CN206002457U - Noble metal check machine - Google Patents

Abstract

The utility model relates to a precious metal inspection machine, which comprises a coin input channel, an image processing module and a main control module. A coin input component, a coin clamping mechanism, a coin detection mechanism, a material output component and a waste coin tray are sequentially arranged on the coin input channel Mechanism, the coin holding mechanism is mainly composed of a coin feeding device, a coin holding device and a rotating device. The rotating device includes a rotating motor and a turntable installed on the rotating motor. The clamping fixture, the waste coin loading mechanism includes two slide rails, a feed sensor and a micro-motion sensor, the two slide rails are symmetrically arranged and a supporting plate is slidably connected to the two sliding rails, and the supporting plate is fixedly connected to the screw rod. The screw is driven by the screw motor, and at least two waste coin trays are set on the supporting plate, and several partition plates are evenly arranged on the waste coin tray along its width direction, and the waste coin tray is divided into several rows of coin storage parts of the same size . The utility model has the advantages that the structure of the whole machine is compact and the occupied area is small.

Description

Precious metal inspection machine

technical field

The utility model relates to a precious metal inspection machine, which belongs to the technical field of coin inspection equipment.

Background technique

According to the applicant's understanding, coin production technology is constantly developing, and the automation and efficiency of finished coin manufacturing, printing and packaging processes are also improving. Qualified quality has established strict criteria for judging. However, waste and unqualified products are inevitable in the coin production process. For a long period of time, the factory inspection of coins is carried out manually, which requires a large investment, high labor intensity, and unstable inspection quality. . At present, the banknote printing and minting industry is vigorously developing the automation technology of inspection and sealing, and the equipment using machine vision is also constantly being updated.

After retrieval, it was found that the Chinese patent No. 2013101536007 discloses a surface quality inspection system for finished coins, which can realize automatic inspection and automatic rejection of the surface quality of the front and back of coins. The system includes a coin input channel, an image processing module and a main control module. The coin input channel is provided with a coin input turntable, a coin detection device, etc. The coin detection device is equipped with a detection platform, a camera and a light source. The detection platform includes a coin slideway and a coin detection device. Reflector. In the process of coin conveying, two or more coins often stick together, and the above-mentioned patent is to complete the pattern collection of the entire coin through the line-scan camera mosaic. During the mosaic process, it is easy to have defects such as graphic misalignment and black shadows. affect the test results.

The tray loading device of the existing coin checking machine is usually provided with several trays on the belt conveyor, each tray has multiple rows of coin storage parts, the trays are driven by the belt on the belt conveyor to move in one direction, and a tray is filled with a row of coins Then move to the next row of the tray and continue loading until one tray is full, then move to the next tray, and proceed sequentially, using a cyclic method for loading, this way the interval between the first row and the last row is longer, time-consuming Long, low efficiency, will affect the quality of the plate, especially this kind of mechanism has a large volume, a large floor space, a complicated structure, and is not easy to maintain.

Utility model content

The purpose of the utility model is to propose a precious metal inspection machine with a compact structure and a small floor space in view of the defects in the prior art.

In order to achieve the above purpose, the precious metal inspection machine of the present utility model includes a coin input channel, an image processing module and a main control module. A coin input component, a coin clamping mechanism, a coin detection mechanism, a material output component and a waste The coin loading mechanism and the coin holding mechanism are mainly composed of a coin feeding device, a coin holding device and a rotating device. The rotating device includes a rotating motor and a turntable installed on the rotating motor. A jig for clamping coins. The jig includes a chuck, a guide seat fixed with the chuck and a guide groove opened on the guide seat. A first block that can slide back and forth along the wall of the guide groove is installed in the guide groove. The head end of a clamping block fixes the second clamping block, the tail of the first clamping block is fixedly equipped with a stopper, the stopper is connected with one end of the extension spring, and the other end of the extension spring is fixedly connected with the guide seat, and the extension spring is formed by Driven by an air cylinder installed on the turntable; the coin detection mechanism includes a first coin detection part, a second coin detection part, a third coin detection part and a fourth coin detection part, the first, second, third and fourth coin detection parts It includes a camera bracket and two cameras installed on the camera bracket. The two cameras are symmetrically arranged on the upper and lower sides of the fixture, and the viewfinder end face of the camera is placed perpendicular to the chuck of the fixture; the waste coin loading mechanism includes two slide rails, Screw, screw motor, feed sensor and micro-motion sensor, two slide rails are symmetrically arranged and a supporting plate is slidably connected to the two sliding rails, the supporting plate is fixedly connected with the screw rod, the screw rod is driven by the screw rod motor, and the supporting plate At least two waste coin trays are arranged on the board, and several partition plates are evenly arranged on the waste coin tray along its width direction, and the waste coin tray is divided into several rows of coin storage parts of the same size.

The utility model adopts a clamping mechanism capable of preventing the coin from sticking to clamp the coin. Four cameras are respectively arranged on the upper and lower sides of the clamping mechanism. The camera adopts a 4 million-pixel area array camera. The reverse image can not only effectively prevent scratches on the surface of the coin, but also hold the coin more stably and reliably.

Preferably, the collet has a circular arc concave surface, and a nearly circular clamping space is formed between the circular arc concave surface and the end surface of the second clamping block. The cross section of the end of the clamping space corresponding to the circular arc concave surface is V-shaped, corresponding to the second The section at one end of the clamping block is straight.

The above-mentioned structure uses a three-point clamping method to clamp the edge of the coin, and can detect the front and back of the coin at the same time. At the same time, due to the method of clamping the edge of the coin, there is no block directly above (directly below) the coin, so an area array camera can be used for one-time forming and image acquisition, which saves the possible problems of the second mosaic, and can collect images at the same time. , greatly improving production efficiency.

Preferably, the coin input device includes a fixed base, and an adjustment plate is respectively provided on both sides of the fixed base, and a rotating plate with a certain inclination angle is arranged between the two adjusting plates, and the rotating plate is vertically connected to a mounting plate through a supporting column, and the mounting plate There is a slide plate in the middle of the slide plate, and guide plates that can be moved and adjusted laterally are symmetrically arranged on the left and right sides of the slide plate. A guide channel is formed between the two guide plates. The lower part of the guide channel is equipped with an upper and lower shift fork driven by a cylinder. There is a bracket in the middle, and an air blowing nozzle is arranged on the bracket, and the blowing direction of the air blowing nozzle faces the guide channel; the coin holding device includes a supporting base, which is connected with the supporting plate through the cylinder, and the supporting plate is provided with an oval cross-section. backing plate.

Preferably, the coin feeding assembly includes a first conveyor, the first conveyor includes a first belt rack and a first coin feeding belt installed on the first belt rack, and the first belt rack passes through the first fixing frame and the first adjuster Connect, the first adjuster is used to regulate the angle of inclination of the first coin-feeding belt, the entrance of the first coin-feeding belt is provided with the first sorting coin bar bracket, the first sorting coin bar support is installed with the first sorting coin bar, the first coin sorting bar support is equipped with The outlet of a coin feeding belt is connected with the coin feeding device; the discharge assembly includes a second conveyor, the second conveyor includes a second belt rack and a second coin feeding belt installed on the second belt rack, and the second belt rack passes through The second fixed frame is connected with the second adjuster, and the second adjuster is used to adjust the inclination angle of the second coin-feeding belt. The second coin sorting bar is installed, and the entrance of the second coin feeding belt is connected with the rotating device.

Further, the coin feeding assembly, the coin holding mechanism, the coin detecting mechanism, the discharging assembly and the waste coin loading mechanism are all installed on the main frame.

Further, a third conveyor is arranged between the waste coin loading mechanism and the rotating device. The third conveyor includes a third belt rack and a third coin feeding belt installed on the third belt rack. The third belt rack passes through the third belt rack. Fixed mount is connected with the 3rd adjuster, and the 3rd adjuster is used for adjusting the inclination angle of the 3rd coin-feeding belt, and the entrance of the 3rd coin-feeding belt is provided with the 3rd sorting coin bar support, is installed on the 3rd sorting coin bar support The third coin bar, the outlet of the third coin feeding belt is provided with a feeding sensor.

Still further, the feed sensor is connected to the main control module, the micro-motion sensor is arranged under the supporting plate, and the micro-motion sensor is connected to the main control module.

Furthermore, the slide rail is fixed on the slide rail bracket, the slide rail bracket is installed on the slide rail fixing plate, and the slide rail fixing plate and the main frame are installed at an angle.

Further, the camera is provided with an image output terminal for connecting to an image processing module, and the image processing module is connected to the main control module.

Furthermore, the main control module controls the operation of the first coin feeding belt, the second coin feeding belt, the third coin feeding belt, the turntable rotating motor, the coin detection mechanism and the waste coin loading mechanism.

The utility model has the advantages of compact structure, small footprint, convenient maintenance, up to 8 detection stations, significantly improved detection quality and high work efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the utility model.

FIG. 2 is a top view of FIG. 1 .

FIG. 3 is a side view of FIG. 1 .

Fig. 4 is a structural schematic diagram of the coin depositing device in the present invention.

Fig. 5 is a structural schematic diagram of another coin-inserting device in the present invention.

Fig. 6 is a structural schematic diagram of the coin holding device in the present invention.

FIG. 7 is a top view of FIG. 6 .

Fig. 8 is a structural schematic diagram of the rotating device in the present invention.

Fig. 9 is a schematic structural view of the fixture in the present invention.

FIG. 10 is a top view of FIG. 9 .

Fig. 11 is a structural schematic diagram of the waste coin loading mechanism in the utility model.

Fig. 12 is a sectional view taken along line A-A of Fig. 11 .

Fig. 13 is a cross-sectional view taken along line B-B in Fig. 11 .

Fig. 14 is a schematic diagram of the installation of the waste coin loading mechanism in the utility model.

detailed description

Example 1

The precious metal inspection machine of this embodiment, its structure is shown in Figure 1 to Figure 3, comprises coin input channel, image processing module and main control module, is provided with input coin assembly 2, coin clamping mechanism, coin detection in sequence on the coin input channel Mechanism, material discharging assembly 3 and waste coin loading mechanism 4, coin input assembly 2, coin clamping mechanism, coin detection mechanism, material discharging assembly 3 and waste coin loading mechanism 4 are all installed on the main frame 1. The coin feeding assembly 2 includes a first conveyor 201, and the first conveyor 201 includes a first belt rack and a first coin conveyor belt installed on the first belt rack, and the first belt rack is connected to the first adjustment by the first fixed mount 204. The first adjuster is used to adjust the inclination angle of the first coin feeding belt. The first coin sorting bar support 202 is provided at the entrance of the first coin transporting belt, and the first coin sorting bar support 202 is installed with the first sorting coin Bar 203, the outlet of the first coin feeding belt is connected with the coin feeding device 5 of the coin clamping structure.

The coin holding mechanism is mainly composed of a coin feeding device 5, a coin holding device 6 and a rotating device 7. The structure of the coin-in device 5 is as shown in Figure 4, including a fixed base 510, an adjustment plate 501 is respectively arranged on both sides of the fixed base 510, and a certain inclination angle is arranged between the two adjustment plates 501 (the optimal inclination angle is 22 °), the rotating plate 511 is vertically connected to a mounting plate 513 through the support column 512, the middle part of the mounting plate 513 is provided with a sliding plate 505, the sliding plate 505 adopts a polytetrafluoroethylene plate that can prevent wear, and the left and right sides of the sliding plate 505 are symmetrical The guide plate 502 that can be moved laterally is arranged, and a guide channel is formed between the two guide plates 502. There is a guide gap at the coin inlet of the guide plate 502. The guide plate 502 is also provided with a trigger sensor bracket 507, which is installed on the trigger sensor bracket 507. There is a trigger sensor, and the trigger sensor is used to trigger the expansion and contraction of the cylinder that controls the movement of the upper shift fork 504 and the lower shift fork 506. The distance between them is generally the diameter of a coin, the upper shift fork 504 is connected with the first cylinder 509, and the lower shift fork 506 is connected with the second cylinder 514, so that the first cylinder 509 and the second cylinder 514 respectively drive the upper shift fork 504 1. The lower shift fork 506 is perpendicular to the slide plate 505 for telescopic movement. A bracket is arranged in the middle of the mounting plate 513, and an air blowing nozzle 503 is arranged on the bracket. Consistently, the air blowing nozzle 503 is connected with an air compressor through a flexible pipe to provide power for the coin to slide down. In addition, the guide passage can also be covered with a limiting plate 508. A single coin output gap is provided between the limiting plate 508 and the slide plate 505. The height of the single coin output gap is less than the thickness of two coins, so that only one coin can pass through at the same time. There is a square gap below the limiting plate 508, and the limiting plate 508 is located at the square gap and is provided with a trigger sensor bracket 507. The trigger sensor bracket 507 is equipped with a trigger sensor, and the trigger sensor is used to trigger and control the movement of the upper shift fork 504 and the lower shift fork 506. Cylinder telescopic (see figure 5).

The structure of the coin holder 6 is shown in Figure 6 and Figure 7, comprising a support base 604, the support base 604 is provided with a third cylinder 603, the third cylinder 603 is connected with the supporting plate 601 by the cylinder telescopic shaft, on the supporting plate 601 A backing plate 602 with an elliptical cross-section is provided, and the edge of the backing plate 602 is arc-cleared. Since the surface of the coin has uneven lines, the arc-clearing edge of the backing plate 602 is used to hold the coin flat to ensure that the coin is held horizontally by the fixture. Clamping for easy detection.

The structure of the rotating device 7 is shown in FIGS. 8 to 10 , including a rotating motor 707 and a turntable 710 mounted on the turning motor 707 . Seven clamps for horizontally holding coins are evenly distributed on the turntable 710 along its circumferential direction. The structure of the fixture is shown in Figures 9 and 10, including a chuck 702, a guide seat 701 fixed with the chuck 702 and a guide groove opened on the guide seat 701, and a guide groove is installed in the guide groove that can move along the groove wall of the guide groove. The first block 703 that slides back and forth, the head end of the first block 703 fixes the second block 704, the tail of the first block 703 is fixedly equipped with a stopper 705, the stopper 705 is connected with one end of the tension spring 706, The other end of tension spring 706 is fixedly connected with guide seat 701, and the middle part of rotating disk 710 is provided with column, and fan-shaped mounting plate 708 is installed on the column, and fan-shaped mounting plate 708 is provided with vertically downward baffle plate 709, and baffle plate 709 uses Jumping when preventing coins from sliding down on the backing plate 602 of the coin holder, the edge of the fan-shaped mounting plate 708 is provided with a fourth cylinder 711, a fifth cylinder 712, and a sixth cylinder 713. These three cylinders are respectively connected with the seven clamps. The stopper 705 contacts, so that the above-mentioned three cylinders can drive the extension spring 706 to expand and contract. The clamping head 702 has a circular arc concave surface, and a nearly circular clamping space is formed between the circular arc concave surface and the end face of the second clamping block 704. The section of the end of the clamping space corresponding to the circular arc concave surface is V-shaped, which corresponds to the second clamping space. The cross-section of one end of the end face of the block 704 is in-line, the V-shaped end is close to the slide plate 505, and the in-line end is away from the slide plate 505, which can effectively prevent the coin from bouncing when it collides with the support pad 602 of the coin holding device and prevents the coin from jumping out. fixture.

The coin detecting mechanism comprises a first coin detecting part 8, a second coin detecting part 9, a third coin detecting part 10 and a fourth coin detecting part 11, the first coin detecting part 8, the second coin detecting part 9, the third coin detecting part Component 10 and the fourth coin detection component 11 all include a camera bracket and two cameras installed on the camera bracket. The two cameras are arranged symmetrically on the upper and lower sides of the jig, and the viewfinder end face of the camera is placed perpendicular to the chuck 702 of the jig.

The discharge assembly 3 comprises a second conveyer 301, and the second conveyer 301 comprises a second belt rack and a second coin-feeding belt installed on the second belt rack, and the second belt rack is connected with the second adjustment by the second fixed mount 304. The second adjuster is used to adjust the inclination angle of the second coin-feeding belt. The entrance of the second coin-feeding belt is provided with a second coin sorting bar bracket 302, and a second coin sorting bar bracket 302 is installed on the second coin sorting bar support 302. Bar 303, the entrance of the second coin feeding belt is connected with the rotating device 7.

The structure of waste coin loading mechanism 4 is as shown in Figure 11 to Figure 14, comprises two slide rails 401, screw mandrel 403, screw mandrel motor 404, the 3rd coin feeding belt 408, feed sensor 409 and micro-motion sensor, wherein , the feed sensor 409 is used to collect the number of coins transported by the coin conveyor belt 408 in real time and transmit the collected coin number to the main control module, and then the main control module judges the waste coin tray according to the number of coins collected by the feed sensor 409 Whether a certain row of coin storage parts 407 is full; the micro-motion sensor is arranged under the supporting plate 402, and the micro-motion sensor is used to collect the micro-movement signal generated by the waste coin tray on the supporting plate 402, and transmit the micro-motion signal to the main control module, and then the control module judges whether the waste coin tray on the supporting plate 402 is in place according to the micro-motion signal collected by the micro-motion sensor. The main frame 1 and the slide rail fixing plate 412 are installed at an angle through a bracket 426, and two slide rail brackets 411 are symmetrically installed on the slide rail fixing plate 412, and the slide rail bracket 411 is fixed with a slide rail 401, and on the slide rail fixing plate Both ends of 12 are respectively provided with a first mounting plate 13 and a second mounting plate 14 with an L-shaped cross section. Two slide rails 401 are slidingly connected with a supporting plate 402, and the supporting plate 402 is fixedly connected with the screw mandrel 403, that is, the supporting plate 402 is fixedly connected with the nut support 418 sleeved on the screw mandrel 403, and the head of the screw mandrel 403 is installed A screw support 416 is arranged, and a bearing block assembly 417 is installed at the afterbody. The head of screw mandrel 403 is connected with the output shaft transmission of motor 404 by shaft coupling 415, the first waste coin dish 405 and the second waste coin dish 406 that are arranged in parallel are set on supporting plate 402, the first waste coin dish 405, the second waste coin dish 406 The material of the second waste coin tray 406 is polytetrafluoroethylene, the cross section of the first waste coin tray 405 and the second waste coin tray 406 is rectangular, and 8 points are evenly arranged along the width direction of the first waste coin tray 405. Divider divides the first waste coin tray 405 into nine rows of coin receiving parts 407 of the same size. On the second waste coin tray 406, five partition plates are evenly arranged along its width direction, and the second waste coin tray 406 Divided into six rows of coin receiving parts 407 of the same size, the bottom of the supporting plate 402 is provided with a first micro-motion sensor 424 corresponding to the first waste coin tray 405, and the bottom of the supporting plate 402 is provided with a second micro-motion sensor 424 corresponding to the second waste coin tray 406. Motion sensor 425. The head ends of the first waste coin tray 405 and the second waste coin tray 406 are provided with coin inlets corresponding to the coin receiving parts 407, and the ends are provided with retaining strips 419 for preventing coins from jumping out of the waste coin trays.

A third conveyor 427 is arranged between the waste coin loading mechanism 4 and the rotating device 7, the third conveyor 427 includes a third belt rack and a third coin feeding belt 408 installed on the third belt rack, the third belt rack passes through The 3rd fixed mount is connected with the 3rd adjuster, and the 3rd adjuster is used for regulating the inclination angle of the 3rd coin-feeding belt 408, and the entrance of the 3rd coin-feeding belt 408 is provided with the 3rd coin bar support 428, and the 3rd coin is managed The third coin sorting bar 429 is installed on the bar bracket 428, and the outlet of the third coin feeding belt 408 is connected with the feed sensor 409 through the sensor bracket 430. In addition, a mounting bracket 423 is provided on the side of the motor 404 on the slide rail fixing plate 412, the mounting bracket 423 is connected to the tow cable 420 through the tow cable fixing bracket 421, and the mounting bracket 423 is also connected to the first micro motion sensor through the micro motion sensor bracket 422. 424 connection. One end of the streamer 420 is connected to the supporting plate 402 , and the other end is connected to the slide rail fixing plate 412 . The function of the streamer 420 is to facilitate the passage of the control wires of the two micro-sensors therethrough.

During work, the main control module controls the operation of the first coin-feeding belt, the second coin-feeding belt, the third coin-feeding belt 408, the turntable rotating motor 707, coin detection mechanism and waste coin loading mechanism 4. The coins to be detected are transported into the coin-in device 5 through the coin input assembly 2, the first cylinder 509 of the coin-in device 5 controls the upper shift fork 504 to move, and the second cylinder 514 controls the lower shift fork 506 to move, so that the upper shift fork 504, The lower shift fork 506 is respectively stuck in the middle gap of the two coins, and then the coins that are connected together without overlapping are separated through this up and down fluctuation, and the coins are slid to the bottom of the coin holding device 6 by using the self-weight of the coins. On the backing plate 602, it is then clamped by the clamp of the rotating device 7. After the clamp clamps the coin, it makes a circular motion with the rotation of the turntable 710, and the coin is transported to four coin detection stations. The first coin detection component 8, the second The cameras of two coin detection parts 9, the 3rd coin detection part 10 and the 4th coin detection part 11 collect respectively the up and down two sides image of coin, the camera is provided with the image output end that is used to connect image processing module, and image processing module is to from camera The obtained coin image is processed to identify whether the surface quality of the coin is qualified, and the identification result is sent to the main control module, and the main control module controls the gripping action of the clamp according to the received identification result. Qualified products are transported to the next process through the discharge assembly 3, and unqualified products are processed by the waste coin loading mechanism 4.

When the waste coin loading mechanism 4 is loaded, the first waste coin tray 405 and the second waste coin tray 406 will be placed on the supporting plate 402, and all coin receiving parts 407 on the first waste coin tray 405 are arranged according to the order from left to right. The order to the right is numbered successively, and marked as one, two, three, four, five, six, seven, eight, nine, and all coin receiving parts 407 on the second waste coin tray 406 are in order from left to right Number them sequentially and mark them as one, two, three, four, five, six. Secondly, the control module controls the motor 404 to drive the screw rod 403 to move, and the screw rod 403 drives the supporting plate 402 to move left and right, so that the first waste coin tray 405 on the supporting plate 402 is in place, and the first waste coin tray 405 is in accordance with eight→six→four→two → One→Three→Five→Seven→Nine, after finishing the loading of the first waste coin tray 405, manually remove the waste coin tray filled with coins, and place the empty waste coin tray on the pallet 402 The position of the first waste coin tray 405 on the top. Then, the control module controls the motor 404 to drive the screw mandrel 403 to move to the right, and the screw mandrel 403 drives the supporting plate 402 to move left and right, so that the second waste coin tray 406 on the supporting plate 402 is in place, and the second waste coin tray 406 moves according to one→three→five →Six→Four→Two sequence loading, after the second waste coin tray 406 is finished loading, manually remove the waste coin tray full of coins, and place the empty waste coin tray on the supporting plate 402 for the second waste coin The location of the disc 406 . At last, repeat above-mentioned operation, carry out waste coin loading constantly.

In addition, before the first waste coin tray 405 repeats the loading operation, the control module collects the micro-motion signal of the first micro-motion sensor 424, and judges whether the first waste coin tray 405 is in place according to the micro-motion signal. When the tray 405 is in place, repeat the loading operation of the first waste coin tray 405. If the first waste coin tray 405 is not in place, check the reason and manually judge whether the operation needs to be stopped. Before the second waste coin tray 406 repeats the loading operation, the control module needs to collect the micro-motion signal of the second micro-motion sensor 425, and judge whether the second waste coin tray 406 is in place according to the micro-motion signal. 406 is in place, repeat the loading operation of the second waste coin tray 406, if the second waste coin tray 406 is not in place, check the reason and manually judge whether to stop the operation.

In the loading process, the loading operation of the next row of coin storage parts 407 can only be carried out after the last column of coin storage parts 407 is filled with coins. The maximum number of stored coins is set to a predetermined value, and then when a row of coin storage parts 407 is loaded, the main control module collects the number of conveyed coins from the feed sensor 409, and finally the main control module judges whether the conveyed coin number collected reaches the predetermined number value, if reached, this row of coin storage parts 407 has been filled, and the loading operation of the next row of coin storage parts 407 is carried out, if not yet reached, this row of coin storage parts 407 continues to store coins until it is full.

In addition to the above embodiments, the utility model can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model.

Claims (10)

1. A precious metal inspection machine, comprising a coin input channel, an image processing module and a main control module, characterized in that a coin input component, a coin clamping mechanism, a coin detection mechanism, a material discharge assembly and Waste coin loading mechanism, the coin holding mechanism is mainly composed of a coin input device, a coin holding device and a rotating device. The rotating device includes a rotating motor and a turntable installed on the turning motor. A set of clamps for horizontally clamping coins are evenly distributed. The clamps include a chuck, a guide seat fixed with the chuck and a guide groove opened on the guide seat. The first block that slides back and forth on the groove wall, the head end of the first block fixes the second block, the tail of the first block is fixedly equipped with a stopper, and the stopper is connected with one end of the tension spring, so The other end of the extension spring is fixedly connected with the guide seat, and the extension spring is driven by an air cylinder installed on the turntable; the coin detection mechanism includes a first coin detection component, a second coin detection component, and a third coin detection component and the fourth coin detection part, the first, second, third and fourth coin detection parts include a camera bracket and two cameras installed on the camera bracket, the two cameras are symmetrically arranged on the upper and lower sides of the clamp, and the cameras The end face of the viewfinder is placed perpendicular to the chuck of the fixture; the waste coin loading mechanism includes two slide rails, a screw, a screw motor, a feed sensor and a micro-motion sensor, the two slide rails are symmetrically arranged and the two slide rails A supporting plate is slidably connected on the rail, and the supporting plate is fixedly connected with the screw rod, and the screw rod is driven by a screw motor. A plurality of partition plates are evenly arranged in the width direction, and the waste coin tray is divided into several rows of coin storage parts of the same size. 2. The precious metal inspection machine according to claim 1, wherein the chuck has an arc concave surface, and a nearly circular clamping space is formed between the arc concave surface and the end surface of the second clamping block, so that The cross-section of one end of the clamping space corresponding to the circular arc concave surface is V-shaped, and the cross-section of one end corresponding to the second clamping block is S-shaped. 3. The precious metal inspection machine according to claim 1, wherein the coin input device comprises a fixed base, an adjustment plate is provided on both sides of the fixed base, and a certain inclination is provided between the two adjustment plates. Angled rotating plate, the rotating plate is vertically connected to a mounting plate through the support column, the middle part of the mounting plate is provided with a sliding plate, and the left and right sides of the sliding plate are symmetrically arranged with guide plates that can be moved laterally. A guide channel is formed between them, the lower part of the guide channel is provided with an upper and lower shift fork driven by a cylinder, a bracket is provided in the middle of the installation plate, and an air blowing nozzle is provided on the support, and the blowing nozzle of the air blowing nozzle The air direction is towards the guide channel; the coin holding device includes a supporting base, the supporting base is connected with the supporting plate through the air cylinder, and the supporting plate is provided with an elliptical cross-section. 4. The precious metal inspection machine according to claim 1, wherein the coin feeding assembly includes a first conveyor, and the first conveyor includes a first belt rack and a first belt rack installed on the first belt rack. Coin feeding belt, the first belt frame is connected with the first adjuster through the first fixed frame, the entrance of the first coin feeding belt is provided with a first coin sorting bar bracket, and on the first coin sorting bar bracket The first coin sorting strip is installed, and the outlet of the first coin input belt is connected with the coin input device; the discharge assembly includes a second conveyor, and the second conveyor includes a second belt frame and is installed on the second The second coin-feeding belt on the belt rack, the second belt rack is connected with the second adjuster through the second fixed mount, the entrance of the second coin-feeding belt is provided with a second sorting coin bar support, and the first The second coin bar support is equipped with a second coin bar, and the entrance of the second coin conveyor belt is connected with the rotating device. 5. The precious metal inspection machine according to claim 4, characterized in that, the coin feeding assembly, the coin holding mechanism, the coin detecting mechanism, the discharging assembly and the waste coin loading mechanism are all installed on the main frame. 6. The precious metal inspection machine according to claim 5, characterized in that, a third conveyor is set between the waste coin loading mechanism and the rotating device, and the third conveyor includes a third belt rack and a The third coin-feeding belt on the three belt racks, the third belt rack is connected with the third adjuster through the third fixed frame, the entrance of the third coin-feeding belt is provided with a third coin sorting bar support, and the third belt rack is connected with the third adjuster. A third coin sorting bar is installed on the third coin sorting bar bracket, and a feeding sensor is provided at the outlet of the third coin feeding belt. 7. The precious metal inspection machine according to claim 6, wherein the feed sensor is connected to the main control module, the micro-motion sensor is arranged under the supporting plate, and the micro-motion sensor is connected to the main control module . 8. The precious metal inspection machine according to claim 7, wherein the slide rail is fixed on a slide rail bracket, the slide rail bracket is mounted on a slide rail fixing plate, and the slide rail fixing plate and the main frame installed at an angle between them. 9. The precious metal inspection machine according to claim 8, wherein the camera is provided with an image output terminal for connecting to an image processing module, and the image processing module is connected to the main control module. 10. The precious metal inspection machine according to claim 9, wherein the main control module controls the first coin-feeding belt, the second coin-feeding belt, the third coin-feeding belt, the rotary motor of the turntable, the coin detection mechanism and the waste The operation of the coin loading mechanism.