CN109586247B - Pressure overload protection device of bearing axial clearance testing machine - Google Patents
Pressure overload protection device of bearing axial clearance testing machine Download PDFInfo
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- CN109586247B CN109586247B CN201811384154.XA CN201811384154A CN109586247B CN 109586247 B CN109586247 B CN 109586247B CN 201811384154 A CN201811384154 A CN 201811384154A CN 109586247 B CN109586247 B CN 109586247B
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- cylindrical section
- testing machine
- axial clearance
- microswitch
- bearing axial
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a pressure overload protection device for a bearing axial clearance testing machine, which comprises a lower connector (1), a lower end cover (2), a cylinder body (3), a heavy-duty rectangular pressure spring (4), a three-core plug (5), a microswitch (6), an inner hexagonal flat head screw (7), a microswitch (8), a microswitch fixing plate (9), an upper connector (10) and an upper end cover (11). The invention is arranged between the pressure sensor of the bearing axial clearance testing machine and the tested bearing, and can protect the sensor and the equipment of the bearing axial clearance testing machine from being damaged due to pressure overload in the testing process of the bearing axial clearance testing machine, thereby having reliable and efficient work and ensuring the quality.
Description
Technical Field
The invention relates to a pressure overload protection device of a bearing axial clearance testing machine, and belongs to the technical field of mechanical manufacturing.
Background
In the process of testing the axial clearance of the main bearing of the engine, the pressure overload of the bearing axial clearance testing machine frequently causes the damage of a sensor due to various uncertain factors, and in order to avoid the problem that the pressure overload damages the sensor, a pressure overload protection device of the bearing axial clearance testing machine is designed and is arranged between the pressure sensor of the bearing axial clearance testing machine and a tested bearing. In the experimental process, when the measured pressure is lower than the set pressure value of the pressure overload protection device, the bearing axial clearance testing machine is in a normal working state. If the pressure of the medium to be measured is higher than the set pressure value of the pressure overload protection device, the pressure overload protection device can cut off the working power supply of the bearing axial clearance testing machine to implement pressure in time, and the purpose of protecting the sensor and equipment of the bearing axial clearance testing machine from being damaged due to overpressure is achieved. The axial clearance testing machine not only solves the problem that the sensor and the equipment are damaged due to pressure overload in the working process of the axial clearance testing machine of the bearing, but also saves the cost, ensures the working quality and well meets the use requirement.
Disclosure of Invention
The invention aims to provide a pressure overload protection device for a bearing axial clearance testing machine, which can protect a sensor and equipment of the bearing axial clearance testing machine from being damaged due to pressure overload in the testing process of the bearing axial clearance testing machine, is reliable and efficient in work and ensures the quality.
The invention is realized by the following technical scheme:
a pressure overload protection device of a bearing axial clearance testing machine is arranged between a pressure sensor of the bearing axial clearance testing machine and a tested bearing and comprises a microswitch and a trigger piece for triggering the microswitch;
the axis of the trigger piece coincides with the load direction of the bearing axial clearance testing machine, and comprises a barrel body, wherein the two ends of the barrel body are detachably connected with an upper end cover and a lower end cover respectively, the upper end cover is connected with a micro switch, a lower connector is arranged in the barrel body, one end of the lower connector is slidably connected with an upper connector used for triggering the micro switch, and a heavy-load rectangular pressure spring is arranged outside the upper connector and in the barrel body.
The microswitch is connected with the upper end cover through a microswitch fixing plate, the microswitch fixing plate is connected with the microswitch cover through an inner hexagonal flat head screw, and a three-core plug is arranged on the microswitch cover.
The cylinder body is a hollow cylindrical pipe, and the upper end and the lower end of the outer surface of the cylinder body are provided with threads.
The upper end of the upper end cover is provided with a threaded hole, the lower end of the threaded hole is provided with a circular through hole, and the upper end surface of the upper end cover is also provided with a groove.
The lower end cover is provided with a stepped threaded hole which penetrates through the upper end surface and the lower end surface of the lower end cover and has different outer diameters.
The upper connector is a step-shaped cylinder and comprises a first cylindrical section, a second cylindrical section, a third cylindrical section, a fourth cylindrical section, a fifth cylindrical section and a sixth cylindrical section, wherein the first cylindrical section is in sliding connection with the lower connector, the second cylindrical section is used for positioning in the cylinder body, the third cylindrical section is used for being connected with a heavy-load rectangular pressure spring, the fourth cylindrical section is used for being matched with the upper end cover, the fifth cylindrical section and the sixth cylindrical section are used for being connected with the bearing axial clearance testing machine, threads are arranged on the outer surface of the fifth cylindrical section, and a positioning bolt hole is.
The lower connecting body is a hollow step cylinder and comprises a seventh cylindrical section connected with the heavy-duty rectangular pressure spring, an eighth cylindrical section used for positioning in the cylinder body, a ninth cylindrical section connected with the lower end cover and a tenth cylindrical section connected with the bearing axial clearance testing machine.
Compared with the prior art, the pressure overload protection device of the bearing axial clearance testing machine is arranged between the pressure sensor of the bearing axial clearance testing machine and the tested bearing and used for timely cutting off the feeding power supply of the bearing axial clearance testing machine when the pressure of the tested medium is higher than the set pressure value of the pressure overload protection device, so that the sensor of the bearing axial clearance testing machine is protected from being damaged due to overpressure, and the bearing axial clearance testing machine can be switched on to be in a working state of normally displaying the pressure of the tested medium when the tested pressure is lower than the set pressure value.
Drawings
FIG. 1 is a schematic view of a pressure overload protection device of a bearing axial clearance testing machine;
FIG. 2 is a schematic structural diagram of a pressure overload protection device;
FIG. 3 is a schematic view of a lower connecting body of the pressure overload protection device;
FIG. 4 is a schematic view of a lower end cap of the pressure overload protection apparatus;
FIG. 5 is a schematic view of a pressure overload protection device cartridge;
FIG. 6 is a schematic view of a microswitch cover of the pressure overload protection device;
FIG. 7 is a schematic view of a microswitch fixing plate of the pressure overload protection device
FIG. 8 is a schematic view of an upper connecting body of the pressure overload protection device;
fig. 9 is a schematic view of the upper end cover of the pressure overload protection device.
Detailed Description
The technical solution of the present invention is further explained below with reference to the accompanying drawings, but the claimed protection scope is not limited to the above.
The utility model provides a bearing axial clearance testing machine pressure overload protection device includes: the device comprises a lower connector 1, a lower end cover 2, a barrel 3, a heavy-duty rectangular compression spring 4, a three-core plug 5, a microswitch cover 6, a hexagon socket head cap screw 7, a microswitch 8, a microswitch fixing plate 9, an upper connector 10 and an upper end cover 11.
1. Lower linker 1:
the length of the lower connecting body of the pressure overload protection device is 80mm, namely a hollow step cylinder (as shown in figure 3), wherein the left end of the lower connecting body is provided with a phi 37.8X15mm cylindrical step and a phi 64X9mm cylindrical table which are used for positioning and supporting and fixing the inner hole of the heavy-load rectangular pressure spring 4 and the end face; the right end of the cylinder of phi 64X9mm is provided with M42X2 threads with the length of 29mm, so that the installation size of the heavy-load rectangular pressure spring 4 can be conveniently adjusted; the right end is a phi 36 cylinder; the section B-B phi 10F8 hole is a positioning pin hole; the left phi 20H8X25mm hole is a cylinder barrel and forms a precise sliding fit with a phi 20f lever of the upper connector 10, so that the coaxiality requirement of the upper connector and the lower connector is met; the hole phi 20H8X30mm at the right end is used for forming precise sliding fit with the cylindrical surface of the part phi 20f of the bearing axial clearance testing machine, and the requirement of coaxiality between the parts is also met. The material is selected from 40Cr material, hardness HRC28-33, and surface chrome plating.
2. The lower end cover 2:
the size of the lower end cover 2 is that the outer circle phi 92X30mm has an inner hole of M78X2 and M42X2 cylinder type (as shown in figure 4), wherein the upper end is a threaded hole M78X2 with the length of 15mm, and the lower end is a threaded hole M42X2 with the length of 15mm, so that the lower end can be connected with the cylinder body 3 and the lower connecting body 1. The material is selected from 40Cr material, hardness HRC28-33, and surface chrome plating.
3. Barrel 3:
the size of the cylinder body 3 is the cylinder shape (shown in figure 5) of an inner hole phi 65 with the outer circle phi 78X 85mm, wherein the upper end and the lower end M78X2 are threaded holes with the length of 20mm and are used for connecting an upper end cover and a lower end cover and adjusting the compression spring and the microswitch 8, and the length of 85mm is determined according to the size of the compressed spring with the design load of the heavy-load rectangular compression spring 4. The material is selected from 40Cr material, hardness HRC28-33, and surface chrome plating.
4. Heavy-duty rectangular compression spring 4:
the heavy-duty rectangular pressure spring 4 is selected from a model TJH63-76 according to the maximum limit load 1000N (the maximum working load 2000N of a pressure sensor of a bearing axial clearance testing machine) of a pressure overload protection device, and the spring parameter is the aperture DH (mm) phi 63.0 mm; shaft diameter Dd (mm) phi 38mm, free length Lo (mm)76 mm; spring constant R (N/mm) 526.3; the compression (mm) was 15.2/8000/load (N, Kgf).
When the pressure overload protection device is set to a nominal pressure of 1000N, the pre-compression length of the spring is about 74 mm.
The maximum working stroke of the micro switch 8 is 1.9mm, and the maximum displacement of the micro switch 8 triggered to work is 0.6 mm.
When the load is more than 1000N and less than 1500N, the spring displacement is 0-1mm, the corresponding micro switch plunger also moves 0-1mm, and the micro switch triggering operation requirement is met.
Through the design calculation, the heavy-load rectangular pressure spring 4 can realize that the working load of the sensor of the tester is less than 1500N (the maximum working load of the sensor is 2000N), and the requirements of protecting the sensor and equipment are met.
5. Three-core plug 5:
the three-core plug 5 is a GX12 three-core plug, the installation hole diameter is phi 12, and the thread is M12X 1.
6. Microswitch cover 6:
the microswitch cover 6 is made of Q235 with the thickness of 2mm and is plated with chrome on the surface to protect the microswitch 8, and a phi 12.5 hole is used for mounting the three-core plug seat.
7. Hexagon socket head cap screw 7:
the inner hexagonal flat head screw 7 is GB70-76, M4X10 mm.
8. A microswitch 8:
the microswitch 8 selects VSION051C2, the pre-stroke of the plunger actuator from the free position to the working position is 1.9mm, and the safety stroke of the plunger is 0.6mm beyond the working position.
9. Microswitch fixing plate 9:
the microswitch fixing plate 9 is made of Q235 with the thickness of 2mm, is plated with chrome on the surface and is used as a microswitch cover plate, and a 28X22mm vertical plate is used for fixedly mounting the microswitch 8.
10. Upper connector 10:
the length of the upper connecting body 10 of the pressure overload protection device is 160mm and is in a multi-step cylinder shape (as shown in fig. 8), wherein the left end of the upper connecting body is a phi 20f7X45mm cylinder step which is used as a cylinder rod and forms a precise sliding fit with a phi 20H8 hole of the lower connecting body 1, so that the coaxiality requirement of the upper connecting body and the lower connecting body is met; the diameter phi 37.8X35mm cylindrical step and the diameter phi 64X8mm cylindrical table are used for positioning, supporting and fixing with the inner hole of the heavy-load rectangular pressure spring 4; the right end of the phi 64X8mm cylinder is a phi 25f7X27mm cylinder which forms a precise sliding fit with a phi 25H8 hole of the upper end cover 11, the coaxiality requirement between components is met, and a M24X1.5 mm long 13mm thread is used for fixing the upper connecting body 10 and the tester by a locking nut; the right end is a phi 20f7X32mm cylinder for connecting a tester, and the phi 10H8 hole is a positioning pin hole. The material is selected from 40Cr material, hardness HRC28-33, and surface chrome plating.
11. An upper end cover 11:
the upper end cover 11 is in the shape of a cylinder (shown in fig. 9) with an outer circle phi 92X40mm, an inner hole of which is M78X2 and phi 25H8, wherein the upper end is a threaded hole M78X 2mm long by 15mm, and the lower end is a phi 25H8 hole which forms a precise sliding fit with a phi 25f7 cylinder of the upper connector 10, so that the coaxiality requirement of the pressure overload protection device is met. The 50X31.5X2 groove is used for installing the micro switch fixing plate 9, and the 16X31.5X25 groove is used for installing the micro switch 8. The material is selected from 40Cr material, hardness HRC28-33, and surface chrome plating.
In the working process of the pressure overload protection device of the bearing axial clearance testing machine (as shown in figure 1), when the load (the pressure vertically downward along the testing machine) borne by the pressure overload protection device reaches and exceeds the preset spring stiffness (the pressure value for deforming the pressure spring) of the heavy-load rectangular pressure spring 4 in the device, the heavy-load rectangular pressure spring 4 generates compression deformation (the spring stiffness is determined according to the working requirement of the testing machine even if the heavy-load rectangular compression deformation pressure is determined, the spring deformation pressure of the pressure overload protection device is set to be 1000N), so that the upper connecting body 10 component generates downward displacement along with the heavy-load rectangular pressure spring 4 (as shown in figure 2), the contact surface of the upper connecting body 10 component and the plunger of the microswitch 8 deviates downward, the plunger of the microswitch 8 moves from the compressed position to the reset position, the microswitch 8 plunger drives the execution element, when the contact point of the microswitch 8 execution element moves, the microswitch 8 cuts off the working power supply of the load (pressure) of the testing machine, so that the bearing axial clearance testing machine stops applying the load (pressure), and the purpose of pressure overload protection of the bearing axial clearance testing machine is achieved.
Through the analysis of the working principle, the invention designs the pressure overload protection device of the bearing axial clearance testing machine (as shown in figure 2). According to the working characteristics of the heavy-load rectangular pressure spring 4, namely when the heavy-load rectangular pressure spring 4 reaches a certain pressure (the spring stiffness is the pressure value for deforming the pressure spring), the spring is compressed and deformed to generate displacement, and the displacement can be used for cutting off a power supply by using the microswitch 8. The device is arranged between the pressure sensor of the bearing axial clearance testing machine and the tested bearing and is used for timely cutting off the feeding power supply of the bearing axial clearance testing machine when the pressure of the tested medium is higher than the set pressure value of the pressure overload protection device, so that the sensor of the bearing axial clearance testing machine is protected from being damaged due to overpressure, and when the tested pressure is lower than the set value, the sensor can be switched on to enable the bearing axial clearance testing machine to be in a working state of normally displaying the pressure of the tested medium, the work is stable and reliable, and the use requirement is well met.
In order to ensure that the pressure overload protection device has good coaxiality and reduce measurement errors in structural design, the upper connecting body 10 and the lower connecting body 11 are in precise sliding clearance fit (phi 20H8/f7) by adopting a lever and a cylinder barrel in a phi 20 shaft hole. The shaft and hole phi 25 of the upper connecting body 10 and the upper end cover 11 are also in precise sliding clearance fit (phi 25H8/f 7). In order to facilitate the adjustment of the compression amount of the spring and the accurate control of the stroke position of the microswitch 8, the upper end cover and the lower end cover are in threaded connection, so that the spring is convenient to mount and adjust.
Claims (4)
1. The utility model provides a bearing axial clearance testing machine pressure overload protection device which characterized in that: the overload protection device is arranged between the pressure sensor of the bearing axial clearance testing machine and the tested bearing and comprises a microswitch (8) and a trigger piece for triggering the microswitch;
the axis of the trigger piece is coincident with the load direction of the bearing axial clearance testing machine and comprises a barrel body (3), an upper end cover (11) and a lower end cover (2) are detachably connected to two ends of the barrel body (3) respectively, the upper end cover (11) is connected with a microswitch (8), a lower connecting body (1) is arranged in the barrel body (3), one end of the lower connecting body (1) is slidably connected with an upper connecting body (10) used for triggering the microswitch (8), the outer side of the upper connecting body (10) is heavily loaded, and a rectangular pressure spring (4) is arranged in the barrel body (3);
the cylinder body (3) is a hollow cylindrical pipe, and the upper end and the lower end of the outer surface of the cylinder body are provided with threads;
the upper connector (10) is a step-shaped cylinder and comprises a first cylindrical section, a second cylindrical section, a third cylindrical section, a fourth cylindrical section, a fifth cylindrical section and a sixth cylindrical section, wherein the first cylindrical section is in sliding connection with the lower connector (1), the second cylindrical section is used for positioning in the cylinder body (3), the third cylindrical section is used for being connected with the heavy-duty rectangular pressure spring (4), the fourth cylindrical section is used for being matched with the upper end cover (11), the fifth cylindrical section and the sixth cylindrical section are used for being connected with the bearing axial clearance testing machine, threads are arranged on the outer surface of the fifth cylindrical section, and a positioning bolt hole is formed in the;
the lower connecting body (1) is a hollow step cylinder, and comprises a seventh cylindrical section connected with a heavy-load rectangular pressure spring (4), an eighth cylindrical section used for positioning in the cylinder body (3), a ninth cylindrical section connected with the lower end cover (2) and a tenth cylindrical section connected with the bearing axial clearance testing machine.
2. The pressure overload protection device of the bearing axial clearance testing machine according to claim 1, wherein: the microswitch (8) is connected with the upper end cover (11) through a microswitch fixing plate (9), the microswitch fixing plate (9) is connected with the microswitch cover (6) through an inner hexagonal flat head screw (7), and the microswitch cover (6) is provided with a three-core plug (5).
3. The pressure overload protection device of the bearing axial clearance testing machine according to claim 1, wherein: the upper end of the upper end cover (11) is provided with a threaded hole, the lower end of the threaded hole is provided with a circular through hole, and the upper end surface of the upper end cover (11) is also provided with a groove.
4. The pressure overload protection device of the bearing axial clearance testing machine according to claim 1, wherein: the lower end cover (2) is provided with a stepped threaded hole which penetrates through the upper end surface and the lower end surface of the lower end cover and has different outer diameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811384154.XA CN109586247B (en) | 2018-11-20 | 2018-11-20 | Pressure overload protection device of bearing axial clearance testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811384154.XA CN109586247B (en) | 2018-11-20 | 2018-11-20 | Pressure overload protection device of bearing axial clearance testing machine |
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| Publication Number | Publication Date |
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| CN109586247A CN109586247A (en) | 2019-04-05 |
| CN109586247B true CN109586247B (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811384154.XA Active CN109586247B (en) | 2018-11-20 | 2018-11-20 | Pressure overload protection device of bearing axial clearance testing machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113848053B (en) * | 2021-11-26 | 2022-06-14 | 济南凯镭迪精密仪器有限公司 | Spring is pressed and is tested overload protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102086695A (en) * | 2009-12-08 | 2011-06-08 | 无锡华科机械设备有限公司 | Overload protection device |
| CN202897857U (en) * | 2012-10-25 | 2013-04-24 | 南京晨光集团有限责任公司 | Overload and load-loss protecting device |
| CN206485778U (en) * | 2017-01-13 | 2017-09-12 | 遵义市遵云制冷配件有限公司 | A kind of protector for sensor |
| CN106926511B (en) * | 2017-05-11 | 2018-06-29 | 荣成华东锻压机床股份有限公司 | The protection of mechanical press electromechanical overload and stretching device and method |
| CN108380786B (en) * | 2018-04-12 | 2024-01-19 | 青岛理工大学 | Intelligent overload protection device of press and control method |
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