A quality inspection device for SMT patches

By designing a quality detection device for SMT patches, the auxiliary support components are used to achieve double-sided clamping, and the cleaning components and ringing components are set up, which solves the problems of cumbersome detection methods and poor support stability, and improves detection stability and work efficiency, avoid frictional damage and dust effects.

CN119198758BActive Publication Date: 2025-02-25CHANGZHOU HUAZHEN ELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202411710501.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-27
Publication Date
2025-02-25
Estimated Expiration
2044-11-27

AI Technical Summary

Technical Problem

The existing SMT patch quality inspection methods are cumbersome, and staff need to disassemble and assemble the patch repeatedly, resulting in low work efficiency and poor support stability of conventional supporting equipment, which poses a risk of falling.

Method used

A quality detection device for SMT patch is designed, and the auxiliary support assembly is used to combine the rotating motor and the cross hoisting block to achieve double-sided clamping to avoid frictional damage; at the same time, the dust cleaning assembly is set to clean up dust through the power source of the auxiliary support assembly, and The operating status sound prompt is issued through the ringing component.

Benefits of technology

Improve detection stability and work efficiency, avoid friction damage and dust effects of SMT patches, reduce workload on staff, and save energy.

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Abstract

The present application discloses a quality inspection device for SMT patches, which belongs to the field of quality inspection. The quality inspection device for SMT patches includes a conveyor belt device for transmitting SMT patches and a bracket base. A detector with multiple moving functions is installed on the middle side wall of the bracket base. An electric telescopic rod is installed inside the bracket base. A rotating motor is fixed on the moving rod of the electric telescopic rod. A cross lifting block is fixed on the top of the rotating shaft of the rotating motor. An auxiliary support component is installed inside the bracket base. The auxiliary support component is provided to cooperate with the cross lifting block at the top of the rotating shaft of the rotating motor to achieve the effect of double-sided clamping. At the same time, the auxiliary support component has the effect of cooperating with rotation. Therefore, friction damage will not be caused to the SMT patch during the rotation detection process, which improves the detection stability while not damaging the SMT patch.
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Description

Technical Field

[0001] The present application relates to the field of quality inspection, and in particular, to a quality inspection device for SMT patches. Background Art

[0002] SMT is surface mount technology, which is the most popular technology and process in the current electronic assembly industry. SMT patch refers to the abbreviation of a series of process flows based on printed circuit boards. At present, SMT patches need to be quality inspected during SMT patch processing. There are various ways to inspect SMT patches, among which infrared inspection is a common quality inspection method for SMT patches. Nowadays, the inspection method for SMT patches requires staff to fix SMT patches on the inspection table one by one, and after infrared inspection, remove the SMT patches and put them in a storage basket, and then fix another SMT patch on the inspection table. This inspection method is cumbersome and increases the workload of staff. Each time, staff need to repeatedly disassemble and install SMT patches on the inspection table, which affects work efficiency.

[0003] During the production process of SMT patches, the degree of fit of the detector and whether there is any damage are very important processes. Generally, the SMT patches need to be lifted from the conveyor belt and inspected by the detector. However, conventional lifting equipment only supports them through the bottom support, which will lead to poor support stability and the risk of falling during the inspection process. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a quality inspection device for SMT patches, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present application provides a quality inspection device for SMT patches, including a conveyor belt device for transmitting SMT patches, a bracket base, a detector with multiple moving functions is installed on the middle side wall of the bracket base, an electric telescopic rod is installed inside the bracket base, a rotating motor is fixed on the moving rod of the electric telescopic rod, and a cross lifting block is fixed on the top of the rotating shaft of the rotating motor;

[0006] The interior of the support base is equipped with an auxiliary support assembly, and the auxiliary support assembly includes:

[0007] A ball head rod connection block fixed in the middle of the rotating shaft of the rotating motor, a hydraulic chamber embedded in the top of the bracket base, a gear 1 fixed at the bottom of the ball head rod connection block, a hydraulic rod 1 slidably connected to the piston at one end of the hydraulic chamber, a hydraulic rod 2 slidably connected to the piston at the other end of the hydraulic chamber, a ball head rod fixed to the side of the hydraulic rod 1, an elastic telescopic rod fixed to the bottom of the hydraulic rod 2, a rubber pressure head installed at the bottom of the elastic telescopic rod through a ball bearing. The auxiliary support assembly is provided to cooperate with the cross lifting block at the top of the rotating shaft of the rotating motor to achieve the effect of double-sided clamping, and the auxiliary support assembly has the effect of cooperating with rotation, so that no friction damage will be caused to the SMT patch during the rotation detection process, while improving the detection stability, the SMT patch will not be damaged.

[0008] Preferably, the ball bearing is made by rotatably connecting an upper bearing piece and a lower bearing piece, and a sufficient amount of balls are filled between the upper bearing piece and the lower bearing piece.

[0009] Preferably, the ball head rod is rollingly connected in an annular groove of the ball head rod connecting block.

[0010] Preferably, a dust cleaning assembly is installed on the side of the bracket base, and the dust cleaning assembly includes a track rod fixed to the side of the bracket base, a rotating rod 1 and a rotating rod 2 connected to the side of the bracket base through the bracket rotation, and a support rod 1 fixed to the side of the bracket base; a hair dryer is laterally slidably connected to the track rod, a friction wheel 1 is fixed to one side of the rotating rod 1, and a bevel gear 1 is fixed to the other side of the rotating rod 1, a cylindrical rod is fixed to the front end of the friction wheel 1, a connecting rod passes through and is rotatably connected to the outer side of the cylindrical rod, and the end of the connecting rod away from the cylindrical rod is hingedly connected to the back of the hair dryer, a bevel gear 2 is fixed to the top of the rotating rod 2 that is vertically meshed with the bevel gear 1, a gear 2 is rotatably connected to the top of the support rod 1, a transmission rod is fixed to the top of the gear 2, and the transmission rod is transmission-connected to the rotating rod 2 through a belt. A dust cleaning component is provided to clean the dust accumulated during the transportation of SMT patches, so as to avoid the obstruction of dust and the influence of the detection results. The power source of the dust cleaning component comes from the auxiliary support component, so there is no need for an external power source. While achieving the dust cleaning effect, it also has the additional effect of energy saving and environmental protection.

[0011] Preferably, the hair dryer is provided with three groups of rotatable air supply nozzles and the directions thereof are aligned with the SMT patch.

[0012] Preferably, after the rotating motor drives gear one to rise, gear one is in meshing state with gear two.

[0013] Preferably, a bell assembly is installed at the upper end of the side of the bracket base, and the bell assembly includes a rotating rod 3 rotatably connected to the side of the bracket base, a supporting rod 2 fixed to the side of the bracket base, a friction wheel 2 fixed to the side of the rotating rod 3, a metal sphere fixed to the surface of the friction wheel 2, and a metal bell elastically connected to the side of the supporting rod 2 via a spring. By setting up the bell assembly to issue a sound reminder of the working status, there is no need for staff intervention during the detection process. At the same time, the reminder sound of the working status can remind the staff of the working status of the equipment.

[0014] Preferably, the second friction wheel is pressed and fitted with the first friction wheel, and the metal bell is located on the movement track of the metal sphere.

[0015] The benefits of this application are:

[0016] (1) The present application realizes the double-sided clamping effect by setting an auxiliary support component to cooperate with the cross lifting block at the top of the rotating shaft of the rotating motor. At the same time, the auxiliary support component has the effect of cooperating with the rotation. Therefore, during the rotation detection process, no friction damage will be caused to the SMT patch, thereby improving the detection stability while not damaging the SMT patch.

[0017] (2) This application provides a dust cleaning component to clean the dust accumulated during the transportation of SMT patches, so as to avoid the obstruction of dust and the impact on the detection results. The power source of the dust cleaning component comes from the auxiliary support component, so there is no need for an external power source. While achieving the dust cleaning effect, it also has the additional effect of energy saving and environmental protection.

[0018] (3) This application sets a ringing component to issue a sound reminder of the working status. No staff intervention is required during the detection process. At the same time, the working status reminder sound can remind the staff of the working status of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the overall front view of the present invention;

[0021] Figure 2 It is a schematic diagram of the sectional three-dimensional structure of the present invention as a whole from a front view perspective;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the overall back view of the present invention;

[0023] Figure 4It is a partial structural cross-sectional schematic diagram of the overall structure of the present invention;

[0024] Figure 5 The present invention Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 is a schematic structural diagram of the auxiliary support assembly of the present invention;

[0026] Figure 7 It is a partial structural schematic diagram of the auxiliary support assembly of the present invention;

[0027] Figure 8 The structure of the dust removal component of the present invention is shown in FIG. Figure 1 ;

[0028] Fig. 9 The structure of the dust removal component of the present invention is shown in FIG. Figure 2 ;

[0029] Fig.10 The structure of the bell assembly of the present invention is shown in FIG. Figure 1 ;

[0030] Fig.11 The structure of the bell assembly of the present invention is shown in FIG. Figure 2 .

[0031] In the above figure,

[0032] 100, conveyor belt equipment; 200, bracket base; 300, detector; 400, electric telescopic rod; 500, rotating motor; 600, cross lifting block;

[0033] 700, auxiliary support assembly; 710, hydraulic compartment; 720, hydraulic rod 2; 730, elastic telescopic rod; 740, hydraulic rod 1; 750, ball head rod; 760, ball head rod connecting block; 770, gear 1; 780, ball bearing; 790, rubber pressure head;

[0034] 800, dust cleaning assembly; 810, track rod; 820, friction wheel 1; 830, blower; 840, support rod 1; 850, gear 2; 860, belt; 870, rotating rod 1; 880, bevel gear 1; 890, rotating rod 2; 8100, bevel gear 2; 8110, cylindrical rod; 8120, linkage rod;

[0035] 900, bell assembly; 910, rotating rod three; 920, friction wheel two; 930, supporting rod two; 940, metal bell; 950, spring; 960, metal sphere. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application are described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0039] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0040] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] Example 1: See Figure 1-Figure 7 , This embodiment provides a quality inspection device for SMT patches, including a conveyor belt device 100 for transmitting SMT patches and a bracket base 200. The conveyor belt device 100 is a prior art and can realize a pause-type transmission operation. It can pause for a period of time during the transportation process to detect the SMT patches on its surface. A detector 300 with multiple moving functions is installed on the middle side wall of the bracket base 200. An electric telescopic rod 400 is installed inside the bracket base 200. A rotating motor 500 is fixed on the moving rod of the electric telescopic rod 400. A cross lifting block 600 is fixed on the top of the rotating shaft of the rotating motor 500. A layer of rubber pad is attached to the upper surface of the cross lifting block 600 to increase friction and protect the SMT patches.

[0043] The interior of the support base 200 is equipped with an auxiliary support assembly 700, and the auxiliary support assembly 700 includes:

[0044] A ball head rod connecting block 760 fixed to the middle of the rotating shaft of the rotating motor 500, a hydraulic chamber 710 embedded in the top of the bracket base 200, a gear 1 770 fixed to the bottom of the ball head rod connecting block 760, a hydraulic rod 1 740 is slidably connected to the piston at one end of the hydraulic chamber 710, a hydraulic rod 2 720 is slidably connected to the piston at the other end of the hydraulic chamber 710, a ball head rod 750 is fixed to the side of the hydraulic rod 1 740, the ball head rod 750 is rollingly connected to the annular groove of the ball head rod connecting block 760, and an elastic telescopic rod 73 is fixed to the bottom of the hydraulic rod 2 720. 0, a rubber pressure head 790 is installed at the bottom of the elastic telescopic rod 730 through a ball bearing 780, and the ball bearing 780 is made of an upper bearing plate and a lower bearing plate rotatably connected, and a sufficient amount of balls are filled between the upper bearing plate and the lower bearing plate. The auxiliary support component 700 is arranged to cooperate with the cross lifting block 600 at the top of the rotating shaft of the rotating motor 500 to achieve a double-sided clamping effect. At the same time, the auxiliary support component 700 has a cooperative rotation effect, so that no friction damage will be caused to the SMT patch during the rotation detection process, thereby improving the detection stability while not damaging the SMT patch.

[0045] When the above-mentioned equipment is used in practice, when the conveyor belt device 100 transports the SMT patch to be inspected to the inspection area of ​​the detector 300, the conveyor belt device 100 stops temporarily, and the electric telescopic rod 400 is used to push the rotating motor 500 to move upward. At this time, the cross lifting block 600 will move upward to lift the SMT patch. At the same time, as the rotating motor 500 rises, the ball head rod connecting block 760 fixed on its rotating shaft will drive the ball head rod 750 to move upward, and the rise of the ball head rod 750 will drive the hydraulic rod 1 740 to move upward. At this time, the liquid pressure in the hydraulic bin 710 changes, which will push the hydraulic rod 2 720 to move downward, and then push the elastic telescopic rod 730 to move downward, and drive the rubber pressure head 790 to move downward under the action of the ball bearing 780, and through the rubber The pressure head 790 squeezes the upper surface of the SMT patch and cooperates with the cross-lifting block 600 at the top of the rotating shaft of the rotating motor 500 to achieve a double-sided clamping effect. Since the ball bearing 780 is made of an upper bearing plate and a lower bearing plate that are rotatably connected, and a sufficient amount of balls are filled between the upper bearing plate and the lower bearing plate, the rubber pressure head 790 has a rotatable characteristic. Subsequently, a mobile detection is performed through a detector 300 with multiple moving functions. During the detection process, the cross-lifting block 600 is controlled to rotate by the rotating motor 500, so that the SMT patch rotates to perform a full range of detection. Since the auxiliary support assembly 700 has the effect of cooperating with the rotation, no friction damage will be caused to the SMT patch during the rotation detection process, thereby improving the detection stability while not damaging the SMT patch.

[0046] Example 2: See Figure 1-Figure 9On the basis of the first embodiment, the present application is equipped with a dust cleaning assembly 800 on the side of the bracket base 200, and the dust cleaning assembly 800 includes a track rod 810 fixed on the side of the bracket base 200, a rotating rod 1 870 and a rotating rod 2 890 connected to the side of the bracket base 200 through the bracket, and a support rod 1 840 fixed to the side of the bracket base 200. A hair dryer 830 is connected to the track rod 810 for transverse sliding. The hair dryer 830 is provided with three groups of rotatable air supply nozzles and their directions are aligned with the SMT patch. A friction wheel 1 820 is fixed on one side of the rotating rod 1 870, and a bevel gear 1 880 is fixed on the other side of the rotating rod 1 870. A cylindrical rod 8110 is fixed to the front end of the friction wheel 1 820. A connecting rod 8120 is passed through and rotatably connected to the outer side of the cylindrical rod 8110. The connecting rod One end of 8120 away from the cylindrical rod 8110 is hingedly connected to the back of the hair dryer 830, and the top of the rotating rod 890 is fixed with a bevel gear 8100 vertically meshing with the bevel gear 880, and the top of the support rod 840 is rotatably connected with the gear 850, and the top of the gear 850 is fixed with a transmission rod, and the transmission rod is connected to the rotating rod 890 through a belt 860. After the rotating motor 500 drives the gear 770 to rise, the gear 770 and the gear 850 are in a meshing state. The present application sets a dust cleaning component 800 to clean the dust accumulated on the SMT patches during transportation to avoid the impact of dust on the detection results. The power source of the dust cleaning component 800 comes from the auxiliary support component 700, so there is no need for an external power source. While achieving the cleaning effect, it also has the additional effect of energy saving and environmental protection.

[0047] When the above device is used, the hair dryer 830 is in a blowing state during the detection process. As the rotating motor 500 in Example 1 rises, the gear 1 770 fixed on its rotating shaft will be in a meshing state with the gear 2 850. At this time, when the rotating motor 500 rotates, the gear 2 850 will be driven to rotate through the gear 1 770. The transmission rod at the top of the gear 2 850 drives the rotating rod 2 890 to rotate through the belt 860. The rotating rod 2 890 is driven by the bevel gear 2 810 at its top. 0 drives bevel gear 880 to rotate, and the rotation of bevel gear 880 then drives rotating rod 870 to rotate, and further drives friction wheel 820 to rotate. As friction wheel 820 rotates, cylindrical rod 8110 fixed thereon drives linkage rod 8120 to rotate, and the end of linkage rod 8120 is connected to blower 830, so it drives blower 830 to move back and forth on track rod 810 to clean dust accumulated during transportation of SMT patches, so as to avoid affecting the detection results due to dust obstruction.

[0048] Example 3: See Figure 1-Figure 11On the basis of the second embodiment, the present application is equipped with a bell assembly 900 at the upper end of the side of the bracket base 200, and the bell assembly 900 includes a side rotating rod three 910 rotatably connected to the bracket base 200, and a support rod two 930 fixed to the side of the bracket base 200, and a friction wheel two 920 is fixed to the side of the rotating rod three 910, and a metal sphere 960 is fixed to the surface of the friction wheel two 920, and a metal bell 940 is elastically connected to the side of the support rod two 930 through a spring 950, and the friction wheel two 920 is squeezed and fitted with the friction wheel one 820, and the metal bell 940 is located on the movement trajectory of the metal sphere 960. The present application issues a sound prompt of the working status by setting the bell assembly 900, and no staff intervention is required during the detection process. At the same time, the prompt sound of the working status can remind the staff of the working status of the equipment.

[0049] When the above-mentioned device is used in practice, on the basis of Example 2, as the friction wheel 1 820 rotates, the friction wheel 2 920 is driven to rotate under the action of friction force. During the rotation of the friction wheel 2 920, the metal sphere 960 fixed thereon will continuously knock the metal bell 940, thereby issuing a sound prompt of the working status. During the detection process, no staff intervention is required. At the same time, the prompt sound of the working status can remind the staff of the working status of the equipment.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A quality inspection device for SMT patches, comprising a conveyor belt device (100) for transmitting SMT patches, and a support base (200), wherein a detector (300) having multiple moving functions is mounted on a middle side wall of the support base (200), an electric telescopic rod (400) is mounted inside the support base (200), a rotating motor (500) is fixed on the moving rod of the electric telescopic rod (400), and a cross lifting block (600) is fixed on the top end of the rotating shaft of the rotating motor (500); It is characterized in that An auxiliary support assembly (700) is assembled inside the support base (200), and the auxiliary support assembly (700) comprises: A ball head rod connection block (760) fixed to the middle of the rotating shaft of the rotating motor (500), and a hydraulic chamber (710) embedded in the top of the bracket base (200), wherein a gear 1 (770) is fixed to the bottom of the ball head rod connection block (760), a hydraulic rod 1 (740) is slidably connected to a piston at one end of the hydraulic chamber (710), a hydraulic rod 2 (720) is slidably connected to a piston at the other end of the hydraulic chamber (710), a ball head rod (750) is fixed to the side of the hydraulic rod 1 (740), an elastic telescopic rod (730) is fixed to the bottom of the hydraulic rod 2 (720), and a rubber pressure head (790) is installed at the bottom of the elastic telescopic rod (730) via a ball bearing (780); The ball bearing (780) is made by rotatably connecting an upper bearing piece and a lower bearing piece, and a sufficient number of balls are filled between the upper bearing piece and the lower bearing piece; The ball head rod (750) is rollingly connected in the annular groove of the ball head rod connecting block (760).

2. A quality inspection device for SMT patches according to claim 1, characterized in that: A dust cleaning assembly (800) is mounted on the side of the support base (200), and the dust cleaning assembly (800) comprises a track rod (810) fixed to the side of the support base (200), a rotating rod 1 (870) and a rotating rod 2 (890) connected to the side of the support base (200) by the support, and a support rod 1 (840) fixed to the side of the support base (200). A blower (830) is slidably connected to the track rod (810), a friction wheel 1 (820) is fixed to one side of the rotating rod 1 (870), and a bevel gear 1 (880) is fixed to the other side of the rotating rod 1 (870). A cylindrical rod (8110) is fixed to the front end of wheel one (820), a connecting rod (8120) passes through the outer side of the cylindrical rod (8110) and is rotatably connected thereto, an end of the connecting rod (8120) away from the cylindrical rod (8110) being hingedly connected to the back of the hair dryer (830), a bevel gear (8100) vertically meshing with bevel gear one (880) is fixed to the top end of the rotating rod two (890), a gear two (850) is rotatably connected to the top end of the supporting rod one (840), a transmission rod is fixed to the top end of the gear two (850), and the transmission rod is transmission-connected to the rotating rod two (890) via a belt (860).

3. A quality inspection device for SMT patches according to claim 2, characterized in that: The hair dryer (830) is provided with three groups of rotatable air supply nozzles and the directions thereof are aligned with the SMT patch.

4. A quality inspection device for SMT patches according to claim 2, characterized in that: After the rotating motor (500) drives the gear 1 (770) to rise, the gear 1 (770) and the gear 2 (850) are in a meshing state.

5. The SMT patch quality inspection device according to claim 2, characterized in that: A bell assembly (900) is mounted on the upper end of the side surface of the support base (200), and the bell assembly (900) comprises a rotating rod three (910) rotatably connected to the side surface of the support base (200), and a supporting rod two (930) fixed to the side surface of the support base (200); a friction wheel two (920) is fixed to the side surface of the rotating rod three (910), a metal sphere (960) is fixed to the surface of the friction wheel two (920), and a metal bell (940) is elastically connected to the side surface of the supporting rod two (930) via a spring (950).

6. The SMT patch quality inspection device according to claim 5, characterized in that: The second friction wheel (920) is pressed and fitted with the first friction wheel (820), and the metal bell (940) is located on the movement track of the metal sphere (960).

Citation Information

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