Test fixture for metal detector and method of testing a metal detector

Abstract

The application provides a test fixture of a metal detector and a test method of the metal detector, wherein the test fixture of the metal detector comprises: a first clamping arm provided with a first clamping part; a second clamping arm, a first end of the second clamping arm being hingedly connected to a first end of the first clamping arm, and the second clamping arm being provided with a second clamping part; and a first scale arranged at the first end of the first clamping arm; wherein the first clamping arm and the second clamping arm have a closed position and an open position, when the first clamping arm and the second clamping arm are in the closed position, the first clamping part and the second clamping part are butted, and a spherical accommodating space is formed between the first clamping part and the second clamping part. The technical scheme of the application effectively solves the problem of poor accuracy of the test of the metal detector in the related art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal detector, in particular to a test fixture of metal detector and a test method of metal detector. BACKGROUND

[0002] Gravity fall type metal detector is specially designed for detecting free falling powder and particle products in non-pressurized application, which has been widely used in pharmaceutical, food and other industries in recent years. As an important means of metal foreign matter interception, metal detector is generally the key control point in the production process. The running state of the equipment must be effectively verified before it can be used normally.

[0003] In the related art, the gravity fall type metal detector generally adopts the design method of one-side opening of the side wall of the feeding pipe for ball test, that is, a metal-containing standardized test ball with uniform size is thrown into the metal detector chamber from the side wall opening, and the device can automatically identify and immediately remove it. However, such side-view method cannot accurately limit the position of the test ball, which may result in poor test accuracy. SUMMARY

[0004] The main purpose of the present application is to provide a test fixture of metal detector and a test method of metal detector to solve the problem of poor test accuracy of metal detector in the related art.

[0005] In order to achieve the above purpose, according to one aspect of the present application, a test fixture of metal detector is provided, comprising: a first clamping arm having a first clamping part; a second clamping arm, the first end of the second clamping arm being hingedly connected to the first end of the first clamping arm, the second clamping arm having a second clamping part; and a first scale provided at the first end of the first clamping arm; wherein the first clamping arm and the second clamping arm have a closed position and an open position, when the first clamping arm and the second clamping arm are in the closed position, the first clamping part and the second clamping part are in abutment, and a spherical accommodation space is formed between the first clamping part and the second clamping part.

[0006] Further, the first clamping part is located at the first end of the first clamping arm and connected with the first scale, the second end of the first clamping arm is a first holding end, the second clamping part is located at the first end of the second clamping arm, and the second end of the second clamping arm is a second holding end.

[0007] Further, the test fixture of metal detector further comprises a first protrusion provided at one end of the first clamping part away from the first clamping arm and a second protrusion provided at one end of the second clamping part away from the first end of the second clamping arm, the first protrusion is provided with a first connecting hole, the second protrusion is provided with a second connecting hole, the first protrusion and the second protrusion are arranged in superposition, and the test fixture of metal detector further comprises a hinge shaft inserted into the first connecting hole and the second connecting hole.

[0008] Further, the first scale comprises a first scale part and a first sleeve part, the first sleeve part movably sleeving the first scale part, and a first locking member being arranged between the first scale part and the first sleeve part.

[0009] Further, the first clamping part comprises a first half spherical shell, and the second clamping part comprises a second half spherical shell.

[0010] Further, the first clamping arm comprises a second scale part, a second sleeve part and a second locking member, the first clamping part being connected with the second scale part, the second sleeve part movably sleeving the second scale part, and the second locking member being connected between the second scale part and the second sleeve part.

[0011] Further, the second clamping arm comprises a third scale part, a third sleeve part and a third locking member, the third scale part being connected with the second clamping part, the third sleeve part movably sleeving the third scale part, and the third locking member being connected between the third scale part and the third sleeve part.

[0012] Further, the second sleeve part is provided with a first finger ring at an end away from the first clamping part, and the third sleeve part is provided with a second finger ring at an end away from the second clamping part.

[0013] According to an aspect of the present application, there is provided a testing method of a metal detector, which uses the testing fixture of the metal detector to perform testing, and the testing method of the metal detector comprises the following steps: placing a test ball in the first clamping part, and pushing the second clamping arm towards the first clamping arm to make the second clamping part abut against the first clamping part; adjusting the scale of the first scale, and vertically extending the testing fixture into a test hole of a feeding pipe of the metal detector along an axis of the feeding pipe, and making an end of the first scale abut against a side wall of the feeding pipe to obtain a first test point; withdrawing the testing fixture from the test hole, adjusting the scale of the first scale to vertically extend the testing fixture into the test hole of the feeding pipe, and making the end of the first scale abut against the side wall of the feeding pipe to obtain a second test point; withdrawing the testing fixture from the test hole, adjusting the scale of the first scale to vertically extend the testing fixture into the test hole of the feeding pipe, and making the end of the first scale abut against the side wall of the feeding pipe to obtain a third test point; withdrawing the testing fixture from the test hole, adjusting the first scale, the first clamping arm and the second clamping arm, and extending the testing fixture into the test hole of the feeding pipe along a first inclined direction to make the end of the first scale abut against a side wall of the metal detector to obtain a fourth test point; swinging the testing fixture to arrange the testing fixture along a second inclined direction, and making the end of the first scale abut against the side wall of the feeding pipe to obtain a fifth test point.

[0014] Further, before placing the test ball in the first clamping part, further comprising: obtaining positions of the first test point, the second test point, the third test point, the fourth test point and the fifth test point according to a pipe diameter of the feeding pipe of the metal detector; wherein the minimum distance a between the first test point and the inner wall of the feeding pipe, the minimum distance b between the third test point and the inner wall of the feeding pipe, the minimum distance c between the fourth test point and the inner wall of the feeding pipe and the minimum distance d between the fifth test point and the inner wall of the feeding pipe and the pipe diameter e of the feeding pipe satisfy: 1 / 3e≤a=b=c=d≤2 / 3e.

[0015] By the technical scheme of the present application, the first clamping arm has the first clamping part, and the second clamping arm has the second clamping part. The first clamping part and the second clamping part can be butted. The first scale is arranged at the first end of the first clamping arm. The first clamping arm and the second clamping arm have a closed position and an open position. When the first clamping arm and the second clamping arm are in the closed position, the first clamping part and the second clamping part are butted, thereby forming a spherical accommodation space between the first clamping part and the second clamping part. The inside of the spherical accommodation space is used to accommodate the test ball. By adjusting the length of the first scale, the test clamp is extended into the inside of the feeding pipe of the metal detector, and the end of the first scale away from the first clamping arm is abutted against the side wall of the feeding pipe, so that the position of the test ball in the feeding pipe is accurate, and multiple tests are performed, a plurality of different test point positions are obtained, and the accuracy of the test of the metal detector is effectively improved. Therefore, the technical scheme of the present application effectively solves the problem of poor test accuracy of the metal detector in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, explain the application. The detailed description of the application and its examples serve to explain the application without imposing undue limitation on the application. In the drawings:

[0017] Figure 1 Fig. 1 shows a perspective structural schematic view of an embodiment of a test clamp of a metal detector according to the present application;

[0018] Figure 2 Fig. 2 shows a perspective structural schematic view of the test clamp of the metal detector according to the present application; Figure 1 Fig. 3 shows a partial enlarged view of A of the test clamp of the metal detector according to the present application;

[0019] Figure 3 Fig. 4 shows a sectional view of the first convex part and the second convex part of the test clamp of the metal detector according to the present application; Figure 1 Fig. 5 shows a sectional view of the first convex part and the second convex part of the test clamp of the metal detector according to the present application;

[0020] Figure 4 Fig. 6 shows a top view of the test clamp of the metal detector according to the present application; Figure 1

[0021] ​Figure 5 a bottom view of the test fixture of the metal detector of Figure 1

[0022] Figure 6 a side view of the test fixture of the metal detector of Figure 1

[0023] Figure 7 a structural schematic view of the metal detector of Figure 1

[0024] Figure 8 a schematic view of the test fixture of the metal detector of Figure 1

[0025] Figure 9 a schematic view of the test fixture of the metal detector of Figure 1

[0026] Figure 10 a flow schematic view of an embodiment of the test method of the metal detector according to the present application.

[0027] wherein the above figures include the following reference signs:

[0028] 1, metal detector; 2, feeding pipe; 10, first clamping arm; 11, first clamping part; 111, first half spherical shell; 112, first finger ring; 12, second clamping part; 13, second sleeve part; 14, second locking piece; 20, second clamping arm; 21, second clamping part; 211, second half spherical shell; 212, second finger ring; 22, third clamping part; 23, third sleeve part; 24, third locking piece; 30, first scale; 31, first clamping part; 32, first sleeve part; 33, first locking piece; 40, spherical accommodating space; 51, first protrusion; 511, first connecting hole; 52, second protrusion; 521, second connecting hole; 53, hinged shaft; 61, first test point; 62, second test point; 63, third test point; 64, fourth test point; 65, fifth test point. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] ​​​​​It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0031] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless specifically so stated. It is to be understood that the drawings shown in the attached figures are not drawn to scale and that elements of similar structure or function are represented by like numerals throughout the attached figures. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail but can be assumed known by those of ordinary skill in the art. In the examples shown and discussed herein, any specific values are to be interpreted as merely exemplary and not limiting. Thus, other examples of the example embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings and that one or more specific embodiments can not be further discussed in subsequent views to avoid obscuring the discussion of the preceding views.

[0032] The gravity falling metal detector adopts the principle of balanced coil, but due to the difference in the number of winding and transmitting coil and the placement of the receiving coil, the sensitivity is not necessarily the strongest near the wall of the metal detector; the friction between the material and the pipeline can generate static electricity, causing interference / electric field change, if the metal is at the static electricity change place, since the metal detector has shielded the influence of static electricity, so the metal foreign matter in this part will be hidden, and the five-point test method can more effectively verify the electromagnetic receiver, signal processor and potential test blind area.

[0033] At present, various types of gravity falling metal detectors generally adopt the design method of single-side opening of the feeding pipe wall for ball test, but this design method cannot realize precise five-point ball test, and can only test a single point near the pipe wall each time. In order to solve the above technical problems, the present application provides a gravity falling metal detector with a five-point test method Figure 1 and Figures 4 to 7As shown, in the embodiment, the test fixture of the metal detector comprises a first clamping arm 10, a second clamping arm 20 and a first scale 30. The first clamping arm 10 has a first clamping part 11. The second clamping arm 20 is hingedly connected to the first end of the first clamping arm 10, and the second clamping arm 20 has a second clamping part 21. The first scale 30 is arranged at the first end of the first clamping arm 10. The first clamping arm 10 and the second clamping arm 20 have a closed position and an open position. When the first clamping arm 10 and the second clamping arm 20 are in the closed position, the first clamping part 11 and the second clamping part 21 are butted, and a spherical accommodating space 40 is formed between the first clamping part 11 and the second clamping part 21.

[0034] By applying the technical scheme of the embodiment, the first clamping arm 10 has the first clamping part 11, and the second clamping arm 20 has the second clamping part 21. The first clamping part 11 and the second clamping part 21 can be butted. The first scale 30 is arranged at the first end of the first clamping arm 10. The first clamping arm 10 and the second clamping arm 20 have a closed position and an open position. When the first clamping arm 10 and the second clamping arm 20 are in the closed position, the first clamping part 11 and the second clamping part 21 are butted, and a spherical accommodating space 40 is formed between the first clamping part 11 and the second clamping part 21. The inside of the spherical accommodating space 40 is used to accommodate a test ball. By adjusting the length of the first scale 30, the test fixture is inserted into the inside of the feeding pipe 2 of the metal detector 1, and the end of the first scale 30 away from the first clamping arm 10 abuts against the side wall of the feeding pipe 2. In this way, the position of the test ball in the feeding pipe can be accurately determined, and multiple tests can be performed to obtain multiple different test points. Through the multiple test points, the accuracy of the test of the metal detector 1 can be effectively improved. Therefore, the technical scheme of the embodiment effectively solves the problem of poor test accuracy of the metal detector in the related art.

[0035] The technical scheme of the embodiment can accurately position and feed the standard test sample ball in the metal detector chamber, has a simple structure and is convenient to clean and disinfect, and can be widely applied to the rejection effectiveness verification of various types of gravity falling type metal detectors.

[0036] In an embodiment not shown in the figure, a magnetic attraction structure is arranged between the first clamping arm and the second clamping arm, so that the first clamping arm and the second clamping arm can be attracted together. Under the action of the magnetic attraction structure, the first clamping part and the second clamping part can be butted together, so that the test ball can also be fixed.

[0037] As Figure 1 and Figures 4 to 7As shown, in the embodiment, the first clamping part 11 is located at the first end of the first clamping arm 10 and connected with the first scale 30, the second end of the first clamping arm 10 is the first holding end, the second clamping part 21 is located at the first end of the second clamping arm 20, and the second end of the second clamping arm 20 is the second holding end. The first holding end and the second holding end facilitate the operation of the operator, and at the same time, the first clamping part 11 is located at the first end of the first clamping arm 10, and the second clamping part 21 is located at the first end of the second clamping arm 20. Specifically, the first clamping part 11 and the second clamping part 21 are hinged together, which makes the clamping of the first clamping part 11 and the second clamping part 21 more stable. At the same time, when the first clamping part 11 and the second clamping part 21 are opened, the opening gradually increases, which can make it easier to pick up the test ball and prevent it from falling off.

[0038] As shown in Figures 1 to 5 , in the embodiment, the test fixture of the metal detector further comprises a first protrusion 51 provided at the end of the first clamping part 11 away from the first clamping arm 10 and a second protrusion 52 provided at the end of the second clamping part 21 away from the second clamping arm 20, the first protrusion 51 is provided with a first connecting hole 511, the second protrusion 52 is provided with a second connecting hole 521, the first protrusion 51 and the second protrusion 52 are arranged in a stacked manner, and the test fixture of the metal detector further comprises a hinge shaft 53 inserted into the first connecting hole 511 and the second connecting hole 521. The arrangement of the first protrusion 51 and the second protrusion 52 enables the first clamping part 11 and the second clamping part 21 to be hinged together, and at the same time, the first protrusion 51 and the second protrusion 52 can protrude from the first clamping part 11 and the second clamping part 21 and protrude in a direction away from the first clamping arm 10, so that the hinge shaft 53 can realize hinging. And the first protrusion 51 and the second protrusion 52 are protruded in a direction away from the first clamping arm 10, which makes the position of the first scale 30 stable and enables the test ball to be disassembled without a large space.

[0039] As shown in Figure 1 , Figure 4 and Figure 5 , in the embodiment, the first scale 30 comprises a first scale part 31 and a first sleeve part 32, the first sleeve part 32 is movably sleeved on the first scale part 31, and a first locking piece 33 is arranged between the first scale part 31 and the first sleeve part 32. The first locking piece 33 can lock the position of the first scale part 31 and the first sleeve part 32, which makes the test more convenient. Specifically, in the embodiment, the first locking piece 33 is a first bolt.

[0040] In an embodiment not shown in the drawings, a convex tooth and a concave groove are arranged between the first scale and the first sleeve, the convex tooth is arranged on the first scale, a mounting hole is arranged on the side wall of the first scale, a spring is connected in the mounting hole, one end of the spring is spring-connected with the convex tooth, so that the convex tooth can move in the concave groove, and the convex tooth and the concave groove are in abutting fit, so that the locking between the first scale and the first sleeve can also be achieved.

[0041] As Figure 1 , Figure 4 and Figure 5 indicated, in the present embodiment, the first clamping part 11 comprises a first half spherical shell 111, and the second clamping part 21 comprises a second half spherical shell 211. The first half spherical shell 111 and the second half spherical shell 211 can realize clamping of the test ball, and the inside of the first half spherical shell 111 and the second half spherical shell 211 forms a spherical accommodating space 40, so that the fixation of the test ball is more stable.

[0042] In an embodiment not shown in the drawings, the first clamping part comprises a first limiting frame, and the second clamping part comprises a second limiting frame, both of which are half spherical.

[0043] As Figures 1 to 5 indicated, in the present embodiment, the first clamping arm 10 comprises a second scale 12, a second sleeve 13 and a second locking piece 14, the first clamping part 11 is connected with the second scale 12, the second sleeve 13 is movably sleeved on the second scale 12, and the second locking piece 14 is connected between the second scale 12 and the second sleeve 13. The cooperation of the second scale 12 and the second sleeve 13 can make the adjustment length of the test fixture larger, and thus the adjustment range of the test fixture is larger, and thus the test fixture can test points at different positions. At the same time, the second locking piece 14 can lock the position between the second scale 12 and the second sleeve 13.

[0044] In order to avoid the lengths of the first clamping arm 10 and the second clamping arm 20 being different when the test fixture is adjusted in length, and thus the test fixture can be more stable when testing. Specifically, as Figures 1 to 5 indicated, in the present embodiment, the second clamping arm 20 comprises a third scale 22, a third sleeve 23 and a third locking piece 24, the third scale 22 is connected with the second clamping part 21, the third sleeve 23 is movably sleeved on the third scale 22, and the third locking piece 24 is connected between the third scale 22 and the third sleeve 23. The above arrangement can make the lengths of the first clamping arm 10 and the second clamping arm 20 the same, and thus the operator can more conveniently operate the test fixture when testing.

[0045] As Figures 1 to 5As shown, in the embodiment, the first sleeve part 13 is provided with a first ring 112 at one end away from the first clamping part 11, and the third sleeve part 23 is provided with a second ring 212 at one end away from the second clamping part 21. The first ring 112 and the second ring 212 can be more convenient for the operator to take the test fixture.

[0046] As shown, the use process of the test fixture of the embodiment is as follows: Figures 1 to 9

[0047] In use, first, adjust the first sleeve part 32 to the first ruler part 31 to a reasonable position, and lock with the first locking part 33; then adjust the second ruler part and the third ruler part to a reasonable position, and lock the second ruler part and the third ruler part with the second locking part and the third locking part; insert the finger into the first ring 112, and slightly force the second ring 212 outward, so that the first clamping part 11 and the second clamping part 21 are opened to a certain space; put the test ball into the first clamping part 11 and the second clamping part 21, insert the finger into the first ring 112 and the second ring 212, and slightly force the second ring 212 inward to clamp the test ball; keep in the state of clamping the ball, horizontally extend the test fixture into the side wall opening of the feeding pipe 2 of the metal detector 1, and keep the end of the first sleeve part 32 against the inner side of the side wall of the feeding pipe 2, and keep the edges of the first ring 112 and the second ring 212 clamped outside the side wall opening of the feeding pipe 2, and slightly force the finger outward to release the test ball, and complete one test.

[0048] The test fixture of the embodiment can be made of 304 stainless steel, PP (polypropylene), or a combination of 304 stainless steel and PP (polypropylene).

[0049] Specifically, the first embodiment is as follows:

[0050] The overall material is 304 stainless steel, the first sleeve part 32 is 22 mm long and 8 mm wide, the three main ruler parts are 12 mm long and 6 mm wide, the inner circle radius of the spherical accommodation space 40 is 11.5 mm, the second clamping arm 20 is 42 mm long and 6 mm wide, and the first clamping arm 10 is 52 mm long and 8 mm wide.

[0051] The second embodiment is as follows:

[0052] The overall material is 304 stainless steel, the first sleeve part 32 is 35 mm long and 10 mm wide, the three main ruler parts are 25 mm long and 8 mm wide, the inner circle radius of the spherical accommodation space 40 is 11.5 mm, the second clamping arm 20 is 48 mm long and 8 mm wide, and the first clamping arm 10 is 58 mm long and 10 mm wide.

[0053] The third embodiment is as follows:

[0054] ​The overall material is selected from 304 stainless steel, the first sleeve part 32 is 125 mm long and 10 mm wide, the 3 main sizes are 115 mm long and 8 mm wide, the spherical receiving space 40 has an inner circle radius of 11.5 mm, the second clamping arm 20 is 168 mm long and 8 mm wide, and the first clamping arm 10 is 178 mm long and 10 mm wide.

[0055] Embodiment Four:

[0056] The overall material is selected from PP (polypropylene), the first sleeve part 32 is 35 mm long and 10 mm wide, the 3 main sizes are 25 mm long and 8 mm wide, the spherical receiving space 40 has an inner circle radius of 11.5 mm, the second clamping arm 20 is 48 mm long and 8 mm wide, and the first clamping arm 10 is 58 mm long and 10 mm wide.

[0057] The technical scheme of the embodiment can realize accurate positioning and feeding of a standardized test ball in a metal detector chamber through a test clamp, more effectively verify the electromagnetic receiver, signal processor and potential test blind area of the gravity drop type metal detector, and has a simple overall structure, can be quickly disassembled and inspected, is convenient for cleaning and disinfection, is suitable for application in advanced health areas of the pharmaceutical and food industries, and can be applied to test of all gravity drop type metal detectors through sliding and size adjustment of the first scale 30, the first clamping arm 10 and the second clamping arm 20.

[0058] As shown in Figures 8 to 10 , in the embodiment, the metal detector test method uses the above-mentioned metal detector test clamp for testing, and the metal detector test method comprises:

[0059] The test ball is placed in the first clamping part 11, and the second clamping arm 20 is pushed towards the first clamping arm 10 to make the second clamping part 21 and the first clamping part 11 abut. In this way, the test ball can be clamped between the first clamping part 11 and the second clamping part 21, which prepares for the test and provides convenience for subsequent testing.

[0060] The scale of the first scale 30 is adjusted, the test clamp is inserted into the test hole of the feeding pipe 2 of the metal detector 1 in the vertical direction of the axis of the feeding pipe 2, and the end of the first scale 30 abuts against the side wall of the feeding pipe 2, so as to obtain a first test point 61; the length of the first scale 30 is shortened, the end of the first sleeve part 32 abuts against the inner wall of the feeding pipe 2, so that the position of the test ball is obtained as a test point, i.e. the first test point 61.

[0061] The test fixture is pulled out of the test hole, the scale of the first scale 30 is adjusted, the test fixture is vertically extended into the test hole of the feeding pipe 2, and the end of the first scale 30 is abutted with the side wall of the feeding pipe 2 to obtain the second test point 62. The length of the first scale 30 is shortened, the first scale part 31 and the first sleeve part 32 are locked by the first locking part 33, the end of the first sleeve part 32 is abutted with the inner wall of the feeding pipe 2, and then the second test point 62 is obtained. The second test point 62 is the center point of the feeding pipe 2.

[0062] The test fixture is pulled out of the test hole, the scale of the first scale 30 is adjusted, the test fixture is vertically extended into the test hole of the feeding pipe 2, and the end of the first scale 30 is abutted with the side wall of the feeding pipe 2 to obtain the second test point 62. The length of the first scale 30 is shortened, the first scale part 31 and the first sleeve part 32 are locked by the first locking part 33, the end of the first sleeve part 32 is abutted with the inner wall of the feeding pipe 2, and then the second test point 62 is obtained. The second test point 62 is the center point of the feeding pipe 2.

[0063] In order to further improve the accuracy of the test, the test fixture is pulled out of the test hole, the first scale 30, the first clamping arm 10 and the second clamping arm 20 are adjusted, the test fixture is extended into the test hole of the feeding pipe 2 along the first inclined direction to abut the end of the first scale 30 with the side wall of the metal detector 1 to obtain the fourth test point 64, and the test fixture is swung to arrange the test fixture along the second inclined direction and abut the end of the first scale 30 with the side wall of the feeding pipe 2 to obtain the fifth test point 65.

[0064] The fourth test point 64 and the fifth test point 65 are symmetrically arranged on both sides of the line connecting the first test point 61 and the second test point 62. The fifth test point 65 and the fourth test point 64 are on the same straight line with the second test point 62, and the first test point 61, the second test point 62, the third test point 63, the fourth test point 64 and the fifth test point 65 are all located in the same horizontal plane.

[0065] Before the test ball is placed in the first clamping part 11, the positions of the first test point 61, the second test point 62, the third test point 63, the fourth test point 64 and the fifth test point 65 are obtained according to the pipe diameter of the feeding pipe 2 of the metal detector 1; wherein the minimum distance a between the first test point 61 and the inner wall of the feeding pipe 2, the minimum distance b between the third test point 63 and the inner wall of the feeding pipe 2, the minimum distance c between the fourth test point 64 and the inner wall of the feeding pipe 2 and the minimum distance d between the fifth test point 65 and the inner wall of the feeding pipe 2 and the pipe diameter e of the feeding pipe 2 satisfy: 1 / 3e≤a=b=c=d≤2 / 3e. When the test is performed, the positions of the first test point 61, the second test point 62, the third test point 63, the fourth test point 64 and the fifth test point 65 need to be calculated according to the pipe diameter of the feeding pipe 2. After the positions of the first test point 61, the second test point 62, the third test point 63, the fourth test point 64 and the fifth test point 65 are calculated, the lengths of the first ruler part 31, the second ruler part 12 and the third ruler part 22 are adjusted according to the sizes, so that the test fixture is stretched into the feeding pipe 2, and the first test point 61, the second test point 62, the third test point 63, the fourth test point 64 and the fifth test point 65 can be obtained. And 1 / 3e≤a=b=c=d≤2 / 3e can make the test more accurate. Specifically, a=b=c=d=1 / 2e.

[0066] The above test scheme needs to make the first sleeve part abut against the inner wall of the feeding pipe when the test is performed, so that the positions of the first test point 61, the second test point 62, the third test point 63, the fourth test point 64 and the fifth test point 65 are accurate.

[0067] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each part itself.

[0068] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof shall relate to the application as oriented in the drawing. The terms "on", "above", "under", "below" and derivatives thereof shall relate to the application as oriented in the drawing, with the test of "above" and "under" being determined based on the position of the device in the drawing. Where the word "comprise" or variations such as "comprises" or "comprising" are used in the following description, it specifically expressly stated that other elements can also be present. Like reference numerals refer to like elements throughout. The term "coupled" as used herein is intended to mean either a direct connection between two elements or an indirect connection through one or more intervening elements. The term "associated with" as used herein is intended to mean either a direct connection between two elements or an indirect connection through one or more intervening elements.

[0069] In addition, it should be pointed out that the use of "first", "second" and the like words to qualify parts, is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0070] The preferred embodiments of the present application have been described above with the purpose of enabling not only the best modes of practicing the application known to the inventors at this time, but also of enabling others skilled in the art to utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore the above description should not be construed as limiting the scope of the present application, but as merely providing illustrations of the presently preferred embodiments thereof. Thus, the scope of the present application should be determined by the appended claims and their legal equivalents, rather than by the examples given.

Claims

1. A test fixture for a metal detector, characterized by, The utility model relates to a metal detector's test fixture, including: First clamping arm (10) have first clamping part (11); Second clamping arm (20), first end of second clamping arm (20) is hinged with first end of first clamping arm (10), second clamping arm (20) have second clamping part (21); First scale (30) are arranged in first end of first clamping arm (10); Wherein, first clamping arm (10) and second clamping arm (20) have closed position and open position, when first clamping arm (10) and second clamping arm (20) are in closed position, first clamping part (11) and second clamping part (21) butt joint, and the spherical accommodation space (40) between first clamping part (11) and second clamping part (21) is formed: First scale (30) includes first ruler part (31) and first sleeve part (32), and first sleeve part (32) is movably sleeved on first ruler part (31), and first locking piece (33) is arranged between first ruler part (31) and first sleeve part (32); First locking piece (33) is first bolt.

2. The test fixture for metal detectors of claim 1, wherein, First clamping part (11) is located in first end of first clamping arm (10) and is connected with first scale (30), and second end of first clamping arm (10) is first holding end, and second clamping part (21) is located in first end of second clamping arm (20), and second end of second clamping arm (20) is second holding end.

3. The test fixture for metal detectors of claim 1, wherein, The metal detector's test fixture further includes first convex part (51) arranged at the end of first clamping part (11) away from first clamping arm (10) and second convex part (52) arranged at the first end of second clamping part (21) away from second clamping arm (20), first connecting hole (511) is arranged on first convex part (51), second connecting hole (521) is arranged on second convex part (52), first convex part (51) and second convex part (52) are arranged in superposition, and the metal detector's test fixture further includes hinged shaft (53), and the hinged shaft (53) is inserted into first connecting hole (511) and second connecting hole (521).

4. The test fixture for metal detectors of claim 1, wherein, First clamping part (11) includes first half spherical shell (111), and second clamping part (21) includes second half spherical shell (211).

5. The test fixture for metal detectors of claim 1, wherein, First clamping arm (10) includes second ruler part (12), second sleeve part (13) and second locking piece (14), first clamping part (11) is connected with second ruler part (12), second sleeve part (13) is movably sleeved on second ruler part (12), and second locking piece (14) is connected between second ruler part (12) and second sleeve part (13).

6. The test fixture for metal detectors of claim 5, wherein, The second clamping arm (20) comprises a third scale portion (22), a third sleeve portion (23) and a third locking member (24), the third scale portion (22) is connected with the second clamping portion (21), the third sleeve portion (23) is movably sleeved on the third scale portion (22), and the third locking member (24) is connected between the third scale portion (22) and the third sleeve portion (23).

7. A test fixture for metal detectors according to claim 6, wherein, The second sleeve portion (13) is provided with a first finger ring (112) at one end away from the first clamping portion (11), and the third sleeve portion (23) is provided with a second finger ring (212) at one end away from the second clamping portion (21).

8. A method of testing a metal detector, using the test jig of any one of claims 1 to 7, characterized in that, The test method of the metal detector comprises: placing a test ball in the first clamping portion (11) and pushing the second clamping arm (20) towards the first clamping arm (10) to make the second clamping portion (21) and the first clamping portion (11) abut; adjusting the scale of the first scale (30), extending the test fixture into the test hole of the feeding pipe (2) of the metal detector (1) in the vertical direction of the axis of the feeding pipe (2), and making the end of the first scale (30) abut against the side wall of the feeding pipe (2) to obtain a first test point (61); pulling the test fixture out of the test hole, adjusting the scale of the first scale (30) to vertically extend the test fixture into the test hole of the feeding pipe (2), and making the end of the first scale (30) abut against the side wall of the feeding pipe (2) to obtain a second test point (62); pulling the test fixture out of the test hole, adjusting the scale of the first scale (30) to vertically extend the test fixture into the test hole of the feeding pipe (2), and making the end of the first scale (30) abut against the side wall of the feeding pipe (2) to obtain a third test point (63); pulling the test fixture out of the test hole, adjusting the first scale (30), the first clamping arm (10) and the second clamping arm (20), extending the test fixture into the test hole of the feeding pipe (2) in a first inclined direction to make the end of the first scale (30) abut against the side wall of the metal detector (1) to obtain a fourth test point (64), and swinging the test fixture to arrange the test fixture in a second inclined direction and make the end of the first scale (30) abut against the side wall of the feeding pipe (2) to obtain a fifth test point (65).

9. The method of testing a metal detector according to claim 8, wherein, Before placing the test ball in the first clamping portion (11), it further comprises: obtaining the positions of the first test point (61), the second test point (62), the third test point (63), the fourth test point (64) and the fifth test point (65) according to the pipe diameter of the feeding pipe (2) of the metal detector (1); Wherein, the minimum distance a between the first test point (61) and the inner wall of the feeding pipe (2), the minimum distance b between the third test point (63) and the inner wall of the feeding pipe (2), the minimum distance c between the fourth test point (64) and the inner wall of the feeding pipe (2), the minimum distance d between the fifth test point (65) and the inner wall of the feeding pipe (2) and the pipe diameter e of the feeding pipe (2) satisfy: 1 / 3e≤a=b=c=d≤2 / 3e.

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