Workpiece base for a three-axis coordinate measuring machine

Abstract

The application relates to the field of workpiece positioning machining, in particular to a workpiece base for a three-axis coordinate measuring machine, which comprises a positioning base body, a positioning blind hole is arranged on the positioning base body, a top positioning cavity and a mounting cavity in communication with the positioning blind hole, a connecting block is arranged in the top positioning cavity, a butt-joint assembly for extending into the positioning blind hole is slidably connected to the connecting block, a first elastic member is connected between the connecting block and the butt-joint assembly, an electromagnetic driving assembly is arranged in the top positioning cavity and the mounting cavity, and the electromagnetic driving assembly is used for driving the butt-joint assembly; a mounting blind hole is arranged in the positioning blind hole, a first proximity sensor is arranged in the mounting blind hole, a logic controller is connected to the first proximity sensor, and the logic controller is connected with the electromagnetic driving assembly. The application has the effect of improving the efficiency of positioning the workpiece on the preset detection position of the three-axis coordinate measuring machine.

Description

Workpiece base for three-axis coordinate measuring machine Technical Field

[0001] This application relates to the field of workpiece positioning and machining, and in particular to a workpiece base for a three-axis coordinate measuring machine. Background Technology

[0002] Currently, edge detection or precision detection of workpieces can be performed using a three-axis coordinate measuring machine. Before detection, the workpiece needs to be positioned in the preset detection position using a support fixture used in conjunction with the three-axis coordinate measuring machine.

[0003] An existing support fixture includes a circular support base for supporting a workpiece. Several abutment positioning strips are hinged to the edge of the circular support base and are evenly distributed along the edge of the circular support base. A return spring connects the abutment positioning strips to the top wall of the circular support base. Driven by the return spring, the abutment positioning strips tend to move towards the central axis of the circular support base. In practice, the positioning abutment strips are first moved sequentially away from the circular support base and positioned at a preset position. Then, the workpiece is placed at the center of the top wall of the circular support base, and the positioning abutment strips are then sequentially made to abut against the workpiece, thereby positioning the workpiece on the circular support base by abutment.

[0004] In the process of developing this application, it was found that the above-mentioned technology has at least the following problems: During the process of positioning the workpiece, before the worker places the workpiece in front of the circular support base, it is necessary to move each abutting positioning strip in sequence away from the central axis of the circular support base. After placing the workpiece in the circular support base, it is necessary to move each abutting positioning strip in sequence to abut the workpiece in order to achieve the positioning of the workpiece. It can be seen that the efficiency of positioning the workpiece at the preset detection position of the three-axis coordinate measuring machine by the existing technology is low. Summary of the Invention

[0005] To improve the efficiency of positioning workpieces at preset detection positions on a three-axis coordinate measuring machine, this application provides a workpiece base for a three-axis coordinate measuring machine.

[0006] The technical solution provided in this application for a workpiece base for a three-axis coordinate measuring machine is as follows:

[0007] A workpiece base for a three-axis coordinate measuring machine includes a positioning base with a positioning blind hole, a top positioning cavity and a mounting cavity communicating with the positioning blind hole, a connecting block in the top positioning cavity, a contact component slidably connected to the connecting block for extending into the positioning blind hole, a first elastic element connecting the connecting block and the contact component, an electromagnetic drive component shared by the top positioning cavity and the mounting cavity for driving the contact component, a mounting blind hole in the positioning blind hole, a first proximity sensor in the mounting blind hole, a logic controller connected to the first proximity sensor, and the logic controller connected to the electromagnetic drive component.

[0008] By adopting the above technical solution, in the initial state, the logic controller controls the electromagnetic drive component to magnetically abut the component so that the abutment component is only in the top positioning cavity. At this time, the first elastic element is in a compressed state, and a part of the workpiece is inserted into the positioning blind hole to achieve circumferential positioning of the workpiece. When the bottom end of the workpiece is inserted into the preset position at the bottom of the positioning blind hole, the first proximity sensor can sense the workpiece and generate a first induced electrical signal, which is sent to the logic controller. Then, the logic controller controls the electromagnetic drive component to stop the magnetic abutment component according to the first induced electrical signal. In this way, the abutment component is inserted into the positioning blind hole under the elastic action of the first elastic element and tightly abuts against the workpiece, thus achieving axial positioning of the workpiece. By performing circumferential positioning and circumferential positioning of the workpiece, the overall positioning of the workpiece can be achieved. The operator only needs to put a part of the workpiece into the positioning blind hole. It can be seen that the workpiece base for the three-axis coordinate measuring machine disclosed in this application can improve the efficiency of positioning the workpiece at the preset detection position of the three-axis coordinate measuring machine.

[0009] In one specific implementation, the electromagnetic drive assembly includes an electromagnetic controller connected to the logic controller, the electromagnetic controller being disposed in the mounting cavity, and the electromagnetic controller being connected to an electromagnetic block disposed in the top positioning cavity; a magnet cooperating with the electromagnetic block is connected to the abutment assembly.

[0010] By adopting the above technical solution, when it is necessary to control the abutting component to extend into the positioning blind hole to abut and position the workpiece, the electromagnetic controller controls the electromagnetic block to temporarily lose its magnetism. In this way, the electromagnetic block does not attract the magnet, and under the action of the elastic force of the first elastic element, the abutting component extends into the positioning blind hole to abut and abut against the workpiece, thereby realizing the axial positioning of the workpiece.

[0011] In one specific implementation, the abutting component is provided with a slot; a hook is rotatably connected in the mounting cavity, and a second elastic element is connected between the hook and the cavity wall of the mounting cavity; a linear module is provided in the mounting cavity, and an abutting end is connected to the linear module for abutting with the hook.

[0012] By adopting the above technical solution, when the abutting component is fully located in the top positioning cavity, under the elastic action of the second elastic element, the hook of the hook extends into the slot of the abutting component, thereby locking the abutting component. This facilitates the prevention of the abutting component extending into the positioning blind hole due to circuit failure of the electromagnetic drive component when it is not necessary to extend the abutting component into the positioning blind hole, thus improving the stability of the state when the abutting component is fully located in the top positioning cavity. In addition, after the workpiece is extended into the positioning blind hole, the logic controller automatically controls the linear module to drive the abutting end to move. During the movement, the abutting end presses against the hook until the hook disengages from the slot. At this time, the hook no longer restricts the abutting component. Then, the logic controller also controls the electromagnetic drive component to stop magnetically attracting the abutting component. Then, the abutting component extends into the positioning blind hole and abuts against the workpiece under the elastic force of the first elastic element.

[0013] In one specific implementation, the positioning base has an annular cavity and a plurality of ball channels connecting the annular cavity and the positioning blind hole, and the ball channels are provided with balls; a plurality of lead screws extending into the annular cavity are rotatably connected to the positioning base; the positioning base also has a bottom annular cavity, and a motor connected to the lead screw is provided in the bottom annular cavity; an abutment ring block is threadedly connected to the lead screw and slidably connected in the annular cavity; the abutment ring block is provided with a clearance groove for the balls to enter.

[0014] By adopting the above technical solution, when the first proximity sensor detects that the workpiece has entered the preset position of the positioning blind hole, it generates a first induced electrical signal and transmits the first induced electrical signal to the logic controller. The logic control component controls the electromagnetic drive component and the linear module according to the first induced electrical signal, thereby realizing the first-level positioning of the workpiece in the axial direction. It also controls the motor to drive the lead screw according to the first induced electrical signal, thereby driving the abutment ring block to move. During the movement, the abutment ring block pushes the ball from the relief groove into the ball channel, so that a part of the ball extends into the positioning blind hole and abuts against the workpiece. In this way, the second-level positioning of the workpiece in the axial direction can be realized, which facilitates further improvement of the effect of abutting and positioning the workpiece in the axial direction of the positioning blind hole.

[0015] In one specific implementation, the lead screw is connected to a driven gear, a plurality of driven gears are connected to a chain, and the motor is connected to a driving gear that meshes with the chain.

[0016] By adopting the above technical solution, the logic controller controls the motor to drive the drive gear, the drive gear drives the chain, and the chain synchronously drives several driven gears. Since the driven gears are connected to the corresponding lead screws, this component can achieve the effect of a single motor driving multiple lead screws at the same time, thereby reducing the number of motors used. Moreover, it can make several lead screws rotate synchronously at the same speed, which facilitates the synchronous driving of the abutment ring block by several lead screws. This not only provides sufficient power support for the movement of the abutment ring block, but also improves the movement stability of the abutment ring block.

[0017] In one specific implementation scheme, the positioning base has a circumferential air passage, which is connected to a preset inflation structure. The inflation structure is connected to the logic controller. The positioning base has a radial air passage that is connected to the circumferential air passage. A first magnetic block is slidably connected in the radial air passage. The positioning base also has a radial groove, in which a second magnetic block that cooperates with the first magnetic block is slidably connected. The second magnetic block is connected to an abutment.

[0018] By adopting the above technical solution, when the abutting component achieves the first-level abutting positioning of the workpiece in the axial direction, the logic controller also controls the inflation structure to inject high-pressure air into the circumferential air passage according to the first induced electrical signal. The high-pressure air further flows from the circumferential air passage to the radial air passage and pushes the first magnetic block in the radial air passage to move towards the positioning blind hole. While the first magnetic block moves, it drives the second magnetic block to move. The second magnetic block simultaneously drives the abutting joint to move towards the workpiece until the abutting joint abuts against the workpiece. In this way, while the abutting component achieves the first-level abutting positioning effect of the workpiece in the axial direction of the positioning blind hole, the abutting joint also abuts against the workpiece, which can achieve the third-level abutting positioning of the workpiece in the axial direction of the positioning blind hole, thereby further improving the abutting positioning effect of the workpiece.

[0019] In one specific implementation scheme, a third elastic element is connected between the end of the first magnetic block away from the circumferential air passage and the positioning base; an electronic vent valve connected to a logic controller is provided between the inflation structure and the circumferential air passage.

[0020] By adopting the above technical solution, after the workpiece is measured by the three-axis coordinate measuring machine, the logic controller controls the inflation structure to stop working and opens the electronic vent valve. The electronic vent valve releases the high-pressure air in the radial air passage. At this time, the high-pressure air no longer presses against the first magnetic block in the direction of the positioning blind hole. The third elastic element moves the first magnetic block away from the positioning blind hole. In this way, the contact joint also moves synchronously with the first magnetic block, so that it no longer contacts the workpiece. In addition, the third elastic element can also prevent the first magnetic block from moving too fast in the direction of the positioning blind hole when high-pressure air is suddenly filled into the radial air passage, so as to avoid violently colliding with the positioning base and damaging the first magnetic block.

[0021] In one specific implementation scheme, a rubber pad is connected to one end of the abutment near the positioning blind hole, and the top sidewall of the rubber pad near the positioning blind hole is an arc-shaped sidewall; a funnel-shaped hole communicating with the top of the positioning blind hole is provided on the positioning base.

[0022] By adopting the above technical solution, the rubber pad can act as a buffer when the abutment and the workpiece come into contact, thus protecting both the abutment and the workpiece; designing part of the side wall of the rubber pad as an arc-shaped side wall helps to prevent the abutment from getting stuck in the workpiece inserted into the positioning blind hole; designing a funnel-shaped hole at the top of the positioning blind hole improves the convenience for workers to insert the workpiece into the positioning blind hole.

[0023] In one specific implementation, the bottom of the mounting blind hole is provided with a mounting blind hole, and a second proximity sensor connected to the logic controller is provided in the mounting blind hole. The sensing distance of the second proximity sensor is greater than the sensing distance of the first proximity sensor, and the logic controller is connected to an alarm.

[0024] By adopting the above technical solution, when the second proximity sensor detects the workpiece but the first proximity sensor does not, the logic controller controls the alarm to issue an alarm signal based on the detection results of the first and second proximity sensors, thereby informing the staff that there may be foreign objects in the positioning blind hole, which may cause the workpiece to fail to move to the preset position, so that the staff can deal with the abnormal situation in a timely manner.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. Facilitates improving the efficiency of positioning the workpiece at the preset detection position on the three-axis coordinate measuring machine;

[0027] 2. Facilitates improved workpiece positioning;

[0028] 3. Facilitates the insertion of workpieces into the workpiece base of a three-axis coordinate measuring machine. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the overall structure of a workpiece base for a three-axis coordinate measuring machine according to an embodiment of this application.

[0030] Figure 2 is a cross-sectional view in an embodiment of this application used to illustrate the positional relationship between the primary abutment positioning structure, the secondary abutment positioning structure and the tertiary abutment positioning structure.

[0031] Figure 3 is an enlarged view of part A in Figure 2.

[0032] Figure 4 is a schematic diagram of the workpiece structure in an embodiment of this application.

[0033] Figure 5 is a cross-sectional view in an embodiment of this application used to illustrate the positional relationship between the primary abutment positioning structure, the secondary abutment positioning structure and the tertiary abutment positioning structure.

[0034] Figure 6 is an enlarged view of part B in Figure 5.

[0035] Figure 7 is an enlarged view of part C in Figure 5.

[0036] Figure 8 is an enlarged view of part D in Figure 5.

[0037] Explanation of reference numerals in the attached drawings: 1. Base plate; 2. Support column; 3. Positioning base; 31. Positioning blind hole; 32. Mounting blind hole; 33. Top positioning cavity; 34. Mounting cavity; 35. Connecting hole; 36. Circumferential cavity; 37. Bottom annular cavity; 38. Ball bearing channel; 39. Circumferential air passage; 310. Radial air passage; 311. Radial groove; 312. Funnel-shaped hole; 4. Position detection structure; 41. First proximity sensor; 42. Second proximity sensor; 43. Logic controller; 44. Alarm; 5. First-level abutment positioning structure; 51. Connecting block; 511. Block hole; 52. Abutment assembly; 521. Guide rod; 522. Sliding block; 5221. Slot; 523. First elastic element; 524. Rubber head; 53. Snap-fit ​​assembly; 531. Snap-fit. 532. Hook; 533. Second elastic element; 534. Linear module; 535. Abutment end; 54. Electromagnetic drive assembly; 546. Electromagnetic controller; 547. Electromagnetic block; 548. Magnet; 6. Secondary abutment positioning structure; 61. Longitudinal limit rod; 62. Abutment ring block; 621. Relief groove; 63. Ball bearing; 64. Bearing; 65. Lead screw; 66. Driven gear; 67. Chain; 68. Motor; 69. Drive gear; 7. Tertiary abutment positioning structure; 71. First magnetic block; 72. Third elastic element; 73. Vent pipe; 74. Electronic vent valve; 75. Second magnetic block; 76. Abutment joint; 77. Rubber pad; 8. Workpiece to be tested; 81. Workpiece body; 82. Positioning pin; 821. First concave annular groove; 822. Second concave annular groove. Detailed Implementation

[0038] The present application will be further described in detail below with reference to Figures 1-8.

[0039] This application discloses a workpiece base for a three-axis coordinate measuring machine. Referring to Figure 1, the workpiece base for the three-axis coordinate measuring machine includes a base plate 1 for positioning on the measuring platform of the three-axis coordinate measuring machine by bolts. A support column 2 is fixed on the top wall of the base plate 1. A disc-shaped positioning base 3 is connected to the top of the support column 2. Referring to Figure 2, a positioning detection structure 4 is connected to both the positioning base 3 and the support column 2. The positioning detection structure 4 is used to detect whether the workpiece is placed in a preset position on the positioning base 3. The positioning base 3 is provided with a primary abutment positioning structure 5, a secondary abutment positioning structure 6, and a tertiary abutment positioning structure 7 along its axial direction for abutting and positioning the workpiece. The primary abutment positioning structure 5, the secondary abutment positioning structure 6, and the tertiary abutment positioning structure 7 are all electrically connected to the positioning detection structure 4.

[0040] In practice, the operator places the workpiece to be measured onto the positioning base 3. After placement, the positioning detection structure 4 detects the workpiece to determine whether it is placed in the preset position on the positioning base 3. If so, the positioning detection structure 4 continues to control the first-level abutment positioning structure 5, the second-level abutment positioning structure 6, and the third-level abutment positioning structure 7 to abut and position the workpiece. During the positioning process, the operator only needs to place the workpiece on the positioning base 3. Subsequently, the positioning detection structure 4 controls the first-level abutment positioning structure 5, the second-level abutment positioning structure 6, and the third-level abutment positioning structure 7 to abut and position the workpiece on the positioning base 3. Compared with the existing technology, this greatly improves the efficiency of positioning the workpiece in the preset detection position of the three-axis coordinate measuring machine.

[0041] Specifically, referring to Figures 2 and 3, a positioning blind hole 31 is coaxially formed on the positioning base 3, and a mounting blind hole 32 is coaxially formed on the bottom wall of the positioning blind hole 31; the positioning detection structure 4 includes a first proximity sensor 41 and a second proximity sensor 42 fixed on the bottom wall of the mounting blind hole 32; referring to Figure 2, a logic controller 43 is provided in the support column 2, which is electrically connected to both the first proximity sensor 41 and the second proximity sensor 42, and the logic controller 43 is electrically connected to an alarm 44 fixed on the side wall of the support column 2; it should be noted that the sensing direction of the first proximity sensor 41 and the second proximity sensor 42 is upward, the edge of the sensing range of the first proximity sensor 41 is located at the bottom wall of the positioning blind hole 31, the sensing distance of the second proximity sensor 42 is greater than the sensing distance of the first proximity sensor 41, and the edge of the sensing range of the second proximity sensor 42 is between the bottom and the top of the positioning blind hole 31.

[0042] Referring to Figure 4, the workpiece 8 to be tested includes a workpiece body 81. A cylindrical positioning pin 82 is connected to the bottom wall of the workpiece body 81. The diameter of the positioning pin 82 is the same as the inner diameter of the positioning blind hole 31, and the height of the positioning pin 82 is the same as the depth of the positioning blind hole 31. A first concave annular groove 821 and a second concave annular groove 822, which are coaxial with the positioning pin 82, are provided on the side wall of the positioning pin 82. The first concave annular groove 821 is located near the top of the positioning pin 82, and the second concave annular groove 822 is located near the bottom of the positioning pin 82.

[0043] During implementation, the staff inserts the positioning pin 82 into the positioning blind hole 31. When the bottom of the positioning blind hole 31 of the bottom wall of the positioning pin 82 contacts the bottom, the first proximity sensor 41 can just sense the positioning pin 82 and generate the first induced electrical signal. Then the first induced electrical signal is sent to the logic controller 43. At this time, the logic controller 43 determines that the workpiece has been placed in the preset position of the positioning base 3. Then the logic controller 43 starts to control the first-level abutment positioning structure 5, the second-level abutment positioning structure 6, and the third-level abutment positioning structure 7 to abut and position the workpiece 8 to be tested.

[0044] It should be noted that before measuring the workpiece 8, foreign objects such as part fragments may fall into the positioning blind hole 31. If foreign objects are present in the positioning blind hole 31, even if the operator inserts the positioning pin 82 of the workpiece 8 into the positioning blind hole 31, the bottom wall of the positioning pin 82 will not contact the bottom wall of the positioning blind hole 31. If the workpiece 8 is then positioned by contact, the measurement result will be significantly deviated because the workpiece 8 is not positioned in the preset position, resulting in measurement failure.

[0045] In practice, to facilitate determining whether the bottom wall of the locating pin 82 is in contact with the bottom wall of the locating blind hole 31, the determination process is as follows:

[0046] After the worker inserts the positioning pin 82 of the workpiece into the positioning blind hole 31, if the bottom wall of the positioning pin 82 contacts the bottom wall of the positioning blind hole 31, both the first proximity sensor 41 and the second proximity sensor 42 can sense the positioning pin 82. The first proximity sensor 41 generates a corresponding first induced electrical signal and then sends the first induced electrical signal to the logic controller 43. The second proximity sensor 42 generates a corresponding second induced electrical signal and then sends the second induced electrical signal to the logic controller 43. After receiving the first induced electrical signal and the second induced electrical signal, the logic controller 43 determines that the bottom wall of the positioning pin 82 is in contact with the bottom wall of the positioning blind hole 31, that is, the workpiece 8 to be tested is placed in the preset positioning position.

[0047] After the worker inserts the positioning pin 82 of the workpiece into the positioning blind hole 31, if the bottom wall of the positioning pin 82 does not contact the bottom wall of the positioning blind hole 31, then only the second proximity sensor 42 can sense the positioning pin 82, while the first proximity sensor 41 cannot sense the positioning pin 82. After sensing the positioning pin 82, the second proximity sensor 42 generates a corresponding second induced electrical signal and sends the second induced electrical signal to the logic controller 43. The logic controller 43 starts timing after receiving the second induced electrical signal. If the logic controller 43 determines that it has not received the first induced electrical signal sent by the first proximity sensor 41 within the preset time interval, then the logic controller 43 determines that a foreign object has entered the positioning blind hole 31, causing the positioning workpiece to not be placed in the preset measurement position. At this time, the logic controller 43 controls the alarm 44 to send an alarm message to the worker so that the worker can deal with this abnormal situation in a timely manner.

[0048] Referring to Figures 5 and 6, the positioning base 3 has top positioning cavities 33 along different radial directions. Several top positioning cavities 33 are evenly distributed around the positioning blind holes 31, and the top positioning cavities 33 are connected to the positioning blind holes 31. The positioning base 3 also has mounting cavities 34 that correspond one-to-one with the top positioning cavities 33 along different radial directions. The mounting cavities 34 are located directly below the corresponding top positioning cavities 33 and are parallel to the corresponding top positioning cavities 33 in length. In addition, the positioning base 3 has connecting holes 35 that connect the mounting cavities 34 and the corresponding top positioning cavities 33.

[0049] The primary abutment positioning structure 5 includes a connecting block 51 fixed in the top positioning cavity 33. The connecting block 51 has a block hole 511 with its axial direction parallel to the length direction of the top positioning cavity 33. The connecting block 51 is slidably connected to an abutment component 52 through the block hole 511. Specifically, the abutment component 52 includes a guide rod 521 that passes through the block hole 511 and is slidably connected to the connecting block 51. A sliding block 522 is connected to one end of the guide rod 521 near the positioning blind hole 31. A first elastic element 523 is sleeved on the guide rod 521. In this embodiment, the first elastic element 523 is specifically a spring. One end of the spring abuts against the connecting block 51, and the other end abuts against the sliding block 522. The sliding block 522 is slidably connected to the cavity wall of the top positioning cavity 33. A rubber head 524 for extending into the first concave annular groove 821 and abutting against the positioning pin 82 is connected to one end of the sliding block 522 away from the guide rod 521.

[0050] A slot 5221 is provided on the bottom wall of the sliding block 522. The mounting cavity 34 is also provided with a locking component 53 for locking into the slot 5221 to achieve locking and positioning of the abutment component 52. Specifically, the locking component 53 includes a hook 531 rotatably connected to the cavity wall of the mounting cavity 34. The hook part of the hook 531 is used to pass through the connecting hole 35 and extend into the slot 5221 to abut against the sliding block 522. Here, the end of the hook 531 away from its hook part is referred to as the driving end. A second elastic element 532 is connected between the driving end of the hook 531 and the cavity wall of the mounting cavity 34 on which it is placed. In this example, the second elastic element 532 is a spring. A linear module 533 electrically connected to the logic controller 43 is fixed on the bottom cavity wall of the mounting cavity 34. The sliding direction of the slider of the linear module 533 is parallel to the length direction of the mounting cavity 34. An abutment end 534 for abutting the drive end of the hook 531 is fixed on the top wall of the slider of the linear module 533.

[0051] The top positioning cavity 33 and the mounting cavity 34 are both provided with an electromagnetic drive assembly 54 for driving the abutment assembly 52 to slide in the top positioning cavity 33; specifically, the electromagnetic drive assembly 54 includes an electromagnetic controller 541 disposed at the end of the mounting cavity 34 away from the positioning blind hole 31, and the electromagnetic controller 541 is electrically connected to the logic controller 43; an electromagnetic block 542 electrically connected to the electromagnetic controller 541 is fixed at the end of the positioning cavity away from the positioning blind hole 31, and a magnet 543 that works in conjunction with the electromagnetic block 542 is fixed at the end of the guide rod 521 near the electromagnetic block 542.

[0052] In the initial state, the logic controller 43 controls the electromagnetic controller 541 to supply power to the electromagnetic block 542, thereby making the electromagnetic block 542 and the magnet 543 in a strong magnetic attraction state. At this time, the first elastic member 523 is in a compressed state, and the slot of the slot 5221 is aligned with the connecting hole 35 located below it. At this time, the second elastic member 532 is in a relaxed state, thereby driving the driving end of the hook 531, and thus making the hook part of the hook 531 in a state of being engaged in the slot 5221. At this time, the hook 531 positions the sliding block 522 in the top positioning cavity 33 in a snap-fit ​​manner, and the abutting end 534 does not contact the driving end and is located between the driving end and the positioning blind hole 31.

[0053] In implementation, when the logic controller 43 determines that the workpiece has been placed in the preset measurement position, the logic controller 43 first controls the electromagnetic controller 541 to stop supplying power to the electromagnetic block 542, thereby stopping the electromagnetic block 542 from magnetically attracting the magnet 543; then the logic controller 43 also controls the linear module 533 to drive the abutment end 534 to abut the driving end of the hook 531 until the hook part of the hook 531 disengages from the sliding block 522. It should be noted that when the workpiece 8 to be measured is placed in the preset measurement position, that is, when the bottom wall of the positioning pin 82 of the workpiece 8 to be measured is in contact with the bottom wall of the positioning blind hole 31, at this time, the end of the top positioning cavity 33 that connects to the positioning blind hole 31 is directly opposite the first concave annular groove 821. When the hook of the latch 531 disengages from the sliding block 522, neither the electromagnetic block 542 nor the latch 531 positions the sliding block 522. At this time, under the elastic force of the first elastic element 523, the sliding block 522 moves toward the first concave annular groove 821 until the rubber head 524 extends into the first concave annular groove 821 and tightly abuts against the groove wall of the first concave annular groove 821. The rubber head 524 also has a certain degree of softness, which can play a certain buffering role while abutting against the positioning pin 82, thereby preventing violent collisions between the sliding block 522 and the positioning pin 82, and thus protecting both the sliding block 522 and the positioning pin 82. In summary, the first-level abutment positioning structure 5 can realize the first-level abutment positioning of the workpiece.

[0054] Referring to Figure 7, the positioning base 3 also has an annular cavity 36 surrounding the positioning blind hole 31, and the annular cavity 36 is located below the mounting cavity 34; the positioning base 3 also has a bottom annular cavity 37 located below the annular cavity 36; the positioning base 3 has a plurality of ball channels 38 that connect the annular cavity 36 and the positioning blind hole 31, and the plurality of ball channels 38 are evenly distributed around the positioning blind hole 31.

[0055] The secondary abutment positioning structure 6 includes several longitudinal limiting rods 61 disposed between the top cavity wall and the bottom wall of the annular cavity 36. The axial direction of the longitudinal limiting rods 61 is parallel to the axial direction of the positioning blind hole 31, and the longitudinal limiting rods 61 are evenly distributed around the positioning blind hole 31. The several longitudinal limiting rods 61 are slidably connected to an abutment ring block 62. A ball 63 is provided in the ball channel 38, and a clearance groove 621 for the ball 63 to enter is opened on the side wall of the abutment ring block 62 near the ball channel 38. Several shafts are provided on the positioning base 3 between the bottom annular cavity 37 and the annular cavity 36. The outer ring of bearing 64 is connected to positioning base 3. A lead screw 65 is coaxially connected to the inner ring of bearing 64. The axial direction of the lead screw is parallel to the axial direction of the longitudinal limiting rod 61. The lead screw passes through the abutment ring block 62 and is threadedly connected to the abutment ring block 62. The bottom end of the lead screw extends into the bottom ring cavity 37. A driven gear 66 is coaxially connected to the bottom end of the lead screw. Several driven gears 66 are connected to a chain 67. A motor 68 electrically connected to the logic controller 43 is fixed on the bottom wall of the bottom ring cavity 37. A drive gear 69 that meshes with the chain 67 is coaxially connected to the output shaft of the motor 68.

[0056] It should be noted that when the bottom wall of the locating pin 82 contacts the bottom wall of the locating blind hole 31, the ball channel 38 is precisely aligned with the second concave annular groove 822 on the locating pin 82. In the initial state, the ball 63 is simultaneously in the ball channel 38 and the clearance groove 621, and has not extended into the locating blind hole 31.

[0057] In implementation, when the logic controller 43 controls the primary abutment positioning structure 5 to abut and position the workpiece in the form of abutting the first concave annular groove 821 on the positioning pin 82, the logic controller 43 also starts the motor 68, which drives the drive gear 69 to drive the chain 67, and then drives several driven gears 66 through the chain 67, which in turn drives several lead screws 65 synchronously. As the lead screws 65 rotate, they drive the abutment ring block 62 to move downward. During this process, the abutment ring block 62 gradually squeezes the ball 63 into the ball channel 38 until the ball 63 extends out from the end of the ball channel 38 away from the annular cavity 36 and extends into the second concave annular groove 822, where it tightly abuts against the groove wall. In summary, the secondary abutment positioning structure 6 can achieve secondary abutment positioning of the workpiece, and the secondary abutment positioning structure 6 can work in conjunction with the primary abutment positioning structure 5 to further improve the positioning effect of the workpiece.

[0058] Referring to Figure 8, the positioning base 3 has a circumferential air passage 39 coaxially arranged with the positioning blind hole 31. The circumferential air passage 39 is located above the top positioning cavity 33. The positioning base 3 also has a plurality of radial air passages 310 communicating with the circumferential air passages 39. The radial air passages 310 are arranged radially along the positioning base 3, and the plurality of radial air passages 310 are evenly arranged around the positioning blind hole 31. The top wall of the positioning base 3 also has a plurality of radial grooves 311 corresponding to the radial air passages 310. The length direction of the radial grooves 311 is parallel to the length direction of the corresponding radial air passages 310, and the cross-section of the radial grooves 311 is inverted T-shaped.

[0059] The three-stage contact positioning structure 7 includes a first magnetic block 71 slidably connected in the radial air passage 310. A third elastic element 72 is connected between the first magnetic block 71 and the side wall of the radial air passage 310 away from the circumferential air passage 39. In this embodiment, the third elastic element 72 is a spring. A vent pipe 73 communicating with the circumferential air passage 39 is connected to the positioning base 3. An electronic vent valve 74 electrically connected to the logic controller 43 is provided on the vent pipe 73. A preset inflation structure (not shown in the figure) is connected to the end of the vent pipe 73 away from the circumferential air passage 39. The inflation structure is electrically connected to the logic controller 43. A second magnetic block 75, also inverted T-shaped, is slidably connected in the radial groove 311. The second magnetic block 75 and the first magnetic block 71 are magnetically attracted to each other. The top of the second magnetic block 75 is fixed with an abutment 76. The end of the abutment 76 near the positioning blind hole 31 is fixed with a rubber pad 77 for abutting against the workpiece. It should be noted that the top of the side wall of the rubber pad 77 near the positioning blind hole 31 is an arc-shaped side wall, which makes it easy to enter the area between several rubber pads 77 even when the workpiece 8 to be tested is too large. In addition, in order to facilitate the operator to insert the positioning pin 82 of the workpiece 8 to be tested into the positioning blind hole 31, referring back to Figure 2, the positioning base 3 is provided with a funnel-shaped hole 312 that is coaxial with and connected to the mounting blind hole 32 at the top position of the mounting blind hole 32.

[0060] In the initial state, the inflation structure is in a stopped state, and the third elastic element 72 is in a stretched state. At this time, the first magnetic block 71, the second magnetic block 75, and the abutment 76 are all far away from the positioning blind hole 31.

[0061] In practice, when the logic controller 43 controls the first-level abutment positioning structure 5 and the second-level abutment positioning structure 6 to abut and position the workpiece, the logic controller 43 also activates the inflation structure to inject high-pressure air into the circumferential air passage 39 and the radial air passage 310. Under the compression of the high-pressure air, the first magnetic block 71 moves towards the position close to the positioning blind hole 31, gradually compressing the third elastic element 72. At the same time, it also drives the second magnetic block 75 to move towards the position close to the positioning blind hole 31 until the rubber pad 77 is tightly abutted against the workpiece 8 and no longer moves. In summary, the three-level abutment positioning structure 7 can realize the three-level abutment positioning of the workpiece. The three-level abutment positioning structure 7 can work in conjunction with the first-level abutment positioning structure 5 and the second-level abutment positioning structure 6 to further improve the positioning effect of the workpiece.

[0062] After the abutment positioning structure of the workpiece 8 to be measured is realized by the first-level abutment positioning structure 5, the second-level abutment positioning structure 6 and the third-level abutment positioning structure 7, the staff begins to operate the three-axis coordinate measuring machine to measure the workpiece 8 to be measured.

[0063] It should be noted that the logic controller 43 is also connected to a preset host computer (not shown in the figure).

[0064] After the measurement work is completed:

[0065] Referring to Figure 6, a reset command is sent from the host computer to the logic controller 43. The logic controller, based on the control quality, controls the electromagnetic controller 541 to supply power to the electromagnetic block 542, causing the electromagnetic block 542 to generate a strong magnetic force attracting the magnet 543. Under the action of this strong magnetic force, the magnet 543 drives the entire abutment assembly 52 to retract into the top positioning cavity 33. Thus, the rubber head 524 no longer functions as an abutment and positioning element for the first concave annular groove 821. After the abutment assembly 52 retracts to the preset position, the slot 5221 is now aligned with the connecting hole 35. The logic controller 43 also controls the linear module 533 to reset the abutment end 534. At this time, under the elastic force of the second elastic element 532, the driving end of the hook 531 is driven, causing the hook portion of the hook 531 to pass through the connecting hole 35 and enter the slot 5221 to abut against the sliding block 522.

[0066] Referring to Figure 7, the logic controller 43 also controls the motor 68 to reverse its output shaft according to the reset command, so that the abutment ring block 62 moves upward until the clearance groove 621 is opposite to the ball channel 38. At this time, the ball 63 moves into the clearance groove 621 and no longer engages with the second concave ring groove 822 on the positioning pin 82.

[0067] Referring to Figure 8, the logic controller 43 also controls the inflation structure to stop according to the reset command, and controls the electronic vent valve 74 to be in the venting state, thereby releasing the high-pressure air in the axial air passage and the radial air passage 310; at this time, the high-pressure air no longer compresses the first magnetic block 71, and the first magnetic block 71 moves away from the positioning blind hole 31 under the elastic force of the third elastic element 72. The first magnetic block 71 simultaneously drives the second magnetic block 75 and the abutment 76 to move synchronously, thereby causing the first rubber pad 77 to disengage from the workpiece.

[0068] The above reset steps prevent the workpiece base of the three-axis coordinate measuring machine from abutting and positioning the workpiece. Then, the operator can remove the measured workpiece from the workpiece base of the three-axis coordinate measuring machine and proceed with the abutting, positioning, and measurement of the next workpiece 8 to be measured.

[0069] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A workpiece base for a triaxial coordinate measuring machine, characterized in that: The system includes a positioning base (3), on which a positioning blind hole (31) is provided, a top positioning cavity (33) and a mounting cavity (34) communicating with the positioning blind hole (31), a connecting block (51) provided in the top positioning cavity (33), the connecting block (51) being slidably connected to an abutting component (52) for extending into the positioning blind hole (31), a first elastic element (523) connecting the connecting block (51) and the abutting component (52), and an electromagnetic drive component (54) jointly provided in the top positioning cavity (33) and the mounting cavity (34), the electromagnetic drive component (54) being used to drive the abutting component (52); the positioning blind hole (31) has a blind mounting hole (32), in which a first proximity sensor (41) is provided. The first proximity sensor (41) is connected to a logic controller (43), which is connected to the electromagnetic drive assembly (54). The abutment assembly (52) has a slot (5221). A hook (531) is rotatably connected to the mounting cavity (34), and a second elastic element (532) is connected between the hook (531) and the cavity wall of the mounting cavity (34). A linear module (533) is provided in the mounting cavity (34), and a component for abutting against the hook (531) is connected to the linear module (533). The positioning base (3) has an abutment end (534); a circular cavity (36) is provided in the positioning base (3), and a plurality of ball channels (38) connecting the circular cavity (36) and the positioning blind hole (31) are provided in the ball channels (38), and a ball (63) is provided in the ball channels (38); a plurality of lead screws (65) extending into the circular cavity (36) are rotatably connected in the positioning base (3), and a bottom annular cavity (37) is also provided in the positioning base (3), and a motor (68) connected to the lead screw is provided in the bottom annular cavity (37), and an abutment ring block (62) slidably connected in the circular cavity (36) is threaded on the lead screw (65); the abutment ring block (62) is provided with a ball (63) for the ball (63) to be inserted into the positioning blind hole (31); 3) Entering the clearance groove (621); the positioning base (3) is provided with a circumferential air passage (39), the circumferential air passage (39) is connected to a preset inflation structure, the inflation structure is connected to the logic controller (43), the positioning base (3) is provided with a radial air passage (310) connected to the circumferential air passage (39), a first magnetic block (71) is slidably connected in the radial air passage (310), the positioning base (3) is also provided with a radial groove (311), a second magnetic block (75) that cooperates with the first magnetic block (71) is slidably connected in the radial groove (311), and the second magnetic block (75) is connected to an abutment (76).

2. The workpiece base for a triaxial coordinate measuring machine according to claim 1, characterized in that: The electromagnetic drive assembly (54) includes an electromagnetic controller (541) connected to the logic controller (43), the electromagnetic controller (541) being disposed in the mounting cavity (34), and the electromagnetic controller (541) being connected to an electromagnetic block (542) disposed in the top positioning cavity (33); the abutment assembly (52) is connected to a magnet (543) that cooperates with the electromagnetic block (542).

3. The workpiece base for a triaxial coordinate measuring machine according to claim 1, characterized in that: The lead screw is connected to a driven gear (66), and a plurality of driven gears (66) are connected to a chain (67). The motor (68) is connected to a driving gear (69) that meshes with the chain (67).

4. The workpiece base for a triaxial coordinate measuring machine according to claim 1, characterized in that: The end of the first magnetic block (71) away from the circumferential air passage (39) is connected to the positioning base (3) by a third elastic element (72); an electronic vent valve (74) connected to the logic controller (43) is provided between the inflation structure and the circumferential air passage (39).

5. The workpiece base for a triaxial coordinate measuring machine according to claim 1, characterized in that: The abutment (76) is connected to a rubber pad (77) at one end near the positioning blind hole (31). The top sidewall of the rubber pad (77) near the positioning blind hole (31) is an arc-shaped sidewall. The positioning base (3) is provided with a funnel-shaped hole (312) that communicates with the top of the positioning blind hole (31).

6. The workpiece base for a triaxial coordinate measuring machine according to claim 1, characterized in that: The bottom of the positioning blind hole (31) is provided with a mounting blind hole (32), and a second proximity sensor (42) connected to the logic controller (43) is provided in the mounting blind hole (32). The sensing distance of the second proximity sensor (42) is greater than the sensing distance of the first proximity sensor (41). The logic controller (43) is connected to an alarm (44).

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