Vending machine for second-hand digital product selling

Abstract

The invention relates to the technical field of commodity vending machines, in particular to a second-hand vending machine for selling digital products, which comprises a vending machine body, the discharging assembly comprises an embedded part arranged in the vending machine body, a clamping part arranged on the end face of the embedded part and a balance weight part arranged on the outer side of the embedded part. The embedded part comprises a goods bearing disc and a first limiting groove formed in the outer wall of the goods bearing disc. The clamping piece comprises a second limiting groove formed in the outer wall of the goods bearing disc. Moreover, the counter weight part comprises a first concave part and a second concave part which are formed in the inner wall of the vending machine body, when a digital product falls into the goods bearing disc, a section of displacement is generated, a counter weight block is clamped into the embedded part and then performs secondary displacement, and the goods taking door is driven to move in the horizontal direction through the displacement of the goods bearing disc; therefore, automatic opening and closing actions are achieved along with the pick-and-place state of goods, and personnel can pick digital products conveniently.

Description

Technical Field

[0001] This invention relates to the field of vending machine technology, and in particular to a vending machine for selling second-hand digital products. Background Technology

[0002] In the vending machine sector, specialized vending machines for secondhand digital products (such as mobile phones, tablets, and cameras) are gradually emerging. These machines typically integrate internet technology to enable remote inventory management, online payment, and product information traceability, ensuring the authenticity verification and transparent status of secondhand products. The application of internet technology has significantly improved the convenience and credibility of secondhand digital product transactions, becoming a crucial technological support for this niche market.

[0003] After payment is completed using methods such as currency, facial recognition, or QR code payment, the payment information is verified using internet technology, the goods are controlled to fall, and the person opens the pickup door to retrieve the goods. However, when it is inconvenient for the person to bend down to open the pickup door, it will increase the difficulty of retrieving the goods. Although existing technologies have structures that use mechanical structures to automatically open and close the pickup door, when the digital product itself is light, it cannot guarantee sufficient downward pressure to complete the opening and closing action of the pickup door. Summary of the Invention

[0004] In view of the problems existing in the above or prior art, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide an automatic vending machine for selling second-hand digital products.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an automatic vending machine for selling second-hand digital products, comprising: a vending machine body; and a feeding assembly, including an insert disposed inside the vending machine body, a clamping member disposed on the end face of the insert, and a counterweight disposed outside the insert; wherein, the insert includes a receiving tray and a first limiting groove formed on the outer wall of the receiving tray; and the clamping member includes a second limiting groove formed on the outer wall of the receiving tray; and the counterweight includes a clamping member formed on the outer wall of the vending machine body. The vending machine body has a first concave portion and a second concave portion on its inner wall. The inner side of the second concave portion is provided with a counterweight block that is adapted to the inner wall of the first limiting groove and the second limiting groove. The vending machine body also includes an opening and closing assembly, which includes a dispensing door disposed on the inner wall of the vending machine body. During the downward movement of the tray, the counterweight block is engaged in the first limiting groove, increasing the weight of the tray. The increased weight of the tray causes it to descend, which in turn drives the dispensing door to open. This achieves the effect of the door automatically opening after the digital product is dispensed and automatically closing after the product is dispensed.

[0007] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products, wherein: the embedded member includes a tray disposed inside the vending machine body and a first limiting groove formed on the outer wall of the tray.

[0008] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products, wherein: the upper and lower sides of the inner wall of the first limiting groove are both the first inclined surfaces, and the end of the bottom wall of the first inclined surface away from the receiving tray is a horizontal surface.

[0009] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products, wherein: the upper and lower sides of the inner wall of the second limiting groove are both the second inclined surfaces, and the end of the bottom vertical surface away from the receiving tray is a vertical surface.

[0010] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products, wherein: the counterweight further includes an inner groove formed in the inner wall of the first concave portion, the inner wall of the inner groove is provided with a second spring, and the end of the second spring is provided with a contact plate.

[0011] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products is provided with a limiting plate on the inner wall of the first concave portion, and the limiting plate and the end face of the second concave portion are in the same vertical direction.

[0012] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products is provided, wherein: the top end face of the counterweight is integrally formed with an extension portion, the extension portion is in contact with the contact plate, and the length of the extension portion is the same as the distance between the vending machine body and the second concave portion.

[0013] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products, wherein: the upper and lower sides of the outer wall of the counterweight are both third inclined surfaces, and the inclination of the third inclined surface is the same as that of the first inclined surface and the second inclined surface.

[0014] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products, wherein: the opening and closing assembly further includes a fixing plate disposed on the vending machine body, and the outer wall of the dispensing door is provided with a limiting part, the limiting part and the fixing plate being adapted to each other.

[0015] As a preferred embodiment of the present invention, an automatic vending machine for selling second-hand digital products is provided, wherein: a guide rod is provided on the end face of the dispensing door, and a guide groove adapted to the guide rod is provided on the outer wall of the receiving tray.

[0016] The beneficial effects of the automatic vending machine for selling second-hand digital products according to the present invention are as follows: When a digital product falls into the receiving tray, it first undergoes a displacement, and then the counterweight is inserted into the insert for a second displacement. The displacement of the receiving tray drives the retrieval door to move horizontally, thereby completing the automatic opening and closing action in accordance with the retrieval and placement of goods, making it convenient for people to take digital products. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an automatic vending machine for selling second-hand digital products.

[0019] Figure 2 This is a schematic diagram of the internal structure of a vending machine body for selling second-hand digital products.

[0020] Figure 3 This is a schematic diagram of the feeding component structure of an automatic vending machine for selling second-hand digital products.

[0021] Figure 4 This is a schematic diagram of the tray structure of an automatic vending machine for selling second-hand digital products.

[0022] Figure 5 This is a partial structural diagram of an automatic vending machine for selling second-hand digital products.

[0023] Figure 6 This is a schematic diagram of the counterweight structure of an automatic vending machine for selling second-hand digital products.

[0024] Figure 7 This is a schematic diagram of the counterweight structure of an automatic vending machine for selling second-hand digital products.

[0025] Figure 8 This is a schematic diagram of the opening and closing components of an automatic vending machine for selling second-hand digital products.

[0026] In the diagram, 1. Vending machine body; 2. Feeding assembly; 21. Embedded part; 211. Carrying tray; 212. First limiting groove; 213. Horizontal plane; 214. First inclined plane; 215. First spring; 22. Clamping part; 221. Second limiting groove; 222. Second inclined plane; 223. Vertical plane; 23. Counterweight; 231. First concave part; 232. Second concave part; 233. Inner groove; 234. Second spring; 235. Contact plate; 236. Limiting plate; 237. Counterweight block; 238. Extension part; 239. Third inclined plane; 3. Opening and closing assembly; 31. Retrieval door; 32. Limiting part; 33. Fixing plate; 34. Guide rod; 35. Guide groove. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1

[0031] Reference Figures 1 to 4 This is the first embodiment of the present invention. This embodiment provides a method for a vending machine for selling second-hand digital products to complete a complete descent action after a lighter product is delivered, so as to ensure that the tray 211 is still lowered to the position of the delivery port after the lighter product is delivered.

[0032] Specifically, a vending machine for selling second-hand digital products includes a vending machine body 1; wherein the vending machine body 1 contains different types of second-hand digital products and integrates Internet technology. When a person completes payment, the payment structure is detected online to realize the dispensing of digital products. The bottom of the vending machine body 1 needs to reserve enough space for the tray 211 to fall.

[0033] And the feeding component 2 includes an insert 21 disposed inside the vending machine body 1, a clamping member 22 disposed on the end face of the insert 21, and a counterweight 23 disposed on the outside of the insert 21; wherein, the insert 21 is used to insert the counterweight 237 so that the counterweight 237 and the receiving tray 211 form a whole, the clamping member 22 is used to squeeze and limit the receiving tray 211, and the counterweight 23 holds the receiving tray 211 into the insert 21 and ensures that the counterweight 237 can be reset.

[0034] The embedded part 21 includes a receiving tray 211 disposed inside the vending machine body 1 and a first limiting groove 212 formed on the outer wall of the receiving tray 211. The inner top of the receiving tray 211 is concave to ensure that the digital product can fall stably into the receiving tray 211 after being dispensed from the vending machine. The first limiting groove 212 is formed on both sides of the outer wall of the receiving tray 211 and has a certain depth to ensure that the counterweight 237 can be stably inserted into the receiving tray 211.

[0035] Furthermore, the clamping member 22 includes a second limiting groove 221 formed on the outer wall of the receiving tray 211; wherein, the second limiting groove 221 is also designed in two sets, starting from the two sides of the outer wall of the receiving tray 211 respectively, and its height is lower than the first limiting groove 212, and its depth is also lower than the first limiting groove 212. There is a certain distance between the first limiting groove 212 and the second limiting groove 221, ensuring that the second limiting groove 221 can completely insert the counterweight 237 into the second inner recess 232.

[0036] Furthermore, the counterweight 23 includes a first recess 231 and a second recess 232 formed on the inner wall of the vending machine body 1. The inner side of the second recess 232 is provided with a counterweight block 237 that is adapted to the inner wall of the first limiting groove 212 and the second limiting groove 221. The counterweight 23 is designed in two sets and is set on both sides of the receiving tray 211, both on the inner wall of the vending machine body 1. The second recess 232 is recessed relative to the surface of the vending machine body 1, and the distance between the two allows the extension 238 to pass through vertically.

[0037] And, the opening and closing component 3 includes a dispensing door 31 installed on the inner wall of the vending machine body 1; wherein, the dispensing door 31 is designed in two sets to block the dispensing opening together, and the dispensing door 31 can slide on the inner wall of the vending machine body 1 to complete the opening and closing action as the tray 211 rises and falls.

[0038] During the downward movement of the pallet 211, the counterweight 237 is engaged in the first limiting groove 212, increasing the weight of the pallet 211 itself. The increased weight of the pallet 211 causes it to descend, which in turn drives the retrieval door 31 to open, thus achieving the effect of the door automatically opening after the digital products are shipped and automatically closing after the products are retrieved.

[0039] Furthermore, the insert 21 also includes a first spring 215 fixedly connected to the end face of the vending machine body 1, with the end of the first spring 215 fixedly connected to the end face of the receiving tray 211. The first spring 215 has a certain elastic force. When there are no digital products on the surface of the receiving tray 211, the elastic force of the first spring 215 will cause the receiving tray 211, which carries the counterweight 237, to rise. In the initial state, the elastic force of the first spring 215 will control the receiving tray 211 to a certain height. At this position, the second limiting groove 221 contacts the counterweight 237 located in the second recess 232, achieving stability of the counterweight 237's position. When the vending machine body 1 receives a command from the internet, it will dispense the digital products. Simultaneously, because the receiving tray 211 has a certain height at this time, the distance between the drop outlet and the receiving tray 211 can be reduced, thereby reducing the impact force when the digital products fall and avoiding damage to the digital products.

[0040] Preferably, the inner walls of the first limiting groove 212 are both first inclined surfaces 214 on the upper and lower sides, and the end of the bottom first inclined surface 214 away from the receiving tray 211 is a horizontal surface 213. The first inclined surface 214 on the lower and upper sides of the inner walls of the first limiting groove 212 is a first inclined surface 214, and the portion of the bottom first inclined surface 214 near the outer side is a horizontal surface 213. Thus, the first inclined surface 214 and the horizontal surface 213 can be used to limit the counterweight 237, ensuring it is stably embedded in the first limiting groove 212. However, the length of the horizontal surface 213 cannot be too long to prevent the counterweight 237 from becoming unable to detach.

[0041] The inner walls of the second limiting groove 221 are both second inclined surfaces 222 on the upper and lower sides, and the bottom vertical surface 223 is a vertical surface 223 at the end away from the receiving tray 211. The fact that the upper and lower sides of the second limiting groove 221 are both second inclined surfaces 222 makes it compatible with the counterweight 237, thereby limiting the counterweight 237. The length of the bottom second inclined surface 222 is shorter than that of the top second inclined surface 222, and the end face of the bottom second inclined surface 222 is a vertical surface 223, thereby ensuring that the bottom does not completely restrict the counterweight 237.

[0042] When in use, after personnel complete the payment for second-hand digital products using payment methods such as coin payment, facial recognition payment, or QR code payment, the online Internet is used to detect and analyze whether the payment is completed. After issuing the order to ship the digital products, the digital products fall from the shelf onto the surface of the receiving tray 211. In the initial state, the first spring 215 controls the receiving tray 211 to be in a balanced and static state. When a digital product falls, it will give the receiving tray 211 a certain downward pressure, thereby squeezing the first spring 215 and performing the first descent action. In the initial state, the first limiting groove 212 is above the counterweight 237. The second inclined surface 222 of the bottom wall of the second limiting groove 221, together with the contact plate 235, limits the counterweight 237 and keeps it in a static state.

[0043] In summary, the falling of the digital product causes the pallet 211 to compress the first spring 215, thereby causing a displacement. This transforms the second limiting groove 221 into the first limiting groove 212 that contacts the counterweight 237, thus preparing the weight for subsequent secondary displacement.

[0044] Example 2

[0045] Reference Figures 2-7 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides how to insert the counterweight 237 into the cargo tray 211 and how to achieve a reset action during the lifting of the cargo tray 211.

[0046] Specifically, the counterweight 23 also includes an inner groove 233 formed in the inner wall of the first recess 231. A second spring 234 is fixedly connected to the inner wall of the inner groove 233, and a contact plate 235 is fixedly connected to the end of the second spring 234. The inner groove 233 extends into the inner wall of the vending machine body 1 to install the second spring 234. The second spring 234 is located in the middle of the inner groove 233 and is fixed to the contact plate 235, so that it contacts the counterweight 237. The compressive force of the second spring 234 gives the counterweight 237 a certain force, causing it to be engaged in the first limiting groove 212.

[0047] Furthermore, a limiting plate 236 is fixedly connected to the inner wall of the first recess 231, and the limiting plate 236 and the end face of the second recess 232 are in the same vertical direction. The limiting plates 236 are fixedly connected to both sides of the inner wall of the inner groove 233 to limit the movement range of the contact plate 235, preventing it from protruding beyond the position of the second recess 232 and avoiding interference with the contact plate 235 during the descent of the pallet 211. It should be noted that the length of the counterweight 237 must be between the two limiting plates 236.

[0048] Preferably, the top end face of the counterweight 237 has an integrally formed extension 238, which contacts the contact plate 235. The length of the extension 238 is the same as the distance between the vending machine body 1 and the second recess 232. The extension 238 is integrally formed on one side of the top of the counterweight 237. During the upward movement, the extension 238 contacts the inner wall of the first recess 231, thereby completing the reset action of the counterweight 237. Since the outer wall of the extension 238 of the counterweight 237 contacts the inner wall of the first recess 231 when it is in the initial position, the second recess 232 ensures the normal downward movement of the counterweight 237.

[0049] It should be noted that the upper and lower sides of the outer wall of the counterweight 237 are both third inclined surfaces 239, and the inclination of the third inclined surface 239 is the same as that of the first inclined surface 214 and the second inclined surface 222. Since the upper and lower sides of the inner walls of the first limiting groove 212 and the second limiting groove 221 are both designed with inclination, the third inclined surface 239, which ensures that the upper and lower sides of the outer wall of the counterweight 237 are compatible with the inner walls of the two limiting grooves, allows it to be engaged in the two limiting grooves. At the same time, the inclined design of the upper and lower sides of the outer wall of the counterweight 237 ensures that the counterweight 237 is compressed during the rising or falling process to complete the insertion or reset action.

[0050] The rest of the structure is the same as in Example 1.

[0051] During use, after the pallet 211 is displaced once, the second inclined surface 222 at the top of the second limiting groove 221 contacts the third inclined surface 239 on the outer wall of the counterweight 237, causing the counterweight 237 to move inward toward the inner side of the inner groove 233, thereby squeezing the second spring 234. When the first limiting groove 212 begins to contact the counterweight 237, the counterweight 237 has moved into the second concave portion 232. When the first limiting groove 212 and the counterweight 237 are highly overlapped, the counterweight 237 is pushed into the first limiting groove 212 by the pushing force of the second spring 234, while the contact plate 235 is limited by the limiting plate 236 and will not continue to move, thus avoiding interference with the downward movement of the pallet 211.

[0052] When the counterweight 237 is inserted into the first limiting groove 212, the counterweight 237 and the supporting tray 211 form a whole, increasing the overall weight of the supporting tray 211. At this time, the weight of the digital product, the supporting tray 211 and the counterweight 237 must be greater than the elastic force of the first spring 215, so that it can continue to be pressed down to the bottom to complete the secondary displacement.

[0053] After the goods are removed, the first spring 215 causes the receiving tray 211 to rise. When the counterweight 237, embedded in the first limiting groove 212, moves into the first recess 231, the extension 238 contacts the inner wall of the first recess 231, thus limiting the counterweight 237. The receiving tray 211 continues to rise, and the contact between the first inclined surface 214 and the third inclined surface 239 at its bottom presses the counterweight 237, causing it to be stuck in the inner groove 233. During the continuous pressing process of the counterweight 237, the second spring 234 is driven to squeeze. When the first spring 215 controls the pallet 211 to move to the initial position, the second limiting groove 221 and the counterweight 237 are at the same height. At this time, the counterweight 237 is no longer limited by the pallet 211. It is pushed to the second limiting groove 221 by the kinetic energy given by the compression of the second spring 234. The second limiting groove 221 is determined according to the movement position of the counterweight 237 controlled by the second spring 234 in the static state. Thus, the second inclined surface 222 limits the counterweight 237 to keep it in a static state, thereby completing the reset action of the counterweight 237.

[0054] In summary, after the pallet 211 is displaced once, the counterweight 237 is driven into the first limiting groove 212. After increasing the weight of the pallet 211, the second displacement is completed, providing kinetic energy for the opening and closing of the subsequent loading door 31. This device mainly ensures that digital products that are not heavy enough can complete the second displacement by increasing the weight of the counterweight 237.

[0055] Example 3

[0056] Reference Figure 2 and Figure 8 This is the third embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a method to control the opening and closing of the picking door 31 by using the displacement generated by the rising and falling of the loading tray 211.

[0057] Specifically, the opening and closing assembly 3 also includes a fixing plate 33 fixedly connected to the vending machine body 1, and a limiting part 32 fixedly connected to the outer wall of the dispensing door 31, the limiting part 32 and the fixing plate 33 being compatible. The fixing plate 33 is located on the bottom wall of the dispensing opening of the vending machine body 1, and the guide between the fixing plate 33 and the limiting part 32 ensures that the dispensing door 31 always moves in the horizontal direction, thereby driving the dispensing doors 31 on both sides to complete the opening and closing action.

[0058] Furthermore, a guide rod 34 is fixedly connected to the end face of the retrieval door 31, and a guide groove 35 adapted to the guide rod 34 is provided on the outer wall of the receiving tray 211. The guide rod 34 is located in the middle of the outer wall of the retrieval door 31, thereby ensuring the stability of the retrieval door 31 when the guide groove 35 drives the retrieval door 31 to complete the movement process. The guide groove 35 is designed with an inclination, with the top close to the counterweight 23 and the bottom away from the counterweight 23. The distance from when the receiving tray 211 starts to move after contacting the counterweight 237 and stops moving needs to be adapted to the guide groove 35, thereby ensuring that the retrieval door 31 is fully opened.

[0059] The rest of the structure is the same as in Example 2.

[0060] In use, when the counterweight 237 disengages from the inner side of the second recess 232 and is inserted into the first limiting groove 212, the receiving tray 211 undergoes a secondary displacement. At this time, the bottom of the guide groove 35 contacts the guide rod 34. As the receiving tray 211 gradually descends, the guide rod 34 gradually approaches the top of the guide groove 35. Since the bottom of the retrieval door 31 is provided with a limiting part 32, the insertion limit between the limiting part 32 and the fixing plate 33 ensures that the retrieval door 31 can only move in the horizontal direction. As the receiving tray 211 gradually descends, it drives the retrieval door 31 to open. When the personnel take out the digital product, the elastic force of the first spring 215 drives the receiving tray 211 to gradually rise. At this time, the guide rod 34 moves in the opposite direction to the descent of the receiving tray 211, causing the retrieval doors 31 on both sides to move closer to each other, thereby sealing the retrieval opening and completing the product delivery. The retrieval door 31 automatically opens, the product is taken out, and the retrieval door 31 automatically closes.

[0061] In summary, the displacement of the descending pallet 211 drives the guide rod 34 to move along the guide groove 35, while the fixed plate 33 horizontally limits the retrieval door 31, thereby enabling it to complete adaptive opening and closing operations and improving the convenience for personnel to retrieve goods.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatic vending machine for selling second-hand digital products, characterized in that: include, The vending machine itself (1); and, The feeding assembly (2) includes an insert (21) disposed inside the vending machine body (1), a clamping member (22) disposed on the end face of the insert (21), and a counterweight (23) disposed on the outside of the insert (21); wherein, The insert (21) includes a tray (211) disposed inside the vending machine body (1) and a first limiting groove (212) formed on the outer wall of the tray (211); and, The clamping member (22) includes a second limiting groove (221) formed on the outer wall of the receiving tray (211); and, The counterweight (23) includes a first recess (231) and a second recess (232) formed on the inner wall of the vending machine body (1). The inner side of the second recess (232) is provided with a counterweight block (237) that is adapted to the inner walls of the first limiting groove (212) and the second limiting groove (221); and... The opening and closing assembly (3) includes a dispensing door (31) disposed on the inner wall of the vending machine body (1); wherein, During the downward movement of the pallet (211), the counterweight (237) is inserted into the first limiting groove (212), increasing the weight of the pallet (211). The increased weight of the pallet (211) causes the descent height to drive the retrieval door (31) to open, thereby achieving the effect of automatic opening of the door after the digital product is shipped and automatic closing of the door after retrieval.

2. The vending machine for selling second-hand digital products as described in claim 1, characterized in that: The insert (21) also includes a first spring (215) disposed on the end face of the vending machine body (1), the end of the first spring (215) being disposed on the end face of the tray (211).

3. The vending machine for selling second-hand digital products as described in claim 2, characterized in that: The inner walls of the first limiting groove (212) are both the first inclined surface (214) on the upper and lower sides, and the end of the first inclined surface (214) on the bottom wall away from the cargo tray (211) is a horizontal surface (213).

4. The vending machine for selling second-hand digital products as described in claim 3, characterized in that: The inner walls of the second limiting groove (221) are both the second inclined surface (222) on the upper and lower sides, and the bottom vertical surface (223) is a vertical surface (223) at the end away from the cargo tray (211).

5. The vending machine for selling second-hand digital products as described in claim 4, characterized in that: The counterweight (23) also includes an inner groove (233) formed on the inner wall of the first recess (231), and a second spring (234) is provided on the inner wall of the inner groove (233), and a contact plate (235) is provided at the end of the second spring (234).

6. The vending machine for selling second-hand digital products as described in claim 5, characterized in that: The inner wall of the first concave portion (231) is provided with a limiting plate (236), and the limiting plate (236) and the end face of the second concave portion (232) are in the same vertical direction.

7. The vending machine for selling second-hand digital products as described in claim 6, characterized in that: The counterweight (237) has an integrally formed extension (238) on the top end face. The extension (238) is in contact with the contact plate (235). The length of the extension (238) is the same as the distance between the vending machine body (1) and the second recess (232).

8. The vending machine for selling second-hand digital products as described in claim 7, characterized in that: The outer wall of the counterweight (237) has a third inclined surface (239) on both the upper and lower sides. The inclination of the third inclined surface (239) is the same as that of the first inclined surface (214) and the second inclined surface (222).

9. The vending machine for selling second-hand digital products as described in claim 8, characterized in that: The opening and closing assembly (3) also includes a fixing plate (33) disposed on the vending machine body (1), and a limiting part (32) is provided on the outer wall of the dispensing door (31), the limiting part (32) and the fixing plate (33) being adapted to each other.

10. The vending machine for selling second-hand digital products as described in claim 9, characterized in that: The end face of the picking door (31) is provided with a guide rod (34), and the outer wall of the receiving tray (211) is provided with a guide groove (35) that is compatible with the guide rod (34).

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