Detection conveying system

Abstract

The utility model relates to a detection conveying system, which comprises a detection device, a positioning device and a loading and unloading device, the detection device comprises a detection table and a measuring machine arranged on the detection table, and the positioning device is arranged on a detection position and is used for supporting a piece to be detected; the loading and unloading device comprises an operation table and a transfer assembly, and the transfer assembly is used for conveying the to-be-detected piece to the positioning device or receiving the detected piece conveyed back from the positioning device; wherein a plurality of conveying rollers are arranged on the transfer station and the positioning device, and rotating shafts of the conveying rollers are parallel; the loading and unloading device conveys the to-be-detected piece to the positioning device, so that the conveying stability is improved, and the collision damage caused in the process of directly hoisting by a joist barrow is reduced; the conveying of the compressor shell is driven through the rolling of the conveying roller, the conveying efficiency is high, the compressor shell and other to-be-detected pieces with large mass can be conveyed to a detection position, and the to-be-detected pieces can be conveniently measured by a measuring machine.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection equipment, and specifically relates to a detection conveying system. Background Art

[0002] The compressor housing is an important component of the compressor. It can effectively protect the compressor movement and prevent dust, moisture and other impurities from the external environment from entering, thereby ensuring the normal operation of the compressor.

[0003] The dimensional accuracy of the compressor casing directly affects the performance and operating efficiency of the compressor. If the casing size is unqualified, it may lead to poor fit of the internal parts of the compressor, increase friction and wear, and reduce the operating efficiency and service life of the equipment; if the casing has defects such as cracks and deformation, leakage, explosion and other safety accidents may occur during use.

[0004] At present, the commonly used inspection methods for heavy parts to be inspected, such as compressor housings, mainly rely on traditional measuring tools and techniques, such as calipers and micrometers. The above inspection methods are inefficient and labor-intensive. Manual inspection methods have large errors and uncertainties, and the inspection results are greatly affected by factors such as the operator's technical level, experience, and fatigue.

[0005] There are also measuring machines for automated inspection, which require a gantry crane to lift the compressor housing and wait for the inspection part to be brought to the inspection position of the measuring machine. Due to the large size and weight of the housing, when the workpiece is lifted by a manual gantry crane, it may bump into the measuring machine and cause damage. In addition, it is difficult to position the inspection part when the gantry crane is placed, and there are also problems such as inaccurate positioning and poor accuracy of inspection results. Summary of the invention

[0006] The purpose of the utility model is to provide a detection and conveying system to solve the problems existing in the prior art of large manual detection errors, high labor intensity, poor positioning accuracy, and low detection accuracy when conducting quality inspection on heavy parts to be inspected such as compressor housings.

[0007] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0008] The utility model proposes a detection and conveying system, which comprises:

[0009] A testing device, comprising a testing platform and a measuring machine arranged on the testing platform, wherein a testing position is arranged below the measuring machine;

[0010] A positioning device, which is arranged at the detection position and is used to support the part to be detected;

[0011] A loading and unloading device, comprising an operating table and a transfer assembly movably connected to the operating table, wherein the transfer assembly comprises at least one transfer station, and the corresponding transfer station is used to transport the to-be-tested parts to the positioning device or to receive the completed parts transported back from the positioning device;

[0012] Wherein, the transfer station and the positioning device are both provided with a plurality of conveying rollers, and the rotation axes of the conveying rollers are parallel.

[0013] In some embodiments of the present application, a transition device is further included, which is arranged between the positioning device and the loading and unloading device, and is used to transport the parts to be inspected from the transfer station to the positioning device, or to transport the inspected parts from the positioning device to the transfer station.

[0014] In some embodiments of the present application, the transfer assembly includes a transfer base plate, on which a plurality of transfer stations are arranged along a conveying direction perpendicular to the part to be inspected; a first support member is respectively arranged on both sides of each of the transfer stations, the bottom of the first support member is fixed on the transfer base plate, and a plurality of first conveying rollers are rotatably connected between two of the first support members.

[0015] In some embodiments of the present application, a guide rail portion is provided on the operating table, and a guide portion adapted to the guide rail portion is provided below the transfer component, and the transfer component moves relative to the operating table under the action of a driving member.

[0016] In some embodiments of the present application, limiting mechanisms are provided at both ends of the operating table along the moving direction of the transfer assembly to limit the maximum displacement of the transfer assembly.

[0017] In some embodiments of the present application, along the conveying direction of the parts to be inspected, stop members are respectively provided at both ends of each transfer station, and the stop members are configured to be able to be raised and lowered relative to the transfer station.

[0018] In some embodiments of the present application, the transition device includes a transition base plate, two second support members spaced apart on the transition base plate, and a plurality of second conveying rollers rotatably connected between the two second support members.

[0019] In some embodiments of the present application, the positioning device includes a supporting base plate, a lifting support assembly, and a plurality of third conveying rollers rotatably connected to the lifting support assembly;

[0020] The lifting support assembly includes a lifting base plate, two third support members fixed on the lifting base plate, and a lifting drive unit, wherein the lifting drive unit is fixed on the support base plate, and the lifting support assembly is lifted and lowered under the drive of the lifting drive unit.

[0021] In some embodiments of the present application, the part to be inspected is supported on the conveying roller by a pallet part, and at least one positioning part is also provided on the support base plate, and the positioning part is located between the two third supporting parts. The bottom of the pallet part is provided with a matching part adapted to each of the positioning parts.

[0022] In some embodiments of the present application, a position sensor is also provided on the support bottom plate for detecting the transport position of the part to be inspected. During the conveying process, the height of each of the third conveying rollers is flush with each of the second conveying rollers and each of the first conveying rollers. During the detection process, the height of the third conveying rollers drops to the target height, and the positioning member is connected to the matching portion.

[0023] In some embodiments of the present application, a control system is further included, which is connected to the driving member, the lifting driving part, the stopping member, the position sensor and each of the conveying rollers by signal.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are:

[0025] The inspection and conveying system involved in the present application caches and conveys the inspected parts through the loading and unloading device, and the loading and unloading device conveys the inspected parts to the positioning device, thereby improving the stability of the conveying and reducing the collision damage caused by the direct hoisting process of the gantry truck;

[0026] The loading and unloading device and the positioning device both include a plurality of conveying rollers, which drive the conveying of the compressor housing through the rolling of the conveying rollers. The conveying efficiency is high, and the compressor housing and other heavy-duty parts to be inspected can be conveyed to the inspection position, which is convenient for the measuring machine to measure them.

[0027] In addition, the loading and unloading device can be set up with multiple transfer stations. When transporting the parts to be inspected to the inspection position, they can continue to be loaded to different transfer stations through the feeding device to improve the inspection efficiency. After the inspection is completed, the workpiece can be returned to the corresponding transfer station. Loading and unloading can be carried out simultaneously to improve work efficiency.

[0028] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a structural schematic diagram of an embodiment of the detection and conveying system proposed by the utility model;

[0031] Figure 2 It is a schematic diagram of the structure of part of the detection and conveying system;

[0032] Figure 3 It is a schematic diagram of the structure of the loading and unloading device;

[0033] Figure 4 It is a schematic diagram of the structure of the transport component;

[0034] Figure 5 It is a schematic diagram of the connection between the part to be tested and the pallet part;

[0035] Figure 6 It is a schematic diagram of the external structure of the transition component;

[0036] Figure 7 is a schematic diagram of the transition component structure;

[0037] Figure 8 It is one of the schematic diagrams of the positioning device structure;

[0038] Fig. 9 This is the second schematic diagram of the positioning device structure;

[0039] Fig.10 Schematic diagram of the matching part structure;

[0040] In the figure,

[0041] 100. Feeding device;

[0042] 200. Loading and unloading device;

[0043] 201, first transfer station; 202, second transfer station; 203, third transfer station;

[0044] 210. Operation table;

[0045] 220, transfer assembly; 2201, first support member; 2202, first conveying roller; 2203, limiting mechanism; 2204, transfer bottom plate;

[0046] 230, guide rail portion; 240, driving member;

[0047] 300, testing device; 310, testing table; 320, measuring machine;

[0048] 400, positioning device; 410, third support member; 420, third conveying roller; 430, positioning member; 440, supporting bottom plate; 450, lifting drive unit; 460, lifting bottom plate;

[0049] 500, transition device; 510, second support member; 520, second conveying roller; 530, transition bottom plate;

[0050] 600, part to be tested; 610, tray part; 611, matching part; 612, spherical groove;

[0051] 700. Control system;

[0052] 800, controller; 810, position sensor;

[0053] 900. Guard plate. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0060] refer to Figure 1 , Figure 2 The utility model proposes a detection and conveying system, which includes a detection device 300, a positioning device 400 and a loading and unloading device 200. The loading and unloading device 200 is used to cache and convey cached parts 600 to be detected and unload and sort the completed parts for detection. The detection device 300 is used to detect the parts 600 to be detected. The positioning device 400 is used to limit the parts 600 to be detected during the detection process.

[0061] The detection device 300 includes a detection platform 310 and a measuring machine 320 disposed on the detection platform 310 , and a detection position is disposed below the measuring machine 320 .

[0062] The measuring machine 320 is an automated measuring device, on which a measuring head is formed. After the inspected piece 600 is placed on the inspection position, the measuring head measures the dimensions along the surface of the inspected piece 600 to achieve automated inspection.

[0063] The positioning device 400 is disposed at the detection position, and is used to transport the part to be detected 600 and to limit the position of the part to be detected 600 during the detection process.

[0064] The loading and unloading device 200 includes an operating table 210 and a transfer component 220 movably connected to the operating table 210. The transfer component 220 includes at least one transfer station, and the corresponding transfer station is used to transport the parts to be inspected 600 to the positioning device 400 or to receive the completed inspection parts returned from the positioning device 400.

[0065] Wherein, a plurality of conveying rollers are arranged on the transfer station and the positioning device 400, and the rotation axes of the conveying rollers are parallel.

[0066] Each conveyor roller is an electric roller, or the start and stop of each conveyor roller is controlled by other drive forms, refer to Figure 5 The piece to be detected 600 is pre-fixed on the tray piece 610, and the tray piece 610 is placed on the conveying roller, and the conveying of the piece to be detected 600 is achieved by the rotation of the conveying roller.

[0067] In some embodiments of the present application, a transition device 500 is further provided between the positioning device 400 and the loading and unloading device 200, and the transition device 500 is used to transport the part to be inspected 600 from the transfer station to the positioning device 400, or to transport the inspected part from the positioning device 400 to the transfer station.

[0068] refer to Figure 3 The loading and unloading device 200 is provided with a plurality of transfer stations along the first direction. For example but not limited to, along the first direction, the transfer assembly 220 includes a first transfer station 201, a second transfer station 202 and a third transfer station 203, and each transfer station is used to receive and transport the parts to be inspected 600 or the parts after inspection.

[0069] Each transfer station is provided with a status indicator light for real-time display of the current status of the material at this station. For example, if there are 600 pieces to be inspected cached at the transfer station, the status indicator light is green; if there are no 600 pieces to be inspected at the transfer station, the status indicator light is yellow; if there is a system abnormality at the transfer station, the status indicator light is red for easy manual inspection.

[0070] For ease of understanding, the conveying direction of the inspected piece 600 on the loading and unloading device 200 , the transition device 500 and the positioning device 400 is defined as the second direction, and the first direction is perpendicular to the second direction.

[0071] The conveying direction of the conveying rollers on each transfer station is also along the second direction.

[0072] A guide rail portion 230 is disposed on the operating table 210 , and the guide rail portion 230 extends along a first direction. A guide portion adapted to the guide rail portion 230 is disposed below the transfer component 220 . The transfer component 220 moves relative to the operating table 210 under the action of the driving member 240 .

[0073] The driving member 240 can be configured as a hydraulic cylinder, an electric push rod, or a gear drive structure. The driving motor is fixed inside the operating table 210. The output end of the driving motor is connected to the gear through a reduction structure. A chain is rotatably connected to the operating table 210. The chain is connected to the connecting gear. The top of the chain is fixed to the transfer component 220. After the driving motor is turned on, it drives the connecting gear to rotate, and then drives the rack to rotate, thereby driving the transfer component 220 to move, thereby achieving the purpose of transportation.

[0074] The part to be inspected 600 is conveyed to the transfer component 220 through the feeding device 100. After the feeding device 100 conveys the part to be inspected 600 to the first transfer station 201, the driving member 240 drives the transfer component 220 to move to the left, so that the second transfer station 202 corresponds to the feeding device 100. In this state, the first transfer station 201 moves to a position corresponding to the position of the transition device 500, and the part to be inspected 600 on the first transfer station 201 is conveyed to the positioning device 400 through the transition device 500.

[0075] Then, the loading process of the second transfer station 202 and the conveying process of the first transfer station 201 can be performed synchronously, and the to-be-detected parts 600 on the second transfer station 202 are in a detection cache state, which is beneficial to improving the detection efficiency.

[0076] After the inspection of the parts 600 to be inspected on the first transfer station 201 is completed, they are transported back to the first transfer station 201 through the transition device 500, and the driving member 240 drives the transfer assembly 220 to continue to move to the left, and the inspected parts on the first transfer station 201 are unloaded and sorted. At the same time, the parts 600 to be inspected on the second transfer station 202 are transported to the positioning device 400 for inspection, and the feeding device 100 continues to load materials to the third transfer station 203 for caching.

[0077] The transfer component 220 is provided with a plurality of transfer stations, which is conducive to the simultaneous operation of multiple work processes including feeding, testing and unloading, and is conducive to improving the testing efficiency.

[0078] In some embodiments of the present application, a limiting mechanism 2203 is further provided at both ends of the operating platform 210 along the moving direction (ie, the first direction) of the transfer component 220 to limit the maximum displacement of the transfer component 220 .

[0079] In some embodiments of the present application, along the conveying direction of the to-be-detected part 600, stop members are respectively provided at both ends of each transfer station, and the stop members are configured to be raised and lowered relative to the transfer station.

[0080] refer to Figure 4The transfer assembly 220 specifically includes a transfer base plate 2204, and first support members 2201 are respectively arranged on both sides of each transfer station, and two first support members 2201 are respectively fixed on the transfer base plate 2204, and a plurality of first conveying rollers 2202 are rotatably connected between the two first support members 2201 along the second direction.

[0081] The stopping member is used to further limit the conveying state of the inspected part 600. The stopping member includes a lifting part arranged on the transfer bottom plate 2204 and a stopping end connected to the top of the lifting part. During the loading and conveying process of the inspected part 600, the lifting part corresponding to one end descends, and the position of the stopping end descends to be lower than the conveying roller, and the inspected part 600 is conveyed along the conveying roller.

[0082] Specifically, when the part to be inspected 600 is input from the feeding device 100, the stop member at the input end of the transfer station descends, and the stop member at the output end of the transfer station remains in place. When the loading is completed, the stop member at the input end of the transfer station rises to its original position.

[0083] Before the part to be inspected 600 on the transfer station is conveyed to the inspection station, the stop member corresponding to the output end of the transfer station descends to allow the part to be inspected to be conveyed without obstacles.

[0084] refer to Figure 6 , Figure 7 In some embodiments of the present application, the transition device 500 specifically includes a transition base plate 530, two second support members 510 spaced apart on the transition base plate 530, and a plurality of second conveying rollers 520 rotatably connected between the two second support members 510.

[0085] The transition bottom plate 530 is supported on the testing platform 310 to play a supporting role.

[0086] A controller 800 is also provided at the corresponding position of each conveying roller for controlling the forward and reverse rotation of the conveying roller, thereby realizing the loading and unloading function of the compressor housing waiting detection part 600.

[0087] refer to Figure 8 , Fig. 9 In some embodiments of the present application, the positioning device 400 includes a supporting base plate 440, a lifting support assembly, and a plurality of third conveying rollers 420 rotatably connected to the lifting support assembly.

[0088] The lifting support assembly specifically includes a lifting base plate 460 , two third support members 410 fixed on the lifting base plate 460 , and a lifting drive unit 450 . The lifting drive unit 450 is fixed on the support base plate 440 , and the lifting support assembly is lifted and lowered under the drive of the lifting drive unit 450 .

[0089] The first support member 2201, the second support member 510 and the third support member 410 are all channel steel structures, which are convenient for processing and installation.

[0090] The outer sides of the first support member 2201, the second support member 510 and the third support member 410 are all covered with a protective plate 900 to play a protective role.

[0091] In some embodiments of the present application, in order to make the position of the detected component 600 more accurate, at least one positioning component 430 is further provided on the supporting base plate 440, and the positioning component 430 is located between the two third supporting components 410, and the bottom of the tray component 610 is provided with a matching portion 611 adapted to each positioning component 430.

[0092] refer to Fig.10 The positioning member 430 specifically includes a positioning support and a positioning ball portion rotatably connected to the positioning support. The matching portion 611 is a spherical groove 612 formed at the bottom of the tray member 610 , and the size of the positioning ball portion is adapted to the size of the spherical groove 612 .

[0093] The lifting support assembly can be lifted and lowered relative to the supporting base plate 440 , and cooperates with the positioning member 430 to achieve accurate positioning of the to-be-detected member 600 .

[0094] In some embodiments of the present application, a position sensor 810 is further disposed on the supporting base plate 440 for detecting the transport position of the to-be-detected member 600 .

[0095] Specifically, during the conveying process of the part to be detected 600, the height of each third conveying roller 420 is flush with each second conveying roller 520 and each first conveying roller 2202. After the position sensor 810 detects that the part to be detected 600 is conveyed into place, each third conveying roller 420 is shut down, and the height of the third conveying roller 420 drops to the target height. The positioning member 430 is connected to the matching portion 611 to further position the part to be detected 600 to the detection position. The positioning is more precise, which is beneficial to improving the detection accuracy.

[0096] In some embodiments of the present application, a control system 700 is also included, which is connected to the measuring machine 320, the driving member 240, the lifting drive unit 450, the stop member, the position sensor 810 and the signals of each conveying roller to realize intelligent control of the detection and transportation of the inspected member 600.

[0097] The control system can also automatically save and count the test data results. At the same time, if combined with statistical analysis software, statistical analysis of measurement features can be realized. According to the results of the statistical analysis, the compensation value can be fed back to the machining equipment for real-time adjustment of the machining parameters. The entire detection process does not require human intervention, which greatly improves product accuracy consistency and detection efficiency and reduces labor costs. The specific control of the control system and the data storage process are existing technologies and will not be described in detail here.

[0098] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0099] The above is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A detection and delivery system, characterized in that: include: A detection device, comprising a detection platform and a measuring machine arranged on the detection platform, wherein a detection position is formed below the measuring machine; A positioning device, which is arranged at the detection position and is used to support the part to be detected; A loading and unloading device, comprising an operating table and a transfer assembly movably connected to the operating table, wherein the transfer assembly comprises at least one transfer station, and the corresponding transfer station is used to transport the to-be-tested parts to the positioning device or to receive the completed parts transported back from the positioning device; Wherein, the transfer station and the positioning device are both provided with a plurality of conveying rollers, and the rotation axes of the conveying rollers are parallel.

2. The detection and conveying system according to claim 1, characterized in that: It also includes a transition device, which is arranged between the positioning device and the loading and unloading device, and is used to transport the parts to be inspected from the transfer station to the positioning device, or to transport the inspected parts from the positioning device to the transfer station.

3. The detection and conveying system according to claim 2, characterized in that: The transfer assembly includes a transfer bottom plate, on which a plurality of transfer stations are arranged along a conveying direction perpendicular to the part to be inspected; a first support member is respectively arranged on both sides of each of the transfer stations, the bottom of the first support member is fixed on the transfer bottom plate, and a plurality of first conveying rollers are rotatably connected between two of the first support members.

4. The detection and conveying system according to claim 1, characterized in that: A guide rail portion is disposed on the operating table, and a guide portion adapted to the guide rail portion is disposed below the transfer component. The transfer component moves relative to the operating table under the action of a driving member.

5. The detection and conveying system according to claim 1, characterized in that: Limiting mechanisms are also provided at both ends of the operating platform along the moving direction of the transfer assembly to limit the maximum displacement of the transfer assembly.

6. The detection and conveying system according to claim 1, characterized in that: Along the conveying direction of the to-be-detected parts, stop members are respectively arranged at both ends of each transfer station, and the stop members are configured to be able to rise and fall relative to the transfer station.

7. The detection and delivery system according to claim 3, characterized in that: The transition device comprises a transition bottom plate, two second support members spaced apart on the transition bottom plate, and a plurality of second conveying rollers rotatably connected between the two second support members.

8. The detection and conveying system according to claim 7, characterized in that: The positioning device includes a supporting bottom plate, a lifting support assembly, and a plurality of third conveying rollers rotatably connected to the lifting support assembly; The lifting support assembly includes a lifting base plate, two third support members fixed on the lifting base plate, and a lifting drive unit, wherein the lifting drive unit is fixed on the support base plate, and the lifting support assembly is lifted and lowered under the drive of the lifting drive unit.

9. The detection and conveying system according to claim 8, characterized in that: The part to be detected is supported on the conveying roller by a pallet part. At least one positioning part is also arranged on the supporting bottom plate. The positioning part is located between the two third supporting parts. The bottom of the pallet part is provided with a matching part matched with each positioning part.

10. The detection and delivery system according to claim 9, characterized in that: A position sensor is also provided on the support bottom plate for detecting the transport position of the part to be detected. During the conveying process, the height of each of the third conveying rollers is flush with each of the second conveying rollers and each of the first conveying rollers. During the detection process, the height of the third conveying rollers drops to the target height, and the positioning member is connected to the matching portion.

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