Front frame cooperating structure with a milk truck

Abstract

A front frame and a taking door cooperation structure of a milk car belongs to the technical field of commercial facilities. It comprises a front frame and a taking door. The front frame comprises a front frame left and right longitudinal beam and a front frame storage grid shelf front end support cross beam. The front frame left longitudinal beam and the front frame right longitudinal beam are parallel to each other in the left and right longitudinal directions. The space between each of the upper and lower two adjacent front frame storage grid shelf front end support cross beams is a taking cavity opening. The taking door is arranged between the opposite sides of the front frame left and right longitudinal beams in the height direction. The taking door is in sliding connection with the front frame left and right longitudinal beams. When the taking door is pulled up by a person, the taking door removes the obstruction of the taking cavity opening. When the taking door returns, the taking door restores the obstruction of the taking cavity opening. Advantage: When a customer selects and purchases packaged milk, the customer only needs to pull up the taking door. The front frame does not need to be opened in an arc spreading state. The space occupation of the supermarket passage when the door is opened to take the goods is eliminated.

Description

Technical Field

[0001] This invention belongs to the field of commercial facility technology, specifically relating to a front frame and retrieval door structure for a milk cart. Background Technology

[0002] The milk carts mentioned above are primarily used by milk and dairy product manufacturers as a means of transportation for selling and / or distributing milk to supermarkets, shopping malls, restaurants, or similar commercial establishments. However, they are mainly deployed directly to provide customers with convenient access to milk, not limited to the aforementioned consumer locations. The front frame of the aforementioned milk cart refers to the frame facing outwards, i.e., towards the customer, when the milk cart is in its normal product display state. This is because the milk cart consists of four openwork frames: front, rear, left, and right. For details, please refer to CN100554059C (Milk Cart).

[0003] As is known in the industry, when the hinged side (i.e. the side in the height direction, the same below) of the front frame of the milk cart is hinged to the right frame, then the free side of the front frame (i.e. the other side in the height direction, the same below) can be opened or closed relative to the left frame (i.e., open or close the door); conversely, when the hinged side of the front frame is hinged to the left frame, then the free side of the front frame can be opened or closed relative to the right frame (i.e., open or close the door). As is well known in the industry, the width of the aisles in self-service supermarkets and shopping malls is very limited. In other words, to display as many products as possible, redundant space in supermarkets and shopping malls is extremely limited and precious. Therefore, when customers select bottled or boxed milk (collectively referred to as "dairy products") from milk carts, the current method of retrieving the goods involves opening the front frame of the milk cart (e.g., the front frame described in CN100554059C). However, opening the front frame occupies the entire aisle, interfering with the normal passage of other customers during the retrieval period. Although the retrieval time is very short, there is still a negative interference factor, and shoppers themselves must even move along with the front frame to avoid it. If the aisles in the shopping mall's display area were widened to avoid affecting the smooth passage of other customers during milk selection, this would lead to a trade-off: increasing the space occupied in the product display area and affecting the number of products that can be displayed. Some might argue that simply placing bottled and / or boxed milk on supermarket shelves would naturally solve the aforementioned problems. However, milk, especially fresh milk, is highly sensitive to hygiene and environmental conditions (such as temperature), and the frequency of handling must be minimized. Furthermore, bottled or boxed milk is highly susceptible to damage if it falls from the shelf, potentially causing environmental harm and product loss. Additionally, unsold fresh milk typically needs to be transported by milk truck to a specific refrigerated environment to prevent spoilage within a reasonable or prescribed shelf life. Summary of the Invention

[0004] The objective of this invention is to provide a front frame and retrieval door structure for milk carts that allows customers to retrieve packaged milk without opening the front frame, thereby eliminating space occupation in supermarket aisles and avoiding interference with the passage of other customers.

[0005] The objective of this invention is achieved as follows: a front frame and retrieval door cooperation structure for a milk cart includes a front frame and a retrieval door. The front frame includes a left longitudinal beam, a right longitudinal beam, and a front frame storage grille shelf front support beam. The left and right longitudinal beams are parallel to each other longitudinally. There is a set of front frame storage grille shelf front support beams, which are fixed at intervals between opposite sides of the left and right longitudinal beams. The space between two adjacent front frame storage grille shelf front support beams forms a retrieval cavity. The retrieval door is located between opposite sides of the left and right longitudinal beams in the height direction. The retrieval door slides vertically with the left and right longitudinal beams of the front frame to form a sliding pair. When the retrieval door is pulled upward, it releases the obstruction of the retrieval cavity, and when the retrieval door is pulled downward, it restores the obstruction of the retrieval cavity.

[0006] In a specific embodiment of the present invention, a front frame longitudinal beam connecting crossbar is connected between the opposing sides of the left longitudinal beam and the right longitudinal beam of the front frame and at a position corresponding to the front of the front support crossbar of each front frame storage grid shelf. The space between the front frame longitudinal beam connecting crossbar and the front support crossbar of the front frame storage grid shelf forms a lifting crossbar cavity. The retrieval door forms a sliding pair with the opposing sides of the left and right longitudinal beams of the front frame at a position corresponding to the lifting crossbar cavity.

[0007] In another specific embodiment of the present invention, a left lifting rod sliding guide groove is formed on the side of the left longitudinal beam of the front frame facing the right longitudinal beam of the front frame and along the height direction of the left longitudinal beam of the front frame, and a right lifting rod sliding guide groove is formed on the side of the right longitudinal beam of the front frame facing the left longitudinal beam and along the height direction of the right longitudinal beam of the front frame; the left end of the connecting crossbar of the front longitudinal beam is fixed to the left longitudinal beam of the front frame at a position corresponding to the left lifting rod sliding guide groove, and the right end is fixed to the right longitudinal beam of the front frame at a position corresponding to the right lifting rod sliding guide groove; the left end of the front end support crossbeam of the front shelf of the front frame is fixed to the left longitudinal beam of the front frame at a position corresponding to the left lifting rod sliding guide groove, and the right end is fixed to the right longitudinal beam of the front frame at a position corresponding to the right lifting rod sliding guide groove; the retrieval door, the left lifting rod sliding guide groove, and the right lifting rod sliding guide groove form a sliding pair.

[0008] In another specific embodiment of the present invention, the retrieval door includes a left lifting rod, a right lifting rod, and a set of retrieval cavity blocking crossbars. The left lifting rod and the left lifting rod sliding guide groove form a sliding pair that slides up and down, and the right lifting rod and the right lifting rod sliding guide groove form a sliding pair that slides up and down. The set of retrieval cavity blocking crossbars are connected from top to bottom between the left and right lifting rods at positions corresponding to the lifting crossbar cavity. The spacing between each pair of adjacent upper and lower retrieval cavity blocking crossbars is adapted to the spacing between the upper and lower adjacent front frame longitudinal beam connecting crossbars. In the set of retrieval cavity blocking crossbars, the top retrieval cavity blocking crossbar is configured as a handle crossbar. The left end of the handle crossbar is connected to the top of the left lifting rod, and the right end is connected to the top of the right lifting rod.

[0009] In another specific embodiment of the present invention, a left lifting rod support column is fixed at the lower part of the left lifting rod sliding guide groove, and a right lifting rod support column is fixed at the lower part of the right lifting rod sliding guide groove and at a position corresponding to the left lifting rod support column. When the set of object retrieval cavity blocking crossbars are in the state of blocking the object retrieval cavity, the bottom surface of the left lifting rod is supported on the left lifting rod support column, and at the same time, the bottom surface of the right lifting rod is supported on the right lifting rod support column.

[0010] In another specific embodiment of the present invention, in the set of retrieval cavity blocking crossbars, a crossbar support elastic deformation support plate is fixed at the rear side of the middle part of the first front frame longitudinal beam connecting crossbar located below the handle crossbar in the length direction. When the set of retrieval cavity blocking crossbars are released from blocking the retrieval cavity, the first front frame longitudinal beam connecting crossbar located below the handle crossbar is supported on the crossbar support elastic deformation support plate.

[0011] In a further specific embodiment of the present invention, the cross-sectional shape of the left lifting rod and the right lifting rod is circular, and the cross-sectional shape of the sliding guide groove of the left lifting rod and the sliding guide groove of the right lifting rod is semi-circular.

[0012] In a further specific embodiment of the present invention, front frame left longitudinal beam hinges are provided at intervals on the rear side of the front frame left longitudinal beam and along the height direction of the front frame left longitudinal beam, and front frame right longitudinal beam hinges are provided at intervals on the rear side of the front frame right longitudinal beam and along the height direction of the front frame right longitudinal beam.

[0013] The technical effect of the solution provided by the present invention is as follows: Since a retrieval door is provided between the opposite sides of the left and right longitudinal beams of the front frame, forming a sliding pair with the left and right longitudinal beams, when customers select packaged milk, they only need to pull the retrieval door upwards, without having to open the front frame in an arc-shaped unfolded state. This can eliminate the space occupation of supermarket aisles when opening the door to retrieve items, and also avoid interfering with the passage of other customers passing through. Attached Figure Description

[0014] Figure 1 This is a structural diagram of an embodiment of the present invention.

[0015] Figure 2 for Figure 1 A schematic diagram illustrating an application example of the structure.

[0016] Figure 3 for Figure 2 Enlarged view of part A.

[0017] Figure 4 for Figure 2 Enlarged view of part B.

[0018] Figure 5 for Figure 2 Enlarged view of part C.

[0019] Figure 6 for Figure 1 and Figure 2 The diagram shows the retrieval door in a state where it is pulled upwards, causing a set of handle bars to release their obstruction of the retrieval cavity opening.

[0020] Figure 7 for Figure 2 The diagram shows a detailed structural diagram of the pivot locking mechanism for the right-side storage grid shelf fixing beam.

[0021] Figure 8 for Figure 2 The diagram shown is a schematic of the rear frame front trailing arm locking mechanism in the locked state of the rear frame front trailing arm.

[0022] Figure 9 for Figure 2 The diagram shown illustrates the rear frame front trailing arm locking mechanism in the deployed state, where the front trailing arm of the rear frame is unlocked. Detailed Implementation

[0023] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0024] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 1 and Figure 2 The current position is used as an example and therefore should not be construed as a specific limitation on the technical solution provided by this invention.

[0025] Please see Figure 1 The diagram shows a front frame 1 and a retrieval door 6. The front frame 1 includes a left longitudinal beam 11, a right longitudinal beam 12, and a front frame storage grid shelf front support beam 13. The left longitudinal beam 11 and the right longitudinal beam 12 are parallel to each other longitudinally. There is one set of front frame storage grid shelf front support beams 13, which are fixed at intervals between the opposite sides of the left and right longitudinal beams 11 and 12. The front ends of each pair of adjacent front frame storage grid shelves are... The space between the supporting beams 13 forms a retrieval cavity 131. The retrieval door 6 is located between the left longitudinal beam 11 and the right longitudinal beam 12 of the front frame on opposite sides in the height direction. The retrieval door 6 slides up and down to form a sliding pair with the left longitudinal beam 11 and the right longitudinal beam 12 of the front frame. When the retrieval door 6 is pulled up, it releases the obstruction of the retrieval cavity 131. When the retrieval door 6 returns down, it restores the obstruction of the retrieval cavity 131.

[0026] Please see Figure 2 And combined Figure 1 ,exist Figure 2In addition to the front frame 1 mentioned above, a rear frame 2, a left frame 3, a right frame 4 and a bottom frame 5 are also shown. The front frame 1 includes a front frame left longitudinal beam 11 and a front frame right longitudinal beam 12. On the rear side of the front frame left longitudinal beam 11 and at intervals from top to bottom along the height direction of the front frame left longitudinal beam 11, there are front frame left longitudinal beam hinges 111 (three in this embodiment, but not limited to three, the same applies hereinafter). The front frame left longitudinal beam hinge 111 is hinged to the front side of the front longitudinal arm 31 of the left frame 3. On the rear side of the front frame right longitudinal beam 12 and at intervals from top to bottom along the height direction of the front frame right longitudinal beam 12, there are front frame right longitudinal beam hinges 121 (three in this embodiment). The front frame right longitudinal beam hinge 121 is hinged to the front side of the front longitudinal arm 41 of the right frame 4. The rear side in the height direction of the rear longitudinal arm 21 of the rear frame 2 is hinged to the rear side of the rear longitudinal arm 32 of the left frame 3 through a set of rear frame rear longitudinal arm hinges 211 (three in this embodiment) distributed at intervals from top to bottom. Between the front and rear longitudinal arms 31 and 32 of the left frame, there are left frame longitudinal arm blocking rods 33 connected at intervals from top to bottom. Due to the function of the left frame longitudinal arm blocking rods 33, the shape of the left frame 3 is in a structure like a Chinese character 'Mu'. Here, the so-called structure like a Chinese character 'Mu' does not refer to the true shape of the Chinese character 'Mu', but is a term used to vividly express the structure. For example, it can also be called a plurality of repeatedly circular structures like the Chinese character 'Mu', or expressed as the upper and lower ends are connected by a horizontal bar, and in the middle, the number of the aforementioned left frame longitudinal arm blocking rods 33 is set at intervals without special limitation. The same applies to the rear and right frames 2 and 4, which will not be elaborated here. The front longitudinal arm 22 of the rear frame 2 is locked or unlocked with the rear longitudinal arm 42 of the right frame 4 through a rear frame front longitudinal arm locking mechanism 7 at a position corresponding to the rear side in the height direction of the rear longitudinal arm 42 of the right frame 4. Between the front and rear longitudinal arms 22 and 21 of the rear frame, there are rear frame longitudinal arm blocking rods 23 connected at intervals from top to bottom. Due to the rear frame longitudinal arm blocking rods 23, the shape of the rear frame 2 is in a structure like a Chinese character 'Mu'. As a preferred solution, a hollow rear frame upper blocking grid plate 24 can also be fixed between the front and rear longitudinal arms 22 and 21 at the upper part of the rear frame 2. The front end of the bottom frame 5 is connected to the opposite side of the lower ends of the aforementioned front frame left longitudinal beam 11 and front frame right longitudinal beam 12. The rear end of the bottom frame 5 is configured as a free end that can be turned upwards to lean against the rear side of the front frame 1 or turned downwards to a horizontal state. And at the left end of the bottom frame cross beam 53 at the front end of the bottom frame 5, there is a bottom frame left traveling wheel 51, and at the right end of the bottom frame cross beam 53, there is a bottom frame right traveling wheel 52. The bottom frame left traveling wheel 51 corresponds to the front of the left frame traveling wheel 34 provided at the bottom rear end of the left frame 3, and the bottom frame right traveling wheel 52 corresponds to the front of the right frame traveling wheel 43 provided at the bottom rear end of the right frame 4; By Figure 2 , Figure 6 and Figure 9As shown, the aforementioned left travel wheel 51 of the bottom frame is rotatably mounted on the left travel wheel seat 511 of the bottom frame via the left travel wheel axle. The left travel wheel seat 511 of the bottom frame is welded and fixed to the left end of the bottom frame crossbeam 53. The aforementioned right travel wheel 52 of the bottom frame is rotatably mounted on the right travel wheel seat 521 of the bottom frame via the right travel wheel axle. The right travel wheel seat 521 of the bottom frame is welded and fixed to the right end of the bottom frame crossbeam 53. Furthermore, the left side of the left travel wheel seat 511 of the bottom frame is welded and fixed to the lower right side of the aforementioned left longitudinal beam 11 of the front frame. The right side of seat 521 is welded and fixed to the lower left side of the aforementioned right longitudinal beam 12 of the front frame. The front end of the bottom frame 5, i.e., the front end of the grid-like area (also called the grille-like area) of the bottom frame 5, is hinged to the opposite sides of the left and right wheel seats 511 and 521 of the bottom frame respectively through a pair of bottom frame hinge pins 55. The rear end of the bottom frame 5, i.e., the rear end of the grid-like area (also called the grille-like area) of the bottom frame 5, is configured as a free end that can both flip upwards and return downwards (i.e., return). On the opposite sides of the aforementioned left and right longitudinal beams 11 and 12 of the front frame... Along the height direction of the left and right longitudinal beams 11 and 12 of the front frame, front frame storage grid shelf front support beams 13 are connected at intervals from top to bottom. The space between each pair of adjacent front frame storage grid shelf front support beams 13 forms a retrieval cavity 131. Between the opposing sides of the left frame front and rear longitudinal arms 31 and 32 of the aforementioned left frame 3, and along the height direction of the left frame front and rear longitudinal arms 31 and 32, left storage grid shelf fixing beams 35 are pivotally placed at intervals from top to bottom. Corresponding to the left storage grid shelf fixing beams 35 A left storage grid shelf 351 is provided on the right side of the length direction. The left side of the left storage grid shelf 351 is fixed to the right side of the left storage grid shelf fixing beam 35. The right side of the left storage grid shelf 351 is configured to flip upward until it is in contact with the left side of the left frame 3 or flip downward to a horizontal state. When it is flipped downward to a horizontal state, the front end of the left storage grid shelf 351 is supported on the upward-facing side of the left end of the aforementioned front frame storage grid shelf front support beam 13.A right storage grid shelf fixing beam 44 is pivotally mounted between the opposing sides of the front and rear longitudinal arms 41 and 42 of the right frame 4, and at intervals from top to bottom along the height direction of the front and rear longitudinal arms 41 and 42. The position of the right storage grid shelf fixing beam 44 corresponds to the aforementioned left storage grid shelf fixing beam 35. A right storage grid shelf 441 is provided on the left side of the right storage grid shelf fixing beam 44 along its length direction. The right side of the right storage grid shelf 441 along its length direction is fixed to the left side of the right storage grid shelf fixing beam 44. The left side of the right storage grid shelf 441 along its length direction is configured to flip upwards until it is in contact with the right side of the right frame 4 or flip downwards to a horizontal state. When flipped downwards to a horizontal state, the front end of the right storage grid shelf 441 is supported on the upward-facing right end of the aforementioned front frame storage grid shelf front end support beam 13.

[0027] Depend on Figure 9 As shown, a limiting hook 413 is fixed at the bottom of the front longitudinal beam 41 of the right frame 4. A limiting hook head 4131 is formed at the end of the limiting hook 413. In return, a hook head mating hole 54 is provided on the bottom frame 5 (also called a "bottom shelf," as described above) at a position corresponding to the limiting hook 413. When the limiting hook head 4131 of the limiting hook 413 is engaged with the hook head mating hole 54, the front longitudinal arm 41 of the right frame 4 is in a locked state, i.e., the front longitudinal arm 41 of the right frame is in a locked state. Figure 2 As shown, with the engagement (connection) of the right longitudinal arm 12 of the front frame, the right frame 4 cannot be unfolded into... Figure 9 The state shown is the same as the reverse.

[0028] Please see Figure 3 And combined Figure 1 and Figure 2 Between the opposing sides of the aforementioned left longitudinal beam 11 and the aforementioned right longitudinal beam 12 of the front frame, and in front of the front support beam 13 corresponding to the aforementioned front frame storage grid shelf, a front frame longitudinal beam connecting crossbar 14 is connected. The space between the front frame longitudinal beam connecting crossbar 14 and the front support beam 13 of the front frame storage grid shelf is configured as a lifting crossbar cavity 141. Figure 1 and Figure 3 (Illustrated), the aforementioned retrieval door 6 forms a sliding pair with the opposing side of the aforementioned left longitudinal beam 11 and right longitudinal beam 12 of the front frame at the position corresponding to the lifting crossbar cavity 141.

[0029] A left lifting rod sliding guide groove 112 is formed on the side of the aforementioned left longitudinal beam 11 facing the aforementioned right longitudinal beam 12 of the front frame and along the height direction of the left longitudinal beam 11 of the front frame; and a right lifting rod sliding guide groove 122 is formed on the side of the aforementioned right longitudinal beam 12 facing the aforementioned left longitudinal beam 11 of the front frame and along the height direction of the right longitudinal beam 12 of the front frame; the left end of the aforementioned front frame longitudinal beam connecting crossbar 14 is fixed to the aforementioned left longitudinal beam 11 of the front frame at a position corresponding to the left lifting rod sliding guide groove 112. The right end is fixed to the right longitudinal beam 12 of the front frame at the position corresponding to the right lifting rod sliding guide groove 122; the left end of the front support beam 13 of the aforementioned front frame storage grid shelf is fixed to the left longitudinal beam 11 of the aforementioned front frame at the position corresponding to the left lifting rod sliding guide groove 112, while the right end is fixed to the right longitudinal beam 12 of the front frame at the position corresponding to the right lifting rod sliding guide groove 122; the aforementioned retrieval door 6, the aforementioned left lifting rod sliding guide groove 112, and the right lifting rod sliding guide groove 122 constitute a sliding pair.

[0030] See you later Figure 1 and Figure 2 The aforementioned retrieval door 6 includes a left lifting rod 61, a right lifting rod 62, and a set of retrieval cavity opening blocking crossbars 63. The left lifting rod 61 and the aforementioned left lifting rod sliding guide groove 112 form a sliding pair that slides up and down, and the right lifting rod 62 and the aforementioned right lifting rod sliding guide groove 122 form a sliding pair that slides up and down. A set of retrieval cavity opening blocking crossbars 63 are connected from top to bottom between the left and right lifting rods 61 and 62 at positions corresponding to the aforementioned lifting crossbar cavity 141. Furthermore, the spacing between each pair of adjacent upper and lower retrieval cavity blocking crossbars 63 is adapted to the spacing between the aforementioned upper and lower adjacent front frame longitudinal beam connecting crossbars 14, and more specifically, is substantially equal. In a set of retrieval cavity blocking crossbars 63, the top retrieval cavity blocking crossbar 63 is configured as a handle crossbar 631, the left end of which is connected to the top of the left lifting rod 61, and the right end is connected to the top of the right lifting rod 62.

[0031] Depend on Figure 2 As shown, since the retrieval door 6 is in a non-retrieval state at this time, the aforementioned handle bar 631 and a set of retrieval cavity opening blocking bars 63 are in a blocking state against the retrieval cavity opening 131 to prevent items such as bottled or boxed milk from falling out. Therefore, the retrieval door 6 has a dual function: it acts as a blocker when not opening upwards (pulling up), and when pulled upwards to retrieve items (such as bottled or boxed milk), it is a retrieval door that can be opened in two ways. Figure 6 When the state shown is reached, it can ensure that the object can be retrieved smoothly without interference.

[0032] Please see you again. Figure 2A left lifting rod support column 1121 is fixed at the lower part of the aforementioned left lifting rod sliding guide groove 112, and a right lifting rod support column 1221 is fixed at the lower part of the aforementioned right lifting rod sliding guide groove 122 and at a position corresponding to the left lifting rod support column 1121. When the aforementioned set of object retrieval cavity blocking crossbars 63 are in the state of blocking the aforementioned object retrieval cavity 131, the bottom surface of the aforementioned left lifting rod 61 is supported on the aforementioned left lifting rod support column 1121, and at the same time, the bottom surface of the aforementioned right lifting rod 62 is supported on the aforementioned right lifting rod support column 1221.

[0033] Please see Figure 6 And combined Figure 1 and Figure 2 In the aforementioned set of access cavity blocking crossbars 63, a crossbar resting elastic deformation support plate 142 is fixed to the rear side of the middle part of the first crossbar (i.e., the second one from top to bottom including the handle crossbar 631) of the aforementioned front frame longitudinal beam connecting crossbar 14 located below the aforementioned handle crossbar 631. When the aforementioned set of access cavity blocking crossbars 63 is released from blocking the aforementioned access cavity 131, the first front frame longitudinal beam connecting crossbar 14 located below the aforementioned handle crossbar 631 is supported on the aforementioned crossbar resting elastic deformation support plate 142. Figure 6 (as shown in the illustration). In this embodiment, the cross-sectional shape of the aforementioned left lifting rod 61 and right lifting rod 62 is circular, and the cross-sectional shape of the aforementioned left lifting rod sliding guide groove 112 and right lifting rod sliding guide groove 122 is semi-circular.

[0034] The aforementioned left storage rack shelf fixing beam 35 is located between the opposing sides of the aforementioned left frame front and rear longitudinal arms 31 and 32 via the left storage rack shelf fixing beam pivot locking mechanism 352; the aforementioned right storage rack shelf fixing beam 44 is located between the opposing sides of the aforementioned right frame front and rear longitudinal arms 41 and 42 via the right storage rack shelf fixing beam pivot locking mechanism 442, and the structure of the left storage rack shelf fixing beam pivot locking mechanism 352 is the same as the structure of the right storage rack shelf fixing beam pivot locking mechanism 442.

[0035] Please pay close attention. Figure 4 , Figure 5 and Figure 7The aforementioned right frame front longitudinal arm 41 has a right frame front longitudinal arm front wall 411 and a right frame front longitudinal arm rear longitudinal wall 412 in the height direction. A pair of right frame front longitudinal arm front wall holes 4111 and a pair of right frame front longitudinal arm rear wall holes 4121 are respectively opened on the right frame front longitudinal arm front wall 4111 and the right frame front longitudinal arm rear wall holes 4121, which are positioned to the left and right of each other. The pair of right frame front longitudinal arm front wall holes 4111 and the pair of right frame front longitudinal arm rear wall holes 4121 correspond to the front end of the aforementioned right storage grid shelf fixing crossbeam 44. A pivot hole 421 is opened on the aforementioned right frame rear longitudinal arm 42 at a position corresponding to the rear end of the aforementioned right storage grid shelf fixing crossbeam 44.The aforementioned right-side storage rack shelf fixing beam pivot locking mechanism 442 includes a front axle seat 4421, a spring plate 4422, a positioning shaft 4423, a rear axle seat 4424, and a pivot shaft 4425. A locking shaft hole 44211 is provided at the upper end of the front axle seat 4421. A front axle seat insertion limiting block 44212 extends from the rear side of the front axle seat 4421 and at a position corresponding to the front end of the aforementioned right-side storage rack shelf fixing beam 44. A limiting block insertion foot 44213 extends from the lower rear side of the front axle seat insertion limiting block 44212. The front end of the spring plate 4422 is positioned at the bottom of the limiting block insertion foot 44213 and engages with the limiting block insertion foot 44213. The retaining foot 44213 is fixed, and the rear end of the spring plate 4422 extends away from the retaining foot 44213 and forms an upwardly arched spring plate retaining shaft flange arch 44221 in the middle of the spring plate 4422. When the retaining foot 44213 is inserted into the crossbeam cavity 443 of the right storage grid shelf fixing crossbeam 44, the front axle seat retaining block 44212 is inserted and fixed to the cavity opening of the crossbeam cavity 443, and the rear side of the front axle seat 4421 contacts the front end face of the right storage grid shelf fixing crossbeam 44. The locking shaft hole 44211 communicates with the crossbeam cavity 443, and the left side of the spring plate 4422... The end of the limiting block insert 44213 is inserted into the crossbeam cavity 443, and the middle and right ends of the spring plate 4422 extend into the crossbeam cavity 443. A locking bend 44231 is formed at the front end of the positioning shaft 4423, and a positioning shaft locking flange 44232 is fixed at the rear end of the positioning shaft 4423 at a position corresponding to the aforementioned spring plate 4422. This positioning shaft locking flange 44232 contacts or de-contacts the spring plate 4422. The aforementioned locking bend 44231 is connected to the upper right frame front longitudinal arm front wall hole 4111 and the pair of right frame front longitudinal arm rear wall holes 4111. The upper right frame front trailing arm rear wall hole 4121 in section 21 is inserted into the aforementioned positioning shaft 4423, which is sequentially inserted into the lower right frame front trailing arm front wall hole 4111 of a pair of right frame front trailing arm front wall holes 4111, the lower right frame front trailing arm rear wall hole 4121 of a pair of right frame front trailing arm rear wall holes 4121, and the aforementioned locking shaft hole 44211, and extends into the aforementioned beam cavity 443. The front end of the right axle seat 4424 is inserted into the rear end of the beam cavity 443 of the right storage grid shelf fixing beam 44. The pivot shaft 4425 extends from the rear end of the right axle seat 442 and pivotally engages with the aforementioned pivot shaft hole 421.

[0036] Please see Figure 8 And combined Figure 2A locking shaft mounting hole 422 and a rear limiting shaft sliding hole 423 are provided on the aforementioned right frame rear longitudinal arm 42 at a position corresponding to the aforementioned rear frame front longitudinal arm locking mechanism 7. A rear frame front longitudinal arm limiting tongue 221 is fixed on the aforementioned rear frame front longitudinal arm 22 at a position below the right side corresponding to the aforementioned rear limiting shaft sliding hole 423. The aforementioned rear frame front longitudinal arm locking mechanism 7 locks or unlocks the aforementioned rear frame front longitudinal arm limiting tongue 221 above the aforementioned rear frame front longitudinal arm limiting tongue 221 at a position corresponding to the aforementioned locking shaft mounting hole 422.

[0037] See the key points Figure 8 The aforementioned rear frame front longitudinal arm locking mechanism 7 includes a latch plate locking shaft 71 and a latch plate insert 72. The latch plate locking shaft 71 includes a handle 711, a front limiting shaft 712, a journal 713, and a rear limiting shaft 714. The handle 711 is located at the front end of the front limiting shaft 712. The front limiting shaft step surface 7121 of the front limiting shaft 712 contacts or de-contacts the first side surface 424 of the right frame rear longitudinal arm 42 of the aforementioned right frame rear longitudinal arm. The journal 713 is located between the front and rear limiting shafts 712 and 714, and the diameter of the journal 713 is smaller than the shaft diameters of the front limiting shaft 712 and the rear limiting shaft 714, while the diameters of the front and rear limiting shafts 714 are the same. The journal 713 is slidably engaged with the aforementioned locking shaft hole 422, and the rear limiting shaft 714 is slidably engaged with the rear limiting shaft sliding hole 423. The rear limiting shaft step surface 7141 of the rear limiting shaft 714 contacts or releases contact with the second side surface 425 of the right frame rear longitudinal arm 42. The locking tongue plate pocket 72 is fixed to the aforementioned right frame rear longitudinal arm 42 at the position corresponding to the aforementioned rear frame front longitudinal arm limiting tongue plate 221. The aforementioned rear frame front longitudinal arm limiting tongue plate 221 is inserted into or removed from the locking tongue plate pocket 72, and as the aforementioned locking tongue plate locking shaft 71 slides backward or forward, the aforementioned rear limiting shaft 714 limits or releases the upper part of the aforementioned rear frame front longitudinal arm limiting tongue plate 221.

[0038] The bottom of the latch plate insert 72 mentioned above can be either closed or open. If it is open, it can be called a latch plate insert sleeve. In this embodiment, the latter is chosen.

[0039] Please see Figure 9 And combined Figure 8 ,exist Figure 8In the indicated state, due to the rear limiting shaft 714's rearward displacement corresponding to the upper part of the front longitudinal arm limiting tongue plate 221 of the rear frame, and the front limiting shaft step surface 7121 abutting against the aforementioned first side surface 424 of the right frame rear longitudinal arm, the rear frame front longitudinal arm limiting tongue plate 221 is restricted by the rear limiting shaft 714, thus the entire rear frame 2 cannot be raised the required distance as needed, i.e., the rear frame front longitudinal arm limiting tongue plate 221 cannot be moved upward away from the locking tongue plate pocket 72. Simultaneously, the hinge pin 2111, which forms the structural system of the rear frame rear longitudinal arm hinge 211, cannot move upward accordingly. Furthermore, in this state, the aforementioned limiting hook head 4131 is hooked into the hook head mating hole 54, therefore the present invention can only be presented as... Figure 2 and Figure 6 The enclosure state is shown. Conversely, when the lever 711 is pulled, the front limiting shaft 712, the journal 713, and the buckle limiting shaft 714, which are integrally formed, move, and the rear limiting shaft 714 slides forward in the rear sliding shaft sliding hole 423 until the rear limiting shaft step surface 7141 contacts the second side surface 425 of the right frame rear longitudinal arm. In this state, the rear limiting shaft 714 retracts from the rear frame front longitudinal arm limiting tongue 221, that is, the locking of the rear frame front longitudinal arm limiting tongue 221 is released. In this state, the rear frame 2 can be lifted upward until the rear frame front longitudinal arm limiting tongue 221 moves upward and exits (retracts) the locking tongue insert 72. At this time, the rear frame 2 and the left frame 3 can be presented with a wing-like effect. Figure 9 In the state shown, with the limiting hook head 4131 of the limiting hook 413 retracted from the hook head mating hole 54, the right frame 4 also unfolds like the left frame 3. Figure 9 In the indicated state, the aforementioned left and right storage grid shelves 351 and 441 can be flipped to their respective positions via the left storage grid shelf fixing beam pivot locking mechanism 352 and the right storage grid shelf fixing beam pivot locking mechanism 442. Figure 9 The state shown. The aforementioned left and right storage grid shelves 351 and 441 are... Figure 2 and Figure 6 The horizontal state shown is flipped to the one indicated by Figure 9 During the vertical positioning process, a force needs to be applied manually to the left and right storage rack shelves 351 and 441 to make the positioning shaft locking flange 44232 overcome the reaction force of the spring plate limiting shaft flange arc arch 44221, and vice versa. This allows for the connection between milk carts with the corresponding structures of this invention, facilitating storage and transportation in the logistics process, thus reducing the space occupied in the storage state.

[0040] When customers shop, this invention places packaged milk bottles and / or milk cartons in a container. Figure 2The aforementioned left and right storage grille shelves 351 and 441 are shown in the indicated state. When a customer takes a milk cart, they simply grasp the handle bar 631 and lift it upwards until the space between the upper and lower adjacent retrieval cavity blocking bars 63 corresponds to the retrieval cavity opening 131 and forms a straight line. Figure 5 As shown in the diagram, during the upward lifting of the handle crossbar 631, a retrieval cavity blocking crossbar 63 located below the handle crossbar 631 will, while overcoming the resistance of the crossbar resting elastic deformation support plate 142, wind around to the top of the crossbar resting elastic deformation support plate 142 and rest on it (in the form of...). Figure 6 (as shown in the image), and vice versa. Figure 2 The state shown will not be repeated.

[0041] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. A front frame and retrieval door assembly structure for a milk cart, characterized in that: The device includes a front frame (1) and a retrieval door (6). The front frame (1) includes a left longitudinal beam (11), a right longitudinal beam (12), and a front frame storage grid shelf front support beam (13). The left longitudinal beam (11) and the right longitudinal beam (12) are parallel to each other longitudinally. There is one set of front frame storage grid shelf front support beams (13), which are fixed at intervals between the opposite sides of the left and right longitudinal beams (11, 12). The space between each pair of adjacent front frame storage grid shelf front support beams (13) forms a retrieval cavity (131). The retrieval door (6) is located in the height direction of the left longitudinal beam (11) and the right longitudinal beam (12) of the front frame. Between the opposing sides, the retrieval door (6) slides up and down with the left longitudinal beam (11) and the right longitudinal beam (12) of the front frame to form a sliding pair. When the retrieval door (6) is pulled up, it releases the obstruction of the retrieval cavity (131), and when the retrieval door (6) returns down, it restores the obstruction of the retrieval cavity (131). Between the opposing sides of the left longitudinal beam (11) and the right longitudinal beam (12) of the front frame, and in front of the front support beam (13) of each front frame storage grid shelf, there is a front frame longitudinal beam connecting crossbar (14). The front frame longitudinal beam connecting crossbar (14) and the front support beam (13) of the front frame storage grid shelf are connected. 3) The space between them is configured as a lifting crossbar cavity (141); a left lifting rod sliding guide groove (112) is formed on the side of the left longitudinal beam (11) of the front frame facing the right longitudinal beam (12) of the front frame and along the height direction of the left longitudinal beam (11) of the front frame, and a right lifting rod sliding guide groove (122) is formed on the side of the right longitudinal beam (12) of the front frame facing the right longitudinal beam (12) of the front frame; the retrieval door (6) includes a left lifting rod (61), a right lifting rod (62) and a set of retrieval cavity opening blocking crossbars (63), the left lifting rod (61) and the left lifting rod sliding guide groove (112) form a sliding pair that slides up and down, and the right lifting rod (62) and the... The sliding guide groove (122) of the right lifting rod forms a sliding pair that slides up and down. A set of retrieval cavity blocking crossbars (63) are connected from top to bottom between the left and right lifting rods (61, 62) at positions corresponding to the lifting crossbar cavity (141). The spacing between each pair of adjacent retrieval cavity blocking crossbars (63) is adapted to the spacing between the two adjacent front frame longitudinal beam connecting crossbars (14). In the set of retrieval cavity blocking crossbars (63), the top retrieval cavity blocking crossbar (63) forms a handle crossbar (631). The left end of the handle crossbar (631) is connected to the top of the left lifting rod (61), and the right end is connected to the top of the right lifting rod (62).A crossbar support elastic deformation plate (142) is fixed at the rear side of the middle of the first front frame longitudinal beam connecting crossbar (14) located below the handle crossbar (631) along its length direction. When the set of retrieval cavity blocking crossbars (63) releases their obstruction of the retrieval cavity (131), the first front frame longitudinal beam connecting crossbar (14) located below the handle crossbar (631) is supported on the crossbar support elastic deformation plate (142).

2. The front frame and retrieval door assembly structure of the milk cart according to claim 1, characterized in that: The retrieval door (6) forms a sliding pair with the opposite side of the left longitudinal beam (11) and the right longitudinal beam (12) of the front frame at the position corresponding to the lifting crossbar cavity (141).

3. The front frame and retrieval door assembly structure of the milk cart according to claim 1 or 2, characterized in that: The left end of the connecting crossbar (14) of the front frame longitudinal beam is fixed to the left longitudinal beam (11) of the front frame at a position corresponding to the left lifting rod sliding guide groove (112), while the right end is fixed to the right longitudinal beam (12) of the front frame at a position corresponding to the right lifting rod sliding guide groove (122); the left end of the front end support crossbar (13) of the front frame storage grid shelf is fixed to the left longitudinal beam (11) of the front frame at a position corresponding to the left lifting rod sliding guide groove (112), while the right end is fixed to the right longitudinal beam (12) of the front frame at a position corresponding to the right lifting rod sliding guide groove (122); the retrieval door (6) forms a sliding pair with the left lifting rod sliding guide groove (112) and the right lifting rod sliding guide groove (122).

4. The front frame and retrieval door assembly structure of the milk cart according to claim 1, characterized in that: A left lifting rod support column (1121) is fixed at the lower part of the left lifting rod sliding guide groove (112), and a right lifting rod support column (1221) is fixed at the lower part of the right lifting rod sliding guide groove (122) and at a position corresponding to the left lifting rod support column (1121). When the set of object retrieval cavity blocking crossbars (63) are blocking the object retrieval cavity (131), the bottom surface of the left lifting rod (61) is supported on the left lifting rod support column (1121), and at the same time, the bottom surface of the right lifting rod (62) is supported on the right lifting rod support column (1221).

5. The front frame and retrieval door assembly structure of the milk cart according to claim 1 or 4, characterized in that: The cross-sectional shape of the left lifting rod (61) and the right lifting rod (62) is circular, and the cross-sectional shape of the left lifting rod sliding guide groove (112) and the right lifting rod sliding guide groove (122) is semi-circular.

6. The front frame and retrieval door cooperation structure of the milk cart according to claim 3, characterized in that: A left longitudinal beam hinge (111) is provided at intervals on the rear side of the left longitudinal beam (11) of the front frame and along the height direction of the left longitudinal beam (11) of the front frame, and a right longitudinal beam hinge (121) is provided at intervals on the rear side of the right longitudinal beam (12) of the front frame and along the height direction of the right longitudinal beam (12) of the front frame.

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