A mold vertical warehouse

The automated design of the mold vertical storage system solves the problems of mold surface cleaning and maintenance, realizes automated storage and maintenance of molds, reduces manual labor intensity, and improves management efficiency.

CN224544256UActive Publication Date: 2026-07-24特变电工山东鲁能泰山电缆有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
特变电工山东鲁能泰山电缆有限公司
Filing Date
2025-08-06
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

After use on the production site, molds are prone to oil and dust accumulation on their surface, resulting in high cleaning and maintenance costs and easy rusting due to improper manual operation. Existing technologies make it difficult to achieve reliable storage and maintenance of molds.

Method used

Design a mold storage unit, including sandblasting equipment, spraying equipment, mold rack, handling robot and main control cabinet. The unit automates the cleaning, polishing, rust prevention and storage of molds. The handling robot moves between the sandblasting equipment, spraying equipment and mold rack to realize the automatic storage and retrieval of molds.

Benefits of technology

It has enabled automated cleaning, polishing and maintenance of molds, reduced manual labor intensity, ensured reliable storage and maintenance of molds, avoided inadequate cleaning and maintenance, and improved management efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a mold vertical warehouse, and relates to the technical field of storage equipment, which comprises a sand blasting device, an oil spraying device, a mold rack and a main control cabinet. The sand blasting device is used for spraying sand on the mold when the mold is stored in the warehouse, so that the surface treatment of the mold is realized. The oil spraying device is used for spraying rust-proof oil on the mold when the mold is stored in the warehouse, so that the maintenance of the mold is realized. The mold rack is provided with a plurality of storage stations for storing the mold, so that the storage of the mold is realized. The mold vertical warehouse further comprises a walking track extending to the sand blasting device, the oil spraying device and the mold rack, and a carrying robot slidably arranged on the walking track. The carrying robot can take and place the mold and drive the mold to move between the sand blasting device, the oil spraying device and the mold rack. The mold vertical warehouse disclosed by the application can realize the automatic storage and withdrawal of the mold. Before the mold is stored in the warehouse, the mold can be automatically cleaned, polished, maintained and lubricated, so that the reliable storage and maintenance of the mold are realized.
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Description

Technical Field

[0001] This application relates to the field of warehousing equipment technology, and more specifically, to a mold vertical warehouse. Background Technology

[0002] Extrusion molds are used for extended periods on the production floor, and their surfaces are prone to accumulating oil and dust. Before storage, the molds must be cleaned and maintained, which significantly increases labor costs for operators and also increases the risk of rust due to improper manual handling.

[0003] Therefore, how to achieve reliable storage and maintenance of molds has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a mold storage unit to achieve reliable storage and maintenance of molds.

[0005] A mold storage unit includes a sandblasting device, an oil spraying device, a mold rack, and a main control cabinet. The sandblasting device is used to sandblast the mold, the oil spraying device is used to spray the mold with oil, and the mold rack is provided with multiple storage stations for storing molds.

[0006] The mold storage unit also includes a traveling track extending to the sandblasting equipment, the oil spraying equipment, and the mold material rack, as well as a slidable transport robot mounted on the traveling track, the transport robot being used to transport molds;

[0007] The handling robot, the sandblasting equipment, and the oil spraying equipment are all controlled by the main control cabinet.

[0008] Optionally, in the above-mentioned mold storage unit, the mold storage unit further includes a dust removal device for collecting the dust generated by the sandblasting equipment.

[0009] Optionally, in the above-mentioned mold vertical storage, the mold vertical storage further includes a preheating device for preheating the mold, and the traveling track extends to the preheating device.

[0010] Optionally, in the above-mentioned mold storage unit, the mold storage unit further includes a barcode scanning device for scanning molds, and the walking track extends to the barcode scanning device.

[0011] Optionally, in the mold vertical storage unit described above, the oil spraying equipment includes an oil spraying chamber, a nozzle, an oil storage tank, and a heating component. The nozzle is disposed in the oil spraying chamber and communicates with the oil storage tank, and the heating component is used to heat the oil storage tank.

[0012] Optionally, in the mold storage unit described above, the mold storage unit further includes a transport trolley and a charging device. The transport trolley is used to transport molds and to exchange molds with the handling robot. The charging device is used to charge the transport trolley.

[0013] Optionally, in the above-mentioned mold vertical storage, the mold vertical storage also includes a fence, which encloses a working area, and the handling robot, the walking track, the sandblasting equipment, the spraying equipment, the main control cabinet and the mold material rack are all set in the working area;

[0014] The travel track extends in a straight line, and along the extension direction of the travel track, the working area includes an auxiliary equipment area and a mold storage area arranged in sequence. The sandblasting equipment, the oil spraying equipment and the main control cabinet are all located in the auxiliary equipment area, and the mold material rack is located in the mold storage area.

[0015] Optionally, in the mold vertical storage unit described above, the sandblasting equipment, the oil spraying equipment, and the main control cabinet are located on the same side or different sides of the traveling track;

[0016] The mold material racks are multiple and arranged around the outer periphery of the travel track.

[0017] Optionally, in the mold vertical storage unit described above, the handling robot includes a robotic arm and a gripper. The base of the robotic arm is slidably mounted on the travel track via a slide block, and the gripper is located at the end of the robotic arm and is used to grasp the mold.

[0018] Optionally, in the mold vertical storage unit described above, the fixture is provided with two grippers, and the sidewalls of the two grippers facing each other are provided with buffer pads for fitting with the mold.

[0019] The mold storage unit provided in this application includes a sandblasting device, a painting device, a mold rack, and a main control cabinet. The sandblasting device is used to sandblast the molds upon arrival at the storage facility to achieve surface treatment. The painting device is used to spray rust-preventive oil onto the molds upon arrival at the storage facility to achieve mold maintenance. The mold rack is equipped with multiple storage stations for storing molds. The mold storage unit also includes a traveling track extending to the sandblasting device, the painting device, and the mold rack, as well as a slidable transport robot mounted on the traveling track. The transport robot, sandblasting device, and painting device are all controlled by the main control cabinet, which can centrally handle the signal interlocks between the sandblasting device, the painting device, and the transport robot. The transport robot can pick up and place molds and move them between the sandblasting device, the painting device, and the mold rack. During the warehousing process, the handling robot first grabs the mold and performs sandblasting on the sandblasting equipment to treat the surface of the mold. After the treatment is completed, the handling robot transfers the mold to the oil spraying equipment, which can evenly spray rust-preventive oil onto the surface of the mold to form an oil film for rust prevention. Finally, the handling robot can move the mold to the mold rack for storage, thus completing the automatic warehousing operation of the mold. During the outbound process, the handling robot can directly grab the mold from the mold rack and move it to the preset outbound position.

[0020] Compared with related technologies, the mold storage unit provided in this application can realize the automatic entry and exit of molds. Before the molds are put into storage, they can be automatically cleaned, polished and lubricated, avoiding the inadequate cleaning and maintenance that can occur with manual cleaning and maintenance. It can also effectively reduce the intensity of manual labor and achieve reliable storage and maintenance of molds. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a top view of the mold storage unit disclosed in the embodiments of this application;

[0023] Figure 2 This is a front view of the mold vertical storage unit disclosed in the embodiments of this application;

[0024] Figure 3 This is a schematic diagram of the structure of the fuel injection equipment disclosed in the embodiments of this application. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the structure of the fuel injection equipment disclosed in the embodiments of this application. Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the structure of the preheating equipment disclosed in the embodiments of this application. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of the structure of the preheating equipment disclosed in the embodiments of this application. Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the cooperation structure between the transport robot and the walking track disclosed in the embodiments of this application. Figure 1 ;

[0029] Figure 8 This is a schematic diagram of the cooperation structure between the transport robot and the walking track disclosed in the embodiments of this application. Figure 2 ;

[0030] Figure 9 This is a schematic diagram of the fixture disclosed in the embodiments of this application.

[0031] Among them, 100 is the main control cabinet, 101 is the display screen, 200 is the preheating equipment, 300 is the oil spraying equipment, 310 is the nozzle, 400 is the sandblasting equipment, 500 is the dust removal equipment, 600 is the mold material rack, 700 is the barcode scanning equipment, 800 is the transport trolley, 900 is the handling robot, 901 is the robotic arm, 902 is the clamp, 903 is the buffer pad, 910 is the walking track, 920 is the slide, and 930 is the mold. Detailed Implementation

[0032] The core of this application is to disclose a mold storage unit to achieve reliable storage and maintenance of molds.

[0033] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the utility model as described in the claims. It should be noted that, for ease of description, only the parts relevant to the utility model are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0034] Combination Figures 1-9The mold storage unit disclosed in this application includes a sandblasting device 400, an oil spraying device 300, a mold rack 600, and a main control cabinet 100. The sandblasting device 400 is used to sandblast the mold 930 upon entry into the storage unit to achieve surface treatment of the mold 930. The oil spraying device 300 is used to spray the mold 930 with anti-rust oil upon entry into the storage unit to achieve maintenance of the mold 930. The mold rack 600 is provided with multiple storage stations for storing the mold 930. The mold storage unit also includes a walking track 910 extending to the sandblasting device 400, the oil spraying device 300, and the mold rack 600, as well as a slidable transport robot 900 mounted on the walking track 910. The transport robot 900, the sandblasting device 400, and the oil spraying device 300 are all controlled by the main control cabinet 100, and the main control cabinet 100 can centrally handle the signal interlocks between the sandblasting device 400, the oil spraying device 300, and the transport robot 900. The handling robot 900 can pick up and place the mold 930 and move the mold 930 between the sandblasting equipment 400, the spraying equipment 300 and the mold material rack 600.

[0035] Specifically, during the warehousing process, the handling robot 900 grabs the mold 930 and first performs sandblasting on the sandblasting equipment 400 to treat the surface of the mold 930. After the treatment, the handling robot 900 transfers the mold 930 to the oil spraying equipment 300, which can evenly spray rust-preventive oil onto the surface of the mold 930 to form an oil film for rust prevention. Finally, the handling robot 900 can move the mold 930 to the mold rack 600 for storage, thus completing the automatic warehousing operation of the mold 930. During the outbound process, the handling robot 900 can directly grab the mold 930 from the mold rack 600 and move it to the preset outbound position.

[0036] Compared with the prior art, the mold storage unit disclosed in this application can realize the automatic entry and exit of molds 930. Before the molds 930 are put into storage, they can be automatically cleaned, polished and lubricated, avoiding the inadequate cleaning and maintenance that can occur with manual cleaning and maintenance. It can also effectively reduce the intensity of manual labor and realize the reliable storage and maintenance of molds 930.

[0037] The aforementioned mold 930 can be an extrusion mold, injection mold, blow mold, or other mold, and this application embodiment does not limit this.

[0038] The sandblasting equipment 400 can specifically be a high-pressure rotary sandblasting machine. Through an automated sandblasting process, it can remove rust, scale, and roughen the surface of various metal and non-metal molds 930, significantly improving the surface quality of the molds 930. The high-pressure rotary sandblasting machine adopts a cyclone separation closed-loop operation mode, and the abrasive material can be automatically recycled and reused, improving the abrasive material utilization rate. The high-pressure rotary sandblasting machine mainly consists of a main unit, a dust and sand separation system, a spray gun system, a dust collection box, an electrical system, an air compressor, a control box, etc. Its specific operating principle is existing technology and will not be described in detail in this application.

[0039] During the operation of the sandblasting equipment 400, the automatic door of the sandblasting equipment 400 opens, and the transport robot 900 places the mold 930 into the machine compartment of the sandblasting equipment 400. After the transport robot 900 resets, the automatic door of the sandblasting equipment 400 closes, and the spray gun system performs sandblasting on the mold 930. After sandblasting, the cleaning gun blows away the dust and sand on the surface of the mold 930. After the treatment is completed, the automatic door opens, the transport robot 900 removes the mold 930 from the machine compartment, and then the automatic door closes. The sandblasting time can be adjusted according to the actual situation.

[0040] Furthermore, the sandblasting equipment 400 is equipped with an automatic rotary table inside the machine compartment. The mold 930 is placed on the automatic rotary table. During the sandblasting process, the automatic rotary table can drive the mold 930 to rotate, thereby ensuring that the surface of the mold 930 is sandblasted evenly.

[0041] Further optimization of the design includes a dust collection device 500 for the mold storage unit. This device 500 is used to adsorb and collect dust generated by the sandblasting equipment 400 during the sandblasting process, ensuring a clean and safe working environment and guaranteeing that the emitted gas meets environmental protection standards. The specific structure of the dust collection device 500 is existing technology and will not be described in detail here.

[0042] The spray painting equipment 300 can use an atomizing oiling system to coat the surface of the mold 930; the working pressure of the atomizing oiling system is typically set in the range of 0.5 MPa to 0.8 MPa. In some embodiments, combined with Figure 3 and Figure 4The spraying equipment 300 includes a spray chamber, nozzles 310, an oil reservoir, and a heating component. The oil reservoir stores rust-preventive oil. The nozzles 310 are located within the spray chamber and connected to the oil reservoir. The heating component heats the oil reservoir to improve the fluidity of the rust-preventive oil and ensure atomization. Correspondingly, the spraying equipment 300 may also include a temperature controller and a temperature sensor. The temperature sensor detects the oil temperature in the oil reservoir, and the temperature controller controls the heating temperature and heating time of the heating component. The number of nozzles 310 is at least two, enabling spraying oil onto the mold 930 from both the top and bottom positions, ensuring comprehensive oil coverage. The amount of oil sprayed can be adjusted as needed. During the spraying operation, a transport robot 900 first transports the mold 930 into the spray chamber. Then, the atomization oiling system is activated, and the nozzles 310 apply oil to the mold 930. After oiling, the transport robot 900 removes the mold 930 from the spray chamber.

[0043] Furthermore, the spraying chamber is also equipped with a rotary table, on which the mold 930 is placed, thereby ensuring that the nozzle 310 can spray oil evenly onto the surface of the mold 930. In addition, the spraying equipment 300 may also include a flipping fixture or a flipping robot, thereby ensuring that the mold 930 can be flipped over to guarantee that oil spraying is achieved.

[0044] In some embodiments, the mold storage unit also includes a preheating device 200, with a walking track 910 extending to the preheating device 200. During the unloading process, the handling robot 900 can first transfer the mold 930 from the mold rack 600 to the preheating device 200 to preheat the mold 930 before continuing to pick up the mold 930 for subsequent unloading operations. Preheating the mold 930 allows for a more uniform temperature distribution, facilitating uniform flow of the melt within the mold cavity. This avoids problems such as uneven filling, localized overcooling or overheating caused by temperature differences, reducing defects such as bubbles, flow marks, and deformation in the product, and improving the dimensional accuracy and surface quality of the product. Furthermore, automatic preheating of the mold 930 by the preheating device 200 avoids the safety hazards associated with manual baking of the mold 930. Specifically, the preheating device 200 can use non-contact high-frequency heating for the mold 930 and uses an infrared sensor for real-time temperature measurement, thereby accurately raising the mold 930 to a preset temperature for use with on-site equipment. Non-contact high-frequency heating is a technology that uses the electromagnetic induction phenomenon generated when high-frequency current passes through a conductor to convert electrical energy into heat energy, thereby achieving heating.

[0045] Combination Figure 3 and Figure 6The aforementioned sandblasting equipment 400, oil spraying equipment 300, and preheating equipment 200 are all equipped with corresponding display screens 101, facilitating on-site display of the operating status of each device and parameter adjustment. Furthermore, in the event of a malfunction, fault information automatically appears on the display screen 101, providing a fault warning. Additionally, to enhance safety, the handling robot 900 automatically pauses its operation when any device malfunctions, ensuring the safety of maintenance personnel.

[0046] To facilitate the management of incoming molds 930, the mold warehouse also includes a barcode scanning device 700 for scanning the molds 930. Accordingly, a corresponding QR code needs to be set on each mold 930. Before the mold 930 is put into storage, it is first scanned at the barcode scanning device 700, and then it undergoes subsequent sandblasting and painting treatment.

[0047] To facilitate the entry and exit of molds 930, the mold storage unit also includes a transport trolley 800. The transport trolley 800 is used to transport molds 930 and to facilitate the handover of molds 930 to the handling robot 900. Specifically, the transport trolley 800 can be an AGV (Automated Guided Vehicle), equipped with an automatic guidance system that allows it to automatically travel along a predetermined route, transporting molds 930 from their starting point to their destination. Specifically, upon entry, the transport trolley 800 transports finished molds 930 to the handling robot 900; upon exit, the transport trolley 800 transports molds 930 retrieved from the handling robot 900 to their intended use.

[0048] To facilitate charging of the transport trolley 800, the mold vertical warehouse also includes charging equipment for charging the transport trolley 800.

[0049] The mold storage unit also includes a fence that encloses the working area. A handling robot 900, a travel track 910, a sandblasting device 400, a painting device 300, a main control cabinet 100, and a mold rack 600 are all located within this working area. The travel track 910 extends in a straight line, and along its direction, the working area includes an auxiliary equipment area and a mold storage area arranged sequentially. The sandblasting device 400, the painting device 300, and the main control cabinet 100 are located in the auxiliary equipment area, while the mold rack 600 is located within the mold storage area. The fence can be made of glass and equipped with an electric gate for automatic opening when the transport trolley 800 enters or exits.

[0050] The preheating device 200 is also located in the auxiliary equipment area. Within this area, the main control cabinet 100, preheating device 200, spraying device 300, and sandblasting device 400 can be positioned on the same or different sides of the travel track 910. This application does not restrict the specific location of each device within the auxiliary equipment area. Multiple mold racks 600 are arranged around the outer periphery of the travel track 910. For example, the multiple mold racks 600 can be arranged in a C-shape around the travel track 910 to facilitate direct gripping of the mold 930 by the handling robot 900. The mold racks 600 can be customized according to the warehouse volume and the size of the mold 930; this embodiment does not impose such restrictions.

[0051] The handling robot 900 includes a robotic arm 901 and a gripper 902. The base of the robotic arm 901 is slidably mounted on a travel track 910. The gripper 902 is located at the end of the robotic arm 901 and is used to grasp a mold 930. Figure 7 and Figure 8 A slide block 920 is slidably mounted on the walking track 910. The slide block 920 can be driven by a hydraulic system to slide on the walking track 910. The base of the handling robot 900 can be fixedly connected to the slide block 920 and slide synchronously with the slide block 920 on the walking track 910.

[0052] Combination Figure 9 The fixture 902 is provided with two grippers, and the sidewalls of the two grippers facing each other are provided with buffer pads 903 for fitting with the mold 930 to avoid damaging the mold 930. The fixture 902 can be pneumatically controlled.

[0053] The mold automated storage and retrieval system disclosed in this application can automatically complete the transfer, preheating, cleaning, and rust prevention of molds 930, and can also achieve unattended automatic warehousing, greatly improving the management efficiency of molds 930. The mold automated storage and retrieval system disclosed in this application can be used in conjunction with management systems such as CAPP (Computer Aided Process Planning), MOM (Manufacturing Operation Management), WMS (Warehouse Management System), and WCS (Warehouse Control System). Through these systems, the usage cycle and status changes of each mold 930 can be accurately tracked, and in-depth data statistics and analysis can be performed. Specifically, CAPP can provide standardized mold 930 data, the MOM system can automatically match and assign the most suitable mold 930 according to work orders, and the mold automated storage and retrieval system is responsible for accurately executing the automatic inbound and outbound tasks of molds 930, thereby realizing the full-process digitalization of mold 930 management and possessing comprehensive mold 930 quality traceability capabilities.

[0054] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed. Additionally, in the description of embodiments in this application, "a plurality of" means two or more.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mold vertical storage unit, characterized in that, It includes a sandblasting device (400), an oil spraying device (300), a mold rack (600), and a main control cabinet (100). The sandblasting device (400) is used to sandblast the mold (930), the oil spraying device (300) is used to spray the mold (930) with oil, and the mold rack (600) is provided with multiple storage stations for storing the mold (930). The mold storage unit also includes a walking track (910) extending to the sandblasting equipment (400), the oil spraying equipment (300), and the mold rack (600), as well as a slidable transport robot (900) mounted on the walking track (910), the transport robot (900) being used to transport molds (930). The handling robot (900), the sandblasting equipment (400), and the oil spraying equipment (300) are all controlled by the main control cabinet (100).

2. The mold vertical storage unit as described in claim 1, characterized in that, The mold storage unit also includes a dust removal device (500) for collecting dust generated by the sandblasting equipment (400).

3. The mold vertical storage unit as described in claim 1, characterized in that, The mold storage unit also includes a preheating device (200) for preheating the mold (930), and the walking track (910) extends to the preheating device (200).

4. The mold vertical storage unit as described in claim 1, characterized in that, The mold storage unit also includes a barcode scanning device (700) for scanning the mold (930), and the walking track (910) extends to the barcode scanning device (700).

5. The mold vertical storage unit as described in claim 1, characterized in that, The oil injection device (300) includes an injection chamber, a nozzle (310), an oil reservoir, and a heating component. The nozzle (310) is disposed in the injection chamber and communicates with the oil reservoir. The heating component is used to heat the oil reservoir.

6. The mold vertical storage unit as described in claim 1, characterized in that, The mold storage unit also includes a transport trolley (800) and a charging device. The transport trolley (800) is used to transport molds (930) and to hand over the molds (930) to the handling robot (900). The charging device is used to charge the transport trolley (800).

7. The mold vertical storage unit as described in claim 1, characterized in that, The mold storage unit also includes a fence that encloses a working area. The handling robot (900), the walking track (910), the sandblasting equipment (400), the spraying equipment (300), the main control cabinet (100), and the mold rack (600) are all located within the working area. The walking track (910) extends in a straight line, and along the extension direction of the walking track (910), the working area includes an auxiliary equipment area and a mold storage area arranged in sequence. The sandblasting equipment (400), the oil spraying equipment (300) and the main control cabinet (100) are all located in the auxiliary equipment area, and the mold material rack (600) is located in the mold storage area.

8. The mold vertical storage unit as described in claim 1, characterized in that, The sandblasting equipment (400), the oil spraying equipment (300), and the main control cabinet (100) are located on the same side or different sides of the walking track (910); There are multiple mold racks (600) arranged around the outer periphery of the travel track (910).

9. The mold vertical storage unit as described in claim 1, characterized in that, The handling robot (900) includes a robotic arm (901) and a gripper (902). The base of the robotic arm (901) is slidably mounted on the walking track (910) via a slide (920). The gripper (902) is located at the end of the robotic arm (901) and is used to grip the mold (930).

10. The mold vertical storage unit as described in claim 9, characterized in that, The clamp (902) is provided with two grippers, and the sidewalls of the two grippers facing each other are provided with buffer pads (903) for fitting with the mold (930).