Dimension measuring equipment for laboratory

Abstract

The invention discloses a size measuring device for a laboratory, and relates to the related technical field of measuring tools, the size measuring device comprises a measuring platform and a measuring machine arranged on the measuring platform, the measuring machine measures a workpiece in a three-dimensional space formed by an x axis, a y axis and a z axis, the size measuring device further comprises a passive supporting assembly, and the passive supporting assembly comprises a plurality of supporting rod bodies. Each supporting rod body is arranged on the measuring platform in the z-axis direction in a movable mode, and a locking mechanism is further arranged on the measuring platform; when a workpiece is placed on the measuring platform, the multiple supporting rod bodies move downwards by different distances on the measuring platform in the z-axis direction according to the appearance structure and the gravity effect of the workpiece, and when the measuring machine carries out measuring operation, the locking mechanism locks and limits the positions of the multiple supporting rod bodies.

Description

Technical Field

[0001] The present invention relates to the technical field related to measuring tools, in particular to a dimension measuring device for laboratory use. Background Art

[0002] As is known to all, in mechanical manufacturing, the size, shape and position accuracy of some parts need to be measured in the laboratory. Therefore, the measuring tools used also include various types: contact measuring devices: three-dimensional coordinate measuring machines, universal length measuring machines, gauge block measuring instruments, etc.; non-contact measuring devices: optical three-dimensional scanners, laser interferometers, laser trackers, etc.; special-purpose measuring devices: cross-sectional area measuring instruments, optical heterodyne micro-vibration displacement measuring instruments, large-scale measuring systems, etc.; according to different usage scenarios and measurement requirements, appropriate measuring tools can be selected.

[0003] Among them, the three-dimensional coordinate measuring machine works by moving the probe on three mutually perpendicular guide rails to measure the three-dimensional size of the object. The probe contacts the surface of the object to be measured, records the coordinate points, and determines the size and shape of the object by calculating the distance and angle relationship between these points.

[0004] For example, patent number CN219736294U, dated September 22, 2023, and entitled "A Portable Three-Dimensional Coordinate Measuring Machine Convenient for Fixing and Adjusting," discloses a portable three-dimensional coordinate measuring machine that is convenient for fixing and adjusting. A base plate is fixedly mounted on the bottom of the measuring machine body, and a slide groove is provided on the other side of the base plate along its length. Both ends of a driving rod are rotatably mounted in the slide groove through through holes. A slider is mounted on the driving rod, and an adjustment rod mechanism is provided on the slider. The right end of the driving rod extends out of the slide groove and is provided with a sliding adjustment device. A fork groove is provided on the bottom of the base plate along its length. The portable three-dimensional coordinate measuring machine has a simple design structure and is easy to operate. It facilitates simultaneous adjustment of two sets of sliders, ensuring uniformity in the movement positions of the two sets of sliders and improving the stability of the fixed adjustment of the measuring machine. The swivel and swivel base are detachable, effectively preventing accidental touch and misoperation. The two adjustment rods can be adjusted even without tools, increasing the torque. The adjustment rods can be used to adjust the levelness of the measuring machine at any time with less effort, improving work efficiency, and enhancing the functionality and practicality of the three-dimensional coordinate measuring machine.

[0005] In the prior art, the platform on which the workpiece to be measured is placed in a three-dimensional coordinate measuring machine is basically a planar structure. It can stably place workpieces with regular shapes, but it is difficult to achieve stable placement for workpieces with irregular shapes. Moreover, during the measurement process, the probe of the three-dimensional coordinate measuring machine needs to maintain a certain pressure contact with the surface of the workpiece to be measured. For workpieces that cannot be placed stably, this pressure contact can easily cause the workpiece to wobble, which obviously leads to inaccurate measurement results. Therefore, to solve this problem, plasticine or instrument wax is usually used to stabilize the workpiece. However, the plasticine or instrument wax needs to be cleaned after each measurement, making it unsuitable for continuous use. Vacuum chucks or magnetic clamps are also used for fixing, but their application range is limited and they are generally only suitable for workpieces with simple shapes such as planes and cylinders. Finally, mechanical clamps are used for fixing, but elastic materials such as rubber or cork are required between the clamp and the part to avoid deformation of the part surface. Therefore, it is necessary to provide a mechanism that can adapt to the shape of the workpiece and provide stable support for the workpiece. Summary of the Invention

[0006] The purpose of the present invention is to provide a laboratory dimensional measuring device to solve the technical problems in the related art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A laboratory dimensional measuring device includes a measuring platform and a measuring machine disposed on the measuring platform. The measuring machine measures a workpiece in a three-dimensional space formed by an x-axis, a y-axis, and a z-axis. The device also includes a passive support assembly comprising a plurality of support rods, each of which is movably arranged on the measuring platform along the z-axis. A locking mechanism is also provided on the measuring platform. When a workpiece is placed on the measuring platform, the plurality of support rods move downward on the measuring platform along the z-axis by different distances according to the workpiece's external structure and the action of gravity. When the measuring machine starts a measuring operation, the locking mechanism locks and restricts the positions of the plurality of support rods.

[0009] As mentioned above, the multiple support rods are divided into origin rods and non-origin rods, and a first ring body is provided at a position corresponding to each non-origin rod on the measuring platform. A first friction block is provided for sliding in a certain radial direction of the first ring body, and a first elastic member is provided between the first friction block and the first ring body in the sliding direction.

[0010] As mentioned above, the end of the origin rod body facing the probe is provided with a tray, and a protection hole is opened at the center of the tray. When the measuring machine is at the origin position, the tray abuts against the part connected to the probe, and the probe is inserted into the protection hole.

[0011] As mentioned above, the non-origin position rod body is divided into multiple rows in sequence along the y-axis direction; the locking mechanism includes a plurality of locking grooves opened along the z-axis direction on each non-origin position rod body, and locking rods are provided on both sides of each row of non-origin position rod bodies, and a second elastic member is provided between the two locking rods. Based on the elastic force of the second elastic member, the two locking rods tend to approach each other and be plugged into the corresponding locking grooves; a third elastic member is provided between the origin position rod body and the measuring platform, an extrusion member is installed on the origin position rod body, and a pressure member is provided on each locking rod; based on the extrusion effect of the measuring machine on the origin position rod body along the z-axis direction, during the stroke in which the extrusion member extrudes the pressure member, the locking rod and the corresponding locking groove move away from each other to release the lock of the non-origin position rod body.

[0012] As mentioned above, a rubber ball is provided at the end of the non-origin rod body that contacts the workpiece. During the measurement stroke of the measuring machine on the workpiece, the force exerted when the probe contacts the workpiece is not sufficient to squeeze the rubber ball through the workpiece to cause elastic deformation.

[0013] As mentioned above, the radial dimension of the rubber ball is larger than the radial dimension of the contact part between the non-origin rod and the measuring platform, and a reset plate is also provided on the measuring platform for sliding along the z-axis direction. The reset plate is in sliding contact with each support rod. After the workpiece is removed from the measuring platform, the reset plate is pulled along the z-axis to drive each non-origin rod back to its initial position.

[0014] As mentioned above, the portion of the non-origin rod body that contacts the measuring platform is provided with a second friction block that slides radially. Based on the dynamic action of the rubber ball, the second friction block tends to approach the first friction block.

[0015] As mentioned above, a screw is provided for rotating inside the non-origin rod body, a first extrusion block is screwed on the screw, a second extrusion block is provided on the screw for sliding along the axial direction, a fifth elastic member is provided between the first extrusion block and the second extrusion block, and the rubber ball is screwed to the end of the screw. During the rotation of the rubber ball, the extrusion block produces a radial extrusion effect on the second friction block.

[0016] As mentioned above, a fourth elastic member is provided between the first ring body and the measuring platform, and a plug-in mechanism is provided between the first ring body and the non-origin position rod body; when the gravity of the workpiece is not sufficient to overcome the elastic force of the fourth elastic member, the plug-in mechanism disconnects the connection between the first ring body and the non-origin position rod body, and the non-origin position rod body supports the workpiece by using the friction force between the first friction block and the second friction block; when the gravity of the workpiece is sufficient to overcome the elastic force of the fourth elastic member, the plug-in mechanism connects the first ring body and the non-origin position rod body, and the non-origin position rod body supports the workpiece by using the elastic force of the fourth elastic member.

[0017] As mentioned above, the plug-in mechanism includes a plug-in groove opened on the rod body at the non-origin position, a second ring body is axially slidably sleeved on the first ring body, and the second ring body is connected to the two locking plug rods at the corresponding positions by a transmission rod; the second ring body has on the first ring body: in the first position, when the gravity of the workpiece is not enough to overcome the elastic force of the fourth elastic member, the second ring body does not produce an extrusion effect on the first friction block; in the second position, when the gravity of the workpiece is enough to overcome the elastic force of the fourth elastic member, the second ring body squeezes the first friction block into the plug-in groove.

[0018] The beneficial effect of the present invention is that by arranging multiple support rods along the z-axis direction on the measuring platform, when the workpiece is placed on the measuring platform, since the side of the workpiece facing the measuring platform has different external structures, the degree of downward pressure of the support rod at each position is different, so the multiple support rods can passively adapt to the external structure of the workpiece, and then when the measuring machine is operating, the locking mechanism locks the position of each support rod, so that the purpose of adapting to the external shape of the workpiece and providing stable support for the workpiece can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of a laboratory dimension measuring device provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the bottom plan structure of a laboratory dimension measuring device provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal three-dimensional structure of a passive support assembly of a laboratory dimensional measuring device provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the exploded structure of a non-origin rod of a laboratory size measuring device provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic cross-sectional view of a locking mechanism of a laboratory dimension measuring device provided in an embodiment of the present invention when locking a rod at a non-origin position;

[0025] Figure 6 A schematic cross-sectional view of a laboratory dimension measuring device provided in an embodiment of the present invention, wherein the elastic force of a fourth elastic member is used to achieve adaptive support for a workpiece;

[0026] Figure 7 This is a schematic cross-sectional structure diagram of a laboratory dimension measuring device provided in an embodiment of the present invention, which utilizes the friction force between a first friction block and a second friction block to achieve adaptive support for a workpiece.

[0027] Description of reference numerals:

[0028] 1. Measuring platform; 10. Measuring machine; 2. Passive support assembly; 20. Origin position rod; 200. Tray; 201. Protective hole; 21. Non-origin position rod; 210. Insertion slot; 211. Second ring body; 212. Transmission rod; 22. First ring body; 23. First friction block; 24. Rubber ball; 25. Reset plate; 26. Second friction block; 27. Screw; 28. First extrusion block; 29. Second extrusion block; 3. Locking mechanism; 30. Locking slot; 31. Locking rod; 32. Extrusion piece; 33. Pressure piece; 34. Slide; 35. Slider. DETAILED DESCRIPTION

[0029] In order to make those skilled in the art better understand the technical solution of the present invention, Figure 1 To the attached Figure 7 The present invention is further described in detail.

[0030] One embodiment of the present invention provides a laboratory dimensional measuring device, including a measuring platform 1 and a measuring machine 10 disposed on the measuring platform 1, wherein the measuring machine 10 measures a workpiece in a three-dimensional space composed of an x-axis, a y-axis, and a z-axis, and further includes a passive support assembly 2, which includes a plurality of support rods, each of which is movably arranged along the z-axis on the measuring platform 1, and a locking mechanism 3 is also provided on the measuring platform 1; when the workpiece is placed on the measuring platform 1, the plurality of support rods move downward by different distances along the z-axis on the measuring platform 1 according to the external structure of the workpiece and the action of gravity, and when the measuring machine 10 starts a measurement operation, the locking mechanism 3 locks and restricts the positions of the plurality of support rods.

[0031] Specifically, the surface of the measuring platform 1 for placing the workpiece to be measured is parallel to the common plane where the x-axis and the y-axis are located. A first guide rail and a driving member for the measuring machine 10 to move along the x-axis are provided on both sides of the measuring platform 1 along the y-axis direction. A second guide rail and a driving member for the measuring machine 10 to move along the y-axis are provided on the first guide rail, and a driving member for the measuring machine 10 to move along the z-axis is provided on the second guide rail. In summary, the measuring machine 10 can move in the three-dimensional space composed of the x-axis, y-axis and z-axis. For the driving member that drives the measuring machine 10 to move, such as a screw transmission mechanism, a belt transmission mechanism, etc., can be used. This is the existing technology and can be optimized according to actual usage. The working principle of the measuring machine 10 is also the existing technology and will not be elaborated on here.

[0032] In the prior art, the measuring platform 1 is a planar structure, which can be placed stably for workpieces with regular shapes, but it is difficult to achieve stable placement for workpieces with special shapes. In addition, during the measurement of the workpiece, the probe of the three-dimensional coordinate measuring machine 10 needs to maintain a certain pressure contact with the surface to be measured of the workpiece. For workpieces that cannot be placed stably, the pressure contact is likely to cause the workpiece to shake, which will obviously lead to inaccurate measurement results. In order to solve this problem, plasticine or instrument wax is usually used to stabilize the workpiece, but after each measurement, the plasticine or instrument wax needs to be cleaned up, which is not suitable for continuous use. There are also vacuum chucks or magnetic clamps, but the scope of application is small, generally only for some simple-shaped workpieces such as planes and cylinders. In addition, mechanical clamps are used for fixation, but elastic materials such as rubber or cork need to be placed between the clamp and the part to avoid deformation of the part surface.

[0033] Therefore, based on some problems existing in the above-mentioned prior art, in this embodiment, a passive support component 2 is set on the measuring platform 1, that is, a plurality of support rods with cylindrical structures are arranged along the z-axis on the measuring platform 1, and each support rod can move when subjected to an external force on the measuring platform 1, that is, there can be friction between the support rod and the measuring platform 1, and when the external force applied to the support rod is greater than the friction force generated by the friction, the support rod can move on the measuring platform 1. In this way, when some special-shaped workpieces (the workpieces mentioned in the article are all special-shaped workpieces, that is, when the workpiece is directly placed on the measuring platform 1, the workpiece is difficult to remain stable, and the force when the probe of the measuring machine 10 contacts the surface of the workpiece is sufficient to cause When the workpiece is placed on the measuring platform 1 (the workpiece shakes), the surface shape structure of the workpiece facing the measuring platform 1 is different. For the support rod body at the corresponding position of each part, the distance that the support rod body is pressed down will also be different. Therefore, multiple support rod bodies can passively adapt to the shape structure of the workpiece. Later, when the measuring machine 10 starts to measure the workpiece, the locking mechanism 3 locks the positions of the multiple support rod bodies, so that the force generated by the probe contacting the surface of the workpiece will not cause the workpiece to shake. The locking mechanism 3 locks the position of the support rod body, such as providing a locking bolt on the part of the measuring platform 1 corresponding to each support rod body, and restricting the movement of the support rod body by tightening the bolt. This is the existing technology and will not be elaborated on.

[0034] The beneficial effect of this embodiment is that by arranging multiple support rods along the z-axis direction on the measuring platform 1, when the workpiece is placed on the measuring platform 1, since the side of the workpiece facing the measuring platform 1 has different external structures, the degree of downward pressure of the support rod at each position is different, so the multiple support rods can passively adapt to the external structure of the workpiece. Then, when the measuring machine 10 is operating, the locking mechanism 3 locks the position of each support rod, thereby achieving the purpose of adapting to the external shape of the workpiece and providing stable support for the workpiece.

[0035] Preferably, the multiple support rods are divided into origin rods 20 and non-origin rods 21, and a first ring body 22 is provided at a position corresponding to each non-origin rod 21 on the measuring platform 1. A first friction block 23 is provided for sliding in a certain radial direction of the first ring body 22. The first friction block 23 is in friction contact with the surface of the support rod, and in the sliding direction, a first elastic member is provided between the first friction block 23 and the first ring body 22.

[0036] Specifically, in the aforementioned embodiment, the friction force between the support rod and the measuring platform 1 is used to achieve adaptive support for the workpiece. However, due to the friction, a certain amount of wear will be caused to the measuring platform 1. When the measuring platform 1 is in operation, it needs to contact the surface of the workpiece, and the worn part will contact the surface of the workpiece, which may easily cause wear on the surface of the workpiece, resulting in inaccurate measurement results.

[0037] The origin position rod 20 is the corresponding supporting rod when the probe is at the origin position, and the remaining supporting rods are all non-origin position rods.

[0038] Therefore, in this embodiment, a space is opened at the bottom of the measuring platform 1 away from the workpiece. A part of the non-origin position rod body 21 is above the measuring platform 1, and the other part is in the space. In this way, a first ring body 22 is installed on the bottom of the measuring platform 1 in the space. Each non-origin position rod body 21 corresponds to a first ring body 22. The first ring body 22 is a split structure, divided into two parts in half, and the two parts are connected by bolts. A first friction block 23 is slidingly provided in a certain radial direction of the first ring body 22 to be in frictional contact with the surface of the non-origin position rod body 21. The position of the first friction block 23 is at the joint of the two parts of the first ring body 22, and a first elastic member is provided between it and the first ring body 22 in its sliding direction. That is, the elastic force of the first elastic member is utilized to ensure that the first friction block 23 always maintains frictional contact with the outer wall of the non-origin position rod body 21, thereby not causing wear on the measuring platform 1.

[0039] Preferably, a tray 200 is provided at the end of the origin rod 20 facing the probe, and a protective hole 201 is opened at the center of the tray 200. When the measuring machine 10 is at the origin position, the tray 200 abuts against the part connected to the probe, and the probe is inserted into the protective hole 201.

[0040] Specifically, the existing three-dimensional coordinate measuring machine 10 does not protect the probe part of the measuring machine 10 when placing the workpiece, so there is a situation where the probe is accidentally hit, resulting in damage to the probe and affecting the measurement operation. Therefore, in this embodiment, a tray 200 is set on the origin rod body 20, and the tray 200 is abutted against the probe connection part, and the probe is inserted into the protective hole 201 at the center position of the tray 200. In this way, when the workpiece is placed, the workpiece can be prevented from contacting the probe.

[0041] Preferably, the non-origin position rod body 21 is divided into multiple rows in sequence along the y-axis direction; the locking mechanism 3 includes a plurality of locking grooves 30 opened along the z-axis direction on each non-origin position rod body 21, and locking rods 31 are provided on both sides of each row of non-origin position rod bodies 21, and a second elastic member is provided between the two locking rods 31. Based on the elastic force of the second elastic member, the two locking rods 31 tend to approach each other and be plugged into the corresponding locking grooves 30; a third elastic member is provided between the origin position rod body 20 and the measuring platform 1, and an extrusion member 32 is installed on the origin position rod body 20, and a pressure member 33 is provided on each locking rod 31; based on the extrusion effect of the measuring machine 10 on the origin position rod body 20 along the z-axis direction, during the stroke in which the extrusion member 32 squeezes the pressure member 33, the locking rod 31 moves away from the corresponding locking groove 30 to release the lock on the non-origin position rod body 21.

[0042] Specifically, the non-origin position rod body 21 is composed of two parts that are split in half along the axial direction, and the two parts are fixedly connected by bolts. The locking groove 30 arranged thereon is a semicircular structure on each part of the non-origin position rod body 21. The locking rod 31 is plugged into or separated from the locking groove 30 along the radial direction. A slideway 34 is provided along the y-axis on the measuring platform 1, and a plurality of sliders 35 are slidingly arranged in the slideway 34. Each locking rod 31 is fixedly connected to a slider 35. The second elastic member connected between the two locking rods 31 corresponding to each row of the non-origin position rod body 21 is provided between the two sliders 35 corresponding to the two locking rods 31, and in the absence of other external forces The locking rod 31 is locked and locked in place due to the second spring force. The locking rod 31 is locked and locked in place due to the second spring force. The locking rod 31 is locked and locked in place due to the second spring force. The number of extrusion members 32 matches the number of pressure members 33, or each extrusion member 32 squeezes the two pressure members 33 corresponding to each row of non-origin rods 21. In the process of placing the workpiece on the measuring platform 1, before the workpiece is measured, each non-origin rod 21 can be moved on the measuring platform 1 by an external force, that is, at this time, the probe part of the measuring machine 10 will generate a downward pressure force along the z-axis direction on the pallet 200. This force causes the origin rod 20 to drive the extrusion member 32 to produce an extrusion effect on each pressure member 33, so that the two locking rods 31 corresponding to each row of non-origin rods 21 are separated from each other. In this way, the non-origin rods 21 is not locked at this time. Based on the gravity of the workpiece and the different external structures, the downward movement distance of the non-origin position rod body 21 is different. After the workpiece is placed stably, the probe part of the measuring machine 10 moves upward along the z-axis to remove the downward pressure on the tray 200. Then, under the rebound force of the third elastic member, the origin position rod body 20 drives the extrusion member 32 to remove the extrusion effect on the pressure-bearing member 33. Then, the two locking rods 31 corresponding to each row of non-origin position rod bodies 21 are connected with the corresponding locking grooves 30 under the rebound force of the second elastic member, and the non-origin position rod body 21 is locked at this time. At this time, when the workpiece is subjected to the contact force of the probe, there will be basically no shaking problem.

[0043] Preferably, a rubber ball 24 is provided at the end of the non-origin rod 21 that contacts the workpiece. During the measurement stroke of the measuring machine 10 on the workpiece, the force exerted when the probe contacts the workpiece is insufficient to squeeze the rubber ball 24 through the workpiece to cause elastic deformation.

[0044] In an optional embodiment, the radial dimension of the rubber ball 24 is larger than the radial dimension of the contact portion between the non-origin position rod 21 and the measuring platform 1, and a reset plate 25 is also provided on the measuring platform 1 for sliding along the z-axis direction. The reset plate 25 is in sliding contact with each support rod. After the workpiece is removed from the measuring platform 1, the reset plate 25 is pulled along the z-axis to drive each non-origin position rod 21 back to its initial position.

[0045] Furthermore, a second friction block 26 is provided in the radially sliding portion of the non-origin position rod body 21 that contacts the measuring platform 1. Based on the dynamic action of the rubber ball 24, the second friction block 26 tends to approach the first friction block 23. A screw 27 is provided for rotation inside the non-origin position rod body 21. A first extrusion block 28 is screwed onto the screw 27. A second extrusion block 29 is provided on the screw 27 for axial sliding. A fifth elastic member is provided between the first extrusion block 28 and the second extrusion block 29. The rubber ball 24 is screwed onto the end of the screw 27. During the rotation of the rubber ball 24, the extrusion block produces a radial extrusion effect on the second friction block 26.

[0046] Specifically, in the aforementioned embodiment, the friction between the first friction block 23 and the non-origin rod 21 is used to realize adaptive support of the workpiece. However, as the first friction block 23 and the non-origin rod 21 wear, the elastic force applied to the first friction block 23 by the first elastic member decreases, and the friction force between the first friction block 23 and the non-origin rod 21 will decrease. Therefore, in this embodiment, a second friction block 26 is provided on each non-origin rod 21 along the radial sliding direction. During the rotation of the screw 27, the first extrusion block 28 is driven to move in the direction close to the second extrusion block 29, and the second extrusion block 29 is driven to move. An extrusion block 28 squeezes the second extrusion block 29 to move axially through the fifth elastic member. The wedge-shaped fit between the second extrusion block 29 and the second friction block 26 realizes the extrusion action, so that the second friction block 26 tends to move radially away from the screw 27, that is, the distance between the second friction block 26 and the first friction block 23 becomes smaller. In this way, whenever the first friction block 23 and the second friction block 26 cannot provide the required friction force due to wear, the distance between the second friction block 26 and the first friction block 23 can be reduced by rotating the rubber ball 24, thereby better providing adaptive support for the workpiece.

[0047] In another embodiment of the present invention, a fourth elastic member is provided between the first ring body 22 and the measuring platform 1, and a plug-in mechanism is provided between the first ring body 22 and the non-origin position rod body 21; when the gravity of the workpiece is insufficient to overcome the elastic force of the fourth elastic member, the plug-in mechanism disconnects the connection between the first ring body 22 and the non-origin position rod body 21, and the non-origin position rod body 21 supports the workpiece by using the friction force between the first friction block 23 and the second friction block 26; when the gravity of the workpiece is sufficient to overcome the elastic force of the fourth elastic member, the plug-in mechanism connects the first ring body 22 and the non-origin position rod body 21, and the non-origin position rod body 21 supports the workpiece by using the elastic force of the fourth elastic member.

[0048] Specifically, in the aforementioned embodiment, the friction force between the first friction block 23 and the second friction block 26 is used to achieve adaptive support of the workpiece, but there is a problem, that is, in the process of placing the workpiece on the measuring platform 1, it is difficult to ensure that the workpiece is completely placed on the measuring platform 1 along the z-axis. Therefore, in the process of the workpiece contacting the non-origin position rod 21, as long as the workpiece shakes and tilts, there will be a situation where the rubber ball 24 corresponding to the non-origin position rod 21 is not in contact with the workpiece. When measuring the workpiece, the contact force of the probe on the workpiece surface will still cause the workpiece to shake.

[0049] Therefore, in this embodiment, a fourth elastic member is provided between the first ring body 22 and the measuring platform 1, and then the workpiece to be measured is classified according to different gravity. One type is that the gravity of the workpiece to be measured can cause the fourth elastic member to undergo elastic deformation, that is, when the workpiece is placed on the measuring platform 1, based on the elastic force of the fourth elastic member, each rubber ball 24 corresponding to the non-origin position rod body 21 can basically maintain contact with the workpiece. Even if the workpiece shakes and tilts, the rubber ball 24 can contact the workpiece surface again under the elastic force of the fourth elastic member. The other type is that the gravity of the workpiece to be measured cannot cause the fourth elastic member to undergo elastic deformation. At this time, the first friction block is used. The friction force between 23 and the second friction block 26 realizes adaptive support for the workpiece. If the gravity of the workpiece is not sufficient to overcome the friction force, an external force can be applied to the workpiece so that the workpiece can overcome the friction force. For example, the gravity required for elastic deformation of the fourth elastic member is greater than 10 unit forces, and the gravity required to overcome the friction force is less than 11 unit forces and greater than 1 unit force. For workpieces with a force greater than 10 unit forces and less than 11 unit forces, the fourth elastic member is preferably used. For workpieces with a force less than 1 unit force, other external forces are applied to enable the non-origin rod body 21 to move.

[0050] In this way, when adaptive support is achieved according to the different gravity of the workpiece, the elastic force and friction force of the fourth elastic member need to be switched, that is, a plug-in mechanism is provided between the first ring body 22 and the non-origin position rod body 21, and the plug-in mechanism includes a plug-in groove 210 opened on the non-origin position rod body 21, and a second ring body 211 is axially slidably sleeved on the first ring body 22, and the second ring body 211 is connected to the two locking rods 31 at the corresponding positions by a transmission rod 212; the second ring body 211 has on the first ring body 22: in the first position, when the gravity of the workpiece is not enough to overcome the elastic force of the fourth elastic member, the second ring body 211 does not produce an extrusion effect on the first friction block 23; in the second position, when the gravity of the workpiece is enough to overcome the elastic force of the fourth elastic member, the second ring body 211 squeezes the first friction block 23 into the plug-in groove 210.

[0051] During operation, when the gravity of the workpiece is not enough to overcome the elastic force of the fourth elastic member, the probe part of the measuring machine 10 squeezes the tray 200, so that the origin position rod body 20 drives the extrusion member 32 to squeeze the pressure member 33, so that the two locking rods 31 corresponding to each row of non-origin position rod bodies 21 are separated from each other, and the two locking rods 31 drive the corresponding second ring body 211 to move downward along the z-axis through the transmission rod 212 connected to each row, and the squeezing effect on the first friction block 23 is removed (the second ring body 211 is in the first position at this time), and the first friction block 23 moves in the direction away from the central axis of the non-origin position rod body 21 under the action of the rebound force of the first elastic member, but in the axial direction of the non-origin position rod body 21, the first friction block 23 moves in the direction away from the central axis of the non-origin position rod body 21. There is an overlapping part between the projections of the block 23 and the second friction block 26, that is, when the non-origin position rod body 21 is moved by the gravity of the workpiece, the first friction block 23 and the second friction block 26 maintain sliding friction contact, and at this time, the friction force is used to achieve adaptive support of the workpiece; when the non-origin position rod body 21 is locked, the two locking rods 31 corresponding to each row of non-origin position rod bodies 21 approach each other, and the second ring body 211 slides on the first ring body 22, which will produce an extrusion effect on the first friction block 23 again. In this process, the first friction block 23 will squeeze the second friction block 26, and the second friction block 26 will squeeze the second extrusion block 29, and the second extrusion block 29 compresses the fifth elastic member.

[0052] When the gravity of the workpiece is sufficient to overcome the elastic force of the fourth elastic member, the force of the probe part of the measuring machine 10 squeezing the tray 200 is reduced, but the squeezing effect still exists, that is, although the second ring body 211 moves downward along the z-axis, the downward distance is not enough to remove the squeezing effect on the first friction block 23 (the second ring body 211 is in the second position at this time), then the first friction block 23 will be plugged into the corresponding socket 210 on the non-origin position rod body 21. When the non-origin position rod body 21 is moved by the gravity of the workpiece, the non-origin position rod body 21 drives the first ring body 22 to move together. During this process, the second ring body 211 slides on the first ring body 22, but the second ring body 211 will not be separated from the squeezing effect on the first friction block 23. At this time, the elastic force of the fourth elastic member is used to achieve adaptive support for the workpiece.

[0053] The above descriptions of certain exemplary embodiments of the present invention are provided by way of illustration only. It is understood that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the present invention.

Claims

1. A laboratory dimensional measuring device comprising a measuring platform and a measuring machine mounted on the measuring platform, wherein the measuring machine measures a workpiece in a three-dimensional space consisting of an x-axis, a y-axis, and a z-axis, and wherein: Also includes: A passive support assembly comprising a plurality of support rods, each of which is movably arranged along the z-axis on the measuring platform, and a locking mechanism is also provided on the measuring platform; When the workpiece is placed on the measuring platform, the multiple support rods move down different distances along the z-axis on the measuring platform according to the workpiece's external structure and the effect of gravity. When the measuring machine starts measuring operations, the locking mechanism locks and restricts the positions of the multiple support rods.

2. The laboratory dimensional measuring device according to claim 1, characterized in that: The multiple support rods are divided into origin rods and non-origin rods. A first ring body is provided at a position corresponding to each non-origin rod on the measuring platform. A first friction block is provided for sliding in a certain radial direction of the first ring body, and a first elastic member is provided between the first friction block and the first ring body in the sliding direction.

3. The laboratory dimensional measuring device according to claim 2, characterized in that: The end of the origin rod body facing the probe is provided with a tray, and a protection hole is opened at the center of the tray. When the measuring machine is at the origin position, the tray abuts against the part connected to the probe, and the probe is inserted into the protection hole.

4. The laboratory dimensional measuring device according to claim 2, characterized in that: The non-origin position rod body is divided into multiple rows in sequence along the y-axis direction; the locking mechanism includes a plurality of locking grooves opened along the z-axis direction on each non-origin position rod body, and locking rods are provided on both sides of each row of non-origin position rod bodies, and a second elastic member is provided between the two locking rods. Based on the elastic force of the second elastic member, the two locking rods tend to approach each other and be plugged into the corresponding locking grooves; a third elastic member is provided between the origin position rod body and the measuring platform, an extrusion member is installed on the origin position rod body, and a pressure member is provided on each locking rod; based on the extrusion effect of the measuring machine on the origin position rod body along the z-axis direction, during the stroke in which the extrusion member extrudes the pressure member, the locking rod and the corresponding locking groove move away from each other to release the lock of the non-origin position rod body.

5. The laboratory dimensional measuring device according to claim 4, characterized in that: A rubber ball is provided at the end of the non-origin rod body that contacts the workpiece. During the measuring stroke of the measuring machine on the workpiece, the force exerted when the probe contacts the workpiece is not sufficient to squeeze the rubber ball through the workpiece to cause elastic deformation.

6. The laboratory dimensional measuring device according to claim 5, characterized in that: The radial dimension of the rubber ball is larger than the radial dimension of the contact part between the non-origin rod and the measuring platform, and a reset plate is also provided on the measuring platform for sliding along the z-axis direction. The reset plate is in sliding contact with each support rod. After the workpiece is removed from the measuring platform, the reset plate is pulled along the z-axis to drive each non-origin rod back to its initial position.

7. The laboratory dimensional measuring device according to claim 5, characterized in that: The portion of the non-origin rod body that contacts the measuring platform is provided with a second friction block that slides radially. Based on the dynamic action of the rubber ball, the second friction block tends to approach the first friction block.

8. The laboratory dimensional measuring device according to claim 7, characterized in that: A screw is provided for rotation inside the non-origin rod body, a first extrusion block is screwed onto the screw, a second extrusion block is provided on the screw for sliding along the axial direction, a fifth elastic member is provided between the first extrusion block and the second extrusion block, and a rubber ball is screwed onto the end of the screw. During the rotation of the rubber ball, the extrusion block produces a radial extrusion effect on the second friction block.

9. The laboratory dimensional measuring device according to claim 8, characterized in that: A fourth elastic member is provided between the first ring body and the measuring platform, and a plug-in mechanism is provided between the first ring body and the non-origin position rod body; when the gravity of the workpiece is insufficient to overcome the elastic force of the fourth elastic member, the plug-in mechanism disconnects the connection between the first ring body and the non-origin position rod body, and the non-origin position rod body supports the workpiece by using the friction force between the first friction block and the second friction block; when the gravity of the workpiece is sufficient to overcome the elastic force of the fourth elastic member, the plug-in mechanism connects the first ring body and the non-origin position rod body, and the non-origin position rod body supports the workpiece by using the elastic force of the fourth elastic member.

10. The laboratory dimensional measuring device according to claim 9, characterized in that: The plug-in mechanism includes a plug-in groove opened on the rod body at a non-origin position, a second ring body is axially slidably sleeved on the first ring body, and the second ring body is connected to the two locking plug rods at corresponding positions by a transmission rod; the second ring body has on the first ring body: in the first position, when the gravity of the workpiece is not sufficient to overcome the elastic force of the fourth elastic member, the second ring body does not produce an extrusion effect on the first friction block; in the second position, when the gravity of the workpiece is sufficient to overcome the elastic force of the fourth elastic member, the second ring body squeezes the first friction block into the plug-in groove.

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