Air tightness detection equipment for product

Abstract

The utility model provides air tightness detection equipment for a product, which comprises at least one group of pressure maintaining detection devices, and each group of pressure maintaining detection devices comprises a plurality of groups of upper dies and lower dies which are arranged in pairs; the upper mold and / or the lower mold are / is driven to be closed or opened, a closed cavity used for containing a product to be detected is formed between the upper mold and the lower mold in the closed state, an air injection channel is connected to the closed cavity, and a pressure sensor used for detecting the real-time air pressure value in the cavity in real time is arranged in the closed cavity; the device further comprises a feeding conveying line body and a discharging conveying line body, the feeding conveying line body is arranged corresponding to the feeding position of the pressure maintaining detection device, and the discharging conveying line body is arranged corresponding to the discharging position of the pressure maintaining detection device. According to the utility model, a plurality of products can be detected at the same time; and the loading conveying line body and the unloading conveying line body can be communicated with other equipment of the automatic production line of the products, so that the turnover time of the products is saved, and the detection efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automated detection, in particular to an air-tightness detection device for a product. The detection device can be applied to the air-tightness detection of products in the battery manufacturing industry, the automobile manufacturing industry and the air-conditioning manufacturing industry. Background Art

[0002] Air tightness testing refers to a test method for detecting the sealing performance of objects or equipment. It is generally used to ensure that sealed equipment, containers or pipelines do not leak gas and lose pressure under normal operating conditions. The current air tightness testing process is used in a variety of fields. For example, lithium batteries in the battery manufacturing industry need to test the sealing performance of battery covers, the automobile manufacturing industry needs to test the sealing performance of engine cylinder heads, and the air-conditioning manufacturing industry needs to test the air tightness of cooling systems.

[0003] At present, the common method for testing the air tightness of products includes atmospheric testing, which is widely used due to its advantages such as low testing cost and convenient operation. However, the existing method of testing the air tightness of products using atmospheric testing has the following problems: it cannot be linked with other upstream and downstream equipment in the same system, thereby affecting the overall processing efficiency of the product.

[0004] Specifically, taking lithium battery products as an example, lithium batteries mainly include the following parts: a battery cell obtained by winding the positive electrode sheet, isolation film, and negative electrode sheet stacked in sequence, a shell mounted on the outside of the battery cell, a battery cover located on the top of the shell, and the positive and negative poles welded on the mounting holes of the battery cover.

[0005] Since lithium batteries contain a large amount of chemical substances, a large amount of mixed gas will be generated during the battery charging and discharging process, causing pressure to accumulate inside the battery. If this pressure is not released in time, the battery will explode. In order to prevent the battery from exploding, the pressure accumulated inside the battery needs to be released. The most common measure is to set a safety protection device on the battery top cover. At present, the common safety protection device is to punch a longitudinal through hole on the battery top cover and then weld an explosion-proof plate.

[0006] However, due to the pinholes, broken welds, and damaged explosion-proof valves that are prone to occur after welding between the cover pole and the explosion-proof plate, the battery cover cannot be completely sealed, and the chemical substances in the lithium battery leak from the damaged gaps, resulting in a high scrap rate and failure to meet the requirements of use. In order to ensure the quality of lithium batteries, the battery cover needs to be tested for airtightness.

[0007] The existing air tightness test for battery covers is usually carried out by performing helium testing after the pole, burst valve and lower plastic are welded. However, in some application scenarios, after the lower plastic is welded, the gap between the lower plastic and the pole is too small. When using helium testing, it may be difficult for helium to penetrate into the weld in a short time. Therefore, when performing air tightness testing on the battery cover, it is necessary to perform an initial inspection before the lower plastic is installed, that is, helium testing, and re-inspection after the lower plastic is welded. However, helium testing is expensive. If helium testing is used for both the initial inspection and the re-inspection, on the one hand, the testing cost is high; on the other hand, the traditional helium testing equipment has a low degree of automation and has low linkage with other equipment in the automated production line of the battery cover, which requires increasing the turnover time of the battery cover, thereby limiting the detection efficiency of the battery cover.

[0008] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a topic to be studied and solved in the present invention. Summary of the invention

[0009] The utility model aims to provide an air tightness detection device for a product.

[0010] In order to achieve the above-mentioned purpose, the utility model provides an airtightness detection equipment for a product, comprising at least one group of pressure-maintaining detection devices, one or more groups of pressure-maintaining detection devices comprising multiple groups of upper molds and lower molds arranged in pairs; the upper mold and / or the lower mold are driven to close or open, and in the closed state, a closed cavity for accommodating the product to be detected is formed between the two, the closed cavity is connected to an air injection channel, and a pressure sensor for real-time detection of the real-time air pressure value in the cavity is provided in the closed cavity; it also includes a loading and unloading transport line body and a unloading transport line body, the loading and unloading transport line body is arranged corresponding to the loading position of the pressure-maintaining detection device, and the unloading and unloading transport line body is arranged corresponding to the unloading position of the pressure-maintaining detection device; wherein, the loading and unloading transport line body has a plurality of first bearing structures for carrying the product to be detected, and the unloading and unloading transport line body has a plurality of second bearing structures for carrying the detected product.

[0011] A further technical solution also includes a frame, which has a detection space for air tightness detection. At least one group of the pressure maintaining detection devices is located in the detection space, and the loading and unloading transport line body and the unloading transport line body are respectively arranged corresponding to the entrance and exit of the detection space.

[0012] According to a further technical solution, the loading and transporting line, the pressure-maintaining detection device and the unloading and transporting line are arranged in parallel and spaced apart in the X-axis direction, and all three extend along the Y-axis direction.

[0013] A further technical solution also includes a first gripping mechanism for moving the product to be tested into the pressure-maintaining testing device and a second gripping mechanism for moving the tested product out of the pressure-maintaining testing device. The first gripping mechanism and the second gripping mechanism are both arranged corresponding to the pressure-maintaining testing device.

[0014] According to a further technical solution, both the first gripping mechanism and the second gripping mechanism extend along the Y-axis direction and are movably arranged in the X-axis direction and the Z-axis direction.

[0015] A further technical solution also includes two groups of material moving modules, namely a first material moving module for moving the products to be inspected to the loading material transport line, and a second material moving module for moving the qualified products that have been inspected out of the unloading material transport line to the downstream equipment. The two groups of material moving modules are respectively arranged corresponding to the inlet of the loading material transport line and the outlet of the unloading material transport line.

[0016] According to a further technical solution, each material moving module includes at least one material picking module, and also includes a translation module for driving the material picking module to make linear motion along the X-axis direction, a lifting module for driving the material picking module to make linear motion along the Z-axis direction, and a rotation module for driving the material picking module to make rotational motion around the Z-axis direction.

[0017] According to a further technical solution, the number of the material taking modules is greater than one, and each material moving module further comprises a variable pitch module, wherein the variable pitch module has a driving part for driving the plurality of the material taking modules to perform expansion or retraction actions.

[0018] A further technical solution also includes a defective product collection module, which includes a defective product grabbing mechanism, a defective product transport line and a defective product collecting device; the defective product grabbing mechanism is arranged corresponding to the outlet of the unloading transport line, and is used to move the defective products that have been detected as unqualified from the unloading transport line to the defective product transport line; the defective product collecting device is arranged corresponding to the end of the defective product transport line, and is used to collect the defective products on the defective product transport line.

[0019] According to a further technical solution, the defective product collection device comprises a collection bracket, a lifting structure and at least two check parts, the collection bracket having a accommodating cavity for accommodating the defective products; at least two check parts are arranged at the bottom of the collection bracket, and a limiting member for limiting the downward movement of each check part is arranged below the check part, so that a one-way channel for the defective products to move upward is formed between at least two of the check parts, and the one-way channel is arranged corresponding to the accommodating cavity; the lifting structure is located below the one-way channel, and when the defective products move to the top of the lifting structure, the lifting structure moves upward and pushes the defective products to move along the one-way channel into the accommodating cavity.

[0020] The working principle and advantages of this utility model are as follows:

[0021] The air tightness detection equipment of the product provided in the utility model includes at least one group of pressure-maintaining detection devices, and one or more groups of pressure-maintaining detection devices include multiple groups of upper molds and lower molds arranged in pairs, which can achieve the purpose of simultaneously detecting multiple products, thereby improving the detection efficiency; and the setting of the loading and unloading transport line body can be connected to other equipment in the product's automated production line. Specifically, the loading and unloading transport line body can correspond to the discharge of the upstream process equipment, and the unloading transport line body can correspond to the input of the downstream process equipment, thereby saving the product turnover time and thereby improving the product's air tightness detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 ~Attached Figure 2 This is an overall diagram of the fully automatic air tightness detection equipment for the product of the embodiment of the utility model;

[0023] Attached Figure 3 A side view of an airtightness detection device for a product according to an embodiment of the utility model;

[0024] Attached Figure 4 It is a structural schematic diagram of the framework of an embodiment of the utility model;

[0025] Attached Figure 5 This is a schematic structural diagram of a first material moving module and a second material moving module according to an embodiment of the utility model;

[0026] Attached Figure 6 It is a structural schematic diagram of a loading and unloading transport line body and a unloading and transport line body of an embodiment of the utility model;

[0027] Attached Figure 7 This is a structural schematic diagram of a lifting and positioning assembly according to an embodiment of the utility model;

[0028] Attached Figure 8 This is a schematic structural diagram of the lower mold of an embodiment of the utility model;

[0029] Attached Fig. 9 This is a schematic structural diagram of an upper mold according to an embodiment of the utility model;

[0030] Attached Fig.10 This is a schematic diagram of the structure of a defective product collection module according to an embodiment of the utility model;

[0031] Attached Fig.11 This is a schematic structural diagram of a defective product collection device according to an embodiment of the utility model;

[0032] In the above attached figure:

[0033] 1-frame; 2-pressure-maintaining detection device; 3-loading transport line; 4-unloading transport line; 7-defective product collection module;

[0034] 11-first grasping mechanism; 12-second grasping mechanism; 13-detection space;

[0035] 131-entrance; 132-exit;

[0036] 21-upper mold; 22-lower mold; 23-gas injection channel; 24-pressure sensor; 25-solenoid valve;

[0037] 31- first bearing structure;

[0038] 41- second bearing structure;

[0039] 51-lifting positioning assembly; 52-side positioning assembly;

[0040] 61-first material moving module; 62-second material moving module; 63-translation module; 64-lifting module; 65-rotation module; 66-variable distance module; 67-material taking module;

[0041] 71-defective product transport line; 72-defective product collection device;

[0042] 721-collecting bracket; 722-lifting structure; 723-check part;

[0043] 7211-Accommodation chamber. DETAILED DESCRIPTION

[0044] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0045] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0046] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0047] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0048] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0049] The words “include,” “including,” and “have” used in this document are open-ended terms, meaning including but not limited to.

[0050] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0051] The terms "front", "back", "up", "down", "left", "right", etc. used in this article are all directional terms. In this case, they are only used to illustrate the positional relationship between the various structures, and are not used to limit the protection plan of this case and the specific direction during actual implementation.

[0052] The present embodiment provides an airtightness detection device for a product, which is used to detect the sealing performance of a product (battery cover) to ensure that gas leakage and pressure loss do not occur when the product is in working condition. For ease of explanation, the present embodiment will take the airtightness detection of the battery cover as an example to further explain in detail the structure and principle of the airtightness detection device for the product of the present embodiment.

[0053] See attached Figure 1 ~Attached Figure 3 The air tightness detection equipment of the product includes at least one group of pressure-maintaining detection devices 2, one or more groups of pressure-maintaining detection devices 2 are located inside the detection space 13, and one or more groups of pressure-maintaining detection devices 2 include multiple groups of upper molds 21 and lower molds 22 arranged in pairs, the upper mold 21 and / or the lower mold 22 are driven to close or open, and in the closed state, a closed cavity for accommodating the product to be detected is formed between the two, the closed cavity is connected to an air injection channel 23, and a pressure sensor 24 for real-time detection of the air pressure value in the cavity is provided in the closed cavity.

[0054] Optionally, when the number of pressure-maintaining detection devices 2 in the air-tightness detection equipment of the product is one, the pressure-maintaining detection device 2 includes multiple groups of upper molds 21 and lower molds 22 arranged in pairs; when the number of pressure-maintaining detection devices 2 in the air-tightness detection equipment of the product is greater than one, the pressure-maintaining detection device 2 may include one or more groups of upper molds 21 and lower molds 22 arranged in pairs.

[0055] This embodiment also includes a loading and transporting line 3 and a unloading and transporting line 4, and the loading and transporting line 3 is arranged corresponding to the loading position of the pressure-maintaining detection device 2, and the unloading and transporting line 4 is arranged corresponding to the unloading position of the pressure-maintaining detection device 2; wherein, the loading and transporting line 3 has a plurality of first bearing structures 31 for bearing the battery cover plates to be detected, and the unloading and transporting line 4 has a plurality of second bearing structures 41 for bearing the battery cover plates that have been detected.

[0056] For the air tightness test of the battery cover, helium test is generally used. However, as described in the background technology, in some application scenarios, re-inspection is required to further ensure that the air tightness of the battery cover is in a qualified state. In this embodiment, the air tightness test equipment of this product is used to re-inspect the battery cover. The test cost is lower than the test cost required for the two-step helium test method. In addition, since the air tightness test equipment of this product has good linkage with other equipment in the battery cover automated production line, it can reduce the turnover time of the battery cover and further improve the detection efficiency of the battery cover.

[0057] like Figure 4 As shown, the air tightness testing equipment of the product also includes a frame 1, which has a testing space 13, and at least one group of pressure-maintaining testing devices 2 is located in the testing space 13. Optionally, the frame 1 can be formed by connecting multiple connecting rods.

[0058] The detection space 13 has an entrance and an exit. Furthermore, in order to realize the transfer action of the battery cover at the entrance of the detection space 13 and the exit of the detection space 13, preferably, the airtightness detection equipment of the product in this embodiment also includes two sets of material moving modules, namely a first material moving module 61 for moving the battery cover to be inspected to the loading conveying line 3, and a second material moving module 62 for moving the qualified good products out of the unloading conveying line 4 to the downstream equipment. The two sets of material moving modules correspond to the entrance of the loading conveying line 3 and the exit of the unloading conveying line 4, respectively.

[0059] For details, see Figure 5 The material moving module includes at least one material picking module 67, each material picking module 67 corresponding to grabbing a battery cover, and optionally, the material picking module 67 includes a suction cup or a clamp. The material moving module also includes a translation module 63 for driving the material picking module 67 to make a linear motion along the X-axis direction, a lifting module 64 for driving the material picking module 67 to make a linear motion along the Z-axis direction, and a rotation module 65 for driving the material picking module 67 to make a rotational motion around the Z-axis direction. Therefore, the first material moving module 61 can grab the battery cover and place it at a suitable position on the loading conveying line 3 for subsequent transportation and inspection; similarly, the second material moving module 62 can also grab the battery cover located at a specific position on the unloading conveying line 4 and transfer it to the downstream equipment.

[0060] Furthermore, the number of the material taking modules 67 is greater than one. At this time, it is necessary to adjust the distance between the two adjacent material taking modules 67 according to the distance between the two adjacent first bearing structures 31 on the material loading and transporting line body 3 or according to the distance between the two adjacent second bearing structures 41 on the material unloading and transporting line body 4, so as to adapt to the position of the battery cover plate and accurately grab the battery cover plate. In this embodiment, the material moving module also includes a variable distance module 66, and the variable distance module 66 has a driving part for driving multiple material taking modules 67 to expand or retract, so as to drive at least two material taking modules 67 to produce displacements of different sizes in the X-axis direction, which is used to change the distance between the two adjacent material taking modules 67 in the X-axis direction. It can be understood that the above-mentioned "expansion" action is to increase the distance between the two adjacent material taking modules 67 in the X-axis direction, and the above-mentioned "retraction" action is to reduce the distance between the two adjacent material taking modules 67 in the X-axis direction.

[0061] In a specific implementation manner, there are two material picking modules 67, namely a first material picking module and a second material picking module, and the two material picking modules are movably arranged on a guide rail along the Y-axis direction; the variable distance module 66 includes a first driving part and a second driving part, and optionally, the two driving parts are cylinders, and the first driving part and the second driving part respectively provide driving force for the movement of the first material picking module and the second material picking module, and when the two material picking modules perform an expansion movement, the first driving part and the second driving part respectively drive the first material picking module and the second material picking module to perform a divergent movement with a gradually increasing distance between them; when the two material picking modules perform a retracting movement, the first driving part and the second driving part respectively drive the first material picking module and the second material picking module to perform a toward each other movement with a gradually decreasing distance between them.

[0062] In another specific embodiment, the number of the material picking modules 67 is two, namely the first material picking module and the second material picking module. The first material picking module is movably arranged on a guide rail along the Y-axis direction, and the second material picking module is fixedly arranged on the guide rail; the variable distance module 66 includes a driving part that provides driving force for the movement of the first material picking module. Optionally, the driving part includes a cylinder. When the two material picking modules make an expansion movement, the second material picking module is fixed, and the first material picking module moves away from the second material picking module to increase the distance between the two material picking modules; when the two material picking modules make a retraction movement, the second material picking module is fixed, and the first material picking module moves towards the second material picking module to reduce the distance between the two material picking modules.

[0063] Regarding the operation mode of the translation module 63, the lifting module 64, and the rotation module 65 driving the material picking module 67 to move linearly or rotate, ordinary technicians in this field can make conventional settings based on the existing technology. This embodiment has no special requirements for its operation mode and usage, so it is not described in detail in this embodiment.

[0064] In this embodiment, the loading and unloading transport line 3 and the unloading transport line 4 are respectively arranged corresponding to the entrance and the exit of the above-mentioned detection space 13. Optionally, the loading and unloading transport line 3 and the unloading transport line 4 can be located inside the detection space 13. In other optional implementations, the loading and unloading transport line 3 and the unloading transport line 4 can be located outside the detection space 13; wherein, the loading and unloading transport line 3 is used to transport the battery cover to be inspected into the detection space 13 for air-tightness inspection, and the unloading transport line 4 is used to transport the battery cover after inspection to the outside of the detection space 13, thereby reflecting the good systematicness of the air-tightness inspection equipment of the product provided in this embodiment.

[0065] The loading conveying line 3, the pressure-maintaining detection device 2 and the unloading conveying line 4 are sequentially arranged in parallel and at intervals in the X-axis direction, and all three extend along the Y-axis direction.

[0066] Optionally, a sensor device is provided on the loading and unloading transport line 3 and the unloading transport line 4, which is used to sense whether the first bearing structure 31 and the second bearing structure 41 on the loading and unloading transport line 3 and the unloading transport line 4 are both carrying battery cover plates. If so, the loading and unloading transport line 3 and the unloading transport line 4 stop the transport action.

[0067] It can be understood that the transport directions of the loading transport line 3 and the unloading transport line 4 can be the same or different, and can be specifically set according to the relative position relationship between other mechanisms or equipment. This embodiment does not limit this, and technical personnel in this field can make specific limitations on the transport directions of the two groups of transport lines based on actual conditions.

[0068] Optional, see Figure 6 and Figure 7 A lifting positioning assembly 51 and a side positioning assembly 52 are also provided on the feeding and transporting line body 3. The two positioning assemblies are used to limit the position of the battery cover in the bearing structure so as to improve the accuracy of the subsequent grasping and moving of the moving parts.

[0069] like Figure 6 The side positioning components 52 are arranged in pairs on both sides of the loading and conveying line 3. When the battery cover moves to the side positioning components 52 along with the loading and conveying line 3, the sensor corresponding to the side positioning components 52 senses the battery cover and triggers the side positioning components 52 to extend a limiter, which contacts the battery cover to limit the position of the battery cover to prevent tilting.

[0070] Please continue to see Figure 7In general working scenarios, the belt of the feeding and transporting line 3 may fluctuate, which is not conducive to the subsequent grabbing of the battery cover. Therefore, the lifting and positioning assembly 51 is required to lift the battery cover to a certain height before the moving part grabs it, so that the battery cover is separated from the belt of the feeding and transporting line 3 to improve the accuracy of the subsequent grabbing of the battery cover.

[0071] In this embodiment, the lifting and positioning assembly 51 includes a lifting member and a cylinder. When the transport line body is in a transport state, the lifting member is in a non-contact state with the bearing structure, or is in contact with the bearing structure but does not provide a lifting force to the lifting member. When the transport line body is in a stationary state, the cylinder drives the lifting member to move upward and lift the bearing structure until it is separated from the transport line body. It can be understood that the loading transport line body 3 in this embodiment is only provided with synchronous belts on both sides for transporting the battery cover plate, so the lifting and positioning assembly 51 can directly contact the bearing structure through the middle of the loading transport line body 3 and provide a lifting force to the bearing structure.

[0072] Accordingly, in order to transfer multiple battery cover plates on the transport line at the same time, the present embodiment further includes a first gripping mechanism 11, which is provided corresponding to the pressure-maintaining detection device 2, and is used to move the battery cover plate to be detected to the pressure-maintaining detection device 2, and then the pressure-maintaining detection device 2 performs airtightness detection on the battery cover plate to be detected. The first gripping mechanism 11 and the second gripping mechanism 12 also include structures with gripping functions such as grippers, manipulators, and suction cups.

[0073] like Figure 8 and Fig. 9 As shown, in this embodiment, the first gripping mechanism 11 moves the battery cover to be tested to the lower mold 22 in the pressure-maintaining testing device 2, and then the upper mold 21 is driven by the cylinder to descend to cover the lower mold 22. At this time, a closed cavity is formed between the upper mold 21 and the lower mold 22, and the battery cover is tested for air tightness in the closed cavity; it can be understood that during the testing process, Fig.10 As shown, the battery cover is placed in the closed cavity, and the closed cavity is divided into an upper cavity and a lower cavity that are sealed to each other; wherein the upper cavity is the space formed between the battery cover and the upper mold 21, and the lower cavity is the space formed between the battery cover and the lower mold 22.

[0074] The sealed cavity is connected to a gas injection channel 23, through which gas is provided to the sealed cavity to make the upper cavity or the lower cavity reach a predetermined pressure. The sealed cavity is also provided with a pressure sensor 24 for real-time detection of the air pressure value in the cavity.

[0075] In a specific implementation, the gas injection channel 23 is connected to the lower mold 22, and gas is continuously injected into the lower cavity through the gas injection channel 23 to promote the gas pressure value in the lower cavity to reach the above-mentioned predetermined pressure. When the pressure sensor 24 is located in the lower cavity, if the battery cover leaks, after the lower cavity is inflated and the pressure is maintained for a period of time, it can be observed that the pressure value displayed by the pressure sensor 24 is less than the predetermined pressure; when the pressure sensor 24 is located in the upper cavity, if the battery cover leaks, after the lower cavity is inflated and the pressure is maintained for a period of time, it can be observed that the pressure value of the upper cavity displayed by the pressure sensor 24 increases, that is, the gas in the lower cavity leaks to the upper cavity through the leaking battery cover. In this way, the airtightness of the battery cover can be judged.

[0076] In another specific embodiment, the gas injection channel 23 is connected to the upper mold 21, and gas is continuously injected into the upper cavity through the gas injection channel 23 to cause the air pressure value in the upper cavity to reach the above-mentioned predetermined pressure. When the pressure sensor 24 is located in the lower cavity, if the battery cover leaks, after the upper cavity is inflated and the pressure is maintained for a period of time, it can be observed that the pressure value of the lower cavity displayed by the pressure sensor 24 increases, that is, the gas in the upper cavity leaks to the lower cavity through the leaking battery cover; when the pressure sensor 24 is located in the upper cavity, if the battery cover leaks, after the upper cavity is inflated and the pressure is maintained for a period of time, it can be observed that the air pressure value displayed by the pressure sensor 24 is less than the above-mentioned predetermined pressure. In this way, the air tightness judgment of the battery cover can be realized.

[0077] Optionally, the closed cavity can be filled with gas through the solenoid valve 25. Each closed cavity is connected to a solenoid valve 25. During the detection process, the battery cover can also be detected in a targeted manner.

[0078] Furthermore, in order to avoid leakage of the solenoid valve 25 during the pressure-maintaining test and thus prevent the continuous supply of air to the sealed cavity and thus affect the test result, it is preferred that the corresponding solenoid valve 25 is switched to the exhaust state after the predetermined pressure is reached.

[0079] Optionally, the closed chamber is also equipped with a precision pressure regulating valve to control the air intake pressure, which can be adapted to different detection requirements.

[0080] After the detection is completed, the pressure in the closed cavity is released by separating the upper and lower molds. Of course, in some detection schemes with higher air pressure requirements, a special pressure relief channel, such as an exhaust pipe, can be provided to release the pressure in the closed cavity after the detection. After the pressure is released, the battery cover plate that has completed the detection is moved out of the pressure-maintaining detection device 2. Preferably, the present embodiment also includes a second gripping mechanism 12, which is arranged corresponding to the pressure-maintaining detection device 2, and the second gripping mechanism 12 is used to move the detected product that has completed the detection out of the pressure-maintaining detection device 2.

[0081] Specifically, the first grasping mechanism 11 and the second grasping mechanism 12 both extend in the Y-axis direction and are movably arranged in the X-axis direction and the Z-axis direction. The first grasping mechanism 11 and the second grasping mechanism 12 are movably arranged in the Z-axis direction to be lowered to place the battery cover into the pressure-maintaining detection device 2 for detection, or to be raised to take the detected battery cover out of the pressure-maintaining detection device 2.

[0082] Further, such as Figure 4 As shown, the first grasping mechanism 11 is used to transfer the battery cover from the loading conveying line 3 to the pressure-maintaining detection device 2, and the second grasping mechanism 12 is used to transfer the battery cover from the pressure-maintaining detection device 2 to the unloading conveying line 4, and the transfer action of the first grasping mechanism 11 and the second grasping mechanism 12 can be performed simultaneously. That is to say, after a group of battery cover inspections are completed, the first grasping mechanism 11 transfers the next group of battery cover to be inspected and the second grasping mechanism 12 transfers the battery cover after inspection at the same time, which can effectively improve the inspection efficiency.

[0083] After the pressure-maintaining test is completed, the second gripping mechanism 12 transfers all the battery cover plates located in the pressure-maintaining detection device 2 to the unloading conveying line 4. At this time, the unloading conveying line 4 has battery cover plates detected as good products and battery cover plates detected as defective products. The battery cover plates detected as good products are transferred to the downstream equipment by the material transfer module, and the battery cover plates detected as defective products need to be collected.

[0084] In this embodiment, a defective product collection module 7 is also included, see Fig.11 The defective product collection module 7 includes a defective product grabbing mechanism, a defective product transport line 71 and a defective product collecting device 72; the defective product grabbing mechanism is arranged corresponding to the outlet of the unloading transport line 4, and is used to grab the battery cover plate detected as defective on the unloading transport line 4 and put it onto the defective product transport line 71; the defective product collecting device 72 is arranged corresponding to the end of the defective product transport line 71, and is used to collect defective products on the defective product transport line 71.

[0085] Specifically, the defective product collection device 72 includes a collection bracket 721, a lifting structure 722 and at least two check parts 723. The collection bracket 721 has a receiving cavity 7211 for receiving defective products. At least two check parts 723 are arranged at the bottom of the collection bracket 721. A stopper for limiting the downward movement of each check part 723 is also arranged below each check part 723, so that a one-way channel for the upward movement of defective products is formed between at least two check parts 723. The one-way channel is arranged corresponding to the receiving cavity 7211. The lifting structure 722 is located below the one-way channel. When the defective products move to the top of the lifting structure 722, the lifting structure 722 moves upward and pushes the defective products to move along the one-way channel to the inside of the receiving cavity 7211, thereby completing the collection process of the defective battery cover. Preferably, the lifting structure 722 can be a cylinder.

[0086] Optionally, a sensor is provided on the top of the defective product collection device 72, and an alarm is electrically connected to the sensor. When the alarm sounds an alarm, it proves that the defective product collection device 72 is full and needs to be replaced by a technician. Preferably, there are two defective product collection devices 72 to ensure that when a technician replaces one of the defective product collection devices 72, the equipment can still operate normally without stopping.

[0087] In order to enable the defective product grasping mechanism to accurately grasp the defective products, the present embodiment also includes a control module, which is electrically connected to the pressure sensor 24 in the closed cavity. When the air pressure value sensed by the pressure sensor 24 in a certain closed cavity is abnormal, the battery cover in the closed cavity is judged to be a defective product with unqualified airtightness, and the defective product is marked by counting to track the position of the defective product.

[0088] For example, the pressure-maintaining detection device 2 includes ten pairs of upper molds 21 and lower molds 22 arranged in pairs, which can detect ten battery covers at one time, and the ten pairs of closed cavities are marked as the first group, the second group, the third group... and so on in sequence. Optionally, the position of the first group of closed cavities is closer to the exit of the unloading and transporting line 4; the unloading and transporting line 4 includes ten groups of second bearing structures 41, and the ten groups of second bearing structures 41 correspond to carrying ten battery covers, and the unloading and transporting line 4 is dynamic and stop-advanced, and the distance moved for each forward step is the width of a second bearing structure 41; the defective product grabbing mechanism is arranged at the exit position of the unloading and transporting line 4, that is, at the second bearing structure 41 closer to the exit position of the unloading and transporting line 4, and the above-mentioned control module is electrically connected to the unloading and transporting line 4 and the defective product grabbing mechanism, and the control module determines whether the defective product has reached the defective product grabbing mechanism according to the number of dynamic and stop-advanced times of the unloading and transporting line 4, and if it has arrived, a grabbing signal is sent to the defective product grabbing mechanism.

[0089] After detection, if the battery cover in the second group of sealed cavities is detected as defective, then after the unloading conveying line 4 moves forward once, the control module sends a grabbing signal to the defective grabbing mechanism to grab the defective products at the corresponding position.

[0090] Furthermore, the present embodiment also includes a sensor module, which is arranged together with the defective product grabbing mechanism at the exit position of the unloading transport line 4 for sensing whether there is an object at that position. If not, it means that an accident occurred when the second grabbing mechanism 12 transferred the battery cover to the unloading transport line 4, causing the battery cover to fall off. At this time, the defective product grabbing mechanism / second material transfer module 62 does not need to perform a grabbing action.

[0091] The working process of the existing utility model is as follows:

[0092] The product to be inspected enters the entrance of the inspection space 13 from the upstream equipment through the first material transfer module 61, specifically, on the loading and transporting line body 3 at the entrance. The loading and transporting line body 3 has a plurality of first bearing structures 31 for carrying the product to be inspected and transporting it backwards. When all the first bearing structures 31 on the loading and transporting line body 3 are loaded with products, the backward transport stops.

[0093] The first grabbing mechanism 11 transfers all the products on the feeding and transporting line 3 to the pressure-maintaining detection device 2;

[0094] The pressure-maintaining detection device 2 includes an upper mold 21 and a lower mold 22. When the lower mold 22 carries a product, the upper mold 21 covers the lower mold 22 to form a closed cavity. The product located in the closed cavity separates the closed cavity into an upper cavity and a lower cavity that are closed to each other. The upper mold 21 or the lower mold 22 is connected to a gas injection channel 23. Gas is continuously supplied to the upper cavity or the lower cavity through the gas injection channel 23. After reaching a predetermined pressure, the gas supply is stopped. After maintaining the pressure for a period of time, the pressure of the upper cavity or the lower cavity is sensed by a pressure sensor 24, and it is determined whether the air tightness of the corresponding product meets the standard.

[0095] For example, the gas injection channel 23 is connected to the lower mold 22, and gas is continuously injected into the lower cavity through the gas injection channel 23 to cause the air pressure value in the lower cavity to reach the above-mentioned predetermined pressure. When the pressure sensor 24 is located in the lower cavity, if the battery cover leaks, after the lower cavity is inflated and the pressure is maintained for a period of time, it can be observed that the pressure value displayed by the pressure sensor 24 is less than the predetermined pressure; when the pressure sensor 24 is located in the upper cavity, if the battery cover leaks, after the lower cavity is inflated and the pressure is maintained for a period of time, it can be observed that the pressure value of the upper cavity displayed by the pressure sensor 24 increases, that is, the gas in the lower cavity leaks to the upper cavity through the leaking battery cover.

[0096] For another example, the gas injection channel 23 is connected to the upper mold 21, and gas is continuously injected into the upper cavity through the gas injection channel 23 to promote the gas pressure value in the upper cavity to reach the above-mentioned predetermined pressure. When the pressure sensor 24 is located in the lower cavity, if the battery cover leaks, after the upper cavity is inflated and the pressure is maintained for a period of time, it can be observed that the pressure value of the lower cavity displayed by the pressure sensor 24 increases, that is, the gas in the upper cavity leaks to the lower cavity through the leaking battery cover; when the pressure sensor 24 is located in the upper cavity, if the battery cover leaks, after the upper cavity is inflated and the pressure is maintained for a period of time, it can be observed that the gas pressure value displayed by the pressure sensor 24 is less than the above-mentioned predetermined pressure. In this way, the airtightness of the battery cover can be judged.

[0097] After the detection, the pressure in the closed cavity is released, and then the second gripping mechanism 12 transfers the product on the pressure-maintaining detection device 2 to the unloading transport line 4. The unloading transport line 4 carries good products and defective products. The good products are transferred to the downstream equipment by the second material transfer module 62, and the defective products are collected by the defective product collection module 7, thus completing the entire detection process.

[0098] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A product air tightness detection device, characterized in that: It comprises at least one set of pressure-maintaining detection devices (2), wherein one or more sets of the pressure-maintaining detection devices (2) comprise a plurality of sets of upper molds (21) and lower molds (22) arranged in pairs; The upper mold (21) and / or the lower mold (22) are driven to close or open, and in the closed state, a closed cavity for accommodating the product to be tested is formed between the two, the closed cavity is connected to an air injection channel (23), and a pressure sensor (25) for real-time detection of the air pressure value in the cavity is provided in the closed cavity; It also comprises a loading transport line (3) and a unloading transport line (4), wherein the loading transport line (3) is arranged corresponding to the loading position of the pressure-maintaining detection device (2), and the unloading transport line (4) is arranged corresponding to the unloading position of the pressure-maintaining detection device (2); The loading transport line (3) has a plurality of first bearing structures (31) for bearing products to be inspected, and the unloading transport line (4) has a plurality of second bearing structures (41) for bearing inspected products.

2. The air tightness detection device for a product according to claim 1, characterized in that: The invention also comprises a frame (1), wherein the frame (1) has a detection space (13) for performing air tightness detection, at least one set of the pressure-maintaining detection devices (2) is located in the detection space (13), and the loading and unloading transport line (3) and the unloading and unloading transport line (4) are respectively arranged corresponding to the entrance and exit of the detection space (13).

3. The air tightness detection device for a product according to claim 1, characterized in that: The loading conveying line (3), the pressure-maintaining detection device (2) and the unloading conveying line (4) are arranged in parallel and spaced apart in the X-axis direction, and all three extend in the Y-axis direction.

4. The air tightness detection device for a product according to claim 1, characterized in that: It also comprises a first gripping mechanism (11) for moving the product to be tested into the pressure-maintaining testing device (2) and a second gripping mechanism (12) for moving the tested product out of the pressure-maintaining testing device (2), wherein the first gripping mechanism (11) and the second gripping mechanism (12) are both arranged corresponding to the pressure-maintaining testing device (2).

5. The airtightness detection device for a product according to claim 4, characterized in that: The first gripping mechanism (11) and the second gripping mechanism (12) both extend along the Y-axis direction and are movably arranged in the X-axis direction and the Z-axis direction.

6. The air tightness testing device for a product according to claim 1, characterized in that: It also includes two sets of material moving modules (6), namely a first material moving module (61) for moving the product to be inspected to the loading material transport line (3), and a second material moving module (62) for moving the qualified products that have been inspected out of the unloading material transport line (4) to the downstream equipment. The two sets of material moving modules are respectively arranged corresponding to the inlet of the loading material transport line (3) and the outlet of the unloading material transport line (4).

7. The airtightness detection device for a product according to claim 6, characterized in that: Each material moving module comprises at least one material picking module (67), and also comprises a translation module (63) for driving the material picking module (67) to perform linear motion along the X-axis direction, a lifting module (64) for driving the material picking module (67) to perform linear motion along the Z-axis direction, and a rotation module (65) for driving the material picking module (67) to perform rotational motion around the Z-axis direction.

8. The airtightness detection device for a product according to claim 7, characterized in that: The number of the material taking modules (67) is greater than one, and each material moving module further comprises a variable pitch module (66), wherein the variable pitch module (66) has a driving part for driving the plurality of material taking modules (67) to perform expansion or retraction actions.

9. The air tightness detection device for a product according to claim 1, characterized in that: It also includes a defective product collection module (7), wherein the defective product collection module (7) includes a defective product grabbing mechanism, a defective product transport line (71) and a defective product collection device (72); The defective product grabbing mechanism is arranged corresponding to the outlet of the unloading transport line (4), and is used to move defective products that have been detected as unqualified from the unloading transport line (4) to the defective product transport line (71); The defective product collecting device (72) is arranged corresponding to the end of the defective product transport line (71), and is used to collect the defective products on the defective product transport line (71).

10. The air tightness detection device for a product according to claim 9, characterized in that: The defective product collecting device (72) comprises a collecting bracket (721), a lifting structure (722), and at least two non-return parts (723); The collecting bracket (721) has a receiving cavity (7211) for receiving the defective products; At least two check parts (723) are arranged at the bottom of the collecting bracket (721), and a limiting member for limiting the downward movement of each check part (723) is arranged below each check part (723), so that a one-way channel for the defective products to move upward is formed between at least two check parts (723), and the one-way channel is arranged corresponding to the accommodating cavity (7211); The lifting structure (722) is located below the one-way channel, and when the defective product moves to above the lifting structure (722), the lifting structure (722) moves upward and pushes the defective product to move along the one-way channel into the accommodating cavity (7211).

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