Double-arm clamping device and selective wave soldering equipment

Abstract

The utility model provides a double-arm clamping device and selective wave-soldering equipment, and relates to the technical field of selective wave-soldering equipment, and the double-arm clamping device is characterized by comprising two overhanging arms which are arranged in parallel at an interval, the clamping part is located between the two overhanging arms, the power part drives the clamping part to move on the overhanging arms in the overhanging direction, one end of the clamping part is close to the fixed ends of the overhanging arms, and the other opposite end of the clamping part is far away from the fixed ends of the overhanging arms; the end, close to the fixed ends of the two overhanging arms, of the clamping part is arranged on the two overhanging arms in a sliding mode, and the end, away from the fixed ends of the overhanging arms, of the clamping part is arranged in a suspended mode, so that the clamping part is in a cantilever shape. The double-arm clamping device and the selective wave soldering equipment have the advantage that the stability is improved.

Description

Technical Field

[0001] This application relates to the technical field of selective wave soldering equipment, and more particularly, to a double-arm clamping device and a selective wave soldering equipment. Background Art

[0002] Soldering is a very commonly used processing method in modern industrial production. For soldering of circuit boards, a soldering method called wave soldering is usually adopted. Wave soldering is to directly contact the soldering surface of the circuit board with high-temperature liquid tin to achieve the soldering purpose. The high-temperature liquid tin maintains an inclined plane, and a special device makes the liquid tin form a phenomenon similar to waves, so it is called wave soldering. However, wave soldering is to contact the entire circuit board with the tin spraying surface and rely on the surface tension of the solder to naturally climb to complete the soldering. For circuit boards with large heat capacity and multi-layer circuit boards, it is very difficult for wave soldering to meet the requirements of tin penetration. Ordinary wave soldering is suitable for mass production of circuit boards with low quality requirements.

[0003] When it is necessary to solder small batches of circuit boards with high quality requirements, selective wave soldering is usually used. Selective wave soldering means that through equipment programming, the flux spraying module can sequentially complete selective spraying of flux on each solder joint. After preheating by the preheating module, the soldering module can then complete soldering of each solder joint point by point.

[0004] It should be noted that wave soldering and selective wave soldering belong to different process types. Therefore, there are also many substantial differences between the equipment for implementing these two processes.

[0005] In the existing selective wave soldering equipment of selective wave soldering, a pipeline-style design layout is usually adopted. Among them, there is a conveyor belt located above and a soldering device located below the conveyor belt. The conveyor belt drives the circuit board to be conveyed in a pipeline manner, and then the soldering device located below welds the circuit board located above. Usually, in this way, a large space is required to arrange the conveyor belt, and a driving component also needs to be set to drive the movement of the tin furnace in the space, so as to solder the circuit board that remains fixed and is conveyed along with the conveyor belt. Since the tin furnace is filled with molten tin liquid, when the tin furnace moves, the tin liquid inside will vibrate, thus affecting the soldering quality.

[0006] Specifically, in the Chinese invention patent application with the application number 201010574893.2, it discloses a PCB selective wave soldering device. In the Chinese utility model patent with the application number 202022139199.X, it discloses a full-automatic selective wave soldering device. In the Chinese invention patent application with the application number 201611006082.6, it discloses an on-line selective wave soldering machine. In the above-mentioned disclosed prior arts, they all use a conveyor belt mechanism to convey and hold the circuit board in a fixed state. The circuit board only moves along with the conveying direction of the conveyor belt, and then a driving component is used to drive the soldering device and the spraying device to move for soldering.

[0007] The above-mentioned method has problems of large space occupation and unstable soldering quality.

[0008] In response to this, in some other prior arts, such as the Chinese invention patent application with the application number 201611006043.6, it discloses a desktop selective wave soldering machine. Specifically, it discloses a fixed mounting base in a rectangular shape, which includes a mounting base bottom plate arranged horizontally and transversely. Four mounting base side plates arranged in a rectangular distribution and connected in sequence are screwed on the upper surface of the mounting base bottom plate. Each mounting base side plate is arranged vertically. An activity mounting frame is relatively movably installed on the upper end side of the fixed mounting base. An activity support plate is relatively movably installed on the activity mounting frame. A tin pump assembly is installed on the upper surface of the mounting base bottom plate at the lower end side of the activity support plate. A Y-axis driving linear module that moves horizontally forward and backward is installed on the mounting base side plate of the fixed mounting base. A Z-axis driving linear module that moves up and down is installed at the driving end of the Y-axis driving linear module. The driving end of the Z-axis driving linear module is connected to the activity mounting frame. An X-axis driving linear module that moves horizontally left and right is installed on the activity mounting frame. The driving end of the X-axis driving linear module is connected to the activity support plate. The PCB board to be soldered is placed on the activity support plate. Before the PCB board is soldered, its left and right positions can be adjusted by the X-axis driving linear module, its front and back positions can be adjusted by the Y-axis driving linear module, and its up and down positions can be adjusted by the Z-axis driving linear module.

[0009] That is, in the above prior art, it discloses a method of driving a PCB board to move in the X, Y, and Z axes, and fixing the tin pump assembly. By driving the PCB board to correspond to the tin pump assembly, welding can be completed. This method can effectively reduce space occupation. Moreover, since the tin pump assembly is fixedly arranged, there will be no problem of tin liquid oscillating due to the movement of the tin pump assembly, which can improve the welding quality and safety. However, in the solution adopted in the above prior art, it can only weld a single PCB board. After each welding is completed, the PCB board needs to be disassembled and assembled. Moreover, from its drawings and overall solution, its solution is specifically designed for small space occupation. There is even no mechanism for spraying flux in its solution. It is completely designed for the situation with extremely low production volume and very strict requirements for space occupation, and is more designed for individual users or teaching situations. This method brings the problem of extremely low production efficiency and is not suitable for use in a factory production environment. For today's factory production, how to balance space occupation and production efficiency has become an important issue.

[0010] In view of the problems existing in the above prior art, the applicant proposed a circuit board tin spraying process in the Chinese invention patent application with the application number 202311384362.0. Specifically, by setting two groups of flux spraying devices and tin spraying and soldering devices in cooperation with two groups of moving modules, the flux spraying and tin spraying and soldering operations can be carried out simultaneously, and the flux spraying and tin spraying and soldering operations do not interfere with each other. The circuit boards sprayed by two groups or multiple groups of the flux spraying devices are sequentially moved by the moving modules to the tin spraying and soldering devices for tin spraying, so that the tin spraying and soldering devices are in a continuous working state, realizing flux spraying and tin soldering at the same time, effectively improving the soldering efficiency of the circuit board and saving energy consumption at the same time.

[0011] In the above-mentioned prior application, the applicant first proposed to use two sets of moving modules to achieve alternating work, so that the solder spraying and soldering device is in a continuous working state. However, in this prior art, two sets of flux spraying devices need to be set up, the solder spraying and soldering device is set in the middle of the two sets of flux spraying devices, and then moving modules are respectively set at both ends of one side of the operating table to complete flux spraying and solder spraying. This method not only results in a relatively high manufacturing cost due to the need to set up two sets of flux spraying devices, but also requires a relatively large amount of space. The moving modules are set on the same side of the operating table, and the two sets of flux spraying devices are respectively located at both ends of the operating table, which leads to the need to set up loading and unloading stations at both ends of the operating table respectively, further increasing the space occupation. In addition, the moving modules are set on the same side of the operating table, which is also likely to cause uneven weight distribution of the whole machine equipment, resulting in problems such as inconvenient transportation. In the disclosed moving module, it includes two slide rails, one end of each of the two slide rails is fixedly connected with a support block, a transmission rod is rotatably connected between the two support blocks, a sliding block is fixedly connected to the bottom of the first clamping plate, the sliding block is slidably arranged on the slide rail, and a circuit board clamp is fixedly connected between the two sliding blocks.

[0012] However, in the solution of the applicant's prior application mentioned above, due to the too large overhang of the slide rail, a relatively large bending moment will be generated, thus affecting the stability during the moving process.

[0013] In view of the above problems, it is urgent to make improvements. Utility Model Content

[0014] The purpose of this application is to provide a double-arm clamping device and a selective wave soldering equipment, which have the advantage of improving stability.

[0015] In the first aspect, this application provides a double-arm clamping device, and the technical solution is as follows:

[0016] It includes two overhanging arms arranged in parallel and at intervals, a clamping part located between the two overhanging arms, and a power part for driving the clamping part to move along the overhanging direction on the overhanging arms. One end of the clamping part is close to the fixed end of the overhanging arm, and the opposite end is far from the fixed end of the overhanging arm;

[0017] One end of the clamping part close to the fixed ends of the two overhanging arms is slidably arranged on the two overhanging arms, and the end far from the fixed ends of the overhanging arms is arranged in a suspended state, so that the clamping part is in a cantilever shape.

[0018] By setting the clamping part in a cantilever shape, the overhang of the overhanging arm in the overhanging direction can be reduced, thereby reducing the bending moment generated under the action of gravity, and thus having the beneficial effect of improving stability.

[0019] Further, in the present application, a slide rail extending along the overhanging direction is provided on the side surface of the overhanging arm, a slider is slidably arranged in the slide rail, and the slider is fixedly connected to the clamping part.

[0020] Further, in the present application, the slide rail is arranged on the outer side of the overhanging arm facing outward.

[0021] Further, in the present application, the clamping part includes a mounting member and a clamping member. The mounting member extends along the overhanging direction for fixedly connecting with the slider. The clamping member is arranged at the bottom of the mounting member for fixing a workpiece. The two mounting members are respectively fixedly connected to the sliders on the two overhanging arms, so that the mounting member is located on the outer side of the overhanging arm, and the clamping member is located below the overhanging arm.

[0022] Further, in the present application, a placement cavity is formed in the central area of the clamping member (220). The placement cavity penetrates through the bottom surface and the top surface of the clamping member (220). The clamping member (220) is composed of a plurality of rods or plates spliced together or is of an integral structure.

[0023] Further, in the present application, the mounting member is provided with a first opening along the overhanging direction, and a connecting block is arranged at one end connected to the slider for connecting with the power part.

[0024] Further, in the present application, the power part includes a motor and a synchronous belt. The synchronous belt includes a first roller, a second roller and a conveyor belt. The first roller is connected to the motor. The second roller is rotatably arranged at one end of the overhanging arm. The conveyor belt is covered on the first roller and the second roller and is fixedly connected to the connecting block.

[0025] Further, in the present application, the first roller, the second roller and the conveyor belt are located on the outer side of the overhanging arm facing outward. A gap is provided between the conveyor belt and the overhanging arm. The mounting member is located in the gap area between the overhanging arm and the conveyor belt.

[0026] Further, in the present application, the power part is connected to one of the mounting members.

[0027] Further, in the present application, it further includes a mounting base. The fixed end of the overhanging arm is arranged on the mounting base. The mounting base is provided with a lifting opening on the side close to the clamping part. The lifting opening penetrates through the bottom surface and the top surface of the mounting base.

[0028] In a second aspect, the present application also proposes a selective wave soldering device, and the selective wave soldering device is provided with the above-mentioned double-arm clamping device.

[0029] As can be seen from the above, a double-arm clamping device and a selective wave soldering equipment provided by the present application can reduce the overhang amount of the cantilever in the overhanging direction by setting the clamping part in a cantilever shape, thereby reducing the bending moment generated under the action of gravity. Therefore, it has the beneficial effect of improving stability. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of a double-arm clamping device provided by the present application.

[0031] Figure 2 It is a disassembly schematic diagram of a double-arm clamping device provided by the present application.

[0032] Figure 3 It is a schematic structural diagram of a selective wave soldering equipment provided by the present application.

[0033] In the figure: 100, overhanging arm; 200, clamping part; 300, power part; 400, mounting base; 110, slide rail; 120, slider; 210, mounting piece; 220, clamping piece; 230, first opening; 240, connecting block; 310, motor; 320, first roller; 330, second roller; 340, conveyor belt; 410, lifting opening. Detailed Embodiments

[0034] Next, the technical solutions in the present application will be clearly and completely described in conjunction with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Usually, the components of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but only represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0036] In the Chinese invention patent application with the application number 202311384362.0, the mobile module involved includes two sliding rails arranged at intervals, and then the circuit board fixture is slidably arranged on the two sliding rails arranged at intervals. However, in this solution, both ends of the circuit board fixture in the extending direction are slidably connected to the sliding rails. In order to spray flux and perform welding on each welding point existing on the circuit board clamped by the circuit board fixture, it is necessary to drive the circuit board fixture to move to a position farther from the fixed end, and both ends of the circuit board fixture in the extending direction are slidably connected to the sliding rails, which results in the need to set the size of the sliding rails to be relatively long, that is, the sliding rails have a long overhang, which leads to a large bending moment under the action of gravity, easily causing instability during operation and affecting the service life.

[0037] For this, please refer to Figures 1 to 3 , and this application proposes a double-arm clamping device, and the technical solution is as follows:

[0038] It includes two overhanging arms 100 arranged in parallel and at intervals, a clamping part 200 located between the two overhanging arms 100, and a power part 300 for driving the clamping part 200 to move along the overhanging direction on the overhanging arms 100. One end of the clamping part 200 is close to the fixed end of the overhanging arms 100, and the opposite end is far from the fixed end of the overhanging arms 100;

[0039] One end of the clamping part 200 close to the fixed ends of the two overhanging arms 100 is slidably arranged on the two overhanging arms 100, and the end far from the fixed end of the overhanging arms 100 is arranged in a suspended state, making the clamping part 200 in a cantilever shape.

[0040] Among them, the overhanging arms 100 can be provided with two or multiple. The two overhanging arms 100 are arranged in parallel and at intervals, used to support and guide the movement of the clamping part 200, and can be made of aluminum profiles, having relatively high rigidity and strength. In some embodiments, the interval between the two overhanging arms 100 can be adjusted according to the size of the circuit board.

[0041] Among them, the clamping part 200 is located between the two overhanging arms 100, used to clamp the circuit board. The clamping part 200 can be designed in various forms, such as a fixture, a support plate, etc. One end of it is slidably connected to the overhanging arms 100, and the other end is arranged in a suspended state.

[0042] Among them, the power part 300 is used to drive the clamping part 200 to move along the overhanging direction of the overhanging arms 100, and specifically can include a driving motor 310 and a transmission mechanism.

[0043] By setting the clamping part 200 in a cantilever shape, the overhang amount of the overhanging arm 100 in the overhanging direction can be reduced, thereby reducing the bending moment generated under the action of gravity. Therefore, it has the beneficial effect of improving stability. Specifically, through the setting of the present application, the length of the overhanging arm 100 can be set to half of that of the above-mentioned prior art, significantly reducing the bending moment and thus improving the stability.

[0044] It should be noted that setting the clamping part 200 in a cantilever shape will make the suspended end thereof unstable. However, the instability caused by the cantilever shape of the clamping part 200 will not have too much impact on the actual work of spraying the solder resist and welding. Refer to Figure 3 , because when it is necessary to spray the soldering flux and weld the circuit board on the clamping part 200 at the welding point near the suspended end, although the clamping part 200 is in a cantilever shape at this time, the overall overhang amount of the clamping part 200 is not large, that is, the position where the clamping part 200 is connected to the overhanging arm 100 is not far from the fixed end of the overhanging arm 100. The resulting bending deformation and bending moment are limited and will not have too much impact on the work, and this impact is acceptable.

[0045] When it is necessary to spray the soldering flux and weld the circuit board on the clamping part 200 at the welding point near the fixed end, it is necessary to drive the clamping part 200 to move so that the corresponding welding point is aligned with the soldering flux spraying device and the welding device. During this process, as the clamping part 200 moves, the clamping part 200 will gradually move away from the fixed end of the overhanging arm 100, and the resulting bending deformation and bending moment will become larger. However, in this case, only the suspended end of the clamping part 200 will be significantly affected, and at this time, it is not the welding point near the suspended end of the circuit board that is processed, but the welding point near the fixed end of the circuit board. Although the suspended end of the clamping part 200 will generate a large bending deformation and bending moment at this time, the impact on the fixed end of the clamping part 200 is limited. After actual testing, this impact is acceptable.

[0046] Therefore, in the present application, the clamping part 200 is set in a cantilever shape. In this way, the extension length of the overhanging arm 100 can be reduced, not only saving costs, but also reducing the bending deformation and bending moment generated by the overhanging arm 100, and the overall stability is improved.

[0047] Furthermore, in some embodiments, a slide rail 110 extending along the overhanging direction is provided on the side surface of the overhanging arm 100, and a slider 120 is slidably arranged in the slide rail 110, and the slider 120 is fixedly connected to the clamping part 200.

[0048] Among them, the slide rail 110 can specifically be in a concave shape.

[0049] Among them, the slide rail 110 can be arranged on the inner side or the outer side of the cantilever 100 facing inward.

[0050] Arranging the slide rail 110 on the side surface of the cantilever 100 can make the center of gravity of the clamping part 200 lower, increasing stability.

[0051] Furthermore, in some embodiments, the slide rail 110 is arranged on the outer side of the cantilever 100 facing outward.

[0052] Arranging the slide rail 110 on the outer side of the cantilever 100 facing outward can increase stability compared to arranging it on the inner side of the cantilever 100 facing inward. Arranging it on the inner side will make the distance between the connection points shorter, easily causing the clamping part 200 to shake and be unstable during movement. Arranging it on the outer side can make the distance between the connection points larger, providing better stability.

[0053] Specifically, the clamping part 200 includes a mounting member 210 and a clamping member 220. The mounting member 210 extends along the cantilever direction for fixed connection with the slider 120. The clamping member 220 is arranged at the bottom of the mounting member 210 for fixing the workpiece. The two mounting members 210 are respectively fixedly connected to the sliders 120 on the two cantilevers 100, so that the mounting member 210 is located on the outer side of the cantilever 100, and the clamping member 220 is located below the cantilever 100.

[0054] Among them, a placement cavity is provided in the central area of the clamping member 220. The placement cavity penetrates the bottom surface and the top surface of the clamping member 220. The clamping member 220 is composed of multiple rods or plates spliced together or is an integral structure.

[0055] Providing a placement cavity in the central area of the clamping member 220 is for placing the workpiece. The placement cavity penetrating the bottom surface and the top surface of the clamping member 220 is for the workpiece to be placed into the placement cavity from the upper position of the clamping member 220, and then the bottom of the workpiece can contact the spraying device and the welding device located at the lower position.

[0056] Among them, the clamping member 220 can be composed of multiple rods or plates spliced together. The multiple rods or plates are spliced to form a frame structure with a placement cavity in the middle. The advantage of this setting method is that the parts processing is simple and it is convenient for disassembly and replacement.

[0057] Among them, the clamping member 220 can be an integral structure. Specifically, the clamping member 220 can be a complete plate with a placement cavity provided in the middle area. The advantage of this setting method is that the structural stability is higher, reducing the installation error caused by multiple parts and having higher precision.

[0058] Further, in some embodiments, the mounting member 210 is provided with a first opening 230 along the overhanging direction, and a connecting block 240 is provided at one end connected to the slider 120 and connected to the power unit 300.

[0059] By providing the first opening 230 along the overhanging direction in the mounting member 210, the weight of the mounting member 210 can be reduced, thereby reducing the bending deformation caused by the cantilever setting.

[0060] Specifically, the opening is provided at the end close to the overhanging part, and no opening is provided at the fixed end. The purpose of not providing an opening at the fixed end is to ensure the contact area between the mounting member 210 and the slider 120, thereby ensuring the stability of the connection.

[0061] Specifically, the power unit 300 includes a motor 310 and a synchronous belt. The synchronous belt includes a first roller 320, a second roller 330, and a conveyor belt 340. The first roller 320 is connected to the motor 310, the second roller 330 is rotatably provided at one end of the overhanging arm 100, the conveyor belt 340 is covered on the first roller 320 and the second roller 330, and is fixedly connected to the connecting block 240.

[0062] Further, in some embodiments, the first roller 320, the second roller 330, and the conveyor belt 340 are located on the outer side of the overhanging arm 100. There is a spaced arrangement between the conveyor belt 340 and the overhanging arm 100, and the mounting member 210 is located in the spaced area between the overhanging arm 100 and the conveyor belt 340.

[0063] Setting the first roller 320, the second roller 330, and the conveyor belt 340 on the outer side of the overhanging arm 100 and keeping a certain interval between the conveyor belt 340 and the overhanging arm 100, and at the same time placing the mounting member 210 in the spaced area between the overhanging arm 100 and the conveyor belt 340. The purpose of such a setting is to improve stability. Setting the first roller 320, the second roller 330, and the conveyor belt 340 on the outside of the overhanging arm 100 can increase the stability of the device. Since the first roller 320, the second roller 330, and the conveyor belt 340 are part of the power transmission structure, this layout helps to reduce the vibration and offset caused by power transmission, ensuring the smooth movement of the clamping part 200. In addition, this setting method is convenient for maintenance and repair. Setting on the outside of the overhanging arm 100 makes it easier to inspect, maintain, and replace the first roller 320, the second roller 330, the conveyor belt 340, and the mounting member 210.

[0064] Further, in some embodiments, the power unit 300 is connected to one of the mounting members 210.

[0065] The power unit 300 can be arranged to be connected to only one of the mounting members 210, which can reduce the complexity of the structure, facilitate assembly and maintenance, and also reduce costs.

[0066] Furthermore, in some embodiments, it further includes a mounting base 400. The fixed end of the cantilever 100 is arranged on the mounting base 400. The mounting base 400 is provided with a lifting opening 410 on the side close to the clamping portion 200, and the lifting opening 410 penetrates the bottom surface and the top surface of the mounting base 400.

[0067] The lifting opening 410 is for arranging a lifting structure. The overall body is driven by the lifting structure to perform lifting, so as to achieve movement in the height direction. That is, under the drive of the lifting structure, the circuit board clamped by the clamping portion 200 can be close to and away from the device for spraying flux and the device for welding. And arranging the lifting opening 410 on the side of the mounting base 400 close to the clamping portion 200 can optimize the center of gravity distribution, thereby improving stability.

[0068] In a second aspect, referring to Figure 3 , the present application also proposes a selective wave soldering equipment, and the selective wave soldering equipment is provided with the above-mentioned double-arm clamping device.

[0069] Arranging the above-mentioned double-arm clamping device on the selective wave soldering equipment can improve stability.

[0070] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A double-arm clamping device, used for being arranged on a selective wave soldering equipment, comprising two cantilever arms (100) arranged in parallel and at intervals, a clamping portion (200) located between the two cantilever arms (100), and a power portion (300) for driving the clamping portion (200) to move along the cantilever direction on the cantilever arm (100), one end of the clamping portion (200) is close to the fixed end of the cantilever arm (100), and the other end opposite to the cantilever arm (100) is far away from the fixed end of the cantilever arm (100), characterized in that: One end of the clamping portion (200) close to the fixed ends of the two cantilever arms (100) is slidably arranged on the two cantilever arms (100), and one end away from the fixed ends of the cantilever arms (100) is suspended, so that the clamping portion (200) is cantilevered.

2. A double-arm clamping device according to claim 1, characterized in that: A slide rail (110) extending along the overhanging direction is provided on the side of the overhanging arm (100), a slider (120) is slidably arranged inside the slide rail (110), and the slider (120) is fixedly connected to the clamping portion (200).

3. A double-arm clamping device according to claim 2, characterized in that: The slide rail (110) is arranged on the outward side of the cantilever arm (100).

4. A double-arm clamping device according to claim 3, characterized in that: The clamping portion (200) comprises a mounting member (210) and a clamping member (220); the mounting member (210) is extended along the overhanging direction and is used for being fixedly connected to the slider (120); the clamping member (220) is provided at the bottom of the mounting member (210) and is used for fixing a workpiece; the two mounting members (210) are respectively fixedly connected to the sliders (120) on the two cantilever arms (100), so that the mounting member (210) is located outside the cantilever arm (100) and the clamping member (220) is located below the cantilever arm (100).

5. A double-arm clamping device according to claim 4, characterized in that: A placement cavity is provided in the central area of ​​the clamping member (220), and the placement cavity passes through the bottom surface and the top surface of the clamping member (220). The clamping member (220) is composed of a plurality of rods or plates spliced ​​together or is an integrated structure.

6. A double-arm clamping device according to claim 4, characterized in that: The mounting member (210) is provided with a first opening (230) along the overhanging direction, and a connecting block (240) is provided at one end connected to the sliding block (120) and connected to the power unit (300).

7. A double-arm clamping device according to claim 6, characterized in that: The power unit (300) comprises a motor (310) and a synchronous belt, wherein the synchronous belt comprises a first roller (320), a second roller (330) and a conveyor belt (340), wherein the first roller (320) is connected to the motor (310), the second roller (330) is rotatably arranged at one end of the cantilever arm (100), and the conveyor belt (340) is covered on the first roller (320) and the second roller (330), and is fixedly connected to the connecting block (240).

8. A double-arm clamping device according to claim 7, characterized in that: The first roller (320), the second roller (330) and the conveyor belt (340) are located on the outward side of the cantilever arm (100), the conveyor belt (340) and the cantilever arm (100) are spaced apart, and the mounting member (210) is located in the spaced area between the cantilever arm (100) and the conveyor belt (340).

9. A double-arm clamping device according to claim 6, characterized in that: The power unit (300) is connected to one of the mounting members (210).

10. A selective wave soldering equipment, characterized in that: The selective wave soldering equipment is provided with a double-arm clamping device as described in any one of claims 1 to 9.

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