LU601329B1 - Positive and negative indicating device for measuring polarity - Google Patents

Abstract

Disclosed is a positive and negative indicating device for measuring polarity, including a detection mechanism, a driving mechanism and a switching mechanism. The detection mechanism includes an upper housing, a lower housing, a test portion, a guide portion and a follower portion; the driving mechanism includes a first chute, a second chute and a penetration hole, a moving portion, a resetting portion and a driving portion, and a pulling portion; and the switching mechanism includes a switching portion and a restricting portion. By arranging the detection mechanism, the driving mechanism and the switching mechanism, the positive and negative electrodes of different objects can be detected, and the observation is more intuitive. (FIG. 1)

Description

DESCRIPTION

POSITIVE AND NEGATIVE INDICATING DEVICE FOR MEASURING POLARITY

TECHNICAL FIELD

The present invention relates to the technical field of polarity measuring devices, and in particular to a positive and negative indicating device for measuring polarity.

BACKGROUND

Generator, exciter, transformer and other equipment insulation test polarity measurement, need voltmeter or multimeter with the measurement use, the test meter is bulky and the indicator observation is not obvious, affecting the work efficiency, for example, in the experimental measurement of PT, PT is in the dark environment, each time to do the experiment, observe the meter pointer swing is not obvious, at the same time, The existing detection equipment has a single detection method, which can be divided into contact, clamping and extrusion. When measuring by contact method, it is impossible to record the observation at the same time. When measuring by clamping method, it is impossible to detect the object that cannot be clipped, which makes the staff need to use different devices when detecting the positive and negative electrodes of different objects.

SUMMARY

An objective of this section is to summarize some solutions of examples of the present invention and to briefly introduce some preferred examples. Some simplifications or omissions may be made in this section and in the abstract of the specification and the name of the invention in order to avoid obscuring the purpose of this section, the abstract of the specification and the name of the invention, and such simplifications or omissions may not be used to limit the scope of the present invention.

The present invention has been proposed in view of the problem that the conventional detection apparatus has a single detection method, and workers need to use different devices when detecting the positive and negative electrodes of different objects.

In order to solve the above technical problems, the present invention provides the following technical solutions. A positive and negative indicating device for measuring polarity includes a detection mechanism including an upper housing and a lower housing, a test portion arranged inside the lower housing, a guide portion arranged on the lower housing, and a follower portion arranged on the guide portion; a driving mechanism including a first slide groove arranged on the lower housing, a second slide groove and a through hole arranged on the upper housing, a moving portion arranged inside the first slide groove, a resetting portion and a driving portion arranged on the moving portion, and a pulling portion arranged on the resetting portion; and a switching mechanism including a switching portion arranged on the upper housing and a restricting portion arranged on the driving portion.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the test portion includes a resistor arranged on the lower housing, a first lamp body and a second lamp body arranged on the resistor, a first diode arranged on the resistor, a test pen and a second diode arranged on the first diode, and an elbow arranged on the test pen.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the guide portion includes a first guide groove, a chute, and a second guide groove arranged on the lower housing.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the follower portion includes a sleeve arranged on the test pen, and a fixing rod, a first limit ring, and a second limit ring arranged on the sleeve.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the moving portion includes a moving block arranged inside the first chute, and a groove arranged in the moving block.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the return portion includes a slot arranged on the moving block, a first spring arranged inside the slot, and an insertion lever arranged on the first spring.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the driving portion includes a fixing plate arranged on the plug, a first vertical rod and a second vertical rod arranged on the fixing plate, and a concave block arranged on the first vertical rod.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the pulling portion includes a storage groove arranged on the moving block, and a second spring arranged inside the storage groove.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the switching portion includes a wide groove and a thin groove arranged on the upper housing.

In a preferred solution of the positive and negative indicating device for measuring polarity of the present invention, the restricting portion includes a short rod arranged on the first vertical rod, a first tooth groove arranged on the upper housing, and a second tooth groove arranged on the fixing plate.

The invention has the beneficial effects that the positive and negative poles of different objects can be tested through the setting of the detection mechanism, the positive and negative poles of the objects can be judged according to whether the first lamp body and the second lamp body are lit, the setting of the driving mechanism is convenient for workers to store the test pen when the test pen is not used, and it is convenient for workers to take it out when the test pen needs to be used, and the setting of the switching mechanism can make workers detect objects of different styles through the test pen.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the technical solution of the embodiment of the present invention, the drawings that need to be used in the description of the embodiment will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without making creative labor for those skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a positive and negative indicating device for measuring polarity according to the present invention.

FIG. 2 is a schematic diagram of that front structure of the positive and negative indicating device for measuring polarity according to the present invention.

FIG. 3 is a schematic diagram of a cross-sectional structure of a first chute of a positive and negative measuring polarity indicating device according to the present invention.

FIG. 4 is an enlarged schematic diagram of the positive and negative measuring polarity indicating device according to the present invention at point A in FIG. 3.

FIG. 5 is a schematic plan view of the lower housing of the positive and negative measuring polarity indicating device according to the present invention.

FIG. 6 is a schematic diagram of a drive mechanism of a positive and negative measuring polarity indicating device according to the present invention.

FIG. 7 is an enlarged schematic diagram of a drive mechanism of a positive and negative measuring polarity indicating device according to the present invention.

FIG. 8 is a schematic structure diagram of a follower portion of a positive and negative indicating device for measuring polarity according to the present invention.

FIG. 9 is a schematic diagram of that positive and negative polarity indicating device for measure the positive and negative polarity according to the present invention.

FIG. 10 is a schematic diagram showing that reverse current of a positive and negative polarity indicator measure according to the present invention.

DETAILED DESCRIPTION

In order to make the above objects, features and advantages of the present invention more obvious and easily understood, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Numerous specific details are set forth in the following description in order to facilitate a full understanding of the invention, but the invention may be practiced in other ways than those described herein, and those skilled in the art can make similar generalizations without departing from the contents of the invention, and thus the invention is not limited by the specific embodiments disclosed below.

The term "one embodiment" or "embodiment" as used herein refers to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they embodiments that are individually or selectively mutually exclusive of other embodiments.

The present invention will be described in detail with reference to schematic drawings, and when describing embodiments of the present invention in detail, for convenience of explanation, the cross-sectional drawings showing the structure of the device will not be partially enlarged according to the general scale, and the schematic drawings are merely examples, and should not limit the scope of protection of the present invention herein

In addition, the three-dimensional dimensions of length, width and depth should be included in actual production.

Example 1

Referring to FIGS. 1 to 10, a positive and negative indicating device for measuring polarity is arranged, including a detection mechanism 100 including an upper housing 101 and a lower housing 102, a test portion 103 arranged inside the lower housing 102, and a guide portion 104 arranged on the lower housing 102, and a follower 105 arranged on the guide 104.

Further, the testing unit 103 includes a resistor 103a arranged on the lower housing 102, a first lamp body 103b and a second lamp body 103c arranged on the resistor 103a, a first diode 103d arranged on the resistor 103a, a test pen 103e and a second diode 103f arranged on the first diode 103d, and an elbow 103g arranged on the test pen 103e.

The resistor 103a is fixedly disposed at a central position inside the lower housing 102.

One end of the resistor 103a is connected to the first lamp body 103b and the second lamp body 103c, respectively, by an electric wire.

The other end of the resistor 103a is respectively connected to the two first diodes 103d by electric wires.

One end of the first diode 103d away from the resistor 103a is connected to the test pen 103e and the second diode 103f, respectively, by an electric wire.

Specifically, one end of the second diode 103f away from the first diode 103d is connected to the lamp body.

Further, the guide portion 104 includes a first guide groove 104a, a chute 104b, and a second guide groove 104c arranged on the lower housing 102.

The bottom surface inside the lower housing 102 and the top surface inside the upper housing 101 are arranged with a first guide groove 104a, a chute 104b, and a second guide groove 104c, respectively.

Specifically, the chute 104b is located between the first guide groove 104a and the second guide groove 104c, and the first guide groove 104a is adjacent to the resistor 103a, and the second guide groove 104c is far away from the resistor 103a.

Further, the follower portion 105 includes a sleeve 105a arranged on the test pen 103e, and a fixing rod 105b, a first limit ring 105c, and a second limit ring 105d arranged on the sleeve 105a.

The test pen 103e may be inserted into the inside of the sleeve 105a, and one end of the electric wire connected to the test pen 103e extends to the outside of the sleeve 105a.

Specifically, the cross section of the end portion of the test pen 103e is hexagonal, and when the test pen 103e is located inside the sleeve 105a, the sleeve 105a can prevent the test pen 103e from rotating.

The top and bottom portions of the sleeve 105a are connected to the fixing rod 105b.

Specifically, one end of one fixing rod 105b extends to the inside of the first guide groove 104a on the lower housing 102, and one end of the other fixing rod 105b extends to the inside of the first guide groove 104a on the upper housing 101, so that the restriction of the sleeve 105a is more stable by the arrangement of the upper housing 101 and the lower housing 102.

A first limit ring 105c is arranged at an end of the sleeve 105a away from the electric wire, and a second limit ring 105d is arranged at an end of the sleeve 105a adjacent to the electric wire.

Operation process: when the positive and negative poles of the object need to be determined, the staff need to hold two test pens 103e and contact the two test pens 103e with both ends of the object respectively. Refer to Figure 9, when the positive pole of the object contacts the test pen 103e on the left side, The current passes through the second diode 103f, the first lamp body 103b, the resistance 103a, the first diode 103d and the right test pen 103e in turn. At this time, the first lamp body 103b lights up the red light. Refer to Figure 10, when the positive pole of the object contacts the right test pen 103e, The current passes through the second diode 103f, the first lamp body 103b, the resistance 103a, the first diode 103d and the test pen 103e on the left side. At this time, the second lamp body 103c lights up green to determine the positive and negative poles of the object.

Example 2

Referring to FIGS. 1 to 8, this example is different from the first example in that the driving mechanism 200 includes a first sliding groove 201 arranged on the lower housing 102, a second sliding groove 202 and a through hole 203 arranged on the upper housing 101, a moving portion 204 arranged inside the first sliding groove 201, a resetting portion 205 and a driving portion 206 arranged on the moving portion 204, and a pulling portion 207 arranged on the resetting portion 205.

The second chute 202 is positioned directly above the first chute 201.

The penetration hole 203 is positioned directly above the second chute 202, and the penetration hole 203 and the second chute 202 penetrate each other.

Further, the moving portion 204 includes a moving block 204a arranged inside the first chute 201, and a groove 204b arranged on the moving block 204a.

The moving block 204 a has a groove 204 b on the side away from the resistor 103 a.

Specifically, an end of the sleeve 105a away from the electric wire extends to the inside of the groove 204b, and the first limiting ring 105c is located inside the groove 204b.

Specifically, by providing the first limiting ring 105c and the second limiting ring 105d, it is possible to prevent the sleeve 105a from being disengaged from the moving block 204a.

Further, the return portion 205 includes a slot 205 a arranged on the moving block 204 a, a first spring 205 b arranged inside the slot 205 a, and an insertion rod 205 c arranged on the first spring 205 b.

The slot 205a is arranged on the top of the moving block 204a.

The first spring 205b is completely located inside the slot 205a, and one end of the first spring 205b is connected to the inner wall of the slot 205a.

The top of the first spring 205b is connected to the insertion rod 205c, and the top end of the insertion rod 205c extends to the outside of the insertion slot 205a.

Further, the driving portion 206 includes a fixing plate 206 a arranged on the insertion rod 205 c, a first vertical rod 206 b and a second vertical rod 206 c arranged on the fixing plate 206 a, and a concave block 206 d arranged on the first vertical rod 206 b.

The top portion of the insertion rod 205 c is connected to the fixing plate 206 a.

Specifically, both sides of the fixing plate 206a are in contact with the inner wall of the second chute 202, respectively.

A first vertical rod 206b and a second vertical rod 206c are mounted on the top of the fixed rod 105b.

Specifically, the first vertical rod 206b and the second vertical rod 206c have the same size, and the first vertical rod 206b and the second vertical rod 206c extend to the outside of the upper housing 101 through the through hole 203.

The bottom portion of the concave block 206d is connected to the first vertical rod 206b and the second vertical rod 206c, respectively.

Specifically, by setting the concave block 206d, it is convenient for the worker to push the concave block 206d left and right when pressing the concave block 206d.

Further, the pulling portion 207 includes a storage groove 207 a arranged on the moving block 204 a, and a second spring 207 b arranged inside the storage groove 207 a.

An object groove 207 a is formed on a side wall of the moving block 204 a.

One end of the second spring 207 b is connected to the inner wall of the storage groove 207 a, and the other end of the second spring 207 b is connected to the inner wall of the first chute 201.

Operation process: when the staff needs to use the test pen 103e to test the positive and negative poles of the object, the staff pushes the concave block 206d left and right, so that the concave block 206d drives the first vertical rod 206b and the second vertical rod 206c, and the first vertical rod 206b drives the fixed plate 206a inside the first chute 201.

The fixed plate 206a drives the plunger 205c, and the plunger 205c drives the moving block 204a, so that the moving block 204a moves inside the first chute 201, while the moving block 204a drives the casing 105a and the second spring 207b, and the second spring 207b shrinks. Casing 105a drives fixing rod 105b to move inside the first guide groove 104a, when fixing rod 105b moves inside the chute 104b, fixing rod 105b drives casing 105a to extend outside the groove 204b, casing 105a drives the first limit ring 105c and test pen 103e to move together.

When the fixed rod 105b is moved from chute 104b to the inside of the second guide groove 104c, the casing 105a drives the part of the test pen 103e to extend out of groove 204b. At this time, the staff can pull the elbow 103g through the setting of the second limit ring 105d. It can prevent the test pen 103e from pulling out the casing 105a at the same time, so that the test pen 103e and casing 105a are separated, and it is convenient for the staff to test the object. At this time, the staff releases the hand pushing the concave block 206d, the second spring 207b will drive the moving block 204a, and the moving block 204a will drive the casing 105a. The casing 105a drives the fixing rod 105b from the second guide groove 104c back to the interior of the first guide groove 104a, so that the moving block 204a and the casing 105a are restored to the initial position.

When the staff is finished using the test pen 103e, it is necessary to put the test pen 103e into storage. The staff will put the end of the test pen 103e with the elbow 103g towards themselves, and insert the grip of the test pen 103e into the inside of the sleeve 105a to prevent the test pen 103e from being damaged by collision.

Example 3

Referring to FIGS. 3 to 8, this embodiment is different from the above embodiment in that the switching mechanism 300 includes a switching portion 301 arranged on the upper housing 101 and a restricting portion 302 arranged on the driving portion 206.

Further, the switching portion 301 includes a wide groove 301a and a narrow groove 301b arranged in the upper housing 101.

Both the wide groove 301a and the fine groove 301b are arranged on the inner wall of the through hole 203, and the wide groove 301a is positioned directly above the fine groove 301b, and at the same time, one end of the wide groove 301a away from the moving block 204a and the fine groove 301b penetrate each other.

Specifically, the width dimension of the wide groove 301a is twice the width dimension of the thin groove 301b.

Further, the restricting portion 302 includes a short rod 302a arranged on the first vertical rod 206b, a first tooth groove 302b arranged on the upper housing 101, and a second tooth groove 302c arranged on the fixing plate 206a.

A short rod 302a is installed on the side wall of the first vertical rod 206b, and both ends of the short rod 302a respectively penetrate the first vertical rod 206b and extend into the inside of the wide groove 301a.

The first tooth groove 302b is arranged between the through hole 203 and the second chute 202, and the first tooth groove 302b and the second chute 202 penetrate each other, and the first tooth groove 302b and the through hole 203 penetrate each other.

The second tooth groove 302c is arranged on the top of the fixing plate 206a.

Specifically, when the short rod 302a is located inside the wide groove 301a, the first tooth groove 302b and the second tooth groove 302c mesh with each other, and when the short rod 302a is located inside the thin groove 301b, the first tooth groove 302b and the second tooth groove 302c partially mesh with each other.

Operation process: When the staff need to use the crocodile clamp to hold the test pen 103e, it is not necessary to pull out the test pen 103e completely from the inside of the casing 105a. At this time, in order to prevent the second spring 207b from restoring the casing 105a to the initial position, it is necessary to fix the position of the moving block 204a. The staff first press the concave block 206d. The concave block 206d drives the first vertical rod 206b and the second vertical rod 206c down, and the first vertical rod 206b drives the short rod 302a and the fixed plate 206a down respectively, making the side wall of the short rod 302a contact the bottom of the wide slot 301a. At this time, the first vertical rod 206b cannot continue to fall. When the fixed plate 206a drives the plunger 205c down, the fixed plate 206a is separated from the first groove 302b, and the plunger 205c drives the first spring 205b to shrink. At this time, the staff pushes the concave block 206d horizontally, and the concave block 206d drives the first vertical rod 206b and the second vertical rod 206c to move. When the first vertical rod 206b moves towards the end of wide slot 301a, the plunging rod 205c drives the moving block 204a, the moving block 204a drives the second spring 207b to shrink, the moving block 204a drives the casing 105a, and the casing 105a drives the fixed rod 105b to move from the first guide groove 104a to the second guide groove 104c.

The casing 105a drives the test pen 103e part to extend out of the groove 204b, the staff removes the pressure force, the first spring 205b drives the plunger 205c to rise, the plunger 205c drives the fixed plate 206a to rise, and the fixed plate 206a drives the second groove 302c to engage with the first groove 302b. At this time, the staff loosen the concave block 206d, and the moving block 204a can not be moved, so that the staff can respectively clip the test pen 103e and the object with the crocodile clip, and facilitate the staff to record while observing.

When some objects cannot be held by crocodile clips, test pen 103e is required to contact the objects for testing. At this time, in order to facilitate the staff to record and observe at the same time, the staff will continue to press the concave block 206d to separate the first slot 302b from the second slot 302c, and continue to push the concave block 206d. When the first vertical rod 206b moves to the end of the wide slot 301 a, the short rod 302a drops to the inside of the thin slot 301b because the short rod 302a loses the barrier of the inner wall of the wide slot 301a. At this time, the staff removes the thrust retaining pressure. When the short rod 302a is completely located inside the thin slot 301b, the concave block 206d is released. The first spring 205b cannot be recovered, the first tooth groove 302b and the second tooth groove 302c cannot engage, the second spring 207b restores the moving block 204a, the moving block 204a drives the casing 105a to move, and the casing 105a drives the test pen 103e to contact the two ends of the object through the setting of elbow 103g. It can be more convenient to contact both sides of the object to test the positive and negative poles of the object.

When the test is completed, the staff pushes the concave block 206d so that the concave block 206d moves to the joint of the thin groove 301b and the wide groove 3013, the first spring 205b will drive the insert rod 205c to rise, the insert rod 205c will drive the fixed plate 206a to rise, and the fixed plate 206a will drive the first vertical rod 206b and the second vertical rod 206c to rise. The first vertical rod 206b drives the short rod 302a to re-enter the inside of the wide groove 301a, removes the thrust to ensure a certain pressure, so that the first groove 302b engages with the second groove 302c, and the second spring 207b can restore and drive the casing 105a back to the initial position.

At this time, the test pen 103e is finished, and the staff goes out to press the pressure.

To facilitate the subsequent use of test pen 103e.

Importantly, it is to be noted that the configurations and arrangements of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure will readily appreciate that many modifications are possible (e.g., variations in dimensions, dimensions, structures, shapes, and proportions of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as being integrally formed may be composed of a plurality of parts or elements, the position of the elements may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Accordingly, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover structures described herein that perform the function, and are not only structurally equivalent but also equivalent structures. Other substitutions, modifications, changes, and omissions may be made in the design, operating condition, and arrangement of the exemplary embodiments without departing from the scope of the invention. Accordingly, the present invention is not limited to particular embodiments, but is extended to various modifications that still fall within the scope of the appended claims.

Furthermore, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments (i.e., those features that are not relevant to the best mode of performing the present invention currently under consideration, or those features that are not relevant to implementing the present invention) may not be described.

It should be understood that during the development of any actual embodiment, as in any engineering or design project, numerous embodiment decisions may be made. Such a development effort may be complex and time consuming, but would be a routine task of design, manufacture, and production for those of ordinary skill who benefit from this disclosure without requiring undue experimentation.

Although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and should be covered by the scope of the claims of the present invention.

Claims (10)

1. À positive and negative indicating device for measuring polarity, comprising, a detection mechanism (100), comprising an upper housing (101) and a lower housing (102), a test portion (103) arranged inside the lower housing (102), a guide portion (104) arranged at the lower housing (102), and a follower portion (105) arranged at the guide portion (104); a driving mechanism (200), comprising a first sliding groove (201) disposed at the lower housing (102), a second sliding groove (202) and a penetration hole (203) disposed at the upper housing (101), a moving portion (204) arranged inside the first sliding groove (201), a resetting portion (205) and a driving portion (206) arranged at the moving portion (204), and a pulling portion (207) arranged at the resetting portion (205); and a switching mechanism (300), comprising a switching portion (301) arranged at the upper housing (101), and a restricting portion (302) arranged at the driving portion (206).

2. The positive and negative indicating device for measuring polarity according to claim 1, wherein the test part (103) comprises a resistor (103a) arranged at the lower housing (102), a first lamp body (103b) and a second lamp body (103c) arranged at the resistor (103a), a first diode (103d) arranged at the resistor (103a), a test pen (103e) and a second diode (103f) arranged at the first diode (103d), and an elbow (103g) arranged at the test pen (103e).

3. The positive and negative indicating device for measuring polarity according to claim 2, wherein the guide portion (104) comprises a first guide groove (104a), a chute (104b) and a second guide groove (104c) disposed at the lower housing (102).

4. The positive and negative indicating device for measuring polarity according to claim 2, wherein the follower portion (105) comprises a sleeve (105a) arranged at the test pen (103e), and a fixing rod (105b), a first limiting ring (105c) and a second limiting ring (105d) arranged at the sleeve (105a).

5. The positive and negative indicating device for measuring polarity according to claim 1, wherein the moving portion (204) comprises a moving block (204a) arranged inside the first chute (201) and a groove (204b) disposed at the moving block (204a).

6. The positive and negative indicating device for measuring polarity according to claim 4, wherein the resetting portion (205) comprises a slot (205a) disposed at the moving block (204a), a first spring (205b) arranged inside the slot (205a), and a plug (205c) arranged at the first spring (205b).

7. The positive and negative indicating device for measuring polarity according to claim 6, wherein the driving portion (206) comprises a fixing plate (206a) arranged at the plug (205c), a first vertical rod (206b) and a second vertical rod (206c) arranged at the fixing plate (206a), and a concave block (206d) arranged at the first vertical rod (206b).

8. The positive and negative indicating device for measuring polarity according to claim 6, wherein the pulling portion (207) comprises a holding groove (207a) disposed at the moving block (204a) and a second spring (207b) arranged inside the holding groove (207a).

9. The positive and negative indicating device for measuring polarity according to claim 7, wherein the switching portion (301) comprises a wide groove (301a) and a thin groove (301b) disposed at the upper housing (101).

10. The positive and negative indicating device for measuring polarity according to claim 9, wherein the restricting portion (302) comprises a short rod (302a) arranged at the first vertical rod (206b), a first tooth groove (302b) disposed at the upper housing (101), and a second tooth groove (302c) disposed at the fixing plate (206a).