Current pin

Abstract

The utility model discloses a current pin which comprises a rod body and a contact head, the contact head is arranged at the bottom of the rod body, the top end of the rod body is provided with a push rod, the top end of the push rod is provided with a clamping tongue piece, and the top end of the clamping tongue piece is provided with a pressing head. One side of the inner wall of the insulating shell is fixedly connected with a first limiting ring and a second limiting ring, and the top of the second limiting ring is provided with a locking piece. Through cooperation of a spring, a locking piece, a push rod and a clamping tongue piece, a rod body and a contact head are cast into a whole, beryllium copper and an aluminum rod are well combined, conductivity is excellent, use of copper materials can be reduced, cost is reduced, the push rod is pressed to drive the clamping tongue piece to be clamped to the locking piece, and the bottom end of the push rod pushes the rod body and the contact head to stretch out of an insulation shell. Appropriate pressure is provided through the spring, good contact between the contact head and a test point is ensured, and after the test is completed, the rod body and the contact head are accommodated in the insulating shell, so that the contact head can be better protected, and the risk of damage or abrasion is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of current needles, in particular to a current needle. Background Art

[0002] A current needle is a tool for measuring electric current. It usually consists of a thin metal needle or pointer, a movable dial, and a wire connected to the circuit. When current flows through the wire, it causes the needle to deflect, indicating the strength of the current. The current needle can be used for current measurement in both DC and AC circuits.

[0003] The probe contact head material currently used in the market is beryllium copper, and the rod material is brass or copper. The combination of beryllium copper and brass or the combination of beryllium copper and copper has poor conductivity. Although beryllium copper and copper have excellent conductivity, copper is very sticky and easily sticks to the processed blade. The inner hole of the rod is difficult to process and is not convenient for processing and production. The existing external insulating sleeve of the current needle is fixed in position and can only provide insulation effect but cannot adjust the position of the insulating shell to protect the contact head. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art that the probe contact head material currently used in the market is beryllium copper, the rod material is brass or red copper, the combination of beryllium copper and brass or the combination of beryllium copper and red copper, the combination of beryllium copper and brass has poor electrical conductivity, although the electrical conductivity of beryllium copper and red copper is excellent, the red copper material has high viscosity and is easy to stick to the processed blade, the inner hole of the rod is difficult to process, and it is not convenient for processing and production, the position of the existing external insulating sleeve of the current needle is fixed, and it can only provide an insulating effect but cannot adjust the position of the insulating shell to protect the contact head, and a current needle is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A current needle comprises a rod body and a contact head, wherein the contact head is arranged at the bottom of the rod body, a push rod is arranged at the top of the rod body, a tongue piece is arranged at the top of the push rod, and a pressing head is arranged at the top of the tongue piece;

[0007] It also includes an insulating shell, a connecting hole is opened at the top of the insulating shell, a first limiting ring and a second limiting ring are fixedly connected to one side of the inner wall of the insulating shell, a locking piece is installed on the top of the second limiting ring, and a spring is arranged on the outer wall of the rod body.

[0008] Preferably, the rod body and the contact head are cast as one body, a through hole is provided on the inner wall of the tongue piece, the push rod passes through the through hole on the tongue piece to connect with the pressing head, and a circle of tongues is provided on the outer wall of the tongue piece.

[0009] Preferably, the insulating shell is cylindrical with one end open, the rod body and the contact head are located inside the insulating shell, the bottom end of the contact head extends out of the opening at one end of the insulating shell, and a mounting hole is provided at the other end of the insulating shell, and the pressing head is penetrated and arranged in the mounting hole.

[0010] Preferably, the first limiting ring and the second limiting ring are respectively provided with adjustment holes, the contact head is slidably connected in the adjustment holes on the first limiting ring and the second limiting ring, and the spring is located between the first limiting ring and the second limiting ring.

[0011] Preferably, a hole is provided on the inner wall of the locking member, the push rod is slidably connected in the hole of the locking member, and a slot is provided on the outer wall of the locking member.

[0012] The utility model has the following beneficial effects:

[0013] The utility model cooperates with the spring, the locking piece, the push rod and the tongue piece, the rod body and the contact head are cast as one, the beryllium copper is well combined with the aluminum rod, and the conductive property is excellent, and the use of copper materials can be reduced, thereby reducing costs. The push rod is pressed to drive the tongue piece to be clamped onto the locking piece, and the bottom end of the push rod pushes the rod body and the contact head out of the insulating shell, and appropriate pressure is provided by the spring to ensure good contact between the contact head and the test point. After the test is completed, the rod body and the contact head are put into the insulating shell, thereby better protecting the contact head, reducing the risk of damage or wear, maintaining the stability and accuracy of the contact head, and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the overall structure of the current needle;

[0015] Figure 2 Schematic diagram of the internal structure of the current needle;

[0016] Figure 3 It is a schematic diagram of the structure of the locking member, the push rod, the tongue member and the pressing head;

[0017] Figure 4 Schematic diagram of the structure of the rod body and the contact head.

[0018] In the figure: 1. rod body; 2. contact head; 3. insulating shell; 4. connecting hole; 5. first limiting ring; 6. spring; 7. second limiting ring; 8. locking member; 9. push rod; 10. tongue member; 11. pressing head. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Reference Figure 1-4A current needle comprises a rod body 1 and a contact head 2, wherein the contact head 2 is arranged at the bottom of the rod body 1, a push rod 9 is installed at the top of the rod body 1, a tongue piece 10 is installed at the top of the push rod 9, and a pressing head 11 is installed at the top of the tongue piece 10;

[0021] It also includes an insulating shell 3, a connecting hole 4 is opened at the top of the insulating shell 3, a first limiting ring 5 and a second limiting ring 7 are fixedly connected to one side of the inner wall of the insulating shell 3, a locking piece 8 is installed on the top of the second limiting ring 7, and a spring 6 is arranged on the outer wall of the rod body 1.

[0022] The rod body 1 and the contact head 2 are cast as one piece to reduce looseness between components. A through hole is provided on the inner wall of the tongue piece 10. The push rod 9 passes through the through hole on the tongue piece 10 to connect to the pressing head 11. A circle of tongues is provided on the outer wall of the tongue piece 10.

[0023] The insulating shell 3 is in the shape of a cylinder with an opening at one end. The rod body 1 and the contact head 2 are located inside the insulating shell 3. The bottom end of the contact head 2 extends out of the opening at one end of the insulating shell 3, so that the contact head 2 can establish an electrical connection with other equipment. A mounting hole is opened at the other end of the insulating shell 3, and the pressing head 11 is penetrated and arranged in the mounting hole. The insulating shell 3 is made of plastic.

[0024] Adjustment holes are respectively provided on the first limit ring 5 and the second limit ring 7. The contact head 2 is slidably connected in the adjustment holes on the first limit ring 5 and the second limit ring 7. The contact head 2 moves along a specific track on the limit ring. The spring 6 is located between the first limit ring 5 and the second limit ring 7.

[0025] The inner wall of the locking member 8 is provided with a hole, and the push rod 9 is slidably connected in the hole of the locking member 8. The outer wall of the locking member 8 is provided with a slot, and the slot fixes the tongue member 10 to ensure the stability of its position and prevent accidental movement.

[0026] When using the device, first, connect the wire to the contact head 2 through the connection hole 4. Through the cooperation of the spring 6, the locking piece 8, the push rod 9 and the tongue piece 10, the rod body 1 and the contact head 2 are cast as one. The beryllium copper and the aluminum rod are well combined and have excellent conductivity. The use of copper materials can be reduced and the cost can be reduced. The push rod 9 is pressed to drive the tongue piece 10 to be snapped onto the locking piece 8. The bottom end of the push rod 9 pushes the rod body 1 and the contact head 2 out of the insulating shell 3. The spring 6 provides appropriate pressure to ensure good contact between the contact head 2 and the test point. After the test is completed, the rod body 1 and the contact head 2 are put into the insulating shell 3, so as to better protect the contact head 2, reduce the risk of damage or wear, maintain the stability and accuracy of the contact head 2, and extend its service life.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A current probe, comprising a rod body (1) and a contact head (2), characterized in that: The contact head (2) is arranged at the bottom of the rod body (1), a push rod (9) is installed at the top of the rod body (1), a tongue piece (10) is installed at the top of the push rod (9), and a pressing head (11) is installed at the top of the tongue piece (10); It also comprises an insulating shell (3), a connecting hole (4) is provided at the top of the insulating shell (3), a first limiting ring (5) and a second limiting ring (7) are fixedly connected to one side of the inner wall of the insulating shell (3), a locking member (8) is installed at the top of the second limiting ring (7), and a spring (6) is provided on the outer wall of the rod body (1).

2. A current needle according to claim 1, characterized in that: The rod body (1) and the contact head (2) are cast as one piece, the inner wall of the tongue piece (10) is provided with a through hole, the push rod (9) passes through the through hole on the tongue piece (10) to connect to the pressing head (11), and the outer wall of the tongue piece (10) is provided with a circle of tongues.

3. A current needle according to claim 2, characterized in that: The insulating shell (3) is in the shape of a cylinder with an opening at one end; the rod body (1) and the contact head (2) are located inside the insulating shell (3); the bottom end of the contact head (2) extends out of the opening at one end of the insulating shell (3); the other end of the insulating shell (3) is provided with a mounting hole, and the pressing head (11) is arranged to penetrate the mounting hole.

4. The current needle according to claim 1, characterized in that: The first limiting ring (5) and the second limiting ring (7) are respectively provided with adjustment holes, the contact head (2) is slidably connected in the adjustment holes on the first limiting ring (5) and the second limiting ring (7), and the spring (6) is located between the first limiting ring (5) and the second limiting ring (7).

5. The current needle according to claim 4, characterized in that: The inner wall of the locking member (8) is provided with a hole, the push rod (9) is slidably connected in the hole of the locking member (8), and the outer wall of the locking member (8) is provided with a slot.

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