Direct-current universal polarity measuring instrument

Abstract

The invention discloses a direct-current universal polarity measuring instrument, which relates to the technical field of absorption tower flue inlet flushing, and comprises a measuring unit, an instrument box, a direct-current meter, a shunt, a resistor, four groups of binding posts, a knob and a battery, and the storage unit comprises an isolation plate, two trigger assemblies, a buckle, a jacking assembly, a connecting column and a fixing piece. The instrument box has the beneficial effects that complete separation of the binding post and the line in a non-use state is realized, the risk of short circuit of the line is effectively avoided, the binding post is quickly recycled in the instrument box, and the situation that dust easily falls on the inner side of the binding post, and normal use of the binding post is affected is prevented. In addition, damage possibly caused by frequent plugging and unplugging of the binding post in the prior art is avoided, and the effects of quick separation and adaptation of various models can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of polarity measurement, in particular to a DC universal polarity measuring instrument. Background Art

[0002] During the completion inspection and measurement of 10kV and below power expansion projects, power distribution personnel often face a tedious task: polarity testing and wiring inspection of generators, motors, transformers, mutual inductors and other equipment. These tasks not only require the operation of a large number of bulky equipment and instruments, but also the task of determining the number of pole pairs and speed of generators and motors with unclear or missing nameplates becomes more complicated. Traditional methods rely on a variety of tools and human resources, including using tachometers to measure the number of revolutions, checking the number of stator slots and coil pitch, etc. These tasks are not only time-consuming and labor-intensive, but also increase the safety risks of personnel and equipment in the process of using numerous tools. Therefore, a convenient polarity measurement meter is needed.

[0003] In addition, existing measuring instruments usually lack the necessary protection functions, which makes the external terminals easily damaged by external vibrations, and dust easily accumulates inside the terminals when not used for a long time, affecting their normal use and measurement accuracy. These problems have increased the burden and inconvenience of the daily work of power distribution personnel to a certain extent. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a DC universal polarity measuring instrument, which can solve the problem of lack of a convenient polarity measuring tool and the problem that the existing measuring instruments do not have a protection function.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A DC universal polarity measuring instrument, comprising a measuring unit, including an instrument box, a DC meter arranged inside the instrument box, a shunt arranged behind the DC meter, a resistor arranged on one side of the shunt, four groups of terminals arranged on the side of the instrument box, a knob arranged on one side of the resistor, and a battery arranged on one side of the knob;

[0007] Also includes a storage unit arranged around the terminal:

[0008] The storage unit can fold and store the terminal.

[0009] As a preferred solution of the DC universal polarity meter described in the present invention, the storage unit includes an isolation plate arranged on the inner interlayer of the instrument box, two groups of trigger components arranged above the isolation plate, a buckle arranged on one side of each group of trigger components, a lifting component arranged on one side of the trigger component, a connecting column arranged on one side of the lifting component, and a fixing member arranged at the front end of the connecting column.

[0010] As a preferred solution of the DC universal polarity measuring instrument of the present invention, the trigger assembly includes a guide groove fixedly arranged on the isolation plate, a large spring arranged inside the guide groove, and a sliding rod arranged at the front end of the large spring.

[0011] As a preferred solution of the DC universal polarity measuring instrument of the present invention, the sliding rod comprises a pull rod arranged at the front end of the large spring, a buckle ear arranged at the front end of the pull rod, and a sliding button arranged at the top end of the pull rod;

[0012] The buckle comprises a claw movably engaged with the buckle ear, and a release rod arranged at the front end of the claw.

[0013] As a preferred solution of the DC universal polarity measuring instrument of the present invention, the lifting assembly includes a protrusion fixedly arranged on the side wall of the pull rod and a connecting piece arranged on the inner side of the protrusion.

[0014] As a preferred solution of the DC universal polarity measuring instrument of the present invention, wherein: the protrusion includes a clamping block fixedly connected to the pull rod, and a ladder block arranged on one side of the clamping block;

[0015] A sliding groove is provided inside the ladder block, and one side of the ladder block is arranged as a first inclined surface.

[0016] As a preferred solution of the DC universal polarity measuring instrument of the present invention, the connecting member includes a small spring fixed on one side of the slide slot and a connecting block arranged on one side of the small spring.

[0017] As a preferred solution of the DC universal polarity measuring instrument of the present invention, wherein: the connecting column comprises an outer copper column, a limit block arranged on the inner side of the outer copper column, and a sliding sleeve arranged above the outer copper column;

[0018] The limit block includes an L-shaped groove arranged on the inner side thereof;

[0019] The sliding sleeve comprises extension rods arranged on both sides thereof.

[0020] As a preferred solution of the DC universal polarity measuring instrument of the present invention, wherein: the fixing member comprises an L-shaped block arranged on one side of the first inclined surface, and a limit frame slidably arranged on one side of the L-shaped block;

[0021] The L-shaped block includes a second inclined surface disposed at the bottom thereof.

[0022] As a preferred solution of the DC universal polarity measuring instrument of the present invention, wherein: the terminal comprises a sliding seat arranged in the L-shaped groove, a copper rod arranged above the sliding seat, and a petal-shaped column arranged above the copper rod;

[0023] A convex ring is arranged on the inner side of the petal-shaped column;

[0024] The sliding sleeve is slidably sleeved on the outside of the petal-shaped column;

[0025] One side of the sliding seat is fixedly connected to the connecting block.

[0026] Beneficial effects of the present invention: With the setting of the measuring unit and the storage unit, the present device realizes the complete separation of the terminal and the circuit when not in use, effectively avoiding the risk of circuit short circuit, and quickly recovering the terminal inside the instrument box to prevent dust from easily falling on the inside of the terminal and affecting its normal use. In addition, it also avoids the damage that may be caused by the traditional frequent plugging and unplugging of the terminal, and can achieve the effect of quick detachment and adaptation of multiple models. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The figure is the principle wiring diagram of the DC universal polarity measuring instrument of the present invention.

[0029] Figure 2 The figure is a schematic diagram of the overall structure of the DC universal polarity measuring instrument of the present invention.

[0030] Figure 3 The figure is an exploded schematic diagram of the internal structure of the DC universal polarity measuring instrument of the present invention.

[0031] Figure 4 It is a schematic diagram of the local structural fracture of the DC universal polarity measuring instrument of the present invention.

[0032] Figure 5 for Figure 3 Schematic diagram of the local structure of the storage unit.

[0033] Figure 6 It is a schematic diagram of the structure of the trigger assembly and the lifting assembly of the present invention.

[0034] Figure 7 It is a schematic diagram of the connecting column structure of the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Example 1, reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, and provides a DC universal polarity measuring instrument, which includes a measuring unit 100, including an instrument box 101, a DC meter 102 arranged inside the instrument box 101, a shunt 103 arranged behind the DC meter 102, a resistor 104 arranged on one side of the shunt 103, four groups of terminals 105 arranged on the side of the instrument box 101, a knob 106 arranged on one side of the resistor 104, and a battery 107 arranged on one side of the knob 106;

[0039] The storage unit 200 is also provided on the side of the terminal 105:

[0040] The storage unit 200 can fold and store the terminal post 105 .

[0041] It should be noted that the DC meter 101 used in this device is a DC 1000UA positive and negative meter head, and its induced current is relatively sensitive. Secondly, the knob 106 is a 2-layer 5-position switch for the conversion switch, and the battery 107 is selected as a 1.5V lithium battery 1.5V-6V1500MA 4-section 1.5V. In order to reduce the need for workers to use bulky tools and equipment, improve work efficiency, and reduce operational safety risks, a DC meter 101, shunts, resistors, connecting wires, terminals, a battery box 4-position, a 2-layer 5-position switch for the conversion switch, a battery 107 DC lithium battery 1.5V-6V1500MA, a charging box 4-position, a battery voltage display, a quick measurement connecting wire, a button, etc. are scientifically and rationally used to make a DC universal polarity measuring instrument.

[0042] According to the coil impedance, the DC voltage of the conversion switch is selected. The staff can easily and efficiently determine the polarity of the electromagnetic induction coil and the number of times of the residual magnetic induction cutting principle. After connecting a DC universal polarity measuring instrument to the head and tail of any phase coil of the generator or motor, the generator or motor rotor is rotated one circle to easily measure the number of pole pairs and the speed, and know how many poles the motor belongs to.

[0043] like Figure 1 The principle shown is the method of using the transformer polarity tester: the coil impedance is reasonable and the DC voltage gear of the conversion switch is quickly selected. The voltage display is clear. The polarity measuring instrument uses the DC method to determine the primary and secondary wiring polarity of the transformer. The primary terminals L1 and L2 of the measuring instrument are respectively connected to the primary P1 and P2 of the transformer. The secondary terminals S1 and S2 of the polarity measuring instrument are respectively connected to the secondary connecting wires of the transformer to the s1 and s2 at the lower end of the junction box. After the loop is formed, the current / voltage on and off is controlled by the measuring button, and the closing / opening is determined by observing the direction of the deviation of the mechanical pointer of the DC display meter.

[0044] Example 2, reference Figure 1 to Figure 7 , which is the second embodiment of the present invention, and is different from the first embodiment in that: it also includes a measuring unit 100, including an instrument box 101, a DC meter 102 arranged inside the instrument box 101, a shunt 103 arranged behind the DC meter 102, a resistor 104 arranged on one side of the shunt 103, four groups of terminals 105 arranged on the side of the instrument box 101, a knob 106 arranged on one side of the resistor 104, and a battery 107 arranged on one side of the knob 106;

[0045] The storage unit 200 is also provided on the side of the terminal 105:

[0046] The storage unit 200 can fold and store the terminal post 105 .

[0047] Furthermore, the storage unit 200 includes an isolation plate 201 arranged on the inner layer of the instrument box 101, two groups of trigger components 202 arranged above the isolation plate 201, a buckle 203 arranged on one side of each group of trigger components 202, a lifting component 204 arranged on one side of the trigger component 202, a connecting column 205 arranged on one side of the lifting component 204, and a fixing part 206 arranged at the front end of the connecting column 205.

[0048] Furthermore, the trigger assembly 202 includes a guide groove 202a fixedly disposed on the isolation plate 201, a large spring 202b disposed inside the guide groove 202a, and a sliding rod 202c disposed at the front end of the large spring 202b.

[0049] Furthermore, the sliding rod 202c includes a pull rod 202c-1 disposed at the front end of the large spring 202b, a buckle ear 202c-2 disposed at the front end of the pull rod 202c-1, and a sliding button 202c-3 disposed at the top end of the pull rod 202c-1;

[0050] The buckle 203 includes a claw 203a movably engaged with the buckle ear 202c-2, and a release rod 203b disposed at the front end of the claw 203a.

[0051] Furthermore, the lifting assembly 204 includes a protrusion 204a fixedly disposed on the side wall of the pull rod 202c-1 and a connecting member 204b disposed inside the protrusion 204a.

[0052] Furthermore, the protrusion 204a includes a clamping block 204a-1 fixedly connected to the pull rod 202c-1, and a ladder block 204a-2 disposed on one side of the clamping block 204a-1;

[0053] A sliding groove 204a - 21 is formed inside the ladder block 204a - 2 , and one side of the ladder block 204a - 2 is configured as a first inclined surface 204a - 22 .

[0054] Furthermore, the connecting member 204b includes a small spring 204b-1 fixed on one side of the slide slot 204a-21, and a connecting block 204b-2 arranged on one side of the small spring 204b-1.

[0055] Furthermore, the connecting column 205 includes an outer copper column 205a, a limit block 205b disposed inside the outer copper column 205a, and a sliding sleeve 205c disposed above the outer copper column 205a;

[0056] The limit block 205b includes an L-shaped groove 205b-1 disposed on the inner side thereof;

[0057] The sliding sleeve 205c includes extension rods 205c-1 disposed on both sides thereof.

[0058] Furthermore, the fixing member 206 includes an L-shaped block 206a disposed on one side of the first inclined surface 204a-22.

[0059] and a limiting frame 206b slidably disposed on one side of the L-shaped block 206a;

[0060] The L-shaped block 206a includes a second inclined surface 206a-1 disposed at the bottom thereof.

[0061] Furthermore, the terminal 105 includes a sliding seat 105a disposed in the L-shaped groove 205b-1, a copper rod 105b disposed above the sliding seat 105a, and a petal-shaped column 105c disposed above the copper rod 105b;

[0062] A convex ring 105c-1 is provided inside the petal-shaped column 105c;

[0063] The sliding sleeve 205c is slidably sleeved on the outside of the petal-shaped column 105c

[0064] One side of the sliding seat 105a is fixedly connected to the connecting block 204b-2.

[0065] It should be noted that the storage unit 200 can fold and store the assembled four groups of terminal posts 105 to avoid the influence of the external environment on the terminal posts, thereby reducing the impact of dust and reducing the damage to the terminal posts 105 caused by plugging and unplugging during the movement of the terminal posts 105.

[0066] Better, such as Figure 3 As shown, a suspension rib is fixedly arranged around the inner side of the instrument box 101, and an isolation plate 201 is clamped on the suspension rib, and the storage unit 200 is conveniently installed on the isolation plate 201. Among them, the terminal posts 105 are respectively arranged on the peripheral side of the instrument box 101, and are arranged together in pairs. A group of trigger components 202 is fixedly arranged on the inner side of each group of terminal posts 105, and the trigger component 202 can drive the terminal posts 105 to rotate and fold. Figure 4 As shown, the trigger assembly 202 is composed of a guide groove 202a fixedly connected to the isolation plate 201, a large spring 202b arranged inside the guide groove 202a, and a sliding rod 202c at the front end of the large spring 202b. The guide groove 202a can be an integral structure with the isolation plate 201, and can be made of plastic with good mechanical strength and insulation performance. A rectangular large spring 202b is fixedly connected to the bottom of the guide groove 202a. Similarly, a sliding rod 202c is fixedly connected to the front end of the large spring 202b. Two sets of snap-in holes are provided on the sliding rod 202c according to the positional relationship of the terminal 105, and the snap-in holes can provide a motion connection for the rotation of the jacking assembly 204.

[0067] Better, such as Figure 5As shown, a sliding button 202c-3 extends from the rod body of the sliding rod 202c, and the sliding button 202c-3 can directly pull the large spring 202b at the rear end of the sliding rod 202c to stretch. In addition, in order to facilitate the movement of the sliding button 202c-3, a slot is provided at the corresponding position of the guide groove 202a. Two groups of buckle ears 202c-2 extend to both sides from the front end of the sliding rod 202c. A group of buckles 203 are movably connected to the side wall of the instrument box 101 in front of the buckle ears 202c-2, wherein the buckle 203 is composed of a claw 203a that matches the buckle ears 202c-2. The claw 203a is an elastic plastic part, which can be just caught in the claw 203a during the forward movement of the buckle ears 202c-2. The release rod 203b is fixedly connected to the rear of the claw 203a, and the release rod 203b is composed of three groups of rods, two of which are fixedly connected to the instrument box 101, and the middle rod is slidably connected to the instrument box 101. When the release rod 203b is pushed backward, the claw 203a will extend outward, which can release the restriction on the buckle ear 202c-2 and allow the sliding rod 202c to retract as a whole.

[0068] Better, such as Figure 6 As shown, the two groups of snap-in holes provided on the sliding rod 202c are connected to the lifting assembly 204. The lifting assembly 204 is composed of a protrusion 204a and a connecting piece inside the protrusion 204a. The protrusion 204a is specifically made of plastic material, and is composed of a snap-in block 204a-1 snap-in with the snap-in hole on the sliding rod 202c, and a ladder block 204a-2 on one side of the snap-in block 204a-1. A slide groove 204a-21 is provided on the inner side of the ladder block 204a-2, and a group of small springs 204b-1 are fixedly connected to the front end of the slide groove 204a-21, and a group of connecting blocks 204b-2 are fixedly connected to the rear end of the small spring 204b-1. The connecting piece 204b can ensure that the sliding rod 202c is continuously retreated, avoiding interference with the movement of the connecting column 205.

[0069] Better, such as Figure 6 As shown, the terminal 105 is composed of a sliding seat 105a at the bottom, a copper rod 105b above the sliding seat 105a, and a petal-shaped column 105c above the copper rod 105b. The sliding seat 105a, the copper rod 105b and the petal-shaped column 105c are all made of copper materials and can conduct electricity. Two groups of extension rods are formed at both ends of the sliding seat 105a. The connecting column 205 is composed of an outer copper column 205a, a limit block 205b, and a sliding sleeve 205c sleeved on the outer side of the petal-shaped column 105c. The outer copper column 205a is made of copper material and can conduct electricity, while the limit block 205b is made of insulating material and serves to disconnect the sliding seat 105a from the circuit during movement. The limit block 205b is engaged in the receiving groove on the inner side of the outer copper column 205a. The extension rod on one side of the sliding seat 105a is hinged with the connecting block 204b-2.

[0070] Better, such as Figure 7 As shown, an L-shaped groove 205b-1 is opened in the limit block 205b. The shape of the L-shaped groove 205b-1 is a horizontal groove on the upper side, and a vertical groove is opened in the forward extending direction, so that when the connecting block 204b-2 moves toward the rear end, it pushes the sliding seat 105a to move along the L-shaped groove 205b-1, so that the terminal 105 originally in a horizontal state rotates counterclockwise to a vertical state, so that one side of the sliding seat 105a moves from a state of not contacting the outer copper column 205a to a state of contacting the outer copper column 205a, thereby realizing the closing / disconnection of the terminal 105 and the circuit at the bottom of the isolation plate 201, and realizing complete disconnection from the circuit when not in use, thereby avoiding circuit short circuit.

[0071] Better, such as Figure 6 As shown, the petal-shaped column 105c is in the shape of a petal extending outward and has a certain degree of elasticity. A convex ring 105c-1 protruding inward is provided inside the column, and its aperture is larger than the size of the connecting wire to adapt to the use of connecting wire plug-in sections of various sizes. When in use, the connecting wire plug-in section can be quickly inserted without opening the convex ring 105c-1, avoiding damage after multiple plug-ins.

[0072] In addition, if Figure 7 As shown, a first inclined surface 204a-22 with an inclined surface facing downward is provided at the rear end of the ladder block 204a-2, and a fixing member 206 is provided at the rear end of the first inclined surface 204a-22, and the fixing member 206 is composed of an L-shaped block 206a matched with the first inclined surface 204a-22, and a limiting frame 206b on both sides of the L-shaped block 206a. The limiting frame 206b can limit the L-shaped block 206a at this position, and a second inclined surface 206a-1 matched with the first inclined surface 204a-22 is provided at the bottom of the L-shaped block 206a. When the ladder block 204a-2 moves backward, the first inclined surface 204a-22 will lift the second inclined surface 206a-1, thereby lifting the sliding sleeve 205c, compressing the petal-shaped column 105c to shrink inward, thereby clamping the plug-in section of the connecting line.

[0073] Usage process: It can be divided into two steps.

[0074] During the first measurement: the staff starts the unlocking mechanism by pushing the release rods 203b on both sides of the instrument box 101 inward. This causes the claws 203a to expand outward and release the lock on the buckle ear 202c-2. Subsequently, the sliding rod 202c retracts under the elastic force of the large spring 202b, driving the clamping block 204a-1 and the ladder block 204a-2 clamped therein to move backward. This action first triggers the uncompressed small spring 204b-1, whose elastic force drives the connecting block 204b-2, pushing the sliding seat 105a to move along the L-shaped groove 205b-1. This causes the terminal 105, which was originally in a horizontal state, to rotate counterclockwise to a vertical position, realizing the transition from a horizontal state to a vertical state. As it rotates, one side of the sliding seat 105a changes from a non-contact state with the outer copper column 205a to a contact state. This continuous action ensures that the terminal 105 and the bottom line of the isolation plate 201 are changed from being disconnected to being closed, thereby realizing a one-time connection of the line. Afterwards, the sliding rod 202c continues to retreat, and the small spring 204b-1 begins to be compressed. The sliding sleeve 205c sleeved on the outside of the petal-shaped column 105c will also move from a horizontal position to a vertical position, and the extension rods 205c-1 on both sides of the sliding sleeve 205c are placed on the L-shaped block 206a. The first inclined surface 204a-22 and the second inclined surface 206a-1 slide to lift the L-shaped block 206a, and finally lift the sliding sleeve 205c, thereby compressing the petal-shaped column 105c inward, thereby clamping the plug-in section of the connecting line, thereby realizing secondary connection of the line.

[0075] When recycling, slide the upper sliding button 202c-3 to move the sliding rod 202c forward, and then lower the sliding sleeve 205c, so that the petal-shaped column 105c will explode outward by itself, so that the external connection line can be quickly disconnected. Then, the vertical terminal 105 is rotated clockwise to a horizontal position, so that the sliding seat 105a is no longer in contact with the outer copper column 205a, and it can be completely separated from the line when not in use. Finally, the buckle ear 202c-2 is engaged with the claw 203a to complete the fixing function.

[0076] In summary, the device, with the setting of the measuring unit 100 and the storage unit 200, realizes the complete separation of the terminal 105 from the circuit when not in use, effectively avoiding the risk of short circuit, and quickly recovering the terminal 105 inside the instrument box 101, preventing the inner side of the terminal 105 from being easily covered with dust, which affects its normal use. In addition, it also avoids the damage that may be caused by the traditional frequent plugging and unplugging of the terminal 105, and can achieve the effect of quick detachment and adaptation of multiple models.

[0077] It is important to note that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A DC universal polarity measuring instrument, characterized in that: include, A measuring unit (100), comprising an instrument box (101), a DC meter (102) arranged inside the instrument box (101), a shunt (103) arranged behind the DC meter (102), a resistor (104) arranged on one side of the shunt (103), four groups of connecting posts (105) arranged on the side of the instrument box (101), a knob (106) arranged on one side of the resistor (104), and a battery (107) arranged on one side of the knob (106); It also includes a storage unit (200) arranged on the peripheral side of the terminal (105): The storage unit (200) can fold and store the terminal (105).

2. The DC universal polarity measuring instrument according to claim 1, characterized in that: The storage unit (200) comprises an isolation plate (201) arranged on the inner interlayer of the instrument box (101), two groups of trigger components (202) arranged above the isolation plate (201), a buckle (203) arranged on one side of each group of the trigger components (202), a lifting component (204) arranged on one side of the trigger components (202), a connecting column (205) arranged on one side of the lifting component (204), and a fixing member (206) arranged at the front end of the connecting column (205).

3. The DC universal polarity measuring instrument as claimed in claim 2, characterized in that: The trigger assembly (202) comprises a guide groove (202a) fixedly arranged on the isolation plate (201), a large spring (202b) arranged inside the guide groove (202a), and a sliding rod (202c) arranged at the front end of the large spring (202b).

4. The DC universal polarity measuring instrument as claimed in claim 3, characterized in that: The sliding rod (202c) comprises a pull rod (202c-1) arranged at the front end of the large spring (202b), a buckle ear (202c-2) arranged at the front end of the pull rod (202c-1), and a sliding button (202c-3) arranged at the top end of the pull rod (202c-1); The buckle (203) comprises a claw (203a) movably engaged with the buckle ear (202c-2), and A release rod (203b) is arranged at the front end of the clamping claw (203a).

5. The DC universal polarity measuring instrument as claimed in claim 4, characterized in that: The lifting assembly (204) comprises a protrusion (204a) fixedly arranged on the side wall of the pull rod (202c-1) and a connecting piece (204b) arranged on the inner side of the protrusion (204a).

6. The DC universal polarity measuring instrument as claimed in claim 5, characterized in that: The protrusion (204a) comprises a clamping block (204a-1) fixedly connected to the pull rod (202c-1), and a ladder block (204a-2) arranged on one side of the clamping block (204a-1); A sliding groove (204a-21) is provided inside the ladder block (204a-2), and one side of the ladder block (204a-2) is provided as a first inclined surface (204a-22).

7. The DC universal polarity measuring instrument as claimed in claim 6, characterized in that: The connecting member (204b) comprises a small spring (204b-1) fixed on one side of the sliding groove (204a-21), and a connecting block (204b-2) arranged on one side of the small spring (204b-1).

8. The DC universal polarity measuring instrument as claimed in claim 7, characterized in that: The connecting column (205) comprises an outer copper column (205a), a limit block (205b) arranged on the inner side of the outer copper column (205a), and a sliding sleeve (205c) arranged above the outer copper column (205a); The limiting block (205b) comprises an L-shaped groove (205b-1) arranged on the inner side thereof; The sliding sleeve (205c) comprises extension rods (205c-1) arranged on both sides thereof.

9. The DC universal polarity measuring instrument as claimed in claim 8, characterized in that: The fixing member (206) comprises an L-shaped block (206a) arranged on one side of the first inclined surface (204a-22), and a limiting frame (206b) slidably arranged on one side of the L-shaped block (206a); The L-shaped block (206a) includes a second inclined surface (206a-1) arranged at the bottom thereof.

10. The DC universal polarity measuring instrument as claimed in claim 9, characterized in that: The terminal post (105) comprises a sliding seat (105a) arranged in the L-shaped groove (205b-1), a copper rod (105b) arranged above the sliding seat (105a), and a petal-shaped column (105c) arranged above the copper rod (105b); A convex ring (105c-1) is arranged on the inner side of the petal-shaped column (105c); The sliding sleeve (205c) is slidably sleeved on the outside of the petal-shaped column (105c) One side of the sliding seat (105a) is fixedly connected to the connecting block (204b-2).

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