CN108955976B - Method for measuring friction force of spring sleeve - Google Patents
Method for measuring friction force of spring sleeve Download PDFInfo
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- CN108955976B CN108955976B CN201810340304.0A CN201810340304A CN108955976B CN 108955976 B CN108955976 B CN 108955976B CN 201810340304 A CN201810340304 A CN 201810340304A CN 108955976 B CN108955976 B CN 108955976B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0057—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to spring-shaped elements
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Abstract
A method for measuring the friction force of spring sleeve features that the spring sleeve is gradually pulled out by a little bit under the test condition close to actual use condition. The running-in and reasonable pull rod moving speed are adopted, so that the testing accuracy of the friction force of the spring sleeve is improved, the improvement and the guarantee of the product quality are facilitated, the production and the manufacture are facilitated, and the unnecessary loss is avoided. The invention has the characteristics of reasonable structure, convenient use, accurate test and the like, and can meet the requirements of the friction force test and the quality evaluation of the spring housing.
Description
Technical Field
The invention relates to the field of airplane wheel brake devices, in particular to a friction force measuring method for a spring sleeve of an automatic gap adjusting mechanism of an airplane wheel brake device.
Background
In order to meet the brake performance requirements of modern airplanes, the aircraft wheel brake device is provided with an automatic clearance adjusting mechanism. The function is that after the aircraft lands and brakes for a plurality of times, the distance between the piston and the pressing disc is increased due to the abrasion of the brake friction material. In order to ensure the braking performance and improve the braking sensitivity, the mechanism can automatically compensate the stroke change caused by the abrasion of the brake disc, so that the working clearance between the operating piston and the pressing disc meets the specified requirement. The spring sleeve is an automatic clearance adjusting mechanism element and is matched with the pull rod for use. The spring sleeve is sleeved on the pull rod in a pressing mode, and a friction pair is formed at the joint of the spring sleeve and the pull rod. The spring sleeve type automatic clearance adjusting mechanism is simple in structure and reliable in use, and is a structural type mainly applied to a disc brake wheel. When the clearance adjusting mechanism is not started, the spring sleeve and the pull rod do not have relative displacement, and the spring sleeve clamps the pull rod; when the gap adjusting mechanism is started, the pull rod is pulled out from the spring sleeve by overcoming the friction force (also called clamping force and wrapping force) of the spring sleeve, namely the spring sleeve and the pull rod are relatively displaced. After the brake is released, the spring sleeve is positioned at a new position on the pull rod, and the piston is reset according to a new reference, so that the compression ring and the piston correspondingly extend out a little more than before the gap is adjusted, and the brake gap is ensured to be unchanged in use. Meanwhile, the piston stroke can be controlled, and the brake sensitivity is improved. The spring sleeve is a key part of the automatic clearance adjusting mechanism, and the friction force and stability of the spring sleeve determine the running performance and reliability of the automatic clearance adjusting mechanism. The friction force of the spring sleeve must meet the requirements of technical conditions, and the purpose of automatic gap adjustment cannot be realized when the friction force is too large or too small. The measurement of the friction force of the spring sleeve is a direct and effective means for judging the technical performance of the spring sleeve part and is also an important link for ensuring the technical quality and performance of the aircraft wheel product. Therefore, a pull-out friction force measurement test is required for each spring case produced in each batch. The existing measuring method has the main defect that the test condition cannot truly reflect or better simulate the use condition of the spring sleeve. In practical use, the spring sleeve is gradually pulled out from the fixed end of the draw rod head to the draw rod head, the force measurement test is to pull the spring sleeve to the bottom once, namely, the spring sleeve moves to the working stroke section of the draw rod once, and in addition, the moving speed of the draw rod is overhigh. Some parts that are otherwise unacceptable may be judged as acceptable or some parts that are otherwise acceptable may be judged as unacceptable. The looseness fault of the spring sleeve, which occurs in the assembly test and the use, is worth to find out the accuracy of the measurement result of the friction force of the spring sleeve besides the manufacturing factors of parts.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for measuring the friction force of a spring sleeve.
The specific process of the invention is as follows:
installing the spring sleeve-pull rod assembly on a tensile machine, fixing the spring sleeve, pushing and pulling the pull rod to move, so that the spring sleeve and the pull rod generate relative displacement, and performing a drawing running-in test; the running-in test parameters are: moving speed of the pull rod: 130-300 mm/min; the moving stroke of the pull rod is as follows: is greater than or equal to the length of the working stroke section of the pull rod.
The spring sleeve-pull rod assembly is obtained by pressing and sleeving a spring sleeve to be tested on a pull rod.
The specific process of the drawing running-in test is as follows:
when the end face of the spring sleeve is 5-8 mm away from the assembly position of the pull rod head:
i, pulling out a spring sleeve from an assembly position to a position flush with a pull rod head at one time, or pushing and pressing the spring sleeve to move to the assembly position from the position where the pull rod head is flush with the spring sleeve at one time, so that the pull rod extends out of the spring sleeve by a length;
II, pushing the pull rod to move from the position where the spring sleeve is flush with the pull rod head, so that the spring sleeve returns to the assembling position.
The above is a push-pull process. And repeating the push-pull process for 25-45 times. And finishing the drawing and grinding of the spring sleeve and the pull rod.
and cleaning the worn-in spring sleeve, and removing abrasive dust and dirt between the inner hole of the spring sleeve and the spring wire.
And step 3, testing:
replacing the pull rod used in the running-in test; and (3) pressing and sleeving the cleaned spring sleeve on a new pull rod, and enabling the upper end face of the spring sleeve to be at an assembly position which is 10mm away from the pull rod head, or enabling the end face of the spring sleeve to be flush with the pull rod head. And lubricating grease or hydraulic oil is coated on the matching surfaces of the pull rod and the spring sleeve. A new spring pocket-drawbar assembly is obtained.
Replacing the pull rod used in the running-in test; and (3) pressing and sleeving the cleaned spring sleeve on a new pull rod, and enabling the upper end face of the spring sleeve to be 10mm away from the assembly position of the pull rod head, or enabling the end face of the spring sleeve to be flush with the pull rod head. And lubricating grease or hydraulic oil is coated on the matching surfaces of the pull rod and the spring sleeve. A new spring pocket-drawbar assembly is obtained.
And (3) mounting the obtained new spring sleeve-pull rod assembly on a tensile machine, fixing the spring sleeve, pushing and pulling the pull rod to move so that the spring sleeve and the pull rod generate relative displacement, and placing the spring sleeve and the pull rod in an oil box for a friction force measurement test.
To calibrate the test system, 1-2 pretests are performed.
Force measurement test parameters: the moving speed of the pull rod is 30-60 mm/min;
in a force measurement test, the movement distance of each step is 1.5-3 mm when the movement stroke of the pull rod is gradually tested little by little in the working stroke section of the pull rod until the overhanging pull rod head is flush with the end face of the spring sleeve, namely the pull rod moves through the working stroke section on the spring sleeve; the course of this pulling movement is a test stroke. After the pull rod is pulled to move for testing, pushing and pressing the pull rod according to the pull rod pulling method for further moving testing; the course of this pushing movement is a test stroke. The above is a push-pull process. Repeating the pulling and pushing processes for 3-5 times. In each test stroke, when the pull rod moves a distance under the action of pulling or pushing, a friction force is generated, the load sensor on the pulling machine transmits the output pulling load or pushing load to the computer, and the computer acquires load data in real time through A/D conversion, wherein the sampling period is 2-10 ms. And comparing the obtained load data by the computer to obtain a maximum load value, wherein the maximum load value is the friction force pulled out by the spring sleeve.
And 4, evaluating. And (4) comparing the friction force measurement test result obtained in the step (3) with a qualified criterion to obtain a conclusion whether the friction force of the spring sleeve is qualified.
The qualification criterion is that the friction force of the spring sleeve reaches the specified value in 2 continuous force measuring cycles; the cycle of pulling and pushing is 1 time, and the friction force of the spring sleeve reaches the specified value and is considered to be qualified; and (4) according to the force measurement test result, the friction force of the spring sleeve reaches a specified value according to the 2 nd-3 rd pulling-presumed force cycle value, and the conclusion is that the friction force of the spring sleeve is qualified.
The test fixture comprises an upper chuck and a lower chuck. The upper chuck is fixedly connected with a movable beam of the tensile machine through a movable rod, and the lower chuck is fixedly connected with the base.
The bottom plate of the upper chuck is provided with a T-shaped groove, the bottom of the T-shaped groove is semicircular, and the circle center of the semicircle coincides with the geometric center of the box-shaped part bottom plate. The width of the T-shaped groove is slightly larger than the diameter of the nail head of the pull rod and the diameter of the polish rod of the pull rod, so that the nail head and the polish rod of the pull rod can be partially and slidably installed. The geometric center of the upper surface of the top plate of the box-shaped part is provided with a short column which extends out and is used for being connected and fixed with the moving beam acting rod. A rigid cushion block is arranged inside the upper chuck to transmit pushing force to the pull rod. The upper chuck is used for clamping and fixing the pull rod and transmitting force and motion to the pull rod. The top plate of the lower chuck is provided with a groove, the bottom of the groove is semicircular, and the circle center of the semicircle coincides with the geometric center of the top plate of the box-shaped piece. The width of the groove is slightly larger than the diameter of the polish rod of the pull rod, so that the polish rod part of the pull rod can be installed in a sliding mode. The geometric center of the lower surface of the box-shaped part bottom plate is provided with a short column which extends out and is used for being connected and fixed with a base of a tensile machine. Two semi-cylindrical half cushion blocks are arranged in the box-shaped part, and the two semi-cylindrical half cushion blocks are spliced to form a cylindrical cushion block. The center of the cushion block formed by splicing is provided with a through hole in clearance fit with the pull rod. The upper surface of the cushion block supports the spring sleeve to provide thrust for the push pull rod.
And hydraulic oil for the test of the spring sleeve is filled in the lower chuck.
The test conditions of the invention are very close to the actual use condition, and the spring sleeve is gradually pulled out little by little. The running-in and reasonable pull rod moving speed are adopted, so that the testing accuracy of the friction force of the spring sleeve is improved, the improvement and the guarantee of the product quality are facilitated, the production and the manufacture are facilitated, and the unnecessary loss is avoided. The invention has the characteristics of reasonable structure, convenient use, accurate test and the like, and can meet the requirements of the friction force test and the quality evaluation of the spring housing.
Drawings
FIG. 1 is a flow chart of the spring case friction test of the present invention;
FIG. 2 is a diagram of a test fixture of the present invention. In the figure:
1, mounting a chuck; 2, lower clamping head; 3 a first cushion block; 4 second cushion block.
Detailed Description
The embodiment is a method for measuring the friction force of the spring housing, and is implemented by an existing spring housing friction force testing system. Spring housing frictional force test system includes: tensile machine, test fixture and computer.
The pulling force machine for including base, servo motor, speed governing reduction gear, ball, movable beam, load sensor, displacement sensor and control panel, wherein: the servo motor and the speed regulation reducer are arranged in the base and are used for driving and driving the ball screw according to the required speed so as to drive the movable cross beam to move up and down; the ball screw is vertically fixed on the side surface of the base; the movable cross beam is mechanically connected with the ball screw and can move up and down along with the rotation of the ball screw; the control panel is located on the ball screw upright post and used for manual operation tests.
And the ball screw upright post is vertically fixed with a steel plate ruler and a position switch for adjusting the stroke of the movable beam.
The load sensor is arranged in the end head of the moving beam moving rod and is used for detecting the load applied by the push-pull rod, namely the friction force between the spring sleeve and the pull rod; the electrical signal generated by the load cell is supplied to the computer by a wire.
The displacement sensor is arranged on the movable cross beam or is arranged in the servo motor and is used for measuring the displacement of the push-pull rod.
The specific process of this embodiment is:
Mounting the obtained spring sleeve-pull rod assembly on a tensile machine, fixing the spring sleeve, pushing and pulling the pull rod to move so that the spring sleeve and the pull rod generate relative displacement, and performing a drawing running-in test; the running-in test parameters are: moving speed of the pull rod: 130-300 mm/min; the moving stroke of the pull rod is as follows: is greater than or equal to the length of the working stroke section of the pull rod. The working stroke section of the pull rod is determined by the automatic gap adjusting mechanism where the pull rod is located.
The specific process of the drawing running-in test is as follows:
when the outer end face of the spring sleeve is located at a primary installation position 5-8 mm away from the end face of the pull rod head:
i, pulling the spring sleeve to be flush with the pull rod head at one time, pushing the spring sleeve at one time, moving the inner end face of the spring sleeve to the starting end of the working stroke section of the pull rod, and extending the pull rod out of the spring sleeve;
II, pushing the pull rod to move from the position where the spring sleeve is flush with the pull rod head, so that the spring sleeve returns to the assembling position.
The above is a push and pull process. And repeating the pushing and pulling processes for 25-45 times. And finishing the drawing and grinding of the spring sleeve and the pull rod.
In this embodiment, the distance between the end face of the spring sleeve and the assembly position of the tie rod head is 8 mm.
The general regulation requires that the matching surfaces of parts in the pneumatic brake are coated with lubricating grease, and hydraulic oil is coated in the hydraulic brake and is put in the oil for testing. In the embodiment, the hydraulic brake works in oil, the matching surface of the pull rod and the spring sleeve is coated with hydraulic oil according to requirements and is placed in the oil for testing; a press machine and a press tool are adopted to press and sleeve the spring sleeve on the pull rod, the spring sleeve is positioned at a position close to the pull rod head, and the pull rod head extends out of the spring sleeve; running-in test parameters: pulling and pressing movement speed: 250 mm/min; the moving stroke of the pull rod is as follows: pulling to the position once; running-in test times: pull out and push in the pull rod 35 times each;
and 2, cleaning. Cleaning the ground spring sleeve, and removing abrasive dust and dirt between the inner hole of the spring sleeve and the spring wire;
the cleaning method comprises manual brushing, mechanical vibration and ultrasonic cleaning.
In the embodiment, manual soaking and scrubbing are adopted; the spring sleeve is firstly put into gasoline for soaking, tweezers are used for clamping the spring sleeve and shaking for several times, and a brush is used for removing dirt on an inner hole and an outer circle after a running-in test of the spring sleeve.
And 3, testing.
Replacing the pull rod used in the running-in test; and (3) pressing and sleeving the cleaned spring sleeve on a new pull rod, and enabling the upper end face of the spring sleeve to be at an assembly position which is 10mm away from the pull rod head, or enabling the end face of the spring sleeve to be flush with the pull rod head. And lubricating grease or hydraulic oil is coated on the matching surfaces of the pull rod and the spring sleeve. The spring housing-drawbar assembly is obtained.
And (3) mounting the obtained spring sleeve-pull rod assembly on a tensile machine, fixing the spring sleeve, pushing and pulling the pull rod to move so that the spring sleeve and the pull rod generate relative displacement, and placing the spring sleeve-pull rod assembly in an oil box for a friction force measurement test.
To calibrate the test system, 1-2 pretests are performed.
Force measurement test parameters: the moving speed of the pull rod is 30-60 mm/min;
the pull rod moving stroke is a pull rod moving test in which the pull rod moves little by little in the pull rod working stroke section, the moving distance of each step is 1.5-3 mm until the overhanging pull rod head is flush with the end face of the spring sleeve, namely the pull rod moves through the working stroke section on the spring sleeve; the course of this pulling movement is a test stroke. After the pull rod is pulled to move and tested, pushing and pressing the pull rod according to the pull rod pulling method and then carrying out the push and pressing pull rod movement test; the course of this pushing movement is a test stroke. The above is a push-pull process. Repeating the pulling and pushing processes for 3-5 times. In each test stroke, when the pull rod moves a distance under the action of pulling or pushing, a friction force is generated, the load sensor on the pulling machine transmits the output pulling load or pushing load to the computer, and the computer acquires load data in real time through A/D conversion, wherein the sampling period is 2-10 ms. And comparing the obtained load data by the computer to obtain a maximum load value, wherein the maximum load value is the friction force pulled out by the spring sleeve.
The computer is used for collecting signals sent by the sensor, controlling the movement displacement of the pull rod during automatic test, outputting a friction force test result, and displaying, storing or printing on a screen; the computer includes application software.
In this example, the force measurement test parameters were: moving speed of the pull rod: 45mm/min, measuring stroke: gradually pulling or pushing the pull rod to move for testing in the working stroke section of the pull rod, wherein each step is 2mm until the working stroke section of the pull rod is finished; the times of the force measurement test: the pull rod is pulled out 4 times and pushed in 4 times.
And 4, evaluating. And (4) comparing the friction force measurement test result obtained in the step (3) with a qualified criterion provided by the technical requirements, and obtaining a conclusion whether the friction force of the spring sleeve is qualified.
In the embodiment, the qualified criterion is that the friction force of the spring sleeve reaches a specified value in 2 continuous force measuring cycles; the process of pulling and pushing is a cycle, and the friction force of the spring sleeve reaches a specified value and is considered to be qualified; and (4) according to the force measurement test result, the friction force of the spring sleeve reaches a specified value according to the 2 nd-3 rd pulling-presumed force cycle value, and the conclusion is that the friction force of the spring sleeve is qualified.
The tensile machine used in this embodiment is prior art.
The test fixture comprises an upper clamp 1 and a lower clamp 2. The upper chuck 1 is fixedly connected with a movable beam of the tensile machine through a movable rod, and the lower chuck 2 is fixedly connected with the base.
The upper chuck 1 is an open box-shaped piece, a bottom plate of the open box-shaped piece is provided with a T-shaped groove, the bottom of the T-shaped groove is semicircular, and the circle center of the semicircle coincides with the geometric center of the bottom plate of the box-shaped piece. The width of the T-shaped groove is slightly larger than the nail head diameter of the pull rod and the polish rod diameter of the pull rod, so that the nail head and the polish rod of the pull rod are partially and slidably installed. The geometric center of the upper surface of the top plate of the box-shaped part is provided with a short column which extends out and is used for being connected and fixed with the moving beam acting rod. Inside the upper jaw there is a rigid pad 3 to transmit the pushing force to the tie rod. The upper chuck is used for clamping and fixing the pull rod and transmitting force and motion to the pull rod.
The lower chuck 2 is also an open box-shaped piece, a groove is formed on the top plate, the bottom of the groove is semicircular, and the circle center of the semicircle coincides with the geometric center of the top plate of the box-shaped piece. The width of the groove is slightly larger than the diameter of the polish rod of the pull rod, so that the polish rod part of the pull rod can be installed in a sliding mode. The geometric center of the lower surface of the box-shaped part bottom plate is provided with a short column which extends out and is used for being connected and fixed with a base of a tensile machine. Two semi-cylindrical half cushion blocks 4 are arranged in the box-shaped part, and the two semi-cylindrical half cushion blocks are spliced to form a cylindrical cushion block. The center of the cushion block formed by splicing is provided with a through hole in clearance fit with the pull rod. The upper surface of the cushion block supports the spring sleeve to provide thrust for the push pull rod.
The lower chuck 2 is used for clamping and fixing the spring sleeve, so that the purposes of force transmission and motion transmission of the pull rod are achieved;
the belt pull rod-spring sleeve assembly is installed from the side of the box-shaped piece and then fixes and seals the side plates. And hydraulic oil is filled in the lower chuck 2 for testing the spring sleeve. In FIG. 2, the pull rod-spring sleeve assembly is shown in phantom; the arrows indicate that the upper jaw 1 pushes or pulls the pull rod in the up-down direction.
Claims (6)
1. A method for measuring the friction force of a spring sleeve is characterized by comprising the following specific steps:
step 1, running-in:
installing the spring sleeve-pull rod assembly on a tensile machine, fixing the spring sleeve, pushing and pulling the pull rod to move, so that the spring sleeve and the pull rod generate relative displacement, and performing a drawing running-in test; the running-in test parameters are: moving speed of the pull rod: 130-300 mm/min; the moving stroke of the pull rod is as follows: the length of the working stroke section of the pull rod is greater than or equal to the length of the working stroke section of the pull rod;
step 2, cleaning:
cleaning the ground spring sleeve, and removing abrasive dust and dirt between the inner hole of the spring sleeve and the spring wire;
and step 3, testing:
replacing the pull rod used in the running-in test; pressing and sleeving the cleaned spring sleeve on a newly replaced pull rod, and enabling the upper end face of the spring sleeve to be 5-8 mm away from the assembly position of the pull rod head, or enabling the end face of the spring sleeve to be flush with the pull rod head; coating lubricating grease or hydraulic oil on the matching surfaces of the pull rod and the spring sleeve; obtaining a new spring housing-drawbar assembly;
installing the obtained new spring sleeve-pull rod assembly on a tensile machine, fixing the spring sleeve, pushing and pulling the pull rod to move so that the spring sleeve and the pull rod generate relative displacement, and placing the spring sleeve-pull rod assembly in an oil box to perform a friction force measuring test;
performing 1-2 times of pretests for adjusting a test system;
force measurement test parameters: the moving speed of the pull rod is 30-60 mm/min;
in a force measurement test, the movement distance of each step is 1.5-3 mm when the movement stroke of the pull rod is gradually tested little by little in the working stroke section of the pull rod until the overhanging pull rod head is flush with the end face of the spring sleeve, namely the pull rod moves through the working stroke section on the spring sleeve; the process of the pulling movement is a test stroke; after the pull rod is pulled to move and tested, pushing and pressing the pull rod according to the pull rod pulling method and then carrying out the push and pressing pull rod movement test; the pushing movement is performed in a test stroke; the above is a push-pull process; repeating the pulling and pushing processes for 3-5 times; in each test stroke, when the pull rod moves for a distance under the action of pulling or pushing, a friction force is generated, a load sensor on the pulling machine transmits an output pulling load or pushing load to a computer, and the computer collects load data in real time through A/D conversion, wherein the sampling period is 2-10 ms; the computer compares the obtained load data to obtain a maximum load value, and the maximum load value is the friction force pulled out by the spring sleeve;
step 4, evaluating; comparing the friction force measurement test result obtained in the step 3 with a qualified criterion to obtain a conclusion whether the friction force of the spring sleeve is qualified or not;
the qualified criterion is that the friction force of the spring sleeve reaches a specified value in 2 continuous force measuring cycles; the process of pulling and pushing is a cycle, and the friction force of the spring sleeve reaches a specified value and is considered to be qualified; and (4) according to the force measurement test result, the friction force of the spring sleeve reaches a specified value according to the 2 nd-3 rd pulling-presumed force cycle value, and the conclusion is that the friction force of the spring sleeve is qualified.
2. The method for measuring the friction force of the spring housing as claimed in claim 1, wherein the spring housing-pull rod assembly is obtained by pressing the spring housing to be measured on the pull rod; and an assembly distance of 5mm is reserved between the spring sleeve and the pull rod head.
3. The method for measuring the friction force of the spring sleeve as claimed in claim 1, wherein the specific process of the drawing running-in test is as follows:
when the end face of the spring sleeve is 5-8 mm away from the assembly position of the pull rod head:
i, pulling out a spring sleeve from an assembly position to a position flush with a pull rod head at one time, or pushing and pressing the spring sleeve to move to the assembly position from the position where the pull rod head is flush with the spring sleeve at one time, so that the pull rod extends out of the spring sleeve by a length;
II, pushing the pull rod to move from the position where the spring sleeve is flush with the pull rod head, so that the spring sleeve returns to the assembling position;
the above is a push and pull process; repeating the pushing and pulling processes for 25-45 times; and finishing the drawing and grinding of the spring sleeve and the pull rod.
4. The method for measuring the friction force of the spring housing according to claim 1, wherein the test fixture comprises an upper chuck and a lower chuck; the upper chuck is fixedly connected with a movable beam of the tensile machine through a movable rod, and the lower chuck is fixedly connected with the base.
5. The method for measuring the frictional force of a spring case according to claim 4, wherein the bottom plate of the upper collet has a T-shaped groove, the bottom of the T-shaped groove is a semicircle, and the center of the semicircle coincides with the geometric center of the bottom plate of the box-shaped member; the width of the T-shaped groove is slightly larger than the diameter of the nail head of the pull rod and the diameter of the polished rod of the pull rod, so that the nail head and the polished rod of the pull rod can be partially installed in a sliding mode; the geometric center of the upper surface of the top plate of the box-shaped part is provided with a short column which extends out and is used for being connected and fixed with the movable beam acting rod; a rigid cushion block is arranged in the upper chuck to transmit pushing force to the pull rod; the upper chuck is used for clamping and fixing the pull rod and transferring force and motion to the pull rod; a groove is formed in the top plate of the lower chuck, the bottom of the groove is semicircular, and the circle center of the semicircle is superposed with the geometric center of the box-shaped piece top plate; the width of the groove is slightly larger than the diameter of the polish rod of the pull rod, so that the polish rod part of the pull rod can be installed in a sliding mode; the geometric center of the lower surface of the box-shaped part bottom plate is provided with an extended short column which is used for being connected and fixed with a base of a tensile machine; two semi-cylindrical half cushion blocks are arranged in the box-shaped part, and the two semi-cylindrical half cushion blocks are spliced to form a cylindrical cushion block; the center of the cushion block formed by splicing is provided with a through hole in clearance fit with the pull rod; the upper surface of the cushion block supports the spring sleeve to provide thrust for the push pull rod.
6. The method for measuring the frictional force of a spring housing according to claim 4, wherein the lower cartridge is filled with hydraulic oil for the test of the spring housing.
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| CN103202734A (en) * | 2013-04-18 | 2013-07-17 | 东南大学 | Friction test experiment table of orthodontic appliance |
| CN104061261A (en) * | 2014-05-27 | 2014-09-24 | 西安航空制动科技有限公司 | Automatic interval-adjusting force-restoring mechanism |
| CN104316244A (en) * | 2014-10-28 | 2015-01-28 | 重庆御捷汽车部件有限公司 | Device for testing reset force of reset spring of parking stay rope |
| CN104359676A (en) * | 2014-11-11 | 2015-02-18 | 上海理工大学 | Thrust bearing experiment table |
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