Testing device and testing method for axial clearance error of buffer damper

Abstract

The invention relates to a testing device and a testing method for an axial clearance error of a buffer damper. The testing device is characterized in that a positioning, supporting and pressing mechanism comprises a base, and a head seat, a guide supporting seat, a supporting seat II and a supporting seat I which are fixedly arranged at the upper end of the base in sequence; semi-arc-shaped supporting surfaces at the upper ends of the supporting seat II and the supporting seat I are used for horizontally supporting the buffer damper; a head end positioning baffle plate of the end part positioning and pressing part is fixed on the right side of the supporting seat II and is in contact positioning with the right end surface of an outer cylinder assembly of the buffer damper; a tail end positioning and pressing mechanism of the end part positioning and pressing part is in threaded connection with the upper part of the tailstock, and the right end of the tail end positioning and pressing part is in pressing contact with the left end surface of an outer cylinder assembly of the buffer damper; the power mechanism comprises an adapter, a moving cylinder assembly and an electric stretcher which are connected in sequence; the moving cylinder assembly is installed in a horizontal guide round hole in the guide support, the left end of the adapter is fixedly connected with a shaft sleeve at the head end of the buffering pre-tightening core assembly, and the electric stretcher is fixedly installed on the left side of the head seat. According to the invention, accurate quantitative detection of the axial clearance error of the buffer damper is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a testing device and a testing method for an axial clearance error of a buffer damper. Background Art

[0002] The internal structure of the buffer damper 3 is composed of a buffer preload core component 3-1 and an outer cylinder component 3-2. The design requirement is that the buffer preload core component fits tightly axially in the outer cylinder component without clearance movement. The two end planes of the buffer preload core component are in full contact with the two end surfaces of the cylindrical inner cavity composed of the outer cylinder component. However, the errors of the parts that make up the structure and the accumulated dimension chain make it easy for the buffer preload core component to produce a small amount of movement. The existing experience in checking the axial clearance error is difficult to ensure the inspection effect. Even if the phenomenon of movement is detected, the amount of movement cannot be detected, and the quality of the equipment cannot be guaranteed. Without data support, there is no persuasiveness. In order to quantify data indicators and standardize the detection process methods, a data-expressed quantifiable axial clearance test process device and test method are developed to determine whether the axial clearance error of the buffer damper assembly meets the design indicator requirements, meet the design requirements, improve quality awareness and reduce quality risks. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a testing device and a testing method for the axial clearance error of a buffer damper.

[0004] One of the above objects of the present invention is achieved by the following technical solution:

[0005] A device for measuring the axial clearance error of a buffer damper, comprising a positioning support clamping mechanism, a power mechanism and a displacement measuring part; the positioning support clamping mechanism comprises a base, a tail seat, a support seat 1, a support seat 2, a guide support seat and a head seat; the base is arranged at the lowest position, and the head seat, the guide support seat, the support seat 2, the support seat 1 and the tail seat are all vertical seats, and are fixedly installed on the upper end of the base in sequence from right to left at a set interval; the upper ends of the support seat 2 and the support seat 1 are provided with semicircular support surfaces that are consistent with the outer surface shape of the outer cylinder assembly of the buffer damper, and the horizontal support of the buffer damper is achieved through the two semicircular support surfaces; the upper end of the guide support is provided with a horizontal guide circular hole along the left and right directions;

[0006] The end positioning and clamping part includes a head end positioning baffle and a tail end positioning and clamping mechanism; the head end positioning baffle is fixed to the right side of the second support seat, and is used to form a positioning match with the right end surface of the outer cylinder assembly of the buffer damper through contact, and allows the head end sleeve of the buffer preload core assembly to extend; the tail end positioning and clamping mechanism is threadedly connected to the upper part of the tail seat, and its right end is pressed and contacted with the left end surface of the outer cylinder assembly of the buffer damper to achieve axial limitation of the outer cylinder assembly of the buffer damper;

[0007] The power mechanism includes an adapter, a movable cylinder assembly and an electric stretcher; the movable cylinder assembly is installed in a horizontal guide circular hole on the guide support in a manner that it can be moved in the left and right directions, the movable cylinder assembly is connected between the right end of the adapter and the working end of the electric stretcher, the left end of the adapter is fixedly connected to the head end sleeve of the buffer preload core assembly, and the electric stretcher is fixedly installed on the left side of the head seat.

[0008] Moreover, the tail end positioning and clamping mechanism includes an operating screw, a ball journal, a ball pressure cover, a ball seat and a clamping plate; the operating screw is connected to the threaded hole on the tail seat, the right end of the operating screw is fixedly connected to the left end of the ball journal, and the right end of the ball journal is provided with a ball head; the ball head is rotatably embedded in the ball socket formed by the connection of the ball pressure cover and the ball seat, the right end of the ball seat is connected to the clamping plate, and the left end surface of the outer cylinder assembly of the buffer damper is pressed together through the clamping plate.

[0009] Moreover, the movable cylinder assembly is composed of a cylinder body, two guide sleeves, a compression spring, a core shaft, an end cover, and a compression nut; the cylinder body is a columnar cylinder body with a limited position surface inside the left end and an internal thread on the right end; the core shaft is an axial structure with a large-diameter end on the left end, a small-diameter external thread on the right end, and an optical axis in the middle body; the guide sleeve is a column sleeve with a center hole and an annular cavity on the periphery. The end cover is a disc-shaped cover with a center hole inside and an external thread on the outer ring;

[0010] The core shaft is installed in the inner hole of the cylinder body in a way that the right end extends out, and the two guide sleeves are sleeved on the core shaft at positions close to the two ends with their openings facing each other. The compression spring is sleeved on the core shaft, and the two ends of the compression spring are respectively embedded in the annular cavities on the two guide sleeves; the end cover is connected to the internal thread at the right end of the cylinder body through an external thread, and the end cover is pressed and contacted with the right port of the guide sleeve at the right end, so that the guide sleeve at the left end is pressed and contacted with the limiting surface at the left end of the cylinder body; the clamping nut is threadedly connected to the external thread section at the right end of the core shaft, and is pressed and contacted with the right end face of the guide sleeve at the right end, so that the end head of the core shaft is pressed and contacted with the left end face of the guide sleeve at the left end.

[0011] The second objective of the present invention is achieved through the following technical solution.

[0012] A measurement method using the above-mentioned device for measuring the axial clearance error of a buffer damper comprises the following steps:

[0013] Step 1: First, install the buffer damper to be measured on the measuring device;

[0014] Step 2: After the buffer damper is installed in place, start the power supply to put the electric stretcher in the extended state, push the core shaft of the moving cylinder assembly to the left, compress the compression spring, and the compression spring force pushes the cylinder body to slide to the left along the horizontal guide hole of the guide support, pushes the adapter to move to the left, drives the position sensor to move to the left, and the position sensor display returns to zero;

[0015] Step 3. Adjust the function of the electric stretcher so that it is in a tensioned state, pull the core shaft to the right, pull the compression spring to the right, the spring force pushes the cylinder to slide to the right along the horizontal guide hole of the guide support, pull the adapter to the right, drive the position sensor to move to the right, and the position sensor displays the value of the axial error clearance of the buffer damper.

[0016] The advantages and positive effects of the present invention are:

[0017] The present invention realizes horizontal support of the entire buffer damper to be tested and clamping and fixing of the two ends of the outer cylinder assembly through a positioning support clamping mechanism; through a power mechanism connected to the buffer preload core assembly of the buffer damper, the buffer preload core assembly can be driven to move slightly in the left and right directions, and the slight movement is obtained through a displacement sensor, thereby realizing accurate quantitative detection of the axial clearance error of the buffer damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of a buffer damper according to the present invention;

[0019] Figure 2 yes Figure 1 Structural diagram of the middle buffer preload core component;

[0020] Figure 3 yes Figure 1 Structural schematic diagram of the middle and outer cylinder components;

[0021] Figure 4 It is an overall structural diagram of the axial clearance error measuring device for a buffer damper of the present invention;

[0022] Figure 5 It is a structural diagram of the positioning, supporting and pressing mechanism of the present invention;

[0023] Figure 6 It is a structural schematic diagram of a moving cylinder assembly in the power mechanism of the present invention. DETAILED DESCRIPTION

[0024] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0025] A device for measuring the axial clearance error of a buffer damper, see Figure 4-Figure 6 The invention point is: it mainly includes a positioning support clamping mechanism, a power mechanism and a displacement measurement part.

[0026] Positioning support clamping mechanism:

[0027] It is used to horizontally support the buffer damper measuring piece 3, the power mechanism and the displacement measuring part, and to clamp and fix the measuring piece at both ends, including a supporting part 1 and an end positioning and clamping part 2. The supporting part includes a base 1-1, a tail seat 1-2, a support seat 1-3, a support seat 2 1-4, a guide support 1-5, and a head seat 1-6. The base is arranged at the lowest position, and a horizontal support platform is formed at the upper end of the base. The head seat, the guide support seat, the support seat 2, the support seat 1 and the tail seat are all vertical seats, and are fixedly installed on the upper end of the base in sequence from right to left at a set interval. The left side of the head seat is an installation plane, which is used to realize the fixed installation of the power source part of the power mechanism. The upper end of the guide support is provided with a horizontal guide circular hole along the left and right directions, which is used to realize the installation of the moving cylinder assembly of the power mechanism. The upper ends of the support seat 2 and the support seat 1 are both semicircular arc structures, and the diameter is consistent with the outer diameter of the outer cylinder assembly of the buffer damper. The support seat 1 plays a supporting role and is a supporting point of the buffer damper; the support seat 2 plays a supporting role and is another supporting point of the buffer damper. The horizontal support of the buffer damper is achieved through two supporting points. The upper end of the tailstock is provided with a threaded hole for connecting the end positioning and clamping part.

[0028] The end positioning and clamping part 2 includes a head end positioning baffle 2-6 and a tail end positioning and clamping mechanism. The head end positioning baffle 2-6 is fixed to the right side of the support seat 2, and realizes the positioning stop of the right end face of the outer cylinder assembly of the buffer damper by contacting the front end face of the first section end cover of the outer cylinder assembly. A positioning groove is provided in the middle of the upper end of the head end positioning baffle for the head end sleeve of the buffer preload core assembly to extend. The tail end positioning and clamping mechanism includes an operating screw 2-1, a ball journal 2-2, a ball pressure cover 2-3, a ball seat 2-4, and a clamping plate 2-5. The operating screw is connected to the threaded hole on the tail seat, and the movement of the operating screw is realized by spiral transmission; the function of the operating screw is to realize the left and right movement of the operating screw by turning the left handle. The right end of the operating screw is connected to the ball journal to realize the left and right movement of the ball journal. A ball head is provided at the right end of the ball journal. The ball head, ball pressure cover and ball seat of the ball journal are connected to form a ball hinge. The ball journal is connected and positioned with the operating screw. The ball pressure cover and the ball seat can realize a certain range of rotation. The right end of the ball seat is connected with the clamping plate, and the left end face of the outer cylinder assembly of the buffer damper is fitted and clamped through the clamping plate.

[0029] Power mechanism:

[0030] It is mainly composed of an adapter 5, a movable cylinder assembly 6 and an electric stretcher 7. The movable cylinder assembly is composed of a cylinder body 6-1, two guide sleeves 6-2 and 6-4, a compression spring 6-3, a core shaft 6-7, an end cover 6-5, and a clamping nut 6-6. The cylinder body is a columnar cylinder body with a limited position surface inside the left end and an internal thread on the right end. The core shaft is an axial structure with a large diameter end at the left end, a small diameter external thread at the right end, and an optical axis in the middle body. The guide sleeve is a column sleeve with a center hole and an annular cavity on the periphery. The end cover is a disc-shaped cover with a center hole inside and an external thread on the outer ring.

[0031] The core shaft is inserted into the inner hole of the cylinder body in a manner that the right end extends out, and the two guide sleeves are sleeved on the core shaft at positions close to the two ends in a manner that the openings face each other. The compression spring is sleeved on the core shaft, and the two ends of the compression spring are respectively embedded in the annular cavities on the two guide sleeves. The end cover is connected to the internal thread at the right end of the cylinder body through an external thread, and the end cover is pressed and contacted with the right port of the guide sleeve at the right end, so that the guide sleeve at the left end is pressed and contacted with the limiting surface at the left end of the cylinder body. The clamping nut is threadedly connected to the external thread section at the right end of the core shaft, and is pressed and contacted with the right end face of the guide sleeve at the right end, so that the end of the core shaft is pressed and contacted with the left end face of the guide sleeve at the left end, forming a cylinder moving cylinder assembly, which plays a functional protection role during work, limits the pulling force value, and realizes the function of stretching within a limited range. The moving cylinder assembly is installed as a whole in a horizontal guide circular hole at the upper end of the guide support in a manner that it can move left and right.

[0032] The right end of the mandrel of the mobile cylinder assembly is connected to the working end of the electric stretcher, and the electric stretcher is fixedly mounted on the mounting plane of the head seat. The left end of the adapter is fixedly connected to the head end sleeve of the buffer preload core assembly, and the right end of the adapter is fixedly connected to the left end of the cylinder body of the mobile cylinder assembly.

[0033] Displacement measurement part:

[0034] A displacement sensor 4 is used, and the sensor is fixedly mounted on the upper end of the adapter.

[0035] The measurement method using the above-mentioned device for measuring the axial clearance error of the buffer damper is:

[0036] Step 1: First, install the buffer damper to be measured on the measuring device;

[0037] Step 2: After the buffer damper is installed in place, start the power supply to put the electric stretcher in the extended state, push the core shaft of the moving cylinder assembly to the left, compress the compression spring, and the compression spring force pushes the cylinder body to slide to the left along the horizontal guide hole of the guide support, pushes the adapter to move to the left, drives the position sensor to move to the left, and the position sensor display returns to zero;

[0038] Step 3. Adjust the function of the electric stretcher so that it is in a tensioned state, pull the core shaft to the right, pull the compression spring to the right, the spring force pushes the cylinder to slide to the right along the horizontal guide hole of the guide support, pull the adapter to the right, drive the position sensor to move to the right, and the position sensor displays the value of the axial error clearance of the buffer damper.

[0039] In step 2, the total displacement of the sensor to the left, △X1, can be obtained according to Hooke's law:

[0040] △X1=F1 / K

[0041] Where F1 is the thrust of the electric tensioner and K is the spring rate coefficient of 3-6.

[0042] In step 3, the total displacement of the sensor to the right, △X2, can be obtained according to Hooke's law:

[0043] △X2=F2 / K

[0044] Where F2 is the thrust of the electric tensioner and K is the spring rate coefficient of 3-6.

[0045] The total motion displacement △X of the position sensor obtained by superposition of the above two displacements is:

[0046] △X=△X1+△X2=(F1+F2) / k

[0047] Since the position sensor returns to zero at the far left end, the displacement and force in the above equations are scalars.

[0048] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A device for measuring axial clearance error of a buffer damper, characterized in that: It includes a positioning support clamping mechanism, a power mechanism and a displacement measuring part; the positioning support clamping mechanism includes a base, a tail seat, a support seat 1, a support seat 2, a guide support seat and a head seat; the base is arranged at the lowest position, and the head seat, the guide support seat, the support seat 2, the support seat 1 and the tail seat are all vertical seats, and are fixedly installed on the upper end of the base in sequence from right to left according to the set spacing; the upper ends of the support seat 2 and the support seat 1 are provided with semicircular support surfaces consistent with the outer surface shape of the outer cylinder assembly of the buffer damper, and the horizontal support of the buffer damper is realized through the two semicircular support surfaces; the upper end of the guide support is provided with a horizontal guide circular hole along the left and right directions; The end positioning and clamping part includes a head end positioning baffle and a tail end positioning and clamping mechanism; the head end positioning baffle is fixed to the right side of the second support seat, and is used to form a positioning match with the right end surface of the outer cylinder assembly of the buffer damper through contact, and allows the head end sleeve of the buffer preload core assembly to extend; the tail end positioning and clamping mechanism is threadedly connected to the upper part of the tail seat, and its right end is pressed and contacted with the left end surface of the outer cylinder assembly of the buffer damper to achieve axial limitation of the outer cylinder assembly of the buffer damper; The power mechanism includes an adapter, a movable cylinder assembly and an electric stretcher; the movable cylinder assembly is installed in a horizontal guide circular hole on the guide support in a manner that it can be moved in the left and right directions, the movable cylinder assembly is connected between the right end of the adapter and the working end of the electric stretcher, the left end of the adapter is fixedly connected to the head end sleeve of the buffer preload core assembly, and the electric stretcher is fixedly installed on the left side of the head seat.

2. The device for measuring axial clearance error of a buffer damper according to claim 1, characterized in that: The tail end positioning and clamping mechanism includes an operating screw, a ball journal, a ball pressure cover, a ball seat and a clamping plate; the operating screw is connected to the threaded hole on the tail seat, the right end of the operating screw is fixedly connected to the left end of the ball journal, and the right end of the ball journal is provided with a ball head; the ball head is rotatably embedded in a ball socket formed by the connection of the ball pressure cover and the ball seat, the right end of the ball seat is connected to the clamping plate, and the left end surface of the outer cylinder assembly of the buffer damper is pressed and fitted through the clamping plate.

3. The device for measuring axial clearance error of a buffer damper according to claim 2, characterized in that: The movable cylinder assembly is composed of a cylinder body, two guide sleeves, a compression spring, a core shaft, an end cover, and a compression nut; the cylinder body is a columnar cylinder body with a limited position surface arranged inside the left end and an internal thread arranged at the right end; the core shaft is an axial structure with a large-diameter end at the left end, a small-diameter external thread arranged at the right end, and a central main body part being an optical axis; the guide sleeve is a column sleeve with a center hole and an annular cavity arranged on the periphery; the end cover is a disc-shaped cover with a center hole arranged inside and an external thread arranged on the outer ring; The core shaft is installed in the inner hole of the cylinder body in a way that the right end extends out, and the two guide sleeves are sleeved on the core shaft at positions close to the two ends with their openings facing each other. The compression spring is sleeved on the core shaft, and the two ends of the compression spring are respectively embedded in the annular cavities on the two guide sleeves; the end cover is connected to the internal thread at the right end of the cylinder body through an external thread, and the end cover is pressed and contacted with the right port of the guide sleeve at the right end, so that the guide sleeve at the left end is pressed and contacted with the limiting surface at the left end of the cylinder body; the clamping nut is threadedly connected to the external thread section at the right end of the core shaft, and is pressed and contacted with the right end face of the guide sleeve at the right end, so that the end head of the core shaft is pressed and contacted with the left end face of the guide sleeve at the left end.

4. A measurement method using the device for measuring the axial clearance error of a buffer damper according to claim 3, characterized in that: The steps include: Step 1: First, install the buffer damper to be measured on the measuring device; Step 2: After the buffer damper is installed in place, start the power supply to put the electric stretcher in the extended state, push the core shaft of the moving cylinder assembly to the left, compress the compression spring, and the compression spring force pushes the cylinder body to slide to the left along the horizontal guide hole of the guide support, pushes the adapter to move to the left, drives the position sensor to move to the left, and the position sensor display returns to zero; Step 3. Adjust the function of the electric stretcher so that it is in a tensioned state, pull the core shaft to the right, pull the compression spring to the right, the spring force pushes the cylinder to slide to the right along the horizontal guide hole of the guide support, pull the adapter to the right, drive the position sensor to move to the right, and the position sensor displays the value of the axial error clearance of the buffer damper.

Images