Pressure sensor inspection machine

Abstract

The utility model provides a pressure sensor inspection machine, comprising a cylinder having a telescopic end; the ventilation block is fixed to the telescopic end, a gas channel is formed in the ventilation block, an inlet and an outlet of the gas channel are formed in the surface of the ventilation block, and the outlet of the gas channel is located in the surface, away from the telescopic end, of the ventilation block; the sealing ring is arranged at an outlet of the gas channel; and the springback supporting column is telescopically connected to the side, away from the telescopic end, of the ventilation block, and the telescopic direction of the springback supporting column is the same as that of the telescopic end. When the air cylinder moves towards the direction of the pressure sensor to be tested, the springback supporting column is in a compressed state between the ventilation block and the pressure sensor to be tested. When the air cylinder moves in the direction away from the to-be-tested pressure sensor, the to-be-tested pressure sensor and the sealing ring are separated under the action of the elastic restoring force. By adding the springback pillar, the situation that the pressure sensor cannot be separated along with movement of the air cylinder after detection is completed can be prevented, and the reject ratio of products can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, and specifically relates to a pressure sensor inspection machine. Background Art

[0002] A pressure sensor inspection machine is a machine used to detect the performance of a pressure sensor. The pressure sensor inspection machine includes a cylinder, a ventilation block, and a sealing ring connected in sequence. The ventilation block reciprocates under the drive of the cylinder, and the sealing ring is arranged at the air outlet of the ventilation block. During pressure detection, the telescopic end of the cylinder extends, the gas introduced into the ventilation block enters the pressure head, and the sealing ring is close to the pressure head to prevent gas leakage during the inflation process. After the pressure detection is completed, when the telescopic end of the cylinder retracts, it is easy to carry the pressure sensor and move it together, resulting in secondary crushing of the pressure sensor, and the defective rate of the pressure sensor is relatively high. Content of the Utility Model

[0003] In view of the above problems, the utility model provides a pressure sensor inspection machine, including:

[0004] A cylinder having a telescopic end;

[0005] A ventilation block fixed to the telescopic end, with a gas passage formed inside the ventilation block. The inlet and outlet of the gas passage are respectively formed on the surface of the ventilation block, and the outlet of the gas passage is located on the surface of the ventilation block facing away from the telescopic end;

[0006] A sealing ring arranged at the outlet of the gas passage;

[0007] A rebound strut telescopically connected to the side of the ventilation block facing away from the telescopic end, and the telescopic direction of the rebound strut is the same as the telescopic direction of the telescopic end.

[0008] According to this technical solution, when the telescopic end of the cylinder and the ventilation block move towards the direction close to the pressure sensor to be tested, and the rebound strut abuts against the pressure sensor, the elastic member (such as a spring) of the rebound strut is in a compressed state; when the telescopic end of the cylinder moves away from the pressure sensor to be tested, the rebound strut generates an elastic restoring force acting on the pressure sensor to be tested and opposite to the movement direction of the cylinder due to the deformation of the elastic member (spring), and the pressure sensor to be tested and the sealing ring are separated under the action of the elastic restoring force. By adding the rebound strut, it is possible to prevent the pressure sensor from moving together with the sealing ring along with the cylinder after the detection is completed, causing secondary crushing of the pressure sensor, thereby helping to reduce the defective rate of the product.

[0009] In an alternative technical solution of the utility model, a first groove portion and a second groove portion that are connected in the telescopic direction are provided inside the ventilation block. The first groove portion is closer to the telescopic end than the second groove portion, and the inner diameter of the first groove portion is larger than the inner diameter of the second groove portion;

[0010] The resilient strut includes:

[0011] A spring, disposed in the first groove portion and fixed to the telescopic end;

[0012] A strut, including a head and a rod portion connected along the telescopic direction, the head is fitted in the first groove portion and fixed to the spring, the rod portion is fitted in the second groove portion, and one end of the rod portion away from the head can extend out of the second groove portion.

[0013] According to this technical solution, the structure of the resilient strut is simple and easy to obtain. The connection method between the resilient strut and the vent block is simple and easy to process and manufacture, which is beneficial to cost savings.

[0014] In an alternative technical solution of the present utility model, it further includes: an elastic cushion block, detachably fixed to the end of the strut away from the vent block.

[0015] According to this technical solution, the setting of the elastic cushion block enables elastic contact between the strut and the pressure sensor to be measured, ensuring that when the strut moves towards the pressure sensor for pressure testing, damage to the pressure sensor is avoided.

[0016] In an alternative technical solution of the present utility model, it further includes: an adapter, detachably connected between the end of the strut away from the vent block and the elastic cushion block.

[0017] According to this technical solution, the setting of the adapter can facilitate the maintenance and replacement of the elastic cushion block and save costs.

[0018] In an alternative technical solution of the present utility model, it further includes a washer, disposed on the side of the vent block facing away from the telescopic end. The washer has: a sealing ring receiving groove, disposed in the middle of the washer, and the inner wall surface of the sealing ring receiving groove matches the outer wall surface of the sealing ring; two strut through holes, respectively disposed on opposite sides of the sealing ring receiving groove, and respectively aligned with the second groove portion in the telescopic direction, and the lengths of the second groove portion and the strut through holes are not greater than the length of the rod portion; and a mounting hole, penetrating through the washer, and a screw passes through the mounting hole and is fixed to the vent block.

[0019] According to this technical solution, the washer is disposed on the surface of the vent block facing the pressure sensor to be measured, which can reduce or alleviate the wear caused by long-term use of the vent block, thereby ensuring the detection sealing performance. The washer is detachably fixed to the vent block by screws, facilitating the installation, removal and replacement of the washer and saving costs. The setting of the sealing ring receiving groove ensures the seal between the sealing ring in the sealing ring receiving groove and the pressure sensor. The setting of the strut through holes can ensure the normal telescoping of the strut.

[0020] In an alternative technical solution of the present utility model, the sealing ring includes a first sealing ring layer and a second sealing ring layer connected in the telescopic direction. The first sealing ring layer is closer to the vent block than the second sealing ring layer, and the outer diameter of the first sealing ring layer is greater than the outer diameter of the second sealing ring layer.

[0021] According to this technical solution, since the outer diameter of the first sealing ring layer is greater than the outer diameter of the second sealing ring layer, a step portion is formed at the connection between the first sealing ring layer and the second sealing ring layer. Correspondingly, a shoulder portion for receiving the first sealing ring layer is formed on the inner wall surface of the sealing ring accommodating groove, thereby preventing the sealing ring from escaping from the sealing ring accommodating groove and ensuring the stability of the sealing ring in use.

[0022] In an optional technical solution of the utility model, the gas channel penetrates the sealing ring and extends out from the surface of the sealing ring away from the telescopic end; the part of the gas channel penetrating the sealing ring matches the inner ring of the sealing ring.

[0023] According to the technical solution, the gas channel is protruded from the surface of the sealing ring away from the telescopic end, which increases the depth of the gas channel inserted into the pressure sensor, is beneficial to prevent gas leakage, and improves the accuracy of the test.

[0024] In an optional technical solution of the utility model, the cylinder is a multi-axis cylinder, which improves the controllability and reliability of the pressure sensor inspection machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the pressure sensor inspection machine in the embodiment of the utility model.

[0026] Figure 2 It is a plan view of a pressure sensor inspection machine in an embodiment of the present utility model.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the assembly of the ventilation block and the rebound support in the embodiment of the utility model.

[0028] Figure 4 In the implementation mode of the utility model Figure 3 Schematic diagram from top view.

[0029] Figure 5 For the implementation of the utility model Figure 4 Schematic diagram of the cross-section along the AA section line.

[0030] Figure 6 For the implementation of the utility model Figure 4 Schematic diagram of the cross-section along the BB section line.

[0031] Reference numerals:

[0032] Cylinder 1; telescopic end 11; connecting plate 12; ventilation block 2; gas passage 20; inlet 201; outlet 202; first groove portion 21; second groove portion 22; resilient strut 3; spring 31; strut 32; head 321; rod portion 322; elastic cushion block 323; adapter 324; sealing ring 4; first sealing ring layer 41; second sealing ring layer 42; pressure sensor 5; pressure head 51; washer 6; sealing ring accommodation groove 61; strut through hole 62; mounting hole 63; screw 64. Detailed implementation mode

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figure 1 、 Figure 2 shown, this embodiment provides a pressure sensor inspection machine, including: a cylinder 1, a ventilation block 2, a resilient strut 3 and a sealing ring 4 (the resilient strut 3 and the sealing ring 4 are shown in Figure 5 、 Figure 6 ). The cylinder 1 has a telescopic end 11. The ventilation block 2 is fixed to the telescopic end 11. A gas passage 20 is formed inside the ventilation block 2. An inlet 201 and an outlet 202 of the gas passage 20 are respectively formed on the surface of the ventilation block 2, and the outlet 202 of the gas passage 20 is located on the surface of the ventilation block 2 facing away from the telescopic end 11 (for the gas passage 20, the inlet 201 and the outlet 202 can be referred to Figure 4 、 Figure 5 and Figure 6 ). The sealing ring 4 is correspondingly arranged at the outlet 202 of the gas passage 20; the resilient strut 3 is telescopically connected to the side of the ventilation block 2 facing away from the telescopic end 11, and the telescopic direction of the resilient strut 3 (such as the h direction in Figure 2 ) is the same as the telescopic direction of the telescopic end 11.

[0035] In the above manner, the telescopic end 11 of the cylinder 1 and the air vent block 2 move towards the direction close to the pressure sensor 5 to be measured. When the resilient support column 3 abuts against the pressure sensor 5, the elastic member (spring 31) of the resilient support column 3 is in a compressed state. When the telescopic end 11 of the cylinder 1 moves away from the pressure sensor 5 to be measured, the resilient support column 3 generates an elastic restoring force acting on the pressure sensor 5 and opposite to the moving direction of the cylinder 1 due to the deformation of the elastic member (spring 31), and the pressure sensor 5 and the sealing ring 4 are separated under the action of the elastic restoring force. By adding the resilient support column 3, it is possible to prevent the pressure sensor 5 from being combined with the sealing ring 4 and moving with the cylinder 1 after the detection is completed, resulting in secondary crushing of the pressure sensor 5, which is beneficial to reducing the defective rate of the product. It should be noted that the pressure sensor to be measured described in this embodiment and the pressure sensor 5 refer to the same pressure sensor.

[0036] Specifically, the cylinder 1 can be a multi-axis cylinder. The multi-axis cylinder improves the controllability and reliability of the pressure sensor inspection machine. The structure of the cylinder 1 is a common application form in the art and will not be described in detail here. The inlet 201 of the gas passage 20 has an internal thread, which is convenient for connecting with the outlet of the charging pipeline (not shown in the figure). The inlet 201 of the gas passage 20 is provided on the circumferential surface of the air vent block 2 (the surface perpendicular to the bottom surface of the air vent block 2), and the outlet 202 of the gas passage 20 is located on the bottom surface of the air vent block 2 (below the telescopic direction). Preferably, the gas passage 20 penetrates through the sealing ring 4 and extends out of the surface of the sealing ring 4 facing away from the telescopic end 11; the part of the gas passage 20 penetrating through the sealing ring 4 matches the inner ring of the sealing ring 4. The gas passage 20 protrudes from the surface of the sealing ring 4 facing away from the telescopic end 11, increasing the insertion depth of the gas passage 20 into the pressure sensor 5, which is beneficial to preventing gas leakage and improving the accuracy of the test.

[0037] In the preferred embodiment of the present utility model, as Figure 2 , Figure 5 shown, a first groove portion 21 and a second groove portion 22 that are connected in the telescopic direction are provided inside the air vent block 2. The first groove portion 21 is closer to the telescopic end 11 than the second groove portion 22, and the inner diameter of the first groove portion 21 is larger than the inner diameter of the second groove portion 22. In this embodiment, as Figure 5 shown, the bottom end (the end close to the second groove portion 22) of the first groove portion 21 may not be higher than the top end (the end close to the first groove portion 21) of the second groove portion 22. The head 321 of the support column 32 is fixed to the middle of the spring 31, which is beneficial to improving the structural stability of the resilient support column 3. In some embodiments, the bottom end of the first groove portion 21 may also be flush with the top end of the second groove portion 22, and the head 321 of the support column 32 is fixed to the bottom of the spring 31.

[0038] Combined with Figure 3As shown, the resilient strut 3 includes a spring 31 and a strut 32. The spring 31 is disposed in the first groove portion 21 and fixed to the telescopic end 11. The strut 32 includes a head portion 321 and a rod portion 322 connected along the telescopic direction. The head portion 321 is fitted in the first groove portion 21 and fixed to the spring 31. The rod portion 322 is fitted in the second groove portion 22, and one end of the rod portion 322 away from the head portion 321 can extend out of the second groove portion 22. Preferably, the length of the rod portion 322 extending out of the second groove portion 22 (the length in the telescopic direction) is not greater than the length of the first groove portion 21. In this embodiment, the structure of the resilient strut 3 is simple and easy to obtain. The connection manner between the resilient strut 3 and the ventilation block 2 is simple and easy to process and manufacture, which is beneficial to cost savings. In this embodiment, "fitted" means that the outer diameter of the head portion 321 is slightly smaller than the inner diameter of the first groove portion 21, and the outer diameter of the rod portion 322 is slightly smaller than the inner diameter of the second groove portion 22 to prevent the strut 32 from shaking in the ventilation block 2.

[0039] In this embodiment, in combination with Figure 1 and Figure 2 As shown, the spring 31 extends out of the upper surface of the ventilation block 2. A connecting plate 12 is provided between the telescopic end 11 of the cylinder 1 and the upper surface of the ventilation block 2. The connecting plate 12 is detachably fixed to the telescopic end 11 of the cylinder 1, and the ventilation block 2 is detachably fixed to the connecting plate 12. A spring receiving groove (not shown in the figure) for receiving the end of the spring 31 is provided in the connecting plate 12. The setting of the connecting plate 12 increases the contact area between the ventilation block 2 and the telescopic end 11, which is beneficial to improving the driving stability. The ventilation block 2, the connecting plate 12 and the cylinder 1 are detachably connected, which is convenient for the repair and replacement of parts and improves the convenience of use.

[0040] Further, it further includes an elastic cushion block 323, which is detachably fixed to the end of the strut 32 away from the ventilation block 2. The setting of the elastic cushion block 323 enables elastic contact between the strut 32 and the pressure sensor 5 to be measured, ensuring that when the strut 32 moves towards the pressure sensor 5 for pressure testing, damage to the pressure sensor 5 is avoided.

[0041] In a preferred embodiment of the present invention, the elastic cushion block 323 is detachably connected to the end of the strut 32 away from the ventilation block 2 through an adapter 324. The setting of the adapter 324 facilitates the repair and replacement of the elastic cushion block 323 and saves costs. In this embodiment, a blind hole matching the adapter 324 is provided at the end of the strut 32, a blind hole matching the adapter 324 is provided inside the elastic cushion block 323, and convex strips matching the blind hole of the strut 32 and the blind hole of the elastic cushion block 323 are formed at both ends of the adapter 324 for mating insertion.

[0042] In a preferred embodiment of the present invention, with continued reference to Figure 4 、 Figure 5As shown, the pressure sensor inspection machine further includes a washer 6 disposed on the side of the ventilation block 2 away from the telescopic end 11. The washer 6 has a sealing ring receiving groove 61, two support pillar through holes 62, and mounting holes 63. The sealing ring receiving groove 61 is provided in the middle of the washer 6, and the inner wall surface of the sealing ring receiving groove 61 matches the outer wall surface of the sealing ring 4. The two support pillar through holes 62 are respectively disposed on opposite sides of the sealing ring receiving groove 61 and are respectively aligned with the second groove portion 22 in the telescopic direction. Preferably, the total length of the second groove portion 22 and the support pillar through holes 62 is not greater than the length of the rod portion 322, so as to ensure that the rod portion 322 can extend out. The length of the rod portion 322 extending out of the support pillar through hole 62 is not greater than the length of the first groove portion 21, so as to maintain a certain margin of movement. In this embodiment, when the telescopic end 11 of the cylinder 1 moves downward until the support pillar 32 is subjected to the reaction force of the pressure sensor 5, the spring 31 is compressed, and the elastic cushion block 323 and the support pillar 32 move upward. The length of the support pillar 32 extending out of the support pillar through hole 62 is shortened or may be completely retracted into the ventilation block 2. When the telescopic end 11 of the cylinder 1 moves upward, under the action of the elastic restoring force of the spring 31, the support pillar 32 and the elastic cushion block 323 move downward. The length of the support pillar 32 extending out of the support pillar through hole 62 increases, and a downward acting force is applied to the pressure sensor 5, so that the pressure sensor 5 is separated from the sealing ring 4 in the washer 6. The mounting holes 63 penetrate through the washer 6, and the washer 6 is fixed to the ventilation block 2 by screws 64 passing through the mounting holes 63.

[0043] It should be noted that in this embodiment, when the spring 31 is in a natural state, the length of the support pillar 32 extending out of the support pillar through hole 62 is not limited. When the elastic restoration occurs, the length of the support pillar 32 or the overall length of the support pillar 32, the elastic cushion block 323, and the adapter 324 extending out of the support pillar through hole 62 can ensure that sufficient acting force is generated on the pressure sensor 5 to realize the separation of the pressure sensor 5 and the sealing ring 4.

[0044] In this embodiment, the washer 6 is disposed on the surface of the ventilation block 2 opposite to the pressure sensor 5 to be measured, which can reduce or alleviate the wear caused by the long-term use of the ventilation block 2, thereby ensuring the detection sealing performance. The washer 6 is detachably fixed to the ventilation block 2 by screws 64, which is convenient for the installation, disassembly, and replacement of the washer 6 and saves costs. The setting of the sealing ring receiving groove 61 ensures the sealing between the sealing ring 4 in the sealing ring receiving groove 61 and the pressure sensor 5. The setting of the support pillar through holes 62 can ensure the normal telescopic movement of the support pillar 32.

[0045] In a preferred embodiment of the present utility model, refer to Figure 5, the sealing ring 4 includes a first sealing ring layer 41 and a second sealing ring layer 42 connected in the telescopic direction. The first sealing ring layer 41 is closer to the ventilation block 2 than the second sealing ring layer 42, and the outer diameter of the first sealing ring layer 41 is larger than that of the second sealing ring layer 42. Since the outer diameter of the first sealing ring layer 41 is larger than that of the second sealing ring layer 42, a stepped portion is formed at the connection between the first sealing ring layer 41 and the second sealing ring layer 42. Correspondingly, a shoulder for receiving the first sealing ring layer 41 is formed on the inner wall surface of the sealing ring receiving groove 61, thereby preventing the sealing ring 4 from coming out of the sealing ring receiving groove 61 and ensuring the use stability of the sealing ring 4.

[0046] In some embodiments, the pressure sensor inspection machine further includes a probe (not shown) for supplying power to the pressure sensor to be tested.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure sensor inspection machine, characterized in that: include: a cylinder having a telescopic end; A ventilation block is fixed to the telescopic end, a gas channel is formed inside the ventilation block, an inlet of the gas channel and an outlet of the gas channel are respectively formed on the surface of the ventilation block, and the outlet of the gas channel is located on the surface of the ventilation block away from the telescopic end; A sealing ring, arranged correspondingly at the outlet of the gas channel; The rebound support is telescopically connected to a side of the ventilation block away from the telescopic end, and the telescopic direction of the rebound support is the same as the telescopic direction of the telescopic end.

2. The pressure sensor inspection machine according to claim 1, characterized in that: The ventilation block is provided with a first groove portion and a second groove portion connected in the telescopic direction, the first groove portion is closer to the telescopic end than the second groove portion, and the inner diameter of the first groove portion is larger than the inner diameter of the second groove portion; The rebound support comprises: A spring, disposed in the first groove and fixed to the telescopic end; The support comprises a head and a rod connected along the telescopic direction, wherein the head is matched in the first slot and fixed to the spring, the rod is matched in the second slot, and one end of the rod away from the head can extend out of the second slot.

3. The pressure sensor inspection machine according to claim 2, characterized in that: Also includes: The elastic pad is detachably fixed to the end of the support column away from the ventilation block.

4. The pressure sensor inspection machine according to claim 3, characterized in that: Also includes: The adapter is detachably connected between one end of the support far away from the ventilation block and the elastic pad.

5. The pressure sensor inspection machine according to any one of claims 2 to 4, characterized in that: Also includes: A gasket is arranged on a side of the vent block away from the telescopic end, The gasket has: A sealing ring receiving groove is provided in the middle of the gasket, and the inner wall surface of the sealing ring receiving groove matches the shape of the outer wall surface of the sealing ring; Two support holes are respectively arranged on opposite sides of the sealing ring accommodating groove and are respectively aligned with the second groove portion in the telescopic direction, and the length of the second groove portion and the support holes is not greater than the length of the rod portion; and The mounting hole passes through the washer, and the screw passes through the mounting hole and is fixed to the ventilation block.

6. The pressure sensor inspection machine according to claim 5, characterized in that: The sealing ring includes a first sealing ring layer and a second sealing ring layer connected in the telescopic direction, the first sealing ring layer is closer to the ventilation block than the second sealing ring layer, and the outer diameter of the first sealing ring layer is greater than the outer diameter of the second sealing ring layer.

7. The pressure sensor inspection machine according to claim 6, characterized in that: The gas channel penetrates the sealing ring and extends out from the surface of the sealing ring away from the telescopic end; the portion of the gas channel penetrating the sealing ring matches the inner ring of the sealing ring.

8. The pressure sensor inspection machine according to claim 1, characterized in that: The cylinder is a multi-axis cylinder.

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