223 and the rear anti-collision protrusion 322 are semicircular metal rings, but rubber blocks can also be used. Since the front and rear anti-collision protrusions 223 and 322 of this embodiment are semicircular metal rings, they are respectively welded and fixed to the right side surface of the front frame right longitudinal tube 22 and the right side surface of the rear frame right longitudinal tube 32, but they can also be fixed by screwing. If the front and rear anti-collision protrusions 223 and 322 are rubber blocks, the rubber blocks are respectively fixed to the right side surface of the front frame right longitudinal tube 22 and the right side surface of the rear frame right longitudinal tube 32 by means of fasteners such as screws or fixed by adhesive.

[0028] Please see the key Figure 1 The aforementioned anti-movement limiting mechanism 5 for the opening and closing door includes a reinforcing frame 51 and a front longitudinal tube limiting member 52 for the opening and closing door. The reinforcing frame 51 is fixed between the lower parts of the left longitudinal tube 31 and the right longitudinal tube 32 of the aforementioned rear frame facing each other. The front longitudinal tube limiting member 52 for the opening and closing door is fixed to the middle part of the reinforcing member 51 in the length direction, and a front longitudinal tube limiting tongue 521 for the opening and closing door is formed on the front longitudinal tube limiting member 52 for the opening and closing door. When the aforementioned opening and closing door 4 rotates 180° counterclockwise and abuts against the rear side of the aforementioned frame 3 ( Figure 4 As shown in the state), after lifting and releasing, that is, first lifting it upward and then immediately lowering the opening and closing door 4, the aforementioned opening and closing door front longitudinal tube limiting tongue 521 penetrates into the tube cavity of the opening and closing door front longitudinal tube 41 to limit the opening and closing door 4.

[0029] Preferably, at both ends of the aforementioned reinforcement frame 51, a support bar 511 is folded and unfolded to form a support bar 511, and the support bar 511 is fixed to a crossbeam 512 of the reinforcement frame 51. Figure 1 As shown, the aforementioned reinforcing frame 51 and the cross beam 512 are fixed between the lower sides of the left and right longitudinal tubes 31 and 32 of the rear frame 3 facing each other.

[0030] Depend on Figure 1 As shown, the aforementioned opening and closing door front longitudinal pipe limiting member 52 is fixed between the reinforcing frame 51 and the aforementioned cross beam 512. A punching hole 522 is formed on the aforementioned opening and closing door front longitudinal pipe limiting member 52, and the material of the punching hole 522 is transferred backward to form the aforementioned opening and closing door front longitudinal pipe limiting tongue 521.

[0031] Please see the key Figure 3In this embodiment, since the structure of the rear frame right longitudinal tube gripping mechanism 7 is the same as that of the front frame right longitudinal tube gripping mechanism 6, the applicant will only describe the front frame right longitudinal tube gripping mechanism 6 in detail below. The front frame right longitudinal tube gripping mechanism 6 includes a front shell flap 61 and a rear shell flap 62. The front shell flap 61 is embedded in the front end of the front frame right longitudinal tube 22, and the rear shell flap 62 is embedded in the rear end of the front frame right longitudinal tube 22 and corresponds to the front shell flap 61. The front and rear shell flaps 61 and 62 are connected by a shell. The flap is fixed by a flap fixing screw 63, a front flap cavity 611 is formed in the middle of the rear side of the front flap 61, and a rear flap cavity 621 is formed in the middle of the front side of the rear flap 62. The sum of the depths of the front and rear flap cavities 611, 621 is adapted to the width of the right longitudinal tube 22 of the front frame. A group of front flap finger-matching concave cavities 612 is formed on the left side of the front flap 61, and a group of rear flap finger-matching concave cavities 622 is formed on the left side of the rear flap 62. The front and rear flap finger-matching concave cavities 612, 622 are connected to each other.

[0032] See also Figure 4 , because relative to Figure 1 In terms of usage status, Figure 4 In the unfolded state, the front and rear frames 2 and 3 form a ︹ state relative to the left frame 1, and the front and rear grille half-width storage mesh rib frames 23 and 33 are formed by Figure 1 The horizontal position (can be used to place milk or dairy products) is turned upward by 90° to present Figure 4 The vertical state shown in the figure, and the opening and closing door 4 is against the rear side of the rear frame 3 and is limited by the aforementioned opening and closing door anti-movement limiting mechanism 5, specifically, the opening and closing door front longitudinal tube limiting tongue 521 is located in the tube cavity at the lower end of the opening and closing door front longitudinal tube 41.

[0033] exist Figure 4 In this state, the required number of milk trucks can be stacked one by one for transportation in the logistics link, so as to save space and reduce transportation costs. The above form can also put empty trucks in a storage state.

[0034] In summary, the technical solution provided by the utility model makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. A milk cart with improved structure, comprising a left frame (1), a front frame (2), a rear frame (3) and an opening and closing door (4) located between the right sides of the front and rear frames (2, 3) and corresponding to the left frame (1); a front frame left longitudinal tube (21) of the front frame (2) is hinged to a left frame front longitudinal tube (11) of the left frame (1) through a front frame left longitudinal tube hinge (211); a rear frame left longitudinal tube (31) of the rear frame (3) is hinged to a left frame rear longitudinal tube (12) of the left frame (1) through a rear frame left longitudinal tube hinge (311); A pair of door latches (411) are arranged at intervals on the front longitudinal tube (41) of the door on the front side of the door (4); a pair of latch seats (221) are arranged at intervals on the right side of the front frame right longitudinal tube (22) of the front frame (2) and at positions corresponding to the door latches (411); the door latches (411) and the latch seats (221) are mated or unmated; the door rear longitudinal tube (42) of the door (4) is hinged to the rear frame right longitudinal tube (32) of the rear frame (3) through the door rear longitudinal tube hinge (421); wherein: A left frame front and rear longitudinal tube roller (111, 121) is respectively arranged at the bottom of the left frame front and rear longitudinal tubes (11, 12), a front frame right longitudinal tube roller (222) is arranged at the bottom of the front frame right longitudinal tube (22), and a rear frame right longitudinal tube roller (321) is arranged at the bottom of the rear frame right longitudinal tube (32). A front grille half-width storage mesh rib frame (23) is hingedly arranged from top to bottom on the side of the front frame (2) facing the rear frame (3), and a rear grille half-width storage mesh rib frame (33) is hingedly arranged on the side of the rear frame (3) facing the front frame (2) and at a position corresponding to the front grille half-width storage mesh rib frame (23). The front and rear grille half-width storage mesh rib frames (23, 33) together constitute a full-width mesh rib storage rack. A bottom storage rack (13) that can be flipped upward to a vertical state or flipped downward to a horizontal state is hingedly arranged on the lower left side of the left frame (1), characterized in that: A front anti-collision protrusion (223) is arranged on the right side surface of the right longitudinal tube (22) of the front frame, and a rear anti-collision protrusion (322) is arranged on the right side surface of the right longitudinal tube (32) of the rear frame, and the right end surfaces of the front and rear anti-collision protrusions (223, 322) respectively protrude from the right side surface of the front longitudinal tube (41) of the opening and closing door when the opening and closing door is in a locked state with the right longitudinal tube (22) of the front frame; an opening and closing door anti-movement limiting mechanism (5) is fixed between the lower parts of the left and right longitudinal tubes (31, 32) of the rear frame (3) on the opposite sides thereof, for limiting the opening and closing door (4) to be close to the rear side of the rear frame (3) when opened; a front frame right longitudinal tube gripping mechanism (6) is arranged at the upper end of the right longitudinal tube (22) of the front frame, and a rear frame right longitudinal tube gripping mechanism (7) is arranged at the upper end of the right longitudinal tube (32) of the rear frame and at a position corresponding to the front frame right longitudinal tube gripping mechanism (6).

2. The structurally improved milk cart according to claim 1, characterized in that: The front side of the front grille half-width storage mesh frame (23) in the length direction is hinged between the opposite sides of the left longitudinal tube (21) of the front frame and the right longitudinal tube (22) of the front frame through a hinge pin, and the side of the front grille half-width storage mesh frame (23) facing the rear grille half-width storage mesh frame (33) is configured as a free end that is flipped upward to an upright state or flipped downward to a horizontal state; the rear side of the rear grille half-width storage mesh frame (33) in the length direction is hinged between the opposite sides of the left longitudinal tube (31) of the rear frame and the right longitudinal tube (32) of the rear frame through a hinge pin, and the side of the rear grille half-width storage mesh frame (33) facing the front grille half-width storage mesh frame (23) is configured as a free end that is flipped upward to a vertical state or flipped downward to a horizontal state.

3. The structurally improved milk cart according to claim 1, characterized in that: The latch seat (221) is hollow and has a latch locking tongue opening (2211) formed on the right side of the latch seat (221), and a latch locking tongue (4111) is formed at the lower end of the door latch (411), and the latch locking tongue (4111) matches the latch locking tongue opening (2211).

4. The structurally improved milk cart according to claim 1, characterized in that: The front anti-collision protrusion (223) and the rear anti-collision protrusion (322) are semicircular metal rings or rubber blocks, and when the front and rear anti-collision protrusions (223, 322) are the semicircular metal rings, they are respectively welded and fixed to the right side surface of the right longitudinal tube (22) of the front frame and the right side surface of the right longitudinal tube (32) of the rear frame by means of threads; and when the front and rear anti-collision protrusions (223, 322) are rubber blocks, the rubber blocks are respectively fixed to the right side surface of the right longitudinal tube (22) of the front frame and the right side surface of the right longitudinal tube (32) of the rear frame by means of fasteners or fixed by adhesive.

5. The structurally improved milk cart according to claim 1, characterized in that: The anti-movement limiting mechanism (5) for the opening and closing door comprises a reinforcing frame (51) and a front longitudinal tube limiting member (52) for the opening and closing door. The reinforcing frame (51) is fixed between the lower parts of the left longitudinal tube (31) and the right longitudinal tube (32) of the rear frame facing each other. The front longitudinal tube limiting member (52) for the opening and closing door is fixed to the middle part of the reinforcing frame (51) in the length direction. A front longitudinal tube limiting tongue (521) for the opening and closing door is formed on the front longitudinal tube limiting member (52). When the opening and closing door (4) rotates 180° counterclockwise and abuts against the rear side of the frame (3), after the opening and closing door (4) is lifted and immediately released, the front longitudinal tube limiting tongue (521) for the opening and closing door penetrates into the tube cavity of the front longitudinal tube (41) for the opening and closing door to limit the opening and closing door (4).

6. The structurally improved milk cart according to claim 5, characterized in that: Two ends of the reinforcing frame (51) are folded to form a support bar (511), and the support bar (511) is fixed to a crossbeam (512) of the reinforcing frame (51).

7. The structurally improved milk cart according to claim 6, characterized in that: The opening and closing door front longitudinal pipe limiting member (52) is fixed between the reinforcing frame (51) and the crossbeam (512).

8. The structurally improved milk cart according to claim 5, characterized in that: A punching hole (522) is formed on the opening and closing door front longitudinal tube limiting member (52), and the material at the punching hole (522) is transferred backward to form the opening and closing door front longitudinal tube limiting tongue (521).

9. The structurally improved milk cart according to claim 1, characterized in that: The structure of the right longitudinal tube gripping mechanism (7) of the rear frame is the same as the structure of the right longitudinal tube gripping mechanism (6) of the front frame.

10. The structurally improved milk cart according to claim 9, characterized in that: The front frame right longitudinal tube gripping mechanism (6) comprises a front shell flap (61) and a rear shell flap (62), the front shell flap (61) is embedded in the front side of the upper end of the front frame right longitudinal tube (22), the rear shell flap (62) is embedded in the rear side of the upper end of the front frame right longitudinal tube (22) and corresponds to the front shell flap (61), the front and rear shell flaps (61, 62) are fixed by shell flap fixing screws (63), a front shell flap cavity (611) is formed in the middle of the rear side of the front shell flap (61), and a rear shell flap cavity (611) is formed in the middle of the rear side of the front shell flap (61). A rear shell flap cavity (621) is formed in the front middle part of the rear shell flap (62), and the sum of the depths of the front and rear shell flap cavities (611, 621) is adapted to the width of the right longitudinal tube (22) of the front frame. A group of front shell flap finger matching concave cavities (612) is formed on the left side of the front shell flap (61), and a group of rear shell flap finger matching concave cavities (622) is formed on the left side of the rear shell flap (62), and the front and rear shell flap finger matching concave cavities (612, 622) are connected to each other.

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