Turn-milling nut part conveying device

Abstract

The utility model discloses a turn-milling nut part transportation device which comprises a base, the front end and the rear end of the upper surface of the base are provided with a collecting groove body and a detection table respectively, and one side of the detection table is provided with a belt conveyor used for conveying nut parts. A transparent plate for placing a nut part to be detected is arranged on one side of the surface of the detection table, and a first CCD visual camera and a second CCD visual camera which are used for detecting the external dimension of the nut part to be detected are respectively arranged above and below the transparent plate. When the nut part conveying device is used for conveying nut parts subjected to turn-milling machining, qualified nut parts and unqualified nut parts can be counted, and the unqualified nut parts can be removed, so that a worker can conveniently calculate the machining qualification rate of one batch of nut parts; therefore, machining data of the numerical control turning and milling machine tool on the nut parts are adjusted, and the machining qualified rate of the nut parts of different batches is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to nut part production equipment technical field, concretely is a kind of turning and milling processing nut part transport device. BACKGROUND

[0002] Nut part is transported by conveying equipment before and after being processed by numerical control lathe milling machine, and after searching, patent announcement No.CN210280694U discloses nut conveying device, and its characterized in that, linear track and material taking assembly are included, nut feeding table and two nut machining lathes are arranged below linear track, two nut machining lathes are arranged on the left and right sides of nut feeding table respectively, material taking assembly is arranged on linear track and can move left and right and up and down, material taking assembly includes two mechanical hands, annular track is arranged on nut feeding table, a plurality of nut stringing rods are arranged on annular track, nut stringing rod is moved along annular track by chain, two mechanical hands are arranged on material taking assembly to load and take material, the back and forth between feeding table and nut machining lathe is reduced once, working time is shortened, and working efficiency is improved;A group of material taking assemblies are used for alternately loading and taking material for two lathes, and the processing time is not delayed due to loading and taking material;Nut feeding table can automatically supply nut embryo, and can also automatically collect processed nut.

[0003] When the existing nut part transport device conveys nut part after turning and milling processing, the nut part is generally transferred to the conveying equipment by mechanical hand for conveying, and the appearance and size of the nut part can be detected by detection equipment during conveying on the conveying equipment, and unqualified nut part can be rejected, however, after a batch of nut parts is conveyed, the qualified nut part and unqualified nut part need to be counted manually by workers to calculate the qualified rate, this way increases the labor of workers, and after the appearance and size of the nut part are detected by detection equipment, the nut part will generate some impurities at the detected position, and when there are more impurities at the detected position of the nut part, the detection effect of the appearance and size of the nut part by detection equipment will be affected, therefore, a turning and milling processing nut part transport device is designed. UTILITY MODEL CONTENTS

[0004] In view of the defects or deficiencies of turning and milling processing nut part transport device, the utility model aims at providing a turning and milling processing nut part transport device, which can count qualified nut part and unqualified nut part and reject unqualified nut part, so as to facilitate workers to calculate the qualified rate of a batch of nut parts, so as to adjust the data of nut part processed by numerical control lathe milling machine, and ensure the qualified rate of different batches of nut parts.

[0005] To achieve the above-mentioned utility model purposes, the utility model adopts the following technical scheme:

[0006] The utility model provides a kind of nut part transport device of turning and milling processing, including base, the upper surface front end and rear end of base are provided with collecting groove body and detection table respectively, the side of detection table is provided with the belt conveyor for conveying nut part, the surface side of detection table is provided with the transparent plate for placing nut part to be detected, the upper side and lower side of transparent plate are provided with first CCD vision camera and second CCD vision camera for detecting the appearance size of nut part to be detected respectively;

[0007] The side outer wall of detection table is provided with second material guiding component for guiding detection qualified nut part to belt conveyor and counting detection qualified nut part, the side of detection table front end wall is provided with first material guiding component for guiding detection unqualified nut part to collecting groove body and counting detection unqualified nut part, the other side of the upper surface of detection table is provided with pushing mechanism for pushing detection qualified nut part to second material guiding component and cleaning transparent plate, the rear end of detection table is provided with pushing component for pushing detection unqualified nut part to first material guiding component.

[0008] Preferably, the first CCD vision camera is installed at the front end of the lower surface of the top plate, the top plate is installed at the top end of the support plate, the bottom end of the support plate is installed at one side of the rear end of the upper surface of the base, the second CCD vision camera is located directly below the first CCD vision camera, and the second CCD vision camera is installed on the upper surface of the base.

[0009] Preferably, the pushing component is composed of a first reciprocating cylinder and a first push plate, the first reciprocating cylinder is installed on the rear end face of the support plate, and the front end of the first reciprocating cylinder penetrates the end face of the support plate and is connected with the first push plate.

[0010] Preferably, the first material guiding component and the second material guiding component are both composed of a side baffle, a counting sensor and an inclined material guiding plate, the side baffles are installed on both sides of the upper surface of the inclined material guiding plate, the counting sensor is arranged on the outer wall of one side of the side baffle, and the counting sensor is located on the inner side between two adjacent side baffles.

[0011] Preferably, one end of the inclined material guiding plate on the first material guiding component is installed on the front end wall of the detection table, and the other end of the inclined material guiding plate on the first material guiding component is located above the collecting groove body, one end of the inclined material guiding plate on the second material guiding component is installed on the side outer wall of the detection table, and the other end of the inclined material guiding plate on the second material guiding component is located above one end of the belt conveyor.

[0012] Preferably, a control box is mounted on the front end of the bottom surface of the detection table, and an audible and visual alarm is mounted on the bottom end of the control box.

[0013] Preferably, a mounting plate is arranged on the pushing mechanism, and the mounting plate is mounted on the other side of the upper surface of the detection table, a piston assembly is arranged above the outer wall of the mounting plate, a second reciprocating air cylinder is mounted below the outer wall of one side of the mounting plate, and the other end of the second reciprocating air cylinder penetrates through the outer wall of the mounting plate and is connected with a second push plate.

[0014] Preferably, a piston cylinder is arranged on the piston assembly, one end of the piston cylinder penetrates through the outer wall of the mounting plate, a ring-shaped protrusion is arranged on one side of the circumferential outer wall of the piston cylinder and is mounted on the outer wall of one side of the mounting plate, a rubber piston is arranged in the piston cylinder, the rubber piston is mounted on one end of a piston rod, and the other end of the piston rod is mounted on the outer wall of one side of the second push plate.

[0015] Preferably, an exhaust pipe and an air suction pipe are arranged on the other side of the circumferential outer wall of the piston cylinder, the exhaust pipe and the air suction pipe are respectively located at the rear end and the front end of the circumferential outer wall of the piston cylinder, a one-way valve is arranged on each of the exhaust pipe and the air suction pipe, the exhaust pipe is connected with an air inlet pipe through a conveying pipeline, the air inlet pipe is arranged on the rear end wall of a hollow exhaust plate, an exhaust hole is formed below the front end wall of the hollow exhaust plate, the hollow exhaust plate is mounted on one side of the rear end wall of the detection table, and the hollow exhaust plate is located below the first push plate.

[0016] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0017] 1、In the utility model, through a series of structure's cooperation setting, when the mechanical hand transports the nut part which has finished processing to the transparent plate, the first CCD vision camera and the second CCD vision camera can respectively carry out visual inspection from the top and the bottom of the nut part, when the first CCD vision camera or the second CCD vision camera visual inspection is unqualified to the nut part, the singlechip control of the control box in the setting first reciprocating cylinder on the push material assembly starts and makes the first reciprocating cylinder drive the first push plate and push the unqualified nut part into the first material guide assembly, the first material guide assembly can guide the unqualified nut part into the collecting groove, and the counting sensor on the first material guide assembly can also count the unqualified nut part, when the first CCD vision camera or the second CCD vision camera visual inspection is qualified to the nut part, the singlechip control of the control box in the setting second reciprocating cylinder on the push material mechanism starts and makes the second reciprocating cylinder drive the second push plate and push the qualified nut part into the second material guide assembly, the second material guide assembly can guide the qualified nut part into the belt conveyor and convey, and the counting sensor on the second material guide assembly can also count the qualified nut part, so that when the utility model conveys the nut part which has finished turning and milling, the qualified nut part and the unqualified nut part can be counted and the unqualified nut part can be rejected, and the staff can calculate the qualified rate of a batch of nut parts, so as to adjust the data of the nut part processed by the numerical control turning and milling machine, ensure the qualified rate of different batches of nut parts, and do not need artificial counting of a batch of qualified nut parts and unqualified nut parts.

[0018] 2、In the utility model, through a series of structure's cooperation setting, the second push plate reciprocating movement is driven by the second reciprocating cylinder, and the piston assembly is inhaled or exhausted during the reciprocating movement of the second push plate, the gas can be conveyed into the hollow exhaust plate through the conveying pipeline during the exhaust process of the piston assembly, the gas in the hollow exhaust plate is exhausted from the exhaust hole, and the gas exhausted from the exhaust hole blows to the upper surface of the transparent plate, so that the impurities remaining on the upper surface of the transparent plate can be blown to the outside, thereby avoiding the situation that the impurities remaining on the upper surface of the transparent plate are too much to affect the appearance and size detection effect of the first CCD vision camera and the second CCD vision camera on the nut part. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and the explanation thereof are used to explain the utility model, and do not constitute undue limitation on the utility model.

[0020] Figure 1 It is the whole three-dimensional structure of the utility model Figure 1 .

[0021] Figure 2 is the overall three-dimensional structure of the utility model Figure 2 .

[0022] Figure 3 is the structure diagram of the detection table of the utility model Figure 1 .

[0023] Figure 4 is the structure diagram of the detection table of the utility model Figure 2 .

[0024] Figure 5 is the structure diagram of the base of the utility model Figure 1 .

[0025] Figure 6 is the structure diagram of the base of the utility model Figure 2 .

[0026] Figure 7 is the structure diagram of the utility model push material mechanism Figure 1 .

[0027] Figure 8 is the structure diagram of the utility model push material mechanism Figure 2 .

[0028] Figure 9 is the sectional view of the piston assembly of the utility model.

[0029] Figure 10 is the structure diagram of the hollow exhaust plate of the utility model.

[0030] Figure 11 is the structure diagram of the first material guide assembly and the second material guide assembly of the utility model.

[0031] Figure 12 is the structure diagram of the utility model push material assembly.

[0032] In the figure:

[0033] 100, base; 110, support plate; 120, top plate; 130, first CCD vision camera; 140, collection groove body; 150, second CCD vision camera; 160, push material assembly;

[0034] 161, first reciprocating air cylinder; 162, first push plate;

[0035] 200, detection table; 210, control box; 220, audible and visual alarm; 230, first material guide assembly; 240, second material guide assembly; 250, transparent plate;

[0036] 231, side baffle; 232, counting sensor; 233, inclined guide plate;

[0037] 300, pushing mechanism; 310, mounting plate; 320, piston assembly; 330, second reciprocating cylinder; 340, second pushing plate; 350, conveying pipeline; 360, hollow exhaust plate;

[0038] 321, piston cylinder; 322, piston rod; 323, annular protrusion; 324, exhaust pipe; 325, one-way valve; 326, rubber piston; 327, air suction pipe;

[0039] 361, air inlet pipe; 362, exhaust hole;

[0040] 400, belt conveyor. DETAILED DESCRIPTION

[0041] The utility model will be further described below in combination with the drawings and examples.

[0042] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the utility model belongs.

[0043] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations are present.

[0044] As shown in Figures 1-12 A turning and milling nut part conveying device, comprising a base 100, a collecting groove 140 and a detection table 200 are arranged on the upper surface of the front end and the rear end of the base 100 respectively, a belt conveyor 400 for conveying nut parts is arranged on one side of the detection table 200, a transparent plate 250 for placing nut parts to be detected is arranged on one side of the surface of the detection table 200, a first CCD vision camera 130 and a second CCD vision camera 150 for detecting the appearance size of the nut parts to be detected are arranged above and below the transparent plate 250 respectively;

[0045] A second material guiding assembly 240 is arranged on one side of the outer wall of the detection table 200 to guide the qualified nut parts to the belt conveyor 400 and count the qualified nut parts. A first material guiding assembly 230 is arranged on one side of the front end wall of the detection table 200 to guide the unqualified nut parts to the collecting groove 140 and count the unqualified nut parts. A pushing assembly 300 is arranged on the other side of the upper surface of the detection table 200 to push the qualified nut parts to the second material guiding assembly 240 and clean the transparent plate 250. A pushing assembly 160 is arranged at the rear end of the detection table 200 to push the unqualified nut parts to the first material guiding assembly 230.

[0046] The first CCD vision camera 130 is installed at the front end of the lower surface of the top plate 120, the top plate 120 is installed at the top end of the support plate 110, the bottom end of the support plate 110 is installed on one side of the upper surface of the rear end of the base 100, the second CCD vision camera 150 is located directly below the first CCD vision camera 130, and the second CCD vision camera 150 is installed on the upper surface of the base 100. The first CCD vision camera 130 detects the detected nut parts from top to bottom, and the second CCD vision camera 150 detects the detected nut parts from bottom to top.

[0047] The pushing assembly 160 is composed of a first reciprocating air cylinder 161 and a first push plate 162. The first reciprocating air cylinder 161 is installed on the rear end face of the support plate 110. The front end of the first reciprocating air cylinder 161 penetrates the end face of the support plate 110 and is connected with the first push plate 162. The first reciprocating air cylinder 161 can drive the first push plate 162 to move linearly in a certain direction reciprocally. When the first push plate 162 moves linearly in a certain direction, the nut parts on the transparent plate 250 can be pushed into the first material guiding assembly 230.

[0048] The first material guiding assembly 230 and the second material guiding assembly 240 are both composed of a side baffle 231, a counting sensor 232, and an inclined material guiding plate 233. The side baffles 231 are installed on both sides of the upper surface of the inclined material guiding plate 233. The counting sensor 232 is arranged on one side of the outer wall of the side baffle 231 and located inside between two adjacent side baffles 231. The counting sensor 232 can count the nut parts sliding on the inclined material guiding plate 233.

[0049] One end of the inclined material guiding plate 233 of the first material guiding assembly 230 is installed at the front end of the detection table 200, and the other end of the inclined material guiding plate 233 of the first material guiding assembly 230 is located above the collecting groove 140. One end of the inclined material guiding plate 233 of the second material guiding assembly 240 is installed on one side of the outer wall of the detection table 200, and the other end of the inclined material guiding plate 233 of the second material guiding assembly 240 is located above one end of the belt conveyor 400.

[0050] The front end of the lower surface side of the detection table 200 is provided with a control box 210, the bottom end of the control box 210 is provided with an audible and visual alarm 220, the front end wall of the control box 210 is provided with a display screen and a control panel, and the control panel is provided with a control button, and the inside of the control box 210 is provided with an A / D conversion module and a single-chip microcomputer.

[0051] The installation plate 310 is provided on the pushing mechanism 300, and the installation plate 310 is installed on the other side of the upper surface of the detection table 200. The outer wall of the installation plate 310 is provided with a piston assembly 320, and the lower side of the outer wall of one side of the installation plate 310 is provided with a second reciprocating air cylinder 330. The other end of the second reciprocating air cylinder 330 penetrates through the outer wall of the installation plate 310 and is connected with a second push plate 340. When the second reciprocating air cylinder 330 is started, the second push plate 340 will move in a reciprocating linear motion in a certain direction. When the second push plate 340 moves linearly in a certain direction, the qualified nut parts can be pushed into the second material guiding assembly 240.

[0052] The piston assembly 320 is provided with a piston cylinder 321, and one end of the piston cylinder 321 penetrates through the outer wall of the installation plate 310. The outer wall of one side of the piston cylinder 321 is provided with an annular protrusion 323, and the annular protrusion 323 is installed on the outer wall of one side of the installation plate 310. The inside of the piston cylinder 321 is provided with a rubber piston 326, and the rubber piston 326 is installed on one end of a piston rod 322. The other end of the piston rod 322 is installed on the outer wall of one side of the second push plate 340.

[0053] The other side of the outer wall of the piston cylinder 321 is provided with an exhaust pipe 324 and an air suction pipe 327, and the exhaust pipe 324 and the air suction pipe 327 are located at the rear end and the front end of the outer wall of the piston cylinder 321 respectively. The exhaust pipe 324 and the air suction pipe 327 are both provided with a one-way valve 325. The one-way valve 325 arranged on the exhaust pipe 324 makes the exhaust pipe 324 only discharge. The one-way valve 325 arranged on the air suction pipe 327 makes the air suction pipe 327 only inhale. The exhaust pipe 324 is connected with an air inlet pipe 361 through a conveying pipeline 350, and the air inlet pipe 361 is arranged at the rear end wall of a hollow exhaust plate 360. An exhaust hole 362 is formed in the lower side of the front end wall of the hollow exhaust plate 360. The hollow exhaust plate 360 is installed on one side of the rear end wall of the detection table 200, and the hollow exhaust plate 360 is located below the first push plate 162.

[0054] When in use, the external power supply is connected, when the robot transfers the nut parts processed to the transparent plate 250, the first CCD vision camera 130 and the second CCD vision camera 150 can respectively visually detect from the top and the bottom of the nut parts, when the first CCD vision camera 130 or the second CCD vision camera 150 visually detects the nut parts unqualified, the single-chip microcomputer arranged in the control box 210 controls the first reciprocating cylinder 161 on the pushing assembly 160 to start and make the first reciprocating cylinder 161 drive the first pushing plate 162 to push the unqualified nut parts into the first material guiding assembly 230, the first material guiding assembly 230 can guide the unqualified nut parts into the collecting groove 140, and the counting sensor 232 on the first material guiding assembly 230 can also count the unqualified nut parts, when the first CCD vision camera 130 or the second CCD vision camera 150 visually detects the nut parts qualified, the single-chip microcomputer arranged in the control box 210 controls the second reciprocating cylinder 330 on the pushing mechanism 300 to start and make the second reciprocating cylinder 330 drive the second pushing plate 340 to push the qualified nut parts into the second material guiding assembly 240, the second material guiding assembly 240 can guide the qualified nut parts into the belt conveyor 400 to be conveyed, and the counting sensor 232 on the second material guiding assembly 240 can also count the qualified nut parts, so that when the nut parts processed by the turning and milling machine are conveyed, the qualified nut parts and the unqualified nut parts can be counted and the unqualified nut parts can be rejected, so that the staff can calculate the qualified rate of a batch of nut parts, so as to adjust the data of the nut parts processed by the numerical control turning and milling machine, ensure the qualified rate of different batches of nut parts, and the second reciprocating cylinder 330 drives the second pushing plate 340 to reciprocate, and the second pushing plate 340 reciprocates to make the piston assembly 320 inhale or exhaust, the piston assembly 320 exhausts to make the gas conveyed into the hollow exhaust plate 360 through the conveying pipeline 350, the gas in the hollow exhaust plate 360 is exhausted from the exhaust hole 362, and the gas exhausted from the exhaust hole 362 blows to the upper surface of the transparent plate 250, so that the impurities remaining on the upper surface of the transparent plate 250 are blown to the outside, so that the situation that the impurities remaining on the upper surface of the transparent plate 250 are too much to affect the appearance and size detection effect of the first CCD vision camera 130 and the second CCD vision camera 150 on the nut parts is avoided.

[0055] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A conveying device for milled and turned nut parts, comprising a base (100), characterized in that: The base (100) has a collection trough (140) at the front end and a detection platform (200) at the rear end of its upper surface. A belt conveyor (400) for conveying nut parts is provided on one side of the detection platform (200). A transparent plate (250) for placing nut parts to be tested is provided on one side of the surface of the detection platform (200). A first CCD vision camera (130) and a second CCD vision camera (150) for detecting the appearance and size of nut parts to be tested are provided above and below the transparent plate (250). A second guiding component (240) is provided on one outer wall of the testing platform (200) for guiding qualified nut parts to the belt conveyor (400) and counting qualified nut parts. A first guiding component (230) is provided on one side of the front wall of the testing platform (200) for guiding unqualified nut parts to the collection tank (140) and counting unqualified nut parts. A pushing mechanism (300) is provided on the other side of the upper surface of the testing platform (200) for pushing qualified nut parts to the second guiding component (240) and for cleaning the transparent plate (250). A pushing component (160) is provided at the rear end of the testing platform (200) for pushing unqualified nut parts onto the first guiding component (230).

2. The conveying device for milled and turned nut parts according to claim 1, characterized in that: The first CCD vision camera (130) is mounted on the front end of the lower surface of the top plate (120), the top plate (120) is mounted on the top of the support plate (110), the bottom end of the support plate (110) is mounted on one side of the rear end of the upper surface of the base (100), the second CCD vision camera (150) is located directly below the first CCD vision camera (130), and the second CCD vision camera (150) is mounted on the upper surface of the base (100).

3. The conveying device for milled and turned nut parts according to claim 1, characterized in that: The feeding assembly (160) is composed of a first reciprocating cylinder (161) and a first push plate (162). The first reciprocating cylinder (161) is installed on the rear end face of the support plate (110). The front end of the first reciprocating cylinder (161) passes through the end face of the support plate (110) and is connected to the first push plate (162).

4. The conveying device for milled and turned nut parts according to claim 1, characterized in that: The first material guiding assembly (230) and the second material guiding assembly (240) are both composed of a side baffle (231), a counting sensor (232) and an inclined material guiding plate (233). The inclined material guiding plate (233) has side baffles (231) installed on both sides of its upper surface. A counting sensor (232) is provided on one outer wall of the side baffle (231), and the counting sensor (232) is located on the inner side between two adjacent side baffles (231).

5. The conveying device for milled and turned nut parts according to claim 4, characterized in that: One end of the inclined guide plate (233) on the first guide assembly (230) is installed on the front wall of the detection table (200), and the other end of the inclined guide plate (233) on the first guide assembly (230) is located above the collection tank (140). One end of the inclined guide plate (233) on the second guide assembly (240) is installed on the outer wall of one side of the detection table (200), and the other end of the inclined guide plate (233) on the second guide assembly (240) is located above one end of the belt conveyor (400).

6. The conveying device for milled and turned nut parts according to claim 1, characterized in that: A control box (210) is installed at the front end of one side of the lower surface of the testing platform (200), and an audible and visual alarm (220) is installed at the bottom of the control box (210).

7. The conveying device for milled and turned nut parts according to claim 1, characterized in that: The feeding mechanism (300) is provided with a mounting plate (310), and the mounting plate (310) is installed on the other side of the upper surface of the testing table (200). A piston assembly (320) is provided on the upper part of the outer wall of the mounting plate (310), and a second reciprocating cylinder (330) is installed on the lower part of the outer wall of one side of the mounting plate (310). The other end of the second reciprocating cylinder (330) passes through the outer wall of the mounting plate (310) and is connected to the second push plate (340).

8. The conveying device for milled and turned nut parts according to claim 7, characterized in that: The piston assembly (320) is provided with a piston cylinder (321), and one end of the piston cylinder (321) penetrates the outer wall of the mounting plate (310). An annular protrusion (323) is provided on one side of the circumferential outer wall of the piston cylinder (321), and the annular protrusion (323) is installed on one side of the outer wall of the mounting plate (310). A rubber piston (326) is provided inside the piston cylinder (321). The rubber piston (326) is installed on one end of the piston rod (322), and the other end of the piston rod (322) is installed on one side of the outer wall of the second push plate (340).

9. The conveying device for milled and turned nut parts according to claim 8, characterized in that: An exhaust pipe (324) and an intake pipe (327) are provided on the other side of the circumferential outer wall of the piston cylinder (321). The exhaust pipe (324) and the intake pipe (327) are located at the rear end and the front end of the circumferential outer wall of the piston cylinder (321), respectively. A one-way valve (325) is provided on both the exhaust pipe (324) and the intake pipe (327). The exhaust pipe (324) is connected to the intake pipe (361) through the delivery pipe (350). The intake pipe (361) is located on the rear end wall of the hollow exhaust plate (360). An exhaust hole (362) is provided below the front end wall of the hollow exhaust plate (360). The hollow exhaust plate (360) is installed on one side of the rear end wall of the testing platform (200). The hollow exhaust plate (360) is located below the first push plate (162).

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