Spring type probe structure based on pressure balance diaphragm

Abstract

The invention relates to the technical field of spring type probes, and discloses a spring type probe structure based on a pressure balance diaphragm, which comprises a hollow needle tube, a needle head axially moving along the interior of the needle tube is mounted in the needle tube, an auxiliary mechanism is arranged at the tail end of the needle head, and a protection mechanism and a limiting mechanism are arranged on the outer wall of the needle tube. The needle head is detachably connected with the needle tube, a quick-release piece is further arranged on the side, away from the needle head, of the needle tube, the auxiliary mechanism comprises a connecting cover cap which slides axially along the inner wall of the needle tube all the time, and a balance diaphragm which is tightly attached to the tail of the needle head all the time and used for cushioning the needle head is installed between the connecting cover cap and the needle head. And the connecting cover is sleeved on a conical spring which is fixedly connected with the inner wall of the needle tube. The spring type probe structure can effectively solve the problem that the performance and the service life of the spring type probe are affected by poor contact or incapability of normal use caused by damage and deformation of the probe head due to bearing of overlarge pressure under the condition of high pressure or long-time contact with a measured object.

Description

Technical Field

[0001] The present invention relates to the technical field of spring-type probes, and in particular to a spring-type probe structure based on a pressure-balancing diaphragm. Background Art

[0002] Spring-loaded probes, also known as Pogo Pins, are precision components widely used in electronic testing, charging connections, data transmission, and other fields. Their core structure consists of a needle, a sleeve, and a spring. The compression and release of the spring achieve stable contact between the probe and the object being tested or the connector.

[0003] To ensure stable contact between the probe and the object being measured or the connector, the needle and the sleeve usually use a clearance fit and are made of relatively high-quality materials and precise size design. However, it is worth noting that in actual use, the detection position of the probe and the object being measured needs to be constantly changed, and different degrees of downward pressure need to be applied. Under high pressure or long-term contact, the needle may be damaged and deformed due to excessive pressure, resulting in poor contact or malfunction, which in turn affects the performance and service life of the spring-loaded probe. Summary of the Invention

[0004] In response to the above-mentioned shortcomings of the prior art, the present invention provides a spring-type probe structure based on a pressure-balancing diaphragm, which can effectively solve the problem in the prior art that the needle tip is damaged and deformed due to excessive pressure under high pressure or long-term contact, resulting in poor contact or inability to use normally, affecting the performance and service life of the spring-type probe.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a spring-type probe structure based on a pressure-balancing diaphragm, comprising: a hollow needle tube, a needle head that moves along its axial direction is installed inside the needle tube, and an auxiliary mechanism is provided at the tail end of the needle head and inside the needle tube; The outer wall of the needle tube is provided with two square grooves symmetrically along its center. The square grooves are provided with a protection mechanism to prevent the needle from over-pressure. The needle and the needle tube are detachably connected. The outer wall of the needle tube close to the needle is provided with a limit mechanism for limiting the radial movement of the needle, and the side of the needle tube away from the needle is also provided with a quick release member. The top of the needle is provided with a mounting groove along the circumferential direction, and the side wall of the mounting groove is provided with four inverted T-shaped grooves extending in the axial direction. The end surface of the tail end of the needle is provided with a bowl shape, and the outer wall of the tail end of the needle is provided with two matching grooves; The auxiliary mechanism includes a connecting cover that always slides axially along the inner wall of the needle tube, and a balancing diaphragm is installed between the connecting cover and the needle, which is always in close contact with the tail of the needle and is used for needle buffering; The balancing diaphragm is arranged in a ring shape, and a bowl-shaped annular groove is provided on the end surface of the balancing diaphragm along its circumferential direction, and the annular groove is provided at one end close to the tail of the needle head.

[0006] Furthermore, the limiting mechanism includes four inverted L-shaped rods arranged corresponding to the inverted T-shaped slots, one end of the four inverted L-shaped rods is respectively fixed with a T-shaped block placed inside the mounting slot, and the other ends of the four inverted L-shaped rods are commonly connected to an adjustment component that controls the four inverted L-shaped rods to move closer or farther away synchronously.

[0007] Furthermore, the protective mechanism includes a rectangular block that slides through the square slot, a connecting plate that is fixedly provided on the side of the rectangular block away from the square slot and connected to the square slot through a spring, a pressing plate that is fixedly provided on the upper end face of the connecting plate, and a lower end face of the pressing plate that is fixedly connected to the square slot through a spring, and a protrusion whose upper end face is always in close contact with the pressing plate that is fixedly provided on the lower end face of the pressing plate and located inside the square slot.

[0008] Furthermore, a connecting hemisphere is fixedly provided on the top of the connecting cover, which passes through the balancing diaphragm and is in contact with the tail end of the needle. An annular ring is fixedly provided in the annular groove corresponding to the end of the needle close to the balancing diaphragm. The annular ring is always located inside the annular groove, ensuring that when the needle is under pressure, the pressure can be transmitted to the balancing diaphragm through the annular ring, thereby reducing the pressure on the needle.

[0009] Furthermore, the adjustment assembly includes an annular adjustment plate threadedly connected to the outer wall of the needle tube, and the annular mounting plate is provided with arc grooves corresponding to the four inverted L-shaped rods. The four inverted L-shaped rods pass through the corresponding arc grooves and are connected to the annular mounting plate fixedly connected to the outer wall of the needle tube.

[0010] Furthermore, four strip-shaped sliding grooves are provided on the end surface of the annular mounting plate along the circumferential direction, and sliding blocks are slidably provided inside the four strip-shaped sliding grooves. The four sliding blocks are fixedly connected to corresponding inverted L-shaped rods respectively.

[0011] Furthermore, the quick-release part includes a mating shaft fixedly arranged on the end face of the needle tube, and two arc-shaped bosses symmetrical about the center of the mating shaft are fixedly arranged on the outer wall of the mating shaft, and telescopic top blocks are fixedly installed inside the two arc-shaped bosses. The outer wall of the needle tube is also fitted with a mounting sleeve connected to the external detection equipment.

[0012] Furthermore, the mounting sleeve is provided with waist-shaped grooves corresponding to the two arc-shaped bosses, and an annular slide groove is provided at the bottom end of the waist-shaped groove and inside the mounting sleeve. The inner wall of the annular slide groove is also provided with two rectangular grooves that are staggered with the positions of the arc-shaped bosses. The outer wall of the mounting sleeve is also fixed with a pressing rod through a spring telescopic rod, and one end of the pressing rod slides through the mounting sleeve and is located inside the rectangular groove.

[0013] Furthermore, a conical spring is fixedly installed inside the needle tube, and a connecting cover is sleeved on the end of the conical spring with a smaller diameter. By balancing the synchronous action of the diaphragm and the conical spring, the impact on the needle during use is reduced, thereby extending the service life of the needle.

[0014] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is provided with a pressure diaphragm with a certain elasticity, which transmits the pressure of the needle to the pressure diaphragm through the annular ring, thereby reducing the pressure on the needle during operation. When the needle is subjected to a large pressure shock, the rectangular block quickly pops out and gets stuck in the needle, making it impossible for the needle to rebound and reset, thereby avoiding secondary damage. Four T-shaped blocks are used to hold and limit the position, thereby always ensuring that the needle and the needle tube are concentric and coaxial, ensuring the stability of the probe's operation. At the same time, the designed quick disassembly and assembly mechanism of the needle and the needle tube can effectively reduce the time required to replace parts of the probe during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0016] Figure 1 Schematic diagram of the three-dimensional structure of the probe in an embodiment of the present invention; Figure 2 Schematic diagram of the explosion structure of the probe in an embodiment of the present invention; Figure 3 Schematic diagram of the structural change of the limiting mechanism in an embodiment of the present invention; Figure 4 For the embodiment of the present invention Figure 3 A schematic diagram of the partially enlarged structure at point A in the middle; Figure 5 A schematic diagram of a portion of the structure of the auxiliary mechanism in an embodiment of the present invention; Figure 6 Schematic diagram of the three-dimensional structure of the quick release component in an embodiment of the present invention; Figure 7 Schematic diagram of the cross-section structure of the installation sleeve in an embodiment of the present invention; Figure 8 This is a schematic diagram of a half-section planar structure of a needle tube in an embodiment of the present invention; Figure 9 For the embodiment of the present invention Figure 8 A schematic diagram of the structure with a partial enlargement at point B in the middle; Figure 10Schematic diagram of the three-dimensional structure of the balancing diaphragm in an embodiment of the present invention; The numbers in the figure represent: 1-needle tube; 11-square groove; 12-quick release; 121-matching shaft; 1211-arc-shaped boss; 1212-telescopic top block; 122-mounting sleeve; 1221-waist-shaped groove; 1222-annular slide; 1223-rectangular groove; 1224-pressing rod; 2-needle; 21-mounting groove; 211-inverted T-shaped groove; 22-matching groove; 3-auxiliary mechanism; 31-connecting cover; 311-connecting hemisphere; 32-balancing diaphragm; 321-annular groove; 4-protective mechanism; 41-rectangular block; 42-pressing plate; 43-bump; 5-limiting mechanism; 51-inverted L-shaped rod; 52-T-shaped block; 53-adjusting assembly; 531-annular adjustment plate; 532-arc-shaped groove; 533-annular mounting plate; 534-strip slide; 6-conical spring. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] The present invention will be further described below with reference to the embodiments. Example

[0019] See also Figures 1-10 The present invention provides a technical solution: a spring-type probe structure based on a pressure-balanced diaphragm, comprising: A hollow needle tube 1 is provided with a needle head 2 which moves along its axial direction. An auxiliary mechanism 3 is provided at the tail end of the needle head 2 and inside the needle tube 1. The outer wall of the needle tube 1 is provided with two square grooves 11 symmetrically along its center. A protection mechanism 4 is provided in the square groove 11 to prevent overpressure on the needle 2. The needle 2 and the needle tube 1 are detachably connected. A limit mechanism 5 is provided on the outer wall of the needle tube 1 on the side close to the needle 2 to limit the radial movement of the needle 2, and a quick release member 12 is also provided on the side of the needle tube 1 away from the needle 2. The top of the needle 2 is provided with a mounting groove 21 along the circumferential direction, and the side wall of the mounting groove 21 is provided with four inverted T-shaped grooves 211 extending along the axial direction. The tail end surface of the needle 2 is provided with a bowl shape, and the outer wall of the tail end of the needle 2 is provided with two matching grooves 22; The auxiliary mechanism 3 includes a connecting cover 31 that always slides axially along the inner wall of the needle tube 1. A balancing diaphragm 32 is installed between the connecting cover 31 and the needle 2, which is always in close contact with the tail of the needle 2 and is used to cushion the vibration of the needle 2. The balancing diaphragm 32 is annular in shape, and a bowl-shaped annular groove 321 is formed on the end surface of the balancing diaphragm 32 along its circumferential direction. The annular groove 321 is formed at one end close to the tail of the needle 2 .

[0020] The limiting mechanism 5 includes four inverted L-shaped rods 51 arranged corresponding to the inverted T-shaped grooves 211, and one end of the four inverted L-shaped rods 51 is fixed with a T-shaped block 52 placed inside the mounting groove 21, and the other end of the four inverted L-shaped rods 51 is commonly connected to an adjustment component 53 that controls the four inverted L-shaped rods 51 to move closer or farther away synchronously.

[0021] The protection mechanism 4 includes a rectangular block 41 that slides through the square groove 11. A connecting plate connected to the square groove 11 through a spring is fixedly provided on the side of the rectangular block 41 away from the square groove 11. A pressing plate 42 is fixedly provided on the upper end face of the connecting plate. The lower end face of the pressing plate 42 is fixedly connected to the square groove 11 through a spring. A protrusion 43 whose upper end face is always in close contact with the pressing plate 42 is fixedly provided on the lower end face of the pressing plate 42 and is located inside the square groove 11.

[0022] A connecting hemisphere 311 is fixedly provided on the top of the connecting cover 31, which passes through the balancing diaphragm 32 and is in contact with the tail end of the needle 2. An annular ring is fixedly provided on the end of the needle 2 close to the balancing diaphragm 32 corresponding to the annular groove 321. The annular ring is always located inside the annular groove 321, ensuring that when the needle 2 is under pressure, the pressure can be transmitted to the balancing diaphragm 32 through the annular ring, thereby reducing the pressure on the needle 2.

[0023] The adjustment assembly 53 includes an annular adjustment plate 531 threadedly connected to the outer wall of the needle tube 1. The annular mounting plate 533 is provided with arc grooves 532 corresponding to the four inverted L-shaped rods 51. The four inverted L-shaped rods 51 pass through the corresponding arc grooves 532 and are connected to the annular mounting plate 533 fixedly connected to the outer wall of the needle tube 1.

[0024] Four strip-shaped sliding grooves 534 are provided on the end surface of the annular mounting plate 533 along the circumferential direction. Sliding blocks are slidably provided inside the four strip-shaped sliding grooves 534 . The four sliding blocks are fixedly connected to corresponding inverted L-shaped rods 51 .

[0025] The quick-release part 12 includes a mating shaft 121 fixedly arranged on the end face of the needle tube 1. The outer wall of the mating shaft 121 is fixedly provided with two arc-shaped bosses 1211 symmetrical about the center of the mating shaft 121. The interiors of the two arc-shaped bosses 1211 are fixedly installed with telescopic top blocks 1212. The outer wall of the needle tube 1 is also fitted with a mounting sleeve 122 connected to an external detection device.

[0026] The mounting sleeve 122 is provided with a waist-shaped groove 1221 corresponding to the two arc-shaped bosses 1211, and an annular slide groove 1222 is provided at the bottom end of the waist-shaped groove 1221 and located inside the mounting sleeve 122. The inner wall of the annular slide groove 1222 is also provided with two rectangular grooves 1223 that are staggered with the positions of the arc-shaped bosses 1211. The outer wall of the mounting sleeve 122 is also fixed with a pressing rod 1224 through a spring telescopic rod. One end of the pressing rod 1224 slides through the mounting sleeve 122 and is located inside the rectangular groove 1223.

[0027] A conical spring 6 is also fixedly installed inside the needle tube 1, and the connecting cover 31 is mounted on the end with a smaller diameter of the conical spring 6. By balancing the synchronous action of the diaphragm 32 and the conical spring 6, the impact on the needle 2 during use is reduced, thereby extending the service life of the needle 2.

[0028] refer to Figures 1-10 In actual use, the detection position of the probe and the object to be measured needs to be constantly changed, and different degrees of downward pressure need to be applied at the same time. Under high pressure or long-term contact, the needle 2 may be damaged and deformed due to excessive pressure, resulting in poor contact or malfunction, which in turn affects the performance and service life of the spring-loaded probe. In order to overcome the above-mentioned defects, the present application designs a spring-type probe structure based on a pressure-balancing diaphragm 32, which can not only reduce the pressure exerted on the probe during use and reduce the friction with the needle tube 1, but also protect the needle 2 and prevent it from suffering secondary damage, thereby improving the working performance of the probe and extending the service life of the probe.

[0029] Installation of needle tube 1 and needle 2: Initially, the mounting sleeve 122 is first connected to the external detection equipment, and then the matching shaft 121 on the needle tube 1 is slid into the waist-shaped groove 1221 opened on the mounting sleeve 122. At this time, the two telescopic top blocks 1212 on the arc-shaped boss 1211 retract under the push of the inner wall of the waist-shaped groove 1221, and the needle tube 1 is controlled to continue to slide along the waist-shaped groove 1221 into the annular groove 1222 and then the needle tube 1 is rotated. When the two arc-shaped bosses 1211 on the needle tube 1 rotate to the corresponding rectangular groove 1223, the telescopic top block 1212 is quickly popped out by the elastic force of the spring and is stuck in the corresponding rectangular groove 1223, thereby completing the connection between the mounting sleeve 122 and the needle tube 1.

[0030] After the needle tube 1 is installed, the needle 2 is inserted into the hollow needle tube 1, and the tail end of the needle 2 is tightly attached to the connecting hemisphere 311. At the same time, the annular ring is also attached to the annular groove 321 on the balance diaphragm 32. After the preparation work is completed, the annular adjustment plate 531 is controlled to rotate. At this time, the four inverted L-shaped rods 51 and the T-shaped blocks 52 and the sliding blocks slide along their respective strip grooves 534 driven by the corresponding arc grooves 532, and move synchronously to the installation groove 21 of the needle 2. The needle 2 is locked and limited by the synchronous approach of the four T-shaped blocks 52, and the installation of the needle tube 1 and the needle 2 is completed.

[0031] The cushioning process of needle 2 when working: After completing the installation of the needle tube 1 and the needle 2, the detection equipment is controlled to drive the probe to move downward and contact the object to be measured. At this time, the needle 2 is compressed and a small amount of pressure is transmitted to the balance diaphragm 32 through the annular ring, and most of the remaining pressure will be transmitted to the conical spring 6 through the connecting hemisphere 311. As the conical spring 6 is compressed, the pressure on the needle 2 is further reduced, thereby realizing the shock absorption work of the needle 2 during operation.

[0032] It is worth noting that the balancing diaphragm 32 has a certain elastic force to help the needle 2 share the pressure. At the same time, the balancing diaphragm 32 is made of insulating material and is gap-matched with the inner wall of the needle tube 1.

[0033] Overload protection when needle 2 is under too much pressure: When the detection device drives the probe continuously downward, the needle 2 continuously pushes the connecting cover 31 to slide along the inner wall of the needle tube 1. When the pressure is too large, the two matching grooves 22 at the tail end of the needle 2 will move between the two rectangular blocks 41. The two rectangular blocks 41 are quickly popped out by the force of the spring and the rectangular blocks 41 are stuck in the corresponding matching grooves 22, thereby making the needle 2 unable to reset. At this time, the conical spring 6 is in a compressed state.

[0034] When it is found that the detection work cannot be continued manually, the pressing plate 42 on the outer wall of the needle tube 1 is pressed synchronously. At this time, the pressing plate 42 and the protrusion 43 inside the mounting groove 21 cooperate to form a lever and gradually pry the rectangular block 41, thereby causing the rectangular block 41 to gradually disengage from the matching groove 22. When the rectangular block 41 is completely disengaged from the matching groove 22, the conical spring 6 quickly returns to its initial state, thereby completing the needle 2 reset work.

[0035] Replacement of needle tube 1 or needle 2: When the needle 2 is found to be damaged and needs to be replaced during operation, first wait for the needle 2 to be reset to its initial position, then control the annular adjustment plate 531 to reverse. At this time, the T-shaped block 52 and the inverted L-shaped rod 51 are synchronously moved away from the mounting groove 21 on the needle 2 under the drive of the arc groove 532. After the four T-shaped blocks 52 are no longer limited, the needle 2 is pulled out, and then the above installation steps are repeated to replace the new needle 2.

[0036] When the elastic force of the conical spring 6 weakens, the pressing rods 1224 on both sides of the installation sleeve 122 can be pressed synchronously. At this time, the two pressing rods 1224 approach each other synchronously and slide along the rectangular groove 1223, and push the corresponding telescopic top block 1212. After the two telescopic top blocks 1212 are pushed, the needle tube 1 is rotated to complete the separation of the telescopic top block 1212 and the rectangular groove 1223. Then continue to rotate the needle tube 1 and slide it out along the waist-shaped groove 1221. Repeat the above installation steps to replace the new needle tube 1.

[0037] The auxiliary mechanism 3, the limiting mechanism 5 and the protective mechanism 4 described above have the following advantages: Advantage 1: A pressure diaphragm with a certain elasticity is installed inside the needle tube 1. The annular groove 321 on the pressure diaphragm and the tight fit between the annular ring allow part of the pressure of the needle 2 to be transmitted to the pressure diaphragm through the annular ring when the needle 2 is pressed down, thereby reducing the pressure on the needle 2 during operation and avoiding damage to the needle 2 caused by excessive pressure.

[0038] Advantage 2: When the needle 2 is subjected to a large pressure shock, the rectangular block 41 inside the square groove 11 quickly pops out and snaps into the corresponding matching groove 22 of the needle 2, making it impossible for the conical spring 6 and the needle 2 to rebound and reset, thereby avoiding secondary damage to the needle 2 during actual use.

[0039] Advantage three: in order to ensure stable contact between the needle 2 and the needle tube 1, a clearance fit method is usually adopted. The four T-shaped blocks 52 are brought close to each other synchronously, which not only realizes the engagement and limiting of the needle 2, but also ensures the relative position of the needle 2 and the needle tube 1 through the four T-shaped blocks 52, that is, the needle 2 and the needle tube 1 are concentric and coaxial, thereby ensuring the stability of the probe operation.

[0040] Advantage four: through the synchronous pressing of the two pressing plates 42 and the rotation of the needle tube 1, the needle tube 1 and the mounting sleeve 122 can be quickly assembled and disassembled. At the same time, the annular adjustment plate 531 can be rotated to complete the locking and disassembly of the needle 2. The use of the needle tube 1 and the needle 2 quick assembly and disassembly mechanism can greatly reduce the time spent on the probe during the installation process. At the same time, different parts can be replaced according to different needs, which can slightly reduce costs.

[0041] Advantage five: the interior of the needle tube 1 is connected to the connecting cover 31 by a conical spring 6. Thanks to the large centripetal force of the conical spring 6, the stability of the connecting cover 31 can be ensured. At the same time, the conical spring 6 also has good shock absorption and buffering functions, and cooperates with the balance diaphragm 32 to further reduce the pressure from the needle 2.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A spring-type probe structure based on a pressure-balancing diaphragm (32), characterized in that: include: A hollow needle tube (1), wherein a needle head (2) is installed inside the needle tube (1) and moves along its axial direction, and an auxiliary mechanism (3) is provided at the rear end of the needle head (2) and inside the needle tube (1); The outer wall of the needle tube (1) is provided with two square grooves (11) symmetrically arranged along its center, and a protection mechanism (4) for preventing the needle (2) from being over-pressurized is provided in the square groove (11). The needle (2) and the needle tube (1) are detachably connected, and a limiting mechanism (5) for limiting the radial movement of the needle (2) is provided on the outer wall of the needle tube (1) on the side close to the needle (2), and a quick-release member (12) is also provided on the side of the needle tube (1) away from the needle (2); The top end of the needle (2) is provided with a mounting groove (21) along the circumferential direction, and the side wall of the mounting groove (21) is provided with four inverted T-shaped grooves (211) extending along the axial direction. The tail end surface of the needle (2) is provided in a bowl shape, and the outer wall of the tail end of the needle (2) is provided with two matching grooves (22); The auxiliary mechanism (3) includes a connecting cover (31) that always slides axially along the inner wall of the needle tube (1), and a balancing diaphragm (32) that always clings to the tail of the needle (2) and is used to cushion the vibration of the needle (2) is installed between the connecting cover (31) and the needle (2); The balancing diaphragm (32) is arranged in an annular shape, and a bowl-shaped annular groove (321) is provided on the end surface of the balancing diaphragm (32) along its circumferential direction. The annular groove (321) is provided at one end close to the tail of the needle (2).

2. A spring-type probe structure based on a pressure-balancing diaphragm (32) according to claim 1, characterized in that: The limiting mechanism (5) comprises four inverted L-shaped rods (51) arranged corresponding to the inverted T-shaped grooves (211), one end of each of the four inverted L-shaped rods (51) being fixedly provided with a T-shaped block (52) disposed inside the mounting groove (21), and the other ends of the four inverted L-shaped rods (51) being commonly connected to an adjusting assembly (53) for controlling the four inverted L-shaped rods (51) to synchronously move closer or farther away.

3. The spring-type probe structure based on the pressure-balancing diaphragm (32) according to claim 1, characterized in that: The protection mechanism (4) comprises a rectangular block (41) that slides through the square groove (11); a connecting plate connected to the square groove (11) via a spring is fixedly provided on the side of the rectangular block (41) away from the square groove (11); a pressing plate (42) is fixedly provided on the upper end surface of the connecting plate; the lower end surface of the pressing plate (42) is fixedly connected to the square groove (11) via a spring; a convex block (43) whose upper end surface is always in close contact with the pressing plate (42) is fixedly provided on the lower end surface of the pressing plate (42) and is located inside the square groove (11).

4. The spring-type probe structure based on the pressure-balancing diaphragm (32) according to claim 1, characterized in that: A connecting hemisphere (311) is fixedly provided on the top of the connecting cover (31) and passes through the balancing diaphragm (32) and is in contact with the tail end of the needle (2). An annular ring is fixedly provided on the end of the needle (2) close to the balancing diaphragm (32) corresponding to the annular groove (321). The annular ring is always located inside the annular groove (321), ensuring that when the needle (2) is under pressure, the pressure can be transmitted to the balancing diaphragm (32) through the annular ring, thereby reducing the pressure on the needle (2).

5. The spring-type probe structure based on the pressure-balancing diaphragm (32) according to claim 1, characterized in that: The adjustment assembly (53) comprises an annular adjustment plate (531) threadedly connected to the outer wall of the needle tube (1); the annular mounting plate (533) is provided with arcuate grooves (532) corresponding to the four inverted L-shaped rods (51); the four inverted L-shaped rods (51) pass through the corresponding arcuate grooves (532) and are connected to the annular mounting plate (533) fixedly connected to the outer wall of the needle tube (1).

6. A spring-type probe structure based on a pressure-balancing diaphragm (32) according to claim 5, characterized in that: The end surface of the annular mounting plate (533) is provided with four strip-shaped sliding grooves (534) along the circumferential direction. Sliding blocks are slidably provided inside the four strip-shaped sliding grooves (534). The four sliding blocks are respectively fixedly connected to corresponding inverted L-shaped rods (51).

7. The spring-type probe structure based on a pressure-balancing diaphragm (32) according to claim 1, characterized in that: The quick-release component (12) includes a matching shaft (121) fixedly mounted on the end face of the needle tube (1); the outer wall of the matching shaft (121) is fixedly mounted with two arc-shaped bosses (1211) symmetrical about the center of the matching shaft (121); a telescopic top block (1212) is fixedly mounted inside the two arc-shaped bosses (1211); and a mounting sleeve (122) connected to an external detection device is also mounted on the outer wall of the needle tube (1).

8. A spring-type probe structure based on a pressure-balancing diaphragm (32) according to claim 7, characterized in that: The mounting sleeve (122) is provided with a waist-shaped groove (1221) corresponding to the two arc-shaped bosses (1211); an annular slide groove (1222) is provided at the bottom end of the waist-shaped groove (1221) and located inside the mounting sleeve (122); the inner wall of the annular slide groove (1222) is further provided with two rectangular grooves (1223) that are staggered with the positions of the arc-shaped bosses (1211); the outer wall of the mounting sleeve (122) is further provided with a pressing rod (1224) fixed by a spring telescopic rod; one end of the pressing rod (1224) slides through the mounting sleeve (122) and is located inside the rectangular groove (1223).

9. The spring-type probe structure based on a pressure-balancing diaphragm (32) according to claim 1, characterized in that: A conical spring (6) is also fixedly mounted inside the needle tube (1), and the connecting cover (31) is sleeved on the end of the conical spring (6) with a smaller diameter. By synchronizing the balancing diaphragm (32) and the conical spring (6), the impact on the needle (2) during use is reduced, thereby extending the service life of the needle (2).

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