A Z-axis movement mechanism for three-coordinate measurement

Abstract

The utility model discloses a three -coordinate measurement is with Z axis movement mechanism, including X axle mobile base, and the both ends of X axle mobile base side are integrally fixed with the positioning support, and the top of two positioning supports is vertically fixed with the support plate that is symmetrically arranged, and the top of two support plates is commonly connected with the roof, and the counterweight telescopic guide rod is equipped between two support plates, and the counterweight telescopic guide rod is composed of movable sleeve rod and telescopic inner rod, and the bottom of roof is provided with first perforation for the telescopic inner rod, and the top of telescopic inner rod is equipped with the locating nut after passing through the roof, and the outside of movable sleeve rod is equipped with Z axis movement frame, and the top of Z axis movement frame is fixed with the receiving plate, and movable sleeve rod and receiving plate detachable fixed connection, and one side of Z axis movement frame is equipped with the limit plate, and the limit plate is fixed with the positioning support through the supporting leg and the mounting block, and this mechanism can guarantee Z axis movement stable precision, and is convenient for dismouting maintenance simultaneously, and improves the measurement reliability and the use convenience.

Description

Technical Field

[0001] This utility model relates to the field of coordinate measuring technology, and in particular to a Z-axis motion mechanism for coordinate measuring. Background Technology

[0002] Coordinate measuring machine (CMM) technology is a key technology for high-precision measurement of workpiece geometric parameters, shape errors, and positional accuracy by detecting the coordinate information of the workpiece on the X, Y, and Z axes. It is widely used in fields such as machinery manufacturing and precision machining. Its measurement accuracy highly depends on the stable operation and convenient maintenance of the various moving parts of the measuring equipment. In the Z-axis motion mechanism of CMM equipment, existing structures, in pursuit of initial connection stability, mostly adopt fixed connection methods such as welding, multiple sets of non-standard fasteners, or integrated nesting, rather than standardized detachable designs that balance stability and ease of disassembly. While these fixed connection methods can ensure the stability of the mechanism's initial operation to a certain extent, during long-term use, when the Z-axis motion mechanism experiences component wear or accuracy deviations requiring repair or replacement, the disassembly process requires specialized tools. Furthermore, some connection parts are difficult to disassemble due to their solidified structure. This not only significantly prolongs disassembly and assembly time and increases the difficulty of maintenance operations, but also easily causes accidental damage to surrounding components during disassembly and assembly, and may even compromise the original assembly accuracy of the mechanism, thus affecting the accuracy of subsequent measurement work. This makes it difficult to meet the needs of efficient maintenance and rapid recovery of equipment in actual production.

[0003] Therefore, those skilled in the art have provided a Z-axis motion mechanism for coordinate measuring machines to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a Z-axis motion mechanism for coordinate measuring machines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A Z-axis motion mechanism for coordinate measuring machine includes an X-axis movable base. Positioning brackets are integrally fixed to both ends of the side of the X-axis movable base. Support plates are vertically fixed to the top of the two positioning brackets by screws, and the two support plates are symmetrically arranged. A top plate is connected to the top of the two support plates by screws. A counterweight telescopic guide rod is provided between the two support plates.

[0007] The counterweight telescopic guide rod consists of a movable sleeve rod and a telescopic inner rod. The bottom end of the telescopic inner rod is slidably connected to the inside of the movable sleeve rod. The bottom end of the top plate is provided with a first through hole for the telescopic inner rod to pass through. After the top end of the telescopic inner rod passes through the first through hole and moves through the top plate, a positioning nut is threaded onto the outer wall.

[0008] The movable sleeve is provided with a Z-axis motion frame on the outside. The Z-axis motion frame is a hollow structure with both ends open. The movable sleeve is located in the middle of the inner side of the Z-axis motion frame. A support plate is fixed to the top of the Z-axis motion frame by screws. The top of the movable sleeve passes through the middle of the support plate and is detachably fixed to the support plate.

[0009] A limiting plate is provided on the side of the Z-axis motion frame away from the X-axis moving base. Support legs are fixedly connected to both sides of the limiting plate. An installation block is integrally fixed to the end of the support leg away from the limiting plate. The installation block is fixedly connected to the side of the positioning bracket away from the X-axis moving base by screws.

[0010] Preferably, the top four corners of the Z-axis motion frame are fixed to the receiving plate with screws, and the bottom of the Z-axis motion frame is provided with a probe mounting plate, and the four corners of the probe mounting plate are fixed to the four corners of the bottom of the Z-axis motion frame with screws.

[0011] Preferably, an annular washer is fitted at the top outer side of the telescopic inner rod, and the annular washer is located between the upper surface of the top plate and the positioning nut.

[0012] Preferably, the receiving plate has a second through hole in the middle for the top end of the movable sleeve rod to pass through. After the top end of the movable sleeve rod passes through the second through hole and moves through the receiving plate, a locking nut is threaded onto the outer wall. A limiting ring is also fixedly fitted on the outer side of the movable sleeve rod. The locking nut and the limiting ring are respectively attached to the upper and lower sides of the receiving plate.

[0013] Preferably, the upper and lower ends of the two positioning brackets are fixedly connected to each other, the Z-axis motion frame moves between the two positioning brackets, and at least one air float is provided on the side of the positioning bracket, the connecting rib and the limiting plate near the Z-axis motion frame.

[0014] Preferably, the top of each of the two positioning brackets on the opposite side is provided with a stepped groove, and both sides of the two support plates on the adjacent side are provided with vertical folded edges, and the vertical parts are treated with a smooth transition.

[0015] The bottom end of the inner side of the support plate is attached to the side of the stepped groove, and the two folded edges wrap around both ends of the stepped groove. The bottom end of the side of the support plate is fixed to the side wall of the stepped groove by screws.

[0016] Preferably, a rectangular folded frame is integrally formed at the bottom edge of the top plate, the rectangular folded frame is inserted between two support plates and fixed to the support plates by screws.

[0017] Preferably, a plurality of reinforcing rods are fixedly connected in the vertical direction to the inner side of the two support plates between the folded edges on one side near the X-axis moving base by screws.

[0018] Preferably, the top of the X-axis moving base is fitted with a first U-shaped seat with its opening facing upward by screws, and a toothed active synchronous pulley is rotatably mounted on the inner side of the first U-shaped seat via a shaft. The bottom of the top plate is fixed with a second U-shaped seat with its opening facing downward by screws, and a toothed driven synchronous pulley is rotatably mounted on the inner side of the second U-shaped seat via a shaft. A synchronous toothed belt is installed between the toothed active synchronous pulley and the toothed driven synchronous pulley for transmission.

[0019] One end of the toothed active synchronous pulley is coaxially fixed to a transmission belt pulley, and the top of the X-axis moving base is also provided with a drive motor mounting position. The drive motor is installed through the motor mounting position, so that the output shaft of the drive motor is connected to the transmission belt pulley.

[0020] A connector is fixed to one side of the receiving plate by a screw, and the connector is fixed to the synchronous toothed belt by the screw.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This coordinate measuring machine's Z-axis motion mechanism, through optimized design, combines ease of maintenance with high stability: standardized screw connections are used between core components, along with stepped grooves and rectangular folded frames for auxiliary positioning, simplifying disassembly and assembly. The entire Z-axis frame can be disassembled into independent components, facilitating later inspection and maintenance and avoiding component damage or precision loss caused by inconvenient disassembly and assembly. At the same time, the counterweight telescopic guide rod balances motion inertia, the air float reduces motion resistance and limits frame offset, and the reinforcing rod and symmetrical structure enhance overall rigidity, ensuring smooth and accurate Z-axis motion, avoiding probe positioning errors, guaranteeing measurement accuracy, reducing component wear, and extending equipment lifespan, thus meeting the needs of high-precision and easy-to-maintain applications. Attached Figure Description

[0023] To illustrate the technical solutions in the embodiments of the present invention or the prior art more specifically and intuitively, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the Z-axis motion mechanism for coordinate measuring machine proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the Z-axis motion frame structure proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the mounting structure of the receiving plate proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the counterweight telescopic guide rod structure proposed in this utility model;

[0028] Figure 5 This is a schematic diagram of the limiting plate structure proposed in this utility model;

[0029] Figure 6 This is a schematic diagram of the positioning bracket structure proposed in this utility model;

[0030] Figure 7 This is a schematic diagram of the top plate installation structure proposed in this utility model;

[0031] Figure 8 This is a schematic diagram of the synchronous toothed belt mounting structure proposed in this utility model;

[0032] Figure 9 The present utility model proposes Figure 4 Enlarged structural diagram at point A in the middle.

[0033] In the diagram: 1. X-axis moving base; 2. Positioning bracket; 3. Support plate; 4. Top plate; 5. Counterweight telescopic guide rod; 51. Movable sleeve rod; 52. Telescopic inner rod; 6. Z-axis moving frame; 7. Positioning nut; 8. Support plate; 9. Limiting plate; 10. Support leg; 11. Mounting block; 12. Probe mounting plate; 13. Limiting ring; 14. Locking nut; 15. Connecting rib plate; 16. Stepped groove; 17. Rectangular folded frame; 18. Reinforcing rod; 19. First U-shaped seat; 20. Second U-shaped seat; 21. Transmission pulley; 22. Connecting component. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0035] Reference Figure 1-8 A Z-axis motion mechanism for coordinate measuring machine includes an X-axis moving base 1. Positioning brackets 2 are integrally fixed to both ends of the side of the X-axis moving base 1. Support plates 3 are vertically fixed to the top of the two positioning brackets 2 by screws, and the two support plates 3 are symmetrically arranged. The top of the two support plates 3 are connected to a top plate 4 by screws. A counterweight telescopic guide rod 5 is provided between the two support plates 3.

[0036] The counterweight telescopic guide rod 5 is composed of a movable sleeve rod 51 and a telescopic inner rod 52. The bottom end of the telescopic inner rod 52 is slidably connected to the inner side of the movable sleeve rod 51. The bottom end of the top plate 4 is provided with a first through hole for the telescopic inner rod 52 to pass through. After the top end of the telescopic inner rod 52 passes through the first through hole and moves through the top plate 4, a positioning nut 7 is threaded on the outer wall.

[0037] The movable sleeve 51 is provided with a Z-axis motion frame 6 on the outside. The Z-axis motion frame 6 is a hollow structure with both ends through. The movable sleeve 51 is located in the middle of the inner side of the Z-axis motion frame 6. The top of the Z-axis motion frame 6 is fixed to the support plate 8 by screws. The top of the movable sleeve 51 passes through the middle of the support plate 8 and is detachably fixed to the support plate 8.

[0038] A limiting plate 9 is provided on the side of the Z-axis motion frame 6 away from the X-axis moving base 1. Support legs 10 are fixedly connected to both sides of the limiting plate 9. An installation block 11 is integrally fixed to the end of the support leg 10 away from the limiting plate 9. The installation block 11 is fixedly connected to the side of the positioning bracket 2 away from the X-axis moving base 1 by screws.

[0039] Using the above technical solution, the X-axis moving base 1 provides a stable installation reference. Its integrally fixed positioning bracket 2, together with the symmetrically arranged support plate 3 and top plate 4, constitute a frame-type support structure, ensuring the rigidity and stability of the overall structure. The counterweight telescopic guide rod 5 consists of a movable sleeve rod 51 and a telescopic inner rod 52. With the first through hole of the top plate 4 and the positioning nut 7, the position of the counterweight can be flexibly adjusted to balance the weight of the mechanism and reduce the inertial impact during Z-axis movement. The Z-axis moving frame 6 serves as the motion carrier and is detachably fixed to the movable sleeve rod 51 through the receiving plate 8, which facilitates component maintenance and replacement and ensures the stability of motion transmission. The limiting plate 9 is fixed to the positioning bracket 2 through the support leg 10 and the mounting block 11, which can limit the lateral displacement of the Z-axis moving frame 6 and facilitate disassembly and assembly. The overall structure achieves stability and safety in the Z-axis direction of movement.

[0040] The top four corners of the Z-axis motion frame 6 are fixed to the receiving plate 8 with screws. The bottom of the Z-axis motion frame 6 is provided with a probe mounting plate 12, and the four corners of the probe mounting plate 12 are fixed to the four corners of the bottom of the Z-axis motion frame 6 with screws.

[0041] Using the above technical solution, the top four corners of the Z-axis motion frame 6 are connected to the support plate 8 by screws, and the bottom four corners are also connected to the probe mounting plate 12 by screws. This connection method is simple to operate and allows the Z-axis motion frame 6, the support plate 8, and the probe mounting plate 12 to be subjected to uniform force, avoiding structural deformation caused by local stress concentration and ensuring connection stability. At the same time, the screw connection facilitates the disassembly, maintenance, or replacement of the support plate 8 and the probe mounting plate 12 in the future, improving the ease of use of the mechanism.

[0042] An annular washer is fitted on the outer top of the telescopic inner rod 52, and the annular washer is located between the upper surface of the top plate 4 and the positioning nut 7.

[0043] Using the above technical solution, the annular washer fitted at the top of the telescopic inner rod 52 is sandwiched between the upper surface of the top plate 4 and the positioning nut 7. This not only disperses the pressure of the positioning nut 7 on the top plate 4 and prevents damage to the top plate, but also enhances the anti-loosening effect of the nut, avoids the nut from loosening due to vibration of the mechanism, and ensures the stable operation of the counterweight telescopic guide rod 5.

[0044] The middle of the receiving plate 8 has a second through hole for the top of the movable sleeve rod 51 to pass through. After the top of the movable sleeve rod 51 passes through the second through hole and moves through the receiving plate 8, a locking nut 14 is threaded on the outer wall. A limiting ring 13 is also fixedly fitted on the outer side of the movable sleeve rod 51. The locking nut 14 and the limiting ring 13 are respectively attached to the upper and lower sides of the receiving plate 8.

[0045] With the above technical solution, after the movable sleeve rod 51 is inserted through the second through hole of the receiving plate 8, the movable sleeve rod 51 can be firmly fixed on the receiving plate 8 by the upper and lower cooperation of the outer limiting ring 13 and the top locking nut 14, so as to avoid displacement during movement; and the movable sleeve rod 51 and the receiving plate 8 adopt the connection method of thread + limiting ring, which is simple to operate, convenient to disassemble and assemble later, and convenient to maintain or replace parts.

[0046] The upper and lower ends of the two positioning brackets 2 are fixedly connected to each other. The Z-axis motion frame 6 moves between the two positioning brackets 2. At least one air float is provided on the side of the positioning brackets 2, the connecting ribs 15 and the limiting plate 9 near the Z-axis motion frame 6.

[0047] The above technical solution, with the connecting rib 15 fixed between the two positioning brackets 2, can enhance the overall stability of the bracket; the air float block of the positioning bracket 2, the connecting rib 15 and the limiting plate 9 near the Z-axis motion frame 6 can reduce the frame's motion resistance, make the motion smoother, reduce component wear, and extend service life.

[0048] Both positioning brackets 2 have stepped grooves 16 on the top of the side furthest from each other, and both sides of the two support plates 3 have vertical folded edges on the adjacent sides, with smooth transitions at the vertical points.

[0049] The bottom of the inner side of the support plate 3 is attached to the side of the stepped groove 16, and the two folded edges wrap around both ends of the stepped groove 16. The bottom of the side of the support plate 3 is fixed to the side wall of the stepped groove 16 by screws.

[0050] Using the above technical solution, the stepped groove 16 at the top of the positioning bracket 2 and the folded edge of the support plate 3 cooperate to quickly position the support plate 3 and facilitate precise assembly; the smooth transition of the folded edge can avoid stress concentration and personnel scratches; and the support plate 3 is detachably connected to the side wall of the stepped groove 16 by screws, which makes it convenient to disassemble and assemble later, and facilitates the maintenance or replacement of the support plate 3 and related components (such as the top plate, counterweight telescopic guide rod).

[0051] A rectangular folded frame 17 is integrally formed at the bottom edge of the top plate 4. The rectangular folded frame 17 is inserted between the two support plates 3 and fixed to the support plates 3 by screws.

[0052] Using the above technical solution, the rectangular folded frame 17 at the bottom of the top plate 4 is inserted between the two support plates 3 and fixed with screws. This can increase the contact area so that the top plate is subjected to more uniform force and reduces deformation, and can also assist the top plate in quick positioning and installation. Moreover, the screw connection method makes it easy to disassemble and assemble the top plate 4 and the support plate 3, which makes the frame of the entire Z-axis motion mechanism easier to disassemble, facilitating later maintenance or component replacement.

[0053] On the inner side of the two support plates 3 near the X-axis moving base 1, there are multiple reinforcing rods 18 fixed in the vertical direction by screws.

[0054] Using the above technical solution, the multiple reinforcing rods 18 fixed between the folded edges of the two support plates 3 can provide stable support for the support plates in the vertical direction, reducing their stress deformation; at the same time, it enhances the overall rigidity of the support plates, avoids the deviation of the Z-axis motion frame 6 due to the deformation of the support plates, ensures measurement accuracy, and also extends the service life of the support plates 3.

[0055] The top of the X-axis moving base 1 is screwed to install a first U-shaped seat 19 with the opening facing upward. A toothed driving synchronous pulley is rotatably installed on the inner side of the first U-shaped seat 19 via a shaft. The bottom of the top plate 4 is fixed to a second U-shaped seat 20 with the opening facing downward via a screw. A toothed driven synchronous pulley is rotatably installed on the inner side of the second U-shaped seat 20 via a shaft. A synchronous toothed belt is installed between the toothed driving synchronous pulley and the toothed driven synchronous pulley for transmission.

[0056] One end of the toothed active synchronous pulley is coaxially fixed to the transmission belt pulley 21. The top of the X-axis moving base 1 is also provided with a drive motor mounting position. The drive motor is installed through the motor mounting position, so that the output shaft of the drive motor is connected to the transmission belt pulley 21.

[0057] A connector 22 is fixedly connected to one side of the receiving plate 8 by a screw, and the connector 22 is fixedly connected to the synchronous toothed belt by a screw.

[0058] Using the above technical solution, the transmission structure provides stable installation and rotational support for the toothed active synchronous pulley and the toothed driven synchronous pulley respectively through the first U-shaped seat 19 on the X-axis moving base 1 and the second U-shaped seat 20 on the top plate 4. Compared with traditional gear transmission or belt transmission, the synchronous toothed belt transmission has the advantages of high transmission accuracy and constant transmission ratio, which can ensure that the rotation of the toothed active synchronous pulley can be accurately transmitted to the toothed driven synchronous pulley. The drive motor drives the toothed active synchronous pulley to rotate through the transmission pulley 21, providing stable power for the Z-axis movement. The setting of the motor mounting position facilitates the installation and maintenance of the drive motor. The receiving plate 8 is fixed to the synchronous toothed belt through the connecting piece 22, so that the linear motion of the synchronous toothed belt can be directly converted into the Z-axis direction motion of the receiving plate 8 and the Z-axis motion frame 6. The transmission path is short and the power loss is small, which can realize the precise control of the Z-axis motion and meet the core requirements of Z-axis motion accuracy in coordinate measuring machine. At the same time, the overall transmission structure is compact and adaptable to the overall frame size of the mechanism, avoiding occupying too much measurement space.

[0059] Working principle:

[0060] The drive motor drives the toothed active synchronous pulley in the first U-shaped seat 19 to rotate via the transmission belt pulley 21 on the X-axis moving base 1. The active synchronous pulley drives the toothed driven synchronous pulley in the second U-shaped seat 20 below the top plate 4 to rotate synchronously via the synchronous toothed belt. When the synchronous toothed belt moves, it drives the receiving plate 8 and the connected Z-axis moving frame 6 to move in the vertical direction via the connecting piece 22. At the same time, the movable sleeve 51 of the counterweight telescopic guide rod 5 moves with the Z-axis moving frame 6, the telescopic inner rod 52 slides relative to the sleeve rod and maintains the counterweight balance through the positioning nut 7, and the air float on the positioning bracket 2, connecting rib plate 15 and limiting plate 9 reduces the frame movement resistance, and finally achieves stable and accurate movement in the Z-axis direction to meet the measurement requirements.

[0061] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A Z-axis movement mechanism for a three-coordinate measuring machine, comprising an X-axis moving base (1), characterized in that, The X-axis moving base (1) has a positioning bracket (2) integrally fixed at both ends of its side. The top of the two positioning brackets (2) is vertically fixed to a support plate (3) by screws, and the two support plates (3) are symmetrically arranged. The top of the two support plates (3) are connected to a top plate (4) by screws, and a counterweight telescopic guide rod (5) is provided between the two support plates (3). The counterweight telescopic guide rod (5) is composed of a movable sleeve rod (51) and a telescopic inner rod (52). The bottom end of the telescopic inner rod (52) is slidably connected to the inside of the movable sleeve rod (51). The bottom end of the top plate (4) is provided with a first through hole for the telescopic inner rod (52) to pass through. After the top end of the telescopic inner rod (52) passes through the first through hole and moves through the top plate (4), a positioning nut (7) is threaded on the outer wall. The movable sleeve (51) is provided with a Z-axis motion frame (6) on its outer side. The Z-axis motion frame (6) is a hollow structure with both ends through. The movable sleeve (51) is located in the middle of the inner side of the Z-axis motion frame (6). The top of the Z-axis motion frame (6) is fixed to a support plate (8) by screws. The top of the movable sleeve (51) passes through the middle of the support plate (8) and is detachably fixed to the support plate (8). The Z-axis motion frame (6) is provided with a limiting plate (9) on the side away from the X-axis moving base (1). Both sides of the limiting plate (9) are fixed with legs (10). The end of the leg (10) away from the limiting plate (9) is integrally fixed with a mounting block (11). The mounting block (11) is fixed to the side of the positioning bracket (2) away from the X-axis moving base (1) by screws.

2. The Z-axis motion mechanism for a coordinate measuring machine according to claim 1, wherein The top four corners of the Z-axis motion frame (6) are fixed to the receiving plate (8) by screws. The bottom of the Z-axis motion frame (6) is provided with a probe mounting plate (12), and the four corners of the probe mounting plate (12) are fixed to the four corners of the bottom of the Z-axis motion frame (6) by screws.

3. The Z-axis motion mechanism for a coordinate measuring machine according to claim 1, wherein The telescopic inner rod (52) is fitted with an annular washer at the top outer side, and the annular washer is located between the upper surface of the top plate (4) and the positioning nut (7).

4. The Z-axis motion mechanism for coordinate measuring machines according to claim 1, characterized in that, The receiving plate (8) has a second through hole in the middle for the top end of the movable sleeve rod (51) to pass through. After the top end of the movable sleeve rod (51) passes through the second through hole and moves through the receiving plate (8), a locking nut (14) is threaded on the outer wall. A limiting ring (13) is also fixedly fitted on the outer side of the movable sleeve rod (51). The locking nut (14) and the limiting ring (13) are respectively attached to the upper and lower sides of the receiving plate (8).

5. The Z-axis motion mechanism for coordinate measuring machines according to claim 1, wherein The two positioning brackets (2) are fixed with connecting ribs (15) on their upper and lower ends on adjacent sides. The Z-axis motion frame (6) moves between the two positioning brackets (2). Each of the positioning brackets (2), connecting ribs (15) and limiting plate (9) is provided with at least one air float on the side of the Z-axis motion frame (6) near the positioning bracket (2), connecting ribs (15) and limiting plate (9).

6. The Z-axis motion mechanism for coordinate measuring machines according to claim 1, wherein The top of each of the two positioning brackets (2) on the opposite side is provided with a stepped groove (16), and the two support plates (3) on the adjacent side are provided with vertical folded edges, and the vertical parts are treated with smooth transition. The bottom end of the inner side of the support plate (3) is attached to the side of the stepped groove (16), and the two folded edges wrap around both ends of the stepped groove (16). The bottom end of the side of the support plate (3) is fixed to the side wall of the stepped groove (16) by screws.

7. The Z-axis motion mechanism for coordinate measuring machines according to claim 1, wherein A rectangular folded frame (17) is integrally formed at the bottom edge of the top plate (4). The rectangular folded frame (17) is inserted between two support plates (3) and fixed to the support plates (3) by screws.

8. The Z-axis motion mechanism for coordinate measuring machines according to claim 6, wherein On the inner side of the two support plates (3) near the X-axis moving base (1), a plurality of reinforcing rods (18) are fixed in the vertical direction by screws.

9. The Z-axis motion mechanism for coordinate measuring machines according to claim 1, wherein The top of the X-axis moving base (1) is fitted with a first U-shaped seat (19) with its opening facing upward by screws. A toothed active synchronous wheel is rotatably mounted on the inner side of the first U-shaped seat (19) by a shaft. The bottom of the top plate (4) is fixed with a second U-shaped seat (20) with its opening facing downward by screws. A toothed driven synchronous wheel is rotatably mounted on the inner side of the second U-shaped seat (20) by a shaft. A synchronous toothed belt is installed between the toothed active synchronous wheel and the toothed driven synchronous wheel. One end of the toothed active synchronous pulley is coaxially fixed to a transmission belt pulley (21), and the top of the X-axis moving base (1) is also provided with a drive motor mounting position. The drive motor is installed through the motor mounting position, so that the output shaft of the drive motor is connected to the transmission belt pulley (21) for transmission. A connector (22) is fixedly connected to one side of the receiving plate (8) by a screw, and the connector (22) is fixedly connected to the synchronous toothed belt by a screw.

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