CN107504931B - Measuring device - Google Patents
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- CN107504931B CN107504931B CN201710897574.7A CN201710897574A CN107504931B CN 107504931 B CN107504931 B CN 107504931B CN 201710897574 A CN201710897574 A CN 201710897574A CN 107504931 B CN107504931 B CN 107504931B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The present application provides a measuring device including: -a clamping mechanism (200) for releasably clamping at least one base member to which a parameter to be detected relates in a measuring position; -a measuring mechanism (300) independent of the clamping mechanism for measuring the parameter to be detected for the base member at the measuring position. In the technical scheme of the application, the clamping mechanism and the measuring mechanism are mutually independent, so that the measuring mechanism is not influenced by unnecessary bearing load when measuring, and higher accuracy is obtained.
Description
Technical Field
The application relates to the field of mechanical measurement, in particular to a measuring device for measuring geometric parameters of mechanical parts.
Background
It is well known that for high precision electromechanical products, it is necessary to detect not only the dimensional accuracy of the part after machining, but also the dimensional accuracy after assembly to ensure that the converted products have the desired mating relationship.
For example, as shown in fig. 1, in the assembly process of the engine, after the assembly shaft 10 is assembled into the housing 11, the assembly shaft 10 is displaced in the axial direction. When detecting the distance L between the circumferential groove on the test assembly shaft 10 and the housing end face, it is necessary to simulate the test assembly shaft 10 in a state of being subjected to a load, that is, it is necessary to complete lifting of the test assembly shaft 10 and then to perform the test.
Conventionally, when such conditions are encountered, the assembly shaft 10 is lifted into position, typically by the sensing means of the measuring device, and then the sensing means is used to make the sensing measurements. However, this measurement method has a disadvantage in that the accuracy of the measurement result is affected because the detection member carries the weight of the assembly shaft 10.
In view of this, it is desirable to provide a measuring device with higher accuracy.
Disclosure of Invention
In view of the above, the present application aims to provide a measuring device with higher accuracy.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
the application proposes a measuring device comprising: a clamping mechanism for releasably clamping at least one base member to which the parameter to be detected relates in a measuring position; and a measuring mechanism independent of the clamping mechanism for measuring the parameter to be detected for the base member located at the measuring position.
Preferably, the gripping mechanism is a lifting mechanism including a plurality of jaws having a degree of freedom in a vertical direction, the lifting mechanism having a release position at a lower position in which the plurality of jaws release the base member and a gripping position at a highest position in which the plurality of jaws hold the base member in the measurement position and being reciprocally movable between the release position and the gripping position.
Preferably, the measuring device includes a central shaft having one end for coaxially abutting against an assembly shaft as the base member; the lifting mechanism comprises: a connecting portion vertically slidably connected to the central shaft; and a horizontal portion extending radially outward and horizontally slidably coupled with the plurality of claws.
Preferably, a biasing member is provided between the horizontal portion and each of the claws, each biasing member applying a radially inward biasing force to the corresponding claw so that each claw is held in contact with the outer peripheral surface of the center shaft while moving in the axial direction of the center shaft.
Preferably, a groove is provided on the outer peripheral surface of the central shaft, the groove including a tapered section with a gradually decreasing radial dimension and a cylindrical section connected to the tapered section at the lower side; each of the claws is provided with a projection projecting toward the center shaft, which is always kept in contact with the outer peripheral surface of the center shaft by the biasing member, and the claws are tightened when the projection falls into the recess; the distal end of each of the claws is provided with a claw portion protruding toward the center shaft, the claw portion operating in synchronization with the protruding portion.
Preferably, an axial limiting mechanism is arranged on the central shaft and used for limiting the axial movement of the connecting part relative to the central shaft.
Preferably, the plurality of claws are uniformly arranged around the circumference and have a degree of freedom in the horizontal direction, the number of the claws being 3 to 6.
Preferably, the measuring mechanism comprises: a frame fixedly mounted to the central shaft; a sensing device mounted to the housing and comprising: a positioning claw to which an elastically deforming member is connected, the positioning claw having an initial position and a detection position for measuring the base member at the measurement position; a link mechanism that is linked with the positioning pawl; and a sensor for detecting the motion and/or displacement of the linkage.
Preferably, the linkage mechanism includes: a fixing bracket extending downward from the frame; the vertical blocks are arranged adjacent to the fixed support at intervals and are mutually elastically connected; an upper slider fixedly connected to the fixed bracket horizontally and slidably connected to the vertical block; and the lower floating block is horizontally and fixedly connected with the vertical block and can be slidably connected with the fixed bracket, the upper floating block and the lower floating block are elastically connected, the positioning claw and the lower floating block are arranged in a linkage manner, and the sensor is arranged on the fixed bracket and is used for detecting the action and/or displacement of the vertical block.
Preferably, the positioning claw is mounted on the vertical block and extends downwards, the upper floating block is hinged with a connecting rod, the connecting rod extends into a hook part extending from the positioning claw and is connected to the fixed support through a tension spring so as to apply a radially outward biasing force to the positioning claw through the hook part, a compression spring is arranged between the positioning claw and the vertical block so as to apply a radially inward biasing force to the positioning claw, the tail end of the connecting rod is abutted against the upper surface of the lower floating block through a roller, and the upper surface of the floating block is provided with a slope matched with the roller.
Preferably, the ramp descends progressively in a radially inward direction.
Preferably, the linkage mechanism further comprises a driver mounted to the fixed bracket for releasably applying a radially inward driving force to the link.
Preferably, the sensing device has a plurality of positioning claws which are uniformly arranged around the central shaft and are staggered with the plurality of claws, and the positioning claws can collide with the central shaft in a state where the plurality of claws hold the fitting shaft in the measurement position.
Preferably, the assembly shaft is provided with a circumferential groove, and in the measurement position, an upper end surface of the circumferential groove of the assembly shaft is supported by the plurality of claws, and the plurality of positioning claws can contact with the upper end surface of the circumferential groove.
Unlike conventional solutions, in the solution of the present application, the clamping mechanism and the measuring mechanism are independent from each other, so that the measuring mechanism is not affected by unnecessary load-bearing when measuring, thereby obtaining higher accuracy.
Additional features and advantages of the application will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a schematic diagram of a measurement condition according to an embodiment of the present application;
FIG. 2 is a schematic view of a measuring device according to an embodiment of the present application;
fig. 3 and 4 are partial enlarged views of the measuring device shown in fig. 2, respectively.
Detailed Description
The following describes specific embodiments of the present application in detail with reference to the drawings.
According to the present application, there is provided a measuring device comprising: a clamping mechanism for releasably clamping at least one base member to which the parameter to be detected relates in a measuring position; and a measuring mechanism independent of the clamping mechanism for measuring the parameter to be detected for the base member located at the measuring position.
The clamping mechanism is used for keeping the base piece at the measuring position so as to measure the parameter to be detected through the base piece. When the measurement is completed, the clamping mechanism releases the base member to return it to the original position. The parameters to be detected may be distance, displacement, length, etc., and thus the base member typically needs to be in relative relation to other elements or components to determine the parameters to be detected. The clamping mechanism may take a variety of forms, such as a clamp with a degree of freedom, etc.
Unlike conventional measuring devices, in the solution according to the application the measuring means and the holding means are independent of each other. In other words, the clamping structure is used for keeping the base member at the measuring position and then detecting by the measuring mechanism without applying a large force to the base member by the measuring mechanism. According to the technical scheme of the application, the measuring mechanism is focused on measurement without bearing larger load, so that the measuring mechanism has higher measuring accuracy compared with the traditional technical scheme.
The measuring mechanism can be various mechanisms which can be used for detecting the parameters to be detected, for example, according to different working condition occasions, the measuring mechanism can be a handheld measuring mechanism or an automatic or semi-automatic measuring mechanism by utilizing a sensor.
For the working condition shown in fig. 1, it is necessary to detect the distance between the circumferential groove on the fitting shaft 10 and the end face of the housing 20 in the fully lifted state as described above, specifically, for example, the distance between the upper surface of the circumferential groove and the end face of the housing 20.
Preferably, as shown in fig. 2, the clamping mechanism 200 is a lifting mechanism comprising a plurality of jaws 201, which has a degree of freedom in the vertical direction, which has a release position at a low level, in which the plurality of jaws release the base member, and a clamping position at a highest level, in which the plurality of jaws hold the base member in the measuring position, and is reciprocally movable between the release position and the clamping position.
The lifting mechanism has a degree of freedom in the vertical direction, which is set up to simulate the actual setting orientation of the assembly shaft 10 in the final product. The lifting mechanism has a degree of freedom in the vertical direction, and therefore holds the fitting shaft 10 at a lower release position, specifically, the holding position (the highest position means the highest position of the lifting mechanism in the vertical direction travel) where the fitting shaft 10 is held by the plurality of claws 201 and then lifted to the highest position, so that the fitting shaft as a base member is placed at a measurement position to be detected by intervention of the measurement mechanism. After the measuring mechanism finishes the measurement, the lifting mechanism clamps the fitting shaft 10 and moves down from the clamping position to the releasing position, thereby releasing the fitting shaft 10.
The lifting mechanism as the clamping mechanism is described above in connection with the working conditions shown in fig. 1, but the application is not limited thereto. The clamping mechanism may also have other degrees of freedom, such as degrees of freedom in the horizontal direction, or degrees of freedom in the rotational direction. In addition to the mounting shaft 10, the base part can also be another type of component, such as an end face of a housing or the like.
A specific embodiment of the present application is described in detail below with reference to fig. 2.
As shown in fig. 2, the measuring device according to the preferred embodiment of the present application includes a central shaft 100, one end of which central shaft 100 is for coaxially abutting against an assembly shaft 10 as the base member. The central shaft 100 serves as a mounting base for the lifting mechanism and the measuring mechanism. When the lifting mechanism lifts the assembly shaft 10 into position, the central shaft 100 abuts coaxially with the assembly shaft 10, achieving reliable positioning.
Lifting mechanism
As shown in fig. 2, the lifting mechanism includes: a connecting portion 202 and a horizontal portion 203, the connecting portion 202 being vertically slidably connected to the central shaft 100, the horizontal portion 203 extending radially outward and being horizontally slidably connected to the plurality of claws 201.
The connecting portion 202 may be slidably disposed on the central shaft 100 through a sliding rail structure. The sliding of the connection 202 may be achieved hydraulically, pneumatically, etc. In order to limit the sliding travel of the connection portion 202, a limiting structure may be provided, as shown in fig. 2. The structure of the connection portion is not particularly required, but needs to satisfy the requirement of the sliding arrangement. Preferably, the connection portion 202 is formed in a sleeve shape surrounding the central shaft 100.
The connecting portion 202 extends downward in the axial direction of the center shaft 100, and a horizontal portion 203 is connected to the bottom end. The horizontal portion 203 extends horizontally as a whole, but may include a structure having a longitudinal extension in part. The horizontal portion 203 is connected with a plurality of claws 201, and the plurality of claws 201 are horizontally slidably provided on the horizontal portion 203 so as to be able to approach or separate from the center shaft 100. The clamping operation of the fitting shaft 10 can be performed by the jaws when the plurality of jaws are all close to the central shaft 100, and the fitting shaft can be released when the plurality of jaws are all far away from the fitting shaft 10.
The sliding movement of the jaws 201 on the horizontal portion 203 can be achieved in a number of ways. For example, hydraulic drive, pneumatic drive, motor drive, etc. may be utilized.
Preferably, as shown in fig. 2, a biasing member 204 is provided between the horizontal portion 203 and each of the claws 201, and each biasing member 204 applies a radially inward biasing force to the corresponding claw 201 so that each claw 201 maintains contact with the outer peripheral surface of the center shaft 100 when moving in the axial direction of the center shaft 100. The biasing member 204 may be a spring that is compressed between the horizontal portion 203 and the pawl 201. The biasing member 204 may be other elastic members such as rubber members.
Due to the biasing force of the biasing member 204, each of the claws 201 is always in contact with the outer peripheral surface of the center shaft 100 when moving in the axial direction on the center shaft 100. In this case, the movement of the pawl 201 in the radial direction can be controlled by an external force against the biasing force.
The radial movement of the jaws 201 can be preferably achieved with the outer contour of the central shaft 100. As shown in fig. 2, a circumferential groove 101 is provided on the outer circumferential surface of the central shaft 100, and the groove 101 includes a tapered section with a gradually decreasing radial dimension and a cylindrical section connected to the tapered section at the lower side; each of the claws 201 is provided with a projection 205 projecting toward the center shaft 100, the projection 205 being always kept in contact with the outer peripheral surface of the center shaft 100 by the biasing member 204, and the claws 201 being tightened when the projection 205 falls into the groove 101; the distal end of each of the claws 201 is provided with a claw portion 206 protruding toward the center shaft 100, and the claw portion 206 operates in synchronization with the protruding portion 205.
With this structure, since the claw portion 206 operates in synchronization with the protrusion 205, when the protrusion 205 has not fallen into the groove 101, the claw portion 206 is relatively far from the central axis of the center shaft 100. As the protrusion 205 gradually falls into the recess 101, the claw 206 is relatively nearer to the center axis of the center shaft 100. Specifically, when the protrusion 205 is located above the groove 101, the pawl 201 is not tightened; as the protrusion 205 falls into the tapered section of the groove 101, the pawl 201 gradually tightens; when the protrusion 205 reaches the cylindrical end of the recess 101, the pawl 201 is fully tightened. Briefly, the tightening and release of the jaw portion 206 of the jaw 201 is controlled by the biaser 204 using the groove 101 as a walking mechanism.
The profile of the groove 101 may not be limited to the above-described combination of the tapered section and the cylindrical section, but may be only the tapered section or the cylindrical section.
As described above, the central shaft 100 is provided with an axial limiting mechanism for limiting the axial movement of the connecting portion 202 with respect to the central shaft 100. As shown in fig. 2, the axial stopper mechanism is a member protruding toward the horizontal portion 203, but the present application is not limited thereto, and may be configured to be able to perform stopper by other snaps, grooves, or the like.
Preferably, the plurality of jaws 201 are uniformly arranged around the circumference and have a degree of freedom in the horizontal direction (as described above), the number of the jaws being 3-6.
Measuring mechanism
After the fitting shaft 10 is lifted to the measurement position by the lifting mechanism, the measuring mechanism independent of the lifting mechanism extracts and detects the characteristics of the fitting shaft 10 as a base member. Since the measuring mechanism is not substantially subjected to the gravitational load of the fitting shaft 10, it is not adversely affected by the gravitational load, so that a measurement result of higher accuracy is obtained.
As shown in fig. 2, the measurement mechanism 300 includes:
a frame 301, wherein the frame 301 is fixedly mounted on the central shaft 100;
a sensing device mounted to the housing and comprising:
a positioning claw 302, the positioning claw 302 having an elastic deformation member attached thereto, the positioning claw 302 having an initial position and a detection position for measuring the base member at the measurement position;
a link mechanism that is linked to the positioning pawl 302; and
a sensor 303 for detecting the motion and/or displacement of the linkage.
The housing 301 is fixed to the central shaft 100 and provides a mounting base for the sensing device of the measuring mechanism. The sensing device serves as a core device of the measuring mechanism 300 for realizing the measuring function.
The positioning claw 302 of the sensing device is connected with an elastic deformation member (a notch is shown in the figure), and when the positioning claw 302 detects and measures the base member at the measuring position from the initial position, the positioning claw generates corresponding elastic deformation or small displacement (usually swing) through the elastic deformation member. Subsequently, the linkage mechanism in linkage connection with the positioning pawl 302 can reflect or embody the change of the positioning pawl, thereby detecting the motion and/or displacement of the linkage mechanism with the sensor 303, and further obtaining the measurement data.
In general, the linkage mechanism has an amplifying function, and amplifies information such as sensing or displacement change of the positioning claw 302, so as to facilitate detection of the sensor 303 and improve detection accuracy.
The linkage mechanism can have various structural forms, for example, can be a wedge mechanism or a link mechanism. Preferably, as shown in fig. 2, the linkage mechanism includes:
a fixing bracket 304, the fixing bracket 304 extends downward from the frame 301 (may be formed as a whole);
a vertical block 305, wherein the vertical block 305 is arranged adjacent to the fixed bracket 304 at intervals and is mutually elastically connected;
an upper slider 306, the upper slider 306 being fixedly connected to the fixed bracket 304 horizontally and slidably connected to the vertical block 305; and
a lower slider 307, the lower slider 307 being fixedly connected to the vertical slider 305 horizontally and slidably connected to the fixed bracket 304, the upper slider 306 and the lower slider 307 being elastically connected,
the positioning pawl is disposed in conjunction with the lower slider 307, and the sensor is mounted to the fixed bracket and is configured to detect movement and/or displacement of the vertical block 305.
The positioning pawl 302 is provided in conjunction with the lower slider 307, and when the positioning pawl 302 is actuated or displaced, the lower slider 307 is correspondingly actuated or displaced. Whereas, for the lower slider 307, the upper slider 306, the fixed bracket 304, and the vertical slider 305, since the members opposing each other are elastically connected, and the upper slider and the lower slider remain parallel to each other, a parallelogram mechanism is constituted. The action of the positioning pawl 302 causes the action of the lower slider 307, which in turn causes the action of the vertical block 305. Thus, the displacement information of the positioning pawl 302 can be indirectly obtained by detecting the movement and/or displacement of the vertical block 305 with the sensor.
The interlocking arrangement of the detents with the lower slider 307 can be achieved in a variety of ways. For example by a link connection or the like. Preferably, as shown in fig. 2, the positioning claw 302 is mounted on the vertical block 305 and extends downward, the upper slider 306 is hinged with a connecting rod 308, the connecting rod 308 extends into a hook 309 extending from the positioning claw 302 and is connected to the fixed bracket 304 through a tension spring 310 so as to apply a radially outward biasing force to the positioning claw 302 through the hook 309, a compression spring 311 is provided between the positioning claw 302 and the vertical block 305 so as to apply a radially inward biasing force to the positioning claw 302, the end of the connecting rod 308 abuts against the upper surface of the lower slider 306 through a roller 312, and the upper surface of the slider 306 is designed with a slope cooperating with the roller 312.
The positioning pawl 302 is mounted to the vertical block 305 to be closer to the center shaft 100. The positioning pawl 302 may also be mounted to the frame 301.
The upper slider 306 is hinged with a link 308, the link 308 extending downwardly through a hook 309 in communication with the positioning pawl 302, and a tension spring 310 exerting a radially outward biasing force on the positioning pawl 302 through the link 308 and the hook 309. The positioning pawl 302 can be placed in an open initial position by the tension of the tension spring 310. The compression spring 311 mainly plays a role of buffering vibration, and simultaneously, the link 308 is always kept in contact with the hook 309 due to the biasing force of the compression spring 311.
At the end of the link 308 is a roller 312, the roller 312 abuts against the upper surface of the lower slider 306, and the upper surface of the slider 306 is designed with a slope that mates with the roller 312. Thus, when the roller 312 of the link 308 rolls on the upper surface of the slider 306, the upper and lower sliders are displaced or moved in a vertical direction, thereby causing a corresponding movement or displacement of the vertical slider 305, since both the upper and lower sliders remain in a horizontal orientation.
As shown in fig. 2, the linkage mechanism further includes a driver 313 mounted to the fixed bracket 304 for releasably applying a radially inward driving force to the link 308. At the same time, the ramp gradually descends in a radially inward direction. The actuator 313 may be a hydraulic cylinder, an air cylinder, or the like. When the actuator 313 applies an inward driving force to the link 308, the roller moves leftward in the orientation shown in FIG. 2, thereby moving the lower slider through the ramp.
Preferably, in order to control the displacement amount of the elastic deformation member when the positioning pawl 302 performs measurement, the displacement amount of the positioning pawl 302 is prevented from exceeding the range that can be received by the elastic deformation member, and a stopper is provided on the positioning pawl 302 as shown in fig. 3.
Through the setting of this locating part, can be with the reasonable within range of displacement control of positioning pawl 302 to prevent the fatigue of elastic deformation spare, and then can make detection device be in good operating condition, keep having higher measurement accuracy.
As described above, the positioning pawl 302 has an initial position and a measurement position. The positioning pawl 302 can be in an initial position by the action of the resilient centering member and tension spring 310 and the compression spring 311.
As shown in fig. 3, the stop may preferably include a first stop 321 in order to limit the maximum displacement or limit position of the positioning pawl 302 radially outward. The first limiting member 321 is fixedly provided on the vertical block, but does not penetrate the positioning pawl 302, but is designed to protrude from the vertical block toward the positioning pawl. Thus, when the positioning pawl 302 moves radially outward, a radially outward limit position is reached when the end of the first stop 321 is contacted.
Preferably, the first limiting member 321 is connected to the vertical block by a screw. However, the present application is not limited thereto, and the first limiting member 321 may be fixedly connected or integrally formed with the vertical block.
Preferably, as shown in fig. 3, a second stop 322 is provided on the vertical block, said second stop 322 passing through said positioning pawl 302 and limiting the maximum displacement of the positioning pawl 302 radially inwards (left direction in fig. 2 and 3).
The positioning pawl 302 is penetrated by a second stop 322 with a gap provided therebetween to permit displacement or movement of the positioning pawl 302. The second stop 322 provides the radially inward limit to the positioning pawl 302, in other words, when the positioning pawl 302 moves radially inward to a position of interference with the second stop 322, the positioning pawl 302 reaches a maximum radially inward displacement and limit and no further deformation or displacement is possible.
The second limiting member 322 may be provided on the vertical block in various manners, for example, may be fixedly connected or integrally formed. Preferably, however, the second stop 322 is threadably coupled to the vertical block so that the radially inward limit of the positioning pawl 302 can be controllably adjusted to accommodate different operating conditions. The restraining action of the second restraining member with the positioning pawl 302 may be achieved by a stepped structure or a pin structure within the through hole.
By using the limiting piece comprising the first limiting piece 321 and/or the second limiting piece 322, the positioning claw can be ensured to be in a reasonable deformation and displacement range.
Preferably, there are a plurality of positioning claws which are uniformly arranged around the central shaft 100 and are provided to be staggered with respect to the plurality of claws, and which can collide with the fitting shaft 10 in a state where the plurality of claws hold the fitting shaft 10 in the measurement position. That is, the positioning pawl can collide with a predetermined position of the fitting shaft 10 as the base member when the pawl holds the fitting shaft 10 in the measurement position. Specifically, the assembly shaft 10 is provided with a circumferential groove, and in the measurement position, an upper end surface of the circumferential groove of the assembly shaft 10 is supported by the plurality of claws, and the plurality of positioning claws can contact with the upper end surface of the circumferential groove.
As shown in fig. 4, a measurement reference block 331 is provided at the lower end of the fixed bracket 304. The function of the measurement reference block 331 is to determine the position of the reference zero position so that the measurement result is obtained by the relative positional relationship with the positioning pawl 302, and therefore the position of the measurement reference block 331 is very important. Further, measuring the position of the reference block 331 can determine the position of the positioning pawl 302.
When the measurement is performed, the end of the positioning pawl 302 preferably abuts against the upper end face of the circumferential groove, and the force or elastic deformation amount therebetween is not preferably too large or too small, but is within a suitable range, so that a high-precision measurement result can be obtained. Therefore, the mounting between the measurement reference block 331 and the fixed bracket 304 is preferably adaptive or adjustable. In other words, the measurement reference block 331 is adjustably mounted to the fixed bracket 304.
Preferably, the measurement reference block 331 and the fixed bracket 304 are elastically connected to each other, for example by an elastic piece 332. Due to the elastic connection, rigid contact of the measurement reference block 331 can be avoided, which is advantageous for maintaining data stability of the measurement result.
Further preferably, a plurality of mounting holes are provided in the elastic piece 332, so that the measurement reference block 331 can be mounted to the fixed bracket 304 through different mounting holes, and the position of the measurement reference block 331 with respect to the fixed bracket 304 can be further adjusted.
It is further preferred that the fixed bracket 304 is not a unitary structure, but is an assembly. In this case, an adjustment spacer 333 may be provided at the fixing bracket 304. Therefore, by adjusting the thickness of the adjustment pad, the position adjustment of the measurement reference block 331 and the measurement unit is achieved.
Measurement procedure
After the upper surface of the circumferential groove of the fitting shaft is engaged with the plurality of claws of the lifting mechanism, the fitting shaft 10 is lifted to the highest position (i.e., measurement position).
After the proposal action is completed, the process requirement of the workpiece for making up the assembly gap is met. And after the workpiece is stable, measuring by using a measuring mechanism.
Under the action of the tension spring, the positioning claw is in an open state at the initial position. The actuator 313 is then activated, for example such that the piston rod of the cylinder is extended, which will contact and push against the link 308. As the stroke of the cylinder increases, the connecting rod 308 drives the roller to move leftwards, and the positioning claw is always stressed leftwards under the action of the pressure spring 311. When the roller 312 moves left, the hook 309 moves left under the force of the compression spring, and the positioning pawl starts to swing clockwise at the elastomer gap by an angle, i.e., the positioning pawl is retracted and abuts against the upper end surface of the circumferential groove of the assembly shaft 10.
Meanwhile, the lower floating block and the upper floating block below the roller are always in a tension state, and a parallelogram mechanism is formed among the lower floating block, the upper floating block, the vertical block and the fixed bracket as described above. Therefore, when the roller moves leftward along the upper surface of the lower slider, the lower slider moves upward due to the inclined surface structure of the lower slider, and thus, the tension spring between the upper slider and the lower slider. Meanwhile, since the lower slider is fixedly connected with the vertical block, the vertical block is caused to correspondingly move or displace upward, and the movement or displacement generated by the vertical block can be detected and obtained by the above-mounted sensor 303, and a corresponding value can be obtained, and the value can be calculated to obtain a required measured value.
In addition, in combination with detection of the end face of the housing by the measurement reference block 331, the distance between the upper end face of the circumferential groove of the fitting shaft and the end face of the housing can be obtained.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather, any modification, combination, equivalent replacement, improvement or the like which comes within the spirit and principles of the present application are included in the scope of the present application.
Claims (11)
1. Measuring device, characterized in that it comprises:
-a clamping mechanism (200) for releasably clamping at least one base member to which a parameter to be detected relates in a measuring position;
a measuring means (300) which is independent of the clamping means and which is used to measure the parameter to be detected on the base piece in the measuring position, which measuring means are not subjected to unnecessary load-bearing,
the clamping mechanism (200) is a lifting mechanism comprising a plurality of jaws (201) having a degree of freedom in a vertical direction, the lifting mechanism having a release position at a lower level and a clamping position at a highest level and being reciprocally movable between the release position, in which the plurality of jaws release the base member, and a clamping position, in which the plurality of jaws hold the base member in the measurement position;
the measuring device comprises a central shaft (100), one end of the central shaft (100) is used for coaxially propping up an assembly shaft (10) serving as the base piece;
the lifting mechanism comprises: a connecting portion (202), the connecting portion (202) being vertically slidably connected to the central shaft (100); and a horizontal portion (203) extending radially outward and horizontally slidably connected with the plurality of claws (201);
the measuring mechanism (300) includes: a frame (301), wherein the frame (301) is fixedly mounted on the central shaft (100); the sensing device is arranged on the rack and comprises a positioning claw (302), a linkage mechanism and a sensor (303), wherein the positioning claw (302) is connected with an elastic deformation piece, the positioning claw (302) is provided with an initial position and a detection position for measuring a basic piece at the measurement position, the linkage mechanism is connected with the positioning claw (302) in a linkage way, and the sensor is used for detecting the action and/or displacement of the linkage mechanism.
2. A measuring device according to claim 1, characterized in that a biasing member (204) is provided between the horizontal portion (203) and each jaw (201), each biasing member (204) exerting a radially inward biasing force on the corresponding jaw (201) to keep each jaw (201) in contact with the outer circumferential surface of the central shaft (100) when moving in the axial direction of the central shaft (100).
3. A measuring device according to claim 2, characterized in that a groove (101) is provided on the outer circumferential surface of the central shaft (100), which groove (101) comprises a conical section of decreasing radial dimension and a cylindrical section connected to the conical section at the lower side;
each of the claws (201) is provided with a protrusion (205) protruding toward the center shaft (100), the protrusion (205) is always kept in contact with the outer peripheral surface of the center shaft (100) by the biasing member (204), and the claws (201) are tightened when the protrusion (205) falls into the groove (101);
the distal end of each claw (201) is provided with a claw portion (206) protruding toward the center shaft (100), and the claw portion (206) operates in synchronization with the protruding portion (205).
4. The measurement device according to claim 1, wherein an axial limiting mechanism is provided on the central shaft (100) for limiting the axial movement of the connection part (202) relative to the central shaft (100).
5. The measuring device according to claim 1, characterized in that the plurality of jaws (201) are arranged evenly around the circumference and have a degree of freedom in the horizontal direction, the number of jaws being 3-6.
6. The measurement device of claim 1, wherein the linkage comprises:
-a fixed support (304), the fixed support (304) extending downwards from the frame (301);
a vertical block (305), wherein the vertical block (305) is arranged adjacent to the fixed bracket (304) at intervals and is mutually elastically connected;
an upper slider (306), the upper slider (306) being fixedly connected to the fixed bracket (304) horizontally and slidably connected to the vertical slider (305); and
a lower slider (307), the lower slider (307) being fixedly connected to the vertical block (305) horizontally and slidably connected to the fixed bracket (304), the upper slider (306) and the lower slider (307) being elastically connected,
the positioning claw is arranged in linkage with the lower floating block (307), and the sensor is mounted on the fixed bracket and used for detecting the action and/or displacement of the vertical block (305).
7. The measuring apparatus according to claim 6, wherein,
the positioning claw (302) is arranged on the vertical block (305) and extends downwards, the upper floating block (306) is hinged with a connecting rod (308), the connecting rod (308) extends into a hook part (309) extending from the positioning claw (302) and is connected with the fixed bracket (304) through a tension spring (310) so as to apply a radially outward biasing force to the positioning claw (302) through the hook part (309), a compression spring (311) is arranged between the positioning claw (302) and the vertical block (305) so as to apply a radially inward biasing force to the positioning claw (302),
the tail end of the connecting rod (308) is abutted against the upper surface of the lower floating block (306) through a roller (312), and the upper surface of the floating block (306) is provided with a slope matched with the roller (312).
8. The measurement device of claim 7, wherein the ramp gradually descends in a radially inward direction.
9. The measurement device of claim 7, wherein the linkage further comprises a driver (313) mounted to the fixed bracket (304) for releasably applying a radially inward driving force to the link (308).
10. The measuring device according to claim 1, characterized in that the sensing device has a plurality of positioning claws which are arranged uniformly around the central shaft (100) and are arranged staggered with respect to the plurality of claws, which positioning claws can abut against the central shaft (100) in a state in which the plurality of claws hold the assembly shaft (10) in the measuring position.
11. The measuring device according to claim 10, characterized in that the assembly shaft (10) is provided with a circumferential groove, in which measuring position the upper end face of the circumferential groove of the assembly shaft (10) is supported by the plurality of jaws, which are contactable with the upper end face of the circumferential groove.
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| CN201710897574.7A CN107504931B (en) | 2017-09-28 | 2017-09-28 | Measuring device |
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| CN201710897574.7A CN107504931B (en) | 2017-09-28 | 2017-09-28 | Measuring device |
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| CN107504931B true CN107504931B (en) | 2023-09-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110044314A (en) * | 2019-03-27 | 2019-07-23 | 南京泰普森自动化设备有限公司 | Flexible floating straight pillar matching cylinder cap measuring device and cylinder cap automatic assembly line |
| CN110132336B (en) * | 2019-04-24 | 2024-07-12 | 南京泰普森自动化设备有限公司 | Measuring part mounting structure and measuring device |
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| CN107504931A (en) | 2017-12-22 |
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