Flatness measuring structure of gantry machine tool

Abstract

The utility model discloses a planeness measuring structure of a gantry machine tool, which comprises a machine tool body, a processing platform movably arranged on the machine tool body, a door-shaped frame fixed above the machine tool body, milling equipment movably arranged on a cross beam of the door-shaped frame in a lifting manner, and a planeness measuring mechanism arranged on the door-shaped frame, the flatness measuring mechanism comprises a square pipe movably hinged to one side of the door-shaped frame, a first locking assembly for locking the square pipe to be perpendicular and parallel relative to the machining platform, a dial indicator detachably connected to one end of the square pipe, a sleeve fixed to the other end of the square pipe, a circular sliding rod movably connected with the sleeve in an inserted mode, and a square sliding rod sliding in the square pipe. The rotating plate is movably hinged to one end of the circular sliding rod, the second locking assembly locks the rotating plate to rotate and move, and the contact rod is detachably connected with one end of the rotating plate and is parallel to the circular sliding rod. The utility model has the advantages that the dial indicator is convenient to observe, and the measurement precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of gantry machine tool detection tools, in particular to a flatness measurement structure of a gantry machine tool. Background Art

[0002] At present, before a gantry machine tool is put into use, in order to ensure its machining accuracy, it is usually necessary to measure the flatness of the surface of its machining platform. The common flatness measurement method for the existing gantry machine tool machining platform is that a dial indicator is manually installed on the milling equipment of the gantry frame by workers, and then, in cooperation with the cross movement of the machining platform and the milling equipment, the flatness at different positions on the machining platform is measured. However, in the actual measurement process, when the milling equipment moves to the middle of the machining platform, for the workers on both sides of the machining platform, it is not only very inconvenient to observe the value on the dial indicator and the value is prone to observation errors, but also when the dial indicator becomes loose during the measurement, it is impossible to easily adjust and lock the dial indicator. Therefore, the flatness measurement effect of the machining platform is poor and the measurement accuracy is low. Content of the Utility Model

[0003] The purpose of the utility model is to provide a flatness measurement structure of a gantry machine tool, which has the effects of convenient observation of the dial indicator and high measurement accuracy.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions: A flatness measurement structure of a gantry machine tool includes a bed body, a machining platform movably arranged on the bed body, a gantry frame fixed above the bed body, a milling equipment movably and vertically arranged on the cross beam of the gantry frame, and further includes a flatness measurement mechanism. The flatness measurement mechanism includes a square tube movably hinged to one side of the gantry frame, a first locking component for locking the perpendicular and parallel states of the square tube relative to the machining platform, a dial indicator detachably connected to one end of the square tube, a sleeve fixed to the other end of the square tube, a circular slide bar movably inserted into the sleeve, a square slide bar sliding in the square tube, a rotating plate movably hinged to one end of the circular slide bar, a second locking component for locking the rotation of the rotating plate, and a contact rod detachably connected to one end of the rotating plate and parallel to the circular slide bar. The sleeve and the square tube are perpendicular to each other, and one end of the square slide bar slides into the sleeve. Chamfers capable of contacting each other in parallel are respectively arranged at one ends of the circular slide bar and the square slide bar located in the sleeve. The end of the square slide bar far from the circular slide bar is close to the dial indicator, and the measuring end of the dial indicator vertically contacts the end of the square slide bar. One end of the contact rod can vertically contact the surface of the machining platform.

[0005] A further setting of the utility model is that: a support plate is fixedly arranged at one end of the square tube, a hinge shaft rotatably passing through the support plate is fixedly arranged on the side wall of the gantry frame, a limit disc is fixedly arranged at the end of the hinge shaft far from the gantry frame, and one side of the limit disc is in parallel contact with one side of the support plate.

[0006] A further arrangement of the utility model is that a fixing clamp seat one for a dial indicator is screwed on the support plate, and the fixing clamp seat one is perpendicular to the support plate. A clamping hole one for the detection part of the dial indicator to pass through is formed in the middle of the fixing clamp seat one. A gap one penetrating the clamping hole one is formed at the end of the fixing clamp seat one away from the support plate. A bolt one vertically penetrating the gap one is movably inserted into the fixing clamp seat one. A locking nut one is threadedly connected to the bolt one, and the locking nut one and the nut of the bolt one are respectively located on both sides of the fixing clamp seat one.

[0007] A further arrangement of the utility model is that one end of the rotating plate is screwed with a fixing clamp seat two for fixing the contact rod, and the fixing clamp seat two is parallel to the rotating plate. A clamping hole two for the contact rod to vertically pass through is formed in the middle of the fixing clamp seat two. A gap two penetrating the clamping hole two is formed at the end of the fixing clamp seat two away from the rotating plate. A bolt two vertically penetrating the gap two is movably inserted into the fixing clamp seat two. A locking nut two is threadedly connected to the bolt two, and the locking nut two and the nut of the bolt two are respectively located on both sides of the fixing clamp seat two.

[0008] A further arrangement of the utility model is that the diameter of the circular sliding rod is smaller than the inner diameter of the sleeve. Both ends of the sleeve are sealed, and a through hole one only for the circular sliding rod to slide through is formed at one end. A limiting protrusion is fixedly arranged on the side of the circular sliding rod away from the square sliding rod. A sliding limiting groove for the limiting protrusion to slide is formed on the inner wall of the sleeve.

[0009] A further arrangement of the utility model is that one end of the sleeve close to the dial indicator is sealed, and a through hole two only for the detection end of the dial indicator to extend into is formed.

[0010] A further arrangement of the utility model is that the locking component one includes a pair of L-shaped locking plates fixed on the portal frame and a pair of bolts three respectively threadedly connected to the two L-shaped locking plates. The two L-shaped locking plates are perpendicular to each other. When the square tube is in the vertical and horizontal states, it can respectively lie in the gaps between the two L-shaped locking plates and the side wall of the portal frame. The square tube is located between the bolt three and the side wall of the portal frame, and one end of the bolt three vertically contacts the side wall of the square tube.

[0011] A further arrangement of the utility model is that a locking hole for one end of the locking bolt three to insert is formed on the side wall of the square tube.

[0012] A further arrangement of the utility model is that the locking component two includes a locking screw rod fixed at the lower end of the circular sliding rod and a locking nut three threadedly connected to the screw rod. One end of the rotating plate is fixedly connected with a rotating ring one rotatably sleeved on the locking screw rod, and the rotating ring one is located between the end of the circular sliding rod and the locking nut three.

[0013] The utility model is further configured as follows: a circle of annular groove is provided in the middle of the circular slide rod, a second rotating ring is rotatably sleeved in the annular groove, and a support arm is fixedly connected between the second rotating ring and the rotating plate.

[0014] The beneficial effects of the utility model are as follows: by adopting the above technical scheme, when it is necessary to measure the flatness on the processing platform, firstly, the square tube is manually turned over so that the square tube lies horizontally on an L-shaped locking plate, and the bolt three on the L-shaped locking plate is tightened to lock the horizontal position of the square tube, and then the circular sliding rod and the contact rod, which are parallel to each other, are turned over and locked with the square tube, and are vertically located above the surface of the processing platform, and at the same time, the lower end of the contact rod vertically contacts the surface of the processing platform; then, a rod-shaped tool is inserted from the through hole two at one end of the square tube to push the square sliding rod in the square tube to slide, so that the chamfer of the square sliding rod and the chamfer of the circular sliding rod are in close contact; then , pass the inspection part of the dial indicator through the clamp hole 1 and the through hole 2 on the fixed clamp seat 1, and ensure that the detection end of the dial indicator is close to the end of the square slide bar; then, lock the dial indicator on the fixed clamp seat 1 through bolt 1 and locking nut 1, and manually adjust the dial indicator to zero; finally, control the linear movement of the processing platform, and the friction of linear motion will occur between the lower end of the contact rod and the surface of the processing platform. During the linear motion friction process, the tiny height changes generated will be transmitted to the detection end of the dial indicator through the circular slide bar and the square slide bar, causing the pointer on the dial indicator to change, and then indirectly measure the flatness of the processing platform in this way.

[0015] Among them, since the rotating plate that can rotate relative to the circular sliding rod is fixedly connected to the contact rod by means of structures such as a fixed clamp seat 2, a bolt 2 and a locking nut 2, when it is necessary to change the detection position, first loosen the locking nut on the locking screw so that the rotating ring 1 connected to the rotating plate can rotate, and then rotate the hollow rotating plate manually. Finally, when the contact rod reaches the appropriate position of the processing platform, re-tighten the locking nut on the locking screw, so that the measuring position of the processing platform can be simply changed, and the comprehensive measurement of the processing platform can be realized.

[0016] When the measurement work is completed, first turn the bolt one or the locking nut on the fixed clamp seat one to loosen the clamping fixation of the dial indicator on the clamp hole. Then, after removing the dial indicator, turn the bolt three on the side wall of the L-shaped locking plate to release the flip lock of the square tube. Finally, flip the square tube to lie vertically in another L-shaped locking plate, and tighten the bolt three on this L-shaped locking plate at the same time. The square tube, round sliding rod, rotating plate and contact rod can be removed from the surface of the processing table and retained on the side wall of the door-shaped frame for the next inspection work.

[0017] During the flatness measurement process of the above-mentioned processing platform, the dial indicator can be placed on the gantry frame. This not only overcomes the problem that it is difficult to observe the dial indicator in the traditional flatness measurement method, but also, in combination with fixing structures such as the fixing clamp base one, bolt one, and locking nut, can quickly adjust and lock the dial indicator when it becomes loose, thereby effectively ensuring the measurement effect and accuracy of the dial indicator. Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 is the three-dimensional structure schematic diagram of this embodiment;

[0020] Figure 2 is the exploded view of the flatness measurement mechanism of this embodiment;

[0021] Figure 3 is the structural cross-sectional view of the square tube, sleeve, square sliding rod, and circular sliding rod of this embodiment;

[0022] Figure 4 is Figure 2 the enlarged view of part A of

[0023] In the figure, 1. Bed body; 2. Processing platform; 3. Gantry frame; 31. Hinge shaft; 32. Limit disc; 4. Milling equipment; 5. Flatness measurement mechanism; 51. Square tube; 511. Support plate; 512. Through hole two; 513. Locking hole; 52. Locking component one; 521. L-shaped locking plate; 522. Bolt three; 53. Dial indicator; 54. Sleeve; 541. Through hole one; 542. Limit groove; 55. Circular sliding rod; 551. Limit protrusion; 552. Annular groove; 56. Square sliding rod; 57. Rotating plate; 571. Second rotating ring; 572. Support arm; 58. Locking component two; 581. Locking screw; 582. Locking nut three; 583. First rotating ring; 59. Contact rod; 6. Fixing clamp base one; 61. Clamping hole one; 62. Gap one; 63. Bolt one; 64. Locking nut one; 7. Fixing clamp base two; 71. Clamping hole two; 72. Gap two; 73. Bolt two; 74. Locking nut two. Detailed Embodiment

[0024] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0025] Embodiment: A flatness measurement structure of a gantry machine tool, as Figures 1-4 shown, includes a bed body 1, a processing platform 2 movably arranged on the bed body 1, a gantry frame 3 fixed above the bed body 1, a milling device 4 movably and vertically arranged on the cross beam of the gantry frame 3, and a flatness measurement mechanism 5 arranged on the gantry frame 3. The flatness measurement mechanism 5 includes a square tube 51 movably hinged to one side of the gantry frame 3, a first locking component 52 for locking the vertical and parallel states of the square tube 51 relative to the processing platform 2, a dial indicator 53 detachably connected to one end of the square tube 51, a sleeve 54 fixed to the other end of the square tube 51, a circular slide bar 55 movably inserted into the sleeve 54, a square slide bar 56 sliding in the square tube 51, a rotating plate 57 movably hinged to one end of the circular slide bar 55, a second locking component 58 for locking the rotation of the rotating plate 57, and a contact rod 59 detachably connected to one end of the rotating plate 57 and parallel to the circular slide bar 55. The sleeve 54 and the square tube 51 are perpendicular to each other, and one end of the square slide bar 56 slides into the sleeve 54. Chamfers that can be in parallel contact with each other are respectively provided at one ends of the circular slide bar 55 and the square slide bar 56 located in the sleeve 54. One end of the square slide bar 56 away from the circular slide bar 55 is close to the dial indicator 53, and the measuring end of the dial indicator 53 vertically contacts the end of the square slide bar 56. One end of the contact rod 59 can vertically contact the surface of the processing platform 2.

[0026] Further, one end of the square tube 51 is fixedly provided with a support plate 511. A hinge shaft 31 that rotatably passes through the support plate 511 is fixedly provided on the side wall of the portal frame 3. A limit disc 32 is fixedly provided at one end of the hinge shaft 31 away from the portal frame 3, and one side of the limit disc 32 is in parallel contact with one side of the support plate 511. A first fixing clamp base 6 for a dial indicator 53 is screwed to the support plate 511, and the first fixing clamp base 6 and the support plate 511 are perpendicular to each other. A first clamping hole 61 through which the detection part of the dial indicator 53 passes is formed in the middle of the first fixing clamp base 6. A first gap 62 penetrating the first clamping hole 61 is formed at the end of the first fixing clamp base 6 away from the support plate 511. A first bolt 63 vertically passing through the first gap 62 is movably inserted into the first fixing clamp base 6. A first locking nut 64 is threadedly connected to the first bolt 63, and the first locking nut 64 and the nut of the first bolt 63 are respectively located on both sides of the first fixing clamp base 6. By adopting the hinge structures such as the support plate 511, the hinge shaft 31 and the limit disc 32, not only can the stable flipping of the square tube 51 be effectively guaranteed, but also in cooperation with the first fixing clamp base 6, the first bolt 63 and the first locking nut 64, the dial indicator 53 can be stably installed and fixed at one end of the square tube 51.

[0027] Further, one end of the rotating plate 57 is screwed with a second fixing clamp base 7 for fixing the contact rod 59, and the second fixing clamp base 7 and the rotating plate 57 are parallel to each other. A second clamping hole 71 through which the contact rod 59 vertically passes is formed in the middle of the second fixing clamp base 7. A second gap 72 penetrating the second clamping hole 71 is formed at the end of the second fixing clamp base 7 away from the rotating plate 57. A second bolt 73 vertically passing through the second gap 72 is movably inserted into the second fixing clamp base 7. A second locking nut 74 is threadedly connected to the second bolt 73, and the second locking nut 74 and the nut of the second bolt 73 are respectively located on both sides of the second fixing clamp base 7. By adopting the second fixing clamp base 7, the second bolt 73 and the second locking nut 74, not only can the contact rod 59 and the rotating plate 57 be stably fixedly connected, but also the height of the contact rod 59 can be manually adjusted for different height positions on the processing platform 2 to ensure that the contact end of the contact rod 59 fully contacts the surface of the processing platform 2.

[0028] Further, the diameter of the circular slide bar 55 is smaller than the inner diameter of the sleeve 54. Both ends of the sleeve 54 are sealed, and a first through hole 541 through which only the circular slide bar 55 can slide and penetrate is formed at one end. A limit protrusion 551 is fixedly provided on the side of the circular slide bar 55 away from the square slide bar 56. A limit groove 542 for the limit protrusion 551 to slide is formed on the inner wall of the sleeve 54. By adopting the first through hole 541, the limit protrusion 551 and the limit groove 542, not only can the stable sliding of the circular slide bar 55 be guaranteed, but also the sliding range of the circular slide bar 55 can be limited to a certain extent to ensure the stable chamfer contact between the circular slide bar 55 and the square slide bar 56.

[0029] Furthermore, the sleeve 54 is sealed at one end close to the dial gauge 53, and is provided with a second through hole 512 for only the detection end of the dial gauge 53 to extend into. By adopting the second through hole 512, not only can the square tube 51 be prevented from having one end of the square slide bar 56 fall out of the square tube 51 when the square tube 51 is vertical, but also the second through hole 512 can provide positioning support for the detection part of the dial gauge 53 during measurement, thereby further ensuring the measurement accuracy of the dial gauge 53.

[0030] Furthermore, the locking assembly 1 52 includes a pair of L-shaped locking plates 521 fixed on the door-shaped frame 3, and a pair of bolts 3 522 respectively threadedly connected to the two L-shaped locking plates 521. The two L-shaped locking plates 521 are perpendicular to each other, and when the square tube 51 is in a vertical and horizontal state, it can lie in the gap between the two L-shaped locking plates 521 and the side wall of the door-shaped frame 3, respectively. The square tube 51 is located between the bolts 3 522 and the side wall of the door-shaped frame 3, and one end of the bolts 3 522 vertically contacts the side wall of the square tube 51. Among them, the side wall of the square tube 51 is provided with a locking hole 513 for inserting one end of the locking bolt 3 522, which can further improve the locking stability of the square tube 51.

[0031] Furthermore, the locking assembly 2 58 includes a locking screw 581 fixed to the lower end of the circular slide bar 55, a locking nut 3 582 threadedly connected to the screw, and a rotating ring 1 583 rotatably sleeved on the locking screw 581 is fixedly connected to one end of the rotating plate 57, and the rotating ring 1 583 is located between the end of the circular slide bar 55 and the locking nut 3 582. Among them, a circle of annular grooves 552 are provided in the middle of the circular slide bar 55, and a rotating ring 2 571 is rotatably sleeved in the annular groove 552. A support arm 572 is fixedly connected between the rotating ring 2 571 and the rotating plate 57, which can not only improve the rotation stability of the rotating plate 57, but also enhance the rigidity of the rotating plate 57 to ensure that the rotating plate 57 stably transmits the slight height change of the contact rod 59 to the circular slide bar 55.

[0032] The working principle of this embodiment:

[0033] When it is necessary to measure the flatness of the processing platform 2, first manually flip the square tube 51 so that the square tube 51 lies horizontally on an L-shaped locking plate 521, and tighten the bolt 3 522 on the L-shaped locking plate 521 to lock the horizontal position of the square tube 51. Then, the circular slide bar 55 and the contact rod 59, which are parallel to each other, will flip and lock with the square tube 51, and be vertically located above the surface of the processing platform 2. At the same time, the lower end of the contact rod 59 will vertically contact the surface of the processing platform 2; then, use a rod-shaped tool to insert it from the through hole 2 512 at one end of the square tube 51, so as to push the square slide bar 56 in the square tube 51 to slide, so that the chamfer of the square slide bar 56 and the chamfer of the circular slide bar 55 are in close contact; then, the dial indicator 53 is The inspection part passes through the clamp hole 1 61 and the through hole 2 512 on the fixed clamp seat 1 6, and ensures that the detection end of the dial indicator 53 is close to the end of the square slide bar 56; then, the dial indicator 53 is locked and fixed on the fixed clamp seat 1 6 by means of a bolt 1 63 and a locking nut 1, and the dial indicator 53 is manually adjusted to zero; finally, the processing platform 2 is controlled to move linearly, and linear motion friction will occur between the lower end of the contact rod 59 and the surface of the processing platform 2. During the linear motion friction process, the slight height change generated will also be transmitted to the detection end of the dial indicator 53 through the circular slide bar 55 and the square slide bar 56, causing the pointer on the dial indicator 53 to change, and then the flatness of the processing platform 2 is indirectly measured in this way.

[0034] Among them, since the rotating plate 57 can rotate relative to the circular sliding rod 55, the contact rod 59 is fixedly connected by the fixed clamp seat 27, the bolt 273 and the locking nut 2. Therefore, when it is necessary to change the detection position, first loosen the locking nut on the locking screw 581 to allow the rotating ring 1 583 connected to the rotating plate 57 to rotate, and then manually rotate the hollow rotating plate 57. Finally, when the contact rod 59 reaches the appropriate position of the processing platform 2, re-tighten the locking nut on the locking screw, so that the measurement position of the processing platform 2 can be simply changed, and the comprehensive measurement of the processing platform 2 can be realized.

[0035] When the measurement work is completed, firstly, screw the bolt 63 or the locking nut on the fixing clamp seat 6 to loosen the clamping hole 61 that clamps the dial indicator 53. Then, after removing the dial indicator 53, screw the bolt 522 on the side wall of the L-shaped locking plate 521 to release the flip lock of the square tube 51. Finally, flip the square tube 51 to lie vertically in another L-shaped locking plate 521, and tighten the bolt 522 on the L-shaped locking plate 521 at the same time. Then, the square tube 51, the circular sliding rod 55, the rotating plate 57 and the contact rod 59 can be separated from the surface of the processing table and retained on the side wall of the door-shaped frame 3 for the next inspection work.

[0036] In the process of measuring the flatness of the above-mentioned processing platform 2, the dial indicator 53 can always be placed on the portal frame 3. This can not only overcome the problem that it is difficult to observe the dial indicator 53 in the traditional flatness measurement method, but also, in combination with the fixing structures such as the fixed clamp base 1, bolt 13, and lock nut, can quickly adjust and lock the dial indicator 53 when it becomes loose, thereby effectively ensuring the measurement effect and measurement accuracy of the dial indicator 53.

Claims

1. A flatness measuring structure for a gantry machine tool, comprising a bed (1), a processing platform (2) movably arranged on the bed (1), a door-shaped frame (3) fixed above the bed (1), and a milling device (4) movably and hoistably arranged on a crossbeam of the door-shaped frame (3), characterized in that: The flatness measuring mechanism (5) comprises a square tube (51) on one side of a movable hinged door-shaped frame (3), a locking assembly (52) for locking the square tube (51) in a vertical and parallel state relative to the processing platform (2), a dial indicator (53) detachably connected to one end of the square tube (51), a sleeve (54) fixed to the other end of the square tube (51), a circular slide bar (55) movably inserted into the sleeve (54), a square slide bar (56) sliding in the square tube (51), a rotating plate (57) at one end of the movable hinged circular slide bar (55), and a locking assembly (58) for locking the rotating plate (57) to rotate. A contact rod (59) is detachably connected to one end of the rotating plate (57) and is parallel to the circular slide rod (55); the sleeve (54) and the square tube (51) are perpendicular to each other, and one end of the square slide rod (56) slides into the sleeve (54); one end of the circular slide rod (55) and the square slide rod (56) located in the sleeve (54) are respectively provided with chamfers that can contact each other in parallel; one end of the square slide rod (56) away from the circular slide rod (55) is close to the dial indicator (53), and the measuring end of the dial indicator (53) vertically contacts the end of the square slide rod (56); one end of the contact rod (59) can vertically contact the surface of the processing platform (2).

2. The flatness measurement structure of a gantry machine tool according to claim 1, characterized in that: A support plate (511) is fixedly provided at one end of the square tube (51), a hinge shaft (31) that rotates and passes through the support plate (511) is fixedly provided on the side wall of the door-shaped frame (3), and a limiting disc (32) is fixedly provided at one end of the hinge shaft (31) away from the door-shaped frame (3), and one side of the limiting disc (32) is in parallel contact with one side of the support plate (511).

3. The flatness measurement structure of a gantry machine tool according to claim 2, characterized in that: A fixing clamp seat (6) for a dial indicator (53) is screwed to the support plate (511), and the fixing clamp seat (6) and the support plate (511) are perpendicular to each other. A clamp hole (61) is provided in the middle of the fixing clamp seat (6) for the detection part of the dial indicator (53) to pass through. A gap (62) penetrating the clamp hole (61) is provided at the end of the fixing clamp seat (6) away from the support plate (511). A bolt (63) vertically passing through the gap (62) is movably inserted into the fixing clamp seat (6). A locking nut (64) is threadedly connected to the bolt (63), and the nuts of the locking nut (64) and the bolt (63) are respectively located on two sides of the fixing clamp seat (6).

4. The flatness measurement structure of a gantry machine tool according to claim 1, characterized in that: One end of the rotating plate (57) is screw-connected with a second fixing clamp seat (7) for fixing the contact rod (59), and the second fixing clamp seat (7) and the rotating plate (57) are parallel to each other. A second clamp hole (71) for the contact rod (59) to vertically pass through is provided in the middle of the second fixing clamp seat (7), and a second gap (72) passing through the second clamp hole (71) is provided at the end of the second fixing clamp seat (7) away from the rotating plate (57). A second bolt (73) vertically passing through the second gap (72) is movably inserted into the second fixing clamp seat (7), and a second locking nut (74) is threadedly connected to the second bolt (73), and the nuts of the second locking nut (74) and the second bolt (73) are respectively located on two sides of the second fixing clamp seat (7).

5. The flatness measurement structure of a gantry machine tool according to claim 1, characterized in that: The diameter of the circular sliding rod (55) is smaller than the inner diameter of the sleeve (54). Both ends of the sleeve (54) are sealed, and one end is provided with a through hole (541) for the circular sliding rod (55) to slide through. A limiting protrusion (551) is fixedly provided on the side of the circular sliding rod (55) away from the square sliding rod (56), and the inner wall of the sleeve (54) is provided with a limiting groove (542) for the limiting protrusion (551) to slide.

6. The flatness measurement structure of a gantry machine tool according to claim 1, characterized in that: The sleeve (54) is sealed at one end close to the dial gauge (53), and is provided with a second through hole (512) for only the detection end of the dial gauge (53) to extend into.

7. The flatness measurement structure of a gantry machine tool according to claim 1, characterized in that: The locking assembly (52) comprises a pair of L-shaped locking plates (521) fixed on the door-shaped frame (3), and a pair of bolts (522) respectively threadedly connected to the two L-shaped locking plates (521). The two L-shaped locking plates (521) are perpendicular to each other, and when the square tube (51) is in a vertical and horizontal state, it can lie in the gap between the two L-shaped locking plates (521) and the side wall of the door-shaped frame (3). The square tube (51) is located between the bolts (522) and the side wall of the door-shaped frame (3), and one end of the bolts (522) vertically contacts the side wall of the square tube (51).

8. The flatness measurement structure of a gantry machine tool according to claim 7, characterized in that: The side wall of the square tube (51) is provided with a locking hole (513) for inserting one end of a locking bolt three (522).

9. The flatness measurement structure of a gantry machine tool according to claim 1, characterized in that: The locking assembly 2 (58) comprises a locking screw (581) fixed to the lower end of the circular slide rod (55) and a locking nut 3 (582) threadedly connected to the screw. One end of the rotating plate (57) is fixedly connected to a rotating ring 1 (583) rotatably sleeved on the locking screw (581), and the rotating ring 1 (583) is located between the end of the circular slide rod (55) and the locking nut 3 (582).

10. The flatness measurement structure of a gantry machine tool according to claim 1, characterized in that: A circular groove (552) is provided in the middle of the circular sliding rod (55), a second rotating ring (571) is rotatably sleeved in the circular groove (552), and a support arm (572) is fixedly connected between the second rotating ring (571) and the rotating plate (57).

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