阅读说明：本技术 一种用于附着系数利用率试验的气压手动、电动调节装置 (Pneumatic manual and electric adjusting device for adhesion coefficient utilization rate test ) 是由 李振中 胥峰 李兵 应宇汀 张鹏飞 屈亚洲 于 2020-07-06 设计创作，主要内容包括：本发明涉及汽车试验装置技术领域,公开一种用于附着系数利用率试验的气压手动、电动调节装置,包括：壳体,开设有第一第二安装腔；第一安装腔中安装有减速器,减速器包括输出轴,输出轴上连接有传动齿轮；调压阀,包括阀座、调压螺杆和调节齿轮；调压螺杆用于调节阀座出气压力,端部设有用于手动调节的调节部；调节齿轮设在调压螺杆上,与传动齿轮啮合,调节齿轮用于驱动调压螺杆伸缩运动；阀座中开设有第一第二气流通道,第一气流通道贯穿阀体,在阀体上形成一进气口一出气口,第一气流通道中活动设有切换塞；一级二级过滤器总成,与第一气流通道连通。本发明的优点在于,调节装置可手动电动调节,调节便捷、调节精度高,且功能多、占用空间小。(The invention relates to the technical field of automobile test devices, and discloses a pneumatic manual and electric adjusting device for an adhesion coefficient utilization rate test, which comprises: the shell is provided with a first mounting cavity and a second mounting cavity; a speed reducer is arranged in the first mounting cavity and comprises an output shaft, and a transmission gear is connected to the output shaft; the pressure regulating valve comprises a valve seat, a pressure regulating screw rod and a regulating gear; the pressure regulating screw is used for regulating the pressure of the air outlet of the valve seat, and the end part of the pressure regulating screw is provided with a regulating part for manual regulation; the adjusting gear is arranged on the pressure adjusting screw rod and meshed with the transmission gear, and the adjusting gear is used for driving the pressure adjusting screw rod to move in a stretching mode; a first air flow channel and a second air flow channel are arranged in the valve seat, the first air flow channel penetrates through the valve body, an air inlet and an air outlet are formed in the valve body, and a switching plug is movably arranged in the first air flow channel; the first-stage and second-stage filter assembly is communicated with the first air flow passage. The invention has the advantages that the adjusting device can be manually and electrically adjusted, is convenient to adjust and high in adjusting precision, and has multiple functions and small occupied space.)

1. The utility model provides a manual, electronic adjusting device of atmospheric pressure for adhering to coefficient utilization ratio is experimental which characterized in that, including:

the device comprises a shell, a first connecting piece and a second connecting piece, wherein a first mounting cavity and a second mounting cavity are formed in the shell; the speed reducer is arranged in the first mounting cavity and comprises an output shaft, and the output shaft penetrates through the first mounting cavity and extends out of the shell; the output shaft is connected with a transmission gear;

the pressure regulating valve is arranged on the side edge of the shell and comprises a valve seat, a pressure regulating screw rod and a regulating gear; the pressure regulating screw rod penetrates through the second mounting cavity, one end of the pressure regulating screw rod extends out of the shell and is connected with the regulating gear, the pressure regulating screw rod is used for regulating the air outlet pressure of the valve seat, and the end part of the pressure regulating screw rod is provided with a regulating part for manual regulation; the adjusting gear is sleeved on the pressure adjusting screw and meshed with the transmission gear, and the adjusting gear is used for driving the pressure adjusting screw to move in a stretching mode; a first air flow channel and a second air flow channel are arranged in the valve seat, the first air flow channel penetrates through the valve seat, an air inlet and an air outlet are formed in the valve seat, and a switching plug for switching an air flow path is movably arranged in the first air flow channel;

the primary filter assembly and the secondary filter assembly are communicated with the first air flow passage, and the primary filter assembly and the secondary filter assembly are communicated through the second air flow passage.

2. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test is characterized by further comprising a cover body, wherein the cover body is covered on the shell and forms an installation space with the shell in a surrounding mode, and the transmission gear and the adjusting gear are located in the installation space.

3. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test of claim 2, wherein the adjusting portion is a hexagonal groove, the cover body is provided with a through hole, the through hole is located opposite to the groove, and a blocking cover is movably arranged in the through hole.

4. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test is characterized in that the pressure adjusting valve further comprises a valve body, an air guide block, a first membrane, a second membrane and a third membrane which are arranged in parallel;

the valve body is arranged between the shell and the valve seat, and the first diaphragm, the second diaphragm and the third diaphragm are sequentially arranged in the valve body side by side at intervals; the air guide block is arranged between the second diaphragm and the third diaphragm; the pressure regulating screw rod is sleeved with a nut and a spring and can move telescopically along the nut; one end of the spring abuts against the nut, and the other end of the spring abuts against the first diaphragm.

5. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test is characterized in that the pressure adjusting valve further comprises an air flow plug; the valve seat is provided with a gas containing cavity communicated with the first gas flow channel, the gas flow plug is arranged in the gas containing cavity, and the gas flow plug is provided with a hemispherical raised head;

the air guide block is arranged in a columnar shape, an air guide hole matched with the hemispherical raised head is formed in the middle of the air guide block, a first air guide channel and a second air guide channel which are communicated with each other and are vertical to each other are formed in the cylindrical surface of the air guide block, and the first air guide channel and the second air guide channel are communicated with the air guide hole; the hemispherical raised head is arranged at the air guide hole.

6. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test is characterized in that an air inlet pressure sensor and an air outlet pressure sensor are further arranged on the valve seat; the inlet pressure sensor is communicated with the first air flow channel, and the outlet pressure sensor is communicated with the gas containing cavity.

7. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test of claim 1, wherein a mounting hole is formed in the valve seat along a direction perpendicular to the first air flow passage, and the mounting hole is communicated with the first air flow passage; the switching plug is rotatably arranged in the mounting hole.

8. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test is characterized in that the switching plug is provided with a through hole; and the switching plug is rotated to control the through hole to be communicated with the first air flow channel or to seal the through hole.

9. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test is characterized in that a throttling filter element is arranged in the secondary filter assembly; the end part of the secondary filter assembly is provided with a drain valve, and the cross section of the end part of the secondary filter assembly is gradually reduced from the side close to the first air flow channel to the side far away from the first air flow channel.

10. The pneumatic manual and electric adjusting device for the adhesion coefficient utilization rate test is characterized in that the speed reducer further comprises a first gear shaft, a second gear shaft and a third gear shaft which are arranged in parallel; each gear shaft is coaxially provided with a large gear and a small gear in parallel; a pinion on the first gear shaft is meshed with a bull gear on the second gear shaft; a pinion on the second gear shaft is meshed with a bull gear on a third gear shaft; an output gear which is coaxial with the transmission gear is arranged on the output shaft, and a pinion on the third gear shaft is meshed with the output gear; and bearings are sleeved at the two ends of the first gear shaft, the second gear shaft, the third gear shaft and the output shaft.

Technical Field

The invention relates to the technical field of automobile test devices, in particular to a pneumatic manual and electric adjusting device for an adhesion coefficient utilization rate test.

Background

An anti-lock braking system (ABS) for a vehicle is an effective safety device for a vehicle, which can greatly improve steering ability and direction stability during braking of the vehicle by automatically adjusting pressure during braking to make wheels in a stable state. The utilization rate of the adhesion coefficient is one of important evaluation indexes of an anti-lock brake system of an automobile.

In the adhesion coefficient utilization rate test, the currently adopted test device and test method are as follows: one is to install a pressure regulating valve in the brake pipeline and disconnect the brake pipeline of the front and rear axles separately. The other is that the pedal stroke is controlled by a brake pedal stroke adjusting mechanism to adjust the brake pressure, and front and rear brake pipelines are respectively disconnected. For the former test method, usually, a tester obtains a plurality of groups of air sources with different pressures through manually adjusting a pressure regulating valve for testing, the problems of poor adjustment precision and troublesome adjustment exist in the process, and when a test device fails, professional after-sales maintenance personnel are required to maintain the test device, so that the test efficiency is affected, and the maintenance is difficult. In the experimentation, need use the air supply of different kind, different cleanliness degrees sometimes to test, this just needs to purchase different gas pitchers and tests, leads to the experimental cost high, and switches the operation process of air supply loaded down with trivial details, and numerous experimental accessories, occupation space is big, just needs to test at broad experimental space, and this also makes the cost of software testing improve undoubtedly.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, the invention aims to provide a pneumatic manual and electric adjusting device for an adhesion coefficient utilization rate test, which is convenient and fast to adjust, high in adjustment precision, multifunctional and small in occupied space.

The invention solves the technical problem and adopts the technical proposal that a pneumatic manual and electric adjusting device for an adhesion coefficient utilization rate test is provided, which comprises:

the device comprises a shell, a first connecting piece and a second connecting piece, wherein a first mounting cavity and a second mounting cavity are formed in the shell; the speed reducer is arranged in the first mounting cavity and comprises an output shaft, and the output shaft penetrates through the first mounting cavity and extends out of the shell; the output shaft is connected with a transmission gear;

the pressure regulating valve is arranged on the side edge of the shell and comprises a valve seat, a pressure regulating screw rod and a regulating gear; the pressure regulating screw rod penetrates through the second mounting cavity, one end of the pressure regulating screw rod extends out of the shell and is connected with the regulating gear, the pressure regulating screw rod is used for regulating the air outlet pressure of the valve seat, and the end part of the pressure regulating screw rod is provided with a regulating part for manual regulation; the adjusting gear is sleeved on the pressure adjusting screw and meshed with the transmission gear, and the adjusting gear is used for driving the pressure adjusting screw to move in a stretching mode; a first air flow channel and a second air flow channel are arranged in the valve seat, the first air flow channel penetrates through the valve seat, an air inlet and an air outlet are formed in the valve seat, and a switching plug for switching an air flow path is movably arranged in the first air flow channel;

the primary filter assembly and the secondary filter assembly are communicated with the first air flow passage, and the primary filter assembly and the secondary filter assembly are communicated through the second air flow passage.

The transmission gear and the adjusting gear are arranged in the mounting space, and the transmission gear and the adjusting gear are arranged in the mounting space.

Furthermore, the adjusting part is a hexagonal groove, a through hole is formed in the cover body, the through hole is located at a position opposite to the groove, and a blocking cover is movably arranged in the through hole.

Furthermore, the pressure regulating valve also comprises a valve body, an air guide block, a first diaphragm, a second diaphragm and a third diaphragm which are arranged in parallel;

the valve body is arranged between the shell and the valve seat, and the first diaphragm, the second diaphragm and the third diaphragm are sequentially arranged in the valve body side by side at intervals; the air guide block is arranged between the second diaphragm and the third diaphragm; the pressure regulating screw rod is sleeved with a nut and a spring and can move telescopically along the nut; one end of the spring abuts against the nut, and the other end of the spring abuts against the first diaphragm.

Further, the pressure regulating valve also comprises an airflow plug; the valve seat is provided with a gas containing cavity communicated with the first gas flow channel, the gas flow plug is arranged in the gas containing cavity, and the gas flow plug is provided with a hemispherical raised head;

the air guide block is arranged in a columnar shape, an air guide hole matched with the hemispherical raised head is formed in the middle of the air guide block, a first air guide channel and a second air guide channel which are communicated with each other and are vertical to each other are formed in the cylindrical surface of the air guide block, and the first air guide channel and the second air guide channel are communicated with the air guide hole; the hemispherical raised head is arranged at the air guide hole.

Further, an air inlet pressure sensor and an air outlet pressure sensor are also arranged on the valve seat; the inlet pressure sensor is communicated with the first air flow channel, and the outlet pressure sensor is communicated with the gas containing cavity.

Furthermore, a mounting hole is formed in the valve seat along a direction perpendicular to the first air flow channel, and the mounting hole is communicated with the first air flow channel; the switching plug is rotatably arranged in the mounting hole.

Further, the switching plug is provided with a through hole; and the switching plug is rotated to control the through hole to be communicated with the first air flow channel or to seal the through hole.

Furthermore, a throttling filter core is arranged in the secondary filter assembly; the end part of the secondary filter assembly is provided with a drain valve, and the cross section of the end part of the secondary filter assembly is gradually reduced from the side close to the first air flow channel to the side far away from the first air flow channel.

Furthermore, the speed reducer also comprises a first gear shaft, a second gear shaft and a third gear shaft which are arranged in parallel; each gear shaft is coaxially provided with a large gear and a small gear in parallel; a pinion on the first gear shaft is meshed with a bull gear on the second gear shaft; a pinion on the second gear shaft is meshed with a bull gear on a third gear shaft; an output gear which is coaxial with the transmission gear is arranged on the output shaft, and a pinion on the third gear shaft is meshed with the output gear; and bearings are sleeved at the two ends of the first gear shaft, the second gear shaft, the third gear shaft and the output shaft.

Compared with the prior art, the invention has at least the following beneficial effects:

according to the invention, a multistage speed reducer is installed in a first installation cavity of a shell, an adjusting part of a pressure regulating valve is installed in a second installation cavity, the pressure regulating valve and the speed reducer are arranged side by side and integrally, after multistage speed reduction, a transmission gear is meshed with an adjusting gear for transmission to drive the adjusting gear to rotate, so that electric adjustment of test air pressure is realized, the rotation range of the transmission gear and the adjusting gear is accurately controlled by controlling the rotation number of turns of the motor, the expansion amount of a pressure regulating screw rod is further accurately controlled, the size of the air pressure is accurately controlled, and an air inlet pressure sensor and an air outlet pressure sensor are arranged on a valve seat, so that the size of the test pressure is further ensured, and the test accuracy is ensured; when the motor or the speed reducer is in failure, the blocking cover on the cover body can be taken down under the condition that the failure cannot be solved for a while, the inner hexagonal wrench is inserted into the adjusting part of the pressure adjusting screw, the pressure adjusting screw is manually rotated to manually adjust air pressure, the process and efficiency of the test are ensured, manual and electric adjustment is realized, the operation is simple and convenient, the process of the test can be effectively ensured, the transmission gear and the adjusting gear are isolated in an installation space formed by the shell and the cover body, the adjustment is convenient and fast at any time, and the engagement of the transmission gear and the adjusting gear cannot be interfered by other parts; the adjusting device has compact integral structure and small occupied space.

In the invention, a first airflow channel and a second airflow channel are arranged on a valve seat, a primary filter assembly and a secondary filter assembly are integrally arranged on the valve seat, the primary filter assembly and the secondary filter assembly are communicated through the second airflow channel, and when the gas in a gas storage tank is directly used for testing, a switching plug is rotated to enable a through hole on the switching plug to be communicated with the first airflow channel, so that the gas in the gas storage tank can directly pass through the first airflow channel without passing through the primary filter assembly and the secondary filter assembly and enter a testing pipeline; when the gas that needs high purification degree is tested, the rotation switches the stopper for the through-hole shutoff on the switching stopper, switch the stopper promptly and block up the first airflow channel of air inlet department, make after gas gets into primary filter assembly, second airflow channel, second grade filter assembly in proper order, export to the test pipeline through the latter half section of first airflow channel in, realize adjusting device's a tractor serves several purposes, reduce the test cost, and save test space, and the switching process is simple, high-efficient.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 3 is an exploded view of the overall structure;

FIG. 4 is a schematic structural view of the case, the cover, and the primary and secondary filter covers removed integrally;

FIG. 5 is a schematic view of the structure of FIG. 2 with the housing and cover removed;

FIG. 6 is a schematic view of the internal structure of the speed reducer;

FIG. 7 is a schematic view of the assembly of the housing and cover;

FIG. 8 is a schematic view of the internal structure of the pressure reducing valve;

FIG. 9 is a schematic view of the gas directing block;

FIG. 10 is a schematic cross-sectional view taken along the axis of FIG. 9;

FIG. 11 is a schematic structural view of a valve body;

FIG. 12 is a schematic view of the structure of FIG. 11 from another perspective;

FIG. 13 is a schematic view of the first and second airflow passages in the primary and secondary filters and valve seat;

FIG. 14 is a schematic view of FIG. 13 with the primary and secondary filter caps removed;

fig. 15 is a schematic view of fig. 14 from another perspective.

In the figure, the position of the upper end of the main shaft,

1. a housing; 10. a first mounting cavity; 11. a second mounting cavity;

2. a speed reducer; 20. an output shaft; 21. a transmission gear; 22. a first gear shaft; 23. a second gear shaft; 24. a third gear shaft; 25. a bearing; 201. an output gear; 221. a bull gear; 222. a pinion gear;

3. a pressure regulating valve; 30. a valve seat; 31. a pressure regulating screw; 32. an adjusting gear; 33. a switching plug; 341. a front valve body; 342. a rear valve body; 35. a gas guide block; 36. a first diaphragm; 37. a second diaphragm; 38. a third diaphragm; 39. a nut; 40. a spring; 41. an airflow plug; 410. a hemispherical raised head; 42. a screw cap; 43. a seal ring; 301. a first air flow passage; 302. a second airflow channel; 303. an air inlet; 304. an air outlet; 305. a gas receiving chamber; 306. mounting holes; 307. an intake air pressure sensor; 308. an outlet gas pressure sensor; 310. an adjustment section; 330. a through hole; 351. an air vent; 352. a first air guide channel; 353. a second air guide channel;

4. a primary filter assembly; 5. a secondary filter assembly; 50. a throttle filter; 51. a drain valve;

6. a cover body; 60. a through hole; 61. and (7) blocking the cover.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-7, a pneumatic manual and electric adjusting device for adhesion coefficient utilization test mainly comprises: the device comprises a shell 1, a speed reducer 2, a pressure regulating valve 3, a primary filter 4, a secondary filter 5 and a cover body 6.

The device comprises a shell 1, wherein a first mounting cavity 10 and a second mounting cavity 11 are formed in the shell 1; the speed reducer 2 is installed in the first installation cavity 10, the speed reducer 2 comprises an output shaft 20, and the output shaft 20 penetrates through the first installation cavity 10 and extends out of the shell 1; a transmission gear 21 is connected to the output shaft 20; specifically, as shown in fig. 6, the speed reducer 2 further includes a first gear shaft 22, a second gear shaft 23, and a third gear shaft 24 that are arranged in parallel; a large gear 221 and a small gear 222 are coaxially arranged on each gear shaft side by side, wherein each gear shaft can be arranged in a split manner or in an integrated manner; the large gear 221 on the first gear shaft 22 is used for meshing with an input gear of a motor to input power, and the large gear 221 on the first gear shaft 22 is a helical gear, so that meshing stability is guaranteed, and meshing noise is reduced; the small gear 221 on the first gear shaft 22 is meshed with the large gear 221 on the second gear shaft 23; the small gear 222 on the second gear shaft 23 is meshed with the large gear 221 on the third gear shaft, and is transmitted through three groups of gear sets on the first gear shaft 22, the second gear shaft 23 and the third gear shaft 24, namely three-level speed reduction is performed, so that the stable rotating speed output of the motor is ensured; an output gear 201 which is coaxial with the transmission gear 21 is arranged on the output shaft 20, and a pinion 221 on the third gear shaft 24 is meshed with the output gear 201, which is equivalent to primary speed reduction output; the first gear shaft 22, the second gear shaft 23, the third gear shaft 24 and the output shaft 20 are arranged in parallel, two ends of the first gear shaft, the second gear shaft, the third gear shaft and the output shaft are all sleeved with a bearing 25, a bearing hole (not marked) is formed in the shell 1, and the bearing 25 close to the side of the shell 1 is arranged in the bearing hole.

As shown in fig. 1-3 and fig. 8-15, the pressure regulating valve 3, which is arranged at the side of the housing 1, comprises a valve seat 30, a pressure regulating screw 31 and a regulating gear 32; the pressure regulating screw 31 penetrates through the second mounting cavity 11, one end of the pressure regulating screw 31 extends out of the housing 1 and is connected with the regulating gear 32, and the pressure regulating screw 31 is used for regulating the air outlet pressure of the valve seat 30, specifically, the compression amount of the spring 40 is controlled by the telescopic motion of the pressure regulating screw 31, so that the stress of the spring 40 is controlled, and the output pressure is controlled; and the end of the pressure regulating screw 31 is provided with an adjusting part 310 for manual adjustment, specifically, the adjusting part 310 is a hexagonal groove for the inner hexagonal wrench to be clamped, and then the pressure regulating screw 31 is screwed to realize the manual adjustment of the air pressure. Preferably, a multi-stage speed reducer 2 is installed in the first installation cavity 10 of the housing 1, an adjusting part of the pressure regulating valve 3 is installed in the second installation cavity 11, the pressure regulating valve 3 and the speed reducer 2 are arranged side by side and integrally, the transmission gear 21 and the adjusting gear 32 are in meshing transmission after multi-stage speed reduction through the rotation of the motor to drive the adjusting gear 32 to rotate, so that the electric adjustment of the test air pressure is realized, the rotation range of the transmission gear 21 and the adjusting gear 32 is accurately controlled through controlling the rotation number of the motor, the expansion amount of the pressure regulating screw 31 is further accurately controlled, the size of the air pressure is accurately controlled, and the air inlet pressure sensor 307 and the air outlet pressure sensor 308 are arranged on the valve seat 30, so that the size of the test pressure is further ensured, and; and when the motor or the speed reducer 2 has a fault, under the condition that the fault cannot be solved for a while, the blocking cover 61 on the cover body 6 can be taken down, the adjusting part 310 of the pressure adjusting screw rod 31 is inserted by using an inner hexagonal wrench, the pressure adjusting screw rod 31 is manually rotated to manually adjust air pressure, the process and efficiency of the test are ensured, manual and electric adjustment is realized, the operation is simple and convenient, and the process of the test can be effectively ensured.

The adjusting gear 32 is sleeved on the pressure adjusting screw rod 31 and meshed with the transmission gear 21, and the adjusting gear 32 is used for driving the pressure adjusting screw rod 31 to move in an extending and contracting manner; the valve seat 30 is provided with a first air flow channel 301 and a second air flow channel 302, the first air flow channel 301 penetrates through the valve seat 30, and an air inlet 303 and an air outlet 304 are formed on the valve seat 30, the air inlet 303 and the air outlet 304 are positioned on the side surface of the valve seat 30, a switching plug 33 for switching an air flow path is movably arranged in the first air flow channel 301, and the diameter of the first air flow channel 301 is larger than that of the second air flow channel 302, so that when the switching plug 33 does not block the first air flow channel 302, air can preferentially flow from the first air flow channel 302 with the larger diameter.

Specifically, a mounting hole 306 is formed in the valve seat 30 along a direction perpendicular to the first air flow channel 301, and the mounting hole 306 is communicated with the first air flow channel 301; the switch plug 33 is rotatably arranged in the mounting hole 306, and the switch plug 33 is provided with a through hole 330; and the switching plug 33 is rotated to control the communication between the through hole 330 and the first air flow channel 301 or to block the through hole 330.

As shown in fig. 12-15, the primary filter assembly 4 and the secondary filter assembly 5 are in communication with the first air flow passage 301, and the primary filter assembly 4 and the secondary filter assembly 5 are in communication with each other through the second air flow passage 302. The throttling filter element 50 is arranged in the secondary filter assembly 5 to ensure the cleanliness of the purified gas, the drain valve 51 is arranged at the end part of the secondary filter assembly 5, the cross section of the end part of the secondary filter assembly 5 is gradually reduced from the side close to the first air flow channel 301 to the side far away from the first air flow channel 301, when water is collected in the secondary filter assembly 5, the water is completely collected to the bottom of the cover body of the secondary filter assembly 5 through the laterally arranged secondary filter assembly 5, the cross section gradually changes, so that the collection of the water is facilitated, and the water is discharged at one time.

The valve seat 30 is provided with a first air flow channel 301 and a second air flow channel 302, the valve seat 30 is integrally provided with a primary filter assembly 4 and a secondary filter assembly 5, the primary filter assembly 4 and the secondary filter assembly 5 are communicated through the second air flow channel 302, when the gas in the gas storage tank is directly used for testing, the switching plug 33 is rotated, so that the through hole 330 on the switching plug 33 is communicated with the first air flow channel 301, and the gas in the gas storage tank can directly pass through the first air flow channel 301 without passing through the primary filter assembly 4 and the secondary filter assembly 5 to enter a testing pipeline; when the gas with high purification degree is required to be tested, the switching plug 33 is rotated to plug the through hole in the switching plug 33, and the switching plug 33 blocks the first air flow channel 301 at the air inlet 303, so that the gas enters the primary filter assembly 4, the second air flow channel assembly 5 and the secondary filter in sequence and is output to a test pipeline through the rear half section of the first air flow channel 301, the multiple purposes of the adjusting device are realized, the test cost is reduced, the test space is saved, and the switching process is simple and efficient.

Preferably, the adjusting device further comprises a cover body 6, the cover body is covered on the housing 1, and an installation space (not labeled in the figure) is enclosed by the cover body 1, the transmission gear 21 and the adjusting gear 32 are both located in the installation space, the transmission gear 21 and the adjusting gear 32 are isolated in the installation space formed by the housing 1 and the cover body 6, the adjustment is convenient and fast at any time, and the engagement between the transmission gear and the adjusting gear is not interfered by other components; the adjusting device has compact integral structure and small occupied space. The recess of regulating part 310 for being the hexagon, a through-hole 60 has been seted up on lid 6, just through-hole 60 be in with the position that the recess is relative is provided with a fender lid 61 in the through-hole 60 movably, twists the periphery that moves fender lid 61, can take off fender lid 61 to convenient direct hexagonal spanner with the interior twists pressure regulating screw 31.

As shown in fig. 3-4 and 8-10, the pressure regulating valve 3 further comprises a valve body (wherein the valve body comprises a front valve body 341 and a rear valve body 342), an air guide block 35, and a first diaphragm 36, a second diaphragm 37 and a third diaphragm 38 which are arranged in parallel; namely, the valve body is arranged in a split manner; the valve body is arranged between the shell 1 and the valve seat 30, specifically, the air guide block 35 is arranged between a second diaphragm 37 and a third diaphragm 38, the first diaphragm 36, the second diaphragm 37 and the third diaphragm 38 are arranged in the valve body side by side and at intervals in sequence, and the first diaphragm 37 can move back and forth in the valve body, so as to change the magnitude of output air pressure; a nut 39 and a spring 40 are sleeved on the pressure regulating screw rod 31, and the pressure regulating screw rod 31 can move telescopically along the nut 39, namely the nut 39 is fixedly arranged relative to the valve seat 30; one end of the spring 40 abuts against the nut 39, and the other end of the spring 40 abuts against the first diaphragm 36. When the pressure adjusting screw 31 is turned, the pressure adjusting screw 31 extends and contracts relative to the nut 39, and if the pressure adjusting screw 31 compresses the spring 40, the first diaphragm 36 is pushed to move relative to the second diaphragm 37, and the output air pressure is increased.

The pressure regulating valve 3 further comprises an airflow plug 41; the valve seat 30 is provided with an air accommodating cavity 305 communicated with the first air flow channel 301, the air flow plug 41 is arranged in the air accommodating cavity 305, the air flow plug 41 is provided with a hemispherical raised head 410, the air guide block 35 is arranged in a columnar shape, the middle part of the air guide block 35 is provided with an air guide hole 351 matched with the hemispherical raised head 410, the cylindrical surface of the air guide block 35 is provided with a first air guide channel 352 and a second air guide channel 353 which are communicated with each other and are vertical to each other, and the first air guide channel 352 and the second air guide channel 353 are both communicated with the air guide hole 351; the hemispherical raised head 410 is arranged at the air guide hole 351, the air output can be controlled by controlling the position of the hemispherical raised head 410 relative to the air guide hole 351, the output air pressure of the pressure regulating valve 3 is controlled, and the end part of the air guide hole 351 is an inwards concave surface, so that the air guide hole 351 can be stably matched with the hemispherical raised head 410. The airflow plug 41 has a reasonable structure, when the input air pressure is increased, the pressure adjusting screw 31 does not move in a telescopic manner, so that the air guide hole 351 tends to change relative to the position of the hemispherical raised head 410 due to the large air pressure, and finally, the whole body tends to be stable due to the forward and backward movement of the first membrane, and the output air pressure tends to be unchanged. An air inlet pressure sensor 307 and an air outlet pressure sensor 308 are also arranged on the valve seat 30; the inlet pressure sensor 307 is communicated with the first air flow channel 301 for monitoring the pressure value at the inlet end in real time, and the outlet pressure sensor 308 is communicated with the gas accommodating cavity 305 for monitoring the pressure value at the outlet end in real time.

During operation, the air inlet pipe is connected to the air inlet 303 of the valve seat 30, the air outlet 304 of the valve seat 30 is connected to the test pipe, and the motor is in mesh transmission with the bevel gear of the first gear shaft 22 through a bevel gear. The motor drives the bevel gear on the first gear shaft 22 to rotate, power is input, the power is output to the transmission gear 21 after multi-stage speed reduction is carried out on the first gear shaft 22, the second gear shaft 23, the third gear shaft 24 and the large gear 221 and the small gear 222 on the output shaft 20 in the speed reducer 2, the transmission gear 21 drives the adjusting gear 32 to rotate, the pressure adjusting screw 31 is made to move in an extending and contracting mode, the pressure adjusting screw 31 drives the spring 40 to move in an extending and contracting mode, the first membrane 36 is made to move back and forth, the air pressure is changed, generally, pressure reduction is carried out, the air pressure is output to the air outlet 304, and the air pressure. When the air inlet pipeline needs to be switched in the test (assuming that the through hole 330 in the switching plug 33 is communicated with the first air flow channel before), the switching plug 33 is rotated, so that the switching plug 33 seals the first air flow channel 301, and the air flow passes through the primary filter 4 and the secondary filter 5 and is output to the test pipeline through the rear half section of the first air flow channel 301; the adjustment is simple.

The adjusting device of this scheme adjusts convenient, adjusts the precision height, and the function is many, occupation space is little.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.