A closed-loop three-dimensional coordinate precision measuring device

Abstract

The application relates to the technical field of measuring devices, and discloses a closed-loop three-dimensional coordinate precision measuring device, which comprises a base, the upper side of the base is provided with a device body, the lower end of a Z-axis adjusting arm of the measuring device body is provided with a measuring seat, the lower end of the measuring seat is fixedly provided with a measuring head through magnetic attraction, the inner wall of a replacement shell is rotationally provided with a placing rack, an odd number of placing grooves for placing the measuring head are arranged in the inner wall of the placing rack, one side of the placing rack away from the placing grooves is provided with an inlet and outlet one, the upper side of the replacement shell is provided with an inlet and outlet two, and the other side of the cleaning plate is fixedly provided with a wiping layer for wiping the measuring head. During the process of automatically replacing the measuring head through the inlet and outlet one and the inlet and outlet two in cooperation with the placing rack, the measuring head can be in contact with the wiping layer of the cleaning plate, so that the cleaning function of the measuring head before and after replacement is realized on the basis of realizing the automatic replacement of the measuring head.

Description

Technical Field

[0001] This invention relates to the field of measuring device technology, specifically to a closed-loop three-dimensional coordinate precision measuring device. Background Technology

[0002] Coordinate measuring machines (CMMs) are widely used in industries such as machinery, electronics, instrumentation, and plastics. They are one of the most effective methods for measuring and obtaining dimensional data because they can replace various surface measuring tools and expensive combination gauges, and reduce the time required for complex measurement tasks from hours to minutes, effectively improving measurement accuracy and efficiency.

[0003] Traditional coordinate measuring machines (CMMs) typically require manual operation when changing probes. The specific steps involve using two screwdrivers, inserting them into small holes on the probe and extension rod respectively, holding the screwdriver on the extension rod with one hand, and turning the screwdriver on the probe counterclockwise to remove the probe for replacement. Some other devices automatically change probes by setting up a probe holder and using the magnetic attraction function between the measuring device and the probe holder.

[0004] However, the above replacement method has the following problems: First, manual replacement is cumbersome and inefficient, prone to errors due to human factors, and contamination due to hand contact with the measuring head, which seriously affects measurement accuracy and efficiency; Second, when multiple probes are installed on the existing probe holder, there is no protection, and the probes are easily bumped by external factors, resulting in a decrease in accuracy; Third, when replacing probes, manual cleaning of the probes is required, which is inefficient and can easily damage the probes. Summary of the Invention

[0005] To address the shortcomings of existing technologies and solve the aforementioned technical problems, this invention provides a closed-loop three-dimensional coordinate precision measurement device.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a closed-loop three-dimensional coordinate precision measuring device, including a base, a device body is provided on the upper side of the base, a measuring seat is provided at the lower end of the Z-axis adjusting arm of the measuring device body, a measuring head is magnetically fixed at the lower end of the measuring seat, and a replacement component is provided on the upper side of the base.

[0007] The replacement assembly includes a replacement housing fixed to the upper side of the base. The inner wall of the replacement housing has a rotatable placement rack. The inner wall of the placement rack has an odd number of placement slots for placing measuring heads. The side of the placement rack away from the placement slots has an inlet / outlet one. The upper side of the replacement housing has an inlet / outlet two. The inner wall of the replacement housing is provided with a cleaning assembly.

[0008] The cleaning assembly includes a cleaning plate disposed on the inner wall of the replacement housing. One side of the cleaning plate is attached to the inner wall of the inlet / outlet 2, and the other side of the cleaning plate is fixed with a wiping layer for wiping the measuring head.

[0009] Through the above technical solution, during the automatic replacement of the measuring head, the measuring head can come into contact with the wiping layer of the cleaning plate, thereby realizing not only the automatic replacement of the measuring head, but also the cleaning function of the measuring head before and after replacement.

[0010] Preferably, the measuring head is threadedly connected to an extension rod on its lower side, and the lower end of the extension rod is threadedly connected to a probe. The probes are of different sizes, and the wiping layer on the cleaning plate is used to wipe the probes.

[0011] Preferably, a plurality of adjusting blocks are uniformly fixed on the outer wall of the placement frame. The adjusting blocks are located below the inlet / outlet one. A plurality of supporting slide rods that slide on the inner wall of the replacement housing are fixed on one side of the cleaning plate. A spring is sleeved on the outer wall of the supporting slide rod and fixed between the inner wall of the replacement housing and the outer wall of the cleaning plate. There are two cleaning plates, which are respectively attached to the inner walls of the two sides of the inlet / outlet two. The inner bottom wall of the replacement housing is provided with an upward push block that slides against the outer wall of the adjusting block. The upper inclined surface of the upward push block slides against the outer wall between the two cleaning plates. When there is only vertical pressure between the adjusting block and the upward push block, the gap between the two cleaning plates matches the probe size of the probe on the opposite side of the adjusting block.

[0012] Preferably, the inner wall of the placement rack is provided with a plunger-type electromagnet whose output end passes through the inner wall of the placement slot, the inner wall of the placement rack is provided with a pressure sensor located on the inner wall of the placement slot, and the outer wall of the measuring head is provided with a limiting hole that slides to cooperate with the output end of the plunger-type electromagnet.

[0013] Preferably, two fitted gap plates are fixed to the sidewall between the two cleaning plates. The width of the gap plates is a preset value, so that the sum of the widths of the two gap plates can match the smallest probe being wiped clean when it passes through the wiping layer.

[0014] Preferably, the inner wall of the replacement housing is provided with a dust collection assembly, the dust collection assembly includes a scraper that rotates between the inner walls on both sides of the replacement housing, a guide slide rod is fixed to the outer wall of the scraper, and a wave groove is formed on the outer wall of the placement rack. The vertical projection of the wave groove is wave-shaped, the crest of the wave groove is flush with the inlet and outlet, and the trough of the wave groove is located in the middle of the adjacent inlet and outlet and the placement groove.

[0015] Preferably, the outer walls of the gap plate, scraper and push block are all provided with negative pressure holes, and a negative pressure machine is provided on the outer wall of the replacement housing. The output end of the negative pressure machine is fixedly provided on the inner bottom wall of the inlet and outlet.

[0016] Preferably, a guide rod is fixed to the inner bottom wall of the replacement housing, the outer wall of the guide rod is slidably connected to the inner wall of the upper push block, and the upper end of the guide rod is fitted to the lower side of the scraper.

[0017] Preferably, the inner wall of the replacement housing is provided with a rotating groove, and the outer wall of the adjusting block and the inner wall of the rotating groove are pre-set with a distance.

[0018] Preferably, a motor is fixed to the lower side of the replacement housing, and the motor is used to drive the placement rack to rotate.

[0019] This invention provides a closed-loop three-dimensional coordinate precision measurement device. It has the following advantages:

[0020] 1. In the process of automatically changing the measuring head by means of the device body through the placement frame of inlet and outlet one and inlet and outlet two, the measuring head can come into contact with the wiping layer of the cleaning plate, thereby realizing the function of cleaning the measuring head before and after the replacement, in addition to realizing the automatic replacement of the measuring head.

[0021] 2. This invention achieves a one-to-one matching between the measuring head and the adjusting block, and by rotating the placement frame, the adjusting block is driven to push the upper block upward, opening the cleaning plate to the width that matches the measuring head. Thus, while cleaning the measuring head during replacement, the distance between the two cleaning plates is also automatically adjusted.

[0022] 3. The present invention increases the length of the cleaning plate by extending the plate, thereby reducing the upward movement distance of the push block, providing clearance for the probe to pass through, and by setting two gap plates, reducing the pressure between the wiping layers on the two cleaning plates, while also facilitating the upward movement of the push block to open the cleaning plate.

[0023] 4. The present invention, through the cooperation of the wave groove and the guide slide rod, enables the scraper to remove dust from the wiping layer on both sides during the rotation of the placement frame. The setting of the wave crests and troughs of the wave groove ensures that the dust removal function does not affect the cleaning and replacement of the measuring head, thereby realizing the alternation of probe cleaning and wiping layer dust removal.

[0024] 5. The present invention provides support for the scraper by means of a guide rod, so that when the guide rod is at the crest position, the lower side of the scraper is always flush with the upper side of the gap plate, and the height of the guide rod is always below the crest of the wave groove, thereby avoiding interference with the movement of the placement frame. Thus, while guiding the upper push block with the guide rod, the scraper is also limited. Attached Figure Description

[0025] Figure 1 This is a perspective view of the present invention;

[0026] Figure 2 This is a schematic diagram of the replacement component structure of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a partial cross-sectional view of the replacement housing of the present invention;

[0029] Figure 5 This is a schematic diagram of the cleaning component structure of the present invention;

[0030] Figure 6 This is a three-dimensional structural diagram of the placement rack of the present invention;

[0031] Figure 7 This is a three-dimensional exploded view of the cleaning component of the present invention;

[0032] Figure 8 This is a schematic diagram of the three-dimensional structure of the measuring head of the present invention.

[0033] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0034] Among them, 1. Base;

[0035] 2. Replace components; 20. Replace housing; 21. Placement rack; 22. Placement slot; 23. Inlet / outlet one; 24. Inlet / outlet two; 25. Plunger electromagnet; 26. Pressure sensor; 27. Motor; 28. Rotating slot; 29. ​​Limiting hole;

[0036] 3. Device body; 4. Measuring head; 40. Extension rod; 41. Probe;

[0037] 5. Cleaning assembly; 50. Cleaning plate; 51. Extension plate; 52. Push block; 53. Spring 1; 54. Support slide bar; 55. Gap plate; 56. Guide rod; 57. Adjusting block;

[0038] 6. Ash collection assembly; 60. Scraper; 61. Guide slide bar; 62. Corrugated chute;

[0039] 7. Negative pressure machine; 8. Negative pressure port. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1, please refer to the appendix. Figure 1 - Appendix Figure 4 This invention provides a closed-loop three-dimensional coordinate precision measuring device, including a base 1, a device body 3 on the upper side of the base 1, a measuring seat at the lower end of the Z-axis adjusting arm of the measuring device body 3, a measuring head 4 magnetically fixed at the lower end of the measuring seat, and a replacement component 2 on the upper side of the base 1.

[0042] The replacement component 2 includes a replacement housing 20 fixed to the upper side of the base 1. The inner wall of the replacement housing 20 has a rotatable placement rack 21. The inner wall of the placement rack 21 has an odd number of placement slots 22 for placing the measuring head 4. The side of the placement rack 21 away from the placement slots 22 has an inlet and outlet 23. The upper side of the replacement housing 20 has an inlet and outlet 24. The inner wall of the replacement housing 20 is provided with a cleaning component 5.

[0043] The cleaning assembly 5 includes a cleaning plate 50 disposed on the inner wall of the replacement housing 20. One side of the cleaning plate 50 is attached to the inner wall of the inlet / outlet 24, and the other side of the cleaning plate 50 is fixed with a wiping layer for wiping the measuring head 4.

[0044] Specifically, along the diameter of the placement rack 21, the placement slot 22 and the inlet / outlet 23 correspond one-to-one. The device body 3 is a coordinate measuring machine and also includes a controller. The wiping layer is made of natural black horsehair and horse mane, with a single bristle diameter of 0.08-0.12 mm and a fluffy hair planting depth of 8-10 mm.

[0045] During initial use, the controller assigns a system number to each placement slot 22 and measuring head 4. Then, the device body 3 drives the Z-axis adjusting arm to move the measuring seat above the measuring head 4 to be loaded. The device body 3 adjusts itself so that the measuring seat attracts the measuring head 4, thus completing the installation of the measuring head 4. When replacement is required, the device body 3 places the originally loaded measuring head 4 back to its original position, moves to the position of the measuring head 4 to be loaded, and reloads it, thus completing the replacement.

[0046] In addition, during replacement, the device body 3 controls the measuring seat to carry the measuring head 4 into the interior of the placement rack 21 through inlet / outlet 24 and inlet / outlet 23. During this process, the device body 3 adjusts itself to make the measuring head 4 contact the wiping layer on the cleaning plate 50, thereby cleaning the measuring head 4 during the replacement process.

[0047] Subsequently, the device body 3 controls the measuring seat to move along the diameter of the placement frame 21 to the opposite side of the inlet / outlet 23, and places the measuring head 4. Then, through the rotational cooperation of the placement frame 21 and the replacement housing 20, the new measuring head 4 is moved to the position opposite the inlet / outlet 24, that is, below the measuring seat. With the cooperation of the device body 3, the loading of the new measuring head 4 is completed. Then, the device body 3 controls the measuring head 4 to pass through the inlet / outlet 23 and the inlet / outlet 24 again. During this process, the measuring head 4 is cleaned. Thus, on the basis of realizing the automatic replacement of the measuring head 4, the cleaning function of the measuring head 4 before and after replacement is also realized.

[0048] Please see the appendix Figure 1 and attached Figure 8 The measuring head 4 has an extension rod 40 threadedly connected to its lower side, and a probe 41 is threadedly connected to the lower end of the extension rod 40. The probes 41 are of different sizes, and the wiping layer on the cleaning plate 50 is used to wipe the probes 41.

[0049] Specifically, there are various types of probes 41. In this embodiment, all probes 41 are rod-shaped. Traditionally, when replacing them, the probes 41 and extension rods 40 are removed separately using tools, and then other types of extension rods 40 and probes 41 are replaced. The replacement steps are cumbersome. In this embodiment, the measuring head 4, which is equipped with extension rods 40 and probes 41, is replaced as a whole using magnetic attraction, which can realize automatic replacement and thus improve the replacement efficiency.

[0050] Example 2, please refer to the appendix. Figure 4 - Appendix Figure 7 Based on the above embodiment, by programming the path of the device body 3, the device body 3, along with the probe 41 and the wiping layer, rubs to clean the probe 41. However, due to the different sizes of the probes 41, the movement path of each probe 41 is different, which not only easily causes system errors but also easily damages the probes 41. This embodiment proposes the following solution to solve the above problems: several adjusting blocks 57 are evenly fixed on the outer wall of the placement frame 21. The adjusting blocks 57 are located below the inlet / outlet 23. Several supporting slides that slide on the inner wall of the replacement housing 20 are fixed on one side of the cleaning plate 50. The outer wall of the rod 54, which supports the slide rod 54, is fitted with a spring 53 that is fixed between the inner wall of the replacement housing 20 and the outer wall of the cleaning plate 50. There are two cleaning plates 50, which are respectively fitted to the inner walls of the two sides of the inlet and outlet 24. The inner bottom wall of the replacement housing 20 is provided with an upper push block 52 that slides against the outer wall of the adjusting block 57. The upper inclined surface of the upper push block 52 slides against the outer wall between the two cleaning plates 50. When there is only vertical pressure between the adjusting block 57 and the upper push block 52, the gap between the two cleaning plates 50 matches the probe size of the probe 41 on the opposite side of the adjusting block 57.

[0051] Specifically, the side view projection of the adjusting block 57 is L-shaped, and it is set as an inclined surface along the rotation direction of the placement frame 21; the pushing block 52 consists of two parts: the part that pushes the two cleaning plates 50 open is projected as an isosceles triangle with a cavity at the bottom, and the other part that is fixed to one part is a near-right triangle with the hypotenuse opposite to the rotation direction of the placement frame 21, so that it interacts with the inclined surface of the adjusting block 57 and can move itself upward; the thickness of the part where each adjusting block 57 and the pushing block 52 slides against each other is different and is a preset value, so that when the adjusting block 57 pushes the pushing block 52 to the maximum height, the pushing block 52 pushes the two cleaning plates 50 open, and the distance between the two cleaning plates 50 is such that when the probe 41 corresponding to the adjusting block 57 passes through the wiping layer, the probe 41 inserts into the wiping layer a distance of 4-8 mm depending on the diameter of the probe 41, and does not touch the body of the cleaning plate 50;

[0052] When replacing the measuring head 4, the device body 3 moves along the diameter line of the placement frame 21 through the inlet and outlet 24 and the inlet and outlet 23. At this time, the inlet and outlet 23 corresponds to the measuring head 4 mounted on the device body 3, so the corresponding placement slot 22 is idle. At this time, the adjustment block 57 below the inlet and outlet 23 causes the push block 52 to move upward, thereby causing the two cleaning plates 50 to overcome the elastic potential energy of the spring 53. Through the sliding connection between the support slide rod 54 and the replacement housing 20, the two cleaning plates 50 are opened, allowing the probe 41 on the device body 3 to pass through. When passing through, the probe 41 extends into the wiping layer a certain distance, thereby cleaning the probe 41.

[0053] After cleaning, the device body 3 continues to move and places the measuring head 4 on the placement slot 22. Then, by rotating the placement frame 21, the measuring head 4 to be loaded is moved to the measuring seat under the device body 3. At this time, the adjustment block 57 below the inlet and outlet 1 23 matches the width of the two cleaning plates 50 to the size of the probe 41 on the measuring head 4 to be loaded. After the measuring head 4 is loaded, it passes through inlet and outlet 1 23 and inlet and outlet 24. During this process, the newly loaded measuring head 4 is cleaned. Thus, while cleaning the measuring head 4 during the replacement process, the spacing between the two cleaning plates 50 is also automatically adjusted, which helps to improve the replacement and cleaning efficiency of the measuring head 4.

[0054] Please see the appendix Figure 2 and attached Figure 3 The inner wall of the placement rack 21 is provided with a plunger electromagnet 25 whose output end passes through the inner wall of the placement groove 22. The inner wall of the placement rack 21 is provided with a pressure sensor 26 located on the inner wall of the placement groove 22. The outer wall of the measuring head 4 is provided with a limiting hole 29 that slides with the output end of the plunger electromagnet 25.

[0055] Specifically, based on the above embodiments, there is a problem that the measuring head 4 on the placement slot 22 may rotate due to the rotation of the placement frame 21 or the external environment. Since the suction cup of the measuring head seat is a positioning claw disk structure with three steel balls and V groove, there is only one correct alignment angle around the circumference, which may lead to the inability to load or the need for recalibration after loading.

[0056] To solve the above problems, the outer side of the limiting hole 29 is a trumpet hole with an upper and lower elliptical shape, and the inner side is a hole with an upper and lower elliptical shape, which restricts the rotation of the measuring head 4, but allows the measuring head 4 to have a small displacement in the vertical direction; by driving the plunger electromagnet 25, its output end is inserted into the limiting hole 29 to complete the limiting of the measuring head 4 and avoid the above problems.

[0057] Meanwhile, when the measuring seat places the measuring head 4 on the placement slot 22, the pressure sensor 26 senses the presence of the measuring head 4 and sends a feedback signal. The controller then controls the plunger electromagnet 25 to limit the measuring head 4. When a new measuring head 4 is loaded, there is no pressure between the measuring head 4 and the pressure sensor 26 during the upward movement of the measuring seat adsorbing the measuring head 4. At this time, the output end of the plunger electromagnet 25 slides in the limiting hole 29. The controller then controls the output end of the plunger electromagnet 25 to retract, releasing the limit on the measuring head 4. This solves the problem of the measuring head 4 being unable to be loaded or requiring recalibration after loading.

[0058] Example 3, please refer to the appendix. Figure 5 and attached Figure 7 Based on the above embodiment, when the adjusting block 57 and the pushing block 52 are not in contact, the two cleaning plates 50 are stuck together under the action of the spring 53. At this time, the wiping layer will be squeezed, affecting the cleaning effect of the wiping layer. This embodiment proposes the following solution to solve the above problem: two gap plates 55 are fixedly attached to the side wall between the two cleaning plates 50. The width of the gap plate 55 is a preset value, so that the sum of the widths of the two gap plates 55 can match the probe of the smallest probe 41 being wiped clean when it passes through the wiping layer.

[0059] Specifically, an extension plate 51 is fixed to the lower side of the cleaning plate 50, so that the push block 52 can reduce its upward movement distance when opening the cleaning plate 50, providing clearance for the probe 41 to pass through. The setting of the two gap plates 55 can reduce the pressure between the wiping layers on the two cleaning plates 50, thereby avoiding damage to the fluffiness of the wiping layer due to long-term pressure and affecting the subsequent cleaning effect.

[0060] Example 4, please refer to the appendix. Figure 5 - Appendix Figure 7Based on the above embodiments, the wiping layer on the cleaning plate 50 needs to be manually removed and cleaned after a certain period of use, which is not only time-consuming and laborious but also inefficient. This embodiment provides the following solution to solve the above problems: the inner wall of the replacement housing 20 is provided with a dust collection component 6, which includes a scraper 60 that rotates between the inner walls on both sides of the replacement housing 20. The outer wall of the scraper 60 is fixed with a guide slide rod 61. The outer wall of the placement rack 21 is provided with a wave groove 62. The vertical projection of the wave groove 62 is wave-shaped. The crest of the wave groove 62 is flush with the inlet / outlet 23, and the trough of the wave groove 62 is located in the middle of the adjacent inlet / outlet 23 and the placement groove 22.

[0061] Specifically, the scraper 60 is rotatably connected to the replacement housing 20 via a rotating rod, and the guide slide rod 61 is fixed on the rotating rod. When the inlet and outlet 1 23 and the inlet and outlet 24 connect the inlet, the adjusting block 57 pushes the upper push block 52 upward. The guide slide rod 61 just slides out of the wave groove 62 and is located in the inlet and outlet 1 23. When the adjusting block 57 slides past the upper push block 52 and the upper push block 52 releases its pressure on the cleaning plate 50, the guide slide rod 61 slides back into the wave groove 62 and begins to rotate to remove dust from the wiping layer.

[0062] The width of the scraper 60 is less than the sum of the widths of the two gap plates 55. When cleaning the probe 41, the placement frame 21 does not rotate, and the guide slide rod 61 is located at the crest of the wave groove 62. At this time, the lower side of the scraper 60 is in contact with the two gap plates 55 and does not interfere with the movement of the probe 41. When a new measuring head 4 needs to be loaded, the placement frame 21 rotates, so that the new measuring head 4 moves to the bottom of the measuring seat. As the placement frame 21 rotates, the guide slide rod 61 completes at least one crest-trough-crest process. Then, the inner wall of the wave groove 62 will squeeze the guide slide rod 61 and drive the scraper 60 to rotate, so that the scraper 60 scrapes and removes dust from the wiping layer on both sides. When loading a new measuring head 4, the guide slide rod 61 is located at a new crest. Thus, when the probe 41 is removed from the placement frame 21, the scraper 60 will still not interfere with the cleaning of the probe 41, thereby realizing the alternation of cleaning the probe 41 and cleaning the wiping layer.

[0063] Please see the appendix Figure 2 and attached Figure 7 Negative pressure holes 8 are provided on the outer walls of the gap plate 55, scraper 60 and push block 52. A negative pressure machine 7 is installed on the outer wall of the replacement housing 20. The output end of the negative pressure machine 7 is fixedly installed on the inner bottom wall of the inlet and outlet 24.

[0064] Specifically, the bottom chamber of the push block 52 is located above the output end of the negative pressure machine 7. The chamber of the push block 52 is connected to the negative pressure hole 8 above it, so that the negative pressure machine 7 forms a negative pressure area below the inlet and outlet 24. When the scraper 60 cleans the wiping layer, the cleaned dust will enter the chamber through the negative pressure hole 8 and be drawn away by the negative pressure machine 7, so as to prevent the probe 41 from re-adhering to dust when it moves, thereby realizing the dust cleaning and dust collection functions of the dust collection component 6.

[0065] Example 5, please refer to the appendix. Figure 5 In the above embodiment, the crest of the wave groove 62 is flush with the inlet and outlet 23. At this time, the guide rod 61 is located in the inlet and outlet 23 without interference above. If it is to accommodate a larger probe 41, the space opened by the two cleaning plates 50 is larger. At this time, the scraper 60 will rotate to the bottom of the gap plate 55. This will cause the guide rod 61 to be unable to enter the wave groove 62 when the placement frame 21 rotates again, making it impossible to complete the switching of the new measuring head 4. This embodiment proposes the following solution to solve the above problem: replace the inner bottom wall of the housing 20 with a guide rod 56. The outer wall of the guide rod 56 is slidably connected to the inner wall of the upper push block 52. The upper end of the guide rod 56 is attached to the lower side of the scraper 60.

[0066] Specifically, the guide rod 56 guides the vertical movement of the push block 52, thereby providing stability when the cleaning plate 50 is opened. In addition, the guide rod 56 provides support for the scraper 60, so that when the guide slide rod 61 is at the crest position, the lower side of the scraper 60 is always flush with the upper side of the gap plate 55, and the height of the guide slide rod 61 is always below the crest of the wave groove 62, thus avoiding movement interference with the placement frame 21. Therefore, while guiding the push block 52, the guide rod 56 also limits the position of the scraper 60.

[0067] Please see the appendix Figure 6 The inner wall of the replacement housing 20 is provided with a rotating groove 28, and the outer wall of the adjusting block 57 and the inner wall of the rotating groove 28 are pre-set with a distance.

[0068] Specifically, the rotating groove 28 provides rotation space for multiple adjusting blocks 57, preventing them from drying out with the replacement housing 20, thereby improving the rationality of the device.

[0069] Please see the appendix Figure 4 A motor 27 is fixed to the lower side of the replacement housing 20. The motor 27 is used to drive the placement rack 21 to rotate.

[0070] Specifically, motor 27 is a high-precision servo motor or stepper motor. The controller controls motor 27 to drive the placement frame 21 to rotate, which helps to switch the measuring head 4.

[0071] Work process: When replacing the measuring head 4, the device body 3 moves the measuring head 4, and through the replacement housing 20, the inlet and outlet 24 and the inlet and outlet 23 extend into the placement rack 21, so that the measuring head 4 moves into the placement slot 22;

[0072] During this process, the adjustment block 57 below the placement rack 21 is first aligned with the work station, and the rotating and pressing push block 52 is lifted upward along the guide rod 56. The inclined surface opens the cleaning plates 50 on both sides, and the gap between the cleaning plates 50 is automatically adapted to the measuring head 4 loaded on the current device body 3. The probe 41 passes through the wiping layer between the two cleaning plates 50, and the device moves slightly up and down. The horsehair wiping layer completes the wiping of dust and oil on the outer wall of the probe 41. Then, the measuring head 4 enters the interior of the idle placement rack 21.

[0073] Next, the pressure sensor 26 is triggered by the pressure, and the controller drives the plunger electromagnet 25 to push out and engage with the measuring head limit hole 29, locking the measuring head to prevent it from shifting or moving. Then, the motor 27 drives the placement frame 21 to rotate, rotating the target specification measuring head 4 to the position directly below the measuring seat. During this process, the wave groove 62, which rotates synchronously with the placement frame 21, pushes the guide slide rod 61, causing the scraper 60 to swing back and forth, scraping away the accumulated debris from the cleaning plate 50. The negative pressure machine 7 continuously adsorbs and scrapes off the dust through the negative pressure holes 8 of the gap plate 55, the scraper 60, and the push block 52, and the dust is collected and discharged from the housing.

[0074] At this time, the adjusting block 57 of the measuring head 4 being loaded pushes up the push block 52 again, and the cleaning plate 50 automatically opens to fit the size of the new probe 41; the plunger electromagnet 25 receives the signal and retracts, releasing the locking of the measuring head 4; the measuring seat of the device body 3 uses magnetic attraction to lift the new measuring head 4 upward; the new probe 41 moves upward and passes through the wiping layer again, completing the second cleaning before replacement, and then is lifted out of the replacement housing 20 through the inlet and outlet 24; after the adjusting block 57 is separated from the push block 52, the spring 1 53 pulls the cleaning plate 50 to reset and close, and the gap plate 55 buffers to prevent the wiping layer from being excessively squeezed and deformed, thus completing one replacement action.

[0075] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A closed-loop three-dimensional coordinate precision measuring device, comprising a base (1), a device body (3) being disposed on the upper side of the base (1), a measuring seat being disposed at the lower end of the Z-axis adjusting arm of the measuring device body (3), and a measuring head (4) being magnetically fixed at the lower end of the measuring seat, characterized in that, A replacement component (2) is provided on the upper side of the base (1); The replacement assembly (2) includes a replacement housing (20) fixed on the upper side of the base (1). The inner wall of the replacement housing (20) has a rotatable placement rack (21). The inner wall of the placement rack (21) has an odd number of placement slots (22) for placing the measuring head (4). The side of the placement rack (21) away from the placement slots (22) has an inlet and outlet one (23). The upper side of the replacement housing (20) has an inlet and outlet two (24). The inner wall of the replacement housing (20) is provided with a cleaning assembly (5). The cleaning assembly (5) includes a cleaning plate (50) disposed on the inner wall of the replacement housing (20). One side of the cleaning plate (50) is attached to the inner wall of the inlet / outlet two (24), and the other side of the cleaning plate (50) is fixed with a wiping layer for wiping the measuring head (4).

2. The closed-loop three-dimensional coordinate precision measuring device according to claim 1, characterized in that, The measuring head (4) is threaded with an extension rod (40) on its lower side. The extension rod (40) is threaded with a probe (41) at its lower end. The probes (41) are of different sizes. The wiping layer on the cleaning plate (50) is used to wipe the probes (41).

3. The closed-loop three-dimensional coordinate precision measurement device according to claim 1, characterized in that, The outer wall of the placement rack (21) is uniformly fixed with several adjusting blocks (57). The adjusting blocks (57) are located below the inlet / outlet (23). One side of the cleaning plate (50) is fixed with multiple supporting slide rods (54) that slide on the inner wall of the replacement housing (20). The outer wall of the supporting slide rods (54) is fitted with a spring (53) that is fixed between the inner wall of the replacement housing (20) and the outer wall of the cleaning plate (50). There are two cleaning plates (50). The inner walls of the inlet and outlet (24) are respectively attached to each other. The inner bottom wall of the replacement housing (20) is provided with an upper push block (52) that slides against the outer wall of the adjustment block (57). The upper inclined surface of the upper push block (52) slides against the outer wall between the two cleaning plates (50). When there is only vertical pressure between the adjustment block (57) and the upper push block (52), the gap distance between the two cleaning plates (50) matches the probe size of the probe (41) on the opposite side of the adjustment block (57).

4. The closed-loop three-dimensional coordinate precision measuring device according to claim 1, characterized in that, The inner wall of the placement rack (21) is provided with a plunger electromagnet (25) whose output end passes through the inner wall of the placement groove (22). The inner wall of the placement rack (21) is provided with a pressure sensor (26) located on the inner wall of the placement groove (22). The outer wall of the measuring head (4) is provided with a limiting hole (29) that slides with the output end of the plunger electromagnet (25).

5. The closed-loop three-dimensional coordinate precision measuring device according to claim 3, characterized in that, Two fitted gap plates (55) are fixed to the sidewall between the two cleaning plates (50). The width of the gap plates (55) is a preset value, so that the sum of the widths of the two gap plates (55) can match the smallest probe (41) being wiped clean when it passes through the wiping layer.

6. The closed-loop three-dimensional coordinate precision measuring device according to claim 5, characterized in that, The inner wall of the replacement housing (20) is provided with a dust collection assembly (6). The dust collection assembly (6) includes a scraper (60) that rotates between the inner walls on both sides of the replacement housing (20). The outer wall of the scraper (60) is fixed with a guide slide rod (61). The outer wall of the placement rack (21) is provided with a wave groove (62). The vertical projection of the wave groove (62) is wave-shaped. The crest of the wave groove (62) is flush with the inlet / outlet (23). The trough of the wave groove (62) is located in the middle of the adjacent inlet / outlet (23) and the placement groove (22).

7. The closed-loop three-dimensional coordinate precision measuring device according to claim 6, characterized in that, The outer walls of the gap plate (55), scraper (60) and push block (52) are all provided with negative pressure holes (8), and the outer wall of the replacement housing (20) is provided with a negative pressure machine (7). The output end of the negative pressure machine (7) is fixedly installed on the inner bottom wall of the inlet and outlet (24).

8. The closed-loop three-dimensional coordinate precision measuring device according to claim 7, characterized in that, The inner bottom wall of the replacement housing (20) is fixed with a guide rod (56), the outer wall of the guide rod (56) is slidably connected to the inner wall of the upper push block (52), and the upper end of the guide rod (56) is attached to the lower side of the scraper (60).

9. A closed-loop three-dimensional coordinate precision measuring device according to claim 3, characterized in that, The inner wall of the replacement housing (20) is provided with a rotating groove (28), and the outer wall of the adjusting block (57) and the inner wall of the rotating groove (28) are pre-set with a distance.

10. A closed-loop three-dimensional coordinate precision measuring device according to claim 1, characterized in that, A motor (27) is fixed to the lower side of the replacement housing (20), and the motor (27) is used to drive the placement rack (21) to rotate.

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