Air cylinder test needle

Abstract

The invention discloses an air cylinder test needle, and belongs to the technical field of automobile testing, and the air cylinder test needle comprises a cylinder body which comprises a fixed part and a first sleeve which are connected, the first sleeve is internally provided with a piston cavity, the fixed part comprises a feeler lever, and the feeler lever is arranged in the piston cavity; the first connecting wire is electrically connected with the contact rod; the second connecting wire is electrically connected with the first sleeve; the piston rod is movably arranged in the piston cavity, and the piston rod can move between a first position and a second position relative to the feeler lever; the piston rod comprises an insulating part and a conductive part; the conductive part is electrically connected with the first sleeve; at the first position, the feeler lever is in contact with the insulating part; and at the second position, the feeler lever is contacted and electrically connected with the conductive part. Thus, when the piston rod is at the first position, the detection circuit in the cylinder test needle is disconnected, and when the piston rod is at the second position, the detection circuit is connected. Meanwhile, the piston rod serves as a testing needle, the air cylinder testing needle can move, the position to be detected can be detected without installing other parts, and the overall structure is simplified.

Description

Technical Field

[0001] The present application belongs to the field of automobile testing technology, and in particular relates to a cylinder testing needle. Background Art

[0002] In order to ensure the safety and normal operation of the circuit system, test needles are used in automobile testing to test short circuits. By touching the test needles to the two nodes of the circuit under test, the tester can observe the signal changes on the test needles to determine whether there is a short circuit problem.

[0003] The test needle is usually fixed inside the test fixture. The component to be tested is placed into the test fixture from above, and the test needle tests the component to be tested in the vertical direction. When the component to be tested needs to be tested in the horizontal direction, the test needle needs to be moved to extend the test needle out of the test fixture.

[0004] However, since the test needle itself cannot move, the test needle is usually installed on a separately processed block, and the block is connected to a cylinder, and the cylinder pushes the block to move, thereby driving the test needle to perform the test. In this way, the overall structure of the test needle is complicated and occupies too much space. Summary of the invention

[0005] Purpose of the invention: The present application provides a cylinder test needle, which is used to solve the problem that the existing test needle cannot move by itself and needs to install additional blocks and cylinders, resulting in a complex overall structure and occupying too much space.

[0006] Technical solution, the present application provides a cylinder test needle, including:

[0007] A cylinder body, the cylinder body comprising a fixed portion and a first sleeve connected to each other, the first sleeve having a piston cavity therein, the fixed portion comprising a feeler rod, the feeler rod being disposed in the piston cavity;

[0008] a first connecting line, the first connecting line being electrically connected to the contact rod;

[0009] a second connecting wire, the second connecting wire being electrically connected to the first sleeve;

[0010] a piston rod, the piston rod being movably disposed in the piston cavity and being movable between a first position and a second position relative to the contact rod; the piston rod comprising an insulating portion and a conductive portion, the conductive portion being electrically connected to the first sleeve;

[0011] Wherein, in the first position, the contact rod is in contact with the insulating portion;

[0012] In the second position, the contact rod contacts and is electrically connected to the conductive portion.

[0013] In some embodiments, there is also a third position, and the piston rod can move between the first position, the second position and the third position;

[0014] Wherein, in the third position, the touch rod is spaced apart from the piston rod.

[0015] In some embodiments, the conductive part has a first inner cavity, the insulating part has a second inner cavity, the insulating part is disposed in the first inner cavity and closes one end of the first inner cavity, the second inner cavity is connected to the first inner cavity; the first inner cavity is connected to the piston cavity;

[0016] When in the first position, the touch rod passes through the first inner cavity and the second inner cavity;

[0017] When in the second position, the touch rod passes through the first inner cavity.

[0018] In some embodiments, it also includes:

[0019] trachea;

[0020] The feeler rod has an air guide channel, and the air guide channel is connected to the air pipe;

[0021] The gas guide channel is used to introduce gas into the piston chamber to drive the piston rod to move.

[0022] In some embodiments, the air guide channel passes through the end of the touch rod along the moving direction of the piston rod;

[0023] In the first position, the gas guiding channel is used to introduce gas into the second inner cavity.

[0024] In some embodiments, the contact rod includes a rod body and a contact, the contact is connected to the rod body, and the outer peripheral surface of the contact has an air guide channel; the air guide channel runs through the rod body and the contact, and is connected to the air guide channel.

[0025] In some embodiments, along a direction perpendicular to the moving direction of the piston rod, the contact has a maximum dimension D1, the first inner cavity has a maximum dimension D2, and the second inner cavity has a maximum dimension D3, satisfying: D1 = D3 > D2.

[0026] In some embodiments, the fixing portion further includes a fixing seat, which is embedded in the first sleeve to close one end of the piston cavity and is connected to the touch rod.

[0027] In some embodiments, a first limiting portion is disposed on an inner wall of the first sleeve, and a second limiting portion is disposed on an outer wall of the piston rod; the first limiting portion and the second limiting portion cooperate to limit the piston rod in the piston cavity.

[0028] In some embodiments, it also includes:

[0029] A return spring is arranged in the piston cavity; the return spring has a first end and a second end, the first end is connected to the piston rod, and the second end is connected to the fixing portion.

[0030] Beneficial effect: Compared with the prior art, the cylinder test needle provided in the embodiment of the present application comprises: a cylinder body, the cylinder body comprises a fixed part and a first sleeve connected to each other, the first sleeve has a piston cavity, the fixed part comprises a touch rod, the touch rod is arranged in the piston cavity; a first connecting line, the first connecting line is electrically connected to the touch rod; a second connecting line, the second connecting line is electrically connected to the first sleeve; a piston rod, the piston rod is movably arranged in the piston cavity, and the piston rod can move between a first position and a second position relative to the touch rod; the piston rod comprises an insulating part and a conductive part, the conductive part is electrically connected to the first sleeve; wherein, in the first position, the touch rod contacts the insulating part; in the second position, the touch rod contacts and is electrically connected to the conductive part. In this way, when the piston rod is in the first position, the detection circuit inside the cylinder test needle is disconnected, and when the piston rod is in the second position, the detection circuit is turned on, thereby realizing the detection of the position to be tested. At the same time, the piston rod is used as a test needle, so that the cylinder test needle of the present application can move itself, without the need to install other components, thereby simplifying the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0032] Figure 1 A schematic diagram of the structure of a cylinder test needle provided in an embodiment of the present application;

[0033] Figure 2 A top schematic diagram of a cylinder test needle provided in an embodiment of the present application;

[0034] Figure 3 for Figure 2 Schematic diagram of the cross section of AA;

[0035] Figure 4 for Figure 3 A schematic cross-sectional view of the middle fixing portion and the contact rod;

[0036] Figure 5 A schematic structural diagram of the cylinder test needle provided in an embodiment of the present application from another perspective.

[0037] Figure markings: 100-cylinder body; 110-fixing part; 111-fixing seat; 120-first sleeve; 121-first limiting part; 130-piston chamber; 140-touch rod; 141-air guide channel; 142-rod body; 143-contact; 144-air guide channel; 200-first connecting line; 300-second connecting line; 400-piston rod; 410-insulating part; 411-second inner cavity; 420-conductive part; 421-first inner cavity; 430-second limiting part; 500-trachea; 600-reset spring; 610-first end; 620-second end. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0040] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0041] The test needle is usually fixed inside the test fixture. The component to be tested is placed into the test fixture from above, and the test needle tests the component to be tested in the vertical direction. When the component to be tested needs to be tested in the horizontal direction, the test needle needs to be moved to extend the test needle out of the test fixture.

[0042] However, the applicant found that since the test needle itself cannot move, the test needle is usually installed on a separately processed block, and the block is connected to a cylinder, and the cylinder pushes the block to move, thereby driving the test needle to perform testing. In this way, the overall structure of the test needle is complicated and occupies too much space.

[0043] In view of this, the present application embodiment provides a cylinder test needle, please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 The structural diagram of the cylinder test needle provided in the embodiment of the present application is illustrated; Figure 2 A top schematic diagram of a cylinder test needle provided in an embodiment of the present application is illustrated; Figure 3 Indicated Figure 2 Schematic cross-sectional view of AA in the figure. The cylinder test needle in the embodiment of the present application comprises: a cylinder body 100, a first connecting line 200, a second connecting line 300 and a piston rod 400. The cylinder body 100 comprises a fixed part 110 and a first sleeve 120 connected to each other, the first sleeve 120 has a piston cavity 130, the fixed part 110 comprises a touch rod 140, and the touch rod 140 is arranged in the piston cavity 130; the first connecting line 200 is electrically connected to the touch rod 140; the second connecting line 300 is electrically connected to the first sleeve 120; the piston rod 400 is movably arranged in the piston cavity 130, and the piston rod 400 can move between a first position and a second position relative to the touch rod 140; the piston rod 400 comprises an insulating part 410 and a conductive part 420, and the conductive part 420 is electrically connected to the first sleeve 120; in the first position, the touch rod 140 contacts the insulating part 410; in the second position, the touch rod 140 contacts and is electrically connected to the conductive part 420.

[0044] Specifically, the first connecting line 200, the contact rod 140, the piston rod 400, the first sleeve 120 and the second connecting line 300 are connected in sequence to form a detection circuit inside the cylinder test needle. When the piston rod 400 is in the first position, the contact rod 140 is in contact with the insulating part 410. This is the initial state, the detection circuit is disconnected, and there is no closing signal. After the detection starts, the piston rod 400 moves from the first position to the second position. When the piston rod 400 is in the second position, the conductive part 420 is electrically connected to the first sleeve 120, the detection circuit is turned on, and the position to be tested is detected, achieving the test result of the detection circuit being disconnected and then turned on. In addition, in the embodiment of the present application, the piston rod 400 is used as a test needle, so that the cylinder test needle of the present application can move itself, and detection in all directions can be performed without installing other components, thereby simplifying the overall structure.

[0045] In some embodiments, there is also a third position, and the piston rod 400 can move between the first position, the second position and the third position; wherein, in the third position, the touch rod 140 is spaced apart from the piston rod 400. After the piston rod 400 passes the second position, it continues to move toward the third position until the touch rod 140 is completely removed from the interior of the piston rod 400, the touch rod 140 is spaced apart from the piston rod 400, and the detection circuit is disconnected again. In this way, the cylinder test needle of the present application realizes the detection signal of disconnection, conduction, and disconnection of the detection circuit only by using the piston rod 400 as a test needle and the movement of the piston rod 400.

[0046] For example, the cylinder test needle of the present application is used to detect the existence of the component to be tested. If the piston rod 400 extends and touches the component to be tested, it stays in the second position, the detection circuit is turned on, and the cylinder test needle has a switch signal output; if the component to be tested is not installed or the component to be tested is not in position, the piston rod 400 is fully extended, the detection circuit is in a disconnected position, and the cylinder test needle has no switch signal output. The specific position is defined by design, and can also be fine-tuned before and after according to assembly to effectively detect the component to be tested.

[0047] In some embodiments, the conductive part 420 has a first inner cavity 421, the insulating part 410 has a second inner cavity 411, the insulating part 410 is disposed in the first inner cavity 421, and closes one end of the first inner cavity 421, the second inner cavity 411 is connected to the first inner cavity 421; the first inner cavity 421 is connected to the piston cavity 130; when in the first position, the touch rod 140 is inserted into the first inner cavity 421 and the second inner cavity 411; when in the second position, the touch rod 140 is inserted into the first inner cavity 421. In the embodiment of the present application, the movement of the piston rod 400 is completed by the push of gas, the piston cavity 130, the first inner cavity 421 and the second inner cavity 411 are connected, so that the gas can fully play a pushing role, and improve the detection speed and detection accuracy of the cylinder test needle. In addition, the piston cavity 130, the first inner cavity 421 and the second inner cavity 411 are connected, and pressure balance and fluid transmission can also be achieved, thereby ensuring the stability of the internal environment and reducing the error of the test result caused by the pressure difference.

[0048] In some embodiments, it further includes: an air pipe 500; the feeler rod 140 has an air channel 141, the air channel 141 is connected to the air pipe 500; the air channel 141 is used to introduce gas into the piston cavity 130 to drive the piston rod 400 to move. Specifically, the air pipe 500 provides a pneumatic driving method for driving the piston rod 400, and the gas is stably delivered to the piston cavity 130 through the air pipe 500 and the air channel 141, avoiding the instability or failure of the driving force of the piston rod 400 due to the uniform distribution or leakage of the gas, thereby improving the reliability of pneumatic control and the flexibility of force adjustment.

[0049] In some embodiments, the air guide channel 141 passes through the end of the feeler rod 140 along the moving direction of the piston rod 400; in the first position, the air guide channel 141 is used to introduce gas into the second inner cavity 411. Thus, in the first position, the gas is introduced into the second inner cavity 411 through the air guide channel 141, realizing the combination of the air guide channel 141 and the feeler rod 140, so as to maximize the subsequent movement of the piston rod 400.

[0050] In some embodiments, the touch rod 140 includes a rod body 142 and a contact 143, the contact 143 is connected to the rod body 142, and the outer peripheral surface of the contact 143 has an air-conducting channel 144; the air-conducting channel 144 penetrates the rod body 142 and the contact 143, and is connected to the air-conducting channel 144. In this way, even if the touch rod 140 is located at the first position or the second position, the piston cavity 130, the first inner cavity 421 and the second inner cavity 411 can still be connected, and the gas can be mutually transmitted between the piston cavity 130, the first inner cavity 421 and the second inner cavity 411 through the air-conducting channel 144 to maintain the air pressure balance inside the cylinder test needle, thereby improving the accuracy and reliability of the test.

[0051] In some embodiments, along the direction perpendicular to the moving direction of the piston rod 400, the contact 143 has a maximum dimension D1, the first inner cavity 421 has a maximum dimension D2, and the second inner cavity 411 has a maximum dimension D3, satisfying: D1 = D3 > D2. In this way, the pressure difference of the gas in the second inner cavity 411 can be increased, and the driving force and stability of the piston rod 400 can be improved. In the embodiment of the present application, the maximum dimension D1, the maximum dimension D2, and the maximum dimension D3 can be measured by measuring tools such as a vernier caliper and a micrometer.

[0052] In some embodiments, the fixing portion 110 further includes a fixing seat 111, which is embedded in the first sleeve 120 to close one end of the piston cavity and is connected to the feeler rod. In this way, the connection between the fixing seat 111 and the feeler rod 140 maintains the accurate position and stable state of the feeler rod 140 during the test, avoiding errors and unreliability caused by loosening or deviation of the feeler rod 140. In addition, the presence of the fixing seat 111 can provide additional support and fixing points for the feeler rod 140, thereby increasing the structural rigidity and stability of the entire cylinder test needle.

[0053] In some embodiments, the inner wall of the first sleeve 120 is provided with a first limiting portion 121, and the outer wall of the piston rod 400 is provided with a second limiting portion 430; the first limiting portion 121 and the second limiting portion 430 cooperate to limit the piston rod 400 in the piston chamber 130. In the embodiment of the present application, after the piston rod 400 is located at the third position, it will continue to move. In order to prevent the piston rod 400 from moving out of the inner wall of the first sleeve 120, the first limiting portion 121 and the second limiting portion 430 are provided. When the piston rod 400 reaches the limit position, the contact between the first limiting portion 121 and the second limiting portion 430 will provide additional support and fixation, ensuring that the piston rod 400 remains in the correct position in the first sleeve 120, so as to achieve precise motion control and measurement.

[0054] In some embodiments, the return spring 600 is further included. The return spring 600 is disposed in the piston cavity 130. The return spring 600 has a first end 610 and a second end 620. The first end 610 is connected to the piston rod 400, and the second end 620 is connected to the fixing portion 110. Specifically, the return spring 600 provides a restoring force for the cylinder test needle, so that the piston rod 400 can quickly return to the initial position after the test is completed. At the same time, the return spring 600 can also reduce the vibration of the piston rod 400 during the movement process, and increase the stability and smoothness of the test.

[0055] Compared with the prior art, the cylinder test needle provided in the embodiment of the present application includes: a cylinder body 100, a first connecting line 200, a second connecting line 300 and a piston rod 400. The cylinder body 100 includes a fixed part 110 and a first sleeve 120 connected to each other, the first sleeve 120 has a piston cavity 130, the fixed part 110 includes a touch rod 140, and the touch rod 140 is arranged in the piston cavity 130; the first connecting line 200 is electrically connected to the touch rod 140; the second connecting line 300 is electrically connected to the first sleeve 120; the piston rod 400 is movably arranged in the piston cavity 130, and the piston rod 400 can move between a first position and a second position relative to the touch rod 140; the piston rod 400 includes an insulating part 410 and a conductive part 420, and the conductive part 420 is electrically connected to the first sleeve 120; wherein, in the first position, the touch rod 140 contacts the insulating part 410; in the second position, the touch rod 140 contacts and is electrically connected to the conductive part 420. In this way, when the piston rod 400 is in the first position, the detection circuit inside the cylinder test needle is disconnected, and when the piston rod 400 is in the second position, the detection circuit is turned on, thereby realizing the detection of the position to be tested. At the same time, the piston rod is used as a test needle, so that the cylinder test needle of the present application can move itself without installing other components, thus simplifying the overall structure and saving the production time and cost of the cylinder test needle.

[0056] The above is a detailed introduction to a cylinder test needle provided in an embodiment of the present application. Specific examples are used in the present application to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A cylinder test needle, characterized in that: include: A cylinder body (100), the cylinder body (100) comprising a fixed portion (110) and a first sleeve (120) connected to each other, the first sleeve (120) having a piston chamber (130) therein, the fixed portion (110) comprising a feeler rod (140), the feeler rod (140) being disposed in the piston chamber (130); A first connecting line (200), the first connecting line (200) being electrically connected to the contact rod (140); A second connecting wire (300), the second connecting wire (300) being electrically connected to the first sleeve (120); A piston rod (400), wherein the piston rod (400) is movably disposed in the piston chamber (130), and the piston rod (400) is movable between a first position and a second position relative to the contact rod (140); the piston rod (400) comprises an insulating portion (410) and a conductive portion (420), and the conductive portion (420) is electrically connected to the first sleeve (120); Wherein, in the first position, the contact rod (140) is in contact with the insulating portion (410); In the second position, the contact rod (140) contacts and is electrically connected to the conductive portion (420).

2. The cylinder test needle according to claim 1, characterized in that: Also having a third position, the piston rod (400) is movable between the first position, the second position and the third position; Wherein, in the third position, the touch rod (140) is spaced apart from the piston rod (400).

3. The cylinder test needle according to claim 1, characterized in that: The conductive part (420) has a first inner cavity (421), the insulating part (410) has a second inner cavity (411), the insulating part (410) is arranged in the first inner cavity (421) and closes one end of the first inner cavity (421), the second inner cavity (411) is connected to the first inner cavity (421); the first inner cavity (421) is connected to the piston cavity (130); When in the first position, the touch rod (140) passes through the first inner cavity (421) and the second inner cavity (411); When in the second position, the touch rod (140) passes through the first inner cavity (421).

4. The cylinder test needle according to claim 3, characterized in that: Also includes: Trachea (500); The touch rod (140) has an air guide channel (141), and the air guide channel (141) is connected to the air pipe (500); The gas guide channel (141) is used to introduce gas into the piston chamber (130) to drive the piston rod (400) to move.

5. The cylinder test needle according to claim 4, characterized in that: The air guide channel (141) penetrates the end of the contact rod (140) along the moving direction of the piston rod (400); In the first position, the gas guiding channel (141) is used to introduce gas into the second inner cavity (411).

6. The cylinder test needle according to claim 4, characterized in that: The contact rod (140) comprises a rod body (142) and a contact (143); the contact (143) is connected to the rod body (142); the outer peripheral surface of the contact (143) has an air guide channel (144); the air guide channel (141) passes through the rod body (142) and the contact (143), and is connected to the air guide channel (144).

7. The cylinder test needle according to claim 6, characterized in that: Along a direction perpendicular to the moving direction of the piston rod (400), the contact (143) has a maximum dimension D1, the first inner cavity (421) has a maximum dimension D2, and the second inner cavity (411) has a maximum dimension D3, satisfying: D1=D3>D2.

8. The cylinder test needle according to claim 1, characterized in that: The fixing portion (110) further comprises a fixing seat (111), wherein the fixing seat (111) is embedded in the first sleeve (120) to close one end of the piston cavity (130) and is connected to the touch rod (140).

9. The cylinder test needle according to claim 8, characterized in that: The inner wall of the first sleeve (120) is provided with a first limiting portion (121), and the outer wall of the piston rod (400) is provided with a second limiting portion (430); the first limiting portion (121) and the second limiting portion (430) cooperate to limit the piston rod (400) in the piston cavity (130).

10. The cylinder test needle according to claim 8, characterized in that: Also includes: A return spring (600), wherein the return spring (600) is disposed in the piston chamber (130); the return spring (600) has a first end (610) and a second end (620), wherein the first end (610) is connected to the piston rod (400), and the second end (620) is connected to the fixing portion (110).

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